| Yukihiko Yamagata | Last modified date：2024.04.16 |
Associate Professor /
Electrical Process Engineering
Department of Advanced Energy Science and Engineering
Faculty of Engineering Sciences
Department of Advanced Energy Science and Engineering
Faculty of Engineering Sciences
Graduate School
Undergraduate School
E-Mail *Since the e-mail address is not displayed in Internet Explorer, please use another web browser:Google Chrome, safari.
Homepage
https://kyushu-u.elsevierpure.com/en/persons/yukihiko-yamagata
Reseacher Profiling Tool Kyushu University Pure
http://igses.kyushu-u.ac.jp/yamagata-tsutsui/jp/en/index.html
Ionized Gas Dynamics Laboratory .
http://www.asem.kyushu-u.ac.jp/ep/ep01/jp/index.html
Ionized Gas Dynamics Laboratory .
Phone
092-583-7605
Fax
092-583-7605
Academic Degree
Doctor of Engineering
Country of degree conferring institution (Overseas)
No
Field of Specialization
Plasma Science and Technology
Total Priod of education and research career in the foreign country
01years01months
Research
Research Interests
- Synthesis of Low-k porous SiO2 thin film using a deep UV pulsed-laser ablation
keyword : laser ablation, nano particle deposition, low-k thin film, porous SiO2, Deep UV laser
2021.04Spatial and temporal measurements of Ba atoms in a fluorescent lamp using laser-indeced fluorescence method. - Control of laser ablation plume by diagnostics of particle characteristics using laser-aided measurement method
keyword : laser ablation, laser-aided measurement method, diagnostics of particle characteristics, nano particle deposition
2020.04Spatial and temporal measurements of Ba atoms in a fluorescent lamp using laser-indeced fluorescence method. - Optimization of electric field distribution in a new refrigerator system for keeping freshness of perishable foods
keyword : electric field, freshness, cold chain, perishable food,
2017.04Spatial and temporal measurements of Ba atoms in a fluorescent lamp using laser-indeced fluorescence method. - Development of measurement technique for surface roughness of substrate material in thermal spraying process
keyword : thermal spraying, surface roughness, laser measurement, simple and compact system
2017.04Spatial and temporal measurements of Ba atoms in a fluorescent lamp using laser-indeced fluorescence method. - Development of measurement technique for temperature and strain of semiconductors having a wide band gap using pulsed-laser scattering system
keyword : pulsed laser, LED, LD, wide band gap, semiconductor, junction, strain, remote measurement
2016.04Spatial and temporal measurements of Ba atoms in a fluorescent lamp using laser-indeced fluorescence method. - Development of measurement system for particle parameters in thermal spraying process
keyword : thermal spraying, particle, temperature, velocity, remote measurement
2014.04Spatial and temporal measurements of Ba atoms in a fluorescent lamp using laser-indeced fluorescence method. - Development of temperature measurement method for the junction of working LED using pulsed-laser system
keyword : pulse laser, junction temperature, LED, remote measurement
2011.04Spatial and temporal measurements of Ba atoms in a fluorescent lamp using laser-indeced fluorescence method. - Investigation of properties of atmospheric micro discharge using laser diagnostics
keyword : atmospheric micro discharge, dielectric barrier discharge, electron temperature, electron density, laser diagnostics
2006.04Investigation of properties of atmospheric micro discharge using laser diagnostics. - Development of generation method for uniform and large-area VHF plasmas
keyword : large-area VHF plasma, uniform, thin film solar cell
2010.04～2015.03. - Simultaneous decomposition of NOx and particulate matter in deisel exhaust gas using non-thermal atmospheric discharge
keyword : nitric oxides, diesel particulate matter, diesel exhaust gas, simultaneous decomposition, zeolite, non-thermal atmospheric discharge
2001.05～2010.03Simultaneous decomposition of NOx and particulate matter in deisel exhaust gas using non-thermal atmospheric discharge. - Development of effective decomposition technique of environmentally hazardrous materials with low concentration using atmospheric dielectric barrier discharge combined with adsorption/localization method
keyword : hazardrous materials, VOC, NOx, low concentration, Zeolite, adsorption, honeycomb, atmospheric pressure, dielectric barrier discharge
1995.04～2016.03Aftertreatment of environmentally hazardrous materials using atmospheric dielectric barrier discharge combined with adsorption/localization technique. - Spatial and temporal measurements of Ba atoms in a fluorescent lamp using laser-induced fluorescence method
keyword : fluorescent lamp, Ba, laser-induced fluorescence, electrode temperature, low pressure glow discharge plasma
2004.04～2016.03Spatial and temporal measurements of Ba atoms in a fluorescent lamp using laser-indeced fluorescence method. - Measurement of negative ion density in plasmas using laser Thomson scattering
keyword : negative ion density, electron density, low pressure discharge plasma, laser Thomson scattering
2001.05～2009.03Development of measurement method of density of negative ion in plasmas using laser Thomson scattering.
Papers
| 1. | Y. Kawaguchi, N. Kobayashi, Yukihiko Yamagata, F. Miyazaki, M. Yamasaki, J. Tanaka, K. Muraoka, Optical monitoring systems for thermal spray processes Droplets behavior and substrate pre-treatments, Journal of Instrumentation, 10.1088/1748-0221/12/11/C11031, 12, 11, 2017.11, Thermal spray is a technique to form molten droplets using either plasma- or combustion-heating, which impinge upon substrates to form coating layers for various purposes, such as anti-corrosion and anti-wear layers. Although it is an established technique having a history of more than a century, operations of spray guns together with preparing suitable substrate surfaces for obtaining good coating layers still rely on experienced technicians. Because of the necessity of meeting more and more stringent requirements for coating quality and cost from customers, there has been a strong need to try to monitor spray processes, so as to obtain the best possible spray coating layers. The basic requirements for such monitoring systems are ∗reasonably cheap, ∗easy operation for laypersons, ∗easy access to targets to be investigated, and ∗an in-situ capability. The purpose of the present work is to provide suitable optical monitoring systems for (1) droplets behavior and (2) substrate pre-treatments. For the former (1), the first result was already presented at the 17th laser-aided plasma diagnostics meeting (LAPD17) in 2015 in Sapporo, and the results of its subsequent applications into real spray environments are shown in this article in order to validate the previous proposal. Topic (2) is new in the research program, and the proof-of-principle experiment for the proposed method yielded a favorable result. Based on this positive result, an overall strategy is being planned to fulfill the final objective of the optical monitoring of substrate pre-treatments. Details of these two programs (1) and (2) together with the present status are described.. |
| 2. | M. Horiuchi, Y. Yamagata, S. Tsutsumi, K. Tomita, Y. Manabe, The Development of a System for Measuring the Junction Temperatures of Multiple LEDs on a Package Simultaneously by Using Pulsed-laser Raman Scattering, Journal of Science and Technology in Lighting, 10.2150/jstl.IEIJ160000584, 41, 101-107, Online ISSN : 2432-3233 Print ISSN : 2432-3225, 2017.11, This paper details a novel method consisting of employing a pulsed-laser Raman scattering technique to estimate junction temperatures of several LED chips arranged in a straight line on a phosphor-less blue-LED package and a phosphor-resin coated blue-LED package. By using a sheet-shaped irradiation pattern, each of the GaN-E2H Raman spectra from several chips mounted straight on a phosphor-less blue LED package was observed at the same time and the junction temperature of each chip was estimated successfully by means of each Raman shift during operation despite the existence of strong LED emission. In addition, the GaN-E2H Raman signal from the phosphor-resin coated blue-LED was observed for the first time by using 633 nm laser to reduce the negative influence from the phosphor and light diffusing substances in the resin. It is concluded that this technique would be a useful method for a remote and standard system for 2D mapping of the junction temperatures of blue-LED packages.. |
| 3. | Makoto Horiuchi, 山形 幸彦, Shin-ichi Tsutsumi, 富田 健太郎, Yoshio Manabe, Development of junction temperature estimation system for light-emitting LED using pulsed-laser Raman scattering, Journal of Solid State Lighting, 10.1186/s40539-015-0026-9, Vol. 2, 7, 1-7, 2015.07, [URL], A new method by using a pulsed-laser Raman scattering technique was employed to estimate junction temperature of a fluorescence-resin-less blue-LED package. Temperature dependent Raman shift of E2 H mode of GaN layer in the blue-LED were obtained and were in good agreement with the experimental data published by the other researchers. This technique was applied to estimation of a junction temperature of the light-emitting blue-LED. The junction temperature was successfully estimated even under the strong stray light and LED light emission. It is considered that the proposed technique would be a remote and standard system for measuring the junction temperature of light-emitting white-LEDs. |
| 4. | Y. Yamagata, K. Niho, T. Jono, K. Muraoka, Simultaneous decomposition of diesel particulate material and NOx using dielectric barrier discharge, Journal of Advanced Oxidation Technologies, Vol. 9, No. 2, pp. 134-138, 2006.06. |
| 5. | H. Naitou, Y. Sakurai, Y. Tauchi, O. Fukumasa, M. Yagi, Y. Yamagata, K. Uchino, K. Muraoka, Simulation of photo-detached electrons in negative ion plasmas, Plasma Physics and Controlled Fusion, 10.1088/0741-3335/46/8/004, 46, 8, 1217-1230, Vol. 46, pp. 1217-1230, 2004.07. |
| 6. | T. Ikegami, T. Maezono, F. Nakanishi, Yukihiko Yamagata, K. Ebihara, Estimation of equivalent circuit parameters of PV module and its application to optimal operation of PV system, Solar Energy Materials and Solar Cells, 10.1016/S0927-0248(00)00307-X, 67, 1-4, 389-395, 2001.03, A method to estimate the equivalent circuit parameters of a PV (photovoltaic) module is presented. The parameters are calculated using a least-squares fitting of the equivalent model current-voltage characteristic with the measured one. For applications of the equivalent circuit model parameters, a quantitative diagnostic method of the PV modules by evaluating the parameters is introduced and examined by simulation. A new maximum peak power tracking (MPPT) method using the model parameters, a solar insolation, and a cell temperature is also shown. Its performance is compared with other MPPT control algorithms by simulations. The performance of the proposed method was better than other MPPT methods.. |
Presentations
Unauthorized reprint of the contents of this database is prohibited.