| Kimura Hajime | Last modified date：2023.11.22 |
Professor /
Naval Architecture and Marine Systems Engineering Human Resource Development Course /
Faculty of Engineering
Presentations
| 1. | Hajime Kimura, A position estimation system for indoor workshops making use of maximum likelihood estimation in Weibull distribution model of wireless LAN, International Conference on Computer Applications in Shipbuilding (ICCAS), 2022.09, In shipyards, it is required to obtain the position of people and goods in order to manage people, objects, improve work placement, and secure workers' safety. Although the mainstream of location estimation is GPS, it cannot be used for position detection at indoor workshops. Meanwhile, the infrastructure of the wireless LAN has been in place in recent factories, and if these can be used for position detection, the installation cost of facilities for position detection can be reduced. In this research, we investigate a location estimation method based on a certain statistical algorithm using radio field intensity distribution maps of unspecified number of wireless LANs without specifying the access point installation position, and verify the position estimation accuracy in several indoor workshops.. |
| 2. | Automatic Pipeline Design System Using Reinforcement Learning. |
| 3. | Akihito Matsubasa, Tomoyuki Asanuma and Hajime Kimura: A Hull Wall Walking Robot Using Magnetic Adsorption Unit and Air Actuator, Conference Proceedings of the Japan Society of Naval Architectures and Ocean Engineers, Vol.34, pp.431--434 (May 2022) in Japanese. . |
| 4. | Hajime Kimura, Kandai Fukumoto: A Position Estimation System Making use of Distribution of Wi-Fi Radio Intensity, 49th SICE Symposium on Intelligent Systems, March 14-15, 2022, Online (in Japanese). . |
| 5. | Akihito Matsubasa and Hajime Kimura: Magnetic Adsorbing Unit for Ship-hull Wall Walking Robot, Conference Proceedings of the Japan Society of Naval Architectures and Ocean Engineers, Vol.33, pp.335--336 (Nov 2021) in Japanese. . |
| 6. | RCPSP-based Process Scheduling of a Shipbuilding Stockyard. |
| 7. | Koya Murata, Hajime Kimura, A Development of Web Application for Viewing SPEEDS Format Using X3D, International Conference on Computer Applications in Shipbuilding, 2019.09, Currently, in Japan, as an information sharing platform to effectively use ship 3D data in the maritime industry, a format called SPEEDS (Smart Platform of Enhanced Engineering Data for Shipping and Shipbuilding) is being developed. This is a format that aims to facilitate the sharing of ship 3D data between shipyards and other organizations. However, SPEEDS is still a developing, and there is no free software that can handle. Therefore, we aimed for free system development for SPEEDS, and developed an open source system that can browse SPEEDS data. This system uses X3D and operates on a web browser. Therefore, even small devices can use data, so various usage scenes can be expected. This paper describes the functions and specifications of this system and the expected use cases. We will also examine the problems and possibilities of SPEEDS discovered through the development of this system.. |
| 8. | Hajime Kimura, Nariki Iwauchi, Yuuichi Yoshida, A Position Estimation System Making Use Of Signal Strength Of Wireless LAN in a Shipyard, International Conference on Computer Applications in Shipbuilding, 2019.09, 造船所において，人・モノの管理や作業・配置改善等のために人・モノの位置の取得が求められている． 位置検出の主流はGPSだが，屋根のある建屋内の位置検出には向いておらず，屋内外に対応した位置検出／推定手法が必要である． 屋内に対応した位置検出法として無線LANを利用した方法がある． これは一般に無線LANのインフラが整ってきており，これらを利用し導入コストを削減できるからである． しかし，市販の位置推定サービスを利用すると導入や維持・管理に大きなコストがかかる．サービス形態にもよるが400万円近い導入・管理費用がかかるものもある．そこで本研究では，オフィスや工場にすでに導入されている無線LANのインフラをそのまま利用し，複数の不特定の無線LANルータの電波強度を用いて造船工場内で作業員などの位置を推定するシステム構築の可能性について検討する． . |
| 9. | RCPSP-based Process Scheduling of a Shipbuilding Stockyard. |
| 10. | Hajime Kimura, Automatic Piping Arrangement Design Considering Piping Supports and Curved Surfaces of Building Blocks, International Conference on Computer Applications in Shipbuilding, 2017.09, In piping design, consideration must be given to the position and direction in which pipes are passed, in order to properly support pipes from pipe racks and structural members with support. In this paper, a new piping path planning system is proposed in order to automate piping design corresponding to pipe supports and curved hulls. In the proposed system, candidates for positions and directions to which pipes should be passed are given in advance as 'candidate points' from the circumstances of pipe racks and support. Then, the system selects the appropriate candidate points automatically to generate piping paths keeping constraint of many factors, e.g., gravitational flow, or geometrical limitation of the pipe-bending machine, etc. Therefore, it is quite practical. The performance of the proposed system is demonstrated through several simulations. . |
| 11. | A position estimation system making use of signal strength of wireless LAN in a shipyard. |
| 12. | A Development of Ship-Hull and Lines Generator System for Technical Drawing Exercises. |
| 13. | Automatic pipe-routing design making use of CFD. |
| 14. | Automatic Piping Arrangement Design Making Use of Overlapped Shortest Piping Paths. |
| 15. | Automatic Piping Arrangement Design Considering Piping Supports and Curved Surfaces of Building Blocks. |
| 16. | Automatic Piping Arrangement Design using Filling and Thinning Operations in Voxel Space . |
| 17. | High precision measurement by superposition processing of high-speed 3D scan data. |
| 18. | A shape measurement system by a fast depth measurement device. |
| 19. | A study of a non-contact 3D viewer system making use of Kinect v2 sensor. |
| 20. | Development of an Instrument System for Field Alignment Piping using Kinect V2 Sensor. |
| 21. | An automatic design system for piping. |
| 22. | Development of an instrument system for field alignment piping using Kinect Sensor. |
| 23. | A study of Frame-grounding type seafloor mining excavator. |
| 24. | Development of a design support system for field alignment piping. |
| 25. | A study of excavation for mining from the deep sea floor. |
| 26. | Automatic Pipe-routing system using Touch and Cross method. |
| 27. | A Study of Advanced Use of LAN for Shipboard Equipment Systems and Ship's 3D Information. |
| 28. | A Material Distribution Scheduling for Rigging Ship-hull Blocks with Pipes. |
| 29. | Automatic Pipe Routing to Avoid Air Pockets. |
| 30. | A study of automatic 3D-CAD data generation using data from depth sensors. |
| 31. | Yuto Ando, Hajime Kimura, Automatic Pipe Routing to Avoid Air Pockets, International Conference on Computer Applications in Shipbuilding, 2013.09, [URL], Pipe arrangement is one of the most time-consuming works in ship production because the process requires designers to decide the optimum pipe routes. Previous works focused on finding preferable routes by applying optimization methods, but these methods have not considered the effect of gravity in obtained pipe routes. This paper presents an automatic pipe routing method that avoids air pockets. We call vertical U-shaped pipes “air pockets”. In this paper, the pipe routing problem is considered as a routing problem in a directed and weighted graph. Dijkstra’s method is used in the routing process for generating candidates of optimum routes. In order to avoid making air pockets in the obtained routes, we try to use a new cost function. The performance of this method is shown in several demonstrations.. |
| 32. | Kazumasa Noda, Hajime Kimura, A material distribution scheduling for rigging ship-hull blocks with pipes, International Conference on Computer Applications in Shipbuilding, 2013.09, [URL], In the precedence rigging of shipbuilding, most of the man-hour of rigging consists of piping work. Therefore it is important how the rigging of pipes is performed efficiently. Currently, all pipes which rigged in the engine room are distributed on the same working space in the target shipyard. There are two problems; One is the distributed pipes occupy a wide space to stock until installation, the other is it takes long time to find target pipes from distributed pipes. We propose a new system which divides the pipes into several groups considering the assembling order that skilled workers adopt. The number of the groups depends on the period of the piping works. Our system enables to reduce the burden of workers, reduce temporary space which placed pipes, and improve efficiency of the piping work. We show a demonstration of the proposed system through simulation using real ships’ data.. |
| 33. | Kimura Hajime, An Automatic Pipe Arrangement Algorithm Considering Elbows and Bends, International Conference on Computer Applications in Shipbuilding, 2012.06, [URL], Nowadays, piping arrangement has been enabled to be more efficient by development and spread of CAD (Computer-Aided Design). However, it is difficult to design piping layout automatically because there are many regulations and functional design rules which must be satisfied. We propose an automatic routing method for simple pipes considering elbows and bends. In practical design of piping layout, there are many bends connecting straight eccentric pipes which have gaps within the pipes' diameter. However, no precedence automatic piping algorithm has been taken into account pipelines with such bends. The proposed method finds piping routes making use of not only elbows but the bends minimizing costs of the path connecting start point to goal point, while avoiding obstacles such as structures, equipments and the other circuits. In our approach, we consider the piping route design problem to a routing problem in a directed and weighted graph. Note that the nodes in the proposed graph have state variables not only locations but directions of the pipes. Consequently, this graph can easily express the bends as simple edges, and then the routing algorithm can easily handle the bends. In addition, the presented method has specifications that the sizes of each cell, which is generated by decomposing of a free space, are not restricted within the diameter of the pipe. The routing algorithm uses Dijkstra's method to provide candidate paths. For practical use, the system adopts XML-file-based interface. This paper presents a new idea to express specific arrangement rules or policies using XML. The efficiency of the proposed method is demonstrated through several experiments.. |
| 34. | Optimization of scheduling in a ship-building block-stockyard with stack structure, [URL]. |
| 35. | Automatic Recognition of Building Progress of Ship-hull Blocks Using USB Camera, [URL]. |
| 36. | Optimization of arrangement of scheduled blocks in a ship building stockyard, [URL]. |
| 37. | , [URL]. |
| 38. | , [URL]. |
| 39. | An Automatic Piping Algorithm including Elbows and Bends, [URL]. |
| 40. | Valve Operability Optimization in An Automatic Designing System for Piping and Instruments Arrangement including Branches of Pipes, [URL]. |
| 41. | A piping algorithm using Dijkstra method. |
| 42. | A study for a practical automatic piping system. |
| 43. | A Genetic Algorithm for Pipe Arrangement including Equipments and Branches. |
| 44. | An Automatic Designing System for Piping and Instruments Arrangement including Branches of Pipes. |
| 45. | Hull Recognition System using Augumented Reality. |
| 46. | Automatic Pipe Arrangement Design using GA Emphasizing Character of Piping Route. |
| 47. | A Study of Performance Evaluation on Thruster Allocation Methods for Azimuth Thrusters. |
| 48. | Planning for Delivering of Steel Plates in a Stockyard using Hierarchical Reinforcement Learning. |
| 49. | Automatic Pipe Arrangement Design Using GA Emphasized Character of Piping Route. |
| 50. | Natural Gradient Actor-Critic Algorithms using Random Rectangular Coarse Coding. |
| 51. | On a Unified Motion Planning for a Multifunctional Underwater Robot. |
| 52. | On dynamically optimal thrust allocation under the azimuth thrusters' angle constraints. |
| 53. | A Multi-joint Underwater Robot that can Move Efficiently on Underwarter Structures. |
| 54. | Discrete Event Simulation of a Steel Stockyard. |
| 55. | Automatic Pipe Arrangement Design considering Operationality of Valves using a Multi-objective Genetic Algorithm. |
| 56. | On Optimal Motion Planning for Multi D.O.F. Underwarter Manipulator Considering Fluid Drag. |
| 57. | Hajime Kimura, Youichi Nakao, and Hiroyuki Kajiwara: An inprovement of sorting efficiency in a shipbuilding stockyard,. |
| 58. | A pipe arrangement using multi-objective genetic algorithms. |
| 59. | Reinforcement Learning with an action-selection selection scheme using Hash and Gibbs-sampling. |
| 60. | An improvement of sorting efficiency in a ship-building stockyard. |
| 61. | Automatic design for pipe arrangement using multi-objective gentic algorithms. |
| 62. | Reinforcement Learning in high-dimensional state-action space using random tiling. |
| 63. | Reinforcement Learning in high-dimensional state-action space: Development of a random rectangular coarse coding. |
| 64. | On Mass Generation of Sea Lettuce in Hakata Bay and the Collection Technique. |
| 65. | A Study of an Underwater Sensor for Working Robots Using an Electrical Geophysical Exploration Method . |
| 66. | On Optimal Path Planning of Autonomous Underwater Vehicle in a Current Field. |
| 67. | Natural Gradient Actor-Critic using Eligibility Traces. |
| 68. | Automatic Pipe Arrangement Design considering Operationality of Valves . |
| 69. | Reinforcement Learning in Multi-Dimensional State-Action Space Using Random Rectangular Coarse Coding and Gibbs Sampling, [URL]. |
| 70. | Reinforcement Learning in Multi-Dimensional State-Action Space Using Random Rectangular Coarse Coding and Gibbs Sampling, [URL]. |
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