| 谷本 潤（たにもと じゅん） | データ更新日：2024.04.01 |
教授 ／
総合理工学研究院
環境理工学部門
| 1. | 木村 建一, 田辺 新一, 門谷 〓一, 大西 徹夫, 田宮 建司, 谷本 潤, 渡辺 睦典, B-19 改良型熱電冷却パネルの体感効果に関する実験研究, 学術講演会論文集, 10.18948/shasetaikai.1989.0_329, 329-332, 1989.10. |
| 2. | Yuichi Tatsukawa, Md. Rajib Arefin, Kazuki Kuga, Jun Tanimoto, An agent-based nested model integrating within-host and between-host mechanisms to predict an epidemic, PLOS ONE, 10.1371/journal.pone.0295954, 18, 12, e0295954-e0295954, 2023.12, The COVID-19 pandemic has remarkably heightened concerns regarding the prediction of communicable disease spread. This study introduces an innovative agent-based modeling approach. In this model, the quantification of human-to-human transmission aligns with the dynamic variations in the viral load within an individual, termed “within-host” and adheres to the susceptible–infected–recovered (SIR) process, referred to as “between-host.” Variations in the viral load over time affect the infectivity between individual agents. This model diverges from the traditional SIR model, which employs a constant transmission probability, by incorporating a dynamic, time-dependent transmission probability influenced by the viral load in a host agent. The proposed model retains the time-integrated transmission probability characteristic of the conventional SIR model. As observed in this model, the overall epidemic size remains consistent with the predictions of the standard SIR model. Nonetheless, compared to predictions based on the classical SIR process, notable differences existed in the peak number of the infected individuals and the timing of this peak. These nontrivial differences are induced by the direct correlation between the time-evolving transmission probability and the viral load within a host agent. The developed model can inform targeted intervention strategies and public health policies by providing detailed insights into disease spread dynamics, crucial for effectively managing epidemics.. |
| 3. | Kohei Miyaji, Zhen Wang, Jun Tanimoto, Aya Hagishima, Satoshi Kokubo, The evolution of fairness in the coevolutionary ultimatum games, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2013.05.007, 56, 13-18, 2013.11, In the ultimatum games, two players are required to split a certain sum of money. Through the responder accepting the offer of proposer, the money will be shared and the fairness is built finally. Here, we figure out five coevolutionary protocols, where strategy (offering rate p and threshold for accepting an offer q) and underlying network topology can coevolve, to demonstrate how the link severing scenario affects the evolution of fairness. We show that the equilibrium of the games is significantly influenced by these coevolutionary protocols. The deterministic rules lead to overly lavish or overly generous result that is inconsistent with the outcome of human behavior experiment. However, the probabilistic rules produce fair division, similar to the realistic case. Moreover, we also introduce an amplitude parameter b to verify the plausibility of assumed link severing protocols. By means of enhancing b we analytically exhibit that preferable performance can be obtained in the game, since the total amount of agents increases as well. Last, we further support our conclusion by showing the so-called unrealistic severing events under these coevolution scenarios. We thus present a viable way of understanding the ubiquitous fairness in nature and hope that it will inspire further studies to resolve social division. © 2013 Elsevier Ltd. All rights reserved.. |
| 4. | Sheikh Ahmad Zaki, Aya Hagishima, Jun Tanimoto, Ahmad Faiz Mohammad, Azli Abd Razak, ESTIMATION OF AERODYNAMIC PARAMETERS OF URBAN BUILDING ARRAYS USING WIND TUNNEL MEASUREMENTS, JOURNAL OF ENGINEERING SCIENCE AND TECHNOLOGY, 9, 2, 176-190, 2014.04, The aim of this study is the experimental determination of a centre height of moment of drag force Hc, which is assumed to coincide with displacement height d on the basis of Jackson's theory. The authors performed a series of wind tunnel experiments on the spatial distribution of pressure drag acting on walls of rectangular block arrays arranged in staggered, square, and diamond layouts under the conditions of different roughness packing densities, i.e., 7.7%, 17.4%, 30.9%, and 39.1%. Total drag and wind profile of the arrays were preliminarily measured by a floating drag balance and a hot-wire anemometer, and roughness length zo and d were derived using two-parameter fitting in our previous work. Hc values determined by the pressure drag measurement were compared with d of our previous work. The results show that the estimated Hc values for staggered and square arrays are significantly smaller than d except for the data of lowest packing density. Moreover, the zo values estimated using one-parameter fitting and measured Hc are slightly larger than those of previous work for the three arrays with high packing density. Although inconsistencies of Hc and d exist, it is likely that Hc could be explained as d for a range of low packing densities, i.e., below 30.9%. The present results suggest the necessity of both more accurate data of spatially averaged wind profile and direct measurement of Hc for experimental determination of the roughness length and displacement height of a block array. © School of Engineering, Taylor's University.. |
| 5. | K. M. Ariful Kabir, Jun Tanimoto, Vaccination strategies in a two-layer SIR/V-UA epidemic model with costly information and buzz effect, COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION, 10.1016/j.cnsns.2019.04.007, 76, 92-108, 2019.09, The promptness with which individuals respond to information has an important effect on the spread of epidemics. To study this effect, we establish a two-layer SIR/V epidemic model that incorporates the effects of information buzz and information costs in the framework of a vaccination game. Previous studies on this issue have generally assumed that only unaware people can become aware, and the relative vaccination cost is used to update their strategies for avoiding infection. Firstly, we introduce the idea that aware people can also become unaware because of a wicked rumor about a beneficial practice. Secondly, the relative cost of information is modeled for individual update strategies in a novel way of framing a game by introducing a two-strategy and 2 (information state A/UA) by 2(healthy/infected) state game, referred to as a two-under-two game. In this framework, susceptible, infected, and vaccinated individuals are divided into two states as unaware and aware, and recovered individuals are assumed to be aware, for an unbounded and well-mixed population. Information about wearing masks or taking other protection against diseases spreads locally for a season, and this information has a significant tendency to reduce the extent of contagious disease that persists through each generation of the model. Mathematical analysis shows that funds spent on awareness can reduce the vaccination cost and improve the epidemic threshold under certain conditions. (C) 2019 Elsevier B.V. All rights reserved.. |
| 6. | K. M. Ariful Kabir, Jun Tanimoto, Modelling and analysing the coexistence of dual dilemmas in the proactive vaccination game and retroactive treatment game in epidemic viral dynamics, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 10.1098/rspa.2019.0484, 475, 2232, 2019.12, The dynamics of a spreadable disease are largely governed by four factors: proactive vaccination, retroactive treatment, individual decisions, and the prescribing behaviour of physicians. Under the imposed vaccination policy and antiviral treatment in society, complex factors (costs and expected effects of the vaccines and treatments, and fear of being infected) trigger an emulous situation in which individuals avoid infection by the pre-emptive or ex post provision. Aside from the established voluntary vaccination game, we propose a treatment game model associated with the resistance evolution of antiviral/antibiotic overuse. Moreover, the imperfectness of vaccinations has inevitably led to anti-vaccine behaviour, necessitating a proactive treatment policy. However, under the excessively heavy implementation of treatments such as antiviral medicine, resistant strains emerge. The model explicitly exhibits a dual social dilemma situation, in which the treatment behaviour changes on a local time scale, and the vaccination uptake later evolves on a global time scale. The impact of resistance evolution and the coexistence of dual dilemmas are investigated by the control reproduction number and the social efficiency deficit, respectively. Our investigation might elucidate the substantial impacts of both vaccination and treatment in the framework of epidemic dynamics, and hence suggest the appropriate use of antiviral treatment.. |
| 7. | Md. Rajib Arefin, Tanaka Masaki, K. M. Ariful Kabir, Jun Tanimoto, Interplay between cost and effectiveness in influenza vaccine uptake: a vaccination game approach, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 10.1098/rspa.2019.0608, 475, 2232, 2019.12, Pre-emptive vaccination is regarded as one of the most protective measures to control influenza outbreak. There are mainly two types of influenza viruses-influenza A and B with several subtypes-that are commonly found to circulate among humans. The traditional trivalent (TIV) flu vaccine targets two strains of influenza A and one strain of influenza B. The quadrivalent (QIV) vaccine targets one extra B virus strain that ensures better protection against influenza; however, the use of QIV vaccine can be costly, hence impose an extra financial burden to society. This scenario might create a dilemma in choosing vaccine types at the individual level. This article endeavours to explain such a dilemma through the framework of a vaccination game, where individuals can opt for one of the three options: choose either of QIV or TIV vaccine or none. Our approach presumes a mean-field framework of a vaccination game in an infinite and well-mixed population, entangling the disease spreading process of influenza with the coevolution of two types of vaccination decision-making processes taking place before an epidemic season. We conduct a series of numerical simulations as an attempt to illustrate different scenarios. The framework has been validated by the so-called multi-agent simulation (MAS) approach.. |
| 8. | Jun Tanimoto, Xie An, Improvement of traffic flux with introduction of a new lane-change protocol supported by Intelligent Traffic System, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2019.03.007, 122, 1-5, 2019.05, A new Cellular Automata traffic model based on Revised S-NFS model was established, which considers traffic density ahead of a car in next 50 [m] and also accounts for a decision making process of whether a lane change should be tried or not so as to diminish the frequency of meaningless lane-changes. It intends to be applied as one of the protocols to improve traffic efficiency in premise with Intelligence Traffic System (ITS) that is able to provide information on traffic density next hundred meters in front of a focal vehicle. A series of systematic simulations reveals that the presented lane changing protocol enhances traffic flux vis-a-vis the conventional lane change rule based on the traditional incentive criterion and safe criterion. Social dilemma analysis suggests our new protocol mitigates a strong social dilemma encouraged by a competition between a cooperator; not intending any lane-changes and a defector; trying to lane-changes to minimize his own travel time. (C) 2019 Elsevier Ltd. All rights reserved.. |
| 9. | K. M. Ariful Kabir, Jun Tanimoto, Dynamical behaviors for vaccination can suppress infectious disease - A game theoretical approach, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2019.04.010, 123, 229-239, 2019.06, To avoid the infection, the epidemic outburst plays a significant role that encourages people to take vaccination and induce behavioral changes. The interplay between disease incidence, vaccine uptake and the behavior of individuals are taking place on the local time scale. Here, we analyze the individual's behavior in disease-vaccination interaction model based on the evolutionary game approach that captures the idea of vaccination decisions on disease prevalence that also include social learning. The effect of herd immunity is partly important when the individuals are deciding whether to take the vaccine or not. The possibility that an individual taking a vaccination or becoming infected depends upon how many other people are vaccinated. To apprehend this interplay, four strategy updating rules: individual based risk assessment (IB-RA), society based risk assessment (SB-RA), direct commitment (DC) and modified replicator dynamics (MRD) are contemplated for game theoretical approach by how one individual can learn from society or neighbors. The theory and findings of this paper provide a new perspective for vaccination taking policy in daily basis that provision of prompt learning with the collective information reliefs to reduce infection, which gives a new 'vaccination game' from other previous models. (C) 2019 Elsevier Ltd. All rights reserved.. |
| 10. | K. M. Ariful Kabir, Marko Jusup, Jun Tanimoto, Behavioral incentives in a vaccination-dilemma setting with optional treatment, PHYSICAL REVIEW E, 10.1103/PhysRevE.100.062402, 100, 6, 2019.12, Social dilemmas are situations wherein individuals choose between selfish interest and common good. One example of this is the vaccination dilemma, in which an individual who vaccinates at a cost protects not only himself but also others by helping maintain a common good called herd immunity. There is, however, a strong incentive to forgo vaccination, thus avoiding the associated cost, all the while enjoying the protection of herd immunity. To analyze behavioral incentives in a vaccination-dilemma setting in which an optional treatment is available to infected individuals, we combined epidemiological and game-theoretic methodologies by coupling a disease-spreading model with treatment and an evolutionary decision-making model. Extensive numerical simulations show that vaccine characteristics are more important in controlling the treatment adoption than the cost of treatment itself. The main effect of the latter is that expensive treatment incentivizes vaccination, which somewhat surprisingly comes at a little cost to society. More surprising is that the margin for a true synergy between vaccine and treatment in reducing the final epidemic size is very small. We furthermore find that society-centered decision making helps protect herd immunity relative to individual-centered decision making, but the latter may be better in establishing a novel vaccine. These results point to useful policy recommendations as well as to intriguing future research directions.. |
| 11. | Keisuke Nagashima, Jun Tanimoto, A stochastic Pairwise Fermi rule modified by utilizing the average in payoff differences of neighbors leads to increased network reciprocity in spatial prisoner's dilemma games, APPLIED MATHEMATICS AND COMPUTATION, 10.1016/j.amc.2019.05.034, 361, 661-669, 2019.11, In a 2 x 2 prisoner's dilemma (PD) game, network reciprocity is one of the mechanisms for increasing social viscosity, which leads to a cooperative equilibrium. The Pairwise Fermi (PW-Fermi) rule has been accepted as an updating protocol, as its stochasticity is similar to the real-world human decision-making process. In this paper, we elucidated a modification to the PW-Fermi rule by utilizing the averaged payoff difference instead of the simple payoff difference between a focal agent and their neighbors. This led to a significantly enhanced level of network reciprocity. The mechanism of this enhancement is clarified by discussing the concepts of the enduring period (END) and the expanding period (EXP). (C) 2019 Elsevier Inc. All rights reserved.. |
| 12. | Muntasir Alam, Masaki Tanaka, Jun Tanimoto, A game theoretic approach to discuss the positive secondary effect of vaccination scheme in an infinite and well-mixed population, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2019.05.031, 125, 201-213, 2019.08, Pre-emptive vaccination policy used in controlling the rapid spreading of infectious diseases is considered as one of the most challenging issues imposed to mankind, causing enormous death tolls over the years. This paper dedicatedly studies the dilemma effect coming from the failure of getting perfect immunity to those individuals who committed vaccination earlier. Therefore, we propose a new theoretical model that slows down the infection spreading and also facilitates quicker recovery time than what the previous model does even if a vaccinator fails to obtain perfect immunity. We name this effect as the "positive secondary effect" of vaccination as it gives a second chance to the vaccinators which in return subdues the rapid spreading that helps in producing better social average payoff as well as keeping the final epidemic size smaller. Moreover, to address the positive secondary effect more precisely, we introduce two different parameters; namely, relaxation parameter (eta) and foster parameter (delta) in two different directions to quantify the individual effects resulting from each of the parameter space as well as their superposition effect. An in-depth discussion focuses on the influential role played by our proposed model via discounting and faster recovery effects while a second chance is given to the vaccinators. In addition, we also examine the situation when discounting effect brought by eta outperforms very much than its faster recovery controlled by delta as well as the superposition effects. Unlike all previous studies dealing with vaccination game, we pay much attention to investigating the secondary effect of imperfect vaccination policy. Our proposed theoretical scheme completely reproduces the decision-making process of choosing an imperfect provision based on evolutionary game theory entailed with the widely used SIR (Susceptible-Infected-Recovered) epidemic model. Without considering any spatial structure and perfect vaccination policy, our model presumes the population being infinite and well-mixed to represent the infection spreading dynamics mathematically. This study is conducted throughout using the so-called theoretical approach. Besides that, three different updating rules based on evolutionary game theory have also been considered to investigate all possible situations. Later on, we draw 2D full phase diagrams showing the final epidemic size, vaccination coverage, and average social payoff quantitatively. Finally, our theoretical result is compared with the counterpart result obtained from the multi-agent simulation (MAS) approach and a good agreement is found, hence the appropriateness of the proposed model is fully justified. (C) 2019 Elsevier Ltd. All rights reserved.. |
| 13. | M. D. Ahsan Habib, K. M. Ariful Kabir, Jun Tanimoto, “Do humans play according to the game theory when facing the social dilemma situation?” A survey study, Evergreen, 10.5109/2740936, 7, 1, 7-14, 2020.03, The aim of this study is to verify whether a human can detect the social dilemma class and its strength for four various games: Prisoner’s dilemma, Trivial, Chicken, and Stag-Hunt by using a web-based structural cross-sectional survey. We considered respondent’s cooperative and defective behavior by designing multiple sets of 2 × 2 games for two classes in terms of game opponents: whether he is an intimate friend or an unknown person in the questionnaire. In total, 375 respondents participated in this survey. We found that Prisoner’s dilemma and Trivial game are recognized easily by the respondents, but they are not aware of the dilemma strength and difference of game opponent’s attribute whether the opponent is a close or unknown person.. |
| 14. | Md. Rajib Arefin, Tanaka Masaki, Jun Tanimoto, Vaccinating behaviour guided by imitation and aspiration, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 10.1098/rspa.2020.0327, 476, 2239, 2020.07, Vaccinating decisions can be influenced by imitation as well as self-evaluation or aspiration. This work analyses vaccinating behaviours by coupling both imitation and aspiration update rules, adopting an existing set-up of the mean-field vaccination game. We incorporate the imitation mechanism with several variants of the aspiration protocol, encompassing constant and adaptive aspirations. Equations of the combined dynamics have been derived by grouping the population according to (i) vaccinating strategies and (ii) healthy and infected status within each strategy. If aspiration levels are fixed but differentiated by vaccinating strategies, then vaccinators aspiring less than non-vaccinators are found to ameliorate the vaccination coverage, thereby yielding a less infectious state. The adaptive aspirations maintain a positive correlation with the vaccine efficacy while keeping the opposite relation with vaccination cost. When vaccinating strategies, aspirations and update rules are allowed to evolve synchronously, then either the imitation or aspiration process takes over the entire population. If aspiration rules prevail, then vaccinees and non-vaccinees coexist equally (according to (i)) or vaccine uptake follows a non-monotonic trend with the efficacy (according to (ii)). The imitative rule performs better when vaccination is less expensive or cheap, while aspiration updating safeguards the tenacity of vaccinees despite vaccination being expensive.. |
| 15. | K. M. Ariful Kabir, Jun Tanimoto, The role of advanced and late provisions in a co-evolutionary epidemic game model for assessing the social triple-dilemma aspect, JOURNAL OF THEORETICAL BIOLOGY, 10.1016/j.jtbi.2020.110399, 503, 2020.10, In the context of voluntary vaccination, we consider two additional provisions as well as pre-emptive vaccination for a unified model over epidemiology and evolutionary game theory to assess the extent to which advanced and late provisions restrict the spread of disease. To circumvent infection, people can be vaccinated pre-emptively before the epidemic season, but the imperfectness of vaccination or an unwillingness to be vaccinated may cause people instead to either be late-vaccinated or use self-protection. Here, self-protection corresponds to actions such as wearing a mask, washing hands, or using a mosquito net and is defined as the third strategy after pre-emptive vaccination (the first strategy) and late-vaccination (the second strategy). Our model can reproduce multiple social dilemma situations resulting from what is known as the vaccination dilemma (originating from preemptive vaccination), which works on a global time scale (i.e., repeated seasons approaching social equilibrium), and also from two other dilemmas due to late provisions, which work on a local time scale (i.e., every time step in a single season). To reproduce how an individual can acquire information for adaptation from neighbors or the society for a suitable provision, we introduce several strategy-updating rules for both global and local time scales and this behavioral feedback has a significant effect to reducing a transmissible disease. We also establish the social efficiency deficit (SED) indicator for a triple-dilemma game to quantify the existence of a social dilemma. Relying fully on a theoretical framework, our model provides a new perspective for evaluations: (i) how much more advantageous and effective pre-emptive vaccination is in eradicating a communicable disease compared with late provisions such as late vaccination and selfprotection, and (ii) the extent of the social dilemma resulting from each of the three provisions, given the new idea of SED. The main effect of the triple-dilemma is that expensive provision displays no SED (no dilemma) until the efficiency or effectiveness of provisions reaches a certain level. (C) 2020 Elsevier Ltd. All rights reserved.. |
| 16. | Hiromu Ito, Jun Tanimoto, Scaling the phase-planes of social dilemma strengths shows game-class changes in the five rules governing the evolution of cooperation (vol 5, 181085, 2018), ROYAL SOCIETY OPEN SCIENCE, 10.1098/rsos.200943, 7, 6, 2020.06, In this work, by drawing a RAD-GID phase-plane diagram for pair-wise games, we prove that these five rules are indeed quite different for the resolution (relaxation) of the two dilemmas.. |
| 17. | Masaki Tanaka, Jun Tanimoto, Is subsidizing vaccination with hub agent priority policy really meaningful to suppress disease spreading?, JOURNAL OF THEORETICAL BIOLOGY, 10.1016/j.jtbi.2019.110059, 486, 2020.02, A Multi Agent Simulation (MAS) model that joins evolutionary game theory with epidemiological dynamics is established. Various subsidy policies that encourage vaccination are evaluated quantitatively with the model. The underlying social network topology is based on a scale-free network. Individual subsidies for vaccinations can be directed to hub agents with priority, to efficiently suppress the overall social cost of a vaccination program. These hub agents are more likely to spread both knowledge about vaccination and the disease in question. Our comprehensive simulations showed that this intuitively appealing strategy cannot be effective if the vaccination cost is low and the vaccination budget is small. Thus, we find that the hub agent priority strategy is not always effective. (C) 2019 Elsevier Ltd. All rights reserved.. |
| 18. | Md. Ahsan Habib, Masaki Tanaka, Jun Tanimoto, How does conformity promote the enhancement of cooperation in the network reciprocity in spatial prisoner's dilemma games?, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2020.109997, 138, 2020.09, In line with more enhanced network reciprocity, we built a new spatial prisoner's dilemma (SPD) game considering conformity with presumption of lattice for underlying network and pairwise Fermi (PW-Fermi) for update rule. The key protocol is that a neighbor with more weight resulting from the conformity would be more likely selected as a pairwise opponent in the PW-Fermi updating process instead of random selection the conventional model presuming. A series of systematic simulations confirms that our model realizes more enhanced network reciprocity than the conventional SPD model. We elucidated its mechanism by means of considering on the concept of END period (meaning an initial period in which the global-cooperation fraction decreases from its initial value) and EXP periods (meaning the period following to END period in which global-cooperation increases) that substantially explaining how cooperative clusters survive in initial period and extend to defective zones afterwards. (C) 2020 Elsevier Ltd. All rights reserved.. |
| 19. | K. M. Ariful Kabir, Jun Tanimoto, Evolutionary game theory modelling to represent the behavioural dynamics of economic shutdowns and shield immunity in the COVID-19 pandemic, ROYAL SOCIETY OPEN SCIENCE, 10.1098/rsos.201095, 7, 9, 2020.09, The unprecedented global spread of COVID-19 has prompted dramatic public-health measures like strict stay-at-home orders and economic shutdowns. Some governments have resisted such measures in the hope that naturally acquired shield immunity could slow the spread of the virus. In the absence of empirical data about the effectiveness of these measures, policymakers must turn to epidemiological modelling to evaluate options for responding to the pandemic. This paper combines compartmental epidemiological models with the concept of behavioural dynamics from evolutionary game theory (EGT). This innovation allows us to model how compliance with an economic lockdown might wane over time, as individuals weigh the risk of infection against the certainty of the economic cost of staying at home. Governments can, however, increase spending on social programmes to mitigate the cost of a shutdown. Numerical analysis of our model suggests that emergency-relief funds spent at the individual level are effective in reducing the duration and overall economic cost of a pandemic. We also find that shield immunity takes hold in a population most easily when a lockdown is enacted with relatively low costs to the individual. Our qualitative analysis of a complex model provides evidence that the effects of shield immunity and economic shutdowns are complementary, such that governments should pursue them in tandem.. |
| 20. | Yoshiro Iwamura, Keisuke Nagashima, Jun Tanimoto, Evolutionary dynamics of a 3-strategy game: Cooperator, defector and costly cooperative loner strategic types, APPLIED MATHEMATICS AND COMPUTATION, 10.1016/j.amc.2019.124889, 370, 2020.04, Limiting the analysis to the so-called prisoner's dilemma situation, a new framework of 3-strategy game is proposed herein by adding a costly cooperative loner (CL) to the original strategies; cooperator and defector. Relaying on the replicator dynamics that presumes an infinite and well-mixed population, a set of equilibria is deliberately drawn. In contrast to the expectations from this study, the introduction of CL did not substantially alter the evolutionary trails and always ended with all-defectors state. Some arguments on why such counter-intuitive result comes about is are discussed. The outcomes are justified by the CL's dependency on the other two strategic types and the reduced power in foiling defectors compared to the paradigmatic costly punisher model. (C) 2019 Elsevier Inc. All rights reserved.. |
| 21. | Md Rajib Arefin, Jun Tanimoto, Evolution of cooperation in social dilemmas under the coexistence of aspiration and imitation mechanisms, PHYSICAL REVIEW E, 10.1103/PhysRevE.102.032120, 102, 3, 2020.09, Imitation and aspiration update rules are frequently observed in human and animal populations. While the imitation process entails payoff comparisons with surroundings, the aspiration process refers to self-evaluation. This work explores the evolution of cooperation in dyadic games under the coexistence of these two dynamics in an infinitely large well-mixed population. Two situations have been explored: (i) individuals adopt either an imitation or aspiration update rule with a certain probability, and (ii) the entire population is divided into two groups where one group only uses imitative rules and the other obeys aspiration updating alone. Both premises have been modeled by taking an infinite approximation of the finite population. In particular, the second mixing principle follows an additive property: the outcome of the whole population is the weighted average of outcomes from imitators and aspiration-driven individuals. Our work progressively investigates several variants of aspiration dynamics under strong selection, encompassing symmetric, asymmetric, and adaptive aspirations, which then coalesce with imitative dynamics. We also demonstrate which of the update rules performs better, under different social dilemmas, by allowing the evolution of the preference of update rules besides strategies. Aspiration dynamics always outperform imitation dynamics in the prisoner's dilemma, however, in the chicken and stag-hunt games the predominance of either update rule depends on the level of aspirations as well as on the extent of greed and fear present in the system. Finally, we examine the coevolution of strategies, aspirations, and update rules which leads to a binary state of obeying either imitation or aspiration dynamics. In such a circumstance, when aspiration dynamics prevail over imitation dynamics, cooperators and defectors coexist to an equal extent.. |
| 22. | K. M. Ariful Kabir, Jun Tanimoto, Cost-efficiency analysis of voluntary vaccination against n-serovar diseases using antibody-dependent enhancement: A game approach, JOURNAL OF THEORETICAL BIOLOGY, 10.1016/j.jtbi.2020.110379, 503, 2020.10, Records of epidemics acknowledge immunological multi-serotype illnesses as an important aspect of the occurrence and control of contagious diseases. These patterns occur due to antibody-dependent-enhancement (ADE) among serotype diseases, which leads to infection of secondary infectious classes. One example of this is dengue hemorrhagic fever and dengue shock syndrome, which comprises the following four serotypes: DEN-1, DEN-2, DEN-3, and DEN-4. The evolutionary vaccination game approach is able to shed light on this long-standing issue in a bid to evaluate the success of various control programs. Although immunization is regarded as one of the most accepted approaches for minimizing the risk of infection, cost and efficiency are important factors that must also be considered. To analyze the n-serovar aspect alongside ADE consequence in voluntary vaccination, this study establishes a new mathematical epidemiological model that is dovetailed with evolutionary game theory, an approach through which we explored two vaccine programs: primary and secondary. Our findings illuminate that the 'costefficiency' effect for vaccination decision exhibits an impact on controlling n-serovar infectious diseases and should be designed in such a manner as to avoid adverse effects. Furthermore, our numerical result justifies the fact that adopting ADE significantly boosted emerging disease incidence, it also suggest that the joint vaccine policy works even better when the complex cyclical epidemic outbreak takes place among multi serotypes interactions. Research also exposes that the primary vaccine is a better controlling tool than the secondary; however, introducing a highly-efficiency secondary vaccine against secondary infection plays a key role to control the disease prevalence. (C) 2020 Elsevier Ltd. All rights reserved.. |
| 23. | Muntasir Alam, K. M. Ariful Kabir, Jun Tanimoto, Based on mathematical epidemiology and evolutionary game theory, which is more effective: quarantine or isolation policy?, JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, 10.1088/1742-5468/ab75ea, 2020, 3, 2020.03, Outbreaks of repeated pandemics and heavy epidemics are daunting threats to human life. This study aims at investigating the dynamics of disease conferring temporary or waning immunity with several forced-control policies aided by vaccination game theory. Considering an infinite and well-mixed homogenous population, our proposed model further illustrates the significance of introducing two well-known forced control techniques, namely, quarantine and isolation, in order to model the dynamics of an infectious disease that spreads within a human population where pre-emptive vaccination has partially been taken before the epidemic season begins. Moreover, we carefully examine the combined effects of these two types (pre-emptive and forced) of protecting measures using the SEIR-type epidemic model. An in-depth investigation based on evolutionary game theory numerically quantifies the weighing impact of individuals' vaccinating decisions to improve the efficacy of forced control policies leading up to the relaxation of the epidemic spreading severity. A deterministic SVEIR model, including vaccinated (V) and exposed (E) states, is proposed having no spatial structure while implementing these intervention techniques. This study uses a mixed control strategy relying on quarantine and isolation policies to quantify the optimum requirement of vaccines for eradicating disease prevalence completely from human societies. Furthermore, our theoretical study justifies the fact that adopting forced control policies significantly reduces the required level of vaccination to suppress emerging disease prevalence, and it also confirms that the joint policy works even better when the epidemic outbreak takes place at a higher transmission rate. Research reveals that the isolation policy is a better disease attenuation tool than the quarantine policy, especially in endemic regions where the disease progression rate is relatively higher. However, a meager progression rate gradually weakens the speed of an epidemic outbreak and, therefore, applying a moderate level of control policies is sufficient to restore the disease-free state. Essentially, positive measures (pre-emptive vaccination) regulate the position of the critical line between two phases, whereas exposed provisions (quarantine or isolation) are rather dedicated to mitigating the disease spreading in endemic regions. Thus, an optimal interplay between these two types of intervention techniques works remarkably well in attenuating the epidemic size. Despite having advanced on the development of new vaccines and control strategies to mitigate epidemics, many diseases like measles, tuberculosis, Ebola, and flu are still persistent. Here, we present a dynamic analysis of the SVEIR model using mean-field theory to develop a simple but efficient strategy for epidemic control based on the simultaneous application of the quarantine and isolation policies.. |
| 24. | Jun Tanimoto, Masanori Futamata, Masaki Tanaka, Automated vehicle control systems need to solve social dilemmas to be disseminated, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2020.109861, 138, 2020.09, A new cellular automata traffic model based on the revised S-NFS model was established to consider a mixed flow of automated and human-driven vehicles assuming a multi-lane system. The model further classified automated vehicles into two categories: (1) vehicles with adaptive cruise control and (2) those with cooperative adaptive cruise control that supports so-called platoon driving. A vehicle that favors maximizing individual payoff, which ensures minimizing its own travel time, while maximizing global traffic flux was expected as the entire society. Intensive simulations, wherein automated and human driven vehicles were presumed as cooperative (C) and defective (D) strategies, respectively, revealed that a D-strategy is always better than a C-strategy to maximize individual payoff as long as a smaller cooperative fraction is imposed. Meanwhile, social optimal could be realized by a situation comprising only automated vehicles. Such a stag-hunt social dilemma implied that an automated vehicle control system (AVCS) cannot permeate into a population of human-driven vehicles if the dissemination stage starts from a single vehicle with an AVCS. (c) 2020 Elsevier Ltd. All rights reserved.. |
| 25. | Md Rajib Arefin, K. M. Ariful Kabir, Jun Tanimoto, A mean-field vaccination game scheme to analyze the effect of a single vaccination strategy on a two-strain epidemic spreading, JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, 10.1088/1742-5468/ab74c6, 2020, 3, 2020.03, We propose a mean-field vaccination game framework that combines two distinct processes: the simultaneous spreading of two strains of an influenza-like disease, and the adoption of vaccination based on evolutionary game theory presuming an infinite and well-mixed population. The vaccine is presumed to be imperfect such that it shows better efficacy against the original (resident) strain rather than the new one (mutant). The vaccination-decision takes place at the beginning of an epidemic season and depends upon the vaccine-effectiveness along with the cost. Additionally, we explore a situation if the original strain continuously converts to a new strain through the process of mutation. With the aid of numerical experiments, we explore the impact of vaccinating behavior on a specific strain prevalence. Our results suggest that the emergence of vaccinators can create the possibility of infection-prevalence of the new strain if the vaccine cannot bestow a considerable level of efficiency against that strain. On the other hand, the resident strain can continue to dominate under large-scale vaccine avoidance. Moreover, in the case of continuous mutation, the vaccine efficacy against the new strain plays a pivotal role to control the disease prevalence. We successfully obtain phase diagrams, displaying the infected fraction with each strain, final epidemic size, vaccination coverage, and average social payoff considering two-different strategy-update rules and provide a comprehensive discussion to get an encompassing idea, justifying how the vaccinating behavior can affect the spread of a disease having two strains.. |
| 26. | K. M. Ariful Kabir, Jun Tanimoto, The role of pairwise nonlinear evolutionary dynamics in the rock-paper-scissors game with noise, APPLIED MATHEMATICS AND COMPUTATION, 10.1016/j.amc.2020.125767, 394, 2021.04, The difference between conventional replicator dynamics and pairwise (PW) nonlinear Fermi dynamics can be discerned by studying the evolutionary dynamics of the interactions between the symmetric cyclic structure in the rock-paper-scissors game and interand intraspecific competitions. Often, conventional replicator models presume that the payoff difference among species is a linear function (a linear benefit). This study introduces a PW contrast under the properties of the well-known Fermi rule, where species play against one another in pairs. To model a PW nonlinear evolutionary environment (a nonlinear benefit) within this framework, both analytical and numerical approaches are applied. It is determined that the dynamics of the linear and nonlinear benefits can present the same stability conditions at equilibrium. Moreover, it is also demonstrated that, even in an identical equilibrium condition for both dynamics, the numerical result run by a deterministic approach presents a faster stability state for nonlinear benefit dynamics. This study also suggests that introducing mutation as demographic noise can effectively disrupt the phase regions and show the different relationships between linear and nonlinear dynamics. The symmetric bidirectional mutation among all the species reduced to the stable limit cycle by an arbitrary small mutation rate is also explored. Due to the environmental noise, however, linear and nonlinear exhibit the same steady state. Nevertheless, non-linearity illustrates more stable and faster stability situations. Our result suggests that environmental and demographic noise on the evolutionary dynamic framework can serve as a mechanism for supporting PW nonlinear dynamics in multi-species games. (C) 2020 Elsevier Inc. All rights reserved.. |
| 27. | Kohei Miyaji, Jun Tanimoto, The existence of fence-sitters relaxes the spatial prisoner's dilemma and enhances network reciprocity, APPLIED MATHEMATICS AND COMPUTATION, 10.1016/j.amc.2020.125624, 390, 2021.02, We introduce a new spatial prisoner's dilemma (SPD) model in which the so-called network reciprocity is enhanced more than in the conventional model. In addition to the usual binary strategies-perfect cooperator and perfect defector-we introduce "fence-sitters", who either cooperate or defect with equal probability, as a third strategy. In regions with larger Stag-Hunt-type dilemmas but smaller Chicken-type dilemmas, the existence of the fence-sitters works as a buffer, hampering the exploitation of cooperators by neighboring defectors and significantly enhancing the cooperative phase. Conversely, in regions with larger Chicken-type dilemmas but smaller Stag-Hunt-type dilemmas, the existence of the fence-sitters expands the critical dilemma strength for the survival of cooperation, but it reduces the cooperating fraction more than in the conventional model. What we have found may justify the conclusion that the existence of people with neutral opinions-often regarded betwixt and between-absorbs the severe competition between two extreme groups, bringing a more accommodationist situation to our society, backed with greater cooperation. (C) 2020 Elsevier Inc. All rights reserved.. |
| 28. | Md Anowar Hossain, Jun Tanimoto, The "backward-looking" effect in the continuum model considering a new backward equilibrium velocity function, NONLINEAR DYNAMICS, 10.1007/s11071-021-06894-2, 106, 3, 2061-2072, 2021.11, In this paper, a new continuum traffic model is developed considering the backward-looking effect through a new positive backward equilibrium speed function. As compared with the conventional full velocity difference model, the backward equilibrium velocity function, which is largely acceptably grounded from mathematical and physical perspectives, plays an important role in significantly enhancing the stability of the traffic flow field. A linear stability condition is derived to demonstrate the flow neutralization capacity of the model, whereas the Korteweg-de Vries-Burgers equation and the attendant analytical solution are deduced using nonlinear analysis to observe the traffic flow behavior near the neutral stability condition. A numerical simulation, used to determine the flow stability enhancement efficiency of the model, is also conducted to verify the theoretical results.. |
| 29. | Mir Shariful Islam, K. M. Ariful Kabir, Jun Tanimoto, Bidyut Baran Saha, Study on Spirulina platensis growth employing non-linear analysis of biomass kinetic models, HELIYON, 10.1016/j.heliyon.2021.e08185, 7, 10, 2021.10, Spirulina platensis has been considered a promising source of food supplement to combat malnutrition worldwide. Numerous investigations have stated its immune activity, ability to absorb CO2 during the growth period, and antioxidant potential. Well-known theoretical biomass kinetic model sheds are capable of qualitative analysis of the fast microalgae growth. In this regard, we considered eight popular biomass models: Monod, Haldane, Andrews & Noack, Teissier, Hinshelwood, Yano & Koga, Webb and, Aiba model comprising analytical investigation within the numerical simulation. Besides, in this study, we establish a new mathematical biomass growth model by merging the well-known Hinshelwood and Yano & Koga models. We explored the most suitable Spirulina growth model to minimize the overstated and understated growth trends in the assorted eight biomass kinetic models. Our findings show microalgae biomass growth and substrate diminishes along with time, and these results were compared with available experimental data. Results present a high value of R-2(0.9862), a low value of RSS (0.0813), AIC (-9.7277), and BIC (-8.2148) implied significantly fitted with the investigated data for the growth of Spirulina platensis compared with popular eight studied models.. |
| 30. | K. M. Ariful Kabir, Tori Risa, Jun Tanimoto, Prosocial behavior of wearing a mask during an epidemic: an evolutionary explanation, SCIENTIFIC REPORTS, 10.1038/s41598-021-92094-2, 11, 1, 2021.06, In the midst of the COVID-19 pandemic, with limited or no supplies of vaccines and treatments, people and policymakers seek easy to implement and cost-effective alternatives to combat the spread of infection during the pandemic. The practice of wearing a mask, which requires change in people's usual behavior, may reduce disease transmission by preventing the virus spread from infectious to susceptible individuals. Wearing a mask may result in a public good game structure, where an individual does not want to wear a mask but desires that others wear it. This study develops and analyzes a new intervention game model that combines the mathematical models of epidemiology with evolutionary game theory. This approach quantifies how people use mask-wearing and related protecting behaviors that directly benefit the wearer and bring some advantage to other people during an epidemic. At each time-step, a suspected susceptible individual decides whether to wear a facemask, or not, due to a social learning process that accounts for the risk of infection and mask cost. Numerical results reveal a diverse and rich social dilemma structure that is hidden behind this mask-wearing dilemma. Our results highlight the sociological dimension of mask-wearing policy.. |
| 31. | Masaki Tanaka, Jun Tanimoto, Proposal of an apposite strategy-updating rule for the vaccination game where hubs refer to hubs and lower-degree agents refer to lower-degree agents, BIOSYSTEMS, 10.1016/j.biosystems.2021.104532, 209, 2021.11, In the vaccination game, the spread of disease and the human decision-making to obtain pre-emptive vaccina-tions are coordinately united in successive seasons. This is backed both by epidemiological models, such as SIR, and by evolutionary game theory, assuming a given strategy-updating rule. Several rules have been proposed by the community and rely on either the imitation concept or the switching-action concept. The latter directly stipulates whether or not an agent commits to a course of action based on a rule, such as the aspiration concept. In contrast, the former borrowed its fundamental idea from the spatial version of a two-player, two-strategy (2 x 2) game, such as the spatial prisoner's dilemma (SPD). The pairwise Fermi (PW-Fermi) strategy has been heavily employed as the most representative idea. The present study modifies PW-Fermi, which consists of two processes: one for selecting a pairwise opponent to imitate and the other giving the probability of copying from the opponent. Instead of a random selection, our proposed model applies a stochastically skewed selection in which a neighbor who has a similar degree to the focal player is preferentially selected. This specific rule allows us to establish a quite efficient society, in which hub agents spontaneously obtain vaccination, but lower-degree agents do not. To this end, a small number of higher-degree agents, who are exposed to higher infection risk, are urged to be vaccinated, whereas many other agents enjoy free-riding. This produces a relatively small vaccination cost as a social sum and also effectively suppresses the spread of disease, resulting in a small disease cost for society as a whole.. |
| 32. | Md Rajib Arefin, Jun Tanimoto, Impact of the baseline payoff on evolutionary outcomes, PHYSICAL REVIEW E, 10.1103/PhysRevE.104.044314, 104, 4, 2021.10, Do individuals enjoying a higher baseline payoff behave similarly in competitive scenarios compared to their counterparts? The classical replicator equation does not answer such a question since it is invariant to the background or baseline payoff of individuals. In reality, however, if one's baseline payoff is higher than the possible payoffs of an interaction (or game), the individual may respond generously or indifferently if s(he) is satisfied with the prevailing benchmark payoff. This work intends to explore such a phenomenon within the realm of pairwise interactions-taking the prisoner's dilemma as a metaphor-in well-mixed finite and infinite populations. In this framework, a player uses the payoff (comprising baseline and game payoffs) -expectation difference to estimate a degree of eagerness and, with that degree of eagerness, revises his or her strategy with a certain probability. We adopt two approaches to explore such a context, naming them as the Fermi and imitation processes, in which the former uses a pairwise Femi function and the latter considers the relative fitness to estimate probabilities for strategy revision. In a finite population, we examine the effect of intensities to payoff-expectation and strategic payoff differences (denoted by k1 and k2, respectively) as well as the level of contentment (omega) on the fixation probability and fixation time (for a single defector). We observe that the fixation probability surges with the increase of intensity parameters. Nevertheless, the maximum fixation probability may require a substantially larger time to fixate, especially when the expectation is lower than the baseline payoff. This means that cooperators can persist for a longer period of time. A higher expectation or greed, however, considerably reduces the fixation time. Interestingly, our numerical simulation reveals that both approaches are equivalent under weak k2(sigma |
| 33. | Md. Rajib Arefin, Jun Tanimoto, Imitation and aspiration dynamics bring different evolutionary outcomes in feedback-evolving games, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 10.1098/rspa.2021.0240, 477, 2251, 2021.07, Feedback-evolving games characterize the interplay between the evolution of strategies and environments. Rich dynamics have been derived for such games under the premise of the replicator equation, which unveils persistent oscillations between cooperation and defection. Besides replicator dynamics, here we have employed aspiration dynamics, in which individuals, instead of comparing payoffs with opposite strategies, assess their payoffs by self-evaluation to update strategies. We start with a brief review of feedback-evolving games with replicator dynamics and then comprehensively discuss such games with aspiration dynamics. Interestingly, the tenacious cycles, as perceived in replicator dynamics, cannot be observed in aspiration dynamics. Our analysis reveals that a parameter -which depicts the strength of cooperation in enhancing the environment-plays a pivotal role in comprehending the dynamics. In particular, with the symmetric aspiration level, if replete and depleted states, respectively, experience Prisoner's Dilemma and Trivial games, the rich environment is achievable only when > 1. The case |
| 34. | K. M. Ariful Kabir, Aya Hagishima, Jun Tanimoto, Hypothetical assessment of efficiency, willingness-to-accept and willingness-to-pay for dengue vaccine and treatment: a contingent valuation survey in Bangladesh, HUMAN VACCINES & IMMUNOTHERAPEUTICS, 10.1080/21645515.2020.1796424, 17, 3, 773-784, 2021.03, In 2019, Bangladesh has grappled with a record-breaking surge in dengue fever, experiencing the highest number of dengue cases since the year 2000. Together, the intensification of dengue fever combined with a lack of dengue vaccines and appropriate medicines is expected to further the public and government’s interests in appropriate and potential dengue vaccines to control the epidemic. We considered people’s characteristics, dengue experience, and knowledge to assess their willingness-to-accept (WTA) and willingness-to-pay (WTP) for a hypothetical dengue vaccine and ex-post treatment in Bangladesh (June–July 2019). This study implemented a contingent valuation (CV) method with 3,251 respondents in 10 different locations of Bangladesh. All respondents participated in a hypothetical dengue vaccine scenario consisting of 65% (vaccine A), 80% (vaccine B), and 95% (vaccine C) effectiveness levels with three doses of each vaccine and ex-post dengue treatment. Around 71.2% of respondents were willing to pay for at least one of the hypothetical vaccines: A, B, or C. The average WTPs of the three vaccines amounted to US$ 47.0, US$ 66.0, and US$ 89.0, which were defined as the total cost of the doses necessary to obtain immunity. In Bangladesh, there is a significant demand for low-priced dengue vaccines, which was proven by people’s higher acceptance of vaccination practices. Though dengue vaccines are not yet available in Bangladesh, this study provides significant support that both the government and private sectors should work together to develop a reliable and affordable dengue vaccine.. |
| 35. | Yuichi Tatsukawa, Md Rajib Arefin, Masaki Tanaka, Jun Tanimoto, Free ticket, discount ticket or intermediate of the best of two worlds - Which subsidy policy is socially optimal to suppress the disease spreading?, JOURNAL OF THEORETICAL BIOLOGY, 10.1016/j.jtbi.2021.110682, 520, 2021.07, With the aid of the evolutionary vaccination game on a scale-free network, we design a new subsidy policy, named degree dependent subsidy, where cooperative agents get incentives according to their connectivity or degree. That is, agents, having a greater degree, receive a higher incentive, and vice versa. Here we presume that vaccinators are cooperative agents. The new scheme can be said to an intermediate policy between two previously studies policies, namely free ticket and flat discount policies. The former policy distributes free tickets to cooperative hub agents as a priority, whereas the latter dispenses a fixed discount to every cooperator. We compare the efficiency of each policy in terms of having a less infectious state with a minimum social cost. While investigating the performance of the three policies in terms of average social payoff-which takes into account the cost of vaccination as well as infection-the free ticket scheme is found to be the most appealing policies among the three when the budget for subsidy is quite low. The degree dependent subsidy policy outperforms others for a moderate budget size, while the flat discount policy requires a higher budget to effectively suppress the disease. We further estimate threshold levels of the subsidy budget for each policy beyond which subsidizing results in excessive use of vaccination. As a whole, concerning vaccination coverage and final epidemic size, the degree-dependent subsidy scheme outperforms the flat discount scheme, but is dominated by the free ticket policy. (C) 2021 Elsevier Ltd. All rights reserved.. |
| 36. | K. M. Ariful Kabir, Jun Tanimoto, Analysis of individual strategies for artificial and natural immunity with imperfectness and durability of protection, JOURNAL OF THEORETICAL BIOLOGY, 10.1016/j.jtbi.2020.110531, 509, 2021.01, As protection against infectious disease, immunity is conferred by one of two main defense mechanisms, namely (i) resistance generated by previous infection (known as natural immunity) or (ii) by being vaccinated (known as artificial immunity). To analyze, a modified SVIRS epidemic model is established that integrates the effects of the durability of protection and imperfectness in the framework of the human decision-making process as a vaccination game. It is supposed that immunized people become susceptible again when their immunity expires, which depends on the duration of immunity. The current theory for most voluntary vaccination games assumes that seasonal diseases such as influenza are controlled by a temporal vaccine, the immunity of which lasts for only one season. Also, a novel perspective is established involving an individual's immune system combined with self-interest to take the vaccine and natural immunity obtained from infection by coupling a disease-spreading model with an evolutionary game approach over a long period. Numerical simulations show that the longer attenuation helps significantly to control the spread of disease. Also discovered is the entire mechanism of active and passive immunities, in the sense of how they coexist with natural and artificial immunity. Thus, the prospect of finding the optimal strategy for eradicating a disease could help in the design of effective vaccination campaigns and policies. (C) 2020 Elsevier Ltd. All rights reserved.. |
| 37. | K. M. Ariful Kabir, Atiqur Chowdhury, Jun Tanimoto, An evolutionary game modeling to assess the effect of border enforcement measures and socio-economic cost: Export-importation epidemic dynamics, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2021.110918, 146, 2021.05, In the wake of the novel coronavirus, SARS-CoV-19, the world has undergone a critical situation in which grave threats to global public health emerged. Among human populations across the planet, travel restraints, border enforcement measures, quarantine, and isolation provisions were implemented to control and limit the spread of the contagion. Decisions on implementing and enforcing various control policies should be determined based on available real-world evidence and theoretical prediction. Further, countries around the globe-imposed force-quarantine and strict lockdown against the spreading could be unsustainable in the long run because of economic burden and people's frustration. This study proposes a novel exportation- importation epidemic model associated with behavioral dynamics under the evolutionary game theory by considering the two-body system: a source country of a contagious disease and a neighboring disease-free state. The model is first applied to the original COVID-19 data in China, Italy, and the Republic of Korea (ROK) and observed through consistent fitting results with equivalent goodness-of-fit. Then, the data are estimated per the appropriate parameters. Driven by these parametric settings and considering the normalized population, the numerical analysis, and epidemiological exploration, this work further elucidates the substantial impact of quarantine policies, healthcare facilities, socio-economic cost, and the public counter-compliance effect. Extensive numerical analysis shows that funds spent on the individual level as "emergency relief-package" can reduce the infection and improve quarantine policy success. Our results also explore that controlling border measurement can work well in the final epidemic stage of disease only if the cost is low. (C) 2021 Elsevier Ltd. All rights reserved.. |
| 38. | Muntasir Alam, Yuki Ida, Jun Tanimoto, Abrupt epidemic outbreak could be well tackled by multiple pre-emptive provisions-A game approach considering structured and unstructured populations, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2020.110584, 143, 2021.02, Forecasting the dynamics of flu epidemics could be vital for policy-making concerning the allocation of public health resources. Reliable predictions about disease transmission networks also help fix the benchmark for reconciling diverse aspects to the decision-makers while selecting and implementing a suitable health intervention. To this aim, we propose an SIR/V M epidemic game model to reveal the dynamic evolution of intervention policies, entangling social feedbacks, behavioral responses, and viral transmission on several network topologies into a single framework. Besides vaccination, this study introduces intermediate defense measures (IDM) as an alternative provision to restraint the epidemic resurgence in structured and unstructured populations. Although heterogeneity is a commonly observed phenomenon in human populations, many antecedent studies typically preferred homogenous networks. Here, we investigate the disparities found in epidemic diffusion within homogeneous and heterogeneous networks, employing a mean-field approximation and multi-agent simulation, respectively. Additionally, we explore both network types simultaneously and justify their potential impacts on control provisions' success. As a general tendency, vaccination and IDM complement each other within the entire parametric regions. Our study elucidates the coexistence of multiple policies as well as the abrupt emergence of stain points adopting several network topologies. A careful investigation on stain points reveals that hub agents solely rely on free-riding brings the endemic state of an epidemic, triggered by a sudden extinction of vaccinators and self-protectors. The emergence of too many self-interested people spoils the herd immunity state and initiates the outbreaks, heavily observed in well-mixed and scale-free networks. On the other hand, the coexistence of policies occurs mostly in the networks mentioned above but rarely seen in the lattice network. The robustness of the proposed model has been tested by adding mean-field theoretical results for a nonspatial population and agent-based simulated outcomes for spatial populations under a wide variety of parametric conditions. Model outcomes confirm that the game-payoff regulates the epidemic dynamics, while the epidemic propagation governs individuals' health status. Moreover, we expose a complex interplay between cost and efficacy of control provisions and justify keeping the provisional costs reasonably lower would be an ultimate challenge to maintain disease attenuation. The central theme of this paper is thus to portray the holistic summary of epidemic prevalence and the relative contribution of each intervention to epidemic remission.(c) 2020 Elsevier Ltd. All rights reserved.. |
| 39. | K. M. Ariful Kabir, Jun Tanimoto, A cyclic epidemic vaccination model: Embedding the attitude of individuals toward vaccination into SVIS dynamics through social interactions, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2021.126230, 581, 2021.11, Social norms have a profound influence on the perception of vaccination. People's attitudes toward vaccination reflect their inherent recognition of the trade-off between vaccine acceptance and risk of infection. Here we model a new path of cyclic epidemic dynamics in vaccination aspects by considering the vaccine acceptance and fear of infection, where the social dynamics are embedded into the mathematical epidemiological framework. Besides the already established vaccination game models, we develop a model called the cyclic mean-field (CMF) model vis-a-vis the cyclic behavioral (CBH) model. In the CMF model, we presume that, like disease transmission, the propelling process for vaccination also occurs through human contact, and the deflating vaccination (low vaccination acceptance) is also integrated into the social interactions of individuals. We analytically investigate the model framework through a rich phase diagram. Extensive numerical simulation suggests that effective vaccination may meaningfully reduce the community risk of infection. Provided a proactive attitude toward vaccination and fair recognition of disease risk can be developed, the vaccination uptake can be enhanced, thereby resulting in reduced epidemic prevalence. Our investigation might provide a new epidemiological dynamics concept that considers the social dynamics embedded into the alteration rate of vaccination. (C) 2021 Elsevier B.V. All rights reserved.. |
| 40. | Kohei Miyaji, Jun Tanimoto, A co-evolutionary model combined mixed-strategy and network adaptation by severing disassortative neighbors promotes cooperation in prisoner's dilemma games, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2020.110603, 143, 2021.02, A co-evolutionary model of both network and mixed strategy is proposed in this study. The assigned strategy s(i) of agent i is defined by a real number ranging from 0 to 1, which probabilistically ordains a subsequent action of either cooperation or defection as the agent's offer. We assume a network dynamic to support or hamper the enhancement of cooperation, where an agent severs a link with the neighbor who has the most disassortative strategy. This means that an agent tends to maintain interactions only with neighbors that resemble the agent. A series of numerical simulations reveal that our "assortative grouping" framework enhances cooperation. Interestingly, when a low network adaptation speed and a certain degree of strategy copy error are presumed, phenomenal network heterogeneity evolves, one that realizes more significant cooperation as compared to error-free cases. (C) 2020 Elsevier Ltd. All rights reserved.. |
| 41. | 真光俊樹, 池谷直樹, 廣瀬智陽子, 谷本潤, 萩島理, 都市乱流境界層を対象とした数値流体解析の運動量供給方法による乱流統計量への影響, 日本建築学会環境系論文集, 10.3130/aije.87.145, 第87巻, 第792号, 145-156, 2022.02. |
| 42. | 廣瀬智陽子, 池谷直樹, 萩島理, 谷本潤, 通風換気時における都市内建物の室内気流性状把握のための数値流体解析, 日本建築学会環境系論文集, 10.3130/aije.87.19, 第87巻, 第791号, 19-28, 2022.01. |
| 43. | Fumi Sueyoshi, Shinobu Utsumi, Jun Tanimoto, Underlying social dilemmas in mixed traffic flow with lane changes, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2022.111790, 155, 2022.02, A new cellular automata traffic model based on Revised S-NFS model is established to consider a mixed flow system in which the maximal velocity of the agents is distributed, as is the case in a real traf-fic flow fields composed of compact vehicles, trucks, and buses. These vehicles are assigned on of two different strategies: cooperator (C), who remains in his original lane, and defector (D), who undertakes lane-changing to maximize his own payoff, i.e., average velocity. In a systematic series of multi-agent simulations, we quantitatively compare flow characteristics in the default system (where maximal ve -locity is constant across all agents), mixed traffic flow systems (which permit a distribution of maximal velocities), and correlated-mixed traffic flows, in which an agent with a higher maximal velocity tends to have a D strategy whereas one with a lower maximal velocity tends to have a C strategy. We discuss what kind of game class is underlying in each traffic flow system. Furthermore, we quantitatively study the social efficiency deficit, an index of dilemma extent, for each of the flow systems. (c) 2022 Elsevier Ltd. All rights reserved.. |
| 44. | Yuichi Tatsukawa, Md Rajib Arefin, Shinobu Utsumi, Kazuki Kuga, Jun Tanimoto, Stochasticity of disease spreading derived from the microscopic simulation approach for various physical contact networks, APPLIED MATHEMATICS AND COMPUTATION, 10.1016/j.amc.2022.127328, 431, 127328-127328, 2022.10, COVID-19 has emphasized that a precise prediction of a disease spreading is one of the most pressing and crucial issues from a social standpoint. Although an ordinary differential equation (ODE) approach has been well established, stochastic spreading features might be hard to capture accurately. Perhaps, the most important factors adding such stochasticity are the effect of the underlying networks indicating physical contacts among individuals. The multi-agent simulation (MAS) approach works effectively to quantify the stochasticity. We systematically investigate the stochastic features of epidemic spreading on homogeneous and heterogeneous networks. The study quantitatively elucidates that a strong microscopic locality observed in one- and two-dimensional regular graphs, such as ring and lattice, leads to wide stochastic deviations in the final epidemic size (FES). The ensemble average of FES observed in this case shows substantial discrepancies with the results of ODE based mean-field approach. Unlike the regular graphs, results on heterogeneous networks, such as Erdos-Renyi random or scale-free, show less stochastic variations in FES. Also, the ensemble average of FES in heterogeneous networks seems closer to that of the mean-field result. Although the use of spatial structure is common in epidemic modeling, such fundamental results have not been well-recognized in literature. The stochastic outcomes brought by our MAS approach may lead to some implications when the authority designs social provisions to mitigate a pandemic of un-experienced infectious disease like COVID-19. (C) 2022 Elsevier Inc. All rights reserved.. |
| 45. | Hiromu Ito, Takayuki Wada, Genki Ichinose, Jun Tanimoto, Jin Yoshimura, Taro Yamamoto, Satoru Morita, Social dilemma in the excess use of antimicrobials incurring antimicrobial resistance, SCIENTIFIC REPORTS, 10.1038/s41598-022-25632-1, 12, 1, 21084, 2022.12, The emergence of antimicrobial resistance (AMR) caused by the excess use of antimicrobials has come to be recognized as a global threat to public health. There is a 'tragedy of the commons' type social dilemma behind this excess use of antimicrobials, which should be recognized by all stakeholders. To address this global threat, we thus surveyed eight countries/areas to determine whether people recognize this dilemma and showed that although more than half of the population pays little, if any, attention to it, almost 20% recognize this social dilemma, and 15-30% of those have a positive attitude toward solving that dilemma. We suspect that increasing individual awareness of this social dilemma contributes to decreasing the frequency of AMR emergencies.. |
| 46. | Md. Mamun-Ur-Rashid Khan, Md. Rajib Arefin, Jun Tanimoto, Investigating the trade-off between self-quarantine and forced quarantine provisions to control an epidemic: An evolutionary approach, APPLIED MATHEMATICS AND COMPUTATION, 10.1016/j.amc.2022.127365, 432, 2022.11, During a pandemic event like the present COVID-19, self-quarantine, mask-wearing, hy-giene maintenance, isolation, forced quarantine, and social distancing are the most effec-tive nonpharmaceutical measures to control the epidemic when the vaccination and proper treatments are absent. In this study, we proposed an epidemiological model based on the SEIR dynamics along with the two interventions defined as self-quarantine and forced quarantine by human behavior dynamics. We consider a disease spreading through a pop-ulation where some people can choose the self-quarantine option of paying some costs and be safer than the remaining ones. The remaining ones act normally and send to forced quarantine by the government if they get infected and symptomatic. The government pays the forced quarantine costs for individuals, and the government has a budget limit to treat the infected ones. Each intervention derived from the so-called behavior model has a dy-namical equation that accounts for a proper balance between the costs for each case, the total budget, and the risk of infection. We show that the infection peak cannot be reduced if the authority does not enforce a proactive (quantified by a higher sensitivity parameter) intervention. While comparing the impact of both self-and forced quarantine provisions, our results demonstrate that the latter is more influential to reduce the disease prevalence and the social efficiency deficit (a gap between social optimum payoff and equilibrium payoff).(c) 2022 Elsevier Inc. All rights reserved.. |
| 47. | Yuichi Tatsukawa, Md. Rajib Arefin, Shinobu Utsumi, Jun Tanimoto, Investigating the efficiency of dynamic vaccination by consolidating detecting errors and vaccine efficacy, SCIENTIFIC REPORTS, 10.1038/s41598-022-12039-1, 12, 1, 2022.05, Vaccination, if available, is the best preventive measure against infectious diseases. It is, however, needed to prudently design vaccination strategies to successfully mitigate the disease spreading, especially in a time when vaccine scarcity is inevitable. Here we investigate a vaccination strategy on a scale-free network where susceptible individuals, who have social connections with infected people, are being detected and given vaccination before having any physical contact with the infected one. Nevertheless, detecting susceptible (also infected ones) may not be perfect due to the lack of information. Also, vaccines do not confer perfect immunity in reality. We incorporate these pragmatic hindrances in our analysis. We find that if vaccines are highly efficacious, and the detecting error is low, then it is possible to confine the disease spreading-by administering a less amount of vaccination-within a short period. In a situation where tracing susceptible seems difficult, then expanding the range for vaccination targets can be socially advantageous only if vaccines are effective enough. Our analysis further reveals that a more frequent screening for vaccination can reduce the effect of detecting errors. In the end, we present a link percolation-based analytic method to approximate the results of our simulation.. |
| 48. | Shinobu Utsumi, Md. Rajib Are, Yuichi Tatsukawa, Jun Tanimoto, How and to what extent does the anti-social behavior of violating self-quarantine measures increase the spread of disease?, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2022.112178, 159, 2022.06, COVID-19 has shown that quarantine (or self-isolation) may be the only available tool against an unknown infectious disease if neither an effective vaccine nor anti-viral medication is available. Motivated by the fact that a considerable number of people were not compliant with the request for self-quarantine made by public authorities, this study used a multi-agent simulation model, whose results were validated by theory work, which highlights how and to what extent such an anti-social behavior hampers the confinement of a disease. Our framework quantifies two important scenarios: in one scenario a certain number of individuals totally ignore quarantine, whereas in the second scenario a larger number of individuals partially ignore the imposed policy. Our results reveal that the latter scenario can be more hazardous even if the total amount of social deficit of activity-measured by the total number of severed links in a physical network-would be same as the former scenario has, of which quantitative extent is dependent on the fraction of asymptomatic infected cases and the level of quarantine intensity the government imposing. Our findings have significance not only to epidemiology but also to research in the broader field of network science. PACS numbers: Theory and modeling; computer simulation, 87.15.Aa; Dynamics of evolution, 87.23.Kg. (c) 2022 Elsevier Ltd. All rights reserved.. |
| 49. | Md Ahsan Habib, K. M.Ariful Kabir, Jun Tanimoto, Evolutionary Game Analysis For Sustainable Environment Under Two Power Generation Systems, Evergreen, 10.5109/4793672, 9, 2, 326-344, 2022.06, With the rapid prosperity of the global economy and industry, as the energy demand, many factors influence power-producing sectors, including government incentives, customer demand, production cost, eco-friendly, and investors investment. To analyze the cost-benefit-subsidy in power generator system under the evolutionary game setting, we considered two asymmetric game structures by coupling the photovoltaic (PV) power system and coal-fired (CF) power system. To model the asymmetric games for PV and CF, Game-1 considers respective cost and benefit, whereas, Game-2 deliberates cost, benefit, and government subsidy. We present both analytical and numerical approaches within this framework.. |
| 50. | Shinobu Utsumi, Yuichi Tatsukawa, Jun Tanimoto, Does a resource-storing mechanism favor "the wealthy do not fight"?- An approach from evolutionary game theory, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2022.112207, 160, 2022.07, Motivated by an interdisciplinary question of whether a resource-storing mechanism favors "the wealthy do fight" or "the wealthy do not fight," we establish a new model based on spatial prisoner's dilemma (SPD) game where a time-accumulating payoff is allowed, and the probability of game participation depending on wealthiness is introduced. Although the model is based on a universal framework, presuming SPDs as a template, the conclusion drawn from the model is interdisciplinary rich. Our simulation results reveal that the common sense (or say, human's philosophical wisdom) of "the wealthy do not fight" helps to emerge a fairly cooperative society depending on the dilemma strength. By contrast, remarkably, it suggests that the common sense of "the wealthy do fight" begets a skewed exploitation society where defectors who exploit poor cooperators prosper.PACS numbers Theory and modeling; computer simulation, 87.15.Aa; Dynamics of evolution, 87.23.Kg.(c) 2022 Elsevier Ltd. All rights reserved.. |
| 51. | Junfeng Fan, Dawei Zhao, Chengyi Xia, Jun Tanimoto, Coupled spreading between information and epidemics on multiplex networks with simplicial complexes, CHAOS, 10.1063/5.0125873, 32, 11, 2022.11, The way of information diffusion among individuals can be quite complicated, and it is not only limited to one type of communication, but also impacted by multiple channels. Meanwhile, it is easier for an agent to accept an idea once the proportion of their friends who take it goes beyond a specific threshold. Furthermore, in social networks, some higher-order structures, such as simplicial complexes and hypergraph, can describe more abundant and realistic phenomena. Therefore, based on the classical multiplex network model coupling the infectious disease with its relevant information, we propose a novel epidemic model, in which the lower layer represents the physical contact network depicting the epidemic dissemination, while the upper layer stands for the online social network picturing the diffusion of information. In particular, the upper layer is generated by random simplicial complexes, among which the herd-like threshold model is adopted to characterize the information diffusion, and the unaware-aware-unaware model is also considered simultaneously. Using the microscopic Markov chain approach, we analyze the epidemic threshold of the proposed epidemic model and further check the results with numerous Monte Carlo simulations. It is discovered that the threshold model based on the random simplicial complexes network may still cause abrupt transitions on the epidemic threshold. It is also found that simplicial complexes may greatly influence the epidemic size at a steady state. Published under an exclusive license by AIP Publishing.. |
| 52. | Chiyoko Hirose, Naoki Ikegaya, Aya Hagishima, Jun Tanimoto, Computational fluid dynamics for cross-ventilated airflow in a urban building, JAPAN ARCHITECTURAL REVIEW, 10.1002/2475-8876.12312, 00, 1, 1-9, 2022.11, In this study, the velocity field in a naturally ventilated building within an urban-like array was explored using large-eddy simulations. Reduced-scale building models were used to examine the impacts of the geometric conditions in the surrounding buildings and cross-ventilating windows on the flow statistics and instantaneous velocity fields in the sheltered building. The instantaneous velocity components averaged in the opening area were calculated for each condition of the building arrays and openings. The results indicate that the surrounding urban geometry significantly affects the turbulent opening velocities. Additionally, the three-dimensional instantaneous velocity distributions within the target building clearly demonstrate considerable differences under the different building and opening conditions. Such differences also affect the mean, maximum, and minimum wind speeds within the indoor regions. Moreover, the distributions of the two-point correlation coefficient (defined by the velocities normal to the windows at the center of the windward opening and inside the building) were compared for each condition. The strong correlations near the two openings indicate that the instantaneous velocity generated by the surrounding buildings is an important factor in determining the statistical and instantaneous features of indoor ventilating airflows.. |
| 53. | Risa Tori, Jun Tanimoto, A study on prosocial behavior of wearing a mask and self-quarantining to prevent the spread of diseases underpinned by evolutionary game theory, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2022.112030, 158, 2022.05, In the wake of COVID-19, mask-wearing practice and self-quarantine is thought to be the most effective means of controlling disease spread. The current study develops an epidemiological model based on the SEIR process that takes into account dynamic human behavior toward those two preventive measures. In terms of quantifying the effect of wearing a mask, our model distinguishes itself by accounting for the effect of self-protection as well as the effect of reducing a potential risk to other individuals in different formulations. Each of the two measures de-rived from the so-called behavior model has a dynamical equation that takes into account the delicate balance between the cost of wearing a mask/self-quarantine and the risk of infection. The dynamical system as a whole contains a social dilemma structure because of whether to commit to preventing measures or seek the possibility of infection-free without paying anything. The numerical result was delivered along the social efficiency deficit, quantifying the extent to which Nash equilibrium has been improved to a social optimal state. PACS numbers Theory and modeling; computer simulation, 87.15.Aa; Dynamics of evolution, 87.23.Kg (c) 2022 Elsevier Ltd. All rights reserved.. |
| 54. | Md Anowar Hossain, Jun Tanimoto, A microscopic traffic flow model for sharing information from a vehicle to vehicle by considering system time delay effect, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2021.126437, 585, 2022.01, In this study, we propose an information-sharing traffic flow model by considering multiple preceding cars and system time delay effect to reproduce a more likely flow field given the dissemination of intelligent transportation systems with wireless communication. The flow field would be robustly stable and efficient if the information on each vehicle's dynamics could be shared without time delay. However, a realistic situation inevitably entails some time delay, resulting from mechanical and control systems. The proposed model is validated by the neutral stability condition through linear stability theory, thus confirming that the proposed model substantially increases the stability of a traffic flow field compared with the conventional full velocity difference model (optimal velocity model). The modified Korteweg-de Vries equation is derived and analyzed for nonlinear analysis. A numerical simulation is also conducted to justify the proposed model. (C) 2021 Elsevier B.V. All rights reserved.. |
| 55. | Md Anowar Hossain, Jun Tanimoto, A dynamical traffic flow model for a cognitive drivers' sensitivity in Lagrangian scope, SCIENTIFIC REPORTS, 10.1038/s41598-022-22412-9, 12, 1, 2022.10, A new microscopic traffic flow model is established based on heterogeneous driver's sensitivity; in this new model, the driver's sensitivity is defined as being dependent on the headway distances to the preceding vehicle, similar to Bando's optimal velocity function. We introduce the formulation of this cognitive driver's sensitivity utilizing a modified form of Bando's optimal velocity function. A simple methodology, which is used for improving Bando's optimal velocity function, has been implemented for developing the cognitive driver's sensitivity function, which establishes a correlation between the flow field's density and human drivers' responses. The model is highly advanced for introducing a human-driven traffic flow field considering the driver's mental behavioral activity. Using the linear stability condition, we elucidate a neutral stability condition. A series of numerical simulations indicates how the present model describes dynamics that differ from the conventional model, which assumes a constant driver's sensitivity.. |
| 56. | Md. Mamun-Ur-Rashid Khan, Md. Rajib Arefin, Jun Tanimoto, Time delay of the appearance of a new strain can affect vaccination behavior and disease dynamics: An evolutionary explanation, INFECTIOUS DISEASE MODELLING, 10.1016/j.idm.2023.06.001, 8, 3, 656-671, 2023.09, COVID-19 vaccination behavior using an SEIRM/V. |
| 57. | K. M.Ariful Kabir, M. D. Shahidul Islam, Shinobu Utsumi, Jun Tanimoto, The emergence of rich complex dynamics in a spatial dyadic game with resource storage, participation cost, and agent interaction propensity, Chaos, Solitons and Fractals, 10.1016/j.chaos.2023.114035, 175, 2023.10, We present an evolutionary game model combining subordinate elements from several viewpoints to address whether a resource-storing mechanism promotes a society where the wealthy engage in or refrain from conflict. The model is based on the pairwise game, which incorporates the accumulation of payoffs over time and introduces the concept of participation probability based on wealthiness. Our study encompasses four distinct game classes: Prisoner's Dilemma, Trivial, Stag Hunt, and Chicken. By incorporating these diverse social dilemma structures, we strive to comprehensively understand the dynamics within different game scenarios. Additionally, we broaden the scope of our analysis by considering two network types: a regular lattice network and a Barabasi-Albert scale-free (BA-SF) graph. Through simulation results, we have discovered that the commonly held belief or human philosophical wisdom that “the wealthy do not fight” leads to the emergence of a cooperative society, depending on the intensity of the dilemma. In contrast, our findings strongly suggest that the prevailing notion of “the wealthy do fight” fosters an imbalanced exploitation-based society where defectors who exploit the poor cooperators thrive. Further analysis shows variations in beliefs and dynamics between cooperators and defectors, highlighting the emergence of social dilemmas and the impact of payoff storage. Our result reported here proves that the proposed model based on a minimal spatial game setting by 2-player & 2-strategy game just added several subordinate components can reproduce rich, complex scenarios likely observed in a real human society.. |
| 58. | Kouki Okita, Yuichi Tatsukawa, Shinobu Utsumi, Md. Rajib Arefin, Md. Anowar Hossain, Jun Tanimoto, Stochastic resonance effect observed in a vaccination game with effectiveness framework obeying the SIR process on a scale-free network, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2022.113029, 167, 2023.02, This study investigates a standard vaccination game presuming the repeated-season framework, in which we mutually merge the dynamics of disease spread, which obeys the SIR process, and human decision-making as regards whether or not to get vaccinated at the beginning of each season with reference to the evolutionary game theory. We herein presume the Barab ' asi-Albert scale-free (BA-SF) graph as an underlying network. Accordingly, we explore whether or not an additive noise to the transmission rate brings an advantageous stochastic resonance effect for confining a disease's spread. The results show that with a higher vaccination cost and/or a lower vaccine efficacy, the stochastic noise has no gap in vaccination coverage (VC) with the default without noise case, but brings a smaller final epidemic size (FES). In contrast, at a lower vaccination cost and a higher vaccine efficacy, the additive stochastic noise brings a smaller VC that consequently results in a larger FES than the default without noise case. This phenomenon is completely different from our previously reported bolstered enhancement effect of network reciprocity, in which each element of a payoff matrix is exposed to stochastic noise.. |
| 59. | Zehua Si, Zhixue He, Chen Shen, Jun Tanimoto, Speculative defectors as unexpected insulators of super cooperators in structured populations, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2023.113391, 170, 2023.05, In this work, we extend the spatial prisoner's dilemma game by introducing three competing strategies: unconditional cooperators (C); super cooperators (SC); and speculative defectors (SD). Unconditional cooperators cooperate with their opponent no matter what the opponent does. In contrast, SC first cooperate with their opponent, then reward or punish them based on whether the opponent cooperated or defected. SD cooperate with SC based on certain prior information level, but otherwise defect as default. We investigated the evolutionary dynamics of the extended prisoner's dilemma game in structured populations. Through extensive Monte Carlo simulations, we showed that increasing the information level q generally facilitates the evolution of SC, but destroys them if the cost of SC is high. Counterintuitively, SD who cooperate with SC can form an active layer around them, which eliminates the free riding chance on SC for unconditional cooperators. Our results indicate that SD may not always impede cooperators.. |
| 60. | Itsuki Nishimura, Md Rajib Arefin, Yuichi Tatsukawa, Shinobu Utsumi, Md. Anowar Hossain, Jun Tanimoto, Social dilemma analysis on vaccination game accounting for the effect of immunity waning, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2023.113426, 171, 2023.06, A new SEIRS-based ODE (Ordinary Differential Equation) model is built, where asymptomatic and symptomatic infectious compartments, hospitalized state and immune state are additionally introduced, which is dovetailed with a behavior model that defines the vaccination rate as time-variable. We also apply Social Efficiency Deficit; SED, to quantitatively identify whether or not social dilemma taking place behind the model dynamics. Numerical results prove that, depending on the fraction of asymptomatic infected individuals and the discount ratio of infected force for asymptomatic state compared with that for symptomatic one, whether or not social dilemma appearing is different, which is also substantially affected by the vaccination cost and the immunity waning rate. The behavior model tends to incur a slight social dilemma brought by wasting vaccination even in the region of disease free, identified by R0 |
| 61. | Gopal Sharma, Hao Guo, Chen Shen, Jun Tanimoto, Small bots, big impact: solving the conundrum of cooperation in optional Prisoner's Dilemma game through simple strategies, JOURNAL OF THE ROYAL SOCIETY INTERFACE, 10.1098/rsif.2023.0301, 20, 204, 2023.07, Cooperation plays a crucial role in both nature and human society, and the conundrum of cooperation attracts the attention from interdisciplinary research. In this study, we investigated the evolution of cooperation in optional Prisoner's Dilemma games by introducing simple bots. We focused on one-shot and anonymous games, where the bots could be programmed to always cooperate, always defect, never participate or choose each action with equal probability. Our results show that cooperative bots facilitate the emergence of cooperation among ordinary players in both well-mixed populations and a regular lattice under weak imitation scenarios. Introducing loner bots has no impact on the emergence of cooperation in well-mixed populations, but it facilitates the dominance of cooperation in regular lattices under strong imitation scenarios. However, too many loner bots on a regular lattice inhibit the spread of cooperation and can eventually result in a breakdown of cooperation. Our findings emphasize the significance of bot design in promoting cooperation and offer useful insights for encouraging cooperation in real-world scenarios.. |
| 62. | Md. Mamun-Ur-Rashid Khan, Jun Tanimoto, Investigating the social dilemma of an epidemic model with provaccination and antivaccination groups: An evolutionary approach, ALEXANDRIA ENGINEERING JOURNAL, 10.1016/j.aej.2023.05.0911110-0168, 75, 341-349, 2023.07, In this study, an epidemiological model with the provaccination and antivaccination sus-ceptible groups is proposed, and the social dilemma of the model is analyzed. During a pandemic, such as the current COVID-19, many individuals get confused to choose the option of adopting a provaccination or antivaccination strategy based on the number of infected people and the payoff of being infected. In the proposed model, people can obtain immunity either through vaccination or by getting infected with the disease which is known as natural immunity. In addition, increasing the waning immunity influences the choice of adopting the provaccination or antivaccination strategy. We used the behavior model to analyze the choice of the two strategies, where any individual can choose a strategy based on the number of infected individuals from each group. Moreover, individ-uals who are already infected can choose their strategy based on the payoff of their disease cost or vaccination cost. Our results show that, at Nash equilibrium, individuals in both groups behave the same. Further, from our numerical results, increasing the number of vaccinations can reduce the social dilemma whereas an increase in the waning immunity rate increases the social dilemma. & COPY; 2023 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).. |
| 63. | Shuofan Zhang, Dawei Zhao, Chengyi Xia, Jun Tanimoto, Impact of simplicial complexes on epidemic spreading in partially mapping activity-driven multiplex networks, CHAOS, 10.1063/5.0151881, 33, 6, 2023.06, Over the past decade, the coupled spread of information and epidemic on multiplex networks has become an active and interesting topic. Recently, it has been shown that stationary and pairwise interactions have limitations in describing inter-individual interactions , and thus, the introduction of higher-order representation is significant. To this end, we present a new two-layer activity-driven network epidemic model, which considers the partial mapping relationship among nodes across two layers and simultaneously introduces simplicial complexes into one layer, to investigate the effect of 2-simplex and inter-layer mapping rate on epidemic transmission. In this model, the top network, called the virtual information layer, characterizes information dissemination in online social networks, where information can be diffused through simplicial complexes and/or pairwise interactions. The bottom network, named as the physical contact layer, denotes the spread of infectious diseases in real-world social networks. It is noteworthy that the correspondence among nodes between two networks is not one-to-one but partial mapping. Then, a theoretical analysis using the microscopic Markov chain (MMC) method is performed to obtain the outbreak threshold of epidemics, and extensive Monte Carlo (MC) simulations are also carried out to validate the theoretical predictions. It is obviously shown that MMC method can be used to estimate the epidemic threshold; meanwhile, the inclusion of simplicial complexes in the virtual layer or introductory partial mapping relationship between layers can inhibit the spread of epidemics. Current results are conducive to understanding the coupling behaviors between epidemics and disease-related information.. |
| 64. | Md Rajib Arefin, Yuichi Tatsukawa, Jun Tanimoto, Evolution of cooperation under the coexistence of imitation and aspiration dynamics in structured populations, NONLINEARITY, 10.1088/1361-6544/acc500, 36, 5, 2286-2309, 2023.05, Imitation and aspiration learning rules are frequently observed in humans and animals. The former is an act of copying other's action, whereas the latter is characterized by the self-evaluation. Here we study the coexistence of these learning mechanisms in structured populations. Both rules have been combined focusing on two different scenarios: (I) adoption of either update rule with a certain probability, and (II) grouping the entire population according to the update rules. We present two pair approximation models, illustrating both scenarios, which yield a nice agreement-under weak selection-with that of agent-based simulations. For weak selection and large population size, we find that the condition for cooperation to dominate defection is similar in both heterogeneous and homogeneous update rules. We examine several variants of the mixed model such as time-evolving aspirations alongside strategies and the coevolution of strategies and update rules. In the former case, our simulation reveals that Prisoner's dilemma and, in some cases, Stag-hunt experience overall less aspiration levels compared to other games such as Chicken or Trivial. The coevolution of strategies and update rules demonstrates a better cooperation, in contrast to the fixed update rule case, exhibiting the possibility of asymptotic coexistence of both learning mechanisms.. |
| 65. | N. Ikegaya, K. Nagata, C. Hirose, J. Tanimoto, Effect of artificial speed of sound in ACM, EDACM, and EMV for two-dimensional cavity flow, Computers & Fluids, 10.1016/j.compfluid.2023.105985, 264, 105985-105985, 2023.10, This study compared various numerical schemes that have been reported with the assumption that artificial compressibility aids in the realization of explicit fluid dynamics simulations for a two-dimensional cavity flow. Four artificial compressible schemes, the artificial compressible method (ACM), entropically dumped ACM (EDACM), explicit method with virtual particles (EMV), were compared with a conventional incompressible scheme (simplified marker and cell, SMAC). The purpose of the comparisons is clarifying the validity of EMV in which the artificial speed of sound can be theoretically determined. In addition, the effect of the artificial speed of sound was investigated for ACM and compared with EMV. Moreover, three conditions of Reynolds numbers, Re=100, 1000, and 5000, were employed. Under steady-state conditions, the velocity and pressure distributions were found to be consistent among the EMV, ACM, EDACM, and SMAC. Further, the comparisons of the horizontal and vertical profiles indicated that these artificial compressible schemes reproduced the velocities using the incompressible scheme at three Reynolds numbers. In contrast, the temporal development of the velocity fields in the three artificial compressible schemes clearly exhibited small fluctuations in the velocity and pressure around the overall trends determined by SMAC. Further, the power spectral densities demonstrated that such fluctuations were due to compression-wave propagations with the artificial speed of sound. Although no clear differences were observed among EMV, ACM, and EDACM at these Reynolds numbers, EMV was determined to be advantageous in terms of theoretically determining the unique value of the artificial speed of sound once the lattice-grid system was fixed, whereas ACM and EDACM require sensitivity studies to select suitable values.. |
| 66. | Md. Anowar Hossain, Jun Tanimoto, Diverse reactivity model for traffic flow dynamics in Eulerian scope, NONLINEAR DYNAMICS, 10.1007/s11071-023-08734-x, 111, 18, 17369-17378, 2023.09, In this study, a new continuum traffic model is established in consideration of the diverse reactivity effect that emerges from driving attention and the vehicle's inertia. To instigate this diverse reactivity effect, two new functions are introduced, namely a driver's sensitivity function relying on the flow field's instantaneous density that follows a reverse tendency of optimal velocity function and an inertial equilibrium velocity function assuming the vehicle's inertia coefficient. Comparative analysis is performed using the proposed model and the conventional full velocity difference model. To ascertain the flow field neutralization capability of this model, a neutral stability analysis and the attendant neutral stability condition are derived. The complex behavior of the model near the critical point is investigated via nonlinear analysis, and the wavy solution of the Korteweg-de Vries-Burgers equation is obtained. To verify the analytical solution, a numerical simulation is performed, with the results demonstrating excellent agreement with the obtained theoretical results.. |
| 67. | Junya Masaka, Fumi Sueyoshi, Md Anowar Hossain, Shinobu Utsumi, Jun Tanimoto, Can the introduction of CAVs mitigate social dilemmas causing traffic jams on highways?, Physics Open, 10.1016/j.physo.2023.100176, 17, 2023.12, This study explored whether the introduction of connected automated vehicles (CAVs) into human-driven vehicles (HVs) can mitigate the social dilemma caused by defective HVs that seek to overtake other vehicles by making frequent lane changes. In this regard, a cellular automata traffic model based on the revised S–NFS model, dealing with a mixed flow field composed of CAVs and HVs with multiple lanes, was established. We perused precise game theoretical analysis on the basis of the result obtained from traffic flow analysis through multi-agent simulation (MAS). As a result, the social efficiency deficit, quantifying the extent of the social dilemma behind such a specific traffic flow system, elucidates that the introduction of CAVs does not eliminate the social dilemma caused by defective HVs unless CAVs account for the vast majority of the mixed flow.. |
| 68. | Zehua Si, Md Anowar Hossain, Jun Tanimoto, An improved microscopic traffic model for heterogeneous vehicles using the vehicle's mass effect, HELIYON, 10.1016/j.heliyon.2023.e16731, 9, 6, 2023.06, This study aims to develop a traffic model for heterogeneous vehicle movement, which introduces the vehicle's heterogeneity by considering the internal mass effect. We explore the behavioral characteristics of the flow field generated by the proposed model and provide a comparative analysis of the conventional model. A linear stability condition is deduced to showcase the model's capacity to neutralize flow. Nonlinear analysis is employed to derive the modified Korteweg-de Vries (mKdV) equation and its corresponding analytical solution, enabling the observation of traffic flow behavior in proximity to the neutral stability condition. A numerical simulation is then conducted, considering cyclic boundary conditions. The results indicate that the mass effect tends to absorb traffic jams provided no time delay is imposed.. |
| 69. | K. M.Ariful Kabir, Murshed Ahmed Ovi, Solli Murtyas, Aya Hagishima, Jun Tanimoto, Acceptance and Willingness-to-Pay of Vaccine for COVID-19 in Asian Countries: A Hypothetical Assessment Survey, Evergreen, 10.5109/6792807, 10, 2, 617-625, 2023.06, Building on safety and broad acceptance of healthcare policy, we agree that human behavior is substantial because its success depends on an individual's contribution, ethnic, economic, and social status. We present three surveys testing this account for imminent hypothetical COVID-19 vaccines in Bangladesh, Indonesia, and Malaysia to study to find the acceptance and willingness-to-pay (WTP) for a vaccine in a social context. We used the contingent valuation (CV) method to estimate WTP in Bangladesh, Malaysia, and Indonesia. The statistical ANOVA estimation mode was supposed to measure the critical factors of vaccine acceptance and WTP for three vaccines and compare the associated characteristics with conventional epidemic vaccination models. The studies investigated how an individual's vaccination behavior depends on disease severity, geographical proximity, and socioeconomic similarity. Our results demonstrate that increasing vaccine uptake has a significant impact on vaccine efficacy and disease severity, while self-reported vaccine preferences were associated with factors such as lack of education and economic conditions.. |
| 70. | 木村 建一, 藤井 晴行, 谷本 潤, C-53 熱伝導方程式のFEMによる数値解の振動について, 学術講演会論文集, 10.18948/shasetaikai.1989.0_725, 725-728, 1989.10. |
| 71. | 谷本 潤, 木村 建一, 藤井 晴行, 4386 熱伝導方程式の空間離散化、時間離散化にクランク・ニコルソン差分を用いた場合の数値解の振動について, 学術講演梗概集. D, 環境工学, 1989, 771-772, 1989.09. |
| 72. | 萩島 理, 片山 忠久, 林 徹夫, 谷本 潤, 41120 樹木のある街路の熱環境予測 : [その7]十字街路の温熱快適性予測, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 1997, 255-256, 1997.07. |
| 73. | 谷本 潤, 林 徹夫, 片山 忠久, 萩島 理, C-11 多数室問題における冷房発停および窓開閉にマルコフモデルを適用した場合の熱負荷特性に関する研究, 学術講演会論文集, 10.18948/shasetaikai.1998.1.0_193, 10, 1, 193-196, 1998.07. |
| 74. | 河上 貴子, 片山 忠久, 林 徹夫, 谷本 潤, 萩島 理, 笠間 幹雄, 456 都市熱環境評価のための地表面からの蒸発量の簡易計算手法に関する研究 : その3 数値実験に基づく簡易モデルの特性比較(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 37, 221-224, 1998.03. |
| 75. | 笠間 幹雄, 片山 忠久, 林 徹夫, 谷本 潤, 萩島 理, 河上 貴子, 455 都市熱環境評価のための地表面からの蒸発量の簡易計算手法に関する研究 : その2 土壌シリンダー実験に基づく蒸発特性の詳細な検討(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 37, 217-220, 1998.03. |
| 76. | 萩島 理, 片山 忠久, 林 徹夫, 谷本 潤, 454 建築-都市-土壌連成系モデルによる都市高温化予測(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 37, 213-216, 1998.03. |
| 77. | 片多 奈津子, 片山 忠久, 林 徹夫, 谷本 潤, 萩島 理, 植松 史博, 444 都市内外における乱流輸送量に関する研究 : (その2)乱流輸送量に関する諸検討(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 37, 173-176, 1998.03. |
| 78. | 植松 史博, 片山 忠久, 林 徹夫, 谷本 潤, 萩島 理, 片多 奈津子, 443 都市内外における乱流輸送量に関する研究 : (その1)測定概要および測定基本データ(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 37, 169-172, 1998.03. |
| 79. | 石倉 昌幸, 片山 忠久, 林 徹夫, 谷本 潤, 萩島 理, 435 実大模型室を用いた窓面伝熱機構の解析 : その4 建築外壁性能試験装置を用いた実験(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 37, 137-140, 1998.03. |
| 80. | 谷本 潤, 片山 忠久, 林 徹夫, 萩島 理, 434 都市舗装面における蒸発冷却効果を利用した保水性パッシブクーリング・レンガの開発 : その2 吸放湿実験(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 37, 133-136, 1998.03. |
| 81. | 笠間 幹雄, 片山 忠久, 林 徹夫, 谷本 潤, 萩島 理, 河上 貴子, 41065 都市熱環境評価のための地表面からの蒸発量の簡易計算手法に関する研究 : その5 重力透水, 水分拡散の影響を考慮した簡易計算手法の検討, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 1998, 129-130, 1998.07. |
| 82. | 河上 貴子, 片山 忠久, 林 徹夫, 谷本 潤, 萩島 理, 笠間 幹雄, 41064 都市熱環境評価のための地表面からの蒸発量の簡易計算手法に関する研究 : その4 土壌種による蒸発特性の実験的検討, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 1998, 127-128, 1998.07. |
| 83. | 谷本 潤, 片山 忠久, 林 徹夫, 萩島 理, 41063 都市舗装面における蒸発冷却効果を利用した保水性パッシブクーリング・レンガの開発, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 1998, 125-126, 1998.07. |
| 84. | 片多 奈津子, 片山 忠久, 林 徹夫, 谷本 潤, 萩島 理, 植松 史博, 41059 都市内外における乱流輸送量に関する実測研究 : その2 乱流輸送量に関する諸検討, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 1998, 117-118, 1998.07. |
| 85. | 植松 史博, 片山 忠久, 林 徹夫, 谷本 潤, 萩島 理, 片多 奈津子, 41058 都市内外における乱流輸送量に関する実測研究 : その1 測定概要および測定基本データ, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 1998, 115-116, 1998.07. |
| 86. | 石倉 昌幸, 林 徹夫, 片山 忠久, 谷本 潤, 萩島 理, 41015 ブラインドを含む窓面伝熱機構の解析 : その6 実大模型室を用いた空調時の実験, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 1998, 29-30, 1998.07. |
| 87. | 萩島 理, 片山 忠久, 林 徹夫, 谷本 潤, 40322 建築-都市-土壌連成系モデルによる都市高温化予測(その2)(都市熱環境), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 1998, 673-674, 1998.07. |
| 88. | 谷本 潤, 萩島 理, 片山 忠久, 都市高温化予測評価ツールとしての建築―都市―土壌連成系モデル, 九州大学大学院総合理工学報告, 10.15017/17479, 20, 4, 329-334, 1999.03, Significant air temperature rising in urban areas is well recognized as so-called Heat Island phenomenon in a global scale. It is qualitatively grasped that increase of anthropologic heat and alternation of land usage are regarded as its main reasons. To analyze quantitatively on factors of the significant air temperature rising, Architecture-Urban-Soil Simultaneous Simulation Model (AUSSSM) was proposed as a predicting methodology by authors in former studies. In this paper several sub-models to attach AUSSSM were reported in order to revise and improve its performance as a numerical predicting simulator. A new sub-model supported by a series of experimental data for practical prediction of evaporative rate from earth surface was introduced. Additionally, an original new sub-model was presented to estimate transient evaporative cooling effect on artificial covering such as building surface, asphalt pavement and so forth. These revisions will lead AUSSM to less erroneous significantly.. |
| 89. | 南雲 基予子, 片山 忠久, 谷本 潤, 萩島 理, E-45 調湿設計における室内吸放湿体の湿気特性 : 一次元壁体法とレスポンスファクタ法の比較, 学術講演会論文集, 10.18948/shasetaikai.1999.3.0_1469, 11, 3, 1469-1472, 1999.08. |
| 90. | 冨尾 眞紀, 片山 忠久, 谷本 潤, 萩島 理, D-44 都市舗装面における蒸発冷却効果を利用したパッシブクーリング・レンガの開発 : 暴露後の吸放湿実験と表面温度の変化特性, 学術講演会論文集, 10.18948/shasetaikai.1999.3.0_1405, 11, 3, 1405-1408, 1999.08. |
| 91. | 堤 純一郎, 新川 亮樹, 片山 忠久, 谷本 潤, 萩島 理, 479 戸建て住宅における通風に関する実測調査(その1)(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 38, 313-316, 1999.03. |
| 92. | 萩島 理, 片山 忠久, 谷本 潤, 森竹 千景, 大原 健志, 454 建築-都市-土壌連成系モデルへの接続を前提とした1次元都市キャノピーモデルの検証 : (その2)等温場における3次元乱流数値計算との比較(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 38, 213-216, 1999.03. |
| 93. | 森竹 千景, 片山 忠久, 谷本 潤, 萩島 理, 大原 健志, 453 建築-都市-土壌連成系モデルへの接続を前提とした1次元都市キャノピーモデルの検証 : (その1)等温場における風洞模型実験との比較(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 38, 209-212, 1999.03. |
| 94. | 河上 貴子, 片山 忠久, 谷本 潤, 萩島 理, 452 都市熱環境評価のための地表面からの蒸発量の簡易計算手法に関する研究 : その6 穴開き土壌シリンダー実験に基づく改良モデルの提案(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 38, 205-208, 1999.03. |
| 95. | 香川 治美, 片山 忠久, 谷本 潤, 萩島 理, 451 土壌内水分移動特性に関するパラメータの推定 : 土壌内の熱水分同時移動現象の解析(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 38, 201-204, 1999.03. |
| 96. | 西山 貴志, 片山 忠久, 谷本 潤, 萩島 理, 447 緑被SAT計の試作およびその基本特性(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 38, 185-188, 1999.03. |
| 97. | 植松 史博, 片山 忠久, 谷本 潤, 萩島 理, 柴原 朋広, 西山 貴志, 446 草地,裸地における地表面熱収支および乱流輸送量の長期実測(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 38, 181-184, 1999.03. |
| 98. | 月松 孝司, 片山 忠久, 谷本 潤, 萩島 理, 445 建築-都市-土壌連成系モデルへの接続を前提とした人工被覆蒸発比サブモデルに関する研究(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 38, 177-180, 1999.03. |
| 99. | 冨尾 眞紀, 片山 忠久, 谷本 潤, 萩島 理, 444 都市舗装面における蒸発冷却効果を利用した保水性パッシブクーリング・レンガの開発 : その3 海水含浸レンガの吸放湿実験(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 38, 173-176, 1999.03. |
| 100. | 南雲 基予子, 片山 忠久, 谷本 潤, 萩島 理, 443 室内吸放湿体の湿気特性に関する実験 : 紙、書籍類の吸放湿実験(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 38, 169-172, 1999.03. |
| 101. | 石倉 昌幸, 林 徹夫, 片山 忠久, 谷本 潤, 萩島 理, 433 実大模型室を用いた窓面伝熱機構の解析 : その5 内ブラインドにおける放射と換気の連成シミュレーション(環境工学), 日本建築学会研究報告. 九州支部. 2, 環境系, 38, 129-132, 1999.03. |
| 102. | 萩島 理, 片山 忠久, 谷本 潤, 41342 建築・都市・土壌連成系モデル接続のための1次元大気サブモデルに関する考慮, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 1999, 683-684, 1999.07. |
| 103. | 森竹 千景, 片山 忠久, 谷本 潤, 萩島 理, 大原 健志, 41258 風洞模型実験による街路の抵抗係数の同定 : AUSSSM中の1次元キャノピーモデルの検証, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 1999, 515-516, 1999.07. |
| 104. | 月松 孝司, 片山 忠久, 谷本 潤, 萩島 理, 41157 降水後の人工被覆面における蒸発比減衰モデルの提案 : AUSSSM人工被覆サブモデル, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 1999, 313-314, 1999.07. |
| 105. | 香川 治美, 片山 忠久, 谷本 潤, 萩島 理, 41127 土壌内水分移動特性に関するパラメータの同定と自然地被面からの蒸発潜熱量および土壌含水率の予測, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 1999, 253-254, 1999.07. |
| 106. | 河上 貴子, 片山 忠久, 谷本 潤, 萩島 理, 41126 都市熱環境評価のための地表面からの蒸発量の簡易計算手法に関する研究 : その7 穴開きシリンダーモデルの提案, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 1999, 251-252, 1999.07. |
| 107. | 植松 史博, 片山 忠久, 谷本 潤, 萩島 理, 40348 渦相関法による自然地被面の乱流熱輸送量に関する実測 : その2 乱流熱輸送量に関する諸検討, 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 1999, 733-734, 1999.07. |
| 108. | 片山 忠久, 谷本 潤, 萩島 理, 植松 史博, 40347 渦相関法による自然地被面の乱流熱輸送量に関する実測 : その1 測定方法および測定結果の概要, 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 1999, 731-732, 1999.07. |
| 109. | 谷本 潤, 萩島 理, 片山 忠久, 高保水性パッシブクーリングレンガの開発, 日本建築学会技術報告集 : journal of architecture and building science, 115, 1464, 135-138, 2000.12, To obtain significant evaporative cooling effect derived from enhanced water content rate, development of passive cooling bricks impregnated with chlorides was attempted. Fundamental concept, chloride impregnation into the base materials, is come from the former presented study which was a specific idea for the efficient humidity regulation material as an indoor finishing. The results of experiments indicate that chloride impregnation leads to marvelous capacity of water content, even though some extent of that characteristic is going to be lost after many days exposure to dynamic outdoor condition. In the dissemination point of view, seawater is confirmed to be applicable as a chloride source. In some specific cases, surface temperature of the chloride-impregnated brick during its transient evaporation is observed relatively high than usual evaporation, which is considered as a particular chemical influence. So then, this presented idea requires a careful design with respect to where that is applied to and what kind of chloride is impregnated.. |
| 110. | 萩島 理, 谷本 潤, 片山 忠久, 西山 貴志, 草地における対流熱伝達率と熱収支に関する長期実測, 日本建築学会技術報告集 : journal of architecture and building science, 115, 1464, 155-159, 2000.12, Field measurement focusing on heat balance at grassland was performed for five months. Following phenomenon were observed. ・ In summer season, surface temperature of leaf tip increases with increase of the amount of incident solar radiation more clearly than in other season. ・ Bowen ratio decreases with increase of water content of soil surface. ・ Bowen ratio of winter is bigger than that of autumn under the same water content of soil surface. ・ Mocked-up Grassland SAT-meters suggest that those shape and material of the imitative leaves are not so affective on the estimated heat transfer coefficient. ・ The heat transfer coefficient of the grassland obtained from the measurement data of heat flux and representative surface temperature of leaf tip seems to be inconsistent with that of Grassland SAT-meter.. |
| 111. | 谷本 潤, 萩島 理, 片山 忠久, 建築環境工学教育用コンピュータソフトウェアET AEEの開発, 日本建築学会技術報告集 : journal of architecture and building science, 115, 1464, 165-168, 2000.12, This paper reports on the development of ET_AEE, which is an acronym of Educational Tools for Architectural Environment Engineering. ET AEE is a new educational-tool program that calculates several tasks related to the topics of Architectural Environment Engineering aiming at undergraduate students. However, ET_AEE probably seems to be much useful and powerful not only for undergraduate students but also for graduate students, engineers and researchers. ET_AEE provides above-mentioned calculations on a userfriendly interface, in other words, Graphical User Interface, GUI, which works on the plat form of Windows 95, Windows 98 or Windows NT. ET_AEE is free software, so then, anyone can download the installation file from the web-site of authors, http : //ktlabo.cm.kyushu-u.ac.jp/. Calculating functions provided by ET_AEE are totally 12 that are classified into 2 parts, Engineering Issues and Mathematical Issues. ET_AEE provides a separete dialog box for each calculation topic that was designed to be cool and easy understanding considering GUI. One of the specific features to be stressed is that ET_ AEE has a huge Help file using a bunch of image files, which is very useful and helpful.. |
| 112. | 萩島 理, 谷本 潤, 片山 忠久, F-37 草地における熱収支と対流熱伝達率に関する長期実測, 学術講演会論文集, 10.18948/shasetaikai.2000.2.0_1057, 12, 2, 1057-1060, 2000.08. |
| 113. | 谷本 潤, 萩島 理, 片山 忠久, 黒川 恵見, F-36 建築-都市-土壌連成系モデル(AUSSSM)へ接続する建築空調設備システムの取り扱いについて, 学術講演会論文集, 10.18948/shasetaikai.2000.2.0_1053, 12, 2, 1053-1056, 2000.08. |
| 114. | 大原 健志, 片山 忠久, 谷本 潤, 萩島 理, 488 数値実験による土壌蒸発量簡易予測モデルの物性値同定, 日本建築学会研究報告. 九州支部. 2, 環境系, 39, 349-352, 2000.03. |
| 115. | 月松 孝司, 片山 忠久, 谷本 潤, 萩島 理, 487 降水後の人工被覆面における蒸発比減衰モデルの提案 : (その2)アスファルト舗装面及びアスファルトシート防水面における実測, 日本建築学会研究報告. 九州支部. 2, 環境系, 39, 345-348, 2000.03. |
| 116. | 南雲 基予子, 片山 忠久, 谷本 潤, 萩島 理, 486 室内吸放湿体の熱湿気特性に関する研究 : 事務室机上紙類の吸放湿特性, 日本建築学会研究報告. 九州支部. 2, 環境系, 39, 341-344, 2000.03. |
| 117. | 萩島 理, 片山 忠久, 谷本 潤, 469 建築-都市-土壌連成系モデルへの接続を前提とした1次元都市キャノピーモデルの検証 : (その3)街路における非等温時の3次元乱流数値計算, 日本建築学会研究報告. 九州支部. 2, 環境系, 39, 273-276, 2000.03. |
| 118. | 冨尾 眞紀, 片山 忠久, 谷本 潤, 萩島 理, 458 街路空間におけるパッシブクーリング手法の適用可能性に関する検討, 日本建築学会研究報告. 九州支部. 2, 環境系, 39, 229-232, 2000.03. |
| 119. | 谷本 潤, 片山 忠久, 萩島 理, Douglas Balcomb, 423 Computer program MCDM-23 : Multi-Criteria Decision-Making Toolの概要, 日本建築学会研究報告. 九州支部. 2, 環境系, 39, 89-92, 2000.03. |
| 120. | 西山 貴志, 片山 忠久, 谷本 潤, 萩島 理, 416 草地における地表面熱収支と対流熱伝達率に関する実測研究, 日本建築学会研究報告. 九州支部. 2, 環境系, 39, 61-64, 2000.03. |
| 121. | 大原 健志, 片山 忠久, 谷本 潤, 萩島 理, 41169 数値実験による土壌蒸発量簡易予測モデルの物性値同定 : AUSSSMサブモデル, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2000, 347-348, 2000.07. |
| 122. | CHIMKLAI Parichart, 片山 忠久, 谷本 潤, 萩島 理, 40605 省エネルギービル設計代替案意思決定支援ツールMCDM-23に関する検討, 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2000, 1223-1224, 2000.07. |
| 123. | 谷本 潤, 片山 忠久, 萩島 理, 40604 建築環境工学教育用コンピュータソフトウェアET_AEEの開発概要, 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2000, 1221-1222, 2000.07. |
| 124. | 萩島 理, 谷本 潤, 片山 忠久, 524 周辺建物が建物熱負荷に与える影響の定量化に関する研究, 日本建築学会研究報告. 九州支部. 2, 環境系, 40, 493-496, 2001.03. |
| 125. | 月松 孝司, 片山 忠久, 谷本 潤, 萩島 理, 523 屋上スラブ面における対流熱伝達率に関する実験的研究, 日本建築学会研究報告. 九州支部. 2, 環境系, 40, 489-492, 2001.03. |
| 126. | パリチャート シムクライ, 片山 忠久, 谷本 潤, 萩島 理, 495 省エネルギービル設計代替案意志決定支援ツールMCDM-23の開発, 日本建築学会研究報告. 九州支部. 2, 環境系, 40, 377-380, 2001.03. |
| 127. | 内丸 真吾, 片山 忠久, 谷本 潤, 萩島 理, 494 システムダイナミクスに基づく広域環境の動態予測, 日本建築学会研究報告. 九州支部. 2, 環境系, 40, 373-376, 2001.03. |
| 128. | 宮原 直枝, 片山 忠久, 谷本 潤, 萩島 理, 483 建築-都市気候モデルに用いる3次元プラットホームデータの構築に関する研究 : その1 排熱3次元分布特性調査と都市形状解析, 日本建築学会研究報告. 九州支部. 2, 環境系, 40, 329-332, 2001.03. |
| 129. | 大原 健志, 片山 忠久, 谷本 潤, 萩島 理, 482 建築-都市-土壌連成系モデルによる都市高温化予測に関する研究 : (その1)計算手法と基準解, 日本建築学会研究報告. 九州支部. 2, 環境系, 40, 325-328, 2001.03. |
| 130. | 萩島 理, 片山 忠久, 谷本 潤, 41021 周辺建物が建物壁面入射日射量に与える影響に関する数値実験(熱負荷(1),環境工学II), 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2001, 41-42, 2001.07. |
| 131. | シムクライ パリチャート, 片山 忠久, 谷本 潤, 萩島 理, 40486 省エネルギービル設計代替案意志決定支援ツールMCDM-23に関する開発(環境評価手法,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2001, 989-990, 2001.07. |
| 132. | 大原 健志, 片山 忠久, 谷本 潤, 萩島 理, 40363 建築-都市-土壌達成系モデルによる都市高温化予測に関する研究 : (その2)数値実験による都市高温化の定量的要因解析(空調エネルギーと都市熱環境,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2001, 743-744, 2001.07. |
| 133. | 宮原 直枝, 片山 忠久, 谷本 潤, 萩島 理, 40362 建築-都市気候モデルに用いる3次元プラットホームデータの構築に関する研究 : その2 空調システム実態調査(空調エネルギーと都市熱環境,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2001, 741-742, 2001.07. |
| 134. | 月松 孝司, 片山 忠久, 谷本 潤, 萩島 理, 40356 建築外表面の対流熱伝達率に関する実験的研究(屋上緑化・クールアイランド,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2001, 729-730, 2001.07. |
| 135. | 内丸 真吾, 片山 忠久, 谷本 潤, 萩島 理, 11028 システムダイナミクスに基づく広域環境の動態予測(シミュレーション・数理計画・数理統計(1),情報システム技術), 学術講演梗概集. A-2, 防火,海洋,情報システム技術, 2001, 397-398, 2001.07. |
| 136. | 執行 亮吉, 片山 忠久, 谷本 潤, 萩島 理, 都市キャノピー構成面の日射反射率に関する調査研究(2002年度大会 (北陸) 学術講演梗概集), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2002, 665-666, 2002.06. |
| 137. | 執行 亮吉, 片山 忠久, 谷本 潤, 萩島 理, 調査と実測に基づく都市キャノピー内日射反射率特性, 日本建築学会研究報告. 九州支部. 2, 環境系, 41, 357-360, 2002.03. |
| 138. | 宮原 直枝, 片山 忠久, 谷本 潤, 萩島 理, 建築-都市気候モデルに用いる3次元プラットホームデータの構築に関する研究 : その3 都市形状調査と建物形状調査, 日本建築学会研究報告. 九州支部. 2, 環境系, 41, 349-352, 2002.03. |
| 139. | シムクライ パリチャート, 片山 忠久, 谷本 潤, 萩島 理, 建築-都市-土壌連成系モデルに基づく都市高温化予測評価AUSSSM T00Lの開発(2002年度大会 (北陸) 学術講演梗概集), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2002, 889-890, 2002.06. |
| 140. | 熊本 健, 片山 忠久, 谷本 潤, 萩島 理, 地域特性を考慮した建築解体廃棄物の発生量および最終処分量の将来予測 : 福岡県97市町村における推計, 日本建築学会研究報告. 九州支部. 2, 環境系, 41, 353-356, 2002.03. |
| 141. | 松嶋 篤, 片山 忠久, 成田 健一, 谷本 潤, 萩島 理, 三坂 育正, ステップガーデンを有する建物とその周辺市街地の熱環境実測, 日本建築学会研究報告. 九州支部. 2, 環境系, 0, 41, 329-332, 2002.03. |
| 142. | 尾之上 真弓, 成田 健一, 三坂 育正, 片山 忠久, 谷本 潤, 萩島 理, ステップガーデンを有する建物とその周辺市街地の熱環境に関する実測と研究 : -その2-熱収支の解析結果(2002年度大会 (北陸) 学術講演梗概集), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2002, 0, 685-686, 2002.06. |
| 143. | 松嶋 篤, 片山 忠久, 成田 健一, 谷本 潤, 萩島 理, 三坂 育正, ステップガーデンを有する建物とその周辺市街地の熱環境に関する実測研究 : -その1-測定概要とステップガーデン内外の温度分布特性(2002年度大会 (北陸) 学術講演梗概集), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2002, 0, 683-684, 2002.06. |
| 144. | 内丸 真吾, 片山 忠久, 谷本 潤, 萩島 理, システムダイナミクスに基づく広域環境の動態予測 その3 : 改良モデルの概要, 日本建築学会研究報告. 九州支部. 2, 環境系, 41, 269-272, 2002.03. |
| 145. | 高尾 京子, 片山 忠久, 谷本 潤, 萩島 理, コケを用いた軽量壁面緑化パネルの開発 : 第1報 緑化パネルの蒸発特性及び日射反射率(2002年度大会 (北陸) 学術講演梗概集), 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2002, 559-560, 2002.06. |
| 146. | 萩島 理, 片山 忠久, 谷本 潤, 高尾 京子, コケを用いた軽量壁面緑化パネルの開発 : 第2報 緑化パネルの熱コンダクタンス測定及び都市キャノピーモデルによる数値計算(2002年度大会 (北陸) 学術講演梗概集), 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2002, 561-562, 2002.06. |
| 147. | 萩島 理, 谷本 潤, 高尾 京子, コケを用いた軽量緑化パネルの開発, 九州大学大学院総合理工学報告, 10.15017/16670, 24, 3, 297-303, 2002.12, First, the authors reported the outline of development of the wall unit system covered with moss plant. Since the adopted species of moss requires not the soil but the perforated materials for fixing with rhizoid, it may be possible to decrease the weight of wall green system. The five types of moss panel, which have different basal materials, were exposed under the natural condition for more than six months in order to confirm the growing process. Second, to grasp the features of evaporation, thermal conductance and solar reflectivity of moss panel, they conducted the several experiments. At last, numerical simulation based on the urban canopy model, which contains the sub model for estimating the thermal effect of moss panel based on the experiment, were performed. The calculation results implied that the maximum temperature of the wall surface and urban air in hot summer decrease by about 7 degree and 0.3 degree respectively.. |
| 148. | 藤井 晴行, 谷本 潤, 複雑系科学に基づく環境共生型持続社会システムの探究 : 室内温熱環境調整行動が広域環境システムに及ぼす影響のシミュレーション, 総合論文誌, 1, 116-122, 2003.02, The authors assume that it is necessary to find a set of solutions to the crucial issues concerning the relation between the global environment and the sustainable human society. On the basis of the assumption, the authors have been developing a human-environment-society system model to simulate the characteristic phenomena related to the issue. This paper explains the framework of the model focusing on a social dilemma in indoor climate control, where actions performed with expectation to make individual's indoor thermal environment comfortable bring about undesired environment against the expectation. Some results of the case study simulations to find some crews to deal with the social dilemma are also shown.. |
| 149. | 谷本 潤, 萩島 理, 三浦 泰久, 複雑系モデルによるアカデミックソサエティの盛衰予測研究に関する考察 : 大学教官の研究、教育に対する意識構造, 九州大学大学院総合理工学報告, 10.15017/16678, 24, 4, 337-341, 2003.03, This report is in the sequence of authorsformer works about ups-and downs prospect of academic society based on the complexity modeL A field survey using questionnaire technique was conducted in"K" University to grasp the conscience structure of professors in terms of their research and educational activities． Results include several interesting implications．. |
| 150. | 高園 洋行, 谷本 潤, 萩島 理, 空港整備事業に対する住民ニーズの評価, 九州大学大学院総合理工学報告, 10.15017/16693, 25, 2, 215-219, 2003.09, Demands to public investment for infrastructure have a wide variety of facets today and a plan should be made according to the public demand. While, the present Japan has a huge budget deficit reaching to 700 trillion yen. This forces us to avoid throwing away the national wealth. Due to this social background, a field survey using the Conjoint Analysis to obtain the utility structure for an airport was conducted. The result indicates MWTP (Marginal Willingness To Pay) concerning several factors such as access time, magnitude of the airport, noise annoyance and nature preservation. The access time has the largest MWTP, -1060.6 yen/minute. An estimation coming from the present survey implies that people are not totally willing to approve the New Fukuoka Airport Project, which compels the people long access time even with other benefits.. |
| 151. | 近藤 良久, 藤井 晴行, 谷本 潤, 環境問題の解決法のマルチエージェントシミュレーションによる模索, 電子情報通信学会技術研究報告. AI, 人工知能と知識処理, 102, 615, 35-40, 2003.01, 人間、環境、社会を相互に影響し合うひとつの系としてマルチエージェントシミュレーションを行う。環境との共生を可能にする環境デザインの方法の提案を最終目的とする。本稿はエージェントの態度と系の振舞いに注目する。. |
| 152. | 三浦 泰久, 谷本 潤, 藤井 晴行, 萩島 理, 持続可能型社会における経済システムに関する一考察 : マルチ・エージェント・シミュレーションによる人間-環境-社会システムの解析, 電子情報通信学会技術研究報告. AI, 人工知能と知識処理, 102, 615, 41-46, 2003.01, 3つの経済主体からなる経済システムを人工社会上に仮構した。本モデルに登場する3つの経済主体は政府、企業、消費者である。経済システムは動的マルチエージェントシステムである。モデルにおけるエージェントの学習には、ニューラルネットワークとGAを組み合わせたものを適用している。本モデルを用いて、数値実験を行い、その結果について考察を行った。. |
| 153. | 藤井 晴行, 谷本 潤, 地球環境と共生する持続的社会の探究 : 人間-環境-社会システムの計算モデル, 電子情報通信学会技術研究報告. AI, 人工知能と知識処理, 102, 615, 29-34, 2003.01, 地球環境と共生する持続的社会のあり方を模索するために、建築環境のシミュレーションモデル、行動モデル、社会システムのシミュレーションモデルを連成し、人間-環境-社会系モデルを構築中である。本稿は、建築環境、行動、社会システムを、それぞれ、伝熱の状態方程式、クラシファイアシステム、マルチエージェントシステムを用いて実装したシミュレーションモデルによる、いくつかのケーススタディについて報告する。. |
| 154. | 谷本 潤, 萩島 理, 内丸 真吾, 片山 忠久, システムダイナミクスに基づくグローバル広域環境の動態予測に関する一考察, 日本計算工学会論文集 = Transactions of the Japan Society for Computational Engineering and Science, 5, 107-116, 2003.05. |
| 155. | 谷本 潤, 藤井 晴行, ゲーム論から観た談合に関する小考, 電子情報通信学会技術研究報告. AI, 人工知能と知識処理, 102, 614, 1-3, 2003.01, 本稿では,先ずゲーム論における利得行列に関する定性的考察からカルテルと談合の差異について論究した.得られる利得により,ゲームの様相は,鹿狩りゲーム,囚人のジレンマとなる.このことを基に談合防止の為に講ずべき手だてについて述べた.. |
| 156. | Chimklai Parichart, Hagishima Aya, Tanimoto Jun, Systematic Numerical Experiments for Investigation of Urban Albedo Characteristics, 九州大学大学院総合理工学報告, 10.15017/16692, 25, 2, 207-214, 2003.09, One of the important parameters used to estimate Urban Heat Island that involved with mesoscale model is albedo. It is useful to reliably investigate the energy budget in an urban through the radiation exchange study within urban canopy. In order to systematically clarify the urban albedo characteristics coupling with that of factorial effects, we introduce an Albedo Calculation Model, which is simple and more reliable to provide the 3-dimensional urban albedo simulation. In addition, the numerical experiment based on the model was carried out for supplementary explanation of how the significant factors affect albedo characteristics. In this paper, the principle of Albedo Calculation Model and associated numerical experiment results are obviously described.. |
| 157. | 谷本 潤, 萩島 理, MCDMを適用した環境共生建築のためのワークショップ/標準設計演習スキームの構成に関する提案 : 第1報 MCDMの住宅案選択への試行的適用, 日本建築学会技術報告集 : journal of architecture and building science, 18, 197-202, 2003.12, This study targets on a challenge to build some sort of de facto standard program for design training class in a university where the environmental conscious concept aiming sustainable design is strongly emphasized. MCDM, developed in the circle of TEA SHCP Task 23, is embedded in the program to support students' decision-making process. This paper reports on our first step. A field survey, where students studying architecture and professors in a certain university are involved as samples, was conducted shedding some light on how to apply MCDM in case of selecting process for dwellings. The result implies, for example, that there is a difference on how important among decision-making criteria depending upon how to be inquired.. |
| 158. | Chimklai Parichart, Tanimoto Jun, Hagishima Aya, Development of Intelligent Computer Software (AUSSSM TOOL) to Estimate the Urban Heat Island Efffects, 九州大学大学院総合理工学報告, 10.15017/16679, 24, 4, 343-350, 2003.03, The computer software AUSSSM TOOL, originating from the methodology of the revised- Architectural-Urban-Soil-Simultaneous Simulation Model (revised-AUSSSM), was developed by adopting the Graphical User Interface (GUI) features to support users, who can use the interactive computer display for parameter settings, simulating, visualizing, and reporting the numerical calculation results instead of complicated programming. The purpose of the AUSSSM TOOL is to determine quantitative parameters such as air temperature, exhaustive heat from air conditioning systems, and etc. within the Urban Canopy structure, which data enables the evaluation of effects of Urban Heat Island (UHI) useful to urban planners, architects, engineers, and so forth in the field of urban climatology involving building scale. In addition to conducting a fu11 numerical simulation, in order to simplify a comparison among complex factors influencing UHI, numerical experiments based on Taguchi Design of Experiment theory (DOE) were carried out. The results of the numerical experiments were stored in a database and ready to be instantly grasped by any inexperienced user corresponding to their specified conditions. This paper describes the fundamental method of the revised-AUSSSM, the structures of the AUSSSM TOOL, and the techniques comprising its algorithm to present the numerical simulation results in particular.. |
| 159. | 高尾 京子, 谷本 潤, 萩島 理, B-49 ヒートアイランドのパッシブコントロール手法としての軽量壁面緑化コケパネルの開発 : 新しい基盤材の検討及び熱特性の把握, 学術講演会論文集, 15, 3, 1429-1432, 2003.08. |
| 160. | J Tanimoto, H Fujii, A study on research performance in Japanese Universities: Which is more efficient - A professor who is leading his research group or one who is working alone? The multi-agent simulation knows, ADVANCES IN COMPLEX SYSTEMS, 6, 3, 375-391, 2003.09, In recent years, we have been interested in the up-and-down prospects of academic societies, including both universities and academies. We we have developed a University-Academy Coupling Model, which is built on the multi-agent simulation technique. In the artificial society, there exist both funding and "research seeds" that are requisite simultaneously for researchers to survive. The "seed" means a clue, source or new topic for his research activity. This paper focuses on how different efficiencies are observed in different types of organizing processes or personnel systems for research activity in universities.. |
| 161. | シムクライ パリチャート, 萩島 理, 谷本 潤, 41014 A Development of Web Application to Identify the Urban Canopy Albedo : Part1:Model Algorism and its Validation, 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2003, 27-28, 2003.07. |
| 162. | 谷本 潤, 萩島 理, 依田 浩敏, 40512 MCDMを適用した環境共生建築のためのワークショップ/標準設計演習スキームの構成に関する研究 : 第1報 住宅案選択への適用事例(環境設計支援,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2003, 1039-1040, 2003.07. |
| 163. | 三坂 育正, 成田 健一, 谷本 潤, 萩島 理, 40334 ステップガーデンを有する建物とその周辺市街地の熱環境に関する実測研究 : その3 気流可視化と長期測定による冷気流の出現特性(都市・建物緑化,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2003, 0, 683-684, 2003.07. |
| 164. | 前田 和成, 萩島 理, 谷本 潤, 数値計算による炭化物を用いたパッシブ調湿システムに関する検討, 九州大学大学院総合理工学報告, 10.15017/16727, 26, 2, 209-213, 2004.09, A passive dehumidifier system utilizing charcoal chips produced from construction wastes was proposed. The most important point is that the system contains a regenerating cycle for vapor absorbed charcoal chips, which was comes form an expanded idea on Trombe Wall System. The system consists of a charcoal chips board, which is externally covered by a glass skin with a small air space. There are two ventilation paths either from a room to room or from an outside air to outside, which may be supported by mechanical fans. The former path is for the dehumidifying mode, when the charcoal chips board effectively absorbs room air vapor. Whereas, the latter is for the regenerating mode during daytime, when the solar radiation can restore the charcoal chips board. The authors established a numerical model of this system on a basis of the simultaneous hygrothermal transfer equations. Obtained numerical result shows a practical feasibility of the system and helps for a primary design under various situations.. |
| 165. | Jing Liu, Yuemei Zhu, Aya Hagishima, Jun Tanimoto, Hiroshi Yoshino, Numerical Simulation on Outdoor Thermal Comfort Using Revised AUSSSM Model, The 3rd International Workshop on Energy and Environment of Residential Buildings, 185-190, 2004.11. |
| 166. | Aya Hagishima, Aya Hagishima, Ken Ichi Narita, Jun Tanimoto, Field experiment on the oasis effect of urban areas using potted plants, 5th Symposium on the Urban Environment, 243-245, 2004.12, An experimental study, using potted plants was, conducted to estimate the oasis effects of urban areas. The study for 28 days shows that evaporation rate of an isolated plant is one-and-half times larger than that of plant placed in the center of a dense canopy. The experiment was accompanied by noting the evaporation rate of 55 potted plants, arranged at an interval of 3.6 meters. It was observed that evaporation rate increased with an decrease in the vegetation density.. |
| 167. | Aya Hagishima, Aya Hagishima, Jun Tanimoto, Ken Ichi Narita, Comparisons of various experimental results on the convective heat transfer coefficient of urban surfaces, 5th Symposium on the Urban Environment, 647-648, 2004.12, A comparative study on experimental results obtained on the convective heat transfer coefficients on urban surfaces are discussed. Convective heat transfer coefficient (CHTC) was considered to express the turbulent heat exchange between the atmosphere and urban surfaces. A detailed study on relationship between CHTC of vertical wall of buildings and wind speeds, and CHTC for horizontal building roofs and wind speeds, was also presented. It was observed that position of walls has relatively large influence on CHTC.. |
| 168. | 相良 博喜, 谷本 潤, 萩島 理, C-20 エネルギー計算に用いる生活スケジュールに関する研究 : 普遍的発生法の基礎的検討, 学術講演会論文集, 16, 1, 229-232, 2004.08, A probabilistic method to generate a number of individual daily life-schedules was established, which seems to be useful in a set of calculations of various energy peak loads, including not only cooling or heating requirements but also domestic hot water even electric power and natural gas demand. Authors* previous work was a particular method that was only applicable to a dataset of Working Male on Weekdays. The method this time, however, can be applied to all the dataset. That is why it is called as universal. The accuracy of the proposed method was also identified.. |
| 169. | 萩島 理, 谷本 潤, 高園 洋行, 40523 環境性能を考慮した建築物の総合評価のための重み決定法に関するアンケート調査(環境性能評価,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2004, 1069-1070, 2004.07. |
| 170. | 伊牟田 航生, 萩島 理, 谷本 潤, 成田 健一, 40352 ろ紙蒸発法に基づく平滑濡れ面の伝達率測定 : オアシス効果に関する野外実験(その2)(都市緑化(2),環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2004, 0, 727-728, 2004.07. |
| 171. | 高野 武将, 成田 健一, 萩島 理, 谷本 潤, 40351 都市域における樹木の蒸散特性 : オアシス効果に関する野外実験(その1)(都市緑化(2),環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2004, 0, 725-726, 2004.07. |
| 172. | 小川弘子, 菅原広史, 萩島理, 成田健一, 木村聖, 谷本潤, 神田学, 森脇亮, 建物群における熱フラックスと気流場の実測, 日本気象学会大会講演予稿集, 87, 415, 2005.04. |
| 173. | 小川弘子, 菅原広史, 萩島理, 成田健一, 木村聖, 谷本潤, 神田学, 森脇亮, 建物キャノピー内の気流場と風速プロファイル, 日本気象学会大会講演予稿集, 88, 433, 2005.10. |
| 174. | 小川 弘子, 菅原 広史, 萩島 理, 成田 健一, 木村 聖, 谷本 潤, 神田 学, 森脇 亮, P340 建物キャノピー内の気流場と風速プロファイル, 大会講演予講集, 88, 0, 2005.10. |
| 175. | 小川 弘子, 菅原 広史, 萩島 理, 成田 健一, 木村 聖, 谷本 潤, 神田 学, 森脇 亮, P308 建物群における熱フラックスと気流場の実測, 大会講演予講集, 87, 0, 2005.04. |
| 176. | 萩島 理, 谷本 潤, 成田 健一, 菅原 広史, 木村 聖, 40370 2次元都市キャノピー空間の気流性状及び熱収支に関する屋外観測 : 第2報 対流熱伝達率(キャノピー・スケールモデル,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2005, 0, 761-762, 2005.07. |
| 177. | 木村 聖, 萩島 理, 谷本 潤, 成田 健一, 菅原 広史, 40369 2次元都市キャノピー空間の気流性状及び熱収支に関する屋外観測 : 第1報 気流分布及び気温分布(キャノピー・スケールモデル,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2005, 0, 759-760, 2005.07. |
| 178. | 伊牟田 航生, 萩島 理, 谷本 潤, 都市表面物質伝達率測定を目的とした濾紙蒸発法の検証, 九州大学大学院総合理工学報告, 10.15017/14558, 28, 1, 31-33, 2006.07, An experiment to confirm how the Filter Paper's Evaporation Method (FPEM) works well as an appropriate estimation of Mass Transfer Coefficient (MTC), which has been applied by quite a few studies in urban climatology. In an experimental process of FPEM, a thick filter paper wetted enough is pasted onto an acrylic-plastic board so that is possible to measure an evaporation rate by the weight loss during an exposed minutes, which can be transformed into the MTC when you also measure the filter paper's surface temperature and air humidity. The key issue in FPEM is whether and how long a wet filter paper can keep its saturation during the exposed minutes, which is primarily focused in the present study. In the experiment, an evaporating amount from a flat-water surface is also measured, which is requisite to compare as the reference of a perfect saturated surface with the filter paper surface. To ensure accuracy, the exposed air is kept in calm and dry condition in the experiment. The result insists that we can see a filter paper as an almost perfect saturated surface unless the accumulated evaporation surpasses over 625 g/m^2.. |
| 179. | 成田 健一, 萩島 理, 谷本 潤, 高野 武将, 都市域における樹木の蒸散特性 : オアシス効果に関する野外実験, 日本建築学会環境系論文集, 0, 608, 59-66, 2006.10, Green space in an urban area has been expected to mitigate urban heat island. According to the recent study, the latent heat flux in urban area is larger than expected. In other words, we have to consider that trees in an urban area transpire more effective than that of vast forest area. The phenomenon that water demand of vegetations increases in the area surrounded by dry surface is generally called "oasis effect" in climatology. Above results imply that the oasis effect also exists for the roadside trees and the hedge in residential area. In this study, field experiments were performed i.... |
| 180. | 小川弘子, 菅原広史, 萩島理, 成田健一, 木村聖, 谷本潤, 神田学, 森脇亮, 都市キャニオンにおける風速プロファイル, 日本気象学会大会講演予稿集, 89, 128, 2006.04. |
| 181. | 菅原広史, 小川弘子, 萩島理, 成田健一, 谷本潤, 神田学, 森脇亮, 都市キャニオン内における建物高さスケールの渦の形成, 日本気象学会大会講演予稿集, 89, 401, 2006.04. |
| 182. | 菅原 広史, 小川 弘子, 萩島 理, 成田 健一, 谷本 潤, 神田 学, 森脇 亮, P334 都市キャニオン内における建物高さスケールの渦の形成, 大会講演予講集, 89, 0, 2006.04. |
| 183. | 小川 弘子, 菅原 広史, 萩島 理, 成田 健一, 木村 聖, 谷本 潤, 神田 学, 森脇 亮, B302 都市キャニオンにおける風速プロファイル(大気境界層), 大会講演予講集, 89, 0, 2006.04. |
| 184. | 永山 浩二, 萩島 理, 谷本 潤, 41396 複雑形状都市におけるバルク運動量輸送係数パラメタリゼーションのための風洞模型実験(市街地風環境, 環境工学II), 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2006, 809-810, 2006.07. |
| 185. | 萩島 理, 谷本 潤, 成田 健一, 40299 屋外都市スケールモデルCOSMOにおけるキャノピー内の温度場と気流場の観測(街路空間微気象, 環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2006, 0, 625-626, 2006.07. |
| 186. | 池谷直樹, 谷本潤, 萩島理, 相良博喜, マルチエージェント･シミュレーションに基づく都心部における人口分布の過渡的動態モデルに関する研究, 日本建築学会技術報告集, 10.3130/aijt.13.845, 13, 26, 845-848, 2007.12. |
| 187. | 萩島 理, 谷本 潤, 糸山 浩二, 古賀 正浩, 41344 複雑形状都市におけるバルク運動量輸送係数パラメタリゼーションのための風洞模型実験 : 第2報 境界層厚さ,祖度長,ゼロ面変化の推移(屋内拡散(1),環境工学II), 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2007, 693-694, 2007.07. |
| 188. | 末永 啓, 萩島 理, 谷本 潤, 成田 健一, 前田 一行, 41340 複雑形状都市におけるバルク輸送係数モデル化のための風洞実験(屋内拡散(1),環境工学II), 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2007, 0, 685-686, 2007.07. |
| 189. | 山内 敦雄, 谷本 潤, 相良 博喜, 萩島 理, ２車線合流狭窄部の交通流に見るジレンマゲームに関する研究, 情報処理学会研究報告知能と複雑系（ICS）, 2008, 20, 109-114, 2008.03, 実在の高速道路における基本図を再現する確率最適速度モデル（SOV）を基礎とする開放端セルオートマタ交通流モデルを構成した．これを２車線狭窄部合流問題に適用し，この物理機構にゲーム性が存在すること，すなわち流動状態に応じて Trivial ゲームか囚人のジレンマゲームの相が創発することがわかった．A cell automata traffic model based on Stochastic Optimal Velocity (SOV) model with an appropriate open boundary condition at both in-coming and out-going edges was established. The model can plausibly reproduce the fundamental diagram of a traffic flow observed in Japanese high way shown by Sugiyama. The model was applied to an analysis for a traffic flow of 2-to-1 lane junction considering co-existence of C-strategy agents always driving in a first lane and D-strategy agents driving in a lower density lane either the first or second lane. In both High-density and Jamming phases, D-agent's interruption into the first lane makes a heavier traffic jam bringing a lower social efficiency, in which we can observe the so-called Prisoner's Dilemma game structure.. |
| 190. | 佐藤 翔, 萩島 理, 谷本 潤, 都市表面抵抗係数に及ぼす幾何形状の影響, 九州大学大学院総合理工学報告, 10.15017/14604, 30, 1, 38-43, 2008.06, Drag force coefficient (Cd) of various types of urban-like roughness was measured in a wind tunnel. The geometry of roughness used for measurement was determined to clarify the effects of arrangement pattern, packing density and variation of roughness height. The result indicates that the nonuniformity of roughness height increases not only Cd but also roughness length z0. This tendency is more obvious under the condition of high packing density.. |
| 191. | 萩島理, 谷本潤, 末永啓, 池谷直樹, 前田一行, 成田健一, 直方体粗度群の床面バルクスカラー係数に関する風洞模型実験, 日本建築学会環境系論文集, 10.3130/aije.73.1225, 73, 632, 1225-1231, 2008.10. |
| 192. | 佐藤 慎哉, 萩島 理, 谷本 潤, 木炭を用いた調湿システムの性能評価のための数値解析, 九州大学大学院総合理工学報告, 10.15017/14603, 30, 1, 32-37, 2008.06, The authors established two types of humidity control system, which utilize charcoal chips produced from construction wastes. They contain regenerating cycles using solar energy. First of them is 'passive system', which is externally covered by a glass with a small air space. Another is 'hybrid system', which consists of a glass tube filled with charcoal chips and a fan for ventilation. The authors presented the numerical models of the systems and did numerical experiment. The experimental result indicates that 1) the appropriate natural ventilation was observed for humidity control using 'passive system'. 2) increase of the depth of charcoal could only increase the amount of moisture absorption of 'hybrid system', 3) Insulation for 'passive system' caused the reduction of amount of moisture absorption.. |
| 193. | Akashi Mochida, Aya Hagishima, Jun Tanimoto, Takashi Maruyama, Yuichi Tabata, Aya Kikuchi, Yoshiki Kikuchi, [Ⅲ101]Modeling of Aerodynamic Effects of Moving Automobiles for CFD Prediction of Turbulent Flow in Urban Area, Abstracts of 5th Japanese-German Meeting on Urban Climatology, 31, 2008.10. |
| 194. | 山野 満男, 菅原 広史, 成田 健一, 谷本 潤, 萩島 理, 石橋 昌樹, P353 都市キャニオン内の気流構造と上空への熱輸送, 大会講演予講集, 94, 0, 2008.10. |
| 195. | 山野 満男, 菅原 広史, 成田 健一, 谷本 潤, 萩島 理, 石橋 昌樹, P204 上空風向の変化に対する都市キャニオン内の気流構造変化, 大会講演予講集, 93, 0, 2008.04. |
| 196. | Akashi Mochida, Yuichi Tabata, Aya Hagishima, Jun Tanimoto, Takashi Maruyama, Aya Kikuchi, Yoshiki Kikuchi, Development of CFD Model for Reproducing Aerodynamic Effects of Moving Automobiles in Street Canyon, CD Proceedings of the 4th International Conference on Advance in Wind and Structures, 100-114, 2008.05. |
| 197. | 岩井 雄志, 谷本 潤, 萩島 理, 41084 居住者の生活スケジュールの多様性を考慮したユーティリティデマンド予測に関する研究 : 第1報 手法の概要と集合住宅モデルケースの検討(住宅のエネルギー消費(2),環境工学II), 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2008, 167-168, 2008.07. |
| 198. | パク ミンソン, 萩島 理, 全 貞ユン, 依田 浩敏, 谷本 潤, 和田 宗憲, 40572 集合住宅の環境性能に関する消費者選好の韓国と日本の比較研究(海外都市住環境,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2008, 1185-1186, 2008.07. |
| 199. | 菊池 圭起, 萩島 理, 谷本 潤, 持田 灯, 40452 複雑形状都市におけるバルク運動量輸送係数パラメタリゼーションのための風洞模型実験 : 第3報 直方体粗度のダイアモンド配列および自動車模型群に関する検討(風洞実験,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2008, 945-946, 2008.07. |
| 200. | 池谷 直樹, 萩島 理, 谷本 潤, 成田 健一, 末永 啓, 前田 一行, 40450 複雑形状都市におけるバルク輸送係数モデル化のための風洞実験 : 第2報 粗度高さが不均一な場合(風洞実験,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2008, 0, 941-942, 2008.07. |
| 201. | 萩島 理, 谷本 潤, 成田 健一, 40447 2次元都市キャノピー空間の気流性状及び熱収支に関する屋外観測 : 第3報 気流場の特性(街区の風通し,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2008, 0, 935-936, 2008.07. |
| 202. | 菊池 文, 持田 灯, 萩島 理, 谷本 潤, 田畑 侑一, 40442 自動車走行に伴う街路空間の流れ場・拡散場の変化を記述するCFDサブモデルの開発 : その4 自動車形状の再現の粗密および自動車形状に係わるパラメータの設定法の相違の影響について(都市キャノピー,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2008, 925-926, 2008.07. |
| 203. | 山内 敦雄, 谷本 潤, 相良 博喜, 萩島 理, 2車線合流狭窄部の交通流に見るジレンマゲームに関する研究, 電子情報通信学会技術研究報告. AI, 人工知能と知識処理, 107, 523, 109-114, 2008.02, 実在の高速道路における基本図を再現する確率最適速度モデル(SOV)を基礎とする開放端セルオートマタ交通流モデルを構成した.これを2車線狭窄部合流問題に適用し,この物理機構にゲーム性が存在すること,すなわち流動状態に応じてTrivialゲームか囚人のジレンマゲームの相が創発することがわかった.. |
| 204. | 谷本潤, 萩島理, 田中尉貴, 避難口のボトルネック効果に関するマルチエージェントシミュレーションと平均場近似に基づく解析, 日本建築学会環境系論文集, 10.3130/aije.74.753, 74, 640, 753-757, 2009.06. |
| 205. | 谷本潤, 萩島理, 岩井雄志, 諌山由紀子, 居住者の生活スケジュールの多様性を考慮した包括的ユーティリティデマンド予測手法の構築, 日本建築学会環境系論文集, 10.3130/aije.74.579, 74, 639, 579-586, 2009.05. |
| 206. | Naoko Konno, Yuichi Tabata, Aya Kikuchi, Akashi Mochida, Takashi Maruyama, Aya Hagishima, Jun Tanimoto, Yoshiki Kikuchi, CFD prediction of turbulent flow under the influence of moving automobiles in street canyons, CD Proceedings of The 7th International Conference on Urban Climate (ICUC-7), 2009.06. |
| 207. | 山野 満男, 菅原 広史, 成田 健一, 谷本 潤, 萩島 理, 石橋 昌樹, C209 上空への顕熱輸送に対する都市内気流構造の役割(大気境界層I), 大会講演予講集, 95, 0, 2009.04. |
| 208. | Manato Yamaguchi, Jun Tanimoto, Aya Hagishima, Yoshiki Kikuchi, Sheikh Ahmad Zaki, Akashi Mochida, A WIND TUNNEL STUDY ON DRAG COEFFICIENT FOR COMPLEX ARRAYS OF VARIOUS TYPES OF ROUGHNESS ELEMENT, CD Proceedings of The 7th International Conference on Urban Climate (ICUC-7), 2009.06. |
| 209. | 吉開 大祐, 依田 浩敏, 谷本 潤, 萩島 理, 518 環境関連技術の内部・外部価値の仮想評価スキームの開発 : (その1) 環境配慮型製品について, 日本建築学会研究報告. 九州支部. 2, 環境系, 48, 469-472, 2009.03. |
| 210. | 諌山 由紀子, 岩井 雄志, 谷本 潤, 萩島 理, 41055 居住者生活スケジュール多様性を考慮した熱負荷予測手法を用いた基礎的検討(熱負荷計算(2),環境工学II), 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2009, 121-122, 2009.07. |
| 211. | 田畑侑一, 今野尚子, 菊池文, 持田灯, 丸山敬, 萩島理, 谷本潤, 自動車群の流体力学的効果を再現するためのCFDモデルの開発－風洞実験との比較によるモデル係数の検討－, 第21回風工学シンポジウム論文集, 10.14887/kazekosymp.21.0.67.0, 67-72, 2010.12. |
| 212. | 萩島 理, 成田健一, 谷本 潤, 不安定条件下の屋外都市キャノピー層における気温の時空間分布計測による乱流構造の把握, 日本建築学会環境系論文集, 10.3130/aije.75.877, 75, 656, 877-883, 2010.10. |
| 213. | Jun Tanimoto, Atsuo Yamauchi, Does "game participation cost" affect the advantage of heterogeneous networks for evolving cooperation?, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2010.01.033, 389, 11, 2284-2289, 2010.06, Masuda [N. Masuda, Participation costs dismiss the advantage of heterogeneous networks in evolution of cooperation. Proceedings of the Royal Society B 274 (2007) 1815-1821] reported that a game participation cost (expressed by adding same negative values to all four elements in a 2 x 2 payoff matrix) affects the advantage of heterogeneous networks in the evolution of cooperation. We show that this finding is not always true depending on the features of the network, indicating that participation costs help cooperation in certain situations rather than destroy it. In a weaker dilemma game on a scale free network derived from the Barabasi & Albert algorithm with a larger average degree, game participation cost helps rather than destroy the network reciprocity. (C) 2010 Elsevier B.V. All rights reserved.. |
| 214. | Jun Tanimoto, Atsuo Yamauchi, Does "game participation cost" affect the advantage of heterogeneous networks for evolving cooperation?, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2010.01.033, 389, 11, 2284-2289, 2010.06, Masuda [N. Masuda, Participation costs dismiss the advantage of heterogeneous networks in evolution of cooperation. Proceedings of the Royal Society B 274 (2007) 1815-1821] reported that a game participation cost (expressed by adding same negative values to all four elements in a 2 x 2 payoff matrix) affects the advantage of heterogeneous networks in the evolution of cooperation. We show that this finding is not always true depending on the features of the network, indicating that participation costs help cooperation in certain situations rather than destroy it. In a weaker dilemma game on a scale free network derived from the Barabasi & Albert algorithm with a larger average degree, game participation cost helps rather than destroy the network reciprocity. (C) 2010 Elsevier B.V. All rights reserved.. |
| 215. | 古賀 康彦, 萩島 理, 谷本 潤, 41398 都市内粗度要素に作用する効力の壁面鉛直分布特性(市街地の風環境・換気他,環境工学II), 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2010, 811-812, 2010.07. |
| 216. | 池谷 直樹, 萩島 理, 谷本 潤, 41389 立方体粗度群床面-大気間のスカラー輸送現象に関するLarge Eddy Simulation(選抜梗概,都市の通風・換気(2),オーガナイズドセッション,環境工学II), 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2010, 785-788, 2010.07. |
| 217. | 諌山 由紀子, 岩井 雄志, 萩島 理, 谷本 潤, 41187 居住者生活スケジュールの多様性を考慮した熱負荷予測手法を適用した考察(住宅の熱負荷,環境工学II), 学術講演梗概集. D-2, 環境工学II, 熱, 湿気, 温熱感, 自然エネルギー, 気流・換気・排煙, 数値流体, 空気清浄, 暖冷房・空調, 熱源設備, 設備応用, 2010, 373-374, 2010.07. |
| 218. | パク ミンソン, 萩島 理, 谷本 潤, 全 貞ユン, 40585 集合住宅の諸性能に対する購入者選好の地域比較 : 韓国のソウル、大田、釜山、大邱、光州の場合(海外の環境設計事情,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2010, 1195-1196, 2010.07. |
| 219. | 萩島 理, 谷本 潤, 40384 1次元多層都市キャノピーモデルを用いた久が原フラックス観測の追試(都市気候モデル,環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2010, 793-794, 2010.07. |
| 220. | 田畑侑一, 持田灯, 今野尚子, 菊池文, 丸山敬, 萩島理, 谷本潤, 自動車の形状・密度を変化させた場合のモデル係数の最適値の変化 -走行する自動車群の流体力学的効果を再現するためのCFDモデルの開発(その1)-, 日本建築学会環境系論文集, 10.3130/aije.76.831, 76, 667, 831-837, 2011.09. |
| 221. | 今野尚子, 小野 梓, 持田 灯, 丸山 敬, 萩島 理, 谷本 潤, 田畑侑一, 山口真人, [Ⅲ145]自動車群・歩行者群等のような様々な形状・密度の一様物体群が風環境に与える影響の予測手法の開発（その2）パラメトリックスタディによる物体形状に即したCanopyモデル係数設定法の提案, 建築学会年次大会梗概集, 環境工学I, 703-704, 2011.08. |
| 222. | 小野梓, 今野尚子, 持田 灯, 丸山 敬, 萩島 理, 谷本 潤, 田畑侑一, 山口真人, [Ⅲ144]自動車群・歩行者群等のような様々な形状・密度の一様物体群が風環境に与える影響の予測手法の開発（その1）高アスペクト比形状の粗度群を対象とした建物Canopy モデル係数値の適用性の検討, 建築学会年次大会梗概集, 環境工学I, 701-702, 2011.08. |
| 223. | Aya Hagishima, Jun Tanimoto, Manato Yamaguchi, Yoshiki Kikuchi, Wind tunnel experiment on effect of shape of an obstacle on total drag force of regular array, Journal of Environmental Engineering, 10.3130/aije.76.485, 76, 663, 485-492, 2011.05, Drag coefficients (Cd) and vertical wind profiles for regular arrays were measured in a systematic series of wind tunnel experiment to investigate Hie shape effect of roughness element on Cd and air flow dynamics, and following results were presented. 1) Cd of an array consists of miniature vehicles was compared with that of an array consists of a combination of two different blocks, and the former is 10% to 20% lower than the latter due to the effect of the curved surface, in spite of their similar external scale. 2) The staggered array consists of elements with higher ratio shows larger peak of Cd against roughness density because of the less bluff-body character of a slender obstacle. 3) Turbulent characteristics within canopy layer of an array with high aspect ratio is similar to that of plant canopy.. |
| 224. | Sheikh Ahmad Zaki, Aya Hagishima, Jun Tanimoto, Spatial distribution of pressure drag acting on rectangular block arrays with various layouts, Proceedings of Building Simulation 2011: 12th Conference of International Building Performance Simulation Association, 1686-1693, 2011.12, This study reported a series of wind tunnel experiments on the spatial distribution of the pressure drag acting on the walls of rectangular block arrays, which were arranged in staggered, square, and diamond layouts under the conditions of different packing densities. The obtained bulk pressure coefficients of a block located in various staggered arrays showed clear dependency of packing density. This result suggests the importance of the consideration for the reduction of wind-driven cross ventilation due to neighborhood densely built-up area in building simulation coupled with ventilation model.. |
| 225. | Naoki Ikegaya, Aya Hagishimaand, Jun Tanimoto, Large-eddy simulation large-eddysimulation onscalartransferphenomena betweenurbansurfaceandatmosphere, Journal of Environmental Engineering, 10.3130/aije.76.943, 76, 668, 943-951, 2011.10, The authors performed a numerical simulation of scalar transfer phenomena between an urban surface and atmosphere. A parallelized large-eddy simulation model was adopted for the simulation. Two types of regular block arrays, a square array and staggered array, were arranged on the floor of computational domains. It was assumed that area scalar source was installed on the floor of arrays and scalar fluxes were estimated by using a wall function based on a logarithmic law. The results are summarized as follows. (l) The flow statistics of the normalized wind speed and turbulence intensity above a canopy showed good agreement with that obtained experimentally. (2) Scalar profiles shows self-similarity after 3rd rows. (3) Scalar boundary layer develops rapidly especially the edge of the scalar source area because of upward wind due to roughness.. |
| 226. | Naoko Konno, Azusa Ono, Akashi Mochida, Takashi Maruyama, Aya Hagishima, Jun Tanimoto, Yuichi Tabata, Canopy flow modeling for reproducing aerodynamic effects of roughness arrays with various densities and configurations, CD Proceedings of 13th International Conference on Wind Engineering, 2011.07. |
| 227. | 萩島 理, 谷本 潤, A scale-model experiment of surface temperature characteristics using an infrared radiation camera, 九州大学大学院総合理工学報告, 10.15017/18934, 32, 4, 1-8, 2011.01, An outdoor measurement was performed during fine weather with a scale-model array of cubical obstacles (size 100mm, 25% packing density, lattice-type square layout) that represent an idealized urban tissue. Surface temperature was recorded with high-frequency (10Hz) infrared camera, along with wind speed and solar radiation. Complementarily, air temperature was also measured at three heights in the near-wall region of a block surface using fine-wire thermocouples. Results showed the similarity of distribution between surface temperature and scalar transfer coefficient. We also found that 10s averaging period may be appropriate for the analysis of surface temperature fluctuation affected by turbulent air flow. In the near-wall region under particularly calm wind condition, air temperature fluctuation caused by a hot plume arising from the warmed surface was observed. The method presented in this study seems to be a promising tool to analyze surface temperature characteristics of scale-models in urban climate studies.. |
| 228. | 池谷 直樹, 萩島 理, 谷本 潤, 田中 雄大, 成田 健一, 40334 複雑都市形状における濃度プロファイル測定に基づく運動量・スカラー粗度の相似性(都市気候シミュレーション(1),環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2011, 0, 707-708, 2011.07. |
| 229. | 萩島 理, 山口 真人, 谷本 潤, 40333 直方体粗度群の抗力係数および流体力学的パラメータに関する考察(都市気候シミュレーション(1),環境工学I), 学術講演梗概集. D-1, 環境工学I, 室内音響・音環境, 騒音・固体音, 環境振動, 光・色, 給排水・水環境, 都市設備・環境管理, 環境心理生理, 環境設計, 電磁環境, 2011, 705-706, 2011.07. |
| 230. | Aya Hagishima, Minsun Park, Jun Tanimoto, Questionnaire survey on preference of environmental factors of residential buildings, Journal of Environmental Engineering, 10.3130/aije.77.523, 77, 676, 523-531, 2012.06, This paper reported a questionnaire survey on consumers' preference for several attributes of a condominium unit carried out in Kanagawa, Japan. The questionnaire were designed based on paired comparison conjoint theory, analytical hierarchy process (AHP), and rank method to quantify the preference for floor area. specifications of low C02 emission and VOC emission, and information technology (IT) facility. The responses of stated preference on paired comparison were analyzed based on both multi-logit and multi-probit methods. The result suggests the effectiveness of an inter-comparison among several types of probability model for evaluating the estimated willingness to pay for a group of small sample size.. |
| 231. | Azusa Ono, Naoko Konno, Akashi Mochida, Takashi Maruyama, Aya Hagishima, Jun Tanimoto, Numerical modelling of flow over roughness arrays with various densities and configurations, Proceedings of 8th International Conference on Urban Climates, ICUC8, 2012.08. |
| 232. | Jun Tanimoto, Markus Brede, Atsuo Yamauchi, Network reciprocity by coexisting learning and teaching strategies, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.85.032101, 85, 3, 2012.03, We propose a network reciprocity model in which an agent probabilistically adopts learning or teaching strategies. In the learning adaptation mechanism, an agent may copy a neighbor's strategy through Fermi pairwise comparison. The teaching adaptation mechanism involves an agent imposing its strategy on a neighbor. Our simulations reveal that the reciprocity is significantly affected by the frequency with which learning and teaching agents coexist in a network and by the structure of the network itself. © 2012 American Physical Society.. |
| 233. | 三坂 育正, 成田 健一, 谷本 潤, 萩島 理, 小島 倫直, H-1 大規模階段状緑化建築と隣接する公園の冷気生成に関する実測研究, 学術講演会論文集, 24, 1, 761-764, 2012.08. |
| 234. | K. Shigaki, S. Kokubo, J. Tanimoto, A. Hagishima, N. Ikegaya, Does copy-resistance enhance cooperation in spatial prisoner's dilemma?, EPL, 10.1209/0295-5075/98/40008, 98, 4, 2012.05, We propose a novel idea for the so-called pairwise-Fermi process by considering copy-resistance when an agent copies a neighbor's strategy, which implies that the focal agent with relatively affluent payoff vis-a-vis social average might be negative to copy her neighbor's strategy even if her payoff is less than the neighbor's payoff. Simulation results reveal that this idea with a revised strategy adaptation process significantly enhances cooperation for prisoner's dilemma games played on time-constant networks. Copyright (C) EPLA, 2012. |
| 235. | Naoki Ikegaya, Aya Hagishima, Jun Tanimoto, Yu-Dai Tanaka, A study on the similarity of the momentum and scalar roughness lengths over urban-like roughness, Journal of Environmental Engineering (Japan), 10.3130/aije.77.917, 77, 681, 917-923, 2012.11, We have performed a series of wind-tunnel experiments to measure scalar concentration profiles over urban-like roughness arrays. The concentration measurements revealed two features of scalar distribution. First, the high concentration filed was observed in the leeward region of each roughness element. Secondly, the averaged concentration became high up to the roughness height due to the updraft along the element and the boundary layer thickness drastically reach to the height in spite of the short length of scalar source area. In addition to the concentration measurements, we determined the roughness length of scalar based on the preliminary performed comprehensive study on scalar transfer coefficients, momentum transfer coefficients and wind profiles and discussed the similarity between momentum and scalar transfer phenomena by applying the relation between the Dalton number and the roughness Reynolds number.. |
| 236. | 池谷 直樹, 萩島 理, 谷本 潤, 古賀 康彦, 41366 都市キャノピー上空に形成される低速流体塊の統計的分析(地形風・都市キャノピー,環境工学II,2012年度大会(東海)学術講演会・建築デザイン発表会プログラム), 学術講演梗概集, 2012, 739-740, 2012.09. |
| 237. | 波多野 円, 萩島 理, 谷本 潤, 池谷 直樹, 松本 健太郎, 41365 直方体粗度群の壁面風圧に及ぼすアスペクト比の影響に関する風洞模型実験(地形風・都市キャノピー,環境工学II,2012年度大会(東海)学術講演会・建築デザイン発表会プログラム), 学術講演梗概集, 2012, 737-738, 2012.09. |
| 238. | 池谷 直樹, 萩島 理, 谷本 潤, 都市大気境界層上空の対数領域における空気力学パラメータ同定方法の考察, JWE : 日本風工学研究会誌 : Journal of Wind Engineering, 10.14887/jaweam.2013.0.113.0, 135, 113-114, 2013.04, 都市境界層の対数則には，床面抗力の大きさの指標である粗度長と床面の鉛直方向移動を意味するゼロ面変位の空気力学パラメータが含まれるが，それらの同定方法は十分確立されていない．そこで，本稿では過去に測定した床面摩擦抗力，粗度抗力に加え，粗度上空風速プロファイルを計測することにより，都市境界層における空気力学パラメータの同定方法につて考察した．境界層高さに対し粗度高さが大きくなる都市境界層においても対数則領域が形成され，その空気力学パラメータである粗度長は，対数領域内で同定することが出きれば，その方法にほとんど影響されないことがわかった．その一方で，ゼロ面変位は同定領域や同定方法に敏感に影響される．. |
| 239. | Sato Tsuyoshi, Hagishima Aya, Ikegaya Naoki, Tanimoto Jun, Particle Image Velocimetry Measurement of Unsteady Turbulent Flow around Regularly Arranged High-Rise Building Models, International Journal of High-Rise Buildings, 2, 2, 105-113, 2013.06, Recent studies proved turbulent flow properties in high-rise building models differ from those in low-rise building models by comparing turbulent statistics. Although it is important to understand the flow characteristics within and above high-rise building models in the study of urban environment, it is still unknown and under investigation. For this reason, we performed wind tunnel experiment using Particle Image Velocimetry (PIV) to investigate and identify the turbulent flow properties and characteristic flow patterns in high-rise building models. In particular, we focus on instantaneous flow field near the canopy and extracted flow field when homogeneous flow field were observed. As a result, six characteristic flow patterns were identified and the relationship between these flow patterns and turbulent organized structure were shown.. |
| 240. | 池谷 直樹, 萩島 理, 谷本 潤, 41388 都市粗度群空気力学パラメータの同定方法に関する考察(都市キャノピー・LES,環境工学II,2013 年度日本建築学会大会(北海道)学術講演会・建築デザイン発表会), 学術講演梗概集, 2013, 775-776, 2013.08. |
| 241. | 佐藤 幹, 萩島 理, 谷本 潤, 池谷 直樹, 41382 高アスペクト比模型群周囲の非定常乱流場に関するPIV計測(建物周辺の気流と拡散,環境工学II,2013 年度日本建築学会大会(北海道)学術講演会・建築デザイン発表会), 学術講演梗概集, 2013, 763-764, 2013.08. |
| 242. | 今野尚子, 小野 梓, 持田 灯, 丸山 敬, 萩島 理, 谷本 潤, 都市空間に散在する微小物体群により形成されるCanopy Flowのモデリング 一様物体群のアスペクト比と密度が異なる場合に対するCanopyモデル係数設定法の提案, 日本建築学会環境系論文集, 10.3130/aije.79.699, 79, 702, 699-707, 2014.08. |
| 243. | 谷本 潤, 『旗本三嶋政養日記』にみる幕末期中級旗本の居住様態及び家政変遷に関する小考, 日本建築学会計画系論文集, 79, 699, 1197-1203, 2014.05. |
| 244. | Juyeon Chung, Naoki Ikegaya, Aya Hagishima, Jun Tanimoto, A wind tunnel study on effect of scalar transport between urban-like block array and air, ASIM 2014 (IBPSA Asia conference), 2014.11. |
| 245. | 池谷 直樹, 萩島 理, 谷本 潤, 41315 都市境界層を模擬した粗面上の速度・湿度プロファイル相似性に関する考察(都市気流・風洞実験,環境工学II,2014年度日本建築学会大会(近畿)学術講演会・建築デザイン発表会), 学術講演梗概集, 2014, 653-654, 2014.09. |
| 246. | 池谷 直樹, 鄭 朱娟, 萩島 理, 谷本 潤, 立方体粗度面上の速度・濃度プロファイルの相似性, 日本建築学会環境系論文集, 711, 2015.05. |
| 247. | Juyeon Chung, Aya Hagishima, Naoki Ikegaya, Jun Tanimoto, Wind‐Tunnel Study of Scalar Transfer Phenomena for Surfaces of Block Arrays and Smooth Walls with Dry Patches, Boundary-Layer Meteorology, 10.1007/s10546-015-0063-3, 157, 2, 219-236, 2015.11. |
| 248. | Eriko Fukuda, Jun Tanimoto, Mitsuhiro Akimoto, Influence of breaking the symmetry between disease transmission and information propagation networks on stepwise decisions concerning vaccination, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2015.04.018, 80, 47-55, 2015.11, In previous epidemiological studies that address adaptive vaccination decisions, individuals generally act within a single network, which models the population structure. However, in reality, people are typically members of multiplex networks, which have various community structures. For example, a disease transmission network, which directly transmits infectious diseases, does not necessarily correspond with an information propagation network, in which individuals directly or indirectly exchange information concerning health conditions and vaccination strategies. The latter network may also be used for strategic interaction (strategy adaptation) concerning vaccination. Therefore, in order to reflect this feature, we consider the vaccination dynamics of structured populations whose members simultaneously belong to two types of networks: disease transmission and information propagation. Applying intensive numerical calculations, we determine that if the disease transmission network is modeled using a regular graph, such as a lattice population or random regular graph containing individuals of equivalent degrees, individuals should base their vaccination decisions on a different type of network. However, if the disease transmission network is a degree-heterogeneous graph, such as the Barabasi Albert scale-free network, which has a heterogeneous degree according to power low, then using the same network for information propagation more effectively prevents the spread of epidemics. Furthermore, our conclusions are unaffected by the relative cost of vaccination. (C) 2015 Elsevier Ltd. All rights reserved.. |
| 249. | Jun Tanimoto, Hirokji Sagara, How the indirect reciprocity with co-evolving norm and strategy for 2 x 2 prisoner's dilemma game works for emerging cooperation, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2015.07.006, 438, 595-602, 2015.11, We built a new indirect reciprocity model based on binary image scores, where an agent's strategy and norm co-evolve. The norm, meaning what behavior is evaluated as "good" or "bad," stipulates how image scores of two agents playing a game is altered, which has been presumed to be a fixed value in most previous studies. Also, unlike former studies, our model allows an agent to play with an agent who has a different norm. This point of relaxing the freedom of the model pulls down cooperation level vis-a-vis the case where an agent always plays with another one having same norm. However, it is observed that a rather larger dilemma shows robust cooperation establishing compared with a smaller dilemma, since a norm that punishes a so-called second-order free-rider is prompted. To encourage the evolution of norms to be able to punish second-order free-riders, a society needs a small number of defectors. This is elucidated by the fact that cases with action error are more cooperative than those without action error. (C) 2015 Published by Elsevier B.V.. |
| 250. | Zhen Wang, Satoshi Kokubo, Marko Jusup, Jun Tanimoto, Dilemma strength as a framework for advancing evolutionary game theory Reply to comments on "Universal scaling for the dilemma strength in evolutionary games", PHYSICS OF LIFE REVIEWS, 10.1016/j.plrev.2015.07.012, 14, 56-58, 2015.09. |
| 251. | Jun Tanimoto, Correlated asynchronous behavior updating with a mixed strategy system in spatial prisoner's dilemma games enhances cooperation, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2015.03.021, 80, 39-46, 2015.11, A new model of mixed strategy system for spatial prisoner's dilemma games is proposed. As an alternative to the typical mixed strategy system, wherein a behavior of either cooperation or defection is stochastically determined for each neighbor based on the agent's overall strategy, in our mixed strategy system, the agent instead correlates his strategies with those of his neighbors. For example, he tends to offer cooperation more frequently to his neighbor who is cooperative more often. This model provides results with significantly enhanced cooperation compared with those obtained with the conventional mixed strategy model. Interestingly, some of the evolutionary paths followed under strong dilemma situations can be divided into two specific periods: Defector-Enduring (D-END), when the number of defectors rapidly decreases, and the subsequent Defector-Expanding (D-EXP), when the surviving defectors' clusters start to expand, allowing the global cooperation fraction to fall to a lower level. The D-END and D-EXP periods seem analogous to the END and EXP periods presented by the author in previous studies. (C) 2015 Elsevier Ltd. All rights reserved.. |
| 252. | Jun Tanimoto, Considering individual satisfaction levels enhances cooperation in a spatial prisoner's dilemma game, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2015.02.025, 80, 24-30, 2015.11, Based on the observance in human society, the satisfaction level of an individual as a result of an obtained payoff depends on personal tendency to some extent; we establish a new model for spatial prisoner's dilemma games. We describe individual satisfaction as a stochastically deviated value around each of the four payoffs stipulated by a payoff matrix, which is maintained throughout the life of a certain agent. When strategy updating, an agent who refers to his own satisfaction level cannot see neighbors' satisfaction levels but can only observe neighbors' accumulated payoffs. By varying the update rule and underlying topology, we perform numerical simulations that reveal cooperation is significantly enhanced by this change. We argue that this enhancement of cooperation is analogous to a stochastic resonance effect, like the payoff noise effects Perc (2006). (C) 2015 Elsevier Ltd. All rights reserved.. |
| 253. | Mohamad Mohd Faizal, Hagishima Aya, Ikegaya Naoki, Tanimoto Jun, Omar Abd Rahman, Aerodynamic effect of overhang on a turbulent flow field within a two-dimensional street canyon, 九州大学大学院総合理工学報告, 10.15017/1525830, 37, 1, 1-7, 2015.09, This paper reports the results of flow field analysis within and above a two-dimensional street canyon with various overhang lengths using large-eddy simulation (LES). Simulations were conducted for a constant canyon aspect ratio of W/H = 3, where W is the street width and H is the building height. Three different overhang lengths were simulated with P = 0H, 0.5H, and 1H in order to derive the mean and instantaneous flow characteristics. The results are compared with wind tunnel experiments for validation. The LES results of the mean flow with the P = 0H condition agree fairly well with the wind tunnel data. However, profiles of the standard deviation for the streamwise and vertical velocity components show large discrepancies at all measured locations. In addition, an increase in overhang length on both building façades significantly modifies the in-canyon flow pattern by limiting the penetration of the bulk flow into the canyon layer.. |
| 254. | Jun Tanimoto, Takuya Fujiki, Shinji Kukida, Naoki Ikegaya, Aya Hagishima, Acquisition of the field measurement data relating to lane change actions, International Journal of Modern Physics C, 10.1142/S0129183115500722, 26, 7, 2015.07, As a data set for validation of microscopic simulation models, we obtained the fundamental diagram (flux versus density relation), and the relations of velocity versus density, lane usage ratio versus density and lane-changing frequency versus density derived from a single field measurement campaign held at a Japanese urban expressway. The results were drawn from image analysis of video camera data obtained at the site.. |
| 255. | 鄭 朱娟, 萩島 理, 池谷 直樹, 谷本 潤, 41361 都市表面のスカラーソース偏在と粗度がスカラーバルク係数に及ぼす影響の解明 : 第二報 バルク係数のソースサイズ依存性及びスカラー粗度長(都市キャノピー流れのモデル化,環境工学II,学術講演会・建築デザイン発表会), 学術講演梗概集, 2015, 759-760, 2015.09. |
| 256. | 萩島 理, 鄭 朱娟, 池谷 直樹, 谷本 潤, 41360 都市表面のスカラーソース偏在と粗度がスカラーバルク係数に及ぼす影響 : 第一報 実験概要及びバルク係数の測定結果(都市キャノピー流れのモデル化,環境工学II,学術講演会・建築デザイン発表会), 学術講演梗概集, 2015, 757-758, 2015.09. |
| 257. | 佐藤 幹, 萩島 理, 池谷 直樹, 谷本 潤, 41358 庇を有する2次元ストリートキャニオン周囲の気流場に関するPIV計測(都市キャノピー流れのモデル化,環境工学II,学術講演会・建築デザイン発表会), 学術講演梗概集, 2015, 753-754, 2015.09. |
| 258. | 池谷 直樹, 廣瀬 智陽子, 萩島 理, 谷本 潤, 41336 立方体粗度の壁面風圧に対する非定常気流場の影響に関する数値流体解析(自然換気・風圧係数,環境工学II,学術講演会・建築デザイン発表会), 学術講演梗概集, 2015, 689-690, 2015.09. |
| 259. | 深見 亮介, 萩島 理, 谷本 潤, 池谷 直樹, 40409 住宅における冷房使用行動の確率性状に関する考察(住宅のエネルギー,環境工学I,学術講演会・建築デザイン発表会), 学術講演梗概集, 2015, 851-852, 2015.09. |
| 260. | Tsuyoshi Sato, Aya Hagishima, Naoki Ikegaya, Jun Tanimoto, Wind tunnel experiment on turbulent flow field around 2D street canyon with eaves, Journal of Environmental Engineering (Japan), 10.3130/aije.81.467, 81, 723, 467-476, 2016.05, In this study, the influence of the complexity of shape of roughness on turbulent flow fields in a 2D street canyon was investigated using a wind tunnel experiment (WTE). Time-resolved particle image velocimetry (TR-PIV) was employed to investigate temporally averaged flow fields, the spatial distributions of turbulent statistics, canyon ventilation rates, and the flow exchange mechanism between the regions above and inside a canyon. The measurements revealed that the temporally averaged flow fields and the spatial distributions of turbulent statistics are drastically changed by the complexity of roughness, especially when the canyon aspect ratio is small. Moreover, the ventilation rate is reduced by the eaves attached to roofs. However, the decreasing rate of the ventilation strongly depends on the canyon aspect ratio.. |
| 261. | Ryo Matsuzawa, Jun Tanimoto, Eriko Fukuda, Spatial prisoner's dilemma games with zealous cooperators, PHYSICAL REVIEW E, 10.1103/PhysRevE.94.022114, 94, 2, 2016.08, The existence of a zealot who stays a cooperator irrespective of the result of an interaction has been reported to add "social viscosity" to a population and thereby helps increase the cooperation level in prisoner's dilemma games, which premises the so-called well-mixed situation of a population. We found that this is not always true when a spatial structure, i.e., connecting agent, is introduced. Deploying zealots is counterproductive, especially when the underlying topology is homogenous, similar to that of a lattice. Our simulation reveals how the existence of never-converting cooperators destroys rather than boosts cooperation. We explain detailed mechanisms behind this interesting finding by referring to our previously presented concepts with respect to evolutionary dynamic processes for spatial games under the names enduring and expanding periods.. |
| 262. | Jun Tanimoto, Kousuke Nakamura, Social dilemma structure hidden behind traffic flow with route selection, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2016.04.023, 459, 92-99, 2016.10, Several traffic flows contain social dilemma structures. Herein, we explored a route selection problem using a cellular automaton simulation dovetailed with evolutionary game theory. In our model, two classes of driver-agents coexist: D agents (defective strategy), which refer to traffic information for route selection to move fast, and C agents (cooperative strategy), which are insensitive to information and less inclined to move fast. Although no evidence suggests that the social dilemma structure in low density causes vehicles to move freely and that in high density causes traffic jams, we found a structure that corresponds to an n-person (multiplayer) Chicken (n-Chicken) game if the provided traffic information is inappropriate. If appropriate traffic information is given to the agents, the n-Chicken game can be solved. The information delivered to vehicles is crucial for easing the social dilemma due to urban traffic congestion when developing technologies to support the intelligent transportation system (ITS). (C) 2016 Elsevier B.V. All rights reserved.. |
| 263. | N. Ikegaya, C. Hirose, A. Hagishima, J. Tanimoto, Effect of turbulent flow on wall pressure coefficients of block arrays within urban boundary layer, BUILDING AND ENVIRONMENT, 10.1016/j.buildenv.2016.02.005, 100, 28-39, 2016.05, Various numerical simulations have been developed to evaluate the mean ventilation rates of a target building; however, the manner in which turbulent flow generated by buildings and surrounding conditions affects the mean and fluctuating ventilation rates is not well understood. Therefore, we have performed large-eddy simulation of flow and pressure fields above two types of block arrays (lattice-type square and staggered pattern) to clarify the turbulent characteristics of estimated ventilation rates based on pressure coefficient distribution on the block faces. The concept of short-term ventilation rates, which are estimated from filtered pressure coefficients, is introduced to investigate the temporal variation in the estimated ventilation rates for different locations of the block faces and arrangements. First, mean and second-order turbulent statistics agree well with previous results obtained from both wind-tunnel experiments and numerical simulations, indicating that the turbulent characteristics of the flow above urban-like arrays are well reproduced. Second, short-term ventilation rates are found to vary temporally and spatially. Therefore, these values instantaneously become larger or smaller than the mean ventilation rates. In addition, complex fluctuation patterns of pressure coefficient distribution are found to be caused by air flow introduction from the block arrays into gaps between the blocks as well as by small-scale turbulence generated by surrounding buildings themselves. Lastly, the temporal statistics of filtered pressure coefficients show that the short-term ventilation rates can possibly become stronger or weaker than the mean ventilation rates, whereas the accumulated fluctuating ventilation rates are almost comparable to those estimated by mean pressure coefficients. (C) 2016 Elsevier Ltd. All rights reserved.. |
| 264. | Rahnat Nurizzatul Atikha, Hagishima Aya, Ikegaya Naoki, Tanimoto Jun, Omar Abd Rahman, An experimental study on aerodynamic interaction between a boundary layer generated by a smooth and rough wall and a wake behind a spire, 九州大学大学院総合理工学報告, 10.15017/1560669, 37, 2, 19-26, 2016.02, A wind tunnel experiment to assess the flow characteristics of the wake behind a spire mounted normal to the wind tunnel floor was conducted to clarify the interaction between the wake flow and the wall shear boundary layer. To reproduce the contrasting boundary layer depth, two types of walls-a smooth wall and a regular cube array-were adopted; for each wall, the spanwise distribution of the streamwise velocity was measured at two downwind positions and seven heights within and above the wall boundary layer with and without a spire. The span wise distribution of the wake generated by the spire far above the wall boundary layer with low turbulence agreed with the well-known function for two-dimensional (2D) wake flow, derived theoretically from the gradient-diffusion model, despite the weak asymmetry of the inflow. In contrast, the spanwise distribution of the wake within or near the outer edge of the wall boundary layer showed different trends from that of the 2D wake flow. In the former, the expansion of the wake width is compressed in the lateral direction by the turbulence of the wall boundary layer and the velocity deficit of the wake is sustained far from the spire.. |
| 265. | Jun Tanimoto, A multi-community homogeneous small-world network and its fundamental characteristics, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2016.04.044, 460, 88-97, 2016.10, We introduce a new small-world network - which we call the multi-community homogeneous small-world network - that is divided into multiple communities that are relatively isolated, similar to sparsely connected islands. A generating algorithm is presented and its network parameters are explored. To elucidate the fundamental characteristics of the proposed topology, we adopt spatial prisoner's dilemma games as a template for discussion. Comparing with a conventional homogeneous small-world network, more enhanced network reciprocity is observed in games where a stag hunt-type dilemma is large. With intensive analysis, we find how this enhancement is brought about. (C) 2016 Elsevier B.V. All rights reserved.. |
| 266. | 池谷 直樹, 廣瀬 智陽子, 萩島 理, 谷本 潤, 都市乱流境界層における建物壁面風圧と周辺気流に関するLarge-Eddy Simulation (日本風工学会論文集), JWE = 日本風工学会誌 : journal of wind engineering, JAWE : wind engineers, JAWE, 42, 1, 22-35, 2017.01. |
| 267. | 小野 哲嗣, 萩島 理, 谷本 潤, 池谷 直樹, 大規模集合住戸のエアコンの電力使用量の時系列データに基づく統計分析, 空気調和・衛生工学会論文集, 239, 1-9, 2017.02. |
| 268. | 谷本 潤, 萩島 理, 地産地消エネルギーシステムへの転換のための生活スケジュールの確率的揺らぎを考慮したトータルユーティリティ予測環境手法の構築と実在都市への適用 : 福岡県春日市におけるエコライフスタイルへの変換がもたらす潜在的省エネルギー効果と震災に対応したピーク電力カット方策の評価(概要) (都市再生研究助成事業(平成27・28年度助成分)最終報告), Urban study, 64, 36-51, 2017.06. |
| 269. | 池谷 直樹, 池田 恭彰, 萩島 理, 谷本 潤, 単純形状粗度が形成する地表面近傍乱流場に関する統計的解析 (日本風工学会論文集), JWE = 日本風工学会誌 : journal of wind engineering, JAWE : wind engineers, JAWE, 42, 1, 1-8, 2017.01. |
| 270. | Naoki Ikegaya, Yasuaki Ikeda, Aya Hagishima, Jun Tanimoto, Statistical analysis of wind speeds at a pedestrian level of urban-like roughness, Journal of Wind Engineering, 10.5359/jwe.42.1, 42, 1, 1-8, 2017.01, We have performed Large-Eddy Simulation of turbulent boundary layer over simplified urban like roughness. Totally six types of arrays are adopted with several roughness densities and roughness aspect ratios. The turbulent flow fields at a pedestrian level are investigated to identify probability characteristics of unsteady flows. Conclusions are summarized as follows. First, the probability density functions of wind speeds at a pedestrian level show long-tail shape with positive skewness for all arrays and well explained by dimensionless probability variable defined by the mean and standard deviation of wind speeds. On the other hands, the discrepancies of the probability between arrays become considerable for events with wind speeds larger than triple of the standard deviations. Second, such events with large wind speed rarely happen the cumulative probability shows approximately 1%. Lastly, linear relationships are confirmed between the mean and percentile wind speeds. These findings will help the understanding of the unsteadiness nature of turbulent flow in urban boundary layer especially when evaluating very rare events such as gusts or extreme low winds.. |
| 271. | Naoki Ikegaya, Chiyoko Hirose, Aya Hagishima, Jun Tanimoto, Effect of turbulent flows generated by simplified roughness blocks on instantaneous wall pressure based on large-eddy simulation, Journal of Wind Engineering, 10.5359/jwe.42.22, 42, 1, 22-35, 2017.01, We have performed Large-Eddy Simulation of flow and pressure fields over two types of urban-like block arrays in order to investigate the relationships between instantaneous building wall pressure and surrounding flow fields. The adopted block arrays are: lattice-type square and staggered pattern. The analysis on the distributions of statistics for wall pressure shows that the large values of the statistics are observed along with the top and side edges of the wall for the square array, whereas they are shown on an upper half region of the wall for the staggered array. These large values are due to air flow introduction from both above and side of the target block for square array in contrast, strong flows introduced into canopy area cause large pressures of the upper half of the wall for staggered array.. |
| 272. | Tsuyoshi Sato, Aya Hagishima, Naoki Ikegaya, Jun Tanimoto, A study on accuracy of particle image velocimetry in a wind tunnel simulating airflow around building scale model, AIJ Journal of Technology and Design, 10.3130/aijt.23.567, 23, 54, 567-572, 2017.06, PIV is an attractive experimental method for investigating turbulent flow around building model in a wind tunnel. However, it is difficult to obtain data with high accuracy in large size wind tunnel. In this paper, first we give an overview of PIV technique and organize the experimental conditions of past PIV in urban climatology. Then, we consider a technological problem which is called peak locking. We explain the mechanism of the generation of peak locking and how it affects the final output. Avoiding peak locking is difficult in general experimental condition, but it is mitigated by a simple image processing.. |
| 273. | N. Ikegaya, Y. Ikeda, A. Hagishima, A. A. Razak, J. Tanimoto, A prediction model for wind speed ratios at pedestrian level with simplified urban canopies, THEORETICAL AND APPLIED CLIMATOLOGY, 10.1007/s00704-015-1655-z, 127, 3-4, 655-665, 2017.02, The purpose of this study is to review and improve prediction models for wind speed ratios at pedestrian level with simplified urban canopies. We adopted an extensive database of velocity fields under various conditions for arrays consisting of cubes, slender or flattened rectangles, and rectangles with varying roughness heights. Conclusions are summarized as follows: first, a new geometric parameter is introduced as a function of the plan area index and the aspect ratio so as to express the increase in virtual density that causes wind speed reduction. Second, the estimated wind speed ratios in the range 0.05 < z/h < 0.3, where h is the building height, are consistent with those derived from the database to within an error of +/- 25%. Lastly, the effects of the spatial distribution of the flow were investigated by classifying the regions near building models into areas in front of, to the side of, or behind the building. The correlation coefficients between the wind speeds averaged over the entire region, and the front or side region values are larger than 0.8. In contrast, in areas where the influence of roughness elements is significant, such as behind a building, the wind speeds are weakly correlated.. |
| 274. | T. Kawaminami, N. Ikegaya, A. Hagishima, J. Tanimoto, Velocity and scalar concentrations with low occurrence frequencies within urban canopy regions in a neutrally stable shear flow over simplified urban arrays, Journal of Wind Engineering and Industrial Aerodynamics, 10.1016/j.jweia.2018.09.024, 182, 286-294, 2018.11, © 2018 Elsevier Ltd The unsteadiness of urban airflow influences rare events of high wind speeds or high scalar concentrations. Therefore, this study uses large-eddy simulations to investigate the geometrical impact of generic block arrays on the statistical features of wind speeds and scalar concentrations within urban canopy regions. Six types of urban-like arrays with uniform and non-uniform block heights are considered, and probability density functions of wind speeds and scalar concentrations are derived based on the flow and concentration distributions within urban canopy regions. Exceeding wind speeds and scalar concentrations are determined through cumulative probability densities. The non-uniform spatial distribution of scalar concentrations is found to be correlated with the velocity magnitude distribution. In particular, airflows with strong wind speeds near tall blocks contribute to a reduction in the scalar concentration in that region. The probability density functions of velocity magnitude for arrays with height variations become long-tailed as the horizontally averaged wind speeds increase. Accordingly, the probability density at high scalar concentrations is lower for arrays with height variations. Finally, the exceeding wind speeds and scalar concentrations for arrays with height variation can be expressed as linear functions of the mean wind speed.. |
| 275. | Kazuki Kuga, Jun Tanimoto, Marko Jusup, To vaccinate or not to vaccinate: A comprehensive study of vaccination-subsidizing policies with multi-agent simulations and mean-field modeling, JOURNAL OF THEORETICAL BIOLOGY, 10.1016/j.jtbi.2019.02.013, 469, 107-126, 2019.05, We combined the elements of evolutionary game theory and mathematical epidemiology to comprehensively evaluate the performance of vaccination-subsidizing policies in the face of a seasonal epidemic. We conducted multi-agent simulations to, among others, find out how the topology of the underlying social networks affects the results. We also devised a mean-field approximation to confirm the simulation results and to better understand the influences of an imperfect vaccine. The main measure of a subsidy' performance was the total social payoff as a sum of vaccination costs, infection costs, and tax burdens due to the subsidy. We find two types of situations in which vaccination-subsidizing policies act counterproductively. The first type arises when the subsidy attempts to increase vaccination among past non-vaccinators, which inadvertently creates a negative incentive for voluntary vaccinators to abstain from vaccination in hope of getting subsidized. The second type is a consequence of overspending at which point the marginal cost of further increasing vaccination coverage is higher than the corresponding marginal cost of infections avoided by this increased coverage. The topology of the underlying social networks considerably worsens the subsidy's performance if connections become random and heterogeneous, as is often the case in human social networks. An imperfect vaccine also worsens the subsidy's performance, thus narrowing or completely closing the window for vaccination-subsidizing policies to beat the no-subsidy policy. These results imply that subsidies should be aimed at voluntary vaccinators while avoiding overspending. Once this is achieved, it makes little difference whether the subsidy fully or partly offsets the vaccination cost. (C) 2019 Elsevier Ltd. All rights reserved.. |
| 276. | Tetsushi Ono, Aya Hagishima, Jun Tanimoto, Sheikh Ahmad Zaki, Naja Aqilah Hisham, Statistical analysis of air conditioning peak loads of multiple dwellings, E3S Web of Conferences, 10.1051/e3sconf/201911104057, 111, 2019.08, © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 Evaluation of the aggregated air-conditioning load of multiple dwellings is important for demand response through the optimum control of numerous air-conditioners (A/Cs), for development of smart-city or smart-community technologies. However, past studies have mainly focused on the characteristics of A/C load in a single household. With this background, the authors conducted statistical analysis of time-series data for A/C electricity consumption in 489 dwellings in Osaka, Japan, and 20 dwellings in Kuala Lumpur, Malaysia to grasp the feature of aggregated A/C load of multiple dwellings. The findings of this analysis are followings: 1) the aggregated A/C load peak per dwelling decreased by almost 50% as the number of dwellings increased from 1 to 10, due to the offset of the diverse time-patterns of A/C load. 2) The occurrence of the top 2.5% A/C load shows strong time and date dependency for an A/C load aggregated by many dwellings.. |
| 277. | C. Hirose, N. Ikegaya, A. Hagishima, J. Tanimoto, Outdoor measurement of wall pressure on cubical scale model affected by atmospheric turbulent flow, Building and Environment, 10.1016/j.buildenv.2019.106170, 160, 2019.08, © 2019 Elsevier Ltd Most studies on indoor ventilation have utilized wind-tunnel experiments (WTEs) or computational fluid dynamics based approaches under well-controlled flow conditions. However, the effects of urban boundary layer flow with variable wind directions and various turbulence scales on the ventilation driven by the pressure differences between the upwind and downwind sides of a building within a block array is still under discussion. Therefore, we conducted outdoor experiments at comprehensive outdoor scale model (COSMO) experiment sites in an urban climate to clarify the relationships between the building wall pressure differences and the approaching flow. The pressure coefficients for the outdoor site were comparable with those obtained during previous WTEs. Accordingly, temporal variations in the wind speed and pressure coefficient on the target block were investigated in detail using low-pass filtering operations. The relationships between the filtered wind speed and the pressure differences indicate that the slower temporal variations in the wall pressure showed good agreement with the filtered approaching flow. In addition, the correlation coefficient between the filtered wind speed and the wall pressure differences quantified the apparent coherence between the turbulent flow and the ventilation rate. Furthermore, the statistics of the ventilation rate were determined based on the conventional model to clarify the effects of the turbulent flow on the natural ventilation rate. The ratios between the mean and short-term ventilation rates imply that the short-term ventilation rate presented dramatic temporal fluctuations owing to the various scale turbulence generated by the atmospheric flow.. |
| 278. | Jun Tanimoto, Kyaw Thu, Hiroshi Furuno, Nasruddin, Mohd Fairus Mohd Yasin, Muhammad Arif Budiyanto, Editorial, Evergreen, 10.1007/s11282-007-0065-z, 6, 2, iii-iv, 2019.06. |
| 279. | Jun Tanimoto, Kyaw Thu, Hiroshi Furuno, Editorial, Evergreen, 10.5109/2349293, 6, 3, ii-iii, 2019.09. |
| 280. | Jun Tanimoto, Kyaw Thu, Hiroshi Furuno, Editorial, Evergreen, 10.5109/2547344, 6, 4, ii-iii, 2019.12. |
| 281. | K. M. Ariful Kabir, Kazuki Kuga, Jun Tanimoto, The impact of information spreading on epidemic vaccination game dynamics in a heterogeneous complex network- A theoretical approach, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2019.109548, 132, 109548-109548, 2020.03, A modified susceptible-vaccinated-infected-recovered (SIR/V) with unaware-aware (UA) epidemic model in heterogeneous networks is presented to study the effect of information spreading in the spatial structure of the vaccination game on epidemic dynamics. Two layers SIR/V epidemic model is considered to elucidate information spreading, where the fraction of susceptible, vaccinated and infected individuals are parted as unaware and aware state as each susceptible and vaccinated persons are allied with their infected neighbors by a spatial structure, say, an underlying network. The context deduces epidemic vaccination game with awareness influence dynamics in one single season followed by a strategy update process that refer an individual to take imperfect vaccination or not. We considered two different strategy updating rules: individual based risk assessment (IB-RA) and strategy-based risk assessment (SB-RA) to explore how different underlying network topologies, say, random graph and scale free networks, subsequently giving impact on the final epidemic size, vaccination coverage and average social payoff through the effect of information spreading on epidemic. Thus, it can be seen that, awareness can enhance the epidemic threshold effectiveness and lessen the spreading of infection in a scale free network other than random graph and homogeneous network. (C) 2019 Elsevier Ltd. All rights reserved.. |
| 282. | Md Rajib Arefin, K. M. Ariful Kabir, Marko Jusup, Hiromu Ito, Jun Tanimoto, Social efficiency deficit deciphers social dilemmas, SCIENTIFIC REPORTS, 10.1038/s41598-020-72971-y, 10, 1, 16092, 2020.09, What do corruption, resource overexploitation, climate inaction, vaccine hesitancy, traffic congestion, and even cancer metastasis have in common? All these socioeconomic and sociobiological phenomena are known as social dilemmas because they embody in one form or another a fundamental conflict between immediate self-interest and long-term collective interest. A shortcut to the resolution of social dilemmas has thus far been reserved solely for highly stylised cases reducible to dyadic games (e.g., the Prisoner's Dilemma), whose nature and outcome coalesce in the concept of dilemma strength. We show that a social efficiency deficit, measuring an actor's potential gain in utility or fitness by switching from an evolutionary equilibrium to a social optimum, generalises dilemma strength irrespective of the underlying social dilemma's complexity. We progressively build from the simplicity of dyadic games for which the social efficiency deficit and dilemma strength are mathematical duals, to the complexity of carcinogenesis and a vaccination dilemma for which only the social efficiency deficit is numerically calculable. The results send a clear message to policymakers to enact measures that increase the social efficiency deficit until the strain between what is and what could be incentivises society to switch to a more desirable state.. |
| 283. | Jun Tanimoto, Kyaw Thu, Nasruddin, Yudan Whulanza, Radon Dhelika, Editorial, Evergreen, 10.5109/6781026, 7, 1, iii-iv, 2020.03. |
| 284. | Jun Tanimoto, Kyaw Thu, Editorial, Evergreen, 10.5109/4793625, 7, 2, iii-vi, 2020.06. |
| 285. | Jun Tanimoto, Kyaw Thu, Fitria Rahmawati, H. Wibowo Atmanto, Editorial, Evergreen, 10.5109/4842514, 7, 3, iii-viii, 2020.09. |
| 286. | Jun Tanimoto, Kyaw Thu, Editorial, Evergreen, 10.5109/6622876, 7, 4, iii-v, 2020.12. |
| 287. | Hiromu Ito, Jun Tanimoto, Dynamic utility: the sixth reciprocity mechanism for the evolution of cooperation, ROYAL SOCIETY OPEN SCIENCE, 10.1098/rsos.200891, 7, 8, 200891-200891, 2020.08, Game theory has been extensively applied to elucidate the evolutionary mechanism of cooperative behaviour. Dilemmas in game theory are important elements that disturb the promotion of cooperation. An important question is how to escape from dilemmas. Recently, a dynamic utility function (DUF) that considers an individual's current status (wealth) and that can be applied to game theory was developed. The DUF is different from the famous five reciprocity mechanisms called Nowak's five rules. Under the DUF, cooperation is promoted by poor players in the chicken game, with no changes in the prisoner's dilemma and stag-hunt games. In this paper, by comparing the strengths of the two dilemmas, we show that the DUF is a novel reciprocity mechanism (sixth rule) that differs from Nowak's five rules. We also show the difference in dilemma relaxation between dynamic game theory and (traditional) static game theory when the DUF and one of the five rules are combined. Our results indicate that poor players unequivocally promote cooperation in any dynamic game. Unlike conventional rules that have to be brought into game settings, this sixth rule is universally (canonical form) applicable to any game because all repeated/evolutionary games are dynamic in principle.. |
| 288. | Ajaya Ketan Nayak, Aya Hagishima, Jun Tanimoto, A simplified numerical model for evaporative cooling by water spray over roof surfaces, APPLIED THERMAL ENGINEERING, 10.1016/j.applthermaleng.2019.114514, 165, 2020.01, © 2019 Elsevier Ltd Evaporative cooling is a well-known passive technique adopted especially in hot and dry climatic regions. This paper presents a simplified numerical model to assess the impact of water spray over roof surfaces on the building thermal load. First, we performed a series of long-term outdoor measurements of heat fluxes from an asphalt pavement and roof top of a laboratory building waterproofed by asphalt sheet. Based on the measured data, a correlation is proposed to estimate the evaporation rate of the concerned surfaces after rain showers. A simplified numerical model is then developed using this correlation based on the unsteady heat transfer to analyze the effect of precipitation and artificial water spray on the roof of the laboratory building. Simulation is performed with the help MATLAB using the hourly weather data from Fukuoka, Japan, and the simulated results are found to be in correspondence with the measured data. Finally, the cooling effect achieved by varying the amount and rate of water spray over the roof is compared to find out the optimum spraying conditions. The novelty of this study is that, in this model, the evaporation rate can be expressed in terms of the evaporation ratio, which is defined as a function of the water content of the surface layer of the roof. The water content of the surface layer can be obtained by the water balance equation, which is coupled dynamically with conductive equations. This procedure can drastically reduce the calculation load compared to the conventionally applied simultaneous hygrothermal transfer equation.. |
| 289. | Kazuki Kuga, Masaki Tanaka, Jun Tanimoto, Pair approximation model for the vaccination game: predicting the dynamic process of epidemic spread and individual actions against contagion, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 10.1098/rspa.2020.0769, 477, 2246, 20200769-20200769, 2021.02, We successfully establish a theoretical framework of pairwise approximation for the vaccination game in which both the dynamic process of epidemic spread and individual actions in helping prevent social behaviours are quantitatively evaluated. In contrast with mean-field approximation, our model captures higher-order effects from neighbours by using an underlying network that shows how the disease spreads and how individual decisions evolve over time. This model considers not only imperfect vaccination but also intermediate protective measures other than vaccines. Our analytical predictions are validated by multi-agent simulation results that estimate random regular graphs at varying degrees.. |
| 290. | C. Hirose, N. Ikegaya, A. Hagishima, J. Tanimoto, Indoor airflow and thermal comfort in a cross-ventilated building within an urban-like block array using large-eddy simulations, Building and Environment, 10.1016/j.buildenv.2021.107811, 196, 2021.06, This study characterizes the indoor airflow and occupants’ thermal sensations in a cross-ventilated building model sheltered by generic cube arrays based on large-eddy simulations (LESs). Four ventilation models, which comprise different cross-ventilating openings, streamwise (STR) and lateral (LAT) windows, and block arrangements, lattice-type square (SQ) and staggered (ST) patterns, were examined to understand the following geometry-oriented features: i) the temporal and spatial deviations of wind speed at openings and inside the ventilation models, ii) effects of time and space resolutions for the velocity data on the estimation accuracy of the ventilation rate, and iii) predicted mean vote (PMV) and predicted percentage of dissatisfied (PPD) indices calculated with elaborately simulated velocity data. The difference in distribution of fluctuating normal velocity at openings was more significant when varying the conditions of the opening locations than that observed when varying the building arrangements. Therefore, the ventilation rates in the STR conditions were reasonably estimated using only the time-averaged flow rate at the center position of the windward opening; meanwhile, when the contributions of reverse flow were ignored at the openings, the ventilation rates in the LAT conditions were drastically underestimated using highly resolved velocity data at openings. Based on the thermal comfort assessment at an air temperature of 26°C, the discrepancies of area-averaged PMV values between STR and LAT cases were within 0.7 and 0.9 at the lower and middle heights of naturally ventilated buildings, resulting in a 5% difference in the PPD values.. |
| 291. | K. Nagata, N. Ikegaya, J. Tanimoto, Consideration of artificial compressibility for explicit computational fluid dynamics simulation, Journal of Computational Physics, 10.1016/j.jcp.2021.110524, 443, 2021.10, In this paper, we discuss the theoretical interpretation of the artificial compressibility method (ACM) to propose a new explicit method for the unsteady numerical simulation of fluid flow. The proposed method employs the compressible continuity and Navier–Stokes equations, which facilitates the replacement of pressure as one of the major variables with density, theoretically backed by virtual particle concept. This new concept justifies the theoretical treatment assuming the speed of sound in ACM as a model parameter determined by the grid system. More importantly, the present method realizes, in a fully explicit manner, the solving of a set of equations, which prevents the solving of the Poisson equation of pressure. The new method was validated and proven by comparing the results of two-dimensional cavity flow between the proposed method, conventional incompressible method, and the Lattice–Boltzmann method with varying Reynolds numbers (100, 1000, and 10000). The results of the proposed method agree well with conventional and reference data for both steady-state and unsteady-state conditions, although slight numerical oscillations were observed for the proposed method at a Reynolds number of 10000. Thus, the numerical validation assures that the proposed method is an explicit method based on a solid theoretical ground to be a new efficient simulation framework.. |
| 292. | Ryosuke Fukami, Aya Hagishima, Jun Tanimoto, Naoki Ikegaya, Stochastic nature of occupants' behavior toward air-conditioning operation in residential buildings, JAPAN ARCHITECTURAL REVIEW, 10.1002/2475-8876.12293, 5, 4, 649-660, 2022.10, Occupants' behaviors (OBs) toward air conditioning (AC) usage in residential buildings have a strong influence on diverse time patterns of load profiles; thus, various stochastic OB modeling has been proposed. However, the validity of such models has not been fully assessed with metered data, particularly for modeling AC switching-off actions. In this study, the AC operation behavior of 20 dwellings in Japan was observed during the summer. The occurrence of AC-use events identified from the measured data was analyzed in relation to the time slot of an event, thermal conditions, and frequency of AC usage in each dwelling. The results exhibited a difference between switch-on and switch-off actions; the former is primarily dominated by indoor temperature because of thermal adaptation behavior, while the latter is more habitual. Based on this analysis, this study proposed a revised algorithm to synthesize AC operation schedules, which expresses the switch-off action as the probability of the duration of an AC-use event rather than a state transition probability function. The proposed algorithm can be incorporated into dynamic building energy simulations. The validity of the revised algorithm was also demonstrated through comparison with the measured data.. |
| 293. | Jiajun Lyu, Tetsushi Ono, Ataru Sato, Aya Hagishima, Jun Tanimoto, Seasonal variation of residential cooling use behaviour derived from energy demand data and stochastic building energy simulation, JOURNAL OF BUILDING ENGINEERING, 10.1016/j.jobe.2022.104067, 49, 2022.05, In recent years, a bottom-up approach based on building-energy simulations coupled with stochastic modelling of occupant behaviours has been intensively developed to properly estimate the effect of diverse and stochastic occupant behaviours on energy loads, mainly for developing smart building-energy-management systems and the promotion of renewable energy sources. Considering this background, the objective of this study is to elucidate the modelling of the state transitional probability of occupants’ heat pump (HP) use embedded in most bottom-up approaches based on statistical analysis of the 2-year electricity data of 586 dwellings. The analysis results clearly suggested that the relationship between daily hours of HP use and the daily mean outdoor air temperature has seasonal differences, in which frequency of HP use in early summer and early winter is lower than that in late summer and late winter under the same daily mean outdoor air temperature conditions. In addition, the authors presented statistical models of daily HP use hours with an explanatory variable of outdoor temperature for a lapse of 10 days to model the seasonal influence, and showed better performance compared to the model expressed by daily mean outdoor temperature. Furthermore, the authors revealed that such a seasonal change in behaviour is attributed to the state transitional probability of cooling use as a function of indoor thermal conditions based on a numerical simulation of the bottom-up approach. Finally, the authors proposed a revised model with the state transitional probability considering seasonal behaviour change, and the estimation results of household cooling use are consistent with the measured data.. |
| 294. | Tetsushi Ono, Aya Hagishima, Jun Tanimoto, Non-Intrusive Detection of Occupants' On/Off Behaviours of Residential Air Conditioning, SUSTAINABILITY, 10.3390/su142214863, 14, 22, 2022.11, Understanding occupants’ behaviours (OBs) of heating and cooling use in dwellings is essential for effectively promoting occupants’ behavioural change for energy saving and achieving efficient demand response operation. Thus, intensive research has been conducted on data collection, statistical analysis, and modelling of OBs. However, the majority of smart metres currently deployed worldwide monitor only the total household consumption rather than appliance-level load. Therefore, estimating the turn-on/off state of specific home appliances from the measured household total electricity referred to as non-intrusive load monitoring (NILM), has gained research attention. However, the current NILM methods overlook the specific features of inverter-controlled heat pumps (IHPs) used for space heating/cooling; thus, they are unsuitable for detecting OBs. This study presents a rule-based method for identifying the occupants’ intended operation states of IHPs based on a statistical analysis of load data monitored at 423 dwellings. This method detects the state of IHPs by subtracting the power of sequential-operation appliances other than IHPs from the total household power. Three time-series characteristics, including the durations of power-on/off states and power differences between power-off/on states, were used for this purpose. The performance of the proposed method was validated, indicating an F-score of 0.834.. |
| 295. | Tetsushi Ono, Aya Hagishima, Jun Tanimoto, Evaluation of potential for peak demand reduction of residential buildings by household appliances with demand response, ELECTRONICS AND COMMUNICATIONS IN JAPAN, 10.1002/ecj.12379, 105, 4, 2022.12, Residential appliances remotely controlled by IoT for demand response has attracted much attention for effective peak demand reduction of the uncertainty of consumers’ behaviors. To promote the technology development of such appliances, estimation of the potential for peak demand reduction according to the type of appliances is strongly needed. With this background, the authors conducted a data analysis of demand curves of not only the entire household but also the branches acquired at 496 dwellings in Osaka. Based on this analysis, the potential of peak reduction of aggregated demand of various groups with different dwelling size were quantified for major five appliances, namely air conditioners, microwave ovens, refrigerators, washing machines, and dish washers.. |
| 296. | Kazuki Kuga, Jun Tanimoto, Effects of void nodes on epidemic spreads in networks, SCIENTIFIC REPORTS, 10.1038/s41598-022-07985-9, 12, 1, 2022.03, |
| 297. | Yoshiro Iwamura, Keisuke Nagashima, Jun Tanimoto, Evolutionary dynamics of a 3-strategy game Cooperator, defector and costly cooperative loner strategic types, Applied Mathematics and Computation, 10.1016/j.amc.2019.124889, 370, 2020.04, [URL], Limiting the analysis to the so-called prisoner's dilemma situation, a new framework of 3-strategy game is proposed herein by adding a costly cooperative loner (CL) to the original strategies; cooperator and defector. Relaying on the replicator dynamics that presumes an infinite and well-mixed population, a set of equilibria is deliberately drawn. In contrast to the expectations from this study, the introduction of CL did not substantially alter the evolutionary trails and always ended with all-defectors state. Some arguments on why such counter-intuitive result comes about is are discussed. The outcomes are justified by the CL's dependency on the other two strategic types and the reduced power in foiling defectors compared to the paradigmatic costly punisher model.. |
| 298. | Md Rajib Arefin, K. M.Ariful Kabir, Jun Tanimoto, A mean-field vaccination game scheme to analyze the effect of a single vaccination strategy on a two-strain epidemic spreading, Journal of Statistical Mechanics: Theory and Experiment, 10.1088/1742-5468/ab74c6, 2020, 3, 2020.03, [URL], We propose a mean-field vaccination game framework that combines two distinct processes: The simultaneous spreading of two strains of an influenza-like disease, and the adoption of vaccination based on evolutionary game theory presuming an infinite and well-mixed population. The vaccine is presumed to be imperfect such that it shows better efficacy against the original (resident) strain rather than the new one (mutant). The vaccination-decision takes place at the beginning of an epidemic season and depends upon the vaccine-effectiveness along with the cost. Additionally, we explore a situation if the original strain continuously converts to a new strain through the process of mutation. With the aid of numerical experiments, we explore the impact of vaccinating behavior on a specific strain prevalence. Our results suggest that the emergence of vaccinators can create the possibility of infection-prevalence of the new strain if the vaccine cannot bestow a considerable level of efficiency against that strain. On the other hand, the resident strain can continue to dominate under large-scale vaccine avoidance. Moreover, in the case of continuous mutation, the vaccine efficacy against the new strain plays a pivotal role to control the disease prevalence. We successfully obtain phase diagrams, displaying the infected fraction with each strain, final epidemic size, vaccination coverage, and average social payoff considering two-different strategy-update rules and provide a comprehensive discussion to get an encompassing idea, justifying how the vaccinating behavior can affect the spread of a disease having two strains. Highlights-We build a mean-field vaccination game scheme to analyze the effect of an imperfect vaccine on a two-strain epidemic spreading taking into account individuals' vaccination behavior.-En masse vaccine avoidance can enhance the possibility of the original strain prevalence.-Propensity for vaccination can create the possibility of infection by the new strain if the vaccine is unable to provide a considerable level of efficiency against that strain.. |
| 299. | Muntasir Alam, K. M.Ariful Kabir, Jun Tanimoto, Based on mathematical epidemiology and evolutionary game theory, which is more effective Quarantine or isolation policy, Journal of Statistical Mechanics: Theory and Experiment, 10.1088/1742-5468/ab75ea, 2020, 3, 2020.03, [URL], Outbreaks of repeated pandemics and heavy epidemics are daunting threats to human life. This study aims at investigating the dynamics of disease conferring temporary or waning immunity with several forced-control policies aided by vaccination game theory. Considering an infinite and well-mixed homogenous population, our proposed model further illustrates the significance of introducing two well-known forced control techniques, namely, quarantine and isolation, in order to model the dynamics of an infectious disease that spreads within a human population where pre-emptive vaccination has partially been taken before the epidemic season begins. Moreover, we carefully examine the combined effects of these two types (pre-emptive and forced) of protecting measures using the SEIR-type epidemic model. An in-depth investigation based on evolutionary game theory numerically quantifies the weighing impact of individuals' vaccinating decisions to improve the efficacy of forced control policies leading up to the relaxation of the epidemic spreading severity. A deterministic SVEIR model, including vaccinated (V) and exposed (E) states, is proposed having no spatial structure while implementing these intervention techniques. This study uses a mixed control strategy relying on quarantine and isolation policies to quantify the optimum requirement of vaccines for eradicating disease prevalence completely from human societies. Furthermore, our theoretical study justifies the fact that adopting forced control policies significantly reduces the required level of vaccination to suppress emerging disease prevalence, and it also confirms that the joint policy works even better when the epidemic outbreak takes place at a higher transmission rate. Research reveals that the isolation policy is a better disease attenuation tool than the quarantine policy, especially in endemic regions where the disease progression rate is relatively higher. However, a meager progression rate gradually weakens the speed of an epidemic outbreak and, therefore, applying a moderate level of control policies is sufficient to restore the disease-free state. Essentially, positive measures (pre-emptive vaccination) regulate the position of the critical line between two phases, whereas exposed provisions (quarantine or isolation) are rather dedicated to mitigating the disease spreading in endemic regions. Thus, an optimal interplay between these two types of intervention techniques works remarkably well in attenuating the epidemic size. Despite having advanced on the development of new vaccines and control strategies to mitigate epidemics, many diseases like measles, tuberculosis, Ebola, and flu are still persistent. Here, we present a dynamic analysis of the SVEIR model using mean-field theory to develop a simple but efficient strategy for epidemic control based on the simultaneous application of the quarantine and isolation policies. Highlights • This model incorporates the elements of mathematical epidemiology and a vaccination game into a single framework. • A dynamical analysis of the SEIR/V epidemic model equipped with quarantine and isolation policies is introduced. • The proposed game-theoretic framework rigorously addresses real situations when control policies are adopted simultaneously as well as separately. • Adopting control policies can significantly reduce the required level of vaccination to suppress disease prevalence. • A joint policy seems impressive when an epidemic outbreak takes place at a higher transmission rate. • For a smaller basic reproduction number, the quarantine policy outperforms the isolation policy.. |
| 300. | KM Ariful Kabir, Kazuki Kuga, Jun Tanimoto, The impact of information spreading on epidemic vaccination game dynamics in a heterogeneous complex network- A theoretical approach, Chaos, solitons and fractals, 10.1016/j.chaos.2019.109548, 132, 2020.03, [URL], A modified susceptible-vaccinated-infected-recovered (SIR/V) with unaware-aware (UA) epidemic model in heterogeneous networks is presented to study the effect of information spreading in the spatial structure of the vaccination game on epidemic dynamics. Two layers SIR/V epidemic model is considered to elucidate information spreading, where the fraction of susceptible, vaccinated and infected individuals are parted as unaware and aware state as each susceptible and vaccinated persons are allied with their infected neighbors by a spatial structure, say, an underlying network. The context deduces epidemic vaccination game with awareness influence dynamics in one single season followed by a strategy update process that refer an individual to take imperfect vaccination or not. We considered two different strategy updating rules: individual based risk assessment (IB-RA) and strategy-based risk assessment (SB-RA) to explore how different underlying network topologies, say, random graph and scale free networks, subsequently giving impact on the final epidemic size, vaccination coverage and average social payoff through the effect of information spreading on epidemic. Thus, it can be seen that, awareness can enhance the epidemic threshold effectiveness and lessen the spreading of infection in a scale free network other than random graph and homogeneous network.. |
| 301. | M. D. Ahsan Habib, K. M. Ariful Kabir, Jun Tanimoto, “Do humans play according to the game theory when facing the social dilemma situation?” A survey study, Evergreen, 10.5109/2740936, 7, 1, 7-14, 2020.03, [URL], The aim of this study is to verify whether a human can detect the social dilemma class and its strength for four various games: Prisoner’s dilemma, Trivial, Chicken, and Stag-Hunt by using a web-based structural cross-sectional survey. We considered respondent’s cooperative and defective behavior by designing multiple sets of 2 × 2 games for two classes in terms of game opponents: whether he is an intimate friend or an unknown person in the questionnaire. In total, 375 respondents participated in this survey. We found that Prisoner’s dilemma and Trivial game are recognized easily by the respondents, but they are not aware of the dilemma strength and difference of game opponent’s attribute whether the opponent is a close or unknown person.. |
| 302. | Masaki Tanaka, Jun Tanimoto, Is subsidizing vaccination with hub agent priority policy really meaningful to suppress disease spreading?, Journal of Theoretical Biology, 10.1016/j.jtbi.2019.110059, 486, 2020.02, [URL], A Multi Agent Simulation (MAS) model that joins evolutionary game theory with epidemiological dynamics is established. Various subsidy policies that encourage vaccination are evaluated quantitatively with the model. The underlying social network topology is based on a scale-free network. Individual subsidies for vaccinations can be directed to hub agents with priority, to efficiently suppress the overall social cost of a vaccination program. These hub agents are more likely to spread both knowledge about vaccination and the disease in question. Our comprehensive simulations showed that this intuitively appealing strategy cannot be effective if the vaccination cost is low and the vaccination budget is small. Thus, we find that the hub agent priority strategy is not always effective.. |
| 303. | Ajaya ketan Nayak, Aya Hagishima, Jun Tanimoto, A simplified numerical model for evaporative cooling by water spray over roof surfaces, Applied Thermal Engineering, 10.1016/j.applthermaleng.2019.114514, 165, 2020.01, [URL], Evaporative cooling is a well-known passive technique adopted especially in hot and dry climatic regions. This paper presents a simplified numerical model to assess the impact of water spray over roof surfaces on the building thermal load. First, we performed a series of long-term outdoor measurements of heat fluxes from an asphalt pavement and roof top of a laboratory building waterproofed by asphalt sheet. Based on the measured data, a correlation is proposed to estimate the evaporation rate of the concerned surfaces after rain showers. A simplified numerical model is then developed using this correlation based on the unsteady heat transfer to analyze the effect of precipitation and artificial water spray on the roof of the laboratory building. Simulation is performed with the help MATLAB using the hourly weather data from Fukuoka, Japan, and the simulated results are found to be in correspondence with the measured data. Finally, the cooling effect achieved by varying the amount and rate of water spray over the roof is compared to find out the optimum spraying conditions. The novelty of this study is that, in this model, the evaporation rate can be expressed in terms of the evaporation ratio, which is defined as a function of the water content of the surface layer of the roof. The water content of the surface layer can be obtained by the water balance equation, which is coupled dynamically with conductive equations. This procedure can drastically reduce the calculation load compared to the conventionally applied simultaneous hygrothermal transfer equation.. |
| 304. | K. M. Ariful Kabir, Marko Jusup, Jun Tanimoto, Behavioral incentives in a vaccination-dilemma setting with optional treatment, Physical Review E, 10.1103/PhysRevE.100.062402, 100, 6, 2019.12, [URL], Social dilemmas are situations wherein individuals choose between selfish interest and common good. One example of this is the vaccination dilemma, in which an individual who vaccinates at a cost protects not only himself but also others by helping maintain a common good called herd immunity. There is, however, a strong incentive to forgo vaccination, thus avoiding the associated cost, all the while enjoying the protection of herd immunity. To analyze behavioral incentives in a vaccination-dilemma setting in which an optional treatment is available to infected individuals, we combined epidemiological and game-theoretic methodologies by coupling a disease-spreading model with treatment and an evolutionary decision-making model. Extensive numerical simulations show that vaccine characteristics are more important in controlling the treatment adoption than the cost of treatment itself. The main effect of the latter is that expensive treatment incentivizes vaccination, which somewhat surprisingly comes at a little cost to society. More surprising is that the margin for a true synergy between vaccine and treatment in reducing the final epidemic size is very small. We furthermore find that society-centered decision making helps protect herd immunity relative to individual-centered decision making, but the latter may be better in establishing a novel vaccine. These results point to useful policy recommendations as well as to intriguing future research directions.. |
| 305. | Jun Tanimoto, Kyaw Thu, Hiroshi Furuno, Editorial, Evergreen, 10.5109/2547344, 6, 4, ii-iii, 2019.12, [URL].  |
| 306. | Md Rajib Arefin, Tanaka Masaki, K. M. Ariful Kabir, Jun Tanimoto, Interplay between cost and effectiveness in influenza vaccine uptake A vaccination game approach, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 10.1098/rspa.2019.0608, 475, 2232, 2019.12, [URL], Pre-emptive vaccination is regarded as one of the most protective measures to control influenza outbreak. There are mainly two types of influenza viruses-influenza A and B with several subtypes-that are commonly found to circulate among humans. The traditional trivalent (TIV) flu vaccine targets two strains of influenza A and one strain of influenza B. The quadrivalent (QIV) vaccine targets one extra B virus strain that ensures better protection against influenza; however, the use of QIV vaccine can be costly, hence impose an extra financial burden to society. This scenario might create a dilemma in choosing vaccine types at the individual level. This article endeavours to explain such a dilemma through the framework of a vaccination game, where individuals can opt for one of the three options: choose either of QIV or TIV vaccine or none. Our approach presumes a mean-field framework of a vaccination game in an infinite and well-mixed population, entangling the disease spreading process of influenza with the coevolution of two types of vaccination decision-making processes taking place before an epidemic season. We conduct a series of numerical simulations as an attempt to illustrate different scenarios. The framework has been validated by the so-called multi-agent simulation (MAS) approach.. |
| 307. | K. M. Ariful Kabir, Jun Tanimoto, Modelling and analysing the coexistence of dual dilemmas in the proactive vaccination game and retroactive treatment game in epidemic viral dynamics, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 10.1098/rspa.2019.0484, 475, 2232, 2019.12, [URL], The dynamics of a spreadable disease are largely governed by four factors: proactive vaccination, retroactive treatment, individual decisions, and the prescribing behaviour of physicians. Under the imposed vaccination policy and antiviral treatment in society, complex factors (costs and expected effects of the vaccines and treatments, and fear of being infected) trigger an emulous situation in which individuals avoid infection by the pre-emptive or ex post provision. Aside from the established voluntary vaccination game, we propose a treatment game model associated with the resistance evolution of antiviral/antibiotic overuse. Moreover, the imperfectness of vaccinations has inevitably led to anti-vaccine behaviour, necessitating a proactive treatment policy. However, under the excessively heavy implementation of treatments such as antiviral medicine, resistant strains emerge. The model explicitly exhibits a dual social dilemma situation, in which the treatment behaviour changes on a local time scale, and the vaccination uptake later evolves on a global time scale. The impact of resistance evolution and the coexistence of dual dilemmas are investigated by the control reproduction number and the social efficiency deficit, respectively.. |
| 308. | Keisuke Nagashima, Jun Tanimoto, A stochastic Pairwise Fermi rule modified by utilizing the average in payoff differences of neighbors leads to increased network reciprocity in spatial prisoner's dilemma games, Applied Mathematics and Computation, 10.1016/j.amc.2019.05.034, 361, 661-669, 2019.11, [URL], In a 2 × 2 prisoner's dilemma (PD) game, network reciprocity is one of the mechanisms for increasing social viscosity, which leads to a cooperative equilibrium. The Pairwise Fermi (PW-Fermi) rule has been accepted as an updating protocol, as its stochasticity is similar to the real-world human decision-making process. In this paper, we elucidated a modification to the PW-Fermi rule by utilizing the averaged payoff difference instead of the simple payoff difference between a focal agent and their neighbors. This led to a significantly enhanced level of network reciprocity. The mechanism of this enhancement is clarified by discussing the concepts of the enduring period (END) and the expanding period (EXP).. |
| 309. | K. M.Ariful Kabir, Jun Tanimoto, Vaccination strategies in a two-layer SIR/V–UA epidemic model with costly information and buzz effect, Communications in Nonlinear Science and Numerical Simulation, 10.1016/j.cnsns.2019.04.007, 76, 92-108, 2019.09, [URL], The promptness with which individuals respond to information has an important effect on the spread of epidemics. To study this effect, we establish a two-layer SIR/V epidemic model that incorporates the effects of information buzz and information costs in the framework of a vaccination game. Previous studies on this issue have generally assumed that only unaware people can become aware, and the relative vaccination cost is used to update their strategies for avoiding infection. Firstly, we introduce the idea that aware people can also become unaware because of a wicked rumor about a beneficial practice. Secondly, the relative cost of information is modeled for individual update strategies in a novel way of framing a game by introducing a two-strategy and 2 (information state A/UA) by 2(healthy/infected) state game, referred to as a two-under-two game. In this framework, susceptible, infected, and vaccinated individuals are divided into two states as unaware and aware, and recovered individuals are assumed to be aware, for an unbounded and well-mixed population. Information about wearing masks or taking other protection against diseases spreads locally for a season, and this information has a significant tendency to reduce the extent of contagious disease that persists through each generation of the model. Mathematical analysis shows that funds spent on awareness can reduce the vaccination cost and improve the epidemic threshold under certain conditions.. |
| 310. | Jun Tanimoto, Kyaw Thu, Hiroshi Furuno, Editorial, Evergreen, 6, 3, ii-iii, 2019.09. |
| 311. | Muntasir Alam, Masaki Tanaka, Jun Tanimoto, A game theoretic approach to discuss the positive secondary effect of vaccination scheme in an infinite and well-mixed population, Chaos, solitons and fractals, 10.1016/j.chaos.2019.05.031, 125, 201-213, 2019.08, [URL], Pre-emptive vaccination policy used in controlling the rapid spreading of infectious diseases is considered as one of the most challenging issues imposed to mankind, causing enormous death tolls over the years. This paper dedicatedly studies the dilemma effect coming from the failure of getting perfect immunity to those individuals who committed vaccination earlier. Therefore, we propose a new theoretical model that slows down the infection spreading and also facilitates quicker recovery time than what the previous model does even if a vaccinator fails to obtain perfect immunity. We name this effect as the “positive secondary effect” of vaccination as it gives a second chance to the vaccinators which in return subdues the rapid spreading that helps in producing better social average payoff as well as keeping the final epidemic size smaller. Moreover, to address the positive secondary effect more precisely, we introduce two different parameters; namely, relaxation parameter (η) and foster parameter (δ) in two different directions to quantify the individual effects resulting from each of the parameter space as well as their superposition effect. An in-depth discussion focuses on the influential role played by our proposed model via discounting and faster recovery effects while a second chance is given to the vaccinators. In addition, we also examine the situation when discounting effect brought by η outperforms very much than its faster recovery controlled by δ as well as the superposition effects. Unlike all previous studies dealing with vaccination game, we pay much attention to investigating the secondary effect of imperfect vaccination policy. Our proposed theoretical scheme completely reproduces the decision-making process of choosing an imperfect provision based on evolutionary game theory entailed with the widely used SIR (Susceptible–Infected–Recovered) epidemic model. Without considering any spatial structure and perfect vaccination policy, our model presumes the population being infinite and well-mixed to represent the infection spreading dynamics mathematically. This study is conducted throughout using the so-called theoretical approach. Besides that, three different updating rules based on evolutionary game theory have also been considered to investigate all possible situations. Later on, we draw 2D full phase diagrams showing the final epidemic size, vaccination coverage, and average social payoff quantitatively. Finally, our theoretical result is compared with the counterpart result obtained from the multi-agent simulation (MAS) approach and a good agreement is found, hence the appropriateness of the proposed model is fully justified.. |
| 312. | C. Hirose, Naoki Ikegaya, Aya Hagishima, Jun Tanimoto, Outdoor measurement of wall pressure on cubical scale model affected by atmospheric turbulent flow, Building and Environment, 10.1016/j.buildenv.2019.106170, 160, 2019.08, [URL], Most studies on indoor ventilation have utilized wind-tunnel experiments (WTEs) or computational fluid dynamics based approaches under well-controlled flow conditions. However, the effects of urban boundary layer flow with variable wind directions and various turbulence scales on the ventilation driven by the pressure differences between the upwind and downwind sides of a building within a block array is still under discussion. Therefore, we conducted outdoor experiments at comprehensive outdoor scale model (COSMO) experiment sites in an urban climate to clarify the relationships between the building wall pressure differences and the approaching flow. The pressure coefficients for the outdoor site were comparable with those obtained during previous WTEs. Accordingly, temporal variations in the wind speed and pressure coefficient on the target block were investigated in detail using low-pass filtering operations. The relationships between the filtered wind speed and the pressure differences indicate that the slower temporal variations in the wall pressure showed good agreement with the filtered approaching flow. In addition, the correlation coefficient between the filtered wind speed and the wall pressure differences quantified the apparent coherence between the turbulent flow and the ventilation rate. Furthermore, the statistics of the ventilation rate were determined based on the conventional model to clarify the effects of the turbulent flow on the natural ventilation rate. The ratios between the mean and short-term ventilation rates imply that the short-term ventilation rate presented dramatic temporal fluctuations owing to the various scale turbulence generated by the atmospheric flow.. |
| 313. | Tetsushi Ono, Aya Hagishima, Jun Tanimoto, Sheikh Ahmad Zaki, Naja Aqilah Hisham, Statistical analysis of air conditioning peak loads of multiple dwellings, 13th REHVA World Congress, CLIMA 2019 E3S Web of Conferences, 10.1051/e3sconf/201911104057, 111, 2019.08, [URL], Evaluation of the aggregated air-conditioning load of multiple dwellings is important for demand response through the optimum control of numerous air-conditioners (A/Cs), for development of smart-city or smart-community technologies. However, past studies have mainly focused on the characteristics of A/C load in a single household. With this background, the authors conducted statistical analysis of time-series data for A/C electricity consumption in 489 dwellings in Osaka, Japan, and 20 dwellings in Kuala Lumpur, Malaysia to grasp the feature of aggregated A/C load of multiple dwellings. The findings of this analysis are followings: 1) the aggregated A/C load peak per dwelling decreased by almost 50% as the number of dwellings increased from 1 to 10, due to the offset of the diverse time-patterns of A/C load. 2) The occurrence of the top 2.5% A/C load shows strong time and date dependency for an A/C load aggregated by many dwellings.. |
| 314. | K. M.Ariful Kabir, Jun Tanimoto, Analysis of epidemic outbreaks in two-layer networks with different structures for information spreading and disease diffusion, Communications in Nonlinear Science and Numerical Simulation, 10.1016/j.cnsns.2019.01.020, 72, 565-574, 2019.06, [URL], A two-layer susceptible-infected-recovered/unaware-aware (SIR-UA) epidemic model is presented to analyze the effect of different heterogeneous networks in a population. Random, scale-free, and small-world network topologies are tested to investigate the impact of awareness on the spread of epidemics in a two-layer network with diverse combinations of degree and structure. Susceptible and infected (both unaware and aware) individuals are associated with their neighboring nodes in a social network structure with various degree distributions. In the two-layer SIR-UA epidemic model, a virtual network represents the connections that spread information, while a physical network represents the physical social interactions that spread diseases. We test various combinations of network structures in virtual or physical networks, to understand the impact of information diffusion on the spread of epidemics in a heterogeneous network structure. Then, the effects of awareness on the spread of a disease are discussed. Finally, phase diagrams are illustrated to reveal the final regions covered by an epidemic with various network parameters. We find that a disease spreads less if the virtual social network is more connected than the network of physical connections.. |
| 315. | K. M.Ariful Kabir, Jun Tanimoto, Dynamical behaviors for vaccination can suppress infectious disease – A game theoretical approach, Chaos, solitons and fractals, 10.1016/j.chaos.2019.04.010, 123, 229-239, 2019.06, [URL], To avoid the infection, the epidemic outburst plays a significant role that encourages people to take vaccination and induce behavioral changes. The interplay between disease incidence, vaccine uptake and the behavior of individuals are taking place on the local time scale. Here, we analyze the individual's behavior in disease-vaccination interaction model based on the evolutionary game approach that captures the idea of vaccination decisions on disease prevalence that also include social learning. The effect of herd immunity is partly important when the individuals are deciding whether to take the vaccine or not. The possibility that an individual taking a vaccination or becoming infected depends upon how many other people are vaccinated. To apprehend this interplay, four strategy updating rules: individual based risk assessment (IB-RA), society based risk assessment (SB-RA), direct commitment (DC) and modified replicator dynamics (MRD) are contemplated for game theoretical approach by how one individual can learn from society or neighbors. The theory and findings of this paper provide a new perspective for vaccination taking policy in daily basis that provision of prompt learning with the collective information reliefs to reduce infection, which gives a new ‘vaccination game’ from other previous models.. |
| 316. | Jun Tanimoto, Kyaw Thu, Hiroshi Furuno, Nasruddin, Mohd Fairus Mohd Yasin, Muhammad Arif Budiyanto, Editorial, Evergreen, 10.1007/s11282-007-0065-z, 6, 2, iii-iv, 2019.06, [URL]. |
| 317. | K. M. Ariful Kabir, Jun Tanimoto, Analysis of epidemic outbreaks in two-layer networks with different structures for information spreading and disease diffusion, COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION, 10.1016/j.cnsns.2019.01.020, 72, 565-574, 2019.06, A two-layer susceptible-infected-recovered/unaware-aware (SIR-UA) epidemic model is presented to analyze the effect of different heterogeneous networks in a population. Random, scale-free, and small-world network topologies are tested to investigate the impact of awareness on the spread of epidemics in a two-layer network with diverse combinations of degree and structure. Susceptible and infected (both unaware and aware) individuals are associated with their neighboring nodes in a social network structure with various degree distributions. In the two-layer SIR-UA epidemic model, a virtual network represents the connections that spread information, while a physical network represents the physical social interactions that spread diseases. We test various combinations of network structures in virtual or physical networks, to understand the impact of information diffusion on the spread of epidemics in a heterogeneous network structure. Then, the effects of awareness on the spread of a disease are discussed. Finally, phase diagrams are illustrated to reveal the final regions covered by an epidemic with various network parameters. We find that a disease spreads less if the virtual social network is more connected than the network of physical connections. (C) 2019 Elsevier B.V. All rights reserved.. |
| 318. | Jun Tanimoto, Xie An, Improvement of traffic flux with introduction of a new lane-change protocol supported by Intelligent Traffic System, Chaos, solitons and fractals, 10.1016/j.chaos.2019.03.007, 122, 1-5, 2019.05, [URL], A new Cellular Automata traffic model based on Revised S-NFS model was established, which considers traffic density ahead of a car in next 50 [m] and also accounts for a decision making process of whether a lane change should be tried or not so as to diminish the frequency of meaningless lane-changes. It intends to be applied as one of the protocols to improve traffic efficiency in premise with Intelligence Traffic System (ITS) that is able to provide information on traffic density next hundred meters in front of a focal vehicle. A series of systematic simulations reveals that the presented lane changing protocol enhances traffic flux vis-à-vis the conventional lane change rule based on the traditional incentive criterion and safe criterion. Social dilemma analysis suggests our new protocol mitigates a strong social dilemma encouraged by a competition between a cooperator; not intending any lane-changes and a defector; trying to lane-changes to minimize his own travel time.. |
| 319. | Kazuki Kuga, Jun Tanimoto, Marko Jusup, To vaccinate or not to vaccinate A comprehensive study of vaccination-subsidizing policies with multi-agent simulations and mean-field modeling, Journal of Theoretical Biology, 10.1016/j.jtbi.2019.02.013, 469, 107-126, 2019.05, [URL], We combined the elements of evolutionary game theory and mathematical epidemiology to comprehensively evaluate the performance of vaccination-subsidizing policies in the face of a seasonal epidemic. We conducted multi-agent simulations to, among others, find out how the topology of the underlying social networks affects the results. We also devised a mean-field approximation to confirm the simulation results and to better understand the influences of an imperfect vaccine. The main measure of a subsidy’ performance was the total social payoff as a sum of vaccination costs, infection costs, and tax burdens due to the subsidy. We find two types of situations in which vaccination-subsidizing policies act counterproductively. The first type arises when the subsidy attempts to increase vaccination among past non-vaccinators, which inadvertently creates a negative incentive for voluntary vaccinators to abstain from vaccination in hope of getting subsidized. The second type is a consequence of overspending at which point the marginal cost of further increasing vaccination coverage is higher than the corresponding marginal cost of infections avoided by this increased coverage. The topology of the underlying social networks considerably worsens the subsidy's performance if connections become random and heterogeneous, as is often the case in human social networks. An imperfect vaccine also worsens the subsidy's performance, thus narrowing or completely closing the window for vaccination-subsidizing policies to beat the no-subsidy policy. These results imply that subsidies should be aimed at voluntary vaccinators while avoiding overspending. Once this is achieved, it makes little difference whether the subsidy fully or partly offsets the vaccination cost.. |
| 320. | Muntasir Alam, Kazuki Kuga, Jun Tanimoto, Three-strategy and four-strategy model of vaccination game introducing an intermediate protecting measure, Applied Mathematics and Computation, 10.1016/j.amc.2018.10.015, 346, 408-422, 2019.04, [URL], We build a new analytic scheme that competently reproduces the decision-making process of choosing an imperfect provision based on the evolutionary game theory dovetailed with the SIR model for epidemic spreading dynamics. Aside from considering the two extreme options whether or not taking vaccination, we consider an ‘intermediate defense measure’ (IDM) that emulates hand-washing, masking, gargling, and taking energy drinks, defined as the third strategy while taking vaccination as well as IDM at the same time as the fourth strategy. In the present study, each of the proposed three imperfect provisions is able to oppress infectious diseases like Flu, Influenza, Ebola, and SARS during an epidemic season with certain extent. Considering an infinite and well-mixed population, a new analytic framework is built to take care of those three cases instead of perfect vaccination. Unlike MAS (multi-agent simulation) approach we conduct our study throughout using the so-called theoretical approach. Besides that, three different strategy updating rules based on evolutionary game theory have also been considered in our proposed model. We successfully obtain phase diagrams showing the final epidemic size, social average payoff and the respective fractions of the different strategy holders using various values of effectiveness and efficiency coefficients. Finally, a comprehensive discussion is made with comparison among the two-, three- and four- strategy models to get a holistic idea justifying how imperfect provisions work during an epidemic spreading.. |
| 321. | Muntasir Alam, Kazuki Kuga, Jun Tanimoto, Three-strategy and four-strategy model of vaccination game introducing an intermediate protecting measure, APPLIED MATHEMATICS AND COMPUTATION, 10.1016/j.amc.2018.10.015, 346, 408-422, 2019.04, We build a new analytic scheme that competently reproduces the decision-making process of choosing an imperfect provision based on the evolutionary game theory dovetailed with the SIR model for epidemic spreading dynamics. Aside from considering the two extreme options whether or not taking vaccination, we consider an 'intermediate defense measure' (IDM) that emulates hand-washing, masking, gargling, and taking energy drinks, defined as the third strategy while taking vaccination as well as IDM at the same time as the fourth strategy. In the present study, each of the proposed three imperfect provisions is able to oppress infectious diseases like Flu, Influenza, Ebola, and SARS during an epidemic season with certain extent. Considering an infinite and well-mixed population, a new analytic framework is built to take care of those three cases instead of perfect vaccination. Unlike MAS (multi-agent simulation) approach we conduct our study throughout using the so-called theoretical approach. Besides that, three different strategy updating rules based on evolutionary game theory have also been considered in our proposed model. We successfully obtain phase diagrams showing the final epidemic size, social average payoff and the respective fractions of the different strategy holders using various values of effectiveness and efficiency coefficients. Finally, a comprehensive discussion is made with comparison among the two-, three- and four-strategy models to get a holistic idea justifying how imperfect provisions work during an epidemic spreading. (C) 2018 Elsevier Inc. All rights reserved.. |
| 322. | K. M.Ariful Kabir, Jun Tanimoto, Evolutionary vaccination game approach in metapopulation migration model with information spreading on different graphs, Chaos, solitons and fractals, 10.1016/j.chaos.2019.01.013, 120, 41-55, 2019.03, [URL], The two layer SIR/V-UA epidemic diffusion model is incorporated in metapopulation migration model for random walkers to study the impact of awareness (rumor) for evolutionary vaccination game approach. In metapopulation, each node denoted a sub-population where the individuals migrate from one node to another by random walk following different graphs; star, cycle, wheel and complete. The framework of epidemic migration model in vaccination game with information spreading effect is observed in one single season as well as generation by some strategy update rules for an individual either taking vaccination or not. Furthermore, individuals in each node are divided into seven situations as; unaware susceptible, aware susceptible, unaware vaccinated, aware vaccinated, unaware infected, aware infected and recovered in a single season. Two strategy updating rules: individual based risk assessment (IB-RA) and strategy based risk assessment (SB-RA) are discussed for game theoretical approach for four new states; healthy vaccinated, infected vaccinated, successfully free rider and failed free rider at the end of each season to explore how different graphs of an underlying social network giving impact on the final epidemic size through the effect of information spreading in the complex population network with various number of nodes. Accordingly, the information spreading with migration in metapopulation model can enhance the epidemic threshold effectiveness and help to overcome on controlling disease diffusion.. |
| 323. | K. M. Ariful Kabir, Jun Tanimoto, Evolutionary vaccination game approach in metapopulation migration model with information spreading on different graphs, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2019.01.013, 120, 41-55, 2019.03, The two layer SIR/V-UA epidemic diffusion model is incorporated in metapopulation migration model for random walkers to study the impact of awareness (rumor) for evolutionary vaccination game approach. In metapopulation, each node denoted a sub-population where the individuals migrate from one node to another by random walk following different graphs; star, cycle, wheel and complete. The framework of epidemic migration model in vaccination game with information spreading effect is observed in one single season as well as generation by some strategy update rules for an individual either taking vaccination or not. Furthermore, individuals in each node are divided into seven situations as; unaware susceptible, aware susceptible, unaware vaccinated, aware vaccinated, unaware infected, aware infected and recovered in a single season. Two strategy updating rules: individual based risk assessment (IB-RA) and strategy based risk assessment (SB-RA) are discussed for game theoretical approach for four new states; healthy vaccinated, infected vaccinated, successfully free rider and failed free rider at the end of each season to explore how different graphs of an underlying social network giving impact on the final epidemic size through the effect of information spreading in the complex population network with various number of nodes. Accordingly, the information spreading with migration in metapopulation model can enhance the epidemic threshold effectiveness and help to overcome on controlling disease diffusion. (C) 2019 Elsevier Ltd. All rights reserved.. |
| 324. | K. M.Ariful Kabir, Kazuki Kuga, Jun Tanimoto, Analysis of SIR epidemic model with information spreading of awareness, Chaos, Solitons and Fractals, 10.1016/j.chaos.2018.12.017, 119, 118-125, 2019.02, [URL], The information spreading of awareness can prompt the manners of human to ease the infectious possibility and assist to recover swiftly. A dynamic system of Susceptible-Infected-Recovered (SIR) with Unaware-Aware (UA) process (SIR-UA) is newly developed by using compartment model through analytical approach with assumption of an infinite and well-mixed population. Moreover, individuals in a population can be classified into six states as unaware susceptible(SU), aware susceptible(SA), unaware infected(IU), aware infected(IA), unaware recovered(RU), and aware recovered(RA). Compared with previous models, the new dynamic set of equations described the more widespread situation and incorporated all possible states of Unaware-Aware (UA) with SIR process. The effect of awareness is explored carefully to show the significance on epidemic model with time steps. Consequently, the properties of parameters on the epidemic awareness model are studied to deliberate different physical situations. Finally, full phase diagrams are explored to show the epidemic sizes of susceptible and recovered individuals for various parameters.. |
| 325. | K. M.Ariful Kabir, Kazuki Kuga, Jun Tanimoto, Effect of information spreading to suppress the disease contagion on the epidemic vaccination game, Chaos, Solitons and Fractals, 10.1016/j.chaos.2018.12.023, 119, 180-187, 2019.02, [URL], The information awareness about contagious diseases have an influential effect on an individual's decision to suppress the diffusion of infections. In this work, a new mathematical framework for a vaccination game combined with susceptible-infected-recovered (SIR) and unaware-aware (UA) situation is considered. Altering wearing mask or taking protection against diseases, we consider the information spreading effect that might be represented the situation of self-protection. The information spreading is supposed only for local situation for a season, but has a very significant effect to reduce the infection through a generation. Within this concept, unaware and aware states are taken for susceptible, infected and vaccinated individuals for an infinite and well mixed population. Moreover, three different strategy updating rules concerning whether an individual committing or not vaccination: individual based, strategy based and direct selection are studied to show the comparison by depicting as full phase diagram. Finally, it can be seen that information spreading can subdue the spreading of epidemic within a population.. |
| 326. | K. M. Ariful Kabir, Kazuki Kuga, Jun Tanimoto, Analysis of SIR epidemic model with information spreading of awareness, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2018.12.017, 119, 118-125, 2019.02, The information spreading of awareness can prompt the manners of human to ease the infectious possibility and assist to recover swiftly. A dynamic system of Susceptible-Infected-Recovered (SIR) with Unaware-Aware (UA) process (SIR-UA) is newly developed by using compartment model through analytical approach with assumption of an infinite and well-mixed population. Moreover, individuals in a population can be classified into six states as unaware susceptible(S-U), aware susceptible(S-A), unaware infected(I-U), aware infected(I-A), unaware recovered(R-U), and aware recovered(R-A). Compared with previous models, the new dynamic set of equations described the more widespread situation and incorporated all possible states of Unaware-Aware (UA) with SIR process. The effect of awareness is explored carefully to show the significance on epidemic model with time steps. Consequently, the properties of parameters on the epidemic awareness model are studied to deliberate different physical situations. Finally, full phase diagrams are explored to show the epidemic sizes of susceptible and recovered individuals for various parameters. (C) 2018 Elsevier Ltd. All rights reserved.. |
| 327. | K. M. Ariful Kabir, Kazuki Kuga, Jun Tanimoto, Effect of information spreading to suppress the disease contagion on the epidemic vaccination game, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2018.12.023, 119, 180-187, 2019.02, The information awareness about contagious diseases have an influential effect on an individual's decision to suppress the diffusion of infections. In this work, a new mathematical framework for a vaccination game combined with susceptible-infected-recovered (SIR) and unaware-aware (UA) situation is considered. Altering wearing mask or taking protection against diseases, we consider the information spreading effect that might be represented the situation of self-protection. The information spreading is supposed only for local situation for a season, but has a very significant effect to reduce the infection through a generation. Within this concept, unaware and aware states are taken for susceptible, infected and vaccinated individuals for an infinite and well mixed population. Moreover, three different strategy updating rules concerning whether an individual committing or not vaccination: individual based, strategy based and direct selection are studied to show the comparison by depicting as full phase diagram. Finally, it can be seen that information spreading can subdue the spreading of epidemic within a population. (C) 2019 Elsevier Ltd. All rights reserved.. |
| 328. | K. M. Ariful Kabir, Jun Tanimoto, Zhen Wang, Influence of bolstering network reciprocity in the evolutionary spatial Prisoner’s Dilemma game a perspective, European Physical Journal B, 10.1140/epjb/e2018-90214-6, 91, 12, 2018.12, [URL], Abstract: Many recent studies on evolutionary spatial Prisoner’s Dilemma (SPD) games have provided insights into the mechanisms and frameworks that bolster the effect of network reciprocity. In this article, we provide a concise and comprehensive review of previous studies on evolutionary games and network reciprocity. Subsequently, we evaluate and compare the results from such studies in a unified manner to answer an open question in evolutionary SPD games: What are the factors underlying network reciprocity and what effect do these factors have on the emergence and promotion of cooperation? As a first step, we introduce a novel indicator to quantitatively evaluate the effectiveness (contribution) of a final fraction of cooperators via the introduction of the associated mechanisms into a simple evolutionary SPD game. In this game, the players are located on a two-dimensional square lattice with the Moore neighborhood and update their strategies by imitating the strategy of the best performing player among their neighbors, and the dynamics are separated into two periods: the enduring (END) period and the expanding (EXP) period. The initial fraction of cooperators is decreased transiently via the invasion and exploitation of defectors in the END period, and over the period, the fraction of cooperators is increased to expand cooperative clusters in the EXP period. Moreover, we also evaluate the statistical validity of our indicator by performing regression analyses. Our results indicate that two factors bolster the effect of network reciprocity: (1) the shape of the cooperative cluster (C-cluster) formed in the END period and (2) the ability to expand a single “perfect C-cluster,” which is the smallest patch, to increase the opportunity for interactions between cooperators and defectors and reduce exploitation by defectors in the EXP period.. |
| 329. | K. M. Ariful Kabir, Jun Tanimoto, Zhen Wang, Influence of bolstering network reciprocity in the evolutionary spatial Prisoner's Dilemma game: a perspective, EUROPEAN PHYSICAL JOURNAL B, 10.1140/epjb/e2018-90214-6, 91, 12, 2018.12, Many recent studies on evolutionary spatial Prisoner's Dilemma (SPD) games have provided insights into the mechanisms and frameworks that bolster the effect of network reciprocity. In this article, we provide a concise and comprehensive review of previous studies on evolutionary games and network reciprocity. Subsequently, we evaluate and compare the results from such studies in a unified manner to answer an open question in evolutionary SPD games: What are the factors underlying network reciprocity and what effect do these factors have on the emergence and promotion of cooperation? As a first step, we introduce a novel indicator to quantitatively evaluate the effectiveness (contribution) of a final fraction of cooperators via the introduction of the associated mechanisms into a simple evolutionary SPD game. In this game, the players are located on a two-dimensional square lattice with the Moore neighborhood and update their strategies by imitating the strategy of the best performing player among their neighbors, and the dynamics are separated into two periods: the enduring (END) period and the expanding (EXP) period. The initial fraction of cooperators is decreased transiently via the invasion and exploitation of defectors in the END period, and over the period, the fraction of cooperators is increased to expand cooperative clusters in the EXP period. Moreover, we also evaluate the statistical validity of our indicator by performing regression analyses. Our results indicate that two factors bolster the effect of network reciprocity: (1) the shape of the cooperative cluster (C-cluster) formed in the END period and (2) the ability to expand a single perfect C-cluster, which is the smallest patch, to increase the opportunity for interactions between cooperators and defectors and reduce exploitation by defectors in the EXP period.. |
| 330. | Kazuki Kuga, Jun Tanimoto, Impact of imperfect vaccination and defense against contagion on vaccination behavior in complex networks, Journal of Statistical Mechanics: Theory and Experiment, 10.1088/1742-5468/aae84f, 2018, 11, 2018.11, [URL], We explore a mathematical framework of the vaccination game taking into account spatial structure, say, and degree distribution amid individuals. The framework presumes SIR/V dynamics in a season, which is followed by a strategy update process that estimates whether an individual will take a protecting measure, considering imperfect vaccination or defense against contagion. The numerical result based on multi-agent simulations (MAS) validates our theory, suggesting that a more heterogeneous spatial structure is vulnerable to an epidemic. This conclusion is consistent with the qualitative knowledge that a pandemic arises more easily in a scale-free network than in homogeneous networks because of the negative contribution of hub agents acting as super spreaders. Highlights - A new theoretical model is established for the vaccination game with a SIR/V model and either imperfect vaccination or intermediate measures. - The model considers degree distribution amid individuals, which significantly influences disease spreading. - The model is validated by simulation results. - The results prove that a more heterogeneous network is disadvantageous to prevent disease spreading.. |
| 331. | T. Kawaminami, N. Ikegaya, A. Hagishima, J. Tanimoto, Velocity and scalar concentrations with low occurrence frequencies within urban canopy regions in a neutrally stable shear flow over simplified urban arrays, Journal of Wind Engineering and Industrial Aerodynamics, 10.1016/j.jweia.2018.09.024, 182, 286-294, 2018.11, [URL], The unsteadiness of urban airflow influences rare events of high wind speeds or high scalar concentrations. Therefore, this study uses large-eddy simulations to investigate the geometrical impact of generic block arrays on the statistical features of wind speeds and scalar concentrations within urban canopy regions. Six types of urban-like arrays with uniform and non-uniform block heights are considered, and probability density functions of wind speeds and scalar concentrations are derived based on the flow and concentration distributions within urban canopy regions. Exceeding wind speeds and scalar concentrations are determined through cumulative probability densities. The non-uniform spatial distribution of scalar concentrations is found to be correlated with the velocity magnitude distribution. In particular, airflows with strong wind speeds near tall blocks contribute to a reduction in the scalar concentration in that region. The probability density functions of velocity magnitude for arrays with height variations become long-tailed as the horizontally averaged wind speeds increase. Accordingly, the probability density at high scalar concentrations is lower for arrays with height variations. Finally, the exceeding wind speeds and scalar concentrations for arrays with height variation can be expressed as linear functions of the mean wind speed.. |
| 332. | Kazuki Kuga, Jun Tanimoto, Impact of imperfect vaccination and defense against contagion on vaccination behavior in complex networks, JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, 10.1088/1742-5468/aae84f, 2018, 11, 113402-113402, 2018.11, We explore a mathematical framework of the vaccination game taking into account spatial structure, say, and degree distribution amid individuals. The framework presumes SIR/V dynamics in a season, which is followed by a strategy update process that estimates whether an individual will take a protecting measure, considering imperfect vaccination or defense against contagion. The numerical result based on multi-agent simulations (MAS) validates our theory, suggesting that a more heterogeneous spatial structure is vulnerable to an epidemic. This conclusion is consistent with the qualitative knowledge that a pandemic arises more easily in a scale-free network than in homogeneous networks because of the negative contribution of hub agents acting as super spreaders.Highlights- A new theoretical model is established for the vaccination game with a SIR/V model and either imperfect vaccination or intermediate measures.- The model considers degree distribution amid individuals, which significantly influences disease spreading.- The model is validated by simulation results.- The results prove that a more heterogeneous network is disadvantageous to prevent disease spreading.. |
| 333. | Hiromu Ito, Jun Tanimoto, Scaling the phase-planes of social dilemma strengths shows game-class changes in the five rules governing the evolution of cooperation, Royal Society Open Science, 10.1098/rsos.181085, 5, 10, 2018.10, [URL], Game theory has been extensively applied to help explain how cooperative behaviour is promoted in human and animal societies. How do humans and animals establish reciprocity when confronting a social dilemma? In 2006, Nowak theoretically proved that numerous mechanisms and models for evolving cooperative behaviour reported over the last few decades can be distilled into five reciprocity mechanisms (rules). Additionally, universal scaling parameters were proposed to measure two different types of dilemmas, namely, the gamble-intending dilemma (GID) and risk-averting dilemma (RAD). In this work, by drawing a RAD-GID phase-plane diagram for pair-wise games, we prove that these five rules are indeed quite different for the resolution (relaxation) of the two dilemmas. These diagrams also demonstrate whether and when game-class change (resolution of a dilemma) occurs, thus implying how defectors can be eliminated.. |
| 334. | Hiromu Ito, Jun Tanimoto, Scaling the phase-planes of social dilemma strengths shows game-class changes n the five rules governing the evolution of cooperation, ROYAL SOCIETY OPEN SCIENCE, 10.1098/rsos.181085, 5, 10, 2018.10, Game theory has been extensively applied to help explain how cooperative behaviour is promoted in human and animal societies. How do humans and animals establish reciprocity when confronting a social dilemma? In 2006, Nowak theoretically proved that numerous mechanisms and models for evolving cooperative behaviour reported over the last few decades can be distilled into five reciprocity mechanisms (rules). Additionally, universal scaling parameters were proposed to measure two different types of dilemmas, namely, the gamble-intending dilemma (GID) and risk-averting dilemma (RAD). In this work, by drawing a RAD-GID phase-plane diagram for pair-wise games, we prove that these five rules are indeed quite different for the resolution (relaxation) of the two dilemmas. These diagrams also demonstrate whether and when game-class change (resolution of a dilemma) occurs, thus implying how defectors can be eliminated.. |
| 335. | Muntasir Alam, Keisuke Nagashima, Jun Tanimoto, Various error settings bring different noise-driven effects on network reciprocity in spatial prisoner's dilemma, Chaos, solitons and fractals, 10.1016/j.chaos.2018.07.014, 114, 338-346, 2018.09, [URL], In view of stochastic resonance effect, this paper reports what type of additional noise can draw more enhanced network reciprocity in spatial prisoner's dilemma (SPD) games presuming different underlying networks as well as strategy updating rules. Relying on a series of simulations comprehensively designed, we explored various noise models namely action error, copy error, observation error, by either placing random agents or biased agents and variant settings of those. We found that the influence by adding noise significantly differs depending on the type of noise as well as the combination of what underlying network and update rule are presumed. Action error when added to SPD games presuming deterministic updating rule shows relatively large enhancement for cooperation.. |
| 336. | Yuki Murakami, Naoki Ikegaya, Aya Hagishima, Jun Tanimoto, Coupled simulations of indoor-outdoor flow fields for cross-ventilation of a building in a simplified urban array, Atmosphere, 10.3390/atmos9060217, 9, 6, 2018.06, [URL], Computational fluid dynamics simulations with a Reynolds-averaged Navier-Stokes model were performed for flow fields over a building array and inside a building in the array with different building opening positions. Ten combinations of opening locations were selected to investigate the effect of the locations on indoor cross-ventilation rates. The results of these simulations show that the exterior distributions of mean wind speed and turbulence kinetic energy hardly differ even though building openings exist. Although similar patterns of outdoor flow fields were observed, the opening positions produced two different types of ventilations: one-way and two-way. In one-way ventilation, the wind flows through the opening are unidirectional: diagonally downward at the windward wall. In two-way ventilation, both inflow and outflow simultaneously occur through the same opening. Determination of ventilation rates showed that the ventilation types can explain what type of ventilation rate may be significant for each opening location.. |
| 337. | Ryo Matsuzawa, Jun Tanimoto, Sanctions triggered by jealousy help promote the cooperation in spatial prisoner's dilemma games, Chaos, solitons and fractals, 10.1016/j.chaos.2018.03.029, 110, 239-243, 2018.05, [URL], Human beings have a natural tendency to feel jealous of those who have more than themselves. A previous report found that harmful behavior stemming from jealousy can actually encourage cooperation. The present study considers the efficiency of jealousy-motivated sanctions and the appropriate balance of sanctions and enforcement costs to best encourage cooperation. Through a series of numerical simulations of a spatial prisoner's dilemma game, we find that in the case of a lattice population structure, stronger sanctions and higher sanction efficiency ultimately result in more robust cooperation. In contrast, in the case of a scale-free population structure, higher sanction costs cause the cooperation level to rise.. |
| 338. | Ryo Matsuzawa, Jun Tanimoto, Sanctions triggered by jealousy help promote the cooperation in spatial prisoner's dilemma games, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2018.03.029, 110, 239-243, 2018.05, Human beings have a natural tendency to feel jealous of those who have more than themselves. A previous report found that harmful behavior stemming from jealousy can actually encourage cooperation. The present study considers the efficiency of jealousy-motivated sanctions and the appropriate balance of sanctions and enforcement costs to best encourage cooperation. Through a series of numerical simulations of a spatial prisoner's dilemma game, we find that in the case of a lattice population structure, stronger sanctions and higher sanction efficiency ultimately result in more robust cooperation. In contrast, in the case of a scale-free population structure, higher sanction costs cause the cooperation level to rise. (C) 2018 Elsevier Ltd. All rights reserved.. |
| 339. | Yoshiro Iwamura, Jun Tanimoto, Realistic decision-making processes in a vaccination game, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2017.11.148, 494, 236-241, 2018.03, [URL], Previous studies of vaccination games have nearly always assumed a pairwise comparison between a focal and neighboring player for the strategy updating rule, which comes from numerous compiled studies on spatial versions of 2-player and 2-strategy (2 × 2) games such as the spatial prisoner's dilemma (SPD). We propose, in this study, new update rules because the human decision-making process of whether to commit to a vaccination is obviously influenced by a “sense of crisis” or “fear” urging him/her toward vaccination, otherwise they will likely be infected. The rule assumes that an agent evaluates whether getting a vaccination or trying to free ride should be attempted based on observations of whether neighboring non-vaccinators were able to successfully free ride during the previous time-step. Compared to the conventional updating rule (standard pairwise comparison assuming a Fermi function), the new rules generally realize higher vaccination coverage and smaller final epidemic sizes. One rule in particular shows very good performance with significantly smaller epidemic sizes despite comparable levels of vaccination coverage. This is because the specific update rule helps vaccinators spread widely in the domain, which effectively hampers the spread of epidemics.. |
| 340. | Nurizzatul Atikha Rahmat, Aya Hagishima, Naoki Ikegaya, Jun Tanimoto, Experimental study on effect of spires on the lateral nonuniformity of mean flow in a wind tunnel, Evergreen, 10.5109/1929670, 5, 1, 1-15, 2018.03, [URL], The present work discusses in detail the experimental settings to establish a thick artificially generated urban-like atmospheric boundary layer in a short-fetch-length wind tunnel. It summarizes the comprehensive review of past studies on the flow behind quarter-elliptic-wedge spires, and clarifies the current issue of the spire setting in a wind tunnel experiment. This study investigates the persistent spanwise heterogeneity, the spatial structures of the flow past a row of quarter-elliptic-wedge spires, the streamwise distance required for a wake of elliptic-wedge spires to naturally recover, and how the mean flow changes farther downstream. Two experimental conditions were implemented in the present work (without and with spires) to analyse the effect of mean flow heterogeneity both within and above boundary layer height (BLH) regions, developing over a smooth wall that was produced by the installation of a flat plate on the wind tunnel floor.. |
| 341. | Yoshiro Iwamura, Jun Tanimoto, Complex traffic flow that allows as well as hampers lane-changing intrinsically contains social-dilemma structures, Journal of Statistical Mechanics: Theory and Experiment, 10.1088/1742-5468/aaa8ff, 2018, 2, 2018.02, [URL], To investigate an interesting question as to whether or not social dilemma structures can be found in a realistic traffic flow reproduced by a model, we built a new microscopic model in which an intentional driver may try lane-changing to go in front of other vehicles and may hamper others' lane-changes. Our model consists of twofold parts; cellular automaton emulating a real traffic flow and evolutionary game theory to implement a driver's decision making-process. Numerical results reveal that a social dilemma like the multi-player chicken game or prisoner's dilemma game emerges depending on the traffic phase. This finding implies that a social dilemma, which has been investigated by applied mathematics so far, hides behind a traffic flow, which has been explored by fluid dynamics. Highlight - Complex system of traffic flow with consideration of driver's decision making process is concerned. - A new model dovetailing cellular automaton with game theory is established. - Statistical result from numerical simulations reveals a social dilemma structure underlying traffic flow. - The social dilemma is triggered by a driver's egocentric actions of lane-changing and hampering other's lane-change.. |
| 342. | Kazuki Kuga, Jun Tanimoto, Which is more effective for suppressing an infectious disease Imperfect vaccination or defense against contagion?, Journal of Statistical Mechanics: Theory and Experiment, 10.1088/1742-5468/aaac3c, 2018, 2, 2018.02, [URL], We consider two imperfect ways to protect against an infectious disease such as influenza, namely vaccination giving only partial immunity and a defense against contagion such as wearing a mask. We build up a new analytic framework considering those two cases instead of perfect vaccination, conventionally assumed as a premise, with the assumption of an infinite and well-mixed population. Our framework also considers three different strategy-updating rules based on evolutionary game theory: conventional pairwise comparison with one randomly selected agent, another concept of pairwise comparison referring to a social average, and direct alternative selection not depending on the usual copying concept. We successfully obtain a phase diagram in which vaccination coverage at equilibrium can be compared when assuming the model of either imperfect vaccination or a defense against contagion. The obtained phase diagram reveals that a defense against contagion is marginally inferior to an imperfect vaccination as long as the same coefficient value is used. Highlights - We build a new analytical framework for a vaccination game combined with the susceptible-infected-recovered (SIR) model. - Our model can evaluate imperfect provisions such as vaccination giving only partial immunity and a defense against contagion. - We obtain a phase diagram with which to compare the quantitative effects of partial vaccination and a defense against contagion.. |
| 343. | Yuki Ida, Jun Tanimoto, Effect of noise-perturbing intermediate defense measures in voluntary vaccination games, Chaos, Solitons and Fractals, 10.1016/j.chaos.2017.11.031, 106, 337-341, 2018.01, [URL], Recently, a new vaccination game model was proposed, where an intermediate defense measure besides two fundamental strategies; committing vaccination that leads to a perfect immunity and not committing vaccination, was introduced as third strategy. We explore what happens if both effectiveness and cost of an intermediate defense measure stochastically perturbing on the viewpoint of whether or not the third strategy helping to improve total social payoff. We found that unlike resonance effect by adding noise to payoff matrix in case of spatial prisoner's dilemma (SPD) games, adding time-varying noise on both effectiveness and cost does not make difference from the default setting without perturbation to the third strategy. However, if the noise initially given to each agent is frozen, we found the third strategy becoming robust to survive. In particular, if the strategy updating rule allows a more advantageous third strategy can be more commonly shared among agents through copying, the total social payoff is significantly improved.. |
| 344. | Naoki Ikegaya, Y. Ikeda, Aya Hagishima, Jun Tanimoto, Evaluation of rare velocity at a pedestrian level due to turbulence in a neutrally stable shear flow over simplified urban arrays, Journal of Industrial Aerodynamics, 10.1016/j.jweia.2017.10.002, 171, 137-147, 2017.12, [URL], The geometric dependency of the wind environment at a pedestrian level is an important issue that influences human comfort and safety in urban outdoor spaces. As such, this paper proposes to investigate the statistical features of wind speeds at the pedestrian level by calculating wind speed probability density functions based on flow field data from large-eddy simulations of simplified urban arrays, aiming to clarify the effects of urban geometry on rare velocity events such as strong gusts or extremely weak air flow. Though strong wind events occur infrequently, a positive correlation was demonstrated between percentile and mean wind speeds, indicating that the risk of gusty events increases with the increase of mean wind speeds. Conversely, the frequency of weak wind events shows an inverse correlation with mean wind speeds, showing that better ventilated urban arrays will retain higher wind speeds. Furthermore, these percentiles and occurrence frequencies are clearly expressed by the frontal area indices of urban block arrays. These results imply a trade-off between the following two objectives for urban area wind environments characterized by the urban geometry: enhancing air ventilation in urban areas and preventing strong wind gust events at a pedestrian level.. |
| 345. | Ryo Matsuzawa, Jun Tanimoto, Eriko Fukuda, Properties of a new small-world network with spatially biased random shortcuts, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2017.05.031, 486, 408-415, 2017.11, [URL], This paper introduces a small-world (SW) network with a power-law distance distribution that differs from conventional models in that it uses completely random shortcuts. By incorporating spatial constraints, we analyze the divergence of the proposed model from conventional models in terms of fundamental network properties such as clustering coefficient, average path length, and degree distribution. We find that when the spatial constraint more strongly prohibits a long shortcut, the clustering coefficient is improved and the average path length increases. We also analyze the spatial prisoner's dilemma (SPD) games played on our new SW network in order to understand its dynamical characteristics. Depending on the basis graph, i.e., whether it is a one-dimensional ring or a two-dimensional lattice, and the parameter controlling the prohibition of long-distance shortcuts, the emergent results can vastly differ.. |
| 346. | Jun Tanimoto, Does information of how good or bad your neighbors are enhance cooperation in spatial Prisoner's games?, Chaos, Solitons and Fractals, 10.1016/j.chaos.2017.05.038, 103, 184-193, 2017.10, [URL], Network reciprocity is one of the key mechanisms to solve social dilemmas, and has attracted many researchers for the last decade. Here, we explore what happens if network reciprocity is dovetailed with indirect reciprocity. This is motivated by the idea that a player may utilize observed information to evaluate his neighbors. Simulations based on our minimal model reveal that adding indirect reciprocity does not always increase the level of cooperation beyond the level of model without indirect reciprocity. This implies that the combination of two different reciprocity mechanisms, each enhancing cooperation if applied independently, can lead negative interference effect on cooperation. The details of this depend on type of action assessment system determining what is good and bad. Interestingly, we found that a high level of information is not always superior to low levels of information.. |
| 347. | Fukuda E, 谷本潤, Iwamura Y, Nakamura K, Akimoto M, Field measurement analysis to validate lane-changing behavior in a cellular automaton model, Physical Review E, http://link.aps.org/doi/10.1103/PhysRevE.94.052209, 94, 052209-052209, 2017.08. |
| 348. | Jun Tanimoto, Coevolution of discrete, mixed, and continuous strategy systems boosts in the spatial prisoner's dilemma and chicken games, Applied Mathematics and Computation, 10.1016/j.amc.2017.01.015, 304, 20-27, 2017.07, [URL], A coevolutionary model by which both the strategy system and strategy value itself are allowed to adapt is established in the framework of spatial 2 × 2 games. Agents decide to update their behaviors in accordance with a discrete strategy (with a binary strategy set comprising only either cooperation (C) or defection (D)), mixed strategy, or continuous strategy. Because of the evolutionary advantage of the mixed strategy, which allows relatively high cooperators to offer defection to their defective neighbors to avoid exploitation by them, we found that the mixed strategy diffuses to the entire society in most of the dilemma region, and uses robust cooperation to increase the agents’ typical payoffs.. |
| 349. | Jun Tanimoto, Coevolution of discrete, mixed, and continuous strategy systems boosts in the spatial prisoner's dilemma and chicken games, APPLIED MATHEMATICS AND COMPUTATION, 10.1016/j.amc.2017.01.015, 304, 20-27, 2017.07, A coevolutionary model by which both the strategy system and strategy value itself are allowed to adapt is established in the framework of spatial 2 x 2 games. Agents decide to update their behaviors in accordance with a discrete strategy (with a binary strategy set comprising only either cooperation (C) or defection (D)), mixed strategy, or continuous strategy. Because of the evolutionary advantage of the mixed strategy, which allows relatively high cooperators to offer defection to their defective neighbors to avoid exploitation by them, we found that the mixed strategy diffuses to the entire society in most of the dilemma region, and uses robust cooperation to increase the agents' typical payoffs. (C) 2017 Elsevier Inc. All rights reserved.. |
| 350. | Tsuyoshi Sato, Aya Hagishima, Naoki Ikegaya, Jun Tanimoto, A study on accuracy of particle image velocimetry in a wind tunnel simulating airflow around building scale model, AIJ Journal of Technology and Design, 10.3130/aijt.23.567, 23, 54, 567-572, 2017.06, [URL], PIV is an attractive experimental method for investigating turbulent flow around building model in a wind tunnel. However, it is difficult to obtain data with high accuracy in large size wind tunnel. In this paper, first we give an overview of PIV technique and organize the experimental conditions of past PIV in urban climatology. Then, we consider a technological problem which is called peak locking. We explain the mechanism of the generation of peak locking and how it affects the final output. Avoiding peak locking is difficult in general experimental condition, but it is mitigated by a simple image processing.. |
| 351. | Jun Tanimoto, How does resolution of strategy affect network reciprocity in spatial prisoner's dilemma games?, Applied Mathematics and Computation, 10.1016/j.amc.2016.11.036, 301, 36-42, 2017.05, [URL], In the canonical framework of evolutionary 2ï¿½× 2 games, a binary strategy set comprising cooperation (C) and defection (D) has usually been presumed. Inspired by commonly observed real-world facts, we explore what happens if the resolution of strategy increases. As an extreme limit, the infinite resolution case is both a continuous and a mixed strategy defined by a real number in the range of [0,1]. We find that increasing resolution amplifies cooperation in spatial prisoner's dilemma games as compared with the binary strategy definition; however, this enhancement tendency with increasing resolution is not monotonic in the case of a mixed-strategy setting.. |
| 352. | Jun Tanimoto, How does resolution of strategy affect network reciprocity in spatial prisoner's dilemma games?, APPLIED MATHEMATICS AND COMPUTATION, 10.1016/j.amc.2016.11.036, 301, 36-42, 2017.05, In the canonical framework of evolutionary 2 x 2 games, a binary strategy set comprising cooperation (C) and defection (D) has usually been presumed. Inspired by commonly observed real-world facts, we explore what happens if the resolution of strategy increases. As an extreme limit, the infinite resolution case is both a continuous and a mixed strategy defined by a real number in the range of [0,1]. We find that increasing resolution amplifies cooperation in spatial prisoner's dilemma games as compared with the binary strategy definition; however, this enhancement tendency with increasing resolution is not monotonic in the case of a mixed-strategy setting. (C) 2016 Elsevier Inc. All rights reserved.. |
| 353. | 小野哲嗣, 萩島 理, 谷本潤, 池谷 直樹, 大規模集合住宅のエアコンの電力量の時系列データに基づく統計分析, 空気調和衛生後学会論文集, 239, 1-10, 2017.02. |
| 354. | Naoki Ikegaya, Y. Ikeda, Aya Hagishima, A. A. Razak, Jun Tanimoto, A prediction model for wind speed ratios at pedestrian level with simplified urban canopies, Theorectical and Applied Climatology, 10.1007/s00704-015-1655-z, 127, 3-4, 655-665, 2017.02, [URL], The purpose of this study is to review and improve prediction models for wind speed ratios at pedestrian level with simplified urban canopies. We adopted an extensive database of velocity fields under various conditions for arrays consisting of cubes, slender or flattened rectangles, and rectangles with varying roughness heights. Conclusions are summarized as follows: first, a new geometric parameter is introduced as a function of the plan area index and the aspect ratio so as to express the increase in virtual density that causes wind speed reduction. Second, the estimated wind speed ratios in the range 0.05 |
| 355. | 谷本潤, Coevolution of discrete, mixed, and continuous strategy systems boosts in the spatial prisoner's dilemma and chicken games, Applied Mathematics and Computation, http://dx.doi.org/10.1016/j.amc.2017.01.016, 304, 1, 20-27, 2017.01. |
| 356. | Naoki Ikegaya, Chiyoko Hirose, Aya Hagishima, Jun Tanimoto, Effect of turbulent flows generated by simplified roughness blocks on instantaneous wall pressure based on large-eddy simulation, Journal of Wind Engineering, 10.5359/jwe.42.22, 42, 1, 22-35, 2017.01, [URL], We have performed Large-Eddy Simulation of flow and pressure fields over two types of urban-like block arrays in order to investigate the relationships between instantaneous building wall pressure and surrounding flow fields. The adopted block arrays are: lattice-type square and staggered pattern. The analysis on the distributions of statistics for wall pressure shows that the large values of the statistics are observed along with the top and side edges of the wall for the square array, whereas they are shown on an upper half region of the wall for the staggered array. These large values are due to air flow introduction from both above and side of the target block for square array; in contrast, strong flows introduced into canopy area cause large pressures of the upper half of the wall for staggered array.. |
| 357. | Naoki Ikegaya, Yasuaki Ikeda, Aya Hagishima, Jun Tanimoto, Statistical analysis of wind speeds at a pedestrian level of urban-like roughness, Journal of Wind Engineering, 10.5359/jwe.42.1, 42, 1, 1-8, 2017.01, [URL], We have performed Large-Eddy Simulation of turbulent boundary layer over simplified urban like roughness. Totally six types of arrays are adopted with several roughness densities and roughness aspect ratios. The turbulent flow fields at a pedestrian level are investigated to identify probability characteristics of unsteady flows. Conclusions are summarized as follows. First, the probability density functions of wind speeds at a pedestrian level show long-tail shape with positive skewness for all arrays and well explained by dimensionless probability variable defined by the mean and standard deviation of wind speeds. On the other hands, the discrepancies of the probability between arrays become considerable for events with wind speeds larger than triple of the standard deviations. Second, such events with large wind speed rarely happen; the cumulative probability shows approximately 1%. Lastly, linear relationships are confirmed between the mean and percentile wind speeds. These findings will help the understanding of the unsteadiness nature of turbulent flow in urban boundary layer especially when evaluating very rare events such as gusts or extreme low winds.. |
| 358. | 松澤遼, 谷本潤, 福田枝里子, 萩島 理, 池谷 直樹, 嫉妬による制裁の効率性が協調進化に与える影響, 第22回交通流のシミュレーションシンポジウム, 45-48, 2016.12. |
| 359. | 岩村泰郎, 谷本潤, 福田枝里子, 萩島 理, 池谷 直樹, 自主的ワクチン接種行動に関する現実的な意志決定方法の提案, 第22回交通流のシミュレーションシンポジウム, 49-52, 2016.12. |
| 360. | 谷本潤, How does resolution of strategy affect network reciprocity in spatial prisoner’s dilemma games?, Applied Mathematics and Computation, http://dx.doi.org/10.1016/j.amc.2016.11.036, 301, 15, 36-42, 2016.11. |
| 361. | Ryo Matsuzawa, Jun Tanimoto, A social dilemma structure in diffusible public goods, Europhysics Letters, 10.1209/0295-5075/116/38005, 116, 3, 2016.11, [URL], Encouraged by the interaction between two species of microbes, in which one species is capable of replenishing the public resources and the other is not, the dilemma structure (the long-term sustainability of the population) hidden in a system where public goods are defined as diffusible was examined. In a series of simulations in which the three major parameters governing the dynamics of the system were varied, following the effect of the spatial structure that results from resource diffusion and distribution, the dynamics show a rich diversity, including cooperator-dominated, extinct, and coexistent results. If the dilemma is strong, the chance of surviving cooperators is small and the population tends to extinction even though coexistence is possible. By contrast, if a weak dilemma is given, the affluent resources make cooperators dominant over defectors.. |
| 362. | Jun Tanimoto, Enhancement of cooperation in the spatial prisoner's dilemma with a coherence-resonance effect through annealed randomness at a cooperator–defector boundary; comparison of two variant models, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2016.06.002, 462, 714-724, 2016.11, [URL], Inspired by the commonly observed real-world fact that people tend to behave in a somewhat random manner after facing interim equilibrium to break a stalemate situation whilst seeking a higher output, we established two models of the spatial prisoner's dilemma. One presumes that an agent commits action errors, while the other assumes that an agent refers to a payoff matrix with an added random noise instead of an original payoff matrix. A numerical simulation revealed that mechanisms based on the annealing of randomness due to either the action error or the payoff noise could significantly enhance the cooperation fraction. In this study, we explain the detailed enhancement mechanism behind the two models by referring to the concepts that we previously presented with respect to evolutionary dynamic processes under the names of enduring and expanding periods.. |
| 363. | Eriko Fukuda, Jun Tanimoto, Yoshiro Iwamura, Kosuke Nakamura, Akimoto Mitsuhiro, Field measurement analysis to validate lane-changing behavior in a cellular automaton model, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.94.052209, 94, 5, 2016.11, [URL], In the present study, we analyzed field measurement data obtained for a Japanese expressway and used it as a data set for the validation of microscopic simulation models. Consequently, in accordance with previous studies, we confirmed the common features depicted by the fundamental diagram (flux vs density relation) and lane-usage ratio vs density diagram. We found two things regarding lane-changing behavior: (1) a lane change occurs asymmetrically, where a lane change from a slow to a fast lane differs from that from a fast to a slow lane; and (2) the so-called incentive criterion in the case of small gaps between the preceding vehicles in both slow and fast lanes refers to the velocities and /or the relative velocities with respect to the preceding vehicles, whereas that for relatively large gaps refers to the distances to the preceding vehicles is cast into the above incentive criterion in addition to the two factors mentioned above.. |
| 364. | Ryo Matsuzawa, Jun Tanimoto, A social dilemma structure in diffusible public goods, EPL, 10.1209/0295-5075/116/38005, 116, 3, 2016.11, Encouraged by the interaction between two species of microbes, in which one species is capable of replenishing the public resources and the other is not, the dilemma structure (the long-term sustainability of the population) hidden in a system where public goods are defined as diffusible was examined. In a series of simulations in which the three major parameters governing the dynamics of the system were varied, following the effect of the spatial structure that results from resource diffusion and distribution, the dynamics show a rich diversity, including cooperator-dominated, extinct, and coexistent results. If the dilemma is strong, the chance of surviving cooperators is small and the population tends to extinction even though coexistence is possible. By contrast, if a weak dilemma is given, the affluent resources make cooperators dominant over defectors. Copyright (C) EPLA, 2016. |
| 365. | Jun Tanimoto, Enhancement of cooperation in the spatial prisoner's dilemma with a coherence-resonance effect through annealed randomness at a cooperator-defector boundary; comparison of two variant models, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2016.06.002, 462, 714-724, 2016.11, Inspired by the commonly observed real-world fact that people tend to behave in a somewhat random manner after facing interim equilibrium to break a stalemate situation whilst seeking a higher output, we established two models of the spatial prisoner's dilemma. One presumes that an agent commits action errors, while the other assumes that an agent refers to a payoff matrix with an added random noise instead of an original payoff matrix. A numerical simulation revealed that mechanisms based on the annealing of randomness due to either the action error or the payoff noise could significantly enhance the cooperation fraction. In this study, we explain the detailed enhancement mechanism behind the two models by referring to the concepts that we previously presented with respect to evolutionary dynamic processes under the names of enduring and expanding periods. (C) 2016 Elsevier B.V. All rights reserved.. |
| 366. | Eriko Fukuda, Jun Tanimoto, Yoshiro Iwamura, Kosuke Nakamura, Mitsuhiro Akimoto, Field measurement analysis to validate lane-changing behavior in a cellular automaton model, PHYSICAL REVIEW E, 10.1103/PhysRevE.94.052209, 94, 5, 2016.11, In the present study, we analyzed field measurement data obtained for a Japanese expressway and used it as a data set for the validation of microscopic simulation models. Consequently, in accordance with previous studies, we confirmed the common features depicted by the fundamental diagram (flux vs density relation) and lane-usage ratio vs density diagram. We found two things regarding lane-changing behavior: (1) a lane change occurs asymmetrically, where a lane change from a slow to a fast lane differs from that from a fast to a slow lane; and (2) the so-called incentive criterion in the case of small gaps between the preceding vehicles in both slow and fast lanes refers to the velocities and /or the relative velocities with respect to the preceding vehicles, whereas that for relatively large gaps refers to the distances to the preceding vehicles is cast into the above incentive criterion in addition to the two factors mentioned above.. |
| 367. | Matsuzawa R, 谷本潤, A social dilemma structure in diffusible public goods, EPL, http://dx.doi.org/10.1209/0295-5075/116/38005, 116, 38005-38005, 2016.10. |
| 368. | Jun Tanimoto, A multi-community homogeneous small-world network and its fundamental characteristics, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2016.04.044, 460, 88-97, 2016.10, [URL], We introduce a new small-world network-which we call the multi-community homogeneous-small-world network-that is divided into multiple communities that are relatively isolated, similar to sparsely connected islands. A generating algorithm is presented and its network parameters are explored. To elucidate the fundamental characteristics of the proposed topology, we adopt spatial prisoner's dilemma games as a template for discussion. Comparing with a conventional homogeneous small-world network, more enhanced network reciprocity is observed in games where a stag hunt-type dilemma is large. With intensive analysis, we find how this enhancement is brought about.. |
| 369. | Jun Tanimoto, Kousuke Nakamura, Social dilemma structure hidden behind traffic flow with route selection, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2016.04.023, 459, 92-99, 2016.10, [URL], Several traffic flows contain social dilemma structures. Herein, we explored a route-selection problem using a cellular automaton simulation dovetailed with evolutionary game theory. In our model, two classes of driver-agents coexist: D agents (defective strategy), which refer to traffic information for route selection to move fast, and C agents (cooperative strategy), which are insensitive to information and less inclined to move fast. Although no evidence suggests that the social dilemma structure in low density causes vehicles to move freely and that in high density causes traffic jams, we found a structure that corresponds to an n-person (multiplayer) Chicken (n-Chicken) game if the provided traffic information is inappropriate. If appropriate traffic information is given to the agents, the n-Chicken game can be solved. The information delivered to vehicles is crucial for easing the social dilemma due to urban traffic congestion when developing technologies to support the intelligent transportation system (ITS).. |
| 370. | 谷本潤, A multi-community homogeneous small-world network and its fundamental characteristics, Physica A, 2016.09. |
| 371. | Iwamura R, 谷本潤, Fukuda E, Effect of intermediate defense measures in voluntary vaccination games, Journal of Statistical Mechanics: Theory and Experiment, http://dx.doi.org/10.1088/1742-5468/2016/09/093501, 093501-093501, 2016.09. |
| 372. | Yoshiro Iwamura, Jun Tanimoto, Eriko Fukuda, Effect of intermediate defense measures in voluntary vaccination games, Journal of Statistical Mechanics: Theory and Experiment, 10.1088/1742-5468/2016/09/093501, 2016, 9, 2016.09, [URL], We build a model to reproduce the decision-making process of getting a vaccination based on the evolutionary game theory dovetailed with the SIR model for epidemic spreading. Unlike the two extreme options of whether or not getting a vaccination leads to perfect immunity, we consider whether 'intermediate defense measures' including masking, gargling, and hand-washing lead to imperfect effects of preventing infection. We consider introducing not only a 'third strategy' as a discrete intermediate measure but also a continuous strategy space connecting the cases of getting and not getting a vaccination. Interestingly, our evolutionary analysis suggests that the introduction of intermediate measures makes no difference for the case of a 2-strategy system in which only either getting or not getting a vaccination is allowed, even does not ameliorate, or say, gets worse to prevent spreading a disease. This seems quite different from what was observed in 2-player and 2-strategy (2 × 2) prisoner's dilemma (PD) games with relatively stronger chicken-type dilemma than the stag-hunt one in which the introduction of middle-course strategies significantly enhances cooperation.. |
| 373. | Yoshiro Iwamura, Jun Tanimoto, Eriko Fukuda, Effect of intermediate defense measures in voluntary vaccination games, JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, 10.1088/1742-5468/2016/09/093501, 2016, 9, 2016.09, We build a model to reproduce the decision-making process of getting a vaccination based on the evolutionary game theory dovetailed with the SIR model for epidemic spreading. Unlike the two extreme options of whether or not getting a vaccination leads to perfect immunity, we consider whether 'intermediate defense measures' including masking, gargling, and hand-washing lead to imperfect effects of preventing infection. We consider introducing not only a 'third strategy' as a discrete intermediate measure but also a continuous strategy space connecting the cases of getting and not getting a vaccination. Interestingly, our evolutionary analysis suggests that the introduction of intermediate measures makes no difference for the case of a 2-strategy system in which only either getting or not getting a vaccination is allowed, even does not ameliorate, or say, gets worse to prevent spreading a disease. This seems quite different from what was observed in 2-player and 2-strategy (2 x 2) prisoner's dilemma (PD) games with relatively stronger chicken-type dilemma than the stag-hunt one in which the introduction of middle-course strategies significantly enhances cooperation.. |
| 374. | 谷本潤, Nakamura,K., Social dilemma structure hidden behind traffic flow with route selection, Physica A, http://dx.doi.org/10.1016/j.physa.2016.04.023, 459, 92-99, 2016.08. |
| 375. | Ryo Matsuzawa, Jun Tanimoto, Eriko Fukuda, Spatial prisoner's dilemma games with zealous cooperators, Physical Review E, 10.1103/PhysRevE.94.022114, 94, 2, 2016.08, [URL], The existence of a zealot who stays a cooperator irrespective of the result of an interaction has been reported to add "social viscosity" to a population and thereby helps increase the cooperation level in prisoner's dilemma games, which premises the so-called well-mixed situation of a population. We found that this is not always true when a spatial structure, i.e., connecting agent, is introduced. Deploying zealots is counterproductive, especially when the underlying topology is homogenous, similar to that of a lattice. Our simulation reveals how the existence of never-converting cooperators destroys rather than boosts cooperation. We explain detailed mechanisms behind this interesting finding by referring to our previously presented concepts with respect to evolutionary dynamic processes for spatial games under the names enduring and expanding periods.. |
| 376. | Matsuzawa Ryou, 谷本潤, Fukuda Eriko, Spatial prisoner's dilemma games with zealous cooperators, Physical Review E, http://dx.doi.org/10.1103/PhysRevE.94.022114, 94, 022114-022114, 2016.06. |
| 377. | 谷本潤, A Enhancement of cooperation in the spatial prisoner's dilemma with a coherence-resonance effect through annealed randomness at a cooperator-defector boundary; comparison of two variant models, Physica A, http://dx.doi.org/10.1016/j.physa.2016.06.002, 462, 714-724, 2016.05. |
| 378. | Naoki Ikegaya, C. Hirose, Aya Hagishima, Jun Tanimoto, Effect of turbulent flow on wall pressure coefficients of block arrays within urban boundary layer, Building and Environment, 10.1016/j.buildenv.2016.02.005, 100, 28-39, 2016.05, [URL], Various numerical simulations have been developed to evaluate the mean ventilation rates of a target building; however, the manner in which turbulent flow generated by buildings and surrounding conditions affects the mean and fluctuating ventilation rates is not well understood. Therefore, we have performed large-eddy simulation of flow and pressure fields above two types of block arrays (lattice-type square and staggered pattern) to clarify the turbulent characteristics of estimated ventilation rates based on pressure coefficient distribution on the block faces. The concept of short-term ventilation rates, which are estimated from filtered pressure coefficients, is introduced to investigate the temporal variation in the estimated ventilation rates for different locations of the block faces and arrangements. First, mean and second-order turbulent statistics agree well with previous results obtained from both wind-tunnel experiments and numerical simulations, indicating that the turbulent characteristics of the flow above urban-like arrays are well reproduced. Second, short-term ventilation rates are found to vary temporally and spatially. Therefore, these values instantaneously become larger or smaller than the mean ventilation rates. In addition, complex fluctuation patterns of pressure coefficient distribution are found to be caused by air flow introduction from the block arrays into gaps between the blocks as well as by small-scale turbulence generated by surrounding buildings themselves. Lastly, the temporal statistics of filtered pressure coefficients show that the short-term ventilation rates can possibly become stronger or weaker than the mean ventilation rates, whereas the accumulated fluctuating ventilation rates are almost comparable to those estimated by mean pressure coefficients.. |
| 379. | Tsuyoshi Sato, Aya Hagishima, Naoki Ikegaya, Jun Tanimoto, Wind tunnel experiment on turbulent flow field around 2D street canyon with eaves, Journal of Environmental Engineering (Japan), 10.3130/aije.81.467, 81, 723, 467-476, 2016.05, [URL], In this study, the influence of the complexity of shape of roughness on turbulent flow fields in a 2D street canyon was investigated using a wind tunnel experiment (WTE). Time-resolved particle image velocimetry (TR-PIV) was employed to investigate temporally averaged flow fields, the spatial distributions of turbulent statistics, canyon ventilation rates, and the flow exchange mechanism between the regions above and inside a canyon. The measurements revealed that the temporally averaged flow fields and the spatial distributions of turbulent statistics are drastically changed by the complexity of roughness, especially when the canyon aspect ratio is small. Moreover, the ventilation rate is reduced by the eaves attached to roofs. However, the decreasing rate of the ventilation strongly depends on the canyon aspect ratio.. |
| 380. | 谷本潤, 萩島 理, 池谷 直樹, Hirose,C., Effect of turbulent flow on wall pressure coefficients of block arrays within urban boundary layer, Building and Environment, 100, 28-39, 2016.03. |
| 381. | Jun Tanimoto, Hiromichi Fujino, Akihiro Hisaka, Hiroki Takahashi, Toshihiko Murayama, Mapping analysis of mutated cDNA sequences in human DP and EP2 prostanoid receptors, JOURNAL OF PHARMACOLOGICAL SCIENCES, 130, 3, S214-S214, 2016.03. |
| 382. | 谷本潤, Fukuda, E., Effects of stubborn decision-makers on vaccination and disease propagation in social networks, International Journal of Automation and Logistics, 2, 78-92, 2016.01. |
| 383. | 谷本潤, Sagara, H., How the indirect reciprocity with co-evolving norm and strategy for 2 × 2 prisoner's dilemma game works for emerging cooperation, Physica A, 438, 595-602, 2016.01. |
| 384. | 谷本潤, 萩島 理, 池谷 直樹, 岩村泰郎, 福田枝里子, 中間的な感染防御策の存在が自発的感染防御行動に与える影響, 第21回交通流のシミュレーションシンポジウム, 15-18, 2015.12. |
| 385. | 谷本潤, 福田枝里子, ワクチン接種の意志決定を巡るジレンマ構図のゲーム理論的分析, 第21回交通流のシミュレーションシンポジウム, 11-14, 2015.12. |
| 386. | 谷本潤, 萩島 理, 池谷 直樹, Chung, J., Wind-tunnel study of scalar transfer phenomena for surfaces of block arrays and smooth walls with dry patches, Boundary-Layer Meteorology, 157, 219-236, 2015.11. |
| 387. | 谷本潤, 池谷 直樹, 萩島 理, Ikeda, Y, Razak,A.A., A prediction model for wind speed ratios at pedestrian level with simplified urban canopies, Theoretical and Applied Climatology, 1-11, 2015.11. |
| 388. | Jun Tanimoto, Correlated asynchronous behavior updating with a mixed strategy system in spatial prisoner's dilemma games enhances cooperation, Chaos, Solitons and Fractals, 10.1016/j.chaos.2015.03.021, 80, 39-46, 2015.11, [URL], A new model of mixed strategy system for spatial prisoner's dilemma games is proposed. As an alternative to the typical mixed strategy system, wherein a behavior of either cooperation or defection is stochastically determined for each neighbor based on the agent's overall strategy, in our mixed strategy system, the agent instead correlates his strategies with those of his neighbors. For example, he tends to offer cooperation more frequently to his neighbor who is cooperative more often. This model provides results with significantly enhanced cooperation compared with those obtained with the conventional mixed strategy model. Interestingly, some of the evolutionary paths followed under strong dilemma situations can be divided into two specific periods: Defector-Enduring (D-END), when the number of defectors rapidly decreases, and the subsequent Defector-Expanding (D-EXP), when the surviving defectors' clusters start to expand, allowing the global cooperation fraction to fall to a lower level. The D-END and D-EXP periods seem analogous to the END and EXP periods presented by the author in previous studies.. |
| 389. | Juyeon Chung, Aya Hagishima, Naoki Ikegaya, Jun Tanimoto, Wind-Tunnel Study of Scalar Transfer Phenomena for Surfaces of Block Arrays and Smooth Walls with Dry Patches, Boundary-Layer Meteorology, 10.1007/s10546-015-0063-3, 157, 2, 219-236, 2015.11, [URL], We report the result of a wind-tunnel experiment to measure the scalar transfer efficiency of three types of surfaces, wet street surfaces of cube arrays, wet smooth surfaces with dry patches, and fully wet smooth surfaces, to examine the effects of roughness topography and scalar source allocation. Scalar transfer coefficients defined by the source area CEwet for an underlying wet street surface of dry block arrays show a convex trend against the block density λp. Comparison with past data, and results for wet smooth surfaces including dry patches, reveal that the positive peak of CEwet with increasing λp is caused by reduced horizontal advection due to block roughness and enhanced evaporation due to a heterogeneous scalar source distribution. In contrast, scalar transfer coefficients defined by a lot-area including wet and dry areas CElot for smooth surfaces with dry patches indicate enhanced evaporation compared to the fully wet smooth surface (the oasis effect) for all three conditions of dry plan-area ratio up to 31 %. Relationships between the local Sherwood and Reynolds numbers derived from experimental data suggest that attenuation of CEwet for a wet street of cube arrays against streamwise distance is weaker than for a wet smooth surface because of canopy flow around the blocks. Relevant parameters of ratio of roughness length for momentum to scalar B-1 were calculated from observational data. The result implies that B-1 possibly increases with block roughness, and decreases with the partitioning of the scalar boundary layer because of dry patches.. |
| 390. | Zhen Wang, Satoshi Kokubo, Marko Jusup, Jun Tanimoto, Dilemma strength as a framework for advancing evolutionary game theory. Reply to comments on "Universal scaling for the dilemma strength in evolutionary games"., Physics of Life Reviews, 10.1016/j.plrev.2015.07.012, 14, 56-58, 2015.09, [URL]. |
| 391. | Zhen Wang, Satoshi Kokubo, Marko Jusup, Jun Tanimoto, Universal scaling for the dilemma strength in evolutionary games, PHYSICS OF LIFE REVIEWS, 10.1016/j.plrev.2015.04.033, 14, 1-30, 2015.09, Why would natural selection favor the prevalence of cooperation within the groups of selfish individuals? A fruitful framework to address this question is evolutionary game theory, the essence of which is captured in the so-called social dilemmas. Such dilemmas have sparked the development of a variety of mathematical approaches to assess the conditions under which cooperation evolves. Furthermore, borrowing from statistical physics and network science, the research of the evolutionary game dynamics has been enriched with phenomena such as pattern formation, equilibrium selection, and self-organization. Numerous advances in understanding the evolution of cooperative behavior over the last few decades have recently been distilled into five reciprocity mechanisms: direct reciprocity, indirect reciprocity, kin selection, group selection, and network reciprocity. However, when social viscosity is introduced into a population via any of the reciprocity mechanisms, the existing scaling parameters for the dilemma strength do not yield a unique answer as to how the evolutionary dynamics should unfold. Motivated by this problem, we review the developments that led to the present state of affairs, highlight the accompanying pitfalls, and propose new universal scaling parameters for the dilemma strength. We prove universality by showing that the conditions for an ESS and the expressions for the internal equilibriums in an infinite, well-mixed population subjected to any of the five reciprocity mechanisms depend only on the new scaling parameters. A similar result is shown to hold for the fixation probability of the different strategies in a finite, well-mixed population. Furthermore, by means of numerical simulations, the same scaling parameters are shown to be effective even if the evolution of cooperation is considered on the spatial networks (with the exception of highly heterogeneous setups). We close the discussion by suggesting promising directions for future research including (i) how to handle the dilemma strength in the context of co-evolution and (ii) where to seek opportunities for applying the game theoretical approach with meaningful impact. (C) 2015 Elsevier B.V. All rights reserved.. |
| 392. | 谷本潤, 松澤遼, 福田枝里子, 献身的な協調者が空間型囚人のジレンマゲームにおいて協調進化にもたらす影響, JWEIN 2015, 2015.08. |
| 393. | 谷本潤, 福田枝里子, 松澤遼, スケールフリーネットワークの次数相関がワクチン接種の意思決定に及ぼす影響, JWEIN 2015, 2015.08. |
| 394. | Jun Tanimoto, Hirokji Sagara, How the indirect reciprocity with co-evolving norm and strategy for 2 × 2 prisoner's dilemma game works for emerging cooperation, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2015.07.006, 438, 595-602, 2015.08, [URL], We built a new indirect reciprocity model based on binary image scores, where an agent's strategy and norm co-evolve. The norm, meaning what behavior is evaluated as "good" or "bad," stipulates how image scores of two agents playing a game is altered, which has been presumed to be a fixed value in most previous studies. Also, unlike former studies, our model allows an agent to play with an agent who has a different norm. This point of relaxing the freedom of the model pulls down cooperation level vis-à-vis the case where an agent always plays with another one having same norm. However, it is observed that a rather larger dilemma shows robust cooperation establishing compared with a smaller dilemma, since a norm that punishes a so-called second-order free-rider is prompted. To encourage the evolution of norms to be able to punish second-order free-riders, a society needs a small number of defectors. This is elucidated by the fact that cases with action error are more cooperative than those without action error.. |
| 395. | Jun Tanimoto, The impact of initial cooperation fraction on the evolutionary fate in a spatial prisoner's dilemma game, APPLIED MATHEMATICS AND COMPUTATION, 10.1016/j.amc.2015.04.043, 263, 171-188, 2015.07, Although the initial cooperation fraction and its arrangement obviously impacts the equilibrium in spatial prisoner's dilemma (SPD) games, most of the previous studies relying on a simulation approach have by conformity assumed a value of 0.5, thus implying an equal distribution of cooperators and defectors as the established premise. This study first points out that depending on target applications, i.e., biological or general evolutionary dynamical systems, we must select the initial cooperation fraction and its spatial distribution carefully to avoid a misleading conclusion. On the basis of comprehensive numerical experiments and a deductive discussion, wherein both the rule of strategy update and the underlying network are varied, we present a panoramic view of the effects of initial cooperation settings on evolutionary dynamics. Several non-trivial findings are revealed concerning the different impacts of deterministic or stochastic updating, or of homogeneous or heterogeneous underlying topology on evolutionary dynamics. (C) 2015 Elsevier Inc. All rights reserved.. |
| 396. | Tanimoto, Jun, The impact of initial cooperation fraction on the evolutionary fate in a spatial prisoner's dilemma game, Applied Mathematics and Computation, 2015.06. |
| 397. | Tanimoto, Jun, Eriko Fukuda, Mitsuhiro Akimoto, Influence of breaking the symmetry between disease transmission and information propagation networks on stepwise decisions concerning vaccination, Chaos, Solitons & Fractals, http://dx.doi.org/10.1016/j.chaos.2015.04.018, 80, 47-55, 2015.06. |
| 398. | Tanimoto, Jun, Satoshi Kokubo, Zheng Wang, Marco Jusup, Universal scaling for the dilemma strength in evolutionary games, Physics of Life Reviews, http://dx.doi.org/10.1016/j.plrev.2015.04.033, 2015.06, Why would natural selection favor the prevalence of cooperation within the groups of selfish individuals? A fruitful framework to address this question is evolutionary game theory, the essence of which is captured in the so-called social dilemmas. Such dilemmas have sparked the development of a variety of mathematical approaches to assess the conditions under which cooperation evolves. Furthermore, borrowing from statistical physics and network science, the research of the evolutionary game dynamics has been enriched with phenomena such as pattern formation, equilibrium selection, and self-organization. Numerous advances in understanding the evolution of cooperative behavior over the last few decades have recently been distilled into five reciprocity mechanisms: direct reciprocity, indirect reciprocity, kin selection, group selection, and network reciprocity. However, when social viscosity is introduced into a population via any of the reciprocity mechanisms, the existing scaling parameters for the dilemma strength do not yield a unique answer as to how the evolutionary dynamics should unfold. Motivated by this problem, we review the developments that led to the present state of affairs, highlight the accompanying pitfalls, and propose new universal scaling parameters for the dilemma strength. We prove universality by showing that the conditions for an ESS and the expressions for the internal equilibriums in an infinite, well-mixed population subjected to any of the five reciprocity mechanisms depend only on the new scaling parameters. A similar result is shown to hold for the fixation probability of the different strategies in a finite, well-mixed population. Furthermore, by means of numerical simulations, the same scaling parameters are shown to be effective even if the evolution of cooperation is considered on the spatial networks (with the exception of highly heterogeneous setups). We close the discussion by suggesting promising directions for future research including (i) how to handle the dilemma strength in the context of co-evolution and (ii) where to seek opportunities for applying the game theoretical approach with meaningful impact.. |
| 399. | Jun Tanimoto, Considering individual satisfaction levels enhances cooperation in a spatial prisoner's dilemma game, Chaos, Solitons and Fractals, 10.1016/j.chaos.2015.02.025, 80, 24-30, 2015.06, [URL], Based on the observance in human society, the satisfaction level of an individual as a result of an obtained payoff depends on personal tendency to some extent; we establish a new model for spatial prisoner's dilemma games. We describe individual satisfaction as a stochastically deviated value around each of the four payoffs stipulated by a payoff matrix, which is maintained throughout the life of a certain agent. When strategy updating, an agent who refers to his own satisfaction level cannot see neighbors' satisfaction levels but can only observe neighbors' accumulated payoffs. By varying the update rule and underlying topology, we perform numerical simulations that reveal cooperation is significantly enhanced by this change. We argue that this enhancement of cooperation is analogous to a stochastic resonance effect, like the payoff noise effects Perc (2006).. |
| 400. | Eriko Fukuda, Jun Tanimoto, Mitsuhiro Akimoto, Influence of breaking the symmetry between disease transmission and information propagation networks on stepwise decisions concerning vaccination, Chaos, Solitons and Fractals, 10.1016/j.chaos.2015.04.018, 80, 47-55, 2015.06, [URL], In previous epidemiological studies that address adaptive vaccination decisions, individuals generally act within a single network, which models the population structure. However, in reality, people are typically members of multiplex networks, which have various community structures. For example, a disease transmission network, which directly transmits infectious diseases, does not necessarily correspond with an information propagation network, in which individuals directly or indirectly exchange information concerning health conditions and vaccination strategies. The latter network may also be used for strategic interaction (strategy adaptation) concerning vaccination. Therefore, in order to reflect this feature, we consider the vaccination dynamics of structured populations whose members simultaneously belong to two types of networks: disease transmission and information propagation. Applying intensive numerical calculations, we determine that if the disease transmission network is modeled using a regular graph, such as a lattice population or random regular graph containing individuals of equivalent degrees, individuals should base their vaccination decisions on a different type of network. However, if the disease transmission network is a degree-heterogeneous graph, such as the Barabási-Albert scale-free network, which has a heterogeneous degree according to power low, then using the same network for information propagation more effectively prevents the spread of epidemics. Furthermore, our conclusions are unaffected by the relative cost of vaccination.. |
| 401. | Tanimoto, Jun, Network reciprocity created in prisoner’s dilemma games by coupling two mechanisms, Physical Review E , 2015.05. |
| 402. | Tanimoto, Jun, Correlated asynchronous behavior updating with a mixed strategy system in spatial prisoner's dilemma games enhances cooperation, Chaos, Solitons & Fractals, http://dx.doi.org/10.1016/j.chaos.2015.03.021, 80, 39-46, 2015.05. |
| 403. | Satoshi Kokubo, Zhen Wang, Tanimoto, Jun, Spatial reciprocity for discrete, continuous and mixed strategy setups, Applied Mathematics and Computation , http://dx.doi.org/10.1016/j.amc.2015.03.018, 259, 562-568, 2015.05. |
| 404. | 池谷直樹, 鄭朱娟, 萩島理, 谷本潤, 立方体粗度面上の速度･濃度プロファイルの相似性，日本建築学会環境系論文集, 日本建築学会環境系論文集, 80, 711, 451-459, 2015.05. |
| 405. | Satoshi Kokubo, Zhen Wang, Jun Tanimoto, Spatial reciprocity for discrete, continuous and mixed strategy setups, Applied Mathematics and Computation, 10.1016/j.amc.2015.03.018, 259, 552-568, 2015.05, [URL], The existence of cooperation in the social dilemma has been extensively studied based on spatial structure populations, namely, the so-called spatial reciprocity. However, vast majority of existing works just simply presume that agents can offer the discrete choice: either the cooperative (C) or defective (D) strategy, which, to some extent, seems unrealistic in the empirical observations since actual options might be continuous, mixed rather than discrete. Here, we propose discrete, continuous and mixed strategy setups in the social dilemma games and further explore their performance on network populations. Interestingly, it is unveiled that there is actually considerable inconsistency in terms of equilibrium among different strategy games. Furthermore, we reveal how different cooperative arrangements among these three strategy setups can be established, depending on whether the presumed dilemma subclass is a boundary game between prisoner's dilemma game and Chicken game or between prisoner's dilemma game and Stag-Hunt game.. |
| 406. | Jun Tanimoto, The impact of initial cooperation fraction on the evolutionary fate in a spatial prisoner's dilemma game, Applied Mathematics and Computation, 10.1016/j.amc.2015.04.043, 263, 171-188, 2015.05, [URL], Abstract Although the initial cooperation fraction and its arrangement obviously impacts the equilibrium in spatial prisoner's dilemma (SPD) games, most of the previous studies relying on a simulation approach have by conformity assumed a value of 0.5, thus implying an equal distribution of cooperators and defectors as the established premise. This study first points out that depending on target applications, i.e., biological or general evolutionary dynamical systems, we must select the initial cooperation fraction and its spatial distribution carefully to avoid a misleading conclusion. On the basis of comprehensive numerical experiments and a deductive discussion, wherein both the rule of strategy update and the underlying network are varied, we present a panoramic view of the effects of initial cooperation settings on evolutionary dynamics. Several non-trivial findings are revealed concerning the different impacts of deterministic or stochastic updating, or of homogeneous or heterogeneous underlying topology on evolutionary dynamics.. |
| 407. | Satoshi Kokubo, Zhen Wang, Jun Tanimoto, Spatial reciprocity for discrete, continuous and mixed strategy setups, APPLIED MATHEMATICS AND COMPUTATION, 10.1016/j.amc.2015.03.018, 259, 552-568, 2015.05, The existence of cooperation in the social dilemma has been extensively studied based on spatial structure populations, namely, the so-called spatial reciprocity. However, vast majority of existing works just simply presume that agents can offer the discrete choice: either the cooperative (C) or defective (D) strategy, which, to some extent, seems unrealistic in the empirical observations since actual options might be continuous, mixed rather than discrete. Here, we propose discrete, continuous and mixed strategy setups in the social dilemma games and further explore their performance on network populations. Interestingly, it is unveiled that there is actually considerable inconsistency in terms of equilibrium among different strategy games. Furthermore, we reveal how different cooperative arrangements among these three strategy setups can be established, depending on whether the presumed dilemma subclass is a boundary game between prisoner's dilemma game and Chicken game or between prisoner's dilemma game and Stag-Hunt game. (C) 2015 Elsevier Inc. All rights reserved.. |
| 408. | Tanimoto, Jun, Fujiki, Takuya, Kukida, Shinji, Naoki Ikegaya, Aya Hagishima, Acquisition of the field measurement data relating to lane change actions, International Journal of Modern Physics C, http://dx.doi.org/10.1142/S0129183115500722, 26, 1550072-1550072, 2015.04. |
| 409. | Tanimoto, Jun, Considering individual satisfaction levels enhances cooperation in a spatial prisoner's dilemma game, Chaos, Solitons & Fractals, http://dx.doi.org/10.1016/j.chaos.2015.02.025, 80, 24-30, 2015.04. |
| 410. | Tanimoto, Jun, Nobuyuki Kishimoto, Network reciprocity created in prisoner’s dilemma games by coupling two mechanisms, Physical Review E, http://dx.doi.org/10.1103/PhysRevE.91.042106, 91, 042106-042106, 2015.04. |
| 411. | Jun Tanimoto, Nobuyuki Kishimoto, Network reciprocity created in prisoner's dilemma games by coupling two mechanisms, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.91.042106, 91, 4, 2015.04, [URL], We found that a nontrivial enhancement of network reciprocity for 2 × 2 prisoner's dilemma games can be achieved by coupling two mechanisms. The first mechanism presumes a larger strategy update neighborhood than the conventional first neighborhood on the underlying network. The second is the strategy-shifting rule. At the initial time step, the averaged cooperation extent is assumed to be 0.5. In the case of strategy shifting, an agent adopts a continuous strategy definition during the initial period of a simulation episode (when the global cooperation fraction decreases from its initial value of 0.5; that is, the enduring period). The agent then switches to a discrete strategy definition in the time period afterwards (when the global cooperation fraction begins to increase again; that is, the expanding period). We explored why this particular enhancement comes about, and to summarize, the continuous strategy during the initial period relaxes the conditions for the survival of relatively cooperative clusters, and the large strategy adaptation neighborhood allows those cooperative clusters to expand easily.. |
| 412. | Jun Tanimoto, Nobuyuki Kishimoto, Network reciprocity created in prisoner's dilemma games by coupling two mechanisms, PHYSICAL REVIEW E, 10.1103/PhysRevE.91.042106, 91, 4, 2015.04, We found that a nontrivial enhancement of network reciprocity for 2 x 2 prisoner's dilemma games can be achieved by coupling two mechanisms. The first mechanism presumes a larger strategy update neighborhood than the conventional first neighborhood on the underlying network. The second is the strategy-shifting rule. At the initial time step, the averaged cooperation extent is assumed to be 0.5. In the case of strategy shifting, an agent adopts a continuous strategy definition during the initial period of a simulation episode (when the global cooperation fraction decreases from its initial value of 0.5; that is, the enduring period). The agent then switches to a discrete strategy definition in the time period afterwards (when the global cooperation fraction begins to increase again; that is, the expanding period). We explored why this particular enhancement comes about, and to summarize, the continuous strategy during the initial period relaxes the conditions for the survival of relatively cooperative clusters, and the large strategy adaptation neighborhood allows those cooperative clusters to expand easily.. |
| 413. | 池田恭彰, 萩島理, 池谷直樹, 谷本潤, Razak,Azki Abd, Estimation of wind speed in urban perestrian spaces on the basis of Large-Eddy Simulation, 日本建築学会環境系論文集, 80, 709, 259-267, 2015.03. |
| 414. | Jun Tanimoto, Hiromichi Fujino, Hiroki Takahashi, Toshihiko Murayama, Human EP2 prostanoid receptors exhibit more constraints to mutations than human DP prostanoid receptors, FEBS LETTERS, 10.1016/j.febslet.2015.02.006, 589, 6, 766-772, 2015.03, Human D-type prostanoid (DP) and E-type prostanoid 2 (EP2) receptors are regarded as the most closely related receptors among prostanoid receptors. Although these receptors are generated by tandem duplication, their physiological outputs often oppose one another. In the present study, we extracted mutations occurring in the coding regions of both receptors using the 1000 genome project database and found that EP2 receptors have 8-fold fewer amino acid mutations. We speculate that EP2 receptors exhibit more constraints to mutations than DP receptors. (C) 2015 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.. |
| 415. | Tanimoto, Jun, Ogasawara, Takashi, Dynamic noise from action errors enhances network reciprocity in the prisoner’s dilemma game, Journal of Statistical Mechanics: Theory and Experiment, http://dx.doi.org/10.1088/1742-5468/2015/01/P01033, P1033, 2015.01. |
| 416. | Jun Tanimoto, Takuya Fujiki, Shinji Kukida, Naoki Ikegaya, Aya Hagishima, Acquisition of the field measurement data relating to lane change actions, International Journal of Modern Physics C, 10.1142/S0129183115500722, 26, 7, 2015.01, [URL], As a data set for validation of microscopic simulation models, we obtained the fundamental diagram (flux versus density relation), and the relations of velocity versus density, lane usage ratio versus density and lane-changing frequency versus density derived from a single field measurement campaign held at a Japanese urban expressway. The results were drawn from image analysis of video camera data obtained at the site.. |
| 417. | Jun Tanimoto, Takashi Ogasawara, Dynamic noise from action errors enhances network reciprocity in the prisoner's dilemma game, Journal of Statistical Mechanics: Theory and Experiment, 10.1088/1742-5468/2015/01/P01033, 2015, 1, 2015.01, [URL], Inspired by the fact that people make mistakes in a transient, fluctuating or chaotic environment, we establish a spatial prisoner's dilemma model where an agent commits action errors proportionally varying with the increasing/decreasing rate of the global cooperation fraction. A series of numerical simulations reveal that the cooperation level is enhanced in games in which the stag hunt (SH)-type dilemma is dominant; however, it is slightly diminished in games in which the chicken-type dilemma is dominant, compared with the standard network reciprocity model. Intensive analysis reveals that the noise created by the action error contribute to the spatial expansion of a cooperators' cluster, because a dilemma that is less chicken-type and more SH-type makes it disadvantageous for defectors to neighbor cooperators. Our finding, that errors in behavior in a chaotic environment contribute to the evolution of cooperation, might aim to explain the problem of how network reciprocity works.. |
| 418. | Naoki Ikegaya, Juyeon Chung, Aya Hagishima, Jun Tanimoto, Similarity between velocity and scalar profiles over cubical block array, Journal of Environmental Engineering (Japan), 10.3130/aije.80.451, 80, 711, 451-459, 2015.01, [URL], We have performed wind-tunnel experiments to measure velocity and scalar concentration profiles over urban-like roughness arrays and reveal important characteristics of scalar dispersion in the boundary layer over rough wall as follows. First, comparison of profiles reveals that the scalar concentration boundary layer depth reaches almost consistent depth of momentum boundary layer, meaning that scalar is passively transported or diffused in boundary layer. In addition, the development of the boundary layer is steeper than that of smooth surface. Secondly, aerodynamic parameters, such as roughness length and displacement height are determined for both momentum and scalar. It reveals that the roughness length of scalar is smaller than that of momentum by the order of 10-2 and can be well estimated by well-known scale-similarity model. Thirdly, roughness function of the momentum and scalar are determined and compared with several previous results. The roughness function of scalar for the present study lies between that of smooth and rough wall because of scale effect of scalar and decrease of Re number dependency.. |
| 419. | Zhen Wang, Satoshi Kokubo, Marko Jusup, Jun Tanimoto, Universal scaling for the dilemma strength in evolutionary games, Physics of Life Reviews, 10.1016/j.plrev.2015.04.033, 14, 1-30, 2015.01, [URL], Why would natural selection favor the prevalence of cooperation within the groups of selfish individuals? A fruitful framework to address this question is evolutionary game theory, the essence of which is captured in the so-called social dilemmas. Such dilemmas have sparked the development of a variety of mathematical approaches to assess the conditions under which cooperation evolves. Furthermore, borrowing from statistical physics and network science, the research of the evolutionary game dynamics has been enriched with phenomena such as pattern formation, equilibrium selection, and self-organization. Numerous advances in understanding the evolution of cooperative behavior over the last few decades have recently been distilled into five reciprocity mechanisms: direct reciprocity, indirect reciprocity, kin selection, group selection, and network reciprocity. However, when social viscosity is introduced into a population via any of the reciprocity mechanisms, the existing scaling parameters for the dilemma strength do not yield a unique answer as to how the evolutionary dynamics should unfold. Motivated by this problem, we review the developments that led to the present state of affairs, highlight the accompanying pitfalls, and propose new universal scaling parameters for the dilemma strength. We prove universality by showing that the conditions for an ESS and the expressions for the internal equilibriums in an infinite, well-mixed population subjected to any of the five reciprocity mechanisms depend only on the new scaling parameters. A similar result is shown to hold for the fixation probability of the different strategies in a finite, well-mixed population. Furthermore, by means of numerical simulations, the same scaling parameters are shown to be effective even if the evolution of cooperation is considered on the spatial networks (with the exception of highly heterogeneous setups). We close the discussion by suggesting promising directions for future research including (i) how to handle the dilemma strength in the context of co-evolution and (ii) where to seek opportunities for applying the game theoretical approach with meaningful impact.. |
| 420. | Jun Tanimoto, Takashi Ogasawara, Dynamic noise from action errors enhances network reciprocity in the prisoner's dilemma game, JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, 10.1088/1742-5468/2015/01/P01033, 2015, 1, 2015.01, Inspired by the fact that people make mistakes in a transient, fluctuating or chaotic environment, we establish a spatial prisoner's dilemma model where an agent commits action errors proportionally varying with the increasing/decreasing rate of the global cooperation fraction. A series of numerical simulations reveal that the cooperation level is enhanced in games in which the stag hunt (SH)-type dilemma is dominant; however, it is slightly diminished in games in which the chicken-type dilemma is dominant, compared with the standard network reciprocity model. Intensive analysis reveals that the noise created by the action error contribute to the spatial expansion of a cooperators' cluster, because a dilemma that is less chicken-type and more SH-type makes it disadvantageous for defectors to neighbor cooperators. Our finding, that errors in behavior in a chaotic environment contribute to the evolution of cooperation, might aim to explain the problem of how network reciprocity works.. |
| 421. | Yasuaki Ikeda, Aya Hagishima, Naoki Ikegaya, Jun Tanimoto, Azli Abd Razak, Estimation of wind speed in urban pedestrian spaces on the basis of large-eddy simulation, Journal of Environmental Engineering (Japan), 80, 709, 259-267, 2015, The wind speeds in pedestrian spaces for staggered rectangular block arrays derived from large-eddy simulations are analyzed to model the urban pedestrian wind environment. The authors defined the area within 3 m of block walls as the pedestrian space and compared wind speeds in it under various geometric conditions. According to the result, the wind speeds in pedestrian spaces are influenced by the plan area ratio (λp) and block aspect ratio (αp). In addition, an exponential equation in terms of λp and αp can estimate the wind speed ratio well at the pedestrian level, especially for regions in front of blocks.. |
| 422. | Tanimoto, Jun, Ogasawara, Takashi, Fukuda, Eriko, Aya Hagishima, Naoki Ikegaya, Effect of a large gaming neighborhood and a strategy adaptation neighborhood for bolstering network reciprocity in a prisoner's dilemma game, Journal of Statistical Mechanics: Theory and Experiment, http://iopscience.iop.org/1742-5468/2014/12/P12024/, P12024, 2014.12. |
| 423. | 谷本潤, 福田枝里子, 萩島理, 池谷直樹, 頑固な個人が社会ネットワーク上における自発的ワクチン接種行動に与える影響, 第20回交通流のシミュレーションシンポジウム, 75-78, 2014.12. |
| 424. | 谷本潤, 松澤遼, 萩島理, 池谷直樹, 拡散場における社会ジレンマ下で協調は進化できるか？, 第20回交通流のシミュレーションシンポジウム, 71-74, 2014.12. |
| 425. | 小笠原崇, 谷本潤, 福田枝里子, 萩島理, 池谷直樹, エージェントの行動エラーが空間型囚人のジレンマゲームにおける協調進化に与える影響, 第20回交通流のシミュレーションシンポジウム, 67-70, 2014.12. |
| 426. | Takashi Ogasawara, Jun Tanimoto, Eriko Fukuda, Aya Hagishima, Naoki Ikegaya, Effect of a large gaming neighborhood and a strategy adaptation neighborhood for bolstering network reciprocity in a prisoner's dilemma game, Journal of Statistical Mechanics: Theory and Experiment, 10.1088/1742-5468/2014/12/P12024, 2014, 12, 2014.12, [URL], In 22 prisoner's dilemma (PD) games, network reciprocity is one mechanism for adding social viscosity, leading to a cooperative equilibrium. In this paper, we explain how gaming neighborhoods and strategy-adaptation neighborhoods affect network reciprocity independently in spatial PD games. We explore an appropriate range of strategy adaptation neighborhoods as opposed to the conventional method of making the gaming and strategy adaptation neighborhoods coincide to enhance the level of cooperation. In cases of expanding gaming neighborhoods, network reciprocity falls to a low level relative to the conventional setting. In the discussion below, which is based on the results of our simulation, we explore how these enhancements come about. Essentially, varying the range of the neighborhoods influences how cooperative clusters form and expand in the evolutionary process.. |
| 427. | Takashi Ogasawara, Jun Tanimoto, Eriko Fukuda, Aya Hagishima, Naoki Ikegaya, Effect of a large gaming neighborhood and a strategy adaptation neighborhood for bolstering network reciprocity in a prisoner's dilemma game, JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, 10.1088/1742-5468/2014/12/P12024, 2014, 12, 2014.12, In 2 x 2 prisoner's dilemma (PD) games, network reciprocity is one mechanism for adding social viscosity, leading to a cooperative equilibrium. In this paper, we explain how gaming neighborhoods and strategy-adaptation neighborhoods affect network reciprocity independently in spatial PD games. We explore an appropriate range of strategy adaptation neighborhoods as opposed to the conventional method of making the gaming and strategy adaptation neighborhoods coincide to enhance the level of cooperation. In cases of expanding gaming neighborhoods, network reciprocity falls to a low level relative to the conventional setting. In the discussion below, which is based on the results of our simulation, we explore how these enhancements come about. Essentially, varying the range of the neighborhoods influences how cooperative clusters form and expand in the evolutionary process.. |
| 428. | Tanimoto, Jun, Dynamics of spatial traveler’s dilemma games, Journal of Statistical Mechanics: Theory and Experiment, http://iopscience.iop.org/1742-5468/2014/11/P11010/, P11010, 2014.11. |
| 429. | Tanimoto, Jun, Fujiki, Takuya, Wang, Zhen, Aya Hagishima, Naoki Ikegaya, Dangerous drivers foster social dilemma structures hidden behind a traffic flow with lane changes, Journal of Statistical Mechanics: Theory and Experiment, http://dx.doi.org/10.1088/1742-5468/2014/11/P11027, P11027, 2014.11. |
| 430. | Fukuda, Eriko, Tanimoto, Jun, Impact of stubborn individuals on spread of infectious disease under voluntary vaccination policy, Proc. of 18th Asia Pacific System on Intelligent and Evolutionary System, CD-ROM, 2014.11. |
| 431. | Ogasawara, Takashi, Tanimoto, Jun, Fukuda, Eriko, Aya Hagishima, Naoki Ikegaya, Large strategy adaptation neighborhood bolsters network reciprocity in prisoner's dilemma, Proc. of 18th Asia Pacific System on Intelligent and Evolutionary System, CD-ROM, 2014.11. |
| 432. | Jun Tanimoto, Takuya Fujiki, Zhen Wang, Aya Hagishima, Naoki Ikegaya, Dangerous drivers foster social dilemma structures hidden behind a traffic flow with lane changes, Journal of Statistical Mechanics: Theory and Experiment, 10.1088/1742-5468/2014/11/P11027, 2014, 11, 2014.11, [URL], Motivated by the fact that there are quite a few ill-mannered drivers who disregard traffic rules concerning lane-changing and maximum speed, we investigated an interesting question: whether or not social dilemma structures can be formed from a frequent dangerous lane-changing attitude in a typical traffic flow without any explicit bottlenecks. In our model system, two classes of driver-agents coexist: C agents (cooperative strategy) always keep to traffic regulations with respect to lane-changing and speed, while D agents (defective strategy) disregard them to move ahead. In relatively high-density flows, such as the metastable and high-density phases, we found structures that correspond to either n-person Prisoner's Dilemma (n-PD) games or to quasi-PD games. In these situations, existing ill-mannered drivers create heavy traffic jams that reduce social efficiency.. |
| 433. | Jun Tanimoto, Dynamics of spatial traveler's dilemma games, Journal of Statistical Mechanics: Theory and Experiment, 10.1088/1742-5468/2014/11/P11010, 2014, 11, 2014.11, [URL], By examining payoff structures, we elucidate the traveler's dilemma (TD) game. It can be said that the TD game as the 2-player & multi-strategy game is a variant of the donor & recipient game, which itself is a subclass of the 2-player & 2-strategy (2 x 2) prisoner's dilemma, in the sense that the Nash equilibrium and fair Pareto optimum appear on mutual defection and mutual cooperation, respectively. Exploring spatial TD games, we observed that the network reciprocity of TD games can be universally scaled with a single dilemma parameter as can be performed in usual 2 x 2 games. Furthermore, we observed a local peak event reflecting a resurging cooperation fraction with increasing dilemma strength after degradation to a low level. We successfully demonstrate that this is caused by the specific dynamics of TD games created by their specific payoff structure.. |
| 434. | Jun Tanimoto, Takuya Fujiki, Zhen Wang, Aya Hagishima, Naoki Ikegaya, Dangerous drivers foster social dilemma structures hidden behind a traffic flow with lane changes, JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, 10.1088/1742-5468/2014/11/P11027, 2014, 11, 2014.11, Motivated by the fact that there are quite a few ill-mannered drivers who disregard traffic rules concerning lane-changing and maximum speed, we investigated an interesting question: whether or not social dilemma structures can be formed from a frequent dangerous lane-changing attitude in a typical traffic flow without any explicit bottlenecks. In our model system, two classes of driver-agents coexist: C agents (cooperative strategy) always keep to traffic regulations with respect to lane-changing and speed, while D agents (defective strategy) disregard them to move ahead. In relatively high-density flows, such as the metastable and high-density phases, we found structures that correspond to either n-person Prisoner's Dilemma (n-PD) games or to quasi-PD games. In these situations, existing ill-mannered drivers create heavy traffic jams that reduce social efficiency.. |
| 435. | Jun Tanimoto, Dynamics of spatial traveler's dilemma games, JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, 10.1088/1742-5468/2014/11/P11010, 2014, 11, 2014.11, By examining payoff structures, we elucidate the traveler's dilemma (TD) game. It can be said that the TD game as the 2-player & multi-strategy game is a variant of the donor & recipient game, which itself is a subclass of the 2-player & 2-strategy (2 x 2) prisoner's dilemma, in the sense that the Nash equilibrium and fair Pareto optimum appear on mutual defection and mutual cooperation, respectively. Exploring spatial TD games, we observed that the network reciprocity of TD games can be universally scaled with a single dilemma parameter as can be performed in usual 2 x 2 games. Furthermore, we observed a local peak event reflecting a resurging cooperation fraction with increasing dilemma strength after degradation to a low level. We successfully demonstrate that this is caused by the specific dynamics of TD games created by their specific payoff structure.. |
| 436. | Eriko Fukuda, Satoshi Kokubo, Jun Tanimoto, Zhen Wang, Aya Hagishima, Naoki Ikegaya, Risk assessment for infectious disease and its impact on voluntary vaccination behavior in social networks, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2014.07.004, 68, 1-9, 2014.11, Achievement of the herd immunity is essential for preventing the periodic spreading of an infectious disease such as the flu. If vaccination is voluntary, as vaccination coverage approaches the critical level required for herd immunity, there is less incentive for individuals to be vaccinated; this results in an increase in the number of so-called "free-riders" who craftily avoid infection via the herd immunity and avoid paying any cost. We use a framework originating in evolutionary game theory to investigate this type of social dilemma with respect to epidemiology and the decision of whether to be vaccinated. For each individual in a population, the decision on vaccination is associated with how one assesses the risk of infection. In this study, we propose a new risk-assessment model in a vaccination game when an individual updates her strategy, she compares her own payoff to a net payoff obtained by averaging a collective payoff over individuals who adopt the same strategy as that of a randomly selected neighbor. In previous studies of vaccination games, when an individual updates her strategy, she typically compares her payoff to the payoff of a randomly selected neighbor, indicating that the risk for changing her strategy is largely based on the behavior of one other individual, i.e., this is an individual-based risk assessment. However, in our proposed model, risk assessment by any individual is based on the collective success of a strategy and not on the behavior of any one other individual. For strategy adaptation, each individual always takes a survey of the degree of success of a certain strategy that one of her neighbors has adopted, i.e., this is a strategy-based risk assessment. Using computer simulations, we determine how these two different risk-assessment methods affect the spread of an infectious disease over a social network. The proposed model is found to benefit the population, depending on the structure of the social network and cost of vaccination. Our results suggest that individuals (or governments) should understand the structure of their social networks at the regional level, and accordingly, they should adopt an appropriate risk-assessment methodology as per the demands of the situation. (C) 2014 Elsevier Ltd. All rights reserved.. |
| 437. | Fukuda, Eriko, Kokubo, Satoshi, Tanimoto, Jun, Wang, Zhen, Aya Hagishima, Naoki Ikegaya, Risk assessment for infectious disease and its impact on voluntary vaccination behavior in social networks, Chaos, Solitons & Fractals, http://dx.doi.org/10.1016/j.chaos.2014.07.004, 68, 1-9, 2014.10. |
| 438. | 谷本潤, 進化ゲームとマルチエージェントシミュレーションを適用した社会ネットワーク上を伝搬する感染症に関するワクチン接種行動のモデル化, 混相流, 28, 3, 280-287, 2014.09. |
| 439. | 谷本潤, Kukida Shinji, 池谷直樹, 萩島理, Analytical solutions of Fukui-Ishibashi (FI) model and Quick-Start (QS) model, Journal of Applied Mathematics and Physics, http://dx.doi.org/10.4236/jamp.2014.27076, 2, 7, 691-697, 2014.08. |
| 440. | Tanimoto, Jun, Kukida, Shinji, Aya Hagishima, Social dilemma structures hidden behind a traffic flow with lane changes, Journal of Statistical Mechanics: Theory and Experiment, http://dx.doi.org/ 10.1088/1742-5468/2014/07/P07019, P07019, 2014.08. |
| 441. | Tanimoto, Jun, Impact of deterministic and stochastic updates on network reciprocity in prisoner's dilemma game, Physical Review E, http://link.aps.org/doi/10.1103/PhysRevE.90.022105, 90, 022105, 2014.08. |
| 442. | Tanimoto, Jun, Shinji Kukida, Aya Hagishima, Naoki Ikegaya, Traffic flow simulation dovetailed with evolutionary game theory, Proc. of 4th International Conference on Simulation and modeling Methodologies, Technologies and Applications, 2014.08. |
| 443. | Jun Tanimoto, Impact of deterministic and stochastic updates on network reciprocity in the prisoner's dilemma game, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.90.022105, 90, 2, 2014.08, [URL], In 2 × 2 prisoner's dilemma games, network reciprocity is one mechanism for adding social viscosity, which leads to cooperative equilibrium. This study introduced an intriguing framework for the strategy update rule that allows any combination of a purely deterministic method, imitation max (IM), and a purely probabilistic one, pairwise Fermi (Fermi-PW). A series of simulations covering the whole range from IM to Fermi-PW reveals that, as a general tendency, the larger fractions of stochastic updating reduce network reciprocity, so long as the underlying lattice contains no noise in the degree of distribution. However, a small amount of stochastic flavor added to an otherwise perfectly deterministic update rule was actually found to enhance network reciprocity. This occurs because a subtle stochastic effect in the update rule improves the evolutionary trail in games having more stag-hunt-type dilemmas, although the same stochastic effect degenerates evolutionary trails in games having more chicken-type dilemmas. We explain these effects by dividing evolutionary trails into the enduring and expanding periods defined by Shigaki et al. [Phys. Rev. E 86, 031141 (2012)PRESCM1539-375510.1103/PhysRevE.86.031141] .. |
| 444. | Naoko Konno, Azusa Ono, Akashi Mochida, Takashi Maruyama, Aya Hagishima, Jun Tanimoto, Modelling of canopy flow of the various roughness arrays Method to determine the model coefficients applicable to staggered roughness arrays with various densities and configurations, Journal of Environmental Engineering (Japan), 79, 702, 699-707, 2014.08, The final goal of this research is to develop a generalized canopy model describing the effects of obstacles with various configurations and densities, such as automobiles and pedestrians on wind environment and turbulent diffusion in urban areas. A series of wind tunnel experiments was carried out to measure wind velocity profiles and drag forces acting on five shapes of roughness elements with different densities. The two of them represented car shapes and the others represented human shapes. CFD predictions were conducted for the equivalent configurations as those implemented in wind tunnel tests. The numerical experiment was conducted by changing the coefficients of the developed canopy model. The model coefficients were optimized by comparing with the experimental data and a new method to determine the model coefficients and definitions of the shape factors applicable to various obstacles were proposed.. |
| 445. | Jun Tanimoto, Impact of deterministic and stochastic updates on network reciprocity in the prisoner's dilemma game, PHYSICAL REVIEW E, 10.1103/PhysRevE.90.022105, 90, 2, 2014.08, In 2 x 2 prisoner's dilemma games, network reciprocity is one mechanism for adding social viscosity, which leads to cooperative equilibrium. This study introduced an intriguing framework for the strategy update rule that allows any combination of a purely deterministic method, imitation max (IM), and a purely probabilistic one, pairwise Fermi (Fermi-PW). A series of simulations covering the whole range from IM to Fermi-PW reveals that, as a general tendency, the larger fractions of stochastic updating reduce network reciprocity, so long as the underlying lattice contains no noise in the degree of distribution. However, a small amount of stochastic flavor added to an otherwise perfectly deterministic update rule was actually found to enhance network reciprocity. This occurs because a subtle stochastic effect in the update rule improves the evolutionary trail in games having more stag-hunt-type dilemmas, although the same stochastic effect degenerates evolutionary trails in games having more chicken-type dilemmas. We explain these effects by dividing evolutionary trails into the enduring and expanding periods defined by Shigaki et al. [Phys. Rev. E 86, 031141 (2012)].. |
| 446. | Jun Tanimoto, Shinji Kukida, Aya Hagishima, Social dilemma structures hidden behind traffic flow with lane changes, Journal of Statistical Mechanics: Theory and Experiment, 10.1088/1742-5468/2014/07/P07019, 2014, 7, 2014.07, [URL], Aiming to merge traffic flow analysis with evolutionary gametheory, we investigated the question of whether such structures can be formedfrom frequent lane changes in usual traffic flow without any explicit bottlenecks.In our model system, two classes of driver-agents coexist: C-agents (cooperativestrategy) always remain in the lane they are initially assigned, whereas D-agents(defective strategy) try to change lanes to move ahead. In relatively high-densityflows, such as the metastable and high-density phases, we found structuresthat correspond to either n-person prisoner dilemma (n-PD) games or quasi-PDgames. In these situations, lane changes by D-agents create heavy traffic jamsthat reduce social efficiency.. |
| 447. | Jun Tanimoto, Takuya Fujiki, Zhen Wang, Aya Hagishima, Naoki Ikegaya, Dangerous drivers foster social dilemma structures hidden behind a traffic flow with lane changes, JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, 10.1088/1742-5468/2014/11/P11027, 2014.11, Aiming to merge traffic flow analysis with evolutionary game theory, we investigated the question of whether such structures can be formed from frequent lane changes in usual traffic flow without any explicit bottlenecks. In our model system, two classes of driver-agents coexist: C-agents (cooperative strategy) always remain in the lane they are initially assigned, whereas D-agents (defective strategy) try to change lanes to move ahead. In relatively high-density flows, such as the metastable and high-density phases, we found structures that correspond to either n-person prisoner dilemma (n-PD) games or quasi-PD games. In these situations, lane changes by D-agents create heavy traffic jams that reduce social efficiency.. |
| 448. | 谷本潤, 『旗本三嶋政養日記』にみる幕末期中級旗本の居住様態及び家政変遷に関する小考, 日本建築学会計画系論文集, 79, 699, 2014.05. |
| 449. | Jun Tanimoto, Assortative and dissortative priorities for game interaction and strategy adaptation significantly bolster network reciprocity in the prisoner's dilemma, JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, 10.1088/1742-5468/2014/05/P05003, 2014, 5, 2014.05, It 2 x 2 prisoner's dilemma games, network reciprocity is one mechanism for adding social viscosity, which leads to cooperative equilibrium. Here we show that combining the process for selecting a gaming partner with the process for selecting an adaptation partner significantly enhances cooperation, even though such selection processes require additional costs to collect further information concerning which neighbor should be chosen. Based on elaborate investigations of the dynamics generated by our model, we find that high levels of cooperation result from two kinds of behavior: cooperators tend to interact with cooperators to prevent being exploited by defectors and defectors tend to choose cooperators to exploit despite the possibility that some defectors convert to cooperators.. |
| 450. | 萩島理, 谷本潤, 池谷直樹, 藤原優也, 居住者の生活スケジュールの多様性を考慮した負荷計算に基づく省エネ行動の評価, 空気調和衛生後学会論文集, 205, 17-24, 2014.04. |
| 451. | Tanimoto, Jun, Assortative and dissortative priorities for game interaction and strategy adaptation significantly bolster network reciprocity in the prisoner's dilemma, Journal of Statistical Mechanics: Theory and Experiment, doi:10.1088/1742-5468/2014/05/P05003, P05003, 2014.04. |
| 452. | Sheikh Ahmad Zaki, Aya Hagishima, Jun Tanimoto, Ahmad Faiz Mohammad, Azli Abd Razak, Estimation of aerodynamic parameters of urban building arrays using wind tunnel measurements, Journal of Engineering Science and Technology, 9, 2, 176-190, 2014.04, The aim of this study is the experimental determination of a centre height of moment of drag force Hc, which is assumed to coincide with displacement height d on the basis of Jackson's theory. The authors performed a series of wind tunnel experiments on the spatial distribution of pressure drag acting on walls of rectangular block arrays arranged in staggered, square, and diamond layouts under the conditions of different roughness packing densities, i.e., 7.7%, 17.4%, 30.9%, and 39.1%. Total drag and wind profile of the arrays were preliminarily measured by a floating drag balance and a hot-wire anemometer, and roughness length zo and d were derived using two-parameter fitting in our previous work. Hc values determined by the pressure drag measurement were compared with d of our previous work. The results show that the estimated Hc values for staggered and square arrays are significantly smaller than d except for the data of lowest packing density. Moreover, the zo values estimated using one-parameter fitting and measured Hc are slightly larger than those of previous work for the three arrays with high packing density. Although inconsistencies of Hc and d exist, it is likely that Hc could be explained as d for a range of low packing densities, i.e., below 30.9%. The present results suggest the necessity of both more accurate data of spatially averaged wind profile and direct measurement of Hc for experimental determination of the roughness length and displacement height of a block array.. |
| 453. | Tanimoto、Jun, Simultaneously selecting appropriate partners for gaming and strategy adaptation to enhance network reciprocity in the prisoner's dilemma, Physical Review E, http://dx.doi.org/10.1103/PhysRevE.89.012106, 89, 012106, 2014.01. |
| 454. | Eriko Fukuda, Satoshi Kokubo, Jun Tanimoto, Zhen Wang, Aya Hagishima, Naoki Ikegaya, Risk assessment for infectious disease and its impact on voluntary vaccination behavior in social networks, Chaos, Solitons and Fractals, 10.1016/j.chaos.2014.07.004, 68, 1-9, 2014.01, [URL], Achievement of the herd immunity is essential for preventing the periodic spreading of an infectious disease such as the flu. If vaccination is voluntary, as vaccination coverage approaches the critical level required for herd immunity, there is less incentive for individuals to be vaccinated; this results in an increase in the number of so-called "free-riders" who craftily avoid infection via the herd immunity and avoid paying any cost. We use a framework originating in evolutionary game theory to investigate this type of social dilemma with respect to epidemiology and the decision of whether to be vaccinated. For each individual in a population, the decision on vaccination is associated with how one assesses the risk of infection. In this study, we propose a new risk-assessment model in a vaccination game when an individual updates her strategy, she compares her own payoff to a net payoff obtained by averaging a collective payoff over individuals who adopt the same strategy as that of a randomly selected neighbor. In previous studies of vaccination games, when an individual updates her strategy, she typically compares her payoff to the payoff of a randomly selected neighbor, indicating that the risk for changing her strategy is largely based on the behavior of one other individual, i.e., this is an individual-based risk assessment. However, in our proposed model, risk assessment by any individual is based on the collective success of a strategy and not on the behavior of any one other individual. For strategy adaptation, each individual always takes a survey of the degree of success of a certain strategy that one of her neighbors has adopted, i.e., this is a strategy-based risk assessment. Using computer simulations, we determine how these two different risk-assessment methods affect the spread of an infectious disease over a social network. The proposed model is found to benefit the population, depending on the structure of the social network and cost of vaccination. Our results suggest that individuals (or governments) should understand the structure of their social networks at the regional level, and accordingly, they should adopt an appropriate risk-assessment methodology as per the demands of the situation.. |
| 455. | Jun Tanimoto, Simultaneously selecting appropriate partners for gaming and strategy adaptation to enhance network reciprocity in the prisoner's dilemma, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.89.012106, 89, 1, 2014.01, [URL], Network reciprocity is one mechanism for adding social viscosity, which leads to cooperative equilibrium in 2 × 2 prisoner's dilemma games. Previous studies have shown that cooperation can be enhanced by using a skewed, rather than a random, selection of partners for either strategy adaptation or the gaming process. Here we show that combining both processes for selecting a gaming partner and an adaptation partner further enhances cooperation, provided that an appropriate selection rule and parameters are adopted. We also show that this combined model significantly enhances cooperation by reducing the degree of activity in the underlying network; we measure the degree of activity with a quantity called effective degree. More precisely, during the initial evolutionary stage in which the global cooperation fraction declines because initially allocated cooperators becoming defectors, the model shows that weak cooperative clusters perish and only a few strong cooperative clusters survive. This finding is the most important key to attaining significant network reciprocity.. |
| 456. | Jun Tanimoto, Simultaneously selecting appropriate partners for gaming and strategy adaptation to enhance network reciprocity in the prisoner's dilemma, PHYSICAL REVIEW E, 10.1103/PhysRevE.89.012106, 89, 1, 2014.01, Network reciprocity is one mechanism for adding social viscosity, which leads to cooperative equilibrium in 2 x 2 prisoner's dilemma games. Previous studies have shown that cooperation can be enhanced by using a skewed, rather than a random, selection of partners for either strategy adaptation or the gaming process. Here we show that combining both processes for selecting a gaming partner and an adaptation partner further enhances cooperation, provided that an appropriate selection rule and parameters are adopted. We also show that this combined model significantly enhances cooperation by reducing the degree of activity in the underlying network; we measure the degree of activity with a quantity called effective degree. More precisely, during the initial evolutionary stage in which the global cooperation fraction declines because initially allocated cooperators becoming defectors, the model shows that weak cooperative clusters perish and only a few strong cooperative clusters survive. This finding is the most important key to attaining significant network reciprocity.. |
| 457. | Naoki Ikegaya, Aya Hagishima, Jun Tanimoto, A consideration on the effects of drag force acting on roughness element - The relationship between drag coefficient and dissipation rate, Journal of Environmental Engineering (Japan), 10.3130/aije.79.297, 79, 697, 297-304, 2014, [URL], Momentum and energy budgets on an urban surface are investigated based on theoretical approach by deriving the budget equations. Firstly, we have introduced the integral equation for energy, which corresponds to the equation as known as Karman's integral law for momentum. These equations can explain the effect of drag force acting on roughness elements on the budgets of momentum and energy. Secondly, it is shown that the additional term appears to explain for the drag force to be able to directly absorb momentum provided out of boundary layer. Although the corresponding term does not exist in the energy budget equations, the drag force may work to increase the turbulence energy through the additional turbulence production terms. Thirdly, the relationship between drag coefficient and dissipation rate have been discussed. These quantities have positive correlation and can be an index to explain the wind velocity deficit.. |
| 458. | Jun Tanimoto, Assortative and dissortative priorities for game interaction and strategy adaptation significantly bolster network reciprocity in the prisoner's dilemma, Journal of Statistical Mechanics: Theory and Experiment, 10.1088/1742-5468/2014/05/P05003, 2014, 5, 2014, [URL], In 2 × 2 prisoner's dilemma games, network reciprocity is one mechanism for adding social viscosity, which leads to cooperative equilibrium. Here we show that combining the process for selecting a gaming partner with the process for selecting an adaptation partner significantly enhances cooperation, even though such selection processes require additional costs to collect further information concerning which neighbor should be chosen. Based on elaborate investigations of the dynamics generated by our model, we find that high levels of cooperation result from two kinds of behavior: cooperators tend to interact with cooperators to prevent being exploited by defectors and defectors tend to choose cooperators to exploit despite the possibility that some defectors convert to cooperators.. |
| 459. | Miyaji, Kohei, Tanimoto、Jun, Hagishima, Aya, Ikegaya, Naoki, Influence of stochastic perturbation of both action updating and strategy updating in mixed-strategy 2 times 2 games on evolution of cooperation, Physical Review E, http://link.aps.org/doi/10.1103/PhysRevE.88.062149, 88, 062149, 2013.12. |
| 460. | 小笠原崇, 谷本潤, 福田枝里子, 萩島理, 池谷直樹, 囚人のジレンマゲームにokジェルゲーム対戦隣人と戦略適応隣人の分離による協調創発機構の解明, 第19回交通流のシミュレーションシンポジウム, 101-104, 2013.12. |
| 461. | 岸本憲幸, 小窪聡, 谷本潤, 萩島理, 囚人のジレンマによる戦略適応範囲を拡大した切替戦略によるネットワーク互恵, 第19回交通流のシミュレーションシンポジウム, 97-100, 2013.12. |
| 462. | 谷本潤, 宮地浩平, 萩島理, 池谷直樹, ネットワーク上の同類的な繋がりの促進が囚人のジレンマゲームにおける協調進化に与える影響, 第19回交通流のシミュレーションシンポジウム, 93-96, 2013.12. |
| 463. | 中村光佑, 谷本潤, 萩島理, 池谷直樹, 藤木拓也, 茎田慎司, 経路選択問題に潜在する数理ジレンマ構造に関する研究, 第19回交通流のシミュレーションシンポジウム, 73-76, 2013.12. |
| 464. | 谷本潤, 藤木拓也, 萩島理, 池谷直樹, 茎田慎司, 非一様な粒子が混在した二車線系交通流における車線変更条件の提案と非対称性の再現, 第19回交通流のシミュレーションシンポジウム, 69-72, 2013.12. |
| 465. | 福田枝里子, 谷本潤, 萩島理, 池谷直樹, 感染症および情報伝達ネットワークの相違が自発的ワクチン接種行動に与える影響, 第19回交通流のシミュレーションシンポジウム, 57-60, 2013.12. |
| 466. | Kohei Miyaji, Jun Tanimoto, Aya Hagishima, Naoki Ikegaya, Influence of stochastic perturbation of both action updating and strategy updating in mixed-strategy 2 × 2 games on evolution of cooperation, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.88.062149, 88, 6, 2013.12, [URL], In a mixed-strategy game framework, each agent's strategy is defined by a real number; on the other hand, in a discrete strategy game framework, only binary strategies, either cooperation or defection, are allowed. In a spatial mixed-strategy game, with respect to the process for updating action (offer), either a synchronous or an asynchronous strategy update should be presumed. This study elucidates how stochastic perturbation that results from a synchronous or an asynchronous process for updating action significantly affects the enhancement of cooperation in an evolutionary process. Especially, when a synchronous process for updating action is assumed, the extent of cooperation increases with an increase in degree.. |
| 467. | Kohei Miyaji, Jun Tanimoto, Aya Hagishima, Naoki Ikegaya, Influence of stochastic perturbation of both action updating and strategy updating in mixed-strategy 2 x 2 games on evolution of cooperation, PHYSICAL REVIEW E, 10.1103/PhysRevE.88.062149, 88, 6, 2013.12, In a mixed-strategy game framework, each agent's strategy is defined by a real number on the other hand, in a discrete strategy game framework, only binary strategies, either cooperation or defection, are allowed. In a spatial mixed-strategy game, with respect to the process for updating action (offer), either a synchronous or an asynchronous strategy update should be presumed. This study elucidates how stochastic perturbation that results from a synchronous or an asynchronous process for updating action significantly affects the enhancement of cooperation in an evolutionary process. Especially, when a synchronous process for updating action is assumed, the extent of cooperation increases with an increase in degree. © 2013 American Physical Society.. |
| 468. | Miyaji, Kohei, Tanimoto, Jun, Wang, Zhen, Hagishima, Aya, Kokubo, Satoshi, The evolution of fairness in the coevolutionary ultimatum games, Chaos, Solitons & Fractals, http://dx.doi.org/10.1016/j.chaos.2013.05.007, 56, 13-18, 2013.11. |
| 469. | Kishimoto, Noriyuki, Kokubo, Satoshi, Tanimoto, Jun, Combination of continuous and binary strategies enhances network reciprocity in a spatial prisoner's dilemma game, Chaos, Solitons & Fractals, http://dx.doi.org/10.1016/j.chaos.2013.07.00, 56, 83-90, 2013.11. |
| 470. | Tanimoto、Jun, Shigaki, Keizo, Wang, Zhen, Fukuda, Eriko, Effect of initial fraction of cooperators on cooperative behavior in evolutionary prisoner's dilemma, PLOS One, http://dx.doi.org/10.1371/journal.pone.0076942, 8, 11, e76942, 2013.11. |
| 471. | Keizo Shigaki, Zhen Wang, Jun Tanimoto, Eriko Fukuda, Effect of initial fraction of cooperators on cooperative behavior in evolutionary prisoner's dilemma game, PLoS One, 10.1371/journal.pone.0076942, 8, 11, 2013.11, [URL], We investigate the influence of initial fraction of cooperators on the evolution of cooperation in spatial prisoner's dilemma games. Compared with the results of heterogeneous networks, we find that there is a relatively low initial fraction of cooperators to guarantee higher equilibrium cooperative level. While this interesting phenomenon is contrary to the commonly shared knowledge that higher initial fraction of cooperators can provide better environment for the evolution of cooperation. To support our outcome, we explore the time courses of cooperation and find that the whole course can be divided into two sequent stages: enduring (END) and expanding (EXP) periods. At the end of END period, thought there is a limited number of cooperator clusters left for the case of low initial setup, these clusters can smoothly expand to hold the whole system in the EXP period. However, for high initial fraction of cooperators, superfluous cooperator clusters hinder their effective expansion, which induces many remaining defectors surrounding the cooperator clusters. Moreover, through intensive analysis, we also demonstrate that when the tendency of three cooperation cluster characteristics (cluster size, cluster number and cluster shape) are consistent within END and EXP periods, the state that maximizes cooperation can be favored.. |
| 472. | Noriyuki Kishimoto, Satoshi Kokubo, Jun Tanimoto, Combination of continuous and binary strategies enhances network reciprocity in a spatial prisoner's dilemma game, CHAOS SOLITONS & FRACTALS, 10.1016/j.chaos.2013.07.009, 56, 83-90, 2013.11, For 2 x 2 games, especially the Spatial Prisoner's Dilemma (SPD), most previous studies have presumed that players can either cooperate (C) or defect (D); this is the so-called discrete strategy. In this paper, we define the continuous-binary strategy instead of the discrete strategy. A systematic series of numerical simulations reports that the continuous-binary strategy enhances the network reciprocity for SPD. This new strategy is based on our previous finding that continuous and mixed strategies shows more robust cooperation than discrete strategy does in boundary games of Chicken and PD (BCH) and Stag Hunt and PD (BSH), respectively. It allows us to combine the advantages of continuous and mixed strategies over the usual discrete strategy into one model. (C) 2013 Elsevier Ltd. All rights reserved.. |
| 473. | Keizo Shigaki, Zhen Wang, Jun Tanimoto, Eriko Fukuda, Effect of Initial Fraction of Cooperators on Cooperative Behavior in Evolutionary Prisoner's Dilemma Game, PLOS ONE, 10.1371/journal.pone.0076942, 8, 11, 2013.11, We investigate the influence of initial fraction of cooperators on the evolution of cooperation in spatial prisoner's dilemma games. Compared with the results of heterogeneous networks, we find that there is a relatively low initial fraction of cooperators to guarantee higher equilibrium cooperative level. While this interesting phenomenon is contrary to the commonly shared knowledge that higher initial fraction of cooperators can provide better environment for the evolution of cooperation. To support our outcome, we explore the time courses of cooperation and find that the whole course can be divided into two sequent stages: enduring (END) and expanding (EXP) periods. At the end of END period, thought there is a limited number of cooperator clusters left for the case of low initial setup, these clusters can smoothly expand to hold the whole system in the EXP period. However, for high initial fraction of cooperators, superfluous cooperator clusters hinder their effective expansion, which induces many remaining defectors surrounding the cooperator clusters. Moreover, through intensive analysis, we also demonstrate that when the tendency of three cooperation cluster characteristics (cluster size, cluster number and cluster shape) are consistent within END and EXP periods, the state that maximizes cooperation can be favored.. |
| 474. | Wang, Zhen, Kokubo, Satoshi, Tanimoto、Jun, Fukuda, Eriko, Shigaki, Keizo, Insight on the so-called spatial reciprocity, Physical Review E, http://dx.doi.org/10.1103/PhysRevE.88.042145, 88, 042145, 2013.10. |
| 475. | Zhen Wang, Satoshi Kokubo, Jun Tanimoto, Eriko Fukuda, Keizo Shigaki, Insight into the so-called spatial reciprocity, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.88.042145, 88, 4, 2013.10, [URL], Up to now, there have been a great number of studies that demonstrate the effect of spatial topology on the promotion of cooperation dynamics (namely, the so-called "spatial reciprocity"). However, most researchers probably attribute it to the positive assortment of strategies supported by spatial arrangement. In this paper, we analyze the time course of cooperation evolution under different evolution rules. Interestingly, a typical evolution process can be divided into two evident periods: the enduring (END) period and the expanding (EXP) period where the former features that cooperators try to endure defectors' invasion and the latter shows that perfect C clusters fast expand their area. We find that the final cooperation level relies on two key factors: the formation of the perfect C cluster at the end of the END period and the expanding fashion of the perfect C cluster during the EXP period. For deterministic rule, the smooth expansion of C cluster boundaries enables cooperators to reach a dominant state, whereas, the rough boundaries for stochastic rule cannot provide a sufficient beneficial environment for the evolution of cooperation. Moreover, we show that expansion of the perfect C cluster is closely related to the cluster coefficient of interaction topology. To some extent, we present a viable method for understanding the spatial reciprocity mechanism in nature and hope that it will inspire further studies to resolve social dilemmas.. |
| 476. | Zhen Wang, Satoshi Kokubo, Jun Tanimoto, Eriko Fukuda, Keizo Shigaki, Insight into the so-called spatial reciprocity, PHYSICAL REVIEW E, 10.1103/PhysRevE.88.042145, 88, 4, 2013.10, Up to now, there have been a great number of studies that demonstrate the effect of spatial topology on the promotion of cooperation dynamics (namely, the so-called " spatial reciprocity"). However, most researchers probably attribute it to the positive assortment of strategies supported by spatial arrangement. In this paper, we analyze the time course of cooperation evolution under different evolution rules. Interestingly, a typical evolution process can be divided into two evident periods: the enduring (END) period and the expanding (EXP) period where the former features that cooperators try to endure defectors' invasion and the latter shows that perfect C clusters fast expand their area. We find that the final cooperation level relies on two key factors: the formation of the perfect C cluster at the end of the END period and the expanding fashion of the perfect C cluster during the EXP period. For deterministic rule, the smooth expansion of C cluster boundaries enables cooperators to reach a dominant state, whereas, the rough boundaries for stochastic rule cannot provide a sufficient beneficial environment for the evolution of cooperation. Moreover, we show that expansion of the perfect C cluster is closely related to the cluster coefficient of interaction topology. To some extent, we present a viable method for understanding the spatial reciprocity mechanism in nature and hope that it will inspire further studies to resolve social dilemmas.. |
| 477. | 宮地浩平, 谷本潤, Hagishima, Aya, Ikegaya, Naoki, 記憶に基づいた確率的意志決定が協調行動に与える影響, JWEIN 2013, 71-77, 2013.09. |
| 478. | 福田枝里子, 谷本潤, Hagishima, Aya, Ikegaya, Naoki, 感染伝搬ネットワークと戦略相互作用ネットワークの相違が自発的ワクチン接種行動に及ぼす影響, JWEIN 2013, 65-70, 2013.09. |
| 479. | Miyaji, Kohei, Wang, Zhen, Tanimoto, Jun, Hagishima, Aya, Ikegaya, Naoki, Direct reciprocity in spatial populations enhances R-reciprocity as well as ST-Reciprocity, PLOS One, http://dx.doi.org/10.1371/journal.pone.0071961, 8, 8, e71961, 2013.08. |
| 480. | Mohamad Mohd Faizal1, Hagishima, Aya, Ikegaya, Naoki, Tanimoto, Jun, Wind-induced natural ventilation in typical single story terraced houses in Malaysia, Proc. of 13th Building Simulation 2013, 2013.08. |
| 481. | Hagishima, Aya, Tanimoto, Jun, Ikegaya, Naoki, Mitsuyasu, Seijirou, Stochastic characteristics of thermal load in a single dwelling in a residential building based on building energy simulation coupled with a sub-model for considering variation on behavior schedules of residents, Proc. of 13th Building Simulation 2013, 2013.08. |
| 482. | Noriyuki Kishimoto, Satoshi Kokubo, Jun Tanimoto, Combination of continuous and binary strategies enhances network reciprocity in a spatial prisoner's dilemma game, Chaos, Solitons and Fractals, 10.1016/j.chaos.2013.07.009, 56, 83-90, 2013.08, [URL], For 2 × 2 games, especially the Spatial Prisoner's Dilemma (SPD), most previous studies have presumed that players can either cooperate (C) or defect (D); this is the so-called discrete strategy. In this paper, we define the continuous-binary strategy instead of the discrete strategy. A systematic series of numerical simulations reports that the continuous-binary strategy enhances the network reciprocity for SPD. This new strategy is based on our previous finding that continuous and mixed strategies shows more robust cooperation than discrete strategy does in boundary games of Chicken and PD (BCH) and Stag Hunt and PD (BSH), respectively. It allows us to combine the advantages of continuous and mixed strategies over the usual discrete strategy into one model.. |
| 483. | Kohei Miyaji, Jun Tanimoto, Zhen Wang, Aya Hagishima, Naoki Ikegaya, Direct Reciprocity in Spatial Populations Enhances R-Reciprocity As Well As ST-Reciprocity, PLoS One, 10.1371/journal.pone.0071961, 8, 8, 2013.08, [URL], As is well-known, spatial reciprocity plays an important role in facilitating the emergence of cooperative traits, and the effect of direct reciprocity is also obvious for explaining the cooperation dynamics. However, how the combination of these two scenarios influences cooperation is still unclear. In the present work, we study the evolution of cooperation in 2×2 games via considering both spatial structured populations and direct reciprocity driven by the strategy with 1-memory length. Our results show that cooperation can be significantly facilitated on the whole parameter plane. For prisoner's dilemma game, cooperation dominates the system even at strong dilemma, where maximal social payoff is still realized. In this sense, R-reciprocity forms and it is robust to the extremely strong dilemma. Interestingly, when turning to chicken game, we find that ST-reciprocity is also guaranteed, through which social average payoff and cooperation is greatly enhanced. This reciprocity mechanism is supported by mean-field analysis and different interaction topologies. Thus, our study indicates that direct reciprocity in structured populations can be regarded as a more powerful factor for the sustainability of cooperation.. |
| 484. | Kohei Miyaji, Jun Tanimoto, Zhen Wang, Aya Hagishima, Naoki Ikegaya, Direct Reciprocity in Spatial Populations Enhances R-Reciprocity As Well As ST-Reciprocity, PLOS ONE, 10.1371/journal.pone.0071961, 8, 8, 2013.08, As is well-known, spatial reciprocity plays an important role in facilitating the emergence of cooperative traits, and the effect of direct reciprocity is also obvious for explaining the cooperation dynamics. However, how the combination of these two scenarios influences cooperation is still unclear. In the present work, we study the evolution of cooperation in 262 games via considering both spatial structured populations and direct reciprocity driven by the strategy with 1-memory length. Our results show that cooperation can be significantly facilitated on the whole parameter plane. For prisoner's dilemma game, cooperation dominates the system even at strong dilemma, where maximal social payoff is still realized. In this sense, R-reciprocity forms and it is robust to the extremely strong dilemma. Interestingly, when turning to chicken game, we find that ST-reciprocity is also guaranteed, through which social average payoff and cooperation is greatly enhanced. This reciprocity mechanism is supported by mean-field analysis and different interaction topologies. Thus, our study indicates that direct reciprocity in structured populations can be regarded as a more powerful factor for the sustainability of cooperation.. |
| 485. | Tanimoto, Jun, Co-evolutionary, coexisting learning and teaching agents model for prisoner's dilemma games enhancing cooperation with assortative heterogeneous networks, Physica A, http://dx.doi.org/10.1016/j.physa.2013.02.004, 392, 13, 2955-2964, 2013.07, [URL]. |
| 486. | Jun Tanimoto, Coevolutionary, coexisting learning and teaching agents model for prisoner's dilemma games enhancing cooperation with assortative heterogeneous networks, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2013.02.004, 392, 13, 2955-2964, 2013.07, [URL], Unlike other natural network systems, assortativity can be observed in most human social networks, although it has been reported that a social dilemma situation represented by the prisoner's dilemma favors dissortativity to enhance cooperation. We established a new coevolutionary model for both agents' strategy and network topology, where teaching and learning agents coexist. Remarkably, this model enables agents' enhancing cooperation more than a learners-only model on a time-frozen scale-free network and produces an underlying assortative network with a fair degree of power-law distribution. The model may imply how and why assortative networks are adaptive in human society.. |
| 487. | Kohei Miyaji, Zhen Wang, Jun Tanimoto, Aya Hagishima, Satoshi Kokubo, The evolution of fairness in the coevolutionary ultimatum games, Chaos, Solitons and Fractals, 10.1016/j.chaos.2013.05.007, 56, 13-18, 2013.07, [URL], In the ultimatum games, two players are required to split a certain sum of money. Through the responder accepting the offer of proposer, the money will be shared and the fairness is built finally. Here, we figure out five coevolutionary protocols, where strategy (offering rate p and threshold for accepting an offer q) and underlying network topology can coevolve, to demonstrate how the link severing scenario affects the evolution of fairness. We show that the equilibrium of the games is significantly influenced by these coevolutionary protocols. The deterministic rules lead to overly lavish or overly generous result that is inconsistent with the outcome of human behavior experiment. However, the probabilistic rules produce fair division, similar to the realistic case. Moreover, we also introduce an amplitude parameter b to verify the plausibility of assumed link severing protocols. By means of enhancing b we analytically exhibit that preferable performance can be obtained in the game, since the total amount of agents increases as well. Last, we further support our conclusion by showing the so-called unrealistic severing events under these coevolution scenarios. We thus present a viable way of understanding the ubiquitous fairness in nature and hope that it will inspire further studies to resolve social division.. |
| 488. | Jun Tanimoto, Coevolutionary, coexisting learning and teaching agents model for prisoner's dilemma games enhancing cooperation with assortative heterogeneous networks, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2013.02.004, 392, 13, 2955-2964, 2013.07, Unlike other natural network systems, assortativity can be observed in most human social networks, although it has been reported that a social dilemma situation represented by the prisoner's dilemma favors dissortativity to enhance cooperation. We established a new coevolutionary model for both agents' strategy and network topology, where teaching and learning agents coexist. Remarkably, this model enables agents' enhancing cooperation more than a learners-only model on a time-frozen scale-free network and produces an underlying assortative network with a fair degree of power-law distribution. The model may imply how and why assortative networks are adaptive in human society. (C) 2013 Elsevier B.V. All rights reserved.. |
| 489. | Sato, Tsuyoshi, Hagishima, Aya, Ikegaya, Naoki, Tanimoto, Jun, Particle image velocimetry measurement of unsteady turbulent flow around regularly arranged high-rise building models, International Journal of High-Rise Buildings, 2, 2, 105-113, 2013.06. |
| 490. | Tanimoto, Jun, Difference of reciprocity effect in two coevolutionary models of presumed two-player and multi-player games, Physical Review E, http://link.aps.org/doi/10.1103/PhysRevE.87.062136, 87, 6, 062136, 2013.06. |
| 491. | Jun Tanimoto, Difference of reciprocity effect in two coevolutionary models of presumed two-player and multiplayer games, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.87.062136, 87, 6, 2013.06, [URL], Unlike other natural network systems, assortativity can be observed in most human social networks; however, it has been reported that a social dilemma situation represented by a 2×2 prisoner's dilemma game favors dissortativity to enhance cooperation. Our simulations successfully reveal that a public goods game with coevolution for both agents' strategy and network topology encourages assortativity, although it only slightly enhances cooperation as compared to a 2×2 donor and recipient game with a strong dilemma to be solved. This outcome occurs because the network dynamics in a multiplayer game discourages emerging cooperation unlike its beneficial result in a 2×2 prisoner's dilemma game.. |
| 492. | Jun Tanimoto, Difference of reciprocity effect in two coevolutionary models of presumed two-player and multiplayer games, PHYSICAL REVIEW E, 10.1103/PhysRevE.87.062136, 87, 6, 2013.06, Unlike other natural network systems, assortativity can be observed in most human social networks; however, it has been reported that a social dilemma situation represented by a 2x2 prisoner's dilemma game favors dissortativity to enhance cooperation. Our simulations successfully reveal that a public goods game with coevolution for both agents' strategy and network topology encourages assortativity, although it only slightly enhances cooperation as compared to a 2x2 donor and recipient game with a strong dilemma to be solved. This outcome occurs because the network dynamics in a multiplayer game discourages emerging cooperation unlike its beneficial result in a 2x2 prisoner's dilemma game.. |
| 493. | Minsun Park, Aya Hagishima, Jun Tanimoto, Chungyoon Chun, Willingness to pay for improvements in environmental performance of residential buildings, Building and Environment, 10.1016/j.buildenv.2012.10.017, 60, 225-233, 2013.02, [URL], The aim of this study is to determine preferences for the environmental factors of residential buildings by using two different methods: the conjoint analysis and ranking method. We tried to identify consumers' monetary value regarding environmental performance by testing their Marginal Willing to Pay (MWTP). A survey was conducted in Seoul, Korea to clarify the preference and monetary value of four selected attributes representing environmental performance. These attributes are reduction of energy bills, reduction of CO2 emissions, reduction of volatile organic compound emissions, and application of information technology facilities. The result can be summarized as follows. The MWTP for 1% reduction of CO2 emission is estimated about $377 USD, being 2 times higher than that for reduction of VOC emissions and almost same as that for the reduction of energy bills. The energy bill is most preferred and IT facilities are least preferred in ranking method. Preferences vary according to respondents' socio-demographic factors and the numerical information in conjoint analysis makes strongly reflect them.. |
| 494. | Minsun Park, Aya Hagishima, Jun Tanimoto, Chungyoon Chun, Willingness to pay for improvements in environmental performance of residential buildings, BUILDING AND ENVIRONMENT, 10.1016/j.buildenv.2012.10.017, 60, 225-233, 2013.02, The aim of this study is to determine preferences for the environmental factors of residential buildings by using two different methods: the conjoint analysis and ranking method. We tried to identify consumers' monetary value regarding environmental performance by testing their Marginal Willing to Pay (MWTP). A survey was conducted in Seoul, Korea to clarify the preference and monetary value of four selected attributes representing environmental performance. These attributes are reduction of energy bills, reduction of CO2 emissions, reduction of volatile organic compound emissions, and application of information technology facilities. The result can be summarized as follows. The MWTP for 1% reduction of CO2 emission is estimated about $377 USD, being 2 times higher than that for reduction of VOC emissions and almost same as that for the reduction of energy bills. The energy bill is most preferred and IT facilities are least preferred in ranking method. Preferences vary according to respondents' socio-demographic factors and the numerical information in conjoint analysis makes strongly reflect them. (c) 2012 Elsevier Ltd. All rights reserved.. |
| 495. | Azli Abd Razak, Aya Hagishima, Naoki Ikegaya, Jun Tanimoto, Analysis of airflow over building arrays for assessment of urban wind environment, Building and Environment, 10.1016/j.buildenv.2012.08.007, 59, 56-65, 2013.01, [URL], Large eddy simulation (LES) of the airflows around various types of block arrays was performed to estimate the pedestrian wind environment. Five types of uniform staggered block arrays with different aspect ratios and an array with a nonuniform height were selected for the simulations. The simulation accuracy was validated by comparing the drag coefficient and wind profiles with those of previous work. The characteristics of the spatially averaged mean wind profiles of the arrays were analyzed on the basis of the calculation results. This study reveals that the frontal area ratio, which is the product of the plan area ratio and building aspect ratio, is the most important parameter in estimating the pedestrian wind environment. In addition, a simple exponential equation was derived for predicting the pedestrian wind speed as a function of the frontal area ratio, which is applicable to various building aspect ratios and amounts of height variability.. |
| 496. | Azli Abd Razak, Aya Hagishima, Naoki Ikegaya, Jun Tanimoto, Analysis of airflow over building arrays for assessment of urban wind environment, BUILDING AND ENVIRONMENT, 10.1016/j.buildenv.2012.08.007, 59, 56-65, 2013.01, Large eddy simulation (LES) of the airflows around various types of block arrays was performed to estimate the pedestrian wind environment. Five types of uniform staggered block arrays with different aspect ratios and an array with a nonuniform height were selected for the simulations. The simulation accuracy was validated by comparing the drag coefficient and wind profiles with those of previous work. The characteristics of the spatially averaged mean wind profiles of the arrays were analyzed on the basis of the calculation results. This study reveals that the frontal area ratio, which is the product of the plan area ratio and building aspect ratio, is the most important parameter in estimating the pedestrian wind environment. In addition, a simple exponential equation was derived for predicting the pedestrian wind speed as a function of the frontal area ratio, which is applicable to various building aspect ratios and amounts of height variability. (c) 2012 Elsevier Ltd. All rights reserved.. |
| 497. | Aya Hagishima, Jun Tanimoto, Naoki Ikegaya, Seijiro Mitsuyasu, Stochastic characteristics of thermal load in a single dwelling in a residential building based on building energy simulation coupled with a sub-model for considering variation in behavior schedules of residents, 13th Conference of the International Building Performance Simulation Association, BS 2013 Proceedings of BS 2013: 13th Conference of the International Building Performance Simulation Association, 1446-1450, 2013, The stochastic characteristics of the heating/cooling load of a dwelling in a residential building were investigated using time-series data estimated by Total Utility Demand Prediction System TUD-PS which can predict utility demand such as air-conditioning loads considering the time-varying behavior schedule of residents. The simulation results for 16 cases of different conditions of family type and dwelling indicates the universality of the probability density functions of heating/cooling load.. |
| 498. | 福田枝里子，小窪聡，谷本潤，萩島理，池谷直樹, 感染症に対するリスク評価が社会ネットワーク上における自発的ワクチン接種行動に及ぼす影響, 第18回交通流のシミュレーションシンポジウム, 29-32, 2012.12. |
| 499. | 藤木拓也，谷本潤，萩島理，池谷直樹, 交通流における2体ダイナミクスを考慮した車線変更CAもデルの開発, 第18回交通流のシミュレーションシンポジウム, 25-28, 2012.12. |
| 500. | 志垣圭蔵，谷本潤，Zhen Wang, 萩島理，池谷直樹, 社会平均を考慮したPairwise-Fermi戦略更新を適用したPublic Goods Gameにおけるネットワーク互恵, 第18回交通流のシミュレーションシンポジウム, 21-24, 2012.12. |
| 501. | Shigaki,K., Tanimoto,J., Wang,Z., Hagishima,A, Ikegaya,N, A new Pairwise Fermi update rule, not referring to randomly selected opponent's payoff but social average payoff of same strategy the opponent has, significantly enhances cooperation in spatial prisoner's dilemma games, Physical Review E, http://link.aps.org/doi/10.1103/PhysRevE.86.031141, 86, 031141, 2012.11. |
| 502. | 池谷直樹，萩島理，谷本潤，田中雄大, 複雑都市形状を対象としたスカラー濃度プロファイル測定に基づく運動量･スカラー粗度相似性の検証, 日本建築学会環境系論文集 , 77, 681, 917-923, 2012.11. |
| 503. | Kishimoto,N., Kokubo,S., Tanimoto,J., Network reciprocity on spatial prisoner’s dilemma games by continuous-binary strategy, Proc. of 6th International Conference on Soft Computing and Intelligent Systems, and 13th International Symposium on Advanced Intelligent Systems (SCIS-ISIS 2012), 2012.11. |
| 504. | Nik Ibrahim,I., Ikegaya,N., Hagishima,A., Tanimoto,J., A study on the similarity between scalar and momentum roughness lengths based on the scalar concentration measurement, Proc. of 1st Asia Conference of International Building Performance Simulation Association (ASim2012), 2012.11. |
| 505. | Naoki Ikegaya, Aya Hagishima, Jun Tanimoto, Yu Dai Tanaka, A study on the similarity of the momentum and scalar roughness lengths over urban-like roughness, Journal of Environmental Engineering (Japan), 10.3130/aije.77.917, 77, 681, 917-923, 2012.11, [URL], We have performed a series of wind-tunnel experiments to measure scalar concentration profiles over urban-like roughness arrays. The concentration measurements revealed two features of scalar distribution. First, the high concentration filed was observed in the leeward region of each roughness element. Secondly, the averaged concentration became high up to the roughness height due to the updraft along the element and the boundary layer thickness drastically reach to the height in spite of the short length of scalar source area. In addition to the concentration measurements, we determined the roughness length of scalar based on the preliminary performed comprehensive study on scalar transfer coefficients, momentum transfer coefficients and wind profiles and discussed the similarity between momentum and scalar transfer phenomena by applying the relation between the Dalton number and the roughness Reynolds number.. |
| 506. | Minsun Park, Aya Hagishima, Jun Tanimoto, Ken ichi Narita, Effect of urban vegetation on outdoor thermal environment Field measurement at a scale model site, Building and Environment, 10.1016/j.buildenv.2012.02.015, 56, 38-46, 2012.10, [URL], The goal of this research is to bridge the gap between numerical studies and field measurements on thermal environment of a real urban street and to present information on the effects of urban vegetation suitable for use by designers and planners. Outdoor measurements were conducted at a scale model site consisting of an array of concrete cubes each 1.5 m high. Eight urban street units with various vegetation conditions were reproduced to examine the quantitative effects of vegetation along the sidewalk and in median strips on the thermal environment in summer. The results can be summarized as follows. The presence of four sidewalk trees reduces the wind speed inside the canopy by up to 51%. Trees along the sidewalk also decrease the globe temperature; the reduction is attributed mainly to the decrease in radiation flux resulting from the shade they cast. Moreover, thermal mitigation due to vegetation persists even when an area is shaded. In contrast, the mitigating effect of a vegetated median strip is not remarkable. A sidewalk facing a southwestern wall exhibited the most significant thermal mitigation.. |
| 507. | Minsun Park, Aya Hagishima, Jun Tanimoto, Ken-ichi Narita, Effect of urban vegetation on outdoor thermal environment: Field measurement at a scale model site, BUILDING AND ENVIRONMENT, 10.1016/j.buildenv.2012.02.015, 56, 38-46, 2012.10, The goal of this research is to bridge the gap between numerical studies and field measurements on thermal environment of a real urban street and to present information on the effects of urban vegetation suitable for use by designers and planners. Outdoor measurements were conducted at a scale model site consisting of an array of concrete cubes each 1.5 m high. Eight urban street units with various vegetation conditions were reproduced to examine the quantitative effects of vegetation along the sidewalk and in median strips on the thermal environment in summer. The results can be summarized as follows. The presence of four sidewalk trees reduces the wind speed inside the canopy by up to 51%. Trees along the sidewalk also decrease the globe temperature: the reduction is attributed mainly to the decrease in radiation flux resulting from the shade they cast. Moreover, thermal mitigation due to vegetation persists even when an area is shaded. In contrast, the mitigating effect of a vegetated median strip is not remarkable. A sidewalk facing a southwestern wall exhibited the most significant thermal mitigation. (C) 2012 Elsevier Ltd. All rights reserved.. |
| 508. | Keizo Shigaki, Jun Tanimoto, Zhen Wang, Satoshi Kokubo, Aya Hagishima, Naoki Ikegaya, Referring to the social performance promotes cooperation in spatial prisoner's dilemma games, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.86.031141, 86, 3, 2012.09, [URL], We propose a new pairwise Fermi updating rule by considering a social average payoff when an agent copies a neighbor's strategy. In the update rule, a focal agent compares her payoff with the social average payoff of the same strategy that her pairwise opponent has. This concept might be justified by the fact that people reference global and, somehow, statistical information, not local information when imitating social behaviors. We presume several possible ways for the social average. Simulation results prove that the social average of some limited agents realizes more significant cooperation than that of the entire population.. |
| 509. | Keizo Shigaki, Jun Tanimoto, Zhen Wang, Satoshi Kokubo, Aya Hagishima, Naoki Ikegaya, Referring to the social performance promotes cooperation in spatial prisoner's dilemma games, PHYSICAL REVIEW E, 10.1103/PhysRevE.86.031141, 86, 3, 2012.09, We propose a new pairwise Fermi updating rule by considering a social average payoff when an agent copies a neighbor's strategy. In the update rule, a focal agent compares her payoff with the social average payoff of the same strategy that her pairwise opponent has. This concept might be justified by the fact that people reference global and, somehow, statistical information, not local information when imitating social behaviors. We presume several possible ways for the social average. Simulation results prove that the social average of some limited agents realizes more significant cooperation than that of the entire population.. |
| 510. | Park,M., Hagishima,A., Tanimoto,J., Effect of urban vegetation on outdoor thermal environment filed measurement at a scale model site, Building and Environment, 2012.08. |
| 511. | Tanimoto,J., Brede,M., Yamauchi,A., Network reciprocity by coexisting learning and teaching strategies, Physical Review E, 85, 2012.08. |
| 512. | 萩島理，谷本潤，池谷直樹，光安清次郎, 生活スケジュールの多様性を考慮した負荷計算に基づく集合住宅の熱負荷の確率密度関数, 空気調和･衛生工学会論文集, 184, 11-17, 2012.07. |
| 513. | 萩島理，パクミンソン，谷本潤, 集合住宅の環境性能に対する先行構造に関するアンケート調査, 日本建築学会環境系論文集 , 77, 676, 523-531, 2012.06. |
| 514. | Aya Hagishima, Minsun Park, Jun Tanimoto, Questionnaire survey on preference of environmental factors of residential buildings, Journal of Environmental Engineering (Japan), 10.3130/aije.77.523, 77, 676, 523-531, 2012.06, [URL], This paper reported a questionnaire survey on consumers' preference for several attributes of a condominium unit carried out in Kanagawa, Japan. The questionnaire were designed based on paired comparison conjoint theory, analytical hierarchy process (AHP), and rank method to quantify the preference for floor area. specifications of low C02 emission and VOC emission, and information technology (IT) facility. The responses of stated preference on paired comparison were analyzed based on both multi-logit and multi-probit methods. The result suggests the effectiveness of an inter-comparison among several types of probability model for evaluating the estimated willingness to pay for a group of small sample size.. |
| 515. | K. Shigaki, S. Kokubo, Jun Tanimoto, Aya Hagishima, Naoki Ikegaya, Does copy-resistance enhance cooperation in spatial prisoner's dilemma?, Europhysics Letters, 10.1209/0295-5075/98/40008, 98, 4, 2012.05, [URL], We propose a novel idea for the so-called pairwise-Fermi process by considering copy-resistance when an agent copies a neighbor's strategy, which implies that the focal agent with relatively affluent payoff vis-à-vis social average might be negative to copy her neighbor's strategy even if her payoff is less than the neighbor's payoff. Simulation results reveal that this idea with a revised strategy adaptation process significantly enhances cooperation for prisoner's dilemma games played on time-constant networks.. |
| 516. | Naoki Ikegaya, Aya Hagishima, Jun Tanimoto, Yudai Tanaka, Ken Ichi Narita, Sheikh Ahmad Zaki, Geometric Dependence of the Scalar Transfer Efficiency over Rough Surfaces, Boundary-Layer Meteorology, 10.1007/s10546-012-9698-5, 143, 2, 357-377, 2012.05, [URL], We performed a series of wind-tunnel experiments under neutral conditions in order to create a comprehensive database of scalar transfer coefficients for street surfaces using regular block arrays representing an urban environment. The objective is to clarify the geometric dependence of scalar transfer phenomena on rough surfaces. In addition, the datasets we have obtained are necessary to improve the modelling of scalar transfer used for computational simulations of urban environments; further, we can validate the results obtained by numerical simulations. We estimated the scalar transfer coefficients using the salinity method. The various configurations of the block arrays were designed to be similar to those used in a previous experiment to determine the total drag force acting on arrays. Our results are summarized as follows: first, the results for cubical arrays showed that the transfer coefficients for staggered and square layouts varied with the roughness packing density. The results for the staggered layout showed the possibility that the mixing effect of air can be enhanced for the mid-range values of the packing density. Secondly, the transfer coefficients for arrays with blocks of non-uniform heights were smaller than those for arrays with blocks of uniform height under conditions of low packing density; however, as the packing density increased, the opposite tendency was observed. Thirdly, the randomness of rotation angles of the blocks in the array led to increasing values of the transfer coefficients under sparse packing density conditions when compared with those for cubical arrays.. |
| 517. | Naoki Ikegaya, Aya Hagishima, Jun Tanimoto, Yudai Tanaka, Ken-ichi Narita, Sheikh Ahmad Zaki, Geometric Dependence of the Scalar Transfer Efficiency over Rough Surfaces, BOUNDARY-LAYER METEOROLOGY, 10.1007/s10546-012-9698-5, 143, 2, 357-377, 2012.05, We performed a series of wind-tunnel experiments under neutral conditions in order to create a comprehensive database of scalar transfer coefficients for street surfaces using regular block arrays representing an urban environment. The objective is to clarify the geometric dependence of scalar transfer phenomena on rough surfaces. In addition, the datasets we have obtained are necessary to improve the modelling of scalar transfer used for computational simulations of urban environments; further, we can validate the results obtained by numerical simulations. We estimated the scalar transfer coefficients using the salinity method. The various configurations of the block arrays were designed to be similar to those used in a previous experiment to determine the total drag force acting on arrays. Our results are summarized as follows: first, the results for cubical arrays showed that the transfer coefficients for staggered and square layouts varied with the roughness packing density. The results for the staggered layout showed the possibility that the mixing effect of air can be enhanced for the mid-range values of the packing density. Secondly, the transfer coefficients for arrays with blocks of non-uniform heights were smaller than those for arrays with blocks of uniform height under conditions of low packing density; however, as the packing density increased, the opposite tendency was observed. Thirdly, the randomness of rotation angles of the blocks in the array led to increasing values of the transfer coefficients under sparse packing density conditions when compared with those for cubical arrays.. |
| 518. | Tanimoto,J., Hagishima,A., Iwai,T., Ikegaya,N., Total utility demand prediction for multi-dwelling sites by a bottom-up approach considering variations of inhabitants’ behavior schedules, Journal of Building Performance Simulation, 2012.04. |
| 519. | Shigaki,K, Kokubo,S., Tanimoto,J., Hagishima,A, Ikegaya,N;, Does copy-resistance enhance cooperation in spatial prisoner’s dilemma?, EPL, 2012.04. |
| 520. | Sheikh Ahmad Zaki, Aya Hagishima, Jun Tanimoto, Experimental study of wind-induced ventilation in urban building of cube arrays with various layouts, Journal of Industrial Aerodynamics, 10.1016/j.jweia.2012.02.008, 103, 31-40, 2012.04, [URL], Urban airflow and dispersion processes have become matters of great concern from the viewpoints of urban heat island phenomena, thermal comfort of pedestrians, hazard control for toxic gases, wind-induced ventilation of urban buildings, and so on. In this study, the authors measured the spatial distribution of the pressure drag acting on the walls of rectangular block arrays in a wind tunnel. The arrays were arranged with staggered, square, and diamond layouts under different conditions of roughness and packing density. The total drag and wind profiles of the arrays were preliminarily measured. On the basis of experimental results, the contribution of pressure drag to the total surface drag on staggered cube arrays was estimated at greater than 95%. In addition, the bulk pressure coefficients C p for the arrays defined by mean velocity at a height of H, 2H and 20H were derived (H refers to the height of a block), and the clear relation between C p and the block packing densities were shown for rough estimation of wind-induced ventilation in urban buildings. In addition, the authors present a simple mathematical expression to explain the relationship.. |
| 521. | Sheikh Ahmad Zaki, Aya Hagishima, Jun Tanimoto, Experimental study of wind-induced ventilation in urban building of cube arrays with various layouts, JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, 10.1016/j.jweia.2012.02.008, 103, 31-40, 2012.04, Urban airflow and dispersion processes have become matters of great concern from the viewpoints of urban heat island phenomena, thermal comfort of pedestrians, hazard control for toxic gases, wind-induced ventilation of urban buildings, and so on. In this study, the authors measured the spatial distribution of the pressure drag acting on the walls of rectangular block arrays in a wind tunnel. The arrays were arranged with staggered, square, and diamond layouts under different conditions of roughness and packing density. The total drag and wind profiles of the arrays were preliminarily measured. On the basis of experimental results, the contribution of pressure drag to the total surface drag on staggered cube arrays was estimated at greater than 95%. In addition, the bulk pressure coefficients C-p for the arrays defined by mean velocity at a height of H, 2H and 20H were derived (H refers to the height of a block), and the clear relation between C-p and the block packing densities were shown for rough estimation of wind-induced ventilation in urban buildings. In addition, the authors present a simple mathematical expression to explain the relationship. (C) 2012 Elsevier Ltd. All rights reserved.. |
| 522. | Jun Tanimoto, Markus Brede, Atsuo Yamauchi, Network reciprocity by coexisting learning and teaching strategies, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.85.032101, 85, 3, 2012.03, [URL], We propose a network reciprocity model in which an agent probabilistically adopts learning or teaching strategies. In the learning adaptation mechanism, an agent may copy a neighbor's strategy through Fermi pairwise comparison. The teaching adaptation mechanism involves an agent imposing its strategy on a neighbor. Our simulations reveal that the reciprocity is significantly affected by the frequency with which learning and teaching agents coexist in a network and by the structure of the network itself.. |
| 523. | Jun Tanimoto, Markus Brede, Atsuo Yamauchi, Network reciprocity by coexisting learning and teaching strategies, PHYSICAL REVIEW E, 10.1103/PhysRevE.85.032101, 85, 3, 2012.03, We propose a network reciprocity model in which an agent probabilistically adopts learning or teaching strategies. In the learning adaptation mechanism, an agent may copy a neighbor's strategy through Fermi pairwise comparison. The teaching adaptation mechanism involves an agent imposing its strategy on a neighbor. Our simulations reveal that the reciprocity is significantly affected by the frequency with which learning and teaching agents coexist in a network and by the structure of the network itself.. |
| 524. | Weicai Zhong, Satoshi Kokubo, Jun Tanimoto, How is the equilibrium of continuous strategy game different from that of discrete strategy game?, BioSystems, 10.1016/j.biosystems.2011.10.001, 107, 2, 88-94, 2012.02, [URL], Cooperation in the prisoner's dilemma (PD) played on various networks has been explained by so-called network reciprocity. Most of the previous studies presumed that players can offer either cooperation (C) or defection (D). This discrete strategy seems unrealistic in the real world, since actual provisions might not be discrete, but rather continuous. This paper studies the differences between continuous and discrete strategies in two aspects under the condition that the payoff function of the former is a linear interpolation of the payoff matrix of the latter. The first part of this paper proves theoretically that for two-player games, continuous and discrete strategies have different equilibria and game dynamics in a well-mixed but finite population. The second part, conducting a series of numerical experiments, reveals that such differences become considerably large in the case of PD games on networks. Furthermore, it shows, using the Wilcoxon sign-rank test, that continuous and discrete strategy games are statistically significantly different in terms of equilibria. Intensive discussion by comparing these two kinds of games elucidates that describing a strategy as a real number blunts D strategy invasion to C clusters on a network in the early stage of evolution. Thus, network reciprocity is enhanced by the continuous strategy.. |
| 525. | Jun Tanimoto, Makoto Nakata, Aya Hagishima, Naoki Ikegaya, Spatially correlated heterogeneous aspirations to enhance network reciprocity, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2011.08.039, 391, 3, 680-685, 2012.02, [URL], Perc & Wang demonstrated that aspiring to be the fittest under conditions of pairwise strategy updating enhances network reciprocity in structured populations playing 2×2 Prisoner's Dilemma games (Z. Wang, M. Perc, Aspiring to the fittest and promoted of cooperation in the Prisoner's Dilemma game, Physical Review E 82 (2010) 021115; M. Perc, Z. Wang, Heterogeneous aspiration promotes cooperation in the Prisoner's Dilemma game, PLOS one 5 (12) (2010) e15117). Through numerical simulations, this paper shows that network reciprocity is even greater if heterogeneous aspirations are imposed. We also suggest why heterogeneous aspiration fosters network reciprocity. It distributes strategy updating speed among agents in a manner that fortifies the initially allocated cooperators' clusters against invasion. This finding prompted us to further enhance the usual heterogeneous aspiration cases for heterogeneous network topologies. We find that a negative correlation between degree and aspiration level does extend cooperation among heterogeneously structured agents.. |
| 526. | Weicai Zhong, Satoshi Kokubo, Jun Tanimoto, How is the equilibrium of continuous strategy game different from that of discrete strategy game?, BIOSYSTEMS, 10.1016/j.biosystems.2011.10.001, 107, 2, 88-94, 2012.02, Cooperation in the prisoner's dilemma (PD) played on various networks has been explained by so-called network reciprocity. Most of the previous studies presumed that players can offer either cooperation (C) or defection (D). This discrete strategy seems unrealistic in the real world, since actual provisions might not be discrete, but rather continuous. This paper studies the differences between continuous and discrete strategies in two aspects under the condition that the payoff function of the former is a linear interpolation of the payoff matrix of the latter. The first part of this paper proves theoretically that for two-player games, continuous and discrete strategies have different equilibria and game dynamics in a well-mixed but finite population. The second part, conducting a series of numerical experiments, reveals that such differences become considerably large in the case of PD games on networks. Furthermore, it shows, using the Wilcoxon sign-rank test, that continuous and discrete strategy games are statistically significantly different in terms of equilibria. Intensive discussion by comparing these two kinds of games elucidates that describing a strategy as a real number blunts D strategy invasion to C clusters on a network in the early stage of evolution. Thus, network reciprocity is enhanced by the continuous strategy. (C) 2011 Elsevier Ireland Ltd. All rights reserved.. |
| 527. | Jun Tanimoto, Makoto Nakata, Aya Hagishima, Naoki Ikegaya, Spatially correlated heterogeneous aspirations to enhance network reciprocity, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2011.08.039, 391, 3, 680-685, 2012.02, Perc & Wang demonstrated that aspiring to be the fittest under conditions of pairwise strategy updating enhances network reciprocity in structured populations playing 2 x 2 Prisoner's Dilemma games (Z. Wang, M. Perc, Aspiring to the fittest and promoted of cooperation in the Prisoner's Dilemma game, Physical Review E 82 (2010) 021115; M. Perc, Z. Wang, Heterogeneous aspiration promotes cooperation in the Prisoner's Dilemma game, PLOS one 5 (12) (2010) e15117). Through numerical simulations, this paper shows that network reciprocity is even greater if heterogeneous aspirations are imposed. We also suggest why heterogeneous aspiration fosters network reciprocity. It distributes strategy updating speed among agents in a manner that fortifies the initially allocated cooperators' clusters against invasion. This finding prompted us to further enhance the usual heterogeneous aspiration cases for heterogeneous network topologies. We find that a negative correlation between degree and aspiration level does extend cooperation among heterogeneously structured agents. (C) 2011 Elsevier B.V. All rights reserved.. |
| 528. | Zhong,W., Kokubo,S., Tanimoto,J., How is the equilibrium of continuous strategy game different from that of discrete strategy game?, BioSystems , http://dx.doi.org/10.1016/j.biosystems.2011.10.001, 107 (2), 89-94, 2012.01. |
| 529. | Ikegaya,N., Hagishima,A., Tanimoto,J., Tanaka,Y., Narita,K. Sheikh Ahmad,Z., Geometric Dependence of the Scalar Transfer Efficiency over Rough Surfaces, Boundary-Layer Metrology , 142 (2),, 2012.01, [URL]. |
| 530. | Sheikh,A.Z., Hagishima,A., Tanimoto,J., Experimental study of wind-induced ventilation in urban building of cube arrays with various layouts, Journal of Wind Engineering & Industrial Aerodynamics , http://dx.doi.org/10.1016/j.jweia.2012.02.008, 103, 31-40, 2012., 2012.01. |
| 531. | Jun Tanimoto, Aya Hagishima, State transition stochastic model for predicting off to on cooling schedule in dwellings as implemented using a multilayered artificial neural network, Journal of Building Performance Simulation, 10.1080/19401493.2010.533388, 5, 1, 45-53, 2012.01, [URL], Our previous study (Tanimoto, J. and Hagishima, A. 2005. State transition probability for the Markov model dealing with on/off cooling schedule in dwellings. Energy and Buildings, 37, 181-187) proposed a set of state transition probabilities for the Markov chain dealing with the on/off cooling schedule in dwellings. The probability of turning on an air conditioner was defined in the form of a sigmoid function by the indoor globe temperature. Obviously, a real stochastic event of shifting from the off to on state is affected by not only indoor thermal quality parameters but also by other complex factors, such as the presence of family members, time of the day and whether it is a weekday or holiday. In this article, we report an alternate model, based on a multilayered artificial neural network (MANN), for predicting the off to on cooling schedule. We gathered field measurement data on family dwellings during the summer of 2008 by deploying hygrothermometers with recording functions to measure the room temperature and the globe and blowout air temperature of the air conditioner. The MANN used has nine nodes in both its input and hidden layers and a single node in its output layer, which implies that the state is either shifting from off to on (1) or not (0). The information provided to the input layer nodes includes the time of the day, whether it is a weekday or holiday, the probability of the presence of inhabitants and the predicted percentage of dissatisfied (PPD) people. PPD, derived from PMV theory, is applied as a representative parameter of the indoor thermal quality, in place of the globe temperature, since it accounts for various influences. The field measurement datasets were divided into two parts: teaching data and data for validation. A model trained by the teaching data was confirmed to reproduce the state transition characteristic of the validation period, which seems complex and is determined by the behaviour of various inhabitants. The performance of the model in reproducing this behaviour is improved over that of the previous model derived from the Markov chain.. |
| 532. | Jun Tanimoto, Aya Hagishima, Takeshi Iwai, Naoki Ikegaya, Total utility demand prediction for multi-dwelling sites by a bottom-up approach considering variations of inhabitants' behaviour schedules, Journal of Building Performance Simulation, 10.1080/19401493.2012.680498, 6, 1, 53-64, 2012.01, [URL], This article reports systematic case studies based on a Total Utility Demand Prediction System presented in the authors' previous works, in which one can follow a bottom-up approach to accurately calculate the time series utility loads (energy, power, city water, hot water, etc.) for multi-dwelling systems, including residential buildings, residential block areas and even an entire city. This calculation considers the behavioural variations of the inhabitants of the dwellings. In the case studies, we assumed a residential building consisting of 100 independent dwellings to accurately predict various peak demands and seasonal or annual demands. A series of simulations reveals that considering time-varying inhabitant behaviour schedules significantly affects the peak loads. Hence, HVAC COP, inhabitants' age and their family type significantly influence the peak loads and their accurate time-series.. |
| 533. | Noriyuki Kishimoto, Satoshi Kokubo, Jun Tanimoto, Network reciprocity on spatial prisoner's dilemma games by Continuous-binary strategy, 2012 Joint 6th International Conference on Soft Computing and Intelligent Systems, SCIS 2012 and 13th International Symposium on Advanced Intelligence Systems, ISIS 2012 6th International Conference on Soft Computing and Intelligent Systems, and 13th International Symposium on Advanced Intelligence Systems, SCIS/ISIS 2012, 10.1109/SCIS-ISIS.2012.6505166, 663-668, 2012, [URL], For 2 × 2 games, especially the Spatial Prisoner's Dilemma (SPD), most of the previous studies presumed that players can offer either cooperation (C) or defection (D), the so-called discrete strategy. In this paper, we define Continuous-binary strategy instead of discrete strategy. And a systematic series of numerical simulations reports that it enhances the network reciprocity for SPD. This new strategy is based on our previous finding that continuous and mixed strategy are robust in boundary games of Chicken and PD (BCH), and Stag Hunt and PD (BSH), respectively. The new strategy allows to put both advantages of continuous and mixed strategies on usual discrete strategy together in one model.. |
| 534. | Tanimoto,J., Hagishima,A., State Transition Stochastic Model for Predicting Off-to-On Cooling Schedule in Dwellings as Implemented using a Multilayered Artificial Neural Network, Journal of Building Performance Simulation, Journal of Building Performance Simulation, 2011.12, Our previous study (Tanimoto & Hagishima (2005), Energy and Buildings) proposed a set of state transition probabilities for the Markov chain dealing with the on/off cooling schedule in dwellings. The probability of turning on an air conditioner was defined in the form of a sigmoid function by the indoor globe temperature. Obviously, a real stochastic event of shifting from the off to on state is affected by not only indoor thermal quality parameters but also other complex factors such as the presence of family members, time of the day, and whether it is a weekday or holiday. In this paper, we report an alternate model, based on a multilayered artificial neural network (MANN), for predicting the off to on cooling schedule. We gathered field measurement data on family dwellings during the summer of 2008 by deploying hygrothermometers with recording functions to measure the room temperature and the globe and blowout air temperature of the air conditioner. The MANN used has nine nodes in both its input and hidden layers and a single node in its output layer, which implies that the state is either shifting from off to on (1) or not (0). The information provided to the input layer nodes includes the time of the day, whether it is a weekday or holiday, the probability of the presence of inhabitants, and the predicted percentage of dissatisfied people (PPD). PPD, derived from PMV theory, is applied as a representative parameter of the indoor thermal quality, in place of the globe temperature, since it accounts for various influences. The field measurement datasets were divided into two parts: teaching data and data for validation. A model trained by the teaching data was confirmed to reproduce the state transition characteristic of the validation period, which seems complex and is determined by the behavior of various inhabitants. The performance of the model in reproducing this behavior is improved over that of the previous model derived from the Markov chain.. |
| 535. | 茎田慎司，谷本潤，萩島理, 車線変更が交通流にもたらすジレンマ構造の解析, 第17回交通流のシミュレーションシンポジウム, 17-20, 2011.12. |
| 536. | 宮地浩平，谷本潤，萩島理，小窪聡, Ultimatum Gameにおけるネットワークと戦略適応の共進化モデルに基づく社会的協調の自己組織化, 第17回交通流のシミュレーションシンポジウム, 13-16, 2011.12. |
| 537. | 志垣圭蔵，小窪聡，谷本潤，萩島理, 自己利得の大きさによる戦略コピー耐性をPairwise-Fermiに組み込んだ囚人ジレンマゲームのネットワーク互恵, 第17回交通流のシミュレーションシンポジウム, 9-12, 2011.12. |
| 538. | 岸本憲幸，小窪聡，谷本潤，萩島理, 囚人のジレンマにおける連続戦略から離散戦略への切り替えによるネットワーク互恵, 第17回交通流のシミュレーションシンポジウ, 5-8, 2011.12. |
| 539. | 小窪聡，谷本潤，萩島理, ネットワーク上の進化ゲームにおける連続戦略および混合戦略がもたらす協調創発機構の解明, 第17回交通流のシミュレーションシンポジウム, 1-4, 2011.12. |
| 540. | Tanimoto,J., Influence of strategy adaptation speed on network reciprocity for evolutionary prisoner’s dilemma games, Sociobiology, 58, 2, 315-325, 2011.11. |
| 541. | Tanimoto,J., Nakata,M., Hagishima,A., Ikegaya,N., Spatially correlated heterogeneous aspirations to enhance network reciprocity, Physica A, 2011.11. |
| 542. | Zaki,S,A., Hagishima,A., Tanimoto,J., Spatial distribution of pressure drag acting on rectangular block arrays with various layouts, Proc. of 12th IBPSA Conference, 2011.11. |
| 543. | Tanimoto,J., Hagishima,A, Iwai,T., Ikegaya,N., Total utility demand prediction for multi-dwelling sites considering variation of occupant behavior schedules, Proc. of 12th IBPSA Conference, 2011.11. |
| 544. | Tanimoto,J., Sagara,H., Social diffusive impact analysis based on evolutionary computations for a novel car navigation system sharing individual information in urban traffic systems, Journal of Navigation, 64, 4, 1-15, 64 (4), 1-15 , 2011, 2011.10. |
| 545. | 池谷直樹,萩島理,谷本潤, 立方体粗度群床面－大気間のスカラー輸送現象に関するLarge-Eddy Simulation, 日本建築学会環境系論文集, 76, 668, 2011.10. |
| 546. | Shigaki,K., Tanimoto.J., Hagishima,A., A Revised Stochastic Optimal Velocity Model Considering the Velocity Gap with a Preceding Vehicle, Journal of Modern Physics C, http://dx.doi.org/10.1142/S0129183111016749, 22 (9), 1005-1014, 2011.10. |
| 547. | Naoki Ikegaya, Aya Hagishimaand, Jun Tanimoto, Large-eddy simulation large-eddysimulation onscalartransferphenomena betweenurbansurfaceandatmosphere, Journal of Environmental Engineering (Japan), 10.3130/aije.76.943, 76, 668, 943-951, 2011.10, [URL], The authors performed a numerical simulation of scalar transfer phenomena between an urban surface and atmosphere. A parallelized large-eddy simulation model was adopted for the simulation. Two types of regular block arrays, a square array and staggered array, were arranged on the floor of computational domains. It was assumed that area scalar source was installed on the floor of arrays and scalar fluxes were estimated by using a wall function based on a logarithmic law. The results are summarized as follows. (l) The flow statistics of the normalized wind speed and turbulence intensity above a canopy showed good agreement with that obtained experimentally. (2) Scalar profiles shows self-similarity after 3rd rows. (3) Scalar boundary layer develops rapidly especially the edge of the scalar source area because of upward wind due to roughness.. |
| 548. | Jun Tanimoto, Hiroki Sagara, Social diffusive impact analysis based on evolutionary computations for a novel car navigation system sharing individual information in urban traffic systems, Journal of Navigation, 10.1017/S037346331100021X, 64, 4, 711-725, 2011.10, [URL], In this study, an experiment to establish a model for human-environment social systems, a multi-agent simulation model to deal with urban traffic congestion problems involving automobiles embedded with several strategies of car navigation systems (CNS), is presented. A shortest time route with route information sharing strategy (ST-RIS) is believed to be one of the solutions for a novel CNS based on bilateral information shared among automobile agents. We assume several strategies including ST-RIS for agents, which are defined differently in terms of their information-handling process. The question of which strategy is most appropriate for solving urban traffic congestion can be seen as a social dilemma, because social holistic utility may conflict with an agent's individual utility. The presented model shows that this social dilemma can be observed as a typical chicken-type dilemma, or as a typical minority game, where an agent who has adopted a minority strategy can earn more utility compared to when other strategies are used. Consequently, the model has illustrated that shortest time route with partial route information sharing strategy (ST-pRIS), which is an advanced strategic form of ST-RIS in which only partial information is shared among agents, has moderate potential to be diffused in a society from the viewpoint of the evolutionary game theory.. |
| 549. | Jun Tanimoto, Hiroki Sagara, Social Diffusive Impact Analysis Based on Evolutionary Computations for a Novel Car Navigation System Sharing Individual Information in Urban Traffic Systems, JOURNAL OF NAVIGATION, 10.1017/S037346331100021X, 64, 4, 711-725, 2011.10, In this study, an experiment to establish a model for human-environment social systems, a multi-agent simulation model to deal with urban traffic congestion problems involving automobiles embedded with several strategies of car navigation systems (CNS), is presented. A shortest time route with route information sharing strategy (ST-RIS) is believed to be one of the solutions for a novel CNS based on bilateral information shared among automobile agents. We assume several strategies including ST-RIS for agents, which are defined differently in terms of their information-handling process. The question of which strategy is most appropriate for solving urban traffic congestion can be seen as a social dilemma, because social holistic utility may conflict with an agent's individual utility. The presented model shows that this social dilemma can be observed as a typical chicken-type dilemma, or as a typical minority game, where an agent who has adopted a minority strategy can earn more utility compared to when other strategies are used. Consequently, the model has illustrated that shortest time route with partial route information sharing strategy (ST-pRIS), which is an advanced strategic form of ST-RIS in which only partial information is shared among agents, has moderate potential to be diffused in a society from the viewpoint of the evolutionary game theory.. |
| 550. | Tanimoto,J., Editorial; Evolutionary World; Games, Complex networks, Agent simulations, International Journal of Bio-inspired Computation , 3, 3, 2011.09. |
| 551. | Tanimoto,J., A study of a quadruple co-evolutionary model and its reciprocity phase for various Prisoner’s Dilemma games, International Journal of Modern Physics C, 2011.09. |
| 552. | Shigaki,K., Tanimoto.A., Hagishima,A., A Revised Stochastic Optimal Velocity Model Considering the Velocity Gap with a Preceding Vehicle, International Journal of Modern Physics C, 2011.09. |
| 553. | Keizo Shigaki, Jun Tanimoto, Aya Hagishima, A revised stochastic optimal velocity model considering the velocity gap with a preceding vehicle, International Journal of Modern Physics C, 10.1142/S0129183111016749, 22, 9, 1005-1014, 2011.09, [URL], The stochastic optimal velocity (SOV) model, which is a cellular automata model, has been widely used because of its good reproducibility of the fundamental diagram, despite its simplicity. However, it has a drawback: in SOV, a vehicle that is temporarily stopped takes a long time to restart. This study proposes a revised SOV model that suppresses this particular defect; the basic concept of this model is derived from the car-following model, which considers the velocity gap between a particular vehicle and the preceding vehicle. A series of simulations identifies the model parameters and clarifies that the proposed model can reproduce the three traffic phases: free, jam, and even synchronized phases, which cannot be achieved by the conventional SOV model.. |
| 554. | Yuichi Tabata, Akashi Mochida, Naoko Konno, Aya Kikuchi, Takashi Maruyama, Aya Hagishima, Jun Tanimoto, Optimization of model coefficients for different configurations and densities of car molds Development of CFD model for reproducing aerodynamic effects of moving automobiles (Part 1), Journal of Environmental Engineering (Japan), 10.3130/aije.76.831, 76, 667, 831-837, 2011.09, [URL], The aim of this study is to develop a simulation method for predicting the wind environment and turbulent diffusion process, whichare affected by moving automobiles within the real situation of urban street canyon. In this study, a simulation method to reproduce the aerodynamic effects generated from the moving automobiles based on the methodology of canopy models, namely 'Vehicle Canopy Model', was developed. Furthermore, a series of wind tunnel measurements of flow over car-shaped roughness elements and the dragforces caused by the roughness with different configurations and densities were carried out. By comparing the results of CFD predictions of the developed 'Vehicle Canopy Model' with experimental data, the accuracy of the developed model was examined.. |
| 555. | Keizo Shigaki, Jun Tanimoto, Aya Hagishima, A REVISED STOCHASTIC OPTIMAL VELOCITY MODEL CONSIDERING THE VELOCITY GAP WITH A PRECEDING VEHICLE, INTERNATIONAL JOURNAL OF MODERN PHYSICS C, 10.1142/S0129183111016749, 22, 9, 1005-1014, 2011.09, The stochastic optimal velocity (SOV) model, which is a cellular automata model, has been widely used because of its good reproducibility of the fundamental diagram, despite its simplicity. However, it has a drawback: in SOV, a vehicle that is temporarily stopped takes a long time to restart. This study proposes a revised SOV model that suppresses this particular defect; the basic concept of this model is derived from the car-following model, which considers the velocity gap between a particular vehicle and the preceding vehicle. A series of simulations identifies the model parameters and clarifies that the proposed model can reproduce the three traffic phases: free, jam, and even synchronized phases, which cannot be achieved by the conventional SOV model.. |
| 556. | 萩島理,谷本潤,菊池圭起,山口真人, 粗度要素の形状が床面抗力に及ぼす影響に関する風洞実験, 日本建築学会環境系論文集, 日本建築学会環境系論文集, 76, 663, 2011.05. |
| 557. | Aya Hagishima, Jun Tanimoto, Manato Yamaguchi, Yoshiki Kikuchi, Wind tunnel experiment on effect of shape of an obstacle on total drag force of regular array, Journal of Environmental Engineering (Japan), 10.3130/aije.76.485, 76, 663, 485-492, 2011.05, [URL], Drag coefficients (Cd) and vertical wind profiles for regular arrays were measured in a systematic series of wind tunnel experiment to investigate Hie shape effect of roughness element on Cd and air flow dynamics, and following results were presented. 1) Cd of an array consists of miniature vehicles was compared with that of an array consists of a combination of two different blocks, and the former is 10% to 20% lower than the latter due to the effect of the curved surface, in spite of their similar external scale. 2) The staggered array consists of elements with higher ratio shows larger peak of Cd against roughness density because of the less bluff-body character of a slender obstacle. 3) Turbulent characteristics within canopy layer of an array with high aspect ratio is similar to that of plant canopy.. |
| 558. | Kukida,S., Tanimoto,J., Hagishima,A., Analysis of the influence of lane changing on traffic-flow dynamics based on the cellular automaton model, International Journal of Modern Physics C, 22, 3, 271-281, 2011.04. |
| 559. | Jun Tanimoto, A study of a quadruple co-evolutionary model and its reciprocity phase for various Prisoner's Dilemma game, International Journal of Modern Physics C, 10.1142/S0129183111016324, 22, 4, 401-417, 2011.04, [URL], We present and numerically investigate a quadruple co-evolutionary model for 2 × 2 Prisoner's Dilemma games which allows not only for agents to adopt strategy (Cooperation C or Defection D) and for network topology, but also for the probability of link rewiring that controls the speed of network evolution and the updating rule itself. The results of a series of simulations reveal that C agents in a coexisting phase increase their rewiring probability to avoid neighboring D agents' exploitation through the Game Exit Option. This evolutionary process leads most agents to adopt pairwise updating even though Imitation Max update adopted by all agents brings a higher payoff.. |
| 560. | Jun Tanimoto, A STUDY OF A QUADRUPLE CO-EVOLUTIONARY MODEL AND ITS RECIPROCITY PHASE FOR VARIOUS PRISONER'S DILEMMA GAME, INTERNATIONAL JOURNAL OF MODERN PHYSICS C, 10.1142/S0129183111016324, 22, 4, 401-417, 2011.04, We present and numerically investigate a quadruple co-evolutionary model for 2 x 2 Prisoner's Dilemma games which allows not only for agents to adopt strategy (Cooperation C or Defection D) and for network topology, but also for the probability of link rewiring that controls the speed of network evolution and the updating rule itself. The results of a series of simulations reveal that C agents in a coexisting phase increase their rewiring probability to avoid neighboring D agents' exploitation through the Game Exit Option. This evolutionary process leads most agents to adopt pairwise updating even though Imitation Max update adopted by all agents brings a higher payoff.. |
| 561. | 谷本潤, 4重共進化モデルによる囚人ジレンマゲームにおける互恵相に関する考察, 日本応用数理学会, 21, 1, 25-36, 2011.03. |
| 562. | Shinji Kukida, Jun Tanimoto, Aya Hagishima, Analysis of the influence of lane changing on traffic-flow dynamics based on the cellular automaton model, International Journal of Modern Physics C, 10.1142/S012918311101621X, 22, 3, 271-281, 2011.03, [URL], Many cellular automaton models (CA models) have been applied to analyze traffic flow. When analyzing multilane traffic flow, it is important how we define lane-changing rules. However, conventional models have used simple lane-changing rules that are dependent only on the distance from neighboring vehicles. We propose a new lane-changing rule considering velocity differences with neighboring vehicles; in addition, we embed the rules into a variant of the NagelSchreckenberg (NaSch) model, called the S-NFS model, by considering an open boundary condition. Using numerical simulations, we clarify the basic characteristics resulting from different assumptions with respect to lane changing.. |
| 563. | Shinji Kukida, Jun Tanimoto, Aya Hagishima, ANALYSIS OF THE INFLUENCE OF LANE CHANGING ON TRAFFIC-FLOW DYNAMICS BASED ON THE CELLULAR AUTOMATON MODEL, INTERNATIONAL JOURNAL OF MODERN PHYSICS C, 10.1142/S012918311101621X, 22, 3, 271-281, 2011.03, Many cellular automaton models (CA models) have been applied to analyze traffic flow. When analyzing multilane traffic flow, it is important how we define lane-changing rules. However, conventional models have used simple lane-changing rules that are dependent only on the distance from neighboring vehicles. We propose a new lane-changing rule considering velocity differences with neighboring vehicles; in addition, we embed the rules into a variant of the Nagel-Schreckenberg (NaSch) model, called the S-NFS model, by considering an open boundary condition. Using numerical simulations, we clarify the basic characteristics resulting from different assumptions with respect to lane changing.. |
| 564. | 大濱淳司,萩島理,谷本潤, コンジョイント分析を適用した地球温暖化対策及びヒートアイランド対策の社会的価値の計測に関する調査研究, 日本建築学会環境系論文集, 76, 660, 211-219, 2011.02. |
| 565. | 谷本潤,萩島理, 住棟･街区など多住戸系への適用を前提にした居住者の生活スケジュールの多様性を考慮した包括的ユーティリティデマンド予測手法, 日本建築学会環境系論文集, 76, 660, 2011.02. |
| 566. | Satoshi Kokubo, Jun Tanimoto, Aya Hagishima, A new Cellular Automata Model including a decelerating damping effect to reproduce Kerner's three-phase theory, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2010.10.027, 390, 4, 561-568, 2011.02, [URL], Most of the conventional traffic Cellular Automaton (CA) models based on the NagelSchreckenberg model (NaSch model) have two problems: an unrealistic deceleration dynamics when a vehicle agent collides with a preceding vehicle in a stopping event, and the problem with reproducing the synchronized flow in Kerner's three-phase theory. In this paper, a revised stochastic NishinariFukuiSchadschneider (S-NFS) model, belonging to the class of NaSch models, is presented. The proposed CA model, where a random braking effect is improved by considering the dependency on the velocity difference and heading distance with a preceding vehicle, is confirmed to overcome the two above-mentioned drawbacks.. |
| 567. | Satoshi Kokubo, Jun Tanimoto, Aya Hagishima, A new Cellular Automata Model including a decelerating damping effect to reproduce Kerner's three-phase theory, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2010.10.027, 390, 4, 561-568, 2011.02, Most of the conventional traffic Cellular Automaton (CA) models based on the Nagel-Schreckenberg model (NaSch model) have two problems: an unrealistic deceleration dynamics when a vehicle agent collides with a preceding vehicle in a stopping event, and the problem with reproducing the synchronized flow in Kerner's three-phase theory. In this paper, a revised stochastic Nishinari-Fukui-Schadschneider (S-NFS) model, belonging to the class of NaSch models, is presented. The proposed CA model, where a random braking effect is improved by considering the dependency on the velocity difference and heading distance with a preceding vehicle, is confirmed to overcome the two above-mentioned drawbacks. (C) 2010 Elsevier B.V. All rights reserved.. |
| 568. | 池谷直樹, 萩島理, 谷本潤, 田中雄大,成田健一, 平面配列のランダム性、及び濃度境界層、粗度周辺気流がバルクスカラー係数に与える影響, 日本建築学会環境系論文集, 76, 659, 67-73, 2011.01. |
| 569. | Atsuo Yamauchi, Jun Tanimoto, Aya Hagishima, An analysis of network reciprocity in Prisoner's Dilemma games using Full Factorial Designs of Experiment, BioSystems, 10.1016/j.biosystems.2010.10.006, 103, 1, 85-92, 2011.01, [URL], Despite hundreds of studies on the Prisoner's Dilemma (PD) game, understanding about network reciprocity remains a unsolved puzzle. Thus, we performed a series of Full Factorial Design of Experiments (FFDOE) to evaluate what dominates emerging cooperation in the PD game on various networks. The results qualitatively reveal the influence of each factor and show that some combinations of factors have complicated interactions. Remarkably, the choice of strategy update rule or update dynamics is much more important than the type of network imposed or, at least, the factorial effect of the average degree of the network reported by Nowak (Science 314, 5805, 1560-1563, 2006) and Ohtsuki et al. (Nature 441, 502-505, 2006). Furthermore, the decision of which PD game type to investigate (whether all PD games, PD-Chicken boundary games or Donor & Recipient games) is important for discussing network reciprocity.. |
| 570. | Motoya Wakiyama, Jun Tanimoto, Reciprocity phase in various 2×2 games by agents equipped with two-memory length strategy encouraged by grouping for interaction and adaptation, BioSystems, 10.1016/j.biosystems.2010.10.009, 103, 1, 93-104, 2011.01, [URL], This paper numerically investigates 2 × 2 games involving the Prisoner's Dilemma, Chicken, Hero, Leader, Stag Hunt, and Trivial Games in which agents have a strategy expressed by five-bit, two-memory length. Our motivation is to explore how grouping for game interaction and strategy adaptation influence ST reciprocity and R reciprocity (Tanimoto and Sagara, 2007a [Tanimoto, J., Sagara, H., 2007a. A study on emergence of coordinated alternating reciprocity in a 2 × 2 game with 2-memory length strategy. Biosystems 90(3), 728-737]. Enhanced R reciprocity is observed with the stronger grouping for game interaction when a relatively stronger grouping for strategy adaptation is assumed. On the other hand, enhanced ST reciprocity emerged with the stronger grouping for strategy adaptation when the relatively weaker grouping for game interaction is imposed. Our numerical experiment deals with those two groupings independently and dependently.. |
| 571. | Sheikh Ahmad Zaki, Aya Hagishima, Jun Tanimoto, Naoki Ikegaya, Aerodynamic Parameters of Urban Building Arrays with Random Geometries, BOUNDARY-LAYER METEOROLOGY, 10.1007/s10546-010-9551-7, 138, 1, 99-120, 2011.01, It is difficult to describe the flow characteristics within and above urban canopies using only geometrical parameters such as plan area index (lambda (p)) and frontal area index (lambda (f)) because urban surfaces comprise buildings with random layouts, shapes, and heights. Furthermore, two types of 'randomness' are associated with the geometry of building arrays: the randomness of element heights (vertical) and that of the rotation angles of each block (horizontal). In this study, wind-tunnel experiments were conducted on seven types of urban building arrays with various roughness packing densities to measure the bulk drag coefficient (C(d)) and mean wind profile; aerodynamic parameters such as roughness length (z(o)) and displacement height (d) were also estimated. The results are compared with previous results from regular arrays having neither 'vertical' nor 'horizontal' randomness. In vertical random arrays, the plot of C(d) and z(o) versus lambda (f) exhibited a monotonic increase, and zo increased by a factor of almost two for lambda (f) = 48-70%. C(d) was strongly influenced by the standard deviation of the height of blocks (sigma) when lambda (p) >= 17%, whereas C(d) was independent of sigma when lambda (p) = 7%. In the case of horizontal random arrays, the plot of the estimated C(d) against lambda (f) showed a peak. The effect of both vertical and horizontal randomness of the layout on aerodynamic parameters can be explained by the structure of the vortices around the blocks; the aspect ratio of the block is an appropriate index for the estimation of such features.. |
| 572. | Atsuo Yamauchi, Jun Tanimoto, Aya Hagishima, An analysis of network reciprocity in Prisoner's Dilemma games using Full Factorial Designs of Experiment, BIOSYSTEMS, 10.1016/j.biosystems.2010.10.006, 103, 1, 85-92, 2011.01, Despite hundreds of studies on the Prisoner's Dilemma (PD) game, understanding about network reciprocity remains a unsolved puzzle. Thus, we performed a series of Full Factorial Design of Experiments (FFDOE) to evaluate what dominates emerging cooperation in the PD game on various networks. The results qualitatively reveal the influence of each factor and show that some combinations of factors have complicated interactions. Remarkably, the choice of strategy update rule or update dynamics is much more important than the type of network imposed or, at least, the factorial effect of the average degree of the network reported by Nowak (Science 314, 5805, 1560-1563, 2006) and Ohtsuki et al. (Nature 441, 502-505, 2006). Furthermore, the decision of which PD game type to investigate (whether all PD games, PD-Chicken boundary games or Donor & Recipient games) is important for discussing network reciprocity. (C) 2010 Elsevier Ireland Ltd. All rights reserved.. |
| 573. | Motoya Wakiyama, Jun Tanimoto, Reciprocity phase in various 2 x 2 games by agents equipped with two-memory length strategy encouraged by grouping for interaction and adaptation, BIOSYSTEMS, 10.1016/j.biosystems.2010.10.009, 103, 1, 93-104, 2011.01, This paper numerically investigates 2 x 2 games involving the Prisoner's Dilemma, Chicken, Hero, Leader, Stag Hunt, and Trivial Games in which agents have a strategy expressed by five-bit, two-memory length. Our motivation is to explore how grouping for game interaction and strategy adaptation influence ST reciprocity and R reciprocity (Tanimoto and Sagara, 2007a [Tanimoto, J., Sagara, H., 2007a. A study on emergence of coordinated alternating reciprocity in a 2 x 2 game with 2-memory length strategy. Biosystems 90(3), 728-737]. Enhanced R reciprocity is observed with the stronger grouping for game interaction when a relatively stronger grouping for strategy adaptation is assumed. On the other hand, enhanced ST reciprocity emerged with the stronger grouping for strategy adaptation when the relatively weaker grouping for game interaction is imposed. Our numerical experiment deals with those two groupings independently and dependently. (C) 2010 Elsevier Ireland Ltd. All rights reserved.. |
| 574. | Sheikh Ahmad Zaki, Aya Hagishima, Jun Tanimoto, Naoki Ikegaya, Aerodynamic Parameters of Urban Building Arrays with Random Geometries, Boundary-Layer Meteorology, 10.1007/s10546-010-9551-7, 138, 1, 99-120, 2011, [URL], It is difficult to describe the flow characteristics within and above urban canopies using only geometrical parameters such as plan area index (λp) and frontal area index (λf) because urban surfaces comprise buildings with random layouts, shapes, and heights. Furthermore, two types of 'randomness' are associated with the geometry of building arrays: the randomness of element heights (vertical) and that of the rotation angles of each block (horizontal). In this study, wind-tunnel experiments were conducted on seven types of urban building arrays with various roughness packing densities to measure the bulk drag coefficient (Cd) and mean wind profile; aerodynamic parameters such as roughness length (zo) and displacement height (d) were also estimated. The results are compared with previous results from regular arrays having neither 'vertical' nor 'horizontal' randomness. In vertical random arrays, the plot of Cd and zo versus λf exhibited a monotonic increase, and zo increased by a factor of almost two for λf = 48-70%. Cd was strongly influenced by the standard deviation of the height of blocks (σ) when λp ≥ 17%, whereas Cd was independent of σ when λp = 7%. In the case of horizontal random arrays, the plot of the estimated Cd against λf showed a peak. The effect of both vertical and horizontal randomness of the layout on aerodynamic parameters can be explained by the structure of the vortices around the blocks; the aspect ratio of the block is an appropriate index for the estimation of such features.. |
| 575. | Naoki Ikegaya, Aya Hagishima, Jun Tanimoto, Yu Dai Tanaka, Ken Ichi Narita, Effects on bulk scalar coefficient of wind angle, Development of scalar boundary layer and flow field near roughness, Journal of Environmental Engineering (Japan), 10.3130/aije.76.67, 76, 659, 67-73, 2011, [URL], The authors performed wind-tunnel experiments to investigate bulk scalar coefficients between an urban-like 3 dimensional roughnesses and atmosphere using salinity method. In this paper, three main effects were investigated. Firstly, the effects of randomness of layouts of each block were discussed. Bulk scalar coefficients were measured on arrays with cubic blocks, whose angle against the wind were randomly changed. Secondly the sizes of scalar source were considered under three conditions of plan area indices with square and staggered array. The results showed that bulk scalar coefficients were affected by the size as mentioned in previous studies, however, the relation between geometrical conditions and the coefficients were independent with the size. Lastly, the effects of vertical mixture of air caused by roughness elements were discussed based on the measurement of wind profile for each array. This investigation showed that certain plan layouts might strongly affect on vertical exchange of air.. |
| 576. | Jun Tanimoto, Influence of strategy adaptation speed on network reciprocity for evolutionary prisoner's dilemma games, Sociobiology, 58, 2, 315-326, 2011, Following our previous study (Tanimoto, submitted to Physica A) on how network reciprocity is affected when strategy adaptation speed is slower than gaming speed, we conducted a series of simulations to obtain a deeper insight. In the case of a spatial prisoner s dilemma on a scale-free network with a spatial distribution of the strategy updating time scale, we found that a negative correlation between degree and strategy updating speed brings an extremely large cooperation-enhancing effect. This might be because a cooperative hub agent who is insensitive to strategy adaptation can protect against defection invasion at the initial stage of a simulation episode to initiate a cooperative situation.. |
| 577. | Junji Ohama, Aya Hagishima, Jun Tanimoto, Research on social value measurement of global warming and heat island countermeasures applied conjoint analysis, Journal of Environmental Engineering (Japan), 10.3130/aije.76.211, 76, 660, 211-219, 2011, [URL], A systematical field survey applied Conjoint Analysis (CA) concerned on two specified social issues; global warming and heat island problems is conducted. We applied the so-called web-site survey to secure both quantity and quality of a series of acquired data sets. Both obtained Marginal Willing to Pay (MWTP) for the global warming and heat island issues seems plausible. Interestingly, it is observed an evident tendency that younger subjects incline to pay more than older subjects, which implies younger people paying much attention to the environmental issues. We found that the level range of payment in a questionnaire significantly affects MWTP, which means how design a payment range would bring considerable bias in some cases. Also a principle problem whether a subject's payment was questioned by explicit as a form of additional payment to the public or implicit as a form of re-allocation of already-collected tax from the people, is observed significantly influential in the MWTP The result also suggests that three-choice type CA seems better than pairwise type CA to obtain plausible MWTP when a questionnaire relates to a certain ideal issue that is difficult for subjects to understand its trade-off structure in proper way.. |
| 578. | Sheikh Ahmad Zaki, Aya Hagishima, Jun Tanimoto, Spatial distribution of pressure drag acting on rectangular block arrays with various layouts, 12th Conference of International Building Performance Simulation Association Building Simulation 2011, BS 2011 Proceedings of Building Simulation 2011: 12th Conference of International Building Performance Simulation Association, 1686-1693, 2011, This study reported a series of wind tunnel experiments on the spatial distribution of the pressure drag acting on the walls of rectangular block arrays, which were arranged in staggered, square, and diamond layouts under the conditions of different packing densities. The obtained bulk pressure coefficients of a block located in various staggered arrays showed clear dependency of packing density. This result suggests the importance of the consideration for the reduction of wind-driven cross ventilation due to neighborhood densely built-up area in building simulation coupled with ventilation model.. |
| 579. | Jun Tanimoto, Aya Hagishima, Total utility demand prediction considering variation of occupants' behavior schedules applied to multi dwellings, Journal of Environmental Engineering (Japan), 10.3130/aije.76.141, 76, 660, 141-149, 2011, [URL], Following the authors' previous work, this paper describes a new methodology in calculating accurately the time series utility loads (energy, power, citywater, hot water, etc.) for multi-dwelling system such as a whole residential building, residential block area, even a city by means of the so-called bottom-up approach. This calculation takes into account the behavioral variations of the dwelling inhabitants. The proposed method contains a procedure for procedure for cooling load calculations based on a series of Monte Carlo simulations where the HVAC on/off state and the indoor heat generation schedules are varied, time-step by time-step. A data set of time-varying inhabitant behavior schedules, with a 15 minute resolution, was integrated into the model. The established model, which is called the Total Utility Demand Prediction System (TUD-PS) was integrated to estimate multi dwellings system, where we can accurately argue various peak demands and seasonal or annual demands. By applying to a typical residential bmlding, we highlight several advantages of TUD-PS.. |
| 580. | Jun Tanimoto, Aya Hagishima, Takeshi Iwai, Naoki Ikegaya, Total utility demand prediction for multi-dwelling sites considering variation of occupant behavior schedules, 12th Conference of International Building Performance Simulation Association Building Simulation 2011, BS 2011 Proceedings of Building Simulation 2011: 12th Conference of International Building Performance Simulation Association, 2011, Based on the authors' previous works, this paper describes a new methodology that uses a bottom-up approach for accurately calculating the time series utility loads (e.g., energy, power, city water, hot water, etc.) for multi-dwelling systems, including residential buildings, residential block areas, and even the entire city. This calculation considers the behavioral variations of the inhabitants of the dwellings. The proposed method constitutes a procedure for calculating cooling/ heating loads based on a series of Monte Carlo simulations where the HVAC on/off state and the indoor heat generation schedules are varied at a time interval. A data set of time-varying inhabitant behavior schedules with a 15-minute time resolution was integrated into the model. The established model, which is called the Total Utility Demand Prediction System (TUD-PS), was integrated to estimate a multi-dwelling system, where we can accurately predict various peak demands and seasonal or annual demands. By applying this method to a typical residential building, we highlighted several advantages of TUD-PS.. |
| 581. | Makoto Nakata, Atsuo Yamauchi, Jun Tanimoto, Aya Hagishima, Dilemma game structure hidden in traffic flow at a bottleneck due to a 2 into 1 lane junction, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2010.08.005, 389, 23, 5353-5361, 2010.12, [URL], Following Yamauchi's study [A. Yamauchi, J. Tanimoto, A. Hagishima, H. Sagara, Dilemma game structure observed in traffic flow at a 2-to-1 lane junction, Physical Review E 79 (2009) 036104], we find that several social dilemma structures are represented by n-person Prisoner's Dilemma (n-PD) games in certain traffic flow phases at a bottleneck caused by a lane-closing section. In this study, the stochastic NishinariFukuiSchadschneider (S-NFS) model was adopted as a cellular automaton traffic model. In the system, two classes of driver-agents coexist: C-Agents (cooperative strategy) always driving in the first lane, and D-Agents (defective strategy) trying to drive in a lower-density lane, whether the first or the second lane. In relatively high-density flow phases, such as the metastable phase and the high-density phase, we found n-PD games, where D-Agents' interruption into the first lane from the second just before the lane-closing section creates a heavier traffic jam, which reduces social efficiency. This could be solved by decreasing the interruption probability, which can be realized by a provision where drivers in the first lane firmly refuse interruptions.. |
| 582. | Jun Tanimoto, Aya Hagishima, Yasukaka Tanaka, Study of bottleneck effect at an emergency evacuation exit using cellular automata model, mean field approximation analysis, and game theory, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2010.08.032, 389, 24, 5611-5618, 2010.12, [URL], An improved cellular automaton model for pedestrian dynamics was established, where both static floor field and collision effect derived from game theory were considered. Several model parameters were carefully determined by previous studies. Results obtained through model-based simulation and analytical approach (derived from mean field approximation) proved that outflow rate from an evacuation exit, which is usually estimated using outflow coefficient in building codes in Japan, can be improved by placing an appropriate obstacle in front of the exit. This can reduce collision probability at the exit by increasing collisions around the obstacles ahead of the exit.. |
| 583. | Makoto Nakata, Atsuo Yamauchi, Jun Tanimoto, Aya Hagishima, Dilemma game structure hidden in traffic flow at a bottleneck due to a 2 into 1 lane junction, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2010.08.005, 389, 23, 5353-5361, 2010.12, Following Yamauchi's study [A. Yamauchi, J. Tanimoto, A. Hagishima, H. Sagara, Dilemma game structure observed in traffic flow at a 2-to-1 lane junction, Physical Review E 79 (2009)0361041, we find that several social dilemma structures are represented by n-person Prisoner's Dilemma (n-PD) games in certain traffic flow phases at a bottleneck caused by a lane-closing section. In this study, the stochastic Nishinari-Fukui-Schadschneider (S-NFS) model was adopted as a cellular automaton traffic model. In the system, two classes of driver-agents coexist: C-Agents (cooperative strategy) always driving in the first lane, and D-Agents (defective strategy) trying to drive in a lower-density lane, whether the first or the second lane. In relatively high-density flow phases, such as the metastable phase and the high-density phase, we found n-PD games, where D-Agents' interruption into the first lane from the second just before the lane-closing section creates a heavier traffic jam, which reduces social efficiency. This could be solved by decreasing the interruption probability, which can be realized by a provision where drivers in the first lane firmly refuse interruptions. (C) 2010 Elsevier B.V. All rights reserved.. |
| 584. | Jun Tanimoto, Aya Hagishima, Yasukaka Tanaka, Study of bottleneck effect at an emergency evacuation exit using cellular automata model, mean field approximation analysis, and game theory, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2010.08.032, 389, 24, 5611-5618, 2010.12, An improved cellular automaton model for pedestrian dynamics was established, where both static floor field and collision effect derived from game theory were considered. Several model parameters were carefully determined by previous studies. Results obtained through model-based simulation and analytical approach (derived from mean field approximation) proved that outflow rate from an evacuation exit, which is usually estimated using outflow coefficient in building codes in Japan, can be improved by placing an appropriate obstacle in front of the exit. This can reduce collision probability at the exit by increasing collisions around the obstacles ahead of the exit. (C) 2010 Elsevier B.V. All rights reserved.. |
| 585. | Zaki,S,A., Hagishima,A., Tanimoto,J., Ikegaya,N., Aerodynamic parameters of urban building arrays with random geometries, Boundary-Layer Meteorology, http://www.springerlink.com/openurl.asp?genre=article&id=doi:10.1007/s10546-010-9551-7., 138 , 1, 99-12, 2010.11, [URL]. |
| 586. | Atsuo Yamauchi, Jun Tanimoto, Aya Hagishima, What controls network reciprocity in the Prisoner's Dilemma game?, BioSystems, 10.1016/j.biosystems.2010.07.017, 102, 2-3, 82-87, 2010.11, [URL], The evolutionary Prisoner's Dilemma game in structured networks has been studied extensively to understand network reciprocity. However, in some cases results of these studies cannot be compared because not only the network structures but also the network parameters, rules for updating strategies, and update dynamics differ among them. In this study, we investigated the effect of experimental conditions by conducting a series of systematic factorial experiments. We found that those experimental assumptions are significantly important in network reciprocity, although we confirmed that network reciprocity can be basically explained by the average degree of the network (Nowak, 2006; Ohtsuki et al., 2006).. |
| 587. | Atsuo Yamauchi, Jun Tanimoto, Aya Hagishima, What controls network reciprocity in the Prisoner's Dilemma game?, BIOSYSTEMS, 10.1016/j.biosystems.2010.07.017, 102, 2-3, 82-87, 2010.11, The evolutionary Prisoner's Dilemma game in structured networks has been studied extensively to understand network reciprocity. However, in some cases results of these studies cannot be compared because not only the network structures but also the network parameters, rules for updating strategies, and update dynamics differ among them. In this study, we investigated the effect of experimental conditions by conducting a series of systematic factorial experiments. We found that those experimental assumptions are significantly important in network reciprocity, although we confirmed that network reciprocity can be basically explained by the average degree of the network (Nowak, 2006; Ohtsuki et al., 2006). (C) 2010 Elsevier Ireland Ltd. All rights reserved.. |
| 588. | 萩島理,成田健一,谷本潤, 不安定条件下の屋外都市キャノピー層における気温の時空間分布計測による乱流構造の把握, 日本建築学会環境系論文集, 76, 656, 877-883, 2010.10. |
| 589. | Yamauchi,A., Tanimoto,J., Hagishima,A., An analysis of network reciprocity in Prisoner’s Dilemma games using Full Factorial Designs of Experiment, BioSystems, http://dx.doi.org/10.1016/j.biosystems.2010.10.006, 103, 85-92, 2010.10, [URL]. |
| 590. | Kokubo,S., Tanimoto,J., Hagishima,A., A new Cellular Automata Model including a decelerating damping effect to reproduce Kerner’s three-phase theory, Phyisica A, http://dx.doi.org/10.1016/j.physa.2010.10.027, 390, 4, 561-568, 2010.10, [URL]. |
| 591. | Wakiyama,M., Tanimoto,J., Reciprocity phase in various 2×2 games by agents equipped with 2-memory length strategy encouraged by grouping for interaction and adaptation, BioSystems, http://dx.doi.org/10.1016/j.biosystems.2010.10.009, 103, 93-104, 2010.10, [URL]. |
| 592. | Aya Hagishima, Ken Ichi Narita, Jun Tanimoto, Investigation on turbulent characteristics within urban canopy layer based on outdoor experiment using fine wire thermocouples, Journal of Environmental Engineering (Japan), 10.3130/aije.75.877, 75, 656, 877-883, 2010.10, [URL], The authors performed a field measurement on the turbulent characteristics of an urban canopy layer over a cubical array using numerous fine thermocouples and nine ultra sonic anemometers. The time and spatially fluctuations of air temperature were discussed comparing the instantaneous velocity under the unstable condition. The result clearly showed that the passage of the microffont of temperature above the canopy, which are correlate the sweep and ejection motions due to a turbulent organized structure (TPS) developed within an inertial sublayer, in contrast, the temperature fluctuation below the canopy height is less sensitive to the TOB.. |
| 593. | 谷本潤,萩島理,諫山由紀子,岩井雄志, 居住者の生活スケジュールの多様性を考慮した包括的ユーティリティデマンド予測手法を適用した集合住宅における熱負荷特性に関する検討, 空気調和･衛生工学会論文集, 161, 35-40, 2010.08. |
| 594. | Nakata,M., Yamauchi,A., Tanimoto,J., Hagishima,A., Dilemma game structure hidden in traffic flow at a bottleneck due to a 2 into 1 lane junction, Physica A, http://dx.doi.org/10.1016/j.physa.2010.08.005, 389, 5353-5361, 2010.08, [URL]. |
| 595. | Tanimoto,J., Hagishima,A., Tanaka,Y., Study of bottleneck effect at an emergency evacuation exit using cellular automata model, Physica A , http://dx.doi.org/10.1016/j.physa.2010.08.032, 389 , 24, 5611-5618, 2010.08, [URL]. |
| 596. | Jun Tanimoto, The effect of assortativity by degree on emerging cooperation in a 2 × 2 dilemma game played on an evolutionary network, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2010.03.020, 389, 16, 3325-3335, 2010.08, [URL], A series of numerical experiments on 2×2 games using a co-evolutionary model, including both networks and strategies, was performed. A relationship between assortativity by degree of the evolved network and emerging cooperation was investigated. In the Prisoner's Dilemma (PD) game class, the evolutionary trajectory for a weak dilemma game favors a network with positive assortative coefficient and easily attains a cooperative situation. A game implemented with a stronger dilemma, however, makes the network very heterogeneous, with a negative assortative coefficient required to solve the dilemma situation. This implies that the dilemma strength in the PD significantly affects the direction adopted by the assortative coefficient during evolutionary processes in the co-evolutionary model.. |
| 597. | Jun Tanimoto, The effect of assortativity by degree on emerging cooperation in a 2 x 2 dilemma game played on an evolutionary network, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 10.1016/j.physa.2010.03.020, 389, 16, 3325-3335, 2010.08, A series of numerical experiments on 2 x 2 games using a co-evolutionary model, including both networks and strategies, was performed. A relationship between assortativity by degree of the evolved network and emerging cooperation was investigated. In the Prisoner's Dilemma (PD) game class, the evolutionary trajectory for a weak dilemma game favors a network with positive assortative coefficient and easily attains a cooperative situation. A game implemented with a stronger dilemma, however, makes the network very heterogeneous, with a negative assortative coefficient required to solve the dilemma situation. This implies that the dilemma strength in the PD significantly affects the direction adopted by the assortative coefficient during evolutionary processes in the co-evolutionary model. (C) 2010 Elsevier B.V. All rights reserved.. |
| 598. | Yamauchi,A, Tanimoto,J., Hagishima,A., What controls network reciprocity in the prisoner’s dilemma game?, BioSystems, http://dx.doi.org/10.1016/j.biosystems.2010.07.017, 102 , 2-3, 82-87, 2010.06, [URL]. |
| 599. | Jun Tanimoto, Atsuo Yamauchi, Does "game participation cost" affect the advantage of heterogeneous networks for evolving cooperation?, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2010.01.033, 389, 11, 2284-2289, 2010.06, [URL], Masuda [N. Masuda, Participation costs dismiss the advantage of heterogeneous networks in evolution of cooperation, Proceedings of the Royal Society B 274 (2007) 1815-1821] reported that a game participation cost (expressed by adding same negative values to all four elements in a 2 × 2 payoff matrix) affects the advantage of heterogeneous networks in the evolution of cooperation. We show that this finding is not always true depending on the features of the network, indicating that participation costs help cooperation in certain situations rather than destroy it. In a weaker dilemma game on a scale free network derived from the Barabasi & Albert algorithm with a larger average degree, game participation cost helps rather than destroy the network reciprocity.. |
| 600. | Jun Tanimoto, Aya Hagishima, Total utility demand prediction system for dwellings based on stochastic processes of actual inhabitants, Journal of Building Performance Simulation, 10.1080/19401490903580767, 3, 2, 155-167, 2010.06, [URL], This article describes a new methodology to calculate the likely utility load profiles (energy such as power, natural gas, space heating and cooling, and other thermal requirements, as well as city water) in a dwelling. This calculation takes into account the behavioural variations of the dwelling inhabitants. The proposed method contains a procedure for cooling load calculations based on a series of Monte Carlo simulations where the heating, ventilating and air conditioning (HVAC) on/off state and the indoor heat generation schedules are varied, time-step by timestep. A data set of time-varying inhabitant behaviour schedules, with a 15-min resolution, generated by the authors in previous studies and validated by a comparison analysis to several field measurement data sets, was integrated into the model. The established model, which is called the total utility demand prediction system, can be applied to, for example, likely estimation of an integrated space maximum requirement, such as the total load of a building or an urban area. In a series of numerical experiments, huge discrepancies were found between the conventional results and those considering the time-varying inhabitant behaviour schedules. In particular, deriving the dynamic state change, of having the HVAC on/off from the inhabitants' schedules, was found to be a significant factor in the maximum cooling and heating loads.. |
| 601. | Tanimoto,J., Hagishima,A, Total Utility Demand Prediction System for dwellings based on stochastic processes of actual inhabitants, Journal of Building Performance Simulation, 2010.04. |
| 602. | Tanimoto,J., Yamauchi,A., Does “game participation cost” affect the advantage of heterogeneous networks for evolving cooperation?, Physica A, http://dx.doi.org/10.1016/j.physa.2010.01.033, 389, 2284, 2284-2289, 2010.04. |
| 603. | 脇山宗也,谷本潤, 2記憶長戦略2×2ゲームにおける対戦及び戦略適応のローカリティが創発する互恵相に付与する影響, 情報処理学会研究報告.2010-ICS-158, 2010-ICS-158, #5, 2010.04. |
| 604. | Tanimoto,J., Effect of assortativity by degree on emerging cooperation in a 2 x 2 dilemma game played on an evolutionary network, Physica A, http://dx.doi.org/10.1016/j.physa.2010.03.020, 2010.04. |
| 605. | Makoto Nakata, Atsuo Yamauchi, Jun Tanimoto, Aya Hagishima, Dilemma game structure in traffic flow brought by a bottleneck, Proc. of 13th Asia-Pacific Workshop on Intelligent Evolutionary Systems, 2009.12. |
| 606. | Atsuo Yamauchi, Jun Tanimoto, Aya Hagishima, Factorial analysis on network reciprocity in Prisoner’s Dilemma Game, Proc. of 13th Asia-Pacific Workshop on Intelligent Evolutionary Systems, 2009.12. |
| 607. | Jun Tanimoto, Atsuo Yamauchi, Game participation cost brakes the advantage of heterogeneous networks for evolving cooperation, Proc. of 13th Asia-Pacific Workshop on Intelligent Evolutionary Systems, 2009.12. |
| 608. | Tanioto,J., The effect of assortative mixing on emerging cooperation in an evolutionary network game, 2009 IEEE Congress on Evolutionary Computation, 487-493, 2009.5., 2009.09. |
| 609. | Aya Hagishima1 , Jun Tanimoto1, Koji Nagayama1 and Sho Meno1, Aerodynamic Parameters of Regular Arrays of Rectangular Blocks with Various Geometries, Boundary-Layer Meteorology, 132 , 315-337 , 2009., 2009.09. |
| 610. | 谷本潤,萩島理, 階層型ニューラルネットワークを適用した住宅における冷房開始確率モデルの構築, 日本建築学会環境系論文集, 74 (642), pp.937-942, 2009.8., 2009.08. |
| 611. | 岩井雄志,谷本潤,萩島理, 居住者の生活スケジュールの多様性を考慮した包括的ユーティリティデマンドの予測手法を適用した集合住宅における熱負荷特性に関する基礎的検討, 空気調和･衛生工学会論文集 , No.149，pp.59-63，2009.8., 2009.08. |
| 612. | Tanimoto,J., Hagishima,A;, Total utility demand prediction based on probabilistically generated behavioral schedules of actual inhabitants, 11th IBPSA Conference, 2009.08. |
| 613. | 中田真, 山内敦雄, 谷本潤, 萩島理, 2車線合流狭窄部のボトルネックにおける交通流動相に観る数理ジレンマゲーム構造, 日本ソフトウェア科学会 ネットワークが創発する知能研究会 論文集（JWEIN09）, （JWEIN09）, 2009.08. |
| 614. | 山内敦雄, 谷本潤, 萩島理, 何が囚人のジレンマゲームにおけるネットワーク互恵を左右しているのか？, 日本ソフトウェア科学会 ネットワークが創発する知能研究会 論文集（JWEIN09）, （JWEIN09）, 2009.08. |
| 615. | 谷本潤, 山内敦雄, ヘテロネットワークにおけるゲーム参加コストは本当に協調を破壊するか？, 日本ソフトウェア科学会 ネットワークが創発する知能研究会 論文集（JWEIN09）, （JWEIN09）, 2009.08. |
| 616. | Jun Tanimoto, Aya Hagishima, A stochastic model to predict off/on cooling schedule in dwellings applied by multilayered neural network, Journal of Environmental Engineering (Japan), 10.3130/aije.74.937, 74, 642, 937-942, 2009.08, [URL], In our previous study (Tanimoto & Hagishima (2005), Energy and Buildings 37), a set of state transition probabilities for the Markov Chain dealing with on/off cooling schedule in dwellings was proposed. Obtained probability of turning on an air conditioning system was defined in a form of Sigmoid-function by indoor globe temperature. Obviously, a real stochastic event of shifting from the off to on state cannot be affected by only indoor environmental parameters but also by other complex factors such as presence probability of family members, time, either weekday or holiday etc. In this paper, we report an alternative model based on the Multilayered Neural Network to predict off/on cooling schedule. We gathered field measurement data on familial dwellings during summer 2008 by deploying handy type hygrothermal meters with self-recording functions to measure room air, globe and blow-off air temperature of an air conditioner. The assumed Multilayered Neural Network has 9 nodes in both input and hidden layers, and 1 single node in output layer implying either state shifting from off toon (1) or not (0). The information given to the input layer nodes consists of what time, whether weekday of holiday, presence probability of inhabitants and PPD (Predicted Percentage of Dissatisfied). PPD derived from the theory of PMV is applied as a representative parameter for the indoor environment instead of globe temperature, since it contains various influences. The field measurement data sets were divided into two parts: teaching data and data for validation. The model trained by the teaching data was confirmed to reproduce state transition characteristic of the validation period, which seems complex and is determined by various inhabitants' manners. The model performance to reproduce is observed much excellent than the previous model derived from the Markov Chain.. |
| 617. | J. T. Oliveira, Aya Hagishima, Jun Tanimoto, Estimation of passive cooling efficiency for environmental design in Brazil, Energy and Buildings, 10.1016/j.enbuild.2009.02.006, 41, 8, 809-813, 2009.08, [URL], An estimation of passive cooling techniques was conducted for 14 cities in Brazil, using a fairly accurate algorithm that accounts for heat conduction, convection, radiation, and evaporation; this was done to determine the amount of heat gain/loss of room air, defined as a particular quantitative index for passive techniques. Heat gains and losses were calculated for four envelope conditions - namely, insulated, high-albedo, wet surface, and a combination of the previous two - and compared to a case assumed to be the standard condition. A conclusion drawn was that a passive design is efficient in decreasing the need for cooling in typical dwellings in Brazil; solutions should differ with regional climate characteristics. In semi-arid areas, evaporative cooling showed the best results. Reduced heat gain was found during the warm seasons for all cities, along with increased heat gain during the cool seasons for mid-latitude cities. In particular, a combination of high-albedo enveloping and evaporation can greatly decrease heat gain in building walls. High-albedo surfaces in the sub-tropical areas found in southern Brazil are more efficient. It is suggested that passive techniques should be conceived in such a way so as to work during the cooling season and be disabled during mild ones.. |
| 618. | Oliveira,J.T., Hagishima, A., Tanimoto,J., Estimation of passive cooling efficiency for environmental design in Brazil,, Energy and Buildings , 41, 809-813, 2009., 2009.07. |
| 619. | (谷本潤,萩島理, 田中尉貴, 避難口のボトルネック効果に関するマルチエージェントシミュレーションと平均場近似に基づく解析, 日本建築学会環境系論文集, 74 (640), pp.753-757, 2009.06. |
| 620. | Jun Tanimoto, Aya Hagishima, Yasutaka Tanaka, A study on the bottleneck effect observed in an emergency evacuation exit employed by multi-agent simulation and mean-field approximation analysis, Journal of Environmental Engineering (Japan), 10.3130/aije.74.753, 74, 640, 753-757, 2009.06, [URL], An improved cellular automaton model based on Yanagjsawa & Tomoeda , Nishinari (2007) was established, where both Static Floor Field and collision effect were considered Several model parameters were carefully determined by going through a turning process based on experimental data provided by other previous studies. Both results by simulation based on the model and analytical approach derived from the so-called Mean-Field Approximation proved that the outflow rate from an evacuation exit, usually estimated by the so-called flow coefficient, can be improved by putting appropriate obstacles in front of the exit This is because the appropriate allocation of obstacles can deflate collision probability at the exit by increasing collisions around the obstacles before the exit.. |
| 621. | 谷本潤,萩島理,岩井雄志,諌山由紀子, 居住者の生活スケジュールの多様性を考慮した包括的ユーティリティデマンド予測手法の構築, 日本建築学会環境系論文集 , 74 (639), pp.579-586, 2009.05. |
| 622. | Yamauchi,A., Tanimoto,J., Hagishima,A. Sagara,H., Dilemma Game Structure Observed in Traffic Flow at a 2-to-1 Lane Junction, Physical Review E, 79 , #036104, 2009.05. |
| 623. | Jun Tanimoto, Aya Hagishima, Takeshi Iwai, Yukiko Isayama, Total utility demand prediction considering variation of occupants' behavior schedules, Journal of Environmental Engineering (Japan), 10.3130/aije.74.579, 74, 639, 579-586, 2009.05, [URL], A holistic numerical model to predict total utility demand such as thermal requirement, various energies, domestic hot water, and city water of a residential house or a set of dwellings like a residential building, a residential area and even a city was established, which we call Total Utility Demand Prediction System (TUD-PS). The system based on the methodology for generating actual inhabitants' behavior schedules with 15 minutes time-resolution, previously reported, and a dynamic thermal load calculation. The latter part of the model takes account into the probabilistic model for HVAC turning On/ Off events derived from the Markov Chain, also previously developed, which can realize to obtain probabilistic thermal requirement impacted by inhabitants' On/ Off behaviors. Simulation concerned on seasonal and peak loads for a single dwelling reveals that the so-called maximum load is phenomenally influenced by the assumption whether HVAC turning On/ Off events are probabilistic or deterministic. Hence, a spatial accumulated time-series of utility demands of respective dwellings must be predicted by the proposed model, where simultaneous dynamics of respective dwellings can be reproduced, at least, must not be applied a conventional and practical method where you predict a holistic demand by superposition of a demand at a typical and ideal dwelling.. |
| 624. | Jun Tanimoto, A simple scaling of the effectiveness of supporting mutual cooperation in donor-recipient games by various reciprocity mechanisms, BioSystems, 10.1016/j.biosystems.2008.11.004, 96, 1, 29-34, 2009.04, [URL], In donor-recipient games (DRG), one of the sub-classes of Prisoner's Dilemma (PD), it is well-known that a game structure is described by two parameters benefit (b) and cost (c) of cooperation. By means of a series of numerical experiments, we proved that the effectiveness of supporting mutual cooperation in DRG by various reciprocity mechanisms can be expressed in a single game structural parameter, b/c. This also implies that the dilemma strength in various donor-recipient games with various reciprocity mechanisms can be evaluated only by b/c, which is consistent with the previous novel finding by Nowak. It was also discussed whether this kind of parameterization idea can be extended to general games in PD game class.. |
| 625. | Tanimoto,J., A simple scaling of the effectiveness of supporting mutual cooperation in donor-recipient games by various reciprocity mechanisms, BioSystems, 2009.03. |
| 626. | Tanimoto,J., Promotion of cooperation through co-evolution of networks and strategy in a 2 x 2 game, Physica A, 2009.03. |
| 627. | Atsuo Yamauchi, Jun Tanimoto, Aya Hagishima, Hiroki Sagara, Dilemma game structure observed in traffic flow at a 2-to-1 lane junction, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.79.036104, 79, 3, 2009.03, [URL], Using a cellular automaton traffic model based on the stochastic optimal velocity model with appropriate assumptions for both incoming and outgoing vehicle boundaries, the so-called bottleneck issue on a lane-closing section was investigated in terms of game theory. In the system, two classified driver agents coexist: C agents (cooperative strategy) always driving in the first lane and D agents (defective strategy) trying to drive in a lower-density lane whether the first or the second lane. In high-density flow, D agents' interruption into the first lane from the second just before the lane-closing section creates a heavier traffic jam, which reduces social efficiency. This particular event can be described with a prisoner's dilemma game structure.. |
| 628. | Jun Tanimoto, Promotion of cooperation through co-evolution of networks and strategy in a 2 × 2 game, Physica A: Statistical Mechanics and its Applications, 10.1016/j.physa.2008.11.023, 388, 6, 953-960, 2009.03, [URL], A 2×2 game model implemented by co-evolution of both networks and strategies is established. An existing link between two agents is killed through network adaptation, which then establishes a new link to replace it. Strategy is defined as an offer of "cooperation" (C) or "defection" (D) by an agent. Both networks and strategies are synchronously renovated in each simulation time step. After killing the link with the most disadvantageous neighbor, we consider network adaptations that involve rewiring to (1) a randomly selected agent, (2) a proportionally selected agent (through a roulette selection process based on the degrees of respective agents), (3) an agent randomly selected among a set of neighbors of the neighbors, excluding the most disadvantageous neighbor. Several numerical experiments considering various 2×2 game classes, including Prisoner's Dilemma (PD), Chicken, Leader, and Hero, reveal that the proposed co-evolution mechanism can solve dilemmas in the PD game class. The result of solving a dilemma is the development of mutual-cooperation reciprocity (R reciprocity), which arises through the emergence of several cooperative hub agents, which have many links in a heterogeneous and assortative social network. However, the co-evolution mechanism seems counterproductive in the case of the Leader and Hero game classes, where alternating reciprocity (ST reciprocity) is more demanding. It is also suggested that the assortative and cluster coefficients of a network affect the emergence of cooperation for R reciprocity.. |
| 629. | Aya Hagishima, Jun Tanimoto, Koji Nagayama, Sho Meno, Aerodynamic parameters of regular arrays of rectangular blocks with various geometries, Boundary-Layer Meteorology, 10.1007/s10546-009-9403-5, 132, 2, 315-337, 2009, [URL], The aerodynamic effects of various configurations of an urban array were investigated in a wind-tunnel experiment. Three aerodynamic parameters characterising arrays - the drag coefficient (Cd), roughness length (zo) and displacement height (d) - are used for analysis. Cd is based on the direct measurement of the total surface shear using a floating element, and the other two parameters are estimated by logarithmic fitting of the measured wind profile and predetermined total drag force. The configurations of 63 arrays used for measurement were designed to estimate the effects of layout, wind direction and the height variability of the blocks on these parameters for various roughness packing densities. The results are summarised as follows: (1) The estimated Cd and zo of the staggered arrays peak against the plan area index (λp) and frontal area index (λf), in contrast with values for the square arrays, which are less sensitive to λp and λf. In addition, the square arrays with a wind direction of 45° have a considerably larger Cd, and the wind direction increases zo/H by up to a factor of 2. (2) The effect of the non-uniformity of roughness height on zo is more remarkable when λf exceeds 20%, and the discrepancy in zo is particularly remarkable and exceeds 200%. (3) The effect of the layout of tall blocks on Cd is stronger than that of short blocks. These results indicate that the effects of both wind direction and the non-uniformity of the heights of buildings on urban aerodynamic parameters vary greatly with λp and λf; hence, these effects should be taken into account by considering the roughness packing density.. |
| 630. | Jun Tanimoto, The effect of assortative mixing on emerging cooperation in an evolutionary network game, 2009 IEEE Congress on Evolutionary Computation, CEC 2009 2009 IEEE Congress on Evolutionary Computation, CEC 2009, 10.1109/CEC.2009.4982985, 487-493, 2009, [URL], A series of numerical experiments using a co-evolutionary model for both networks and strategies for 2 - 2 games was carried out. It was proven that there was an interesting relation between assortative mixing of the evolved network and emerging cooperation. In the Prisoner's Dilemma (PD) game class, the evolutionary trail for a weak dilemma game leads to an assortative mixing network, and attains cooperative situation easily. A game implemented with a stronger dilemma, however, makes the network very heterogeneous, featuring a negative assortative coefficient to solve the dilemma situation. This implies that the dilemma strength in PD significantly affects the direction the assortative coefficient takes during evolutionary processes in theco-evolution model.. |
| 631. | Jun Tanimoto, Aya Hagishima, Total utility demand prediction based on probabilistically generated behaviroal schedules of actural inhabitants, 11th International IBPSA Conference - Building Simulation 2009, BS 2009 IBPSA 2009 - International Building Performance Simulation Association 2009, 521-528, 2009, This paper describes a new methodology in calculating accurately the time series utility loads (energy, power, city water, hot water, etc.) in a dwelling. This calculation takes into account the behavioral variations of the dwelling inhabitants. The proposed method contains a procedure for cooling load calculations based on a series of Monte Carlo simulations where the HVAC on/off state and the indoor heat generation schedules are varied, time-step by time-step. A data set of time-varying inhabitant behavior schedules, with a 15 minute resolution, generated by the authors in previous studies and validated by a comparison analysis to several field measurement data sets, was integrated into the model. The established model, which is called the Total Utility Demand Prediction System (TUD-PS) can be applied to, for example, accurate estimation of an integrated space maximum requirement, such as the total load of a building or an urban area. In a series of numerical experiments, huge discrepancies were found between the conventional results and those considering the time-varying inhabitant behavior schedules. In particular, deriving the dynamic state change, of having the HVAC on/off from the inhabitant's schedules, was found to be a significant factor in the maximum cooling and heating loads.. |
| 632. | 岩井雄志,谷本潤,相良博喜,萩島理, エネルギー計算に用いる生活スケジュールに関する研究第8報－2005年度版データに基づく生活スケジュールデータの生成, 空気調和･衛生工学会論文集, No.136，pp.43-46, 2008.11. |
| 633. | 萩島理,谷本潤,末永啓,池谷直樹,前田一行,成田健一, 直方体粗度群の床面バルクスカラー係数に関する風洞模型実験, 日本建築学会環境系論文集, 73 (632), pp.1225-1231, 2008.11. |
| 634. | 田中尉貴，谷本潤，萩島理，脇山宗也, 避難路ボトルネック問題に関する一考察, 第14回交通流のシミュレーションシンポジウム, 2008.11. |
| 635. | Aya Hagishima, Jun Tanimoto, Satoru Suenaga, Naoki Ikegaya, Kazuyuki Maeda, Ken Ichi Narita, Wind tunnel experiment on bulk scalar coefficient of urban-like roughness, Journal of Environmental Engineering (Japan), 10.3130/aije.73.1225, 73, 632, 1225-1231, 2008.10, [URL], The authors investigated bulk scalar coefficient (CE) of the street in the 3-D canopy with various conditions of arrangement, plan area density (λp), frontal area index (λf), and variability of model height in a wind tunnel using salinity method. The results can be summarized as follows. 1) The relationships between CE and lf of both staggered and normal arrayed canopy with uniform height shows different tendency. The CE of 3-D canopy of staggered and normal pattern have similar value under the sparse (λf) and dense conditions, in contrast, CE of staggered canopy is higher than that of normal canopy under the condition of λf = 17.4%. 2) CE of uniform canopy is larger than that of canopy with height variation under the condition of λf E of uniform canopy is smaller than that of canopy with height variation under the condition of λf = 30.9%. Such a tendency is opposite to the result of drag force coefficient.. |
| 636. | 岩井雄志,谷本潤,相良博喜,萩島理, エネルギー計算に用いる生活スケジュールに関する研究第8報－2005年度版データに基づく生活スケジュールデータの生成, 空気調和･衛生工学会論文集, No.136, 2008.07. |
| 637. | Tanimoto, J., What initially brought about communications?, BioSystems, 92 (1) , 82-90, 2008.06, [URL]. |
| 638. | 脇山宗也,谷本潤,相良博喜,萩島理, 社会構造が持続可能型社会創発可能性に及ぼす影響 外生的資源制約を課した環境ジレンマゲームの普遍モデルに関する研究その２, 日本建築学会環境系論文集, №619，pp -, 2008.06. |
| 639. | Hagishima, A., Tanimoto J., Wind tunnel experiment in drag force coefficient of urban-like roughness with height variation, Proc of AWAS 2008, 2008.06. |
| 640. | Tanimoto,J., Co-evolution Model of Networks and Strategy in a 2 × 2 Game Emerges Cooperation, IEEE World Congress on Computational Intelligence, 117-122, 2008.06. |
| 641. | Motoya Wakiyama, Jun Tanimoto, Hiroki Sagara, Aya Hagishima, A research on the universal model of environmental dilemma game based on 2x2 game constrained with the exogenous resource restriction An influence of the social network on emerging possibility of the sustainable society part 2, Journal of Environmental Engineering (Japan), 10.3130/aije.73.831, 73, 628, 831-838, 2008.06, [URL], A universal model for the Environmental Dilemma Game is established. The model has two features. The first point is that the influence of the environment is treated as an exogenous resource restriction that has own dynamics, which is different from 2-players Chicken game or Tragedy of Commons (JV-players Chicken game). The second point is that the game playing among agents is based on various 2x2 games, not a particular game specifically aiming at a certain environmental problem. A series of simulations reveals that a sustainable strategy allowing behavior-shifting to adjust environmental capability has been evolved in several game structures. However, in most game structures, dangerous strategies always trying to obtain resources has been prevailed. Social locality affects to support emerging a sustainable society in some game structure, but in another game structure it devastates existing sustainable society.. |
| 642. | Tanimoto, J., Emergence of cooperation in patchy habitat with mortality and colonization based on various 2 x 2 games, Sociobiology , 52 (2), 185-206, 2008.05. |
| 643. | Tanimoto,J., Hagishima,A., Sagara,H., Validation of Methodology for Utility Demand Prediction Considering Actual Variations in Inhabitant Behavior Schedules, Journal of Building Performance Simulation, 1 (1), 2008.04. |
| 644. | 谷本潤, 2×2対称ゲームにおけるネットワークと戦略共進化に基づくジレンマ解消について, 日本応用数理学会論文誌, １８ (1)、p.17-27, 2008.04. |
| 645. | Jun Tanimoto, Aya Hagishima, Hiroki Sagara, A methodology for peak energy requirement considering actual variation of occupants' behavior schedules, Building and Environment, 10.1016/j.buildenv.2006.06.034, 43, 4, 610-619, 2008.04, [URL], A novel methodology to accurately estimate the cooling demand in residential units is proposed, as a means of providing a better assessment of urban heat-island effects attributable to the use of residential air-conditioning units. The methodology integrates probabilistic variations in occupant behavior, which is shown to be a significant factor in estimated residential cooling requirements. The methodology consists of two key features. The first is an algorithm that generates short-term events that are likely to occur in a residential context, based on published data on occupant behavior. The second is a Monte Carlo approach to cooling load calculations based on stochastic variations in these short-term events and in the consequent likelihood of switching air-conditioning on or off.. |
| 646. | Aya Hagishima, Ken Ichi Narita, Hirofumi Sugawara, Jun Tanimoto, Field measurement on distribution of convective heat transfer coefficient within a real-scale urban canopy, Journal of Environmental Engineering (Japan), 10.3130/aije.73.511, 73, 626, 511-518, 2008.04, [URL], A field measurement on thermal balance and flow characteristics of a full-scale 2D canopy was done, and following phenomena were observed. 1) Air temperature distribution and sensible heat flux of canopy surfaces show the high irregularity due to the sunshade. 2) Linear relationships exist between wind speed Uim and convective heat transfer coefficient (CHTC) of most measurement points. The linear regressions of SAT meters fixed on a leeward wall show similar tendency, in contrast those on a windward wall vary with the position. This tendency is consistent with those of former wind tunnnel experiments. 3) CHTCs of walls deduced from measurement result of surface thermal balance show different tendency of those of SAT meters. It may be caused by the effect of the unhomogeneous temperature distribution of canopy.. |
| 647. | Jun Tanimoto, What initially brought about communications?, BioSystems, 10.1016/j.biosystems.2007.12.001, 92, 1, 82-90, 2008.04, [URL], This paper reports an intelligent agent equipped with two-layer finite state machines (FSMs) that can communicate by turning lighting on and off, leading to social cooperation that solves the dilemma situation, modeled by a one-shot 2 × 2 game. This communication between two gaming agents can be observed in hero- and leader-type dilemma games, where alternating reciprocity, repeating cooperation (C)-defeat (D) after D-C, is the equal pareto optimum instead of a sequence of mutual cooperation that is the equal pareto optimum for a prisoner's dilemma (PD) game.. |
| 648. | Jun Tanimoto, Aya Hagishima, Hiroki Sagara, Validation of methodology for utility demand prediction considering actual variations in inhabitant behaviour schedules, Journal of Building Performance Simulation, 10.1080/19401490701868471, 1, 1, 31-42, 2008.01, [URL], A data set of myriad and time-varying inhabitant behaviour schedules with a 15-min time resolution, generated by the authors in a previous study, is validated through a comparison analysis. The key idea of generating a set of raw schedule data from the restricted statistical information is called the ‘generate and kill’ concept, which is commonly used in the fields of artificial intelligence and multi-agent simulation. In the present study, we show three comparisons. The first and second compare the estimated demand with a time series of measured utility demand. These comparisons indicate that the generated data and the algorithm, as described by the authors, have the required robustness. Another comparison between the estimate and the annually averaged daily water demand of a residential area, consisting of 9327 residences, also shows an acceptable consistency.. |
| 649. | Jun Tanimoto, Co-evolution model of networks and strategy in a 2 × 2 game emerges cooperation, 2008 IEEE Congress on Evolutionary Computation, CEC 2008 2008 IEEE Congress on Evolutionary Computation, CEC 2008, 10.1109/CEC.2008.4630785, 117-122, 2008, [URL], A 2×2 game model implemented by co-evolution of both networks and strategies Is established. Several numerical experiments considering various 2×2 game classes, including Prisoner's Dilemma (PD), Chicken, Leader, and Hero, reveal that the proposed co-evolution mechanism can solve dilemmas in the PD game class. The result of solving a dilemma is the development of mutual-cooperation reciprocity (R reciprocity), which arises through the emergence of several cooperative hub agents, which have many links in a heterogeneous and assortative social network. However, the co-evolution mechanism seems counterproductive in case of the Leader and Hero game classes, where alternating reciprocity (ST reciprocity) is more demanding. It is also suggested that the assortative and cluster coefficients of a network affect the emergence of cooperation for R reciprocity.. |
| 650. | Jun Tanimoto, Emergence of cooperation in patchy habitat with mortality and colonization based on various 2 × 2 games, Sociobiology, 52, 1, 185-206, 2008, A multi-agent simulation model emulating the dynamic processes of an animal species' patchy habitat with mortality and colonization was established. The model, revised from Zhang et al. (2005), can deal with a variety of 2 × 2 game structures including the Prisoner's Dilemma (PD). When a higher mortality is assumed, the defect-agent fraction considerably decreases in a game structure with heavy dilemma (including the PD). This is because agents try to survive by forming cooperative clusters (C-cluster) to overcome the dilemma. This implies that cooperation easily emerges when the mortality process is more influential on the agent's adaptation than colonization, which seems consistent with Hauert's (2006) study. This situation increases the fraction of cooperative agents against the empty fraction in a larger number of link structures, which can easily build a C-cluster.. |
| 651. | Jun Tanimoto, Aya Hagishima, Hiroki Sagara, Validation of probabilistic methodology for generating actual inhabitants' behavior schedules for accurate prediction of maximum energy requirements, Energy and Buildings, 10.1016/j.enbuild.2007.02.032, 40, 3, 316-322, 2008, [URL], A data set of myriad and time-varying inhabitant-behavior schedules with a 15 min time resolution, generated by the authors in a previous study, is validated through a comparison analysis. We show three comparisons. The first and second compare the estimated demand with a time series of actual utility demand. The comparisons indicate that the generated data and its algorithm, described by the authors, have an appropriate robustness. Another comparison between the estimate and the annual averaged daily water demand of a residential area, consisting of 9327 residences, also shows an acceptable consistency.. |
| 652. | Tanimoto,J., Dilemma-solving effects by the coevolution of both networks and strategy in a 2 x 2 game, Physical Review E, 2007.12. |
| 653. | 池谷直樹,谷本潤,萩島理,相良博喜, マルチエージェント･シミュレーションに基づく都心部における人口分布の過渡的動態モデルに関する研究, 日本建築学会技術報告集 , No.26, 2007.12. |
| 654. | Naoki Ikegaya, Jun Tanimoto, Aya Hagishima, Hiroki Sagara, A study on multi-agent simulation model for transient dynamics and distribution of the population in an urban area, AIJ Journal of Technology and Design, 10.3130/aijt.13.845, 13, 26, 845-848, 2007.12, [URL], In order to reproduce both transient dynamics and space distribution of an urban population only derived from a simple self-organism principle, a multi-agent simulation model is established. A resident agent tries to move to a cell so as to maximize his own utility that is defined by both effects of distance from the urban central and population density. The so-called "doughnut phenomenon" as well as growing Densely Inhabited District (DID) can be emulated qualitatively, even though the model bases on a simple self-organism rule.. |
| 655. | Jun Tanimoto, Emergence of cooperation supported by communication in a one-shot 2 × 2 game, 2007 IEEE Congress on Evolutionary Computation, CEC 2007 2007 IEEE Congress on Evolutionary Computation, CEC 2007, 10.1109/CEC.2007.4424631, 1374-1381, 2007.12, [URL], This paper reports an intelligent agent equipped with 2-layer finite state machines (FSM) that can communicate by turning lighting on and off, leading to social cooperation that solves the dilemma situation, modeled by a one-shot 2 × 2 game. This communication between two gaming agents can be observed in Hero- and Leader-type dilemma games, where alternating reciprocity, repeating cooperation (C)-defeat (D) after D-C, is the equal Pareto Optimum instead of a sequence of mutual cooperation that is the equal Pareto Optimum for a Prisoner's Dilemma (PD) game. This implies that what initially brought about animal communications is not the dilemma situation emulated by PD, but a Hero or Leader type game.. |
| 656. | Tanimoto,J., Promotion of cooperation by payoff noise in a 2 × 2 game, Physical Review E , 76, #041130, 2007.11, [URL]. |
| 657. | Sagara,H., Tanimoto,J., Analysis of Impact of Communication Among Different Norms in Norm Reputation Model, Proc. of 11th Asia-Pacific Workshop on Intelligent Evolutionary Systems, 2007.11. |
| 658. | Hagishima. A., Narita. K., Tanimoto. J., Field experiment on transpiration from isolated urban plants, Hydrological Process , 21, 1217-1222, 2007.11, [URL]. |
| 659. | Jun Tanimoto, A study of indirect reciprocity involving a reputation system or a simple tag system in a one-shot, multi-player game, BioSystems, 10.1016/j.biosystems.2007.05.002, 90, 3, 856-869, 2007.11, [URL], The possibility of the evolution of cooperation backed by indirect reciprocity (IDR) in a one-shot, multi-player game is investigated focusing on two mechanisms. First of all, the reputation system with image score (RS with IS), as proposed by Nowak and Sigmund [Nowak, M.A., Sigmund, K., 1998. Evolution of indirect reciprocity by image scoring. Nature 393, 573-577], is investigated in various game structures. A numerical experiment demonstrates that the RS with IS is a robust mechanism for the support of IDR in various dilemma games, but whose effectiveness decreases with an increase in the number of players in a game. It is fair to say that the RS is an information mapping function to relate between player's cooperative fraction on his action and IS. As the second mechanism, a simple tag system which could be applicable to animals having no cognitive complexity is considered to support IDR. Computer simulations of the tag system's strategy for invading a population initially consisting of AllD, AllC, and Random strategies suggest several novel facts. The Tag strategy with plausible crossover and mutation probabilities can only invade to settle down if the game structure is not Trivial and contains a moderate dilemma. The Tag strategy's evolutionary competition takes place mainly in the presence of the AllD strategy. During the competition, the Tag strategy frequently metamorphoses to shake off the AllD strategy, but stops after winning in order to avoid a shrinking payoff due to fragmentation.. |
| 660. | Jun Tanimoto, Hiroki Sagara, A study on emergence of alternating reciprocity in a 2 × 2 game with 2-length memory strategy, BioSystems, 10.1016/j.biosystems.2007.03.001, 90, 3, 728-737, 2007.11, [URL], It is recognized that bilateral cooperation (C), a reward-state in other words, emergently comes up in a 2 × 2 prisoner's dilemma game, if you assume a strategy set with a memory concept. Also observed is a mixture state of cooperation (C) and defect (D), saint- and temptation-state in other words, to obtain a higher payoff than R (R reciprocity) in a hero or leader game that is a chicken-type dilemma game; this phenomenon is called alternating reciprocity (AR) or ST reciprocity. Observing a holistic 2 × 2 game world including trivial games and various dilemma games, where 2-length memory and infinite interactions are assumed, the paper reports on the specific mechanism of AR. It is observed there are three different phases relating to AR, which can be explained by the stress of the dilemma.. |
| 661. | Jun Tanimoto, Differences in Dynamics between Discrete Strategies and Continuous Strategies in a Multi-player Game with a Linear Payoff Structure, BioSystems, 90(2), 568-572, 2007.10, [URL]. |
| 662. | 谷本潤,相良博喜,萩島理,前田哲彦,岩井雄志, エネルギー計算に用いる生活スケジュールに関する研究 第7報－集合住宅における給湯,電力需要時系列実測データとの比較, 空気調和･衛生工学会論文集, No.127, 2007.10. |
| 663. | Jun Tanimoto, Promotion of cooperation by payoff noise in a 22 game, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.76.041130, 76, 4, 2007.10, [URL], A series of numerical simulations of a 22 symmetric game on a network examined whether payoff matrix noise promotes cooperation, as reported initially by Perc [New J. Phys. 8, 22 (2006)]. Agents have no memory (they offer cooperation, C, or defection, D). We assume that the network is time invariable. The effect of payoff matrix noise (PMN) is measured by a simulated payoff difference between a normal network game and a network game with PMN. The effect of PMN appears only when a local strategy adaptation is implemented (for example, a network game with imitation dynamics). The influence of PMN becomes more significant with a larger stochastic deviation, and less significant in a larger degree network. One reason for PMN’s effectiveness is the local strategy adaptation mechanism, which helps both the preservation and fixation of C agents, and not that the payoff matrix noise makes a dilemma game into a Trivial (dilemma-free) game.. |
| 664. | Jun Tanimoto, Aya Hagishima, Hiroki Sagara, A methodology for peak energy requirement considering actual variation of occupants’ behavior schedules, Building and Environment, 43 (4), 610-619, 2007.09, [URL]. |
| 665. | Jun Tanimoto, Aya Hagishima, Hiroki Sagara, Validation of Probabilistic Methodology for Generating Actual Inhabitants' Behavior Schedules for Accurate Prediction of Maximum Energy Requirements, Energy and buildings, 43, 610-619, 2007.09, [URL]. |
| 666. | Jun Tanimoto, A study on emergence of Coordinated Alternating Reciprocity in a 2x2 game with 2-memory length strategy, BioSystems, 2007.09, [URL]. |
| 667. | Jun Tanimoto, Does a Tag System Effectively Support Emerging Cooperation?, Journal of Theoretical Biology, 247(4), 756-764, 2007.09, [URL]. |
| 668. | Tanimoto,J., Hagishima,A., Sagara,H., Validation of the Probabilistic Methodology to Generate Actual Inhabitants’ Behavior Schedules for Accurate Prediction of Maximum Energy Requirement, 10th IBPSA Conference, 2007.09. |
| 669. | Tanimoto,J., Emergence of Cooperation Supported by Communication in a One-Shot 2 x 2 Game, IEEE Congress on Evolutionary Computation 2007, 2007.09. |
| 670. | Sagara,H., Tanimoto,J., A Study on Social Diffusive Impacts of a Novel Car-Navigation-System Sharing Individual Information in Urban Traffic Systems, IEEE Congress on Evolutionary Computation 2007, 2007.09. |
| 671. | 萩島理，谷本潤，永山浩二，古賀正浩, 高さの分布のある直方体粗度群の抗力係数に関する風洞実験，日本建築学会環境系論文集, 日本建築学会環境系論文集, №619, 39-45, 2007.09. |
| 672. | Jun Tanimoto, Differences in dynamics between discrete strategies and continuous strategies in a multi-player game with a linear payoff structure, BioSystems, 10.1016/j.biosystems.2006.12.008, 90, 2, 568-572, 2007.09, [URL], A deductive analysis concerning replicator dynamics proved that a continuous strategy game (in which a player chooses an arbitrary real number between [0, 1] as a cooperative fraction) has the same equilibrium as a discrete strategy game (in which a player chooses only C or D), which has the same linear payoff structure as a continuous strategy game. The deduction is shown for two-player and multi-player games.. |
| 673. | 相良博喜,谷本潤, 2x2ゲームにおけるネットワークと戦略共進化に基づくジレンマの解消について, 情報処理学会研究報告, 2007-ICS-148, 1-8, 2007.08. |
| 674. | Jun Tanimoto, Dilemma solving by the coevolution of networks and strategy in a 2×2 game, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 10.1103/PhysRevE.76.021126, 76, 2, 2007.08, [URL], A 2×2 game model implemented by a coevolution mechanism of both networks and strategy, inspired by the work of Zimmermann and Eguiluz [Phys. Rev. E72, 056118 (2005)] is established. Network adaptation is the manner in which an existing link between two agents is destroyed and how a new one is established to replace it. The strategy is defined as whether an agent offers cooperation (C) or defection (D). Both the networks and strategy are synchronously renovated in a simulation time step. A series of numerical experiments, considering various 2×2 game structures, reveals that the proposed coevolution mechanism can solve dilemmas in several game classes. The effect of solving a dilemma means mutual-cooperation reciprocity (R reciprocity), which is brought about by emerging several cooperative hub agents who have plenty of links. This effect can be primarily observed in game classes of the prisoner's dilemma and stag hunt. The coevolution mechanism, however, seems counterproductive for game classes of leader and hero, where the alternating reciprocity (ST reciprocity) is meaningful.. |
| 675. | Jun Tanimoto, Does a tag system effectively support emerging cooperation?, Journal of Theoretical Biology, 10.1016/j.jtbi.2007.03.033, 247, 4, 756-764, 2007.08, [URL], This paper investigates whether the so-called Tag Systems support emerging cooperation with respect to 2×2 games. The Tag System, initially proposed by Riolo et al. [2001. Evolution of cooperation without reciprocity. Nature 414, 441-443], gives each agent both a Tag and Tol defined by [0,1] real numbers. Tol is a tolerance for recognizing an opponent as a company. Both Tag and Tol are assumed to be evolving. Results show that the tag's effectiveness depends on whether the AllD strategy is allowed in the system. Allowing AllD implies that green beard effect does not work in the system. Thus, (1) the tag's effectiveness is more meager than that reported by Riolo et al., (2) the Tag System can use alternating reciprocity more effectively than the analytic solution in a Hero game; (3) a system using a 2D tag space supports cooperation more effectively than the usual Tag System.. |
| 676. | 谷本潤, 線形な利得構造を有する多人数ゲームにおける離散戦略と連続戦略のダイナミクス, 情報処理学会論文誌, 48(7), 2007.07. |
| 677. | 谷本潤, 線形な利得構造を有する多人数ゲームにおける離散戦略と連続戦略のダイナミクス，情報処理学会論文誌, 情報処理学会論文誌 , 48 (7), 2372-2376, 2007.07. |
| 678. | Jun Tanimoto, Hiroki Sagara, Relationship between dilemma occurrence and the existence of a weakly dominant strategy in a two-player symmetric game, BioSystems, 10.1016/j.biosystems.2006.07.005, 90, 1, 105-114, 2007.07, [URL], Defining the dilemma game by the proposition, A game cannot sustain an increase of cooperation strategy in its strategy distribution, we deduced that the substance of a dilemma can be expressed by a productive summation of the static factor and the dynamic factor independently. A static factor is an element of the game's structure that influences a possible dilemma, which relates to a game's structural deviation from a situation where the cooperation strategy can be weakly dominant over other strategies. In contrast, a dynamic factor refers to a strategy distribution's influence on the dilemma by affecting the game dynamics. In a 2 × 2 game, the existence of a dilemma can be determined only by a static factor. That is, whether or not a dilemma occurs is related only to the structural effect of the game. On the other hand, in a more-than-two-strategies game, both static and dynamic factors determine the occurrence of a dilemma, and the static factor cannot solely explain the occurrence of a dilemma.. |
| 679. | Jun Tanimoto, Hiroki Sagara, Relationship between dilemma occurrence and the existence of a weakly dominant strategy in a two-player symmetric game, BioSystems, 90(1), 105-114, 2007.06, [URL]. |
| 680. | 谷本潤, タグは協調創発に有効か？, 情報処理学会研究報告, 2007-ICS-147，97-102, 2007.06. |
| 681. | 相良博喜，谷本潤, Reputation Systemにおける加罰的Normの創発についての考察, 情報処理学会研究報告, 2007-ICS-147，121-126, 2007.06. |
| 682. | 谷本潤,相良博喜,萩島理,飯尾昭彦, エネルギー計算に用いる生活スケジュールに関する研究 第6報－水･湯消費イベント予測時系列と田中･飯尾氏アンケート調査データとの比較, 空気調和･衛生工学会論文集 , No.123，pp.33-37, 2007.06. |
| 683. | 谷本潤, 間接互恵創発のためのタグモデルに関する考察, 日本計算工学会, No.20070014, 2007.06. |
| 684. | Aya Hagishima, Ken Ich Narita, Jun Tanimoto, Field experiment on transpiration from isolated urban plants, Hydrological Processes, 10.1002/hyp.6681, 21, 9, 1217-1222, 2007.04, [URL], The effect of pot plant density on plant transpiration rate was examined in a series of field experiments. Three spatial densities were crated using 203 nearly homogeneous pot plants; the ratios of plant separation to plant height were 0.25, 0.5, and 3 for the 'high,' 'medium,' and 'low' groups respectively. The daily transpiration rate of 55 pot plants was measured for 28 days. During that period, the plants were randomly rotated each day to statistically eliminate individual characteristics and to successfully ascertain the effect of plant spatial density on the transpiration rate. As a best-case scenario, the soil for each plant was saturated at the start of each experiment. The results showed that the transpiration rate of potted plants in the 'low' group was about 1.5 times greater than that of the 'high' group. On the basis of the transpiration rate per unit of vegetation area projected on a horizontal plain, which is a general index used in meteorological modeling, the plants in the 'low' group evaporated 2.7 times as much water as those in the centre of the 'high' group. These results indicate the need for modified models that can consider the relative increase in evapotranspiration from vegetation in small-size plants or low spatial density of vegetation to estimate latent heat flux in urban areas.. |
| 685. | 相良博喜,谷本潤, 派閥モデルを用いたジレンマゲームにおけるGreen Beard Effectの考察, 情報処理学会研究報告, 2007-ICS-147，103-108, 2007.03. |
| 686. | 谷本潤, One-Shot 2x2ゲームにおけるコミュニケーションに基づく協調の創発, 情報処理学会研究報告, 2007-ICS-147，115-120, 2007.03. |
| 687. | 脇山宗也,谷本潤,相良博喜, 外生的資源制約を課した環境ジレンマゲームに関する研究, 情報処理学会研究報告, 2007-ICS-147，127-132, 2007.03. |
| 688. | Yuemei Zhu, Jing Liu, Aya Hagishima, Jun Tanimoto, Yang Yao, Zuiliang Ma, Evaluation of coupled outdoor and indoor thermal comfort environment and anthropogenic heat, Building and Environment, 10.1016/j.buildenv.2005.10.019, 42, 2, 1018-1025, 2007.02, [URL], With rapid urbanization, big cities in the south of China are progressively falling short of sustaining outdoor thermal comfort. In this paper, a thermal comfort and energy evaluation model is derived from revisions of previous study, to simulate and predict the interaction of coupled urban building-site climate and then the thermal comfort. The methodology of principal calculations is demonstrated first, then a hypothetical district of office buildings in Shanghai is selected. Dynamic on-site climate parameters, anthropogenic heat and indoor/outdoor SET* values, etc., are simulated and evaluated. The results show the variation of outdoor SET* values influenced by factors including canopy height, building coverage and air-conditioning set-point temperature.. |
| 689. | Yuemei Zhu, Jing Liu, Aya Hagishima, Jun Tanimoto, Yang Yao, Zuiliang Ma, Evaluation of coupled outdoor and indoor thermal comfort environment and anthropogenic heat, BUILDING AND ENVIRONMENT, 10.1016/j.buildenv.2005.10.019, 42, 2, 1018-1025, 2007.02, With rapid urbanization, big cities in the south of China are progressively falling short of sustaining outdoor thermal comfort. In this paper, a thermal comfort and energy evaluation model is derived from revisions of previous study, to simulate and predict the interaction of coupled urban building-site climate and then the thermal comfort. The methodology of principal calculations is demonstrated first, then a hypothetical district of office buildings in Shanghai is selected. Dynamic on-site climate parameters, anthropogenic heat and indoor/outdoor SET* values, etc., are simulated and evaluated. The results show the variation. of outdoor SET* values influenced by factors including canopy height, building coverage and air-conditioning set-point temperature. (c) 2005 Elsevier Ltd. All rights reserved.. |
| 690. | Hiroki Sagara, Jun Tanimoto, A study on social diffusive impacts of a novel car-navigation-system sharing individual information in urban traffic systems, 2007 IEEE Congress on Evolutionary Computation, CEC 2007 2007 IEEE Congress on Evolutionary Computation, CEC 2007, 10.1109/CEC.2007.4424557, 836-842, 2007, [URL], As one of the authors' trials to establish a model for human-environment- social Systems, a multi-agent simulation model to deal with urban traffic congestion problems involving automobiles embedded with several strategies of car navigation systems (CNS), has been presented. A shortest time route with route information sharing strategy (ST-RIS) is believed to be one of the solutions for a novel CNS based on bilateral information shared among automobile agents. The question of which strategy is most appropriate for solving urban traffic congestion can be seen as a social dilemma, since the social holistic utility is opposite to each agent's individual utility. The presented model shows that this social dilemma is observed as a typical Chicken type dilemma, or as a typical Minority Game, where an agent who has adopted a minority strategy can earn more utility than other strategies. Consequently, the model has illustrated that ST-pRIS, which is a further advanced strategic form of ST-RIS, where only partial information is shared among agents, has a moderate potential to be diffused in a society from the viewpoint of the evolutionary game theory.. |
| 691. | Yuemei Zhu, Jing Liu, Yang Yao, Zuiliang Ma, Aya Hagishima, Jun Tanimoto, Evaluating the impact of solar radiation on outdoor thermal comfort by the development and validation of a simple Urban climatic model, 2006 International Solar Energy Conference, ISEC2006 Proceedings of the ASME International Solar Energy Conference, ISEC2006, 10.1115/ISEC2006-99012, 515-521, 2007, [URL], In this paper, in order to predict the outdoor thermal environment, a simple multi-layer canopy model coupled with calculation of outdoor thermal comfort was developed. SET* value was used to estimate the pedestrian level of thermal comfort in the outdoor thermal environment. Preliminary verification of this model using observational data on the outdoor thermal conditions showed good results. In addition, the results show that outdoor thermal comfort is significantly different with air temperature. Except for air temperature, both solar radiation and humidity play important roles on outdoor thermal comfort.. |
| 692. | Jun Tanimoto, Aya Hagishima, Hiroki Sagara, Validation of the probabilistic methodology to generate actual inhabitants' behavior schedules for accurate prediction of maximum energy requirement, Building Simulation 2007, BS 2007 IBPSA 2007 - International Building Performance Simulation Association 2007, 696-702, 2007, A data set of myriad and time-varying inhabitant-behavior schedules with a 15-minute time resolution, generated by the authors in a previous study, is validated through a comparison analysis. We show three comparisons. The first and second compare the estimated demand with a time series of actual utility demand. The comparisons indicate that the generated data and its algorithm, described by the authors, have an appropriate robustness. Another comparison between the estimate and the annual averaged daily water demand of a residential area, consisting of 9,327 residences, also shows an acceptable consistency.. |
| 693. | 谷本潤,脇山宗也,相良博喜, 外生的資源制約を課した環境ジレンマゲームの普遍モデルに関する研究, 日本建築学会環境系論文集, No.610, pp.107-112, 2006.12. |
| 694. | 谷本潤,相良博喜, 2人対称ゲームにおけるジレンマ性と弱支配戦略の存在可否性との関連について, 情報処理学会論文誌, 47 (12)，pp.3343-3351, 2006.12. |
| 695. | 谷本潤,相良博喜,萩島理,木内豪,神田学,中山有, エネルギー計算に用いる生活スケジュールに関する研究 第5報 久が原の実給水量データと予測給水デマンドとの比較, 空気調和・衛生工学会論文集, No.113，pp.35-38, 2006.08. |
| 696. | 谷本潤,相良博喜, ゲームダイナミクスの離散表現と連続表現に関する考察, 情報処理学会論文誌, 47 (4)，pp.1166-1170, 2006.06. |
| 697. | 谷本潤,相良博喜,萩島理, エネルギー計算に用いる生活スケジュールに関する研究 第4報 生成データの検証, 空気調和・衛生工学会論文集, No.110，pp.35-41, 2006.05. |
| 698. | 萩島理,谷本潤,浅野文宏, 改良・建築−都市−土壌連成系モデル(AUSSSM)による都市高温化の構造解析 第3報 気象条件による都市高温化要因の違い, 日本建築学会環境系論文集, No.601, pp43-50, 2006.03. |
| 699. | 萩島理,谷本潤,浅野文宏, 改良・建築−都市−土壌連成系モデル(AUSSSM)による都市高温化の構造解析 第3報 気象条件による都市高温化要因の違い, 日本建築学会環境系論文集, No.601, pp43-50, 2006.03. |
| 700. | 谷本潤, 繰り返しなし多人数ゲームにおけるReputationおよびTagによる間接互恵の進化について, 電子情報通信学会技術研究報告, Vol.105 No.509，pp.1-6, 2006.01. |
| 701. | 相良博喜,谷本潤, ネットワーク構造が2x2ゲームに及ぼす影響に関する考察, 電子情報通信学会技術研究報告, Vol.105 No.509，pp.25-31, 2006.01. |
| 702. | 脇山宗也,谷本潤,相良博喜, 外生的資源制約を課した環境ジレンマゲームに関する研究, 電子情報通信学会技術研究報告, Vol.105 No.509，pp.7-14, 2006.01. |
| 703. | Yuemei Zhu, Jing Liu, Yang Yao, Zuiliang Ma, Aya Hagishima, Jun Tanimoto, Evaluating the impact of solar radiation on outdoor thermal comfort by the development and validation of a simple urban climatic model, Solar 2006: Renewable Energy - Key to Climate Recovery, Including 35th ASES Annual Conference, 31st ASES National Passive Solar Conference, 1st ASES Policy and Marketing Conference and ASME Solar Energy Division International Solar Energy Conference American Solar Energy Society - Solar 2006: 35th ASES Annual Conf., 31st ASES National Passive Solar Conf., 1st ASES Policy and Marketing Conf., ASME Solar Energy Division Int. Solar Energy Conference, 3, 1522-1528, 2006, In this paper, in order to predict the outdoor thermal environment, a simple multilayer canopy model coupled with calculation of outdoor thermal comfort was developed. SET* value was used to estimate the pedestrian level of thermal comfort in the outdoor thermal environment. Preliminary veri cation of this model using observational data on the outdoor thermal conditions showed good results. In addition, the results show that outdoor thermal comfort is significantly different with air temperature. Except for air temperature, both solar radiation and humidity play important roles on outdoor thermal comfort.. |
| 704. | Yuemei Zhu, Jing Liu, Yang Yao, Zuiliang Ma, Aya Hagishima, Jun Tanimoto, Evaluating the impact of solar radiation on outdoor thermal comfort by the development and validation of a simple urban climatic model, ASME International Solar Energy Conference - Solar Engineering 2006 Proceedings of the ASME International Solar Energy Conference - Solar Engineering 2006, 2006, 2006, In this paper, in order to predict the outdoor thermal environment, a simple multi-layer canopy model coupled with calculation of outdoor thermal comfort was developed. SET* value was used to estimate the pedestrian level of thermal comfort in the outdoor thermal environment. Preliminary verification of this model using observational data on the outdoor thermal conditions showed good results. In addition, the results show that outdoor thermal comfort is significantly different with air temperature. Except for air temperature, both solar radiation and humidity play important roles on outdoor thermal comfort.. |
| 705. | 萩島 理,谷本潤, 壁面緑化システムの熱収支構造に関する屋外観測, 日本建築学会技術報告集, No.22, 253-258, 2005.12. |
| 706. | Aya Hagishima, Jun Tanimoto, Investigations of urban surface conditions for urban canopy model, Building and Environment, 10.1016/j.buildenv.2004.08.010, 40, 12, 1638-1650, Vol.40(12),pp.1638-1650, 2005.12. |
| 707. | Jun Tanimoto, Aya Hagishima, Cooling Load Simulation Considering Actual Variation of Inhabitants’ Behavior for Accurate Estimation of Urban Maximum Energy Requirement, 9th IBPSA Conference (Building Simulation 2005), 2005.12. |
| 708. | 相良博喜,谷本潤,萩島理, エネルギー計算に用いる生活スケジュールに関する研究 第3報 普遍的データ生成法, 空気調和・衛生工学会論文集, No.105，pp.29-35, 2005.12. |
| 709. | Jun Tanimoto, Haruyuki Fujii, A model for Collusive tendering based on a multiagent approach, Agent-Based Modering Meets Gameing Simulation, Springer-Verlag, 2005, pp.89-100, 2005.12. |
| 710. | Aya Hagishima, Jun Tanimoto, Ken Ich Narita, Intercomparisons of experimental convective heat transfer coefficients and mass transfer coefficients of urban surfaces, Boundary-Layer Meteorology, 10.1007/s10546-005-2078-7, 117, 3, 551-576, 2005.12, [URL], The convective heat transfer coefficient (CHTC) of an urban canopy is a crucial parameter for estimating the turbulent heat flux in an urban area. We compared recent experimental research on the CHTC and the mass transfer coefficient (MTC) of urban surfaces in the field and in wind tunnels. Our findings are summarised as follows. (1) In full-scale measurements on horizontal building roofs, the CHTC is sensitive to the height of the reference wind speed for heights below 1.5 m but is relatively independent of roof size. (2) In full-scale measurements of vertical building walls, the dependence of the CHTC on wind speed is significantly influenced by the choice of the measurement position and wall size. The CHTC of the edge of the building wall is much higher than that near the centre. (3) In spite of differences of the measurement methods, wind-tunnel experiments of the MTC give similar relations between the ratio of street width to canopy height in the urban canopy. Moreover, this relationship is consistent with known properties of the flow regime of an urban canopy. (4) Full-scale measurements on roofs result in a non-dimensional CHTC several tens of times greater than that in scale-model experiments with the same Reynolds number. Although there is some agreement in the measured values, our overall understanding of the CHTC remains too low for accurate modelling of urban climate.. |
| 711. | Aya Hagishima, Jun Tanimoto, Investigations of urban surface conditions for urban canopy model, Building and Environment, 10.1016/j.buildenv.2004.08.010, 40, 12, 1638-1650, 2005.12, [URL], The authors carried out several investigations to clarify the features of urban surface conditions in the urban canopy Model (UCM). The authors first conducted field investigations regarding the solar reflectance of urban surfaces. First, the wall reflectance and the proportion of the glazing area were measured in several urban areas. The relationship between the solar reflectance of road and traffic density is clarified based on the outdoor measurement and the field survey. It is also presented that the reflectance of the building rooftop varies significantly depending on building use and the influence of machinery in the area of the HVAC. The authors secondly investigated the height of released anthropogenic heat from the HVAC system based on a field survey and a database of HVAC systems provided by certain journals. From these investigations, it is presented that the type of HVAC system and the height of released anthropogenic heat vary with the building scale. Finally, an investigation of urban geometric figures was conducted using GIS data from Tokyo and Fukuoka in Japan. The vertical distribution features of both the roughness volume density and the building wall area density were classified according to the gross ratio of building volume.. |
| 712. | 谷本潤, 環境問題への適用のためのジレンマゲームの基本構造に関する考察, 日本建築学会環境系論文集, No.595，pp.135-140, 2005.11. |
| 713. | 谷本潤, n人型ジレンマゲームとして見た環境問題の構造に関する考察, 日本建築学会環境系論文集, No.594，pp.101-107, 2005.08. |
| 714. | (1) 谷本潤,萩島理,シムクライ・パリチャ−ト, 複雑都市形状におけるアルベド解析のための放射計算モデルとそのアプリケーションALBEDO Calculator & Viewerの開発, 日本建築学会技術報告集, No.21, 2005.06. |
| 715. | 萩島理，谷本潤，高園洋行, 環境性能を考慮した建築物の総合評価のための重み決定法に関する諸検討, 日本建築学会環境系論文集, No.587, 2005.05. |
| 716. | Jun Tanimoto and Aya Hagishima, State transition probability forthe Markov Model dealing with on/off cooling schedule in dwellings, Energy and Buildings, 10.1016/j.enbuild.2004.02.002, 37, 3, 181-187, Vol.37 No.3，pp.181-187, 2005.03. |
| 717. | 相良博喜，谷本潤, 記憶長2x2ジレンマゲームにみる“やらせ”に関する考察, 情報処理学会研究報告「知能と複雑系」, 2005-ICS-139, 2005.03. |
| 718. | 相良博喜，谷本潤, n人型社会ジレンマモデルに関する考察, 情報処理学会研究報告「知能と複雑系」, 2005-ICS-139, 2005.03. |
| 719. | 相良博喜，谷本潤, ジレンマゲームにおけるジレンマ性に関する考察, 情報処理学会研究報告「知能と複雑系」, 2005-ICS-139, 2005.03. |
| 720. | Jun Tanimoto, Aya Hagishima, State transition probability for the Markov Model dealing with on/off cooling schedule in dwellings, Energy and Buildings, 10.1016/j.enbuild.2004.02.002, 37, 3, 181-187, 2005.03, [URL], We gathered field measurement data on five familial and three single dwellings during summer 2000 by deploying numerous handy type hygrothermal meters with self-recording functions to measure room air, globe and outdoor air temperatures. These measurements led to conclusions on the probability of turning on an air conditioning system versus indoor globe temperature and the ongoing probability of air conditioning versus outdoor temperature. This analysis was transformed into state transition probability functions, i.e. shifting from the off to on state and from the on to off state. Identifying these state transition probability functions is an important first step in applying the Markov Model to on/off state analysis for air conditioning systems, which is one of the significant approaches for dealing with the stochastic thermal load for HVAC system. The obtained state transition probability functions should help immeasurably in determining effective schedules for air conditioning operation from inhabitant occupancy schedules.. |
| 721. | Hagishima. A.; Tanimoto.J.; Narita.K, Intercomparisons of experimental research on convective heat transfer coefficient of urban surfaces, Boundary-Layer Meteorology, 10.1007/s10546-005-2078-7, 117, 3, 551-576, 117, 551-576, 2005.01. |
| 722. | Jun Tanimoto, Environmental dilemma game to establish a sustainable society dealing with an emergent value system, Physica D, 10.1016/j.physd.2004.09.016, 200, 1-2, 1-24, Vol. 200, pp.1-24, 2005.01. |
| 723. | 谷本潤，萩島理，相良博喜, 街区・都市スケールのエネルギー最大デマンド推定に何を考えるべきか？, IBPSA Japan 論文集, pp.3-10, 2005.01. |
| 724. | 萩島理，谷本潤，前田和成, 木炭を用いたパッシブ調湿システムの性能評価のための数値解析, IBPSA Japan 論文集, pp.209-213, 2005.01. |
| 725. | Jun Tanimoto, Environmental dilemma game to establish a sustainable society dealing with an emergent value system, Physica D: Nonlinear Phenomena, 10.1016/j.physd.2004.09.016, 200, 1-2, 1-24, 2005.01, [URL], To induce whether we can obtain a sustainable society by shifting our paradigm from the materialistic to the eco-conscientious, we established a multi-agent simulation model. The model primarily featured a dilemma structure encouraged by a conflict between each agent's private desire to earn more and the need for environmental conservation. Another important feature is that the model has two evolutionary layers. The subordinate layer is a learning system comprised of a finite state machine (FSM) and a genetic algorithm (GA) primarily, which is carried with each individual agent to determine his/her next behavior and how much he/she must earn to maximize an individual fitness function. The supra layer is the so-called value system, the gene pool of which is shared within the society. The value system stipulates an agent's fitness function, which in turn affects the agent's behavior. The value system of each agent was set up to be entirely ego-oriented at the beginning of the simulation episode. A numerical experiment based on the model reveals a scene in which, under a certain condition related to assumptions of the value system, a group of agents undergoes a paradigm shift from the ego-oriented materialism to the eco-conscious sustainable society. The key condition is a latent existence of several values that ultimately lead to sustainability, even though they do not work at all at the beginning of the episode. In terms of the evolutionary game theory, this implies that changing game structure on the way of a simulation episode by transforming the fitness function seems to be much powerful measures for the emergent collective cooperation among the agents than ordinal options to support cooperation. In addition, we made a detailed analysis on how assumed agents have obtained a sustainable value system. Each agent has an individual decision-making process based on the input with a learning mechanism. We focus here on two types of learning system, the finite state machine (FSM) plus genetic algorithm (GA), and profit shearing (PS). Observation of the generative trails of FSM and the value table of PS lead us to a profound understanding of what kind of inception triggers the emergence of a sustainable society.. |
| 726. | Jun Tanimoto, Aya Hagishima, Hiroki Sagara, Cooling looad simulation considering actual variation of inhabitants' behavior inhabitants' behavior for accurate estimation of urban maximum energy requirement, Building Simulation 2005 - 9th International IBPSA Conference, BS 2005 IBPSA 2005 - International Building Performance Simulation Association 2005, 1205-1212, 2005, A brand-new methodology for considerably accurate time-series cooling load calculation in a dwelling is established, motivated by the fact that dwelling energy requirements so significantly affect the so-called urban heat island. Calculation that takes variation among dwelling-inhabitants' behaviors into consideration appears to be important. The proposed method contains two crucial features. The first is a procedure for cooling load calculation based on a series of Monte Carlo simulations where HVAC on/ off state and indoor heat generation schedule are variable time-step by time-step. The second feature is an algorithm to generate myriad schedule data of each inhabitant's behavior that must be provided with fine time resolution.. |
| 727. | 萩島理，谷本潤，高園洋行, 戸建住宅の選好における環境性能の影響把握のための基礎的検討, 日本建築学会環境系論文集, No.586. pp53-59, 2004.12. |
| 728. | 前田和成，萩島理，谷本潤, 数値計算による炭化物を用いたパッシブ調湿システムに関する検討, 九州大学大学院総合理工学報告, Vol.26,No.2,pp.209-214, 2004.12. |
| 729. | 谷本潤，萩島理，三浦泰久, マルチエージェントシミュレーションに基づく人間−環境−社会システムのモデル化−試論, 日本建築学会環境系論文集, No.586, pp91-97, 2004.12. |
| 730. | P.Chimklai, A.Hagishima,J.Tanimoto, A computer system to support Albedo Calculation in urban areas, Building and Environment,, 10.1016/j.buildenv.2004.02.006, 39, 10, 1213-1221, Vol.39(10),pp1213-1221, 2004.10. |
| 731. | Parichart Chimklai, Aya Hagishima, Jun Tanimoto, A computer system to support Albedo Calculation in urban areas, Building and Environment, 10.1016/j.buildenv.2004.02.006, 39, 10, 1213-1221, 2004.10, [URL], The Albedo Calculation Model (ACM) has been developed to provide the simulation of albedos within three-dimensional urban structures. The model takes into account urban configurations and a change of solar positions, as well as the effects of multiple reflections and shading in an urban canopy. In order to perform a systematic analysis for the effect of various factors on albedo of surfaces, a large scale numerical experiment has been conducted. The model description and experiment results of albedo characteristics are clarified in this paper. In addition, the development of two associated GUI (graphical user interface)-based applications, Albedo Calculator and Albedo Viewer is also introduced.. |
| 732. | 萩島理,谷本潤,成田健一, 都市表面の対流熱伝達率に関する既往研究のレビュー, 水文・水資源学会誌, vol.17 (5),pp.536-544, 2004.09. |
| 733. | 谷本潤，藤井晴行, 我らが将来に持続可能社会はあるか？, 日本建築学会計画系論文集, No,583,pp87-94, 2004.09. |
| 734. | J.Tanimoto; A.Hagishima; P.Chimklai,, An approach for coupled simulation of building thermal effects and urban climatology, Energy and Buildings, 10.1016/j.enbuild.2004.01.019, 36, 8, 781-793, vol 36，pp781-793, 2004.08. |
| 735. | H. Fujii, J. Tanimoto, Integration of building simulation and agent simulation for exploration to environmentally symbiotic architecture?, Building and Environment, 10.1016/j.buildenv.2004.01.013, 39, 8, 885-893, vol 39,pp885-893, 2004.08. |
| 736. | Jun Tanimoto, Aya Hagishima, Parichart Chimklai, An approach for coupled simulation of building thermal effects and urban climatology, Energy and Buildings, 10.1016/j.enbuild.2004.01.019, 36, 8, 781-793, 2004.08, [URL], The computer software AUSSSM TOOL, originating from the methodology of the revised-architectural-urban-soil-simultaneous simulation model (revised-AUSSSM), was developed by adopting the graphical user interface (GUI) features to support users, who can use the interactive computer display for parameter settings, simulating, visualizing, and reporting the numerical calculation results instead of complicated programming. The purpose of the AUSSSM TOOL is to determine quantitative parameters such as air temperature, exhaustive heat from air conditioning systems, energy heat balance, etc. within the urban canopy structure, which data enables the evaluation of effects of urban heat island (UHI) in concrete terms useful to urban planners, architects, engineers, and so forth in the field of urban climatology involving building scale. In addition to conducting a full numerical simulation, in order to simplify a comparison among complex factors influencing UHI, numerical experiments based on Taguchi design of experiment theory (DOE) were carried out. The results of the numerical experiments were stored in a database and ready to be instantly grasped by any inexperienced user corresponding to their specified conditions. This paper describes the fundamental method of the revised-AUSSSM, the objectives of related software development, and the structures of the AUSSSM TOOL and the techniques comprising its algorithm to present the numerical simulation results in particular.. |
| 737. | 谷本潤,藤井晴行, 談合の数理 第３報 社会コンフリクトとしてみた談合のゲーム論的考察, 日本建築学会環境系論文集, No.580，pp93-98, 2004.06. |
| 738. | J.Tanimoto, H. Fujii,, A Multi-Agent Simulation of a Dilemma Game to Establish a Sustainable Society Dealing with an Emergent Value System, 9th Workshop on Economics and Heterogeneous Interacting Agents(WEHIA), CD-ROM, 2004.05. |
| 739. | 萩島理,成田健一,谷本潤,三坂育正,松嶋 篤,尾之上真弓, 大規模な階段状緑化屋根を有する建築物周辺の微気象に関する実測調査, 日本建築学会環境系論文集, No.577，pp.47-54, 2004.03. |
| 740. | 谷本潤，藤井晴行, サステナブル社会に向けた価値観創発のマルチエージェントシミュレーション, 情報処理学会研究報告「知能と複雑系」, 2004-ICS-135,pp43-48, 2004.03. |
| 741. | Haruyuki Fujii, Jun Tanimoto, Integration of building simulation and agent simulation for exploration to environmentally symbiotic architecture, Building and Environment, 10.1016/j.buildenv.2004.01.013, 39, 8 SPEC. ISS., 885-893, 2004.01, [URL], A method of simulating the interaction between architectural environment and human action in the environment is described. The computational model consists of a model for building simulation, a model for action simulation, and a model to mediate the simulation models. This model is being developed to find the environmentally symbiotic actions and the knowledge and beliefs that people are encouraged to acquire to perform such actions. It might not be possible for the majority of traditional simulation to model an occupant as the individual having desire, belief, and intention. The proposed model may provide a solution to complement the disadvantage.. |
| 742. | Aya Hagishima, Jun Tanimoto, Ken Ichi Narita, Comparisons of various experimental results on the convective heat transfer coefficient of urban surfaces, 5th Symposium on the Urban Environment 5th Symposium on the Urban Environment, 647-648, 2004, A comparative study on experimental results obtained on the convective heat transfer coefficients on urban surfaces are discussed. Convective heat transfer coefficient (CHTC) was considered to express the turbulent heat exchange between the atmosphere and urban surfaces. A detailed study on relationship between CHTC of vertical wall of buildings and wind speeds, and CHTC for horizontal building roofs and wind speeds, was also presented. It was observed that position of walls has relatively large influence on CHTC.. |
| 743. | Aya Hagishima, Ken Ichi Narita, Jun Tanimoto, Field experiment on the oasis effect of urban areas using potted plants, 5th Symposium on the Urban Environment 5th Symposium on the Urban Environment, 243-245, 2004, An experimental study, using potted plants was, conducted to estimate the oasis effects of urban areas. The study for 28 days shows that evaporation rate of an isolated plant is one-and-half times larger than that of plant placed in the center of a dense canopy. The experiment was accompanied by noting the evaporation rate of 55 potted plants, arranged at an interval of 3.6 meters. It was observed that evaporation rate increased with an decrease in the vegetation density.. |
| 744. | Jun Tanimoto, Haruyuki Fujii, A study on diffusional characteristics of information on a human network analyzed by a Multi-Agent simulator, Social Science Journal, 10.1016/S0362-3319(03)00045-4, 40, 3, 479-485, 2003.01, [URL], A mathematical frame to deal with the Face-to-Face Word of Mouth Communication (WOMC) and the Network WOMC was obtained, respectively. The difference between two types of WOMC is how the information can be conveyed. In the former type, information goes through the real human contact, which can be understood as on-site-communication. To the contrary, in the later, information can leap to remote places passing through the acquaintance network provided by telecommunication such as cellular phone and e-mail. For practical calculation, a program on the platform of the Multi-Agent type simulation was developed. Using this, a numerical experiment was done to reveal fundamental characteristics of both the Face-to-Face and Network WOMC.. |
| 745. | Aya Hagishima, Jun Tanimoto, Field measurements for estimating the convective heat transfer coefficient at building surfaces, Building and Environment, 10.1016/S0360-1323(03)00033-7, 38, 7, 873-881, 2003.01, [URL], To establish a comprehensive and qualitative prediction basis for the convective heat transfer coefficient (CHTC) for various urban canopy surfaces mainly consisting of building envelopes, a series of outdoor experiments were performed. Multi-point measurements of surface heat balance lead to a distribution of the CHTC on an actual building envelope. Several turbulent statistical values acquired at two different sites enabled the development of an experimental equation depicted by non-dimensional numbers that express a relationship between CHTC and wind velocity containing a turbulent factor. An important thing is the fact that the two measuring sites, one a rooftop slab and the other the vertical wall of a test dwelling, have different scales and different surface directions facing the wind.. |
| 746. | Haruyuki Fujii, Jun Tanimoto, Exploration in Complex Systems for Environmentally Symbiotic and Sustainable Society, Journal of Asian Architecture and Building Engineering, 10.3130/jaabe.2.107, 2, 1, 107-113, 2003, [URL], The authors assume that it is necessary to find a set of solutions to the crucial issues concerning the relation between the global environment and the sustainable human society. Based on the assumption, the authors have been developing man-environment-society system models to simulate the characteristic phenomena related to the issue. This paper describes one of the models focusing on a social dilemma that actions rationally performed to make individual’s indoor thermal environment better bring about worse environment against the rational decision. Some results of the case study simulations with the purpose to find some crews to deal with the issues are also shown.. |
| 747. | Ping He, Tadahisa Katayama, Tetsuo Hayashi, Jun Ichiro Tsutsumi, Jun Tanimoto, Izuru Hosooka, Numerical simulation of air flow in an urban area with regularly aligned blocks, Journal of Industrial Aerodynamics, 67-68, 281-291, 1997.04, Numerical simulation of air flow distribution in a built-up area is an effective way to analyze and predict the urban thermal environment. A cyclic boundary conditions method for the numerical simulation of air flow around a block is used to model the unlimited spread of a built-up area. An equation for the calculation of the pressure difference between the windward and the leeward boundaries is proposed. Another simulation model which has 10 blocks aligned with the wind direction is used for comparison. The inflow boundary conditions are given by a wind tunnel test. The cyclic boundary conditions produced stable calculation results. The simulation results of the cyclic boundary conditions model are similar to those of the 10-block model in the cavity space. There is, however, a little difference between the results of these two models, and between them and the wind tunnel test in the higher area above the cavity and at the crossing point of the streets.. |
| 748. | Jun Tanimoto, Ken Ichi Kimura, Simulation study on an air flow window system with an integrated roll screen, Energy and Buildings, 26, 3, 317-325, 1997, A numerical calculation procedure for an air flow window (AFW) system integrated with a roll screen is presented. Both heat and airflows within the window elements such as the outside pane of glass, the outside air space, a venetian blind, the inside air space and a roll screen, are taken into account by considering the thermal and air flow networks. Agreements between measured and calculated results of temperatures and pressure differences through a series of experiments carried out in an environmental test chamber were observed. To identify the quantitative characteristics of an AFW integrated with a roll screen, a series of numerical simulations were performed with the results from using a large resistance to the air flow from the upper half area of the roll screen. These show that this was effective in terms of thermal characteristics and suggest that a tightly-meshed roll screen, situtated in the upper half area, is suitable for both environmental and design reasons. If the heated air flow generated from the inside air space to the room were dispersed properly, the thermal efficiency of the AFW integrated with a roll screen would be equal to a conventional AFW system. The effect of a cold draft passing though the roll screen is also discussed.. |
| 749. | (10) Jun Tanimoto, A study of indirect reciprocity involving a reputation system or a simple tag system in a one-shot, multi-player game, BioSystems, in Press, [URL]. |
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総合理工学研究院
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