深紫外レーザーアブレーションによるLow-kポーラスSiO2薄膜作製に関する研究
キーワード：レーザーアブレーション，ナノ微粒子生成，low-k薄膜，ポーラスSiO2，深紫外レーザー
2021.04.

レーザーアブレーションプラズマのレーザー計測法による粒子計測と反応制御に関する研究
キーワード：レーザーアブレーション，レーザー計測法，粒子ダイナミクス，ナノ微粒子生成
2020.04.

農水畜産物の鮮度保持システムのための最適電界環境の構築
キーワード：電場システム，生鮮食料品，鮮度保持，コールドチェーン，電場解析シミュレーション
2017.04.

光学的手法による被溶射基板の表面粗さ計測法の開発
キーワード：溶射プロセス，表面粗さ，レーザー，三角距測
2017.04.

パルスレーザーラマン分光法を用いたワイドバンドギャップ半導体の非接触温度，及び歪み測定法の開発
キーワード：パルスレーザー，LED，LD, ワイドバンドギャップ半導体，温度，歪み，リモート計測
2016.04.

溶射プロセスにおける粒子パラメータ計測法の開発
キーワード：溶射プロセス，飛翔粒子，温度，速度，リモート計測
2014.04.

パルスレーザーを用いたLEDのジャンクション温度計測法の開発
キーワード：パルスレーザー，LED，ジャンクション温度，リモート計測
2011.04.

大気圧パルスマイクロ放電のレーザー計測法による特性解明
キーワード：大気圧マイクロ放電，バリア放電，レーザー計測法，電子エネルギー分布関数
2006.04.

大面積VHFプラズマの均一化に関する研究
キーワード：大面積VHFプラズマ，均一化，薄膜太陽電池，定在波
2010.04～2015.03.

大気圧非熱平衡放電を用いたディーゼル排気ガスの浄化技術開発に関する研究
キーワード：大気圧非熱平衡放電，ゼオライト，ハニカム，触媒，NOx，DPM，同時除去，ディーゼル排気ガス
2001.05～2010.03.

大気圧バリア放電と濃縮技術のハイブリッド化による環境有害物質の高効率除去に関する研究
キーワード：大気圧バリア放電，ゼオライト，ハニカム，触媒，VOC，NOx，高効率除去，ディーゼル排気ガス
1995.04～2016.03.

蛍光ランプ放電内のレーザー誘起蛍光法による粒子密度計測と最適制御に関する研究
キーワード：レーザー誘起蛍光法，蛍光ランプ，粒子ダイナミクス，低仕事関数
2004.04～2016.03.

レーザートムソン散乱法による放電プラズマ中の負イオン密度計測
キーワード：レーザートムソン散乱法，負イオン，電子エネルギー分布関数
2001.05～2009.03.

既存電力供給システムへの再生可能エネルギーの大量導入に関する研究
2018.04, 代表者：山形幸彦, 九州大学
既存の電力供給システムへ太陽光発電，風力発電に代表される再生可能エネルギーを大量導入する際にメリット，デメリット等に関してシミュレーションを駆使して明らかにする研究.

農産物のグローバルコールドチェーン網を実現させる高鮮度保持システムの研究開発
2017.11～2019.03, 代表者：石井 誠, 日通商事(株), (株)産学連携機構九州（日本）
農産物の生産地から消費地までシームレスな高鮮度保持を目指し，国産農産物の国際競争力を強化させる電場システムによるグローバルコールドチェーン網の実現させる高鮮度保持システムを開発する．.

光学的手法による被溶射基板の表面粗さ計測法の開発
2017.04, 代表者：山形幸彦, 九州大学総合理工学研究院, 九州大学（日本）
レーザーを用いた光学的手法により，溶射プロセスの基板の表面粗さを簡易的に計測するコンパクトな測定システムを開発する。.

パルスレーザーラマン分光法を用いたワイドバンドギャップ半導体の非接触温度，及び歪み測定法の開発
2016.04, 代表者：山形幸彦, 九州大学総合理工学研究院, 九州大学（日本）
LED，LDやパワーデバイス応用に向けて研究が行われているワイドバンドギャップ半導体の温度や歪みをリモート計測する新たな手法を開発する．.

溶射プロセスにおける粒子パラメータ計測法の開発
2014.04, 代表者：山形幸彦, 九州大学総合理工学研究院, 九州大学（日本）
溶射プロセスにおける，温度、速度、数密度などの粒子パラメータを計測する標準的な測定システムを開発する。.

パルスレーザーラマン分光法を用いたLED発光部の非接触温度測定法の開発
2011.04, 代表者：山形幸彦, 九州大学総合理工学研究院, 九州大学（日本）
LEDの更なる高効率化・長寿命化，開発期間短縮のために，点灯中LEDのジャンクション部の温度を高精度，短時間でリモート計測する新たな手法を開発する．.

レーザーピーニング法による窒化アルミニウムの高機能化に関する研究
2011.04～2012.03, 代表者：山形幸彦, 九州大学総合理工学研究院, 九州大学（日本）
高い絶縁性と熱伝導性を持つためパワーデバイス用の基板として重要視されている窒化アルミニウム（AlN）に，パルスレーザーを用いたピーニング処理を施すことにより，その高機能化を目指している．.

ヘリコン源を用いた先進的無電極プラズマロケットエンジンの研究開発
2010.04, 代表者：篠原俊二郎, 東京農工大学, 東京農工大学
超長寿命のプラズマロケットエンジンを目指して，無電極ヘリコン波プラズマ源を採用し，無電極加速法の実験を用いてヘリコン源の最適化と性能評価を行う．それと同時に理論・シミュレーション等との比較検討を通じて最適手法の選択を行う．推進性能目標は，噴出速度40km/sで推進効率50%以上とし，将来の実用化に備えて異なるエンジン寸法に対応できるようなエンジンバリエーション設計まで実施する．.

蛍光ランプの高効率化・長寿命化の実験的・理論的検討
2009.10～2013.03, 代表者：山形幸彦, 九州大学総合理工学研究院, 九州大学（日本）
蛍光ランプの更なる高効率化・長寿命化，開発期間短縮のために，蛍光ランプのエミッター放出と電極温度分布の関連を詳細に解明し，その最適動作条件の探索を行い，電極の最適設計と放電の最適制御を実験，シミュレーションの両面から行う．これらにより，長寿命・高効率の蛍光ランプの設計指針提示を目的とする．.

平成１３年度　経済産業省・即効型地域新生コンソーシアム
2001.04～2002.03, 代表者：村岡克紀, 九州大学, 九州大学
ゼオライトによる濃縮過程と大気圧非熱平衡放電プラズマを用いた有害ガス吸着分解素子の開発.

独立行政法人 新エネルギー・産業技術総合開発機構（NEDO）「化学物質総合評価管理プログラム−有害化学物質リスク削減基盤技術研究開発」
2004.04～2006.03, 代表者：岡野浩志, （株）西部技研, （株）西部技研
プラズマを用いた有機ガス吸着分解素子の開発.

主要著書

主要原著論文

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, [URL], 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.	川口保幸, 宮﨑文宏, 山﨑正文, 山形幸彦, 小林 希, 村岡克紀, Al-5Mg溶射皮膜に及ぼす溶射粒子の温度と速度の影響, 溶射, 10.11330/jtss.54.1, 54, 1, 1-7, 2017.01, Spatial distributions of temperature and velocity of spray droplets are measured using an optical monitoring system, so as to observe their influences on Al-5Mg coating qualities for three different thermal spray facilities. These are wire arc spray, wire plasma spray, and gas flame spray facilities. Coating qualities investigated are compositions, adhesive strength, porosity, and hardness of coating layers. It has been shown that compositions are strongly influenced by temperature of spray droplets and surrounding shielding gases, and adhesive strengths are dependent on temperature and velocity, while porosities are mostly influenced by velocity. In addition, hardness is shown to depend on the Mg concentrations in the coating layers, which in turn are influenced by temperature of spray droplets and surrounding shielding gases as described above. These observations are discussed from adhesion and formation processes of thermal spray droplets into coating layers..
4.	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, 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.
5.	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.
6.	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.
7.	浦江英孝, 山形幸彦, 村岡克紀, 山田健一郎, 山内恒, 岡野浩志, 希薄揮発性有機物のゼオライト吸着による濃縮とバリア放電の組合せによる除去, 電気学会論文誌, 第A-122巻, 第11号, pp. 965-976, 2002.11.
8.	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, [URL], 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..

主要総説, 論評, 解説, 書評, 報告書等

1.	真鍋由雄, 森　利雄, 岡崎祐輔, 甲斐　誠, 山形幸彦, ランプ寿命推定法を用いた長寿命蛍光ランプの開発, パナソニック技報, Vol. 52, No. 2, pp. 44-49, 2010.09.
2.	山形幸彦, 内野喜一郎, 放電プラズマの分光計測(4)レーザトムソン散乱法, 放電学会誌, Vol. 49, No. 3, pp. 2-8, 2006.10.
3.	山形幸彦, レーザー誘起蛍光法による蛍光ランプの診断, 照明学会誌, Vol. 91, No. 7, pp. 368-371, 2007.09.

主要学会発表等

1.	K. Miyoshi, Y. Yamagata, T. Shimada, Y. Manabe, M. Horiuchi , Remote measurement of junction temperature of blue-LED module using pulsed-laser Raman scattering, MRM2021 Materials Research Meeting, 2021.12.
2.	堀内　誠, 山形幸彦, 富田健太郎, 真鍋由雄, Pulsed-laser Raman scattering for simultaneous estimation of junction temperatures in a LED module, BIT’s 6th Annual World Congress of Advanced Materials-2017, 2017.06, For LED and other semiconductor power devices in which integration and high current operation are required, the efficiency, the lifetime, and the operational stability degrade remarkably resulting from the temperature rise of the junction of these devices. Therefore, in order to fabricate a high quality device, junction temperature measurement of the device in operation, and the heat radiation design of the whole device based on the experimental results are primary important. In this study a novel method by using a pulsed-laser Raman scattering technique was employed to estimate junction temperatures of a phosphor-less blue-LED module. Observation of GaN-E2H Raman spectra was done successfully and temperature dependent Raman spectra of GaN were detected. This technique was applied to simultaneous estimation of the junction temperatures of the several chips in the phosphor-less blue LED module in operation. It is concluded that this technique would be a useful method for remoteness and simultaneous multipoint measurement, which lead to 2D mapping of the junction temperature of a white-LED in which several chips are integrated..
3.	山形 幸彦, Pulsed-laser Raman scattering for measurement of junction temperature of white-LED, the 5th International Conference and Exhibition on Lasers, Optics and Photonics, 2016.11, Recently, the characteristic of a light emitting diode (LED) has been improved dramatically, and the application to illumination is recognized as one of the most important issue to the manufacturers. It is well known that the efficiency, the output power, the life-time and the reliability of LED degrade with a temperature rise of the junction of LED. In order to fabricate a high quality LED module for illumination, it is necessary to keep the junction temperature low by improving the characteristic of LED chip itself, or by effective heat removal through a heat radiation design of the module. Therefore, it is strongly required to establish a standard method to measure the junction temperatures in LED module. Although several techniques, such as micro-Raman spectroscopy, infrared imaging, temperature coefficient of diode-forward voltage and so on, are applied to estimate the junction temperature, there is no method that can simultaneously measure the junction temperature of the several chips located in a LED module, especially in a phosphor-deposited white-LED. Under these situations, we have been developing a pulsed-laser Raman scattering method for estimation of the junction temperature of LED, where the Raman shift of E2H mode of GaN layer is observed. This method has potentials of remoteness and simultaneous multipoint measurement, which lead to 2D mapping of the temperature of the LED module. This technique has been applied successfully to measure the junction temperature of phosphor-less blue-LED, and is considered to be one of the prospective candidates of temperature estimation method of white-LED. In this presentation, simultaneous observation of Raman spectra from several LED chips in a phosphor-less blue-LED module by a pulsed-laser Raman scattering method is demonstrated. Also, the influence of a phosphor deposited on the surface of blue-LED on Raman spectra is discussed..
4.	山形 幸彦, 可視光源としての放電灯－熱陰極放電灯－, 平成24年度（第45回）照明学会全国大会, 2012.09.

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学術論文等の審査

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外国人研究者等の受入れ状況