研究者詳細

顔写真

サトウ シンタロウ
佐藤 慎太郎
Shintaro Sato
所属
大学院工学研究科 航空宇宙工学専攻 宇宙システム講座(推進工学分野)
職名
助教
学位
  • 博士(工学)(東北大学)

  • 修士(工学)(東北大学)

経歴 2

  • 2019年10月 ~ 継続中
    東北大学大学院工学研究科 航空宇宙工学専攻 助教

  • 2018年4月 ~ 2019年9月
    日本学術振興会 特別研究員(DC2)

学歴 3

  • 東北大学大学院 工学研究科 航空宇宙工学専攻

    2017年4月 ~ 2019年9月

  • 東北大学大学院 工学研究科 航空宇宙工学専攻

    2015年4月 ~ 2017年3月

  • 東北大学 工学部 機械知能・航空工学科

    2011年4月 ~ 2015年3月

研究分野 3

  • ものづくり技術(機械・電気電子・化学工学) / 流体工学 /

  • エネルギー / プラズマ科学 /

  • フロンティア(航空・船舶) / 航空宇宙工学 /

論文 26

  1. Role of surface discharge dynamics in the generation of electrohydrodynamic force: toward performance improvement of dielectric barrier discharge plasma actuators 招待有り 査読有り

    Shintaro Sato, Naofumi Ohnishi

    Journal of Physics D: Applied Physics 58 (14) 143002-143002 2025年2月20日

    出版者・発行元: IOP Publishing

    DOI: 10.1088/1361-6463/adb3af  

    ISSN:0022-3727

    eISSN:1361-6463

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    Abstract Dielectric barrier discharge (DBD) plasma actuators are devices that actively control the airflow using nonequilibrium atmospheric-pressure plasmas, showing promise for practical applications in the field of aerospace engineering. Numerous studies have revealed the dynamics of surface discharge and the process of generating electrohydrodynamic (EHD) force in detail. The performance of DBD plasma actuators has improved continuously over the past 20 years. However, there is a need for further improvement in EHD force generation to enable the practical applications of DBD plasma actuators. In this review, we provide insights that contribute to the development of a high-performance DBD plasma actuator by reviewing previous studies focused on revealing the surface discharge and EHD force generation processes. The foundations of the discharge process in DBD plasma actuators are briefly described from the perspectives of experiments and numerical simulations. We also reviewed various strategies for improving EHD force generation by optimizing the geometric structure and the applied voltage waveform as well as by controlling the surface charge accumulation. Improving EHD force generation and its efficiency is a fundamental research area to realize the practical applications of a novel active airflow control device that uses nonequilibrium plasmas.

  2. Application of proper orthogonal decomposition to flow fields around various geometries and reduced-order modeling 査読有り

    Yuto Nakamura, Shintaro Sato, Naofumi Ohnishi

    Computer Methods in Applied Mechanics and Engineering 432 117340-117340 2024年12月

    出版者・発行元: Elsevier BV

    DOI: 10.1016/j.cma.2024.117340  

    ISSN:0045-7825

  3. Dynamic instability in lift-type reentry capsule at supersonic flow 査読有り

    Yasuhito Okano, Shintaro Sato, Hiroki Nagai, Naofumi Ohnishi

    Physics of Fluids 36 (7) 2024年7月1日

    出版者・発行元: AIP Publishing

    DOI: 10.1063/5.0217605  

    ISSN:1070-6631

    eISSN:1089-7666

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    Numerical simulations were conducted to investigate dynamic instability of a Japanese lift-type reentry capsule, which is named H-II transfer vehicle Recovery Vehicle (HRV), at Mach 1.2 by comparing two capsule shapes of an original HRV model and a model with a different shoulder angle of 10°. The 10° model has a thicker aft-body with a smaller shoulder angle than the original model. A previous pitch-direction One-Degree Of Freedom (1DOF) experiment revealed that the original model was dynamically stable, whereas the 10° model was dynamically unstable at Mach 1.2. So as to reproduce the same trends as the experiment, a high-order numerical scheme and zonal detached eddy simulation were employed. In fixed angle simulations, we found that the static longitudinal stability of the 10° model is higher than that of the original model in contrast with the observed dynamic stability. 1DOF free oscillation simulations successfully reproduced the same trends as the experiment. We elucidated that the main factor of the dynamic instability of the HRV-type capsule is a hysteresis of a boundary layer separation on the upper side of the capsule. The hysteresis is induced by a variation of momentum in a boundary layer due to capsule motion. We also found that for HRV-type capsules, the lower the static stability within the statically stable range, the higher the dynamic stability might be. In addition, on the lower side, a sign of the work exerted by surrounding flow is different between the original model and the 10° model. A dynamic mode decomposition analysis indicated that the vortex structures on the capsule wake might induce this difference.

  4. Proper orthogonal decomposition method of constructing a reduced-order model for solving partial differential equations with parametrized initial values 査読有り

    Yuto Nakamura, Shintaro Sato, Naofumi Ohnishi

    Partial Differential Equations in Applied Mathematics 100654-100654 2024年2月

    出版者・発行元: Elsevier BV

    DOI: 10.1016/j.padiff.2024.100654  

    ISSN:2666-8181

  5. Ionic wind generation through coplanar discharge: A plasma actuator without exposed electrodes 査読有り

    Shintaro Sato, Mahoro Sakurai, Naofumi Ohnishi

    AIP Advances 13 (6) 2023年6月1日

    出版者・発行元: AIP Publishing

    DOI: 10.1063/5.0150335  

    eISSN:2158-3226

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    This study demonstrates the successful induction of a unidirectional ionic wind by adding an embedded electrode in a coplanar discharge, thus breaking the generation of a symmetrical electric field. The strategy for the ionic wind generation is based on separating the ionization process and the charged-particle acceleration process. Conventional plasma actuators used to induce an ionic wind typically incorporate exposed electrodes that pose a risk of unexpected airflow disturbance and reduce durability due to oxidation. However, the coplanar discharge-based, exposed-electrodeless plasma actuator developed in this study overcomes these issues. The coplanar discharge generates a diffused and uniform surface discharge, a desirable attribute for plasma actuators. The ionic wind velocity generated by this coplanar discharge plasma actuator is comparable to that generated by conventional plasma actuators when applying a square-waveform bias voltage to the additional electrode. Furthermore, this study emphasizes the significance of the phase difference between the repetitive pulses for generating coplanar discharge and the square-waveform voltage for accelerating the charged particles.

  6. Numerical simulation of atmospheric-pressure surface dielectric barrier discharge on a curved dielectric with a curvilinear mesh 査読有り

    Hideto Tamura, Shintaro Sato, Naofumi Ohnishi

    Journal of Physics D: Applied Physics 56 (4) 045202-045202 2023年1月26日

    出版者・発行元: IOP Publishing

    DOI: 10.1088/1361-6463/aca61d  

    ISSN:0022-3727

    eISSN:1361-6463

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    Abstract A numerical simulation method for atmospheric-pressure surface dielectric barrier discharge (DBD) is presented using a structured curvilinear mesh that is fitted to a curved dielectric surface. The numerical method is based on the plasma fluid model with general coordinate transformation, which is widely used in the field of the computational fluid dynamics. The calculations of a potential distribution formed by a line electrode and a planar surface DBD are performed to confirm the validity of the proposed method. We conducted numerical simulations of the DBD on a wavy surface using the proposed method to investigate the characteristics of the DBD on a curved surface. The propagation velocity of the discharge front and the electric field strength of the discharge front changed depending on the surface shape. The proposed method enables the calculation of the DBD on a complex surface and widens the application range of the numerical simulation in the field of discharge physics.

  7. The Effect of SiC-MOSFET Characteristics on the Performance of Dielectric Barrier Discharge Plasma Actuators with Two-Stroke Charge Cycle Operation 査読有り

    Shintaro Sato, Tomoki Yoshikawa, Naofumi Ohnishi

    Actuators 11 (11) 333-333 2022年11月17日

    出版者・発行元: MDPI AG

    DOI: 10.3390/act11110333  

    eISSN:2076-0825

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    The low-voltage operation of a dielectric-barrier-discharge (DBD) plasma actuator with a simple electric circuit has the potential to put it into industrial applications. However, there is an issue that the efficiency of the low-voltage operated DBD plasma actuator is lower than that of the high-voltage operated one. In this study, the characteristics of silicon carbide (SiC) metal-oxide-semiconductor field-effect transistors (MOSFETs), which are used in the electric circuit, are investigated with a focus on the on-state resistance. The on-state resistance of the SiC-MOSFET affects the rise time of the applied voltage in our experimental condition. The energy consumption by applying a pulse voltage to the DBD plasma actuator increases with increasing the on-state resistance. Flow visualization with particle image velocimetry measurement reveals that a DBD plasma actuator with the SiC-MOSFET whose on-state resistance is the lowest induces the highest velocity of the ionic wind. Also, low on-state resistance is preferable in terms of the thrust-to-power ratio. These findings contribute to the development of an optimal power supply for DBD plasma actuators for industrial applications.

  8. Enhancement of electrohydrodynamic force with AC bias voltage in three-electrode dielectric barrier discharge plasma actuators

    Shintaro Sato, Mahoro Sakurai, Naofumi Ohnishi

    Journal of Applied Physics 132 (11) 113301-113301 2022年9月21日

    出版者・発行元: AIP Publishing

    DOI: 10.1063/5.0100696  

    ISSN:0021-8979

    eISSN:1089-7550

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    A novel dielectric barrier discharge (DBD) plasma-actuator module with an exposed electrode and two covered electrodes was developed to enhance electrohydrodynamic force generation based on the concept that it separates the ionization and acceleration processes. The conventional three-electrode configuration of the DBD plasma actuator suffers from unexpected spark discharge between the exposed electrodes, thereby failing to strengthen the electric field intensity for accelerating charged particles or generating a stable ionic wind. In this study, a third electrode was embedded in the dielectric layer to prevent spark discharge. Furthermore, an alternating current (AC) waveform was employed as the bias voltage, which was applied to the third electrode, instead of the direct current (DC) voltage used in a conventional DBD plasma actuator. Induced flow visualization using particle image velocimetry technique revealed that the DC bias voltage forms a weak ionic wind in the proposed DBD plasma actuator owing to the electric field screening effect, and the ionic wind periodically appears when the polarity of the voltage is reversed by applying an AC-bias voltage. The velocity of the ionic wind increases with increasing frequency and the AC bias voltage amplitude. Also, decreasing the distance between the second and third electrodes results in ionic wind enhancement. The results obtained in this study provide insights into the drastic improvement in the performance of DBD plasma actuators with the enhancement of the electric field intensity for charged particle acceleration.

  9. Fabrication and performance evaluation of full-inkjet-printed dielectric-barrier-discharge plasma actuators 査読有り

    Shintaro Sato, Kazuki Nishida, Toshimitsu Hirai, Masaki Ito, Hirofumi Teramae, Masaki Matsubara, Kiyoshi Kanie, Naofumi Ohnishi

    Sensors and Actuators A: Physical 344 113751-113751 2022年9月

    出版者・発行元: Elsevier BV

    DOI: 10.1016/j.sna.2022.113751  

    ISSN:0924-4247

  10. Surface-charge control strategy for enhanced electrohydrodynamic force in dielectric barrier discharge plasma actuators 査読有り

    Shintaro Sato, Kodai Mitsuhashi, Tomoki Enokido, Atsushi Komuro, Akira Ando, Naofumi Ohnishi

    Journal of Physics D: Applied Physics 54 (45) 455203-455203 2021年8月6日

    出版者・発行元: IOP Publishing

    DOI: 10.1088/1361-6463/ac1b5d  

    ISSN:0022-3727

    eISSN:1361-6463

  11. Connections between the modes of a nonlinear dynamical system on a manifold 査読有り

    Shintaro Sato, Hiroki Sakamoto, Naofumi Ohnishi

    Physical Review E 103 (6) 2021年6月9日

    出版者・発行元: American Physical Society (APS)

    DOI: 10.1103/physreve.103.062210  

    ISSN:2470-0045

    eISSN:2470-0053

  12. Development of a flexible dielectric-barrier-discharge plasma actuator fabricated by inkjet printing using silver nanoparticles-based ink 査読有り

    Shintaro Sato, Tomoki Enokido, Kenichiro Ashikawa, Masaki Matsubara, Kiyoshi Kanie, Naofumi Ohnishi

    Sensors and Actuators A: Physical 112823-112823 2021年5月

    出版者・発行元: Elsevier BV

    DOI: 10.1016/j.sna.2021.112823  

    ISSN:0924-4247

  13. Fabrication of a multi-stage plasma synthetic jet actuator using printed electronics 査読有り

    Shintaro Sato, Tomoki Enokido, Naofumi Ohnishi

    AIP Advances 11 (4) 045105-045105 2021年4月1日

    出版者・発行元: AIP Publishing

    DOI: 10.1063/5.0047709  

    eISSN:2158-3226

  14. Development of small high-voltage AC power supply for a dielectric barrier discharge plasma actuator 査読有り

    Kento Suzuki, Atsushi Komuro, Shintaro Sato, Mahoro Sakurai, Kodai Mitsuhashi, Natsuko Sekiya, Yayoi Watanabe, Keito Kanagawa, Akira Ando

    Review of Scientific Instruments 92 (2) 024707-024707 2021年2月1日

    DOI: 10.1063/5.0015377  

    ISSN:0034-6748

    eISSN:1089-7623

  15. Numerical Analysis of Shock Speed Attenuation in Expansion Tube

    Hiroki Sakamoto, Shintaro Sato, Naofumi Ohnishi

    AIAA Scitech 2021 Forum 2021年1月11日

    出版者・発行元: American Institute of Aeronautics and Astronautics

    DOI: 10.2514/6.2021-0058  

  16. Performance Improvement of Dielectric Barrier Discharge Plasma Actuator with Two-Stroke Cycle Operation

    Shintaro Sato, Tomoki Enokido, Kenichiro Ashikawa, Naofumi Ohnishi

    AIAA Scitech 2021 Forum 2021年1月11日

    出版者・発行元: American Institute of Aeronautics and Astronautics

    DOI: 10.2514/6.2021-1492  

  17. Computational Study of Discharge Process in Plasma Actuator for Enhanced Electrohydrodynamic Force Generation toward Low-Voltage Operation 査読有り

    Shintaro SATO, Haruki FURUKAWA, Masayuki TAKAHASHI, Naofumi OHNISHI

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 19 (1) 17-23 2021年

    出版者・発行元: Japan Society for Aeronautical and Space Sciences

    DOI: 10.2322/tastj.19.17  

    ISSN:1884-0485

    eISSN:1884-0485

  18. Experimental demonstration of low-voltage operated dielectric barrier discharge plasma actuators using SiC MOSFETs 査読有り

    Shintaro Sato, Yuta Ozawa, Atsushi Komuro, Taku Nonomura, Keisuke Asai, Naofumi Ohnishi

    Journal of Physics D: Applied Physics 53 (43) 2020年6月29日

    DOI: 10.1088/1361-6463/aba0e1  

    ISSN:0022-3727

    eISSN:1361-6463

  19. A fast solver of plasma fluid model in dielectric-barrier-discharge simulation 査読有り

    Shintaro Sato, Takashi Shiroto, Masayuki Takahashi, Naofumi Ohnishi

    Plasma Sources Science and Technology 29 (7) 2020年6月9日

    出版者・発行元: IOP Publishing

    DOI: 10.1088/1361-6595/ab9b18  

    ISSN:0963-0252

    eISSN:1361-6595

  20. Discharge process and gas heating effect in nanosecond-pulse-driven plasma actuator

    Shintaro Sato, Masayuki Takahashi, Naofumi Ohnishi

    AIAA Scitech 2019 Forum 2019年

    出版者・発行元: American Institute of Aeronautics and Astronautics Inc, AIAA

    DOI: 10.2514/6.2019-1001  

  21. Successively accelerated ionic wind with integrated dielectric-barrier-discharge plasma actuator for low-voltage operation 査読有り

    Sato Shintaro, Furukawa Haruki, Komuro Atsushi, Takahashi Masayuki, Ohnishi Naofumi

    Scientific Reports 9 5813 2019年

    DOI: 10.1038/s41598-019-42284-w  

    ISSN:2045-2322

  22. Induced flow simulation with detailed discharge modeling in dielectric-barrier-discharge plasma actuator

    Shintaro Sato, Masayuki Takahashi, Naofumi Ohnishi

    AIAA Aerospace Sciences Meeting, 2018 (210059) 2018年

    出版者・発行元: American Institute of Aeronautics and Astronautics Inc, AIAA

    DOI: 10.2514/6.2018-1293  

  23. Computational Study of Body Force Production Process and Performance Improvement in Dielectric-Barrier-Discharge Plasma Actuator 査読有り

    Sato Shintaro, Takahashi Masayuki, Ohnishi Naofumi

    Transactions of the Japan Society for Aeronautical and Space Science, Aerospace Technology Japan 16 550 2018年

    DOI: 10.2322/tastj.16.550  

  24. Enhanced electrohydrodynamic force generation in a two-stroke cycle dielectric-barrier-discharge plasma actuator 査読有り

    Shintaro Sato, Masayuki Takahashi, Naofumi Ohnishi

    APPLIED PHYSICS LETTERS 110 (19) 194101 2017年5月

    DOI: 10.1063/1.4983370  

    ISSN:0003-6951

    eISSN:1077-3118

  25. Inuence of voltage waveform on electrohydrodynamic force in a dielectric-barrier-discharge plasma actuator

    Shintaro Sato, Naofumi Ohnishi

    AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting 2017年

    出版者・発行元: American Institute of Aeronautics and Astronautics Inc.

    DOI: 10.2514/6.2017-1804  

  26. Theoretical modeling of pulse discharge cycle in dielectric barrier discharge plasma actuator 査読有り

    Shintaro Sato, Naofumi Ohnishi

    JAPANESE JOURNAL OF APPLIED PHYSICS 55 (7) 07LD04 2016年7月

    DOI: 10.7567/JJAP.55.07LD04  

    ISSN:0021-4922

    eISSN:1347-4065

︎全件表示 ︎最初の5件までを表示

MISC 2

  1. S0530103 DBDプラズマアクチュエータのパルス放電過程における数値解析

    佐藤 慎太郎, 大西 直文

    年次大会 : Mechanical Engineering Congress, Japan 2015 "S0530103-1"-"S0530103-5" 2015年9月13日

    出版者・発行元: 一般社団法人日本機械学会

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    Dielectric barrier discharge (DBD) plasma actuator has been investigated for decades because of its advantages compared to existing flow-control devices. Periodic current pulses are observed when intermittent discharges occur by applying a time-varying voltage. We have conducted two-dimensional simulations of the DBD plasma actuator with a drift-diffusion model. The discharge regime can be classified into two phases. In the first phase, a positive ion cloud is formed at the edge of the exposed electrode due to electron avalanche. A simple theoretical model is proposed, which takes into account time evolution of electron number density at the edge of the exposed electrode using the first Townsend ionization coefficient and provides a good agreement with the result of the numerical simulation. In the second phase, the cloud expands along the dielectric surface, followed by the streamer propagation at a high velocity. The period of streamer discharge cycle becomes shorter as the voltage slope increases. The simulation result shows that the period of the first phase is inversely proportional to the voltage slope, while that of the second phase is inversely proportional to the square of the voltage slope.

  2. DBDプラズマアクチュエータにおけるパルス間隔の理論解析

    佐藤 慎太郎, 大西 直文

    年会講演会講演集 46 5p 2015年4月16日

    出版者・発行元: 日本航空宇宙学会

共同研究・競争的資金等の研究課題 8

  1. 航空機の空力設計を変革する革新的流体低次元モデルの幾何学的定式化

    佐藤 慎太郎

    2024年4月 ~ 2029年3月

  2. 低次元モデルと高次元モデルを融合した機械学習による流動現象の抜本的高速化

    堀江 正信, 佐藤 慎太郎

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research

    研究種目:Grant-in-Aid for Challenging Research (Exploratory)

    研究機関:RICOS Co. Ltd.

    2024年6月 ~ 2027年3月

  3. 電荷制御に基づく革新的イオン風生成技術によるエアロイオニクスの確立

    大西 直文, 佐藤 慎太郎

    2024年4月 ~ 2027年3月

  4. アポステリオリ流体幾何学の創出

    佐藤 慎太郎

    2021年10月 ~ 2025年3月

  5. 羽ばたかずに羽ばたくー非定常空気力学に基づく能動的気流制御システムの確立ー

    佐藤 慎太郎

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

    研究種目:Grant-in-Aid for Early-Career Scientists

    研究機関:Tohoku University

    2021年4月 ~ 2024年3月

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    飛翔生物の羽ばたき動作を模擬する新しい手法として、本研究では固定翼に可動部を持たない気流制御デバイスであるプラズマアクチュエータを搭載し、非定常的に発生する揚力の制御を試みる。初年度では、簡単化のために2次元的な翼を想定し、羽ばたき飛行において重要であると考えられている前縁剥離渦の構造をプラズマアクチュエータを用いて誘起できることを数値計算を用いて実証した。プラズマアクチュエータが生成する電気流体力が流れ場に付与することで、翼の羽ばたき動作によって生じる流れ場と類似した構造が再現できることを確認した。さらに、プラズマアクチュエータの駆動条件や流れ場の条件を変化させた時の計算を実施し、非定常的な空力特性の評価を行った結果、固定翼周り流れにおいて前縁剥離渦を積極的に発生させることで空力特性が向上することを確認した。これによって、従来のプラズマアクチュエータは剥離抑制によって空力性能を向上させてきたが、寧ろプラズマアクチュエータを用いて流れを積極的に剥離させることで翼の性能を向上できる可能性が示唆された。 今後は、流れの3次元的な渦構造について詳細に検討するために Large Eddy Simulation 解析の実施および実証実験を行う予定である。その後、飛翔生物が誘起しているような複雑な3次元渦構造に着目し、3次元翼上に配置されたプラズマアクチュエータ素子群によって任意の次空間分布を持つ電気流体力を発生させることで翼の空力特性を大幅に向上させる手法について検討する。それにより、従来の翼理論の範疇を越える新たな非定常翼理論を確立し、革新的な飛行手法の提案を目標とする。

  6. 表面電荷制御による革新的流体制御技術の確立

    大西 直文, 佐藤 慎太郎, 蟹江 澄志, 野々村 拓, 松野 隆, 小室 淳史

    2020年4月1日 ~ 2023年3月31日

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    以前より取り組んでいた小型化・多電極化によるプラズマアクチュエータ(PA)の低電圧化に引き続き取り組み,多電極化した PA の段を追うごとに加速されていることが PIV(Particle Image Velocimetry)で確認でき,期待通りの性能が 1.5 kV 程度の直流電圧と高速スイッチだけで得られた. 次に,印刷電極によって小型化・多電極化した PA の性能評価を行った.銀ナノインクを用いて電極をインクジェット印刷した後,銅メッキすることで,従来の銅テープを用いた電極と同程度の抵抗値に抑えつつ,電極厚さが小さく加工精度の高い電極を誘電体上に製作することができた.性能評価は PIV による流速の測定,および放電による電磁ノイズの影響を受けにくい振り子式推力計による推力計測を行った.いずれの結果も従来の銅テープ電極を用いた性能に劣るどころか,むしろ性能が向上する結果を得た.走査電子顕微鏡で電極端を観察したところ,印刷電極には印刷時の濡れ性に起因した湾曲構造があり,これと電極厚さが小さくなったことが放電特性を向上させ,結果として気流生成能力も向上させた可能性を示唆している. また,表面電荷を計測するために,ポッケルス素子を用いた表面電位センサの開発を行った.その結果,一般的な表面バリア放電における電位の時空間変化を計測することに成功し,印加する電圧の正負の極性の違いにより誘電体表面の帯電分布に変化が生じることが分かった. さらに,鋸歯電極にした場合のプラズマアクチュエータの誘起速度をシングルピクセル PIV 技術を利用して計測した.鋸歯電極にした場合,誘起速度が安定して高くなることを確認した.またプラズマアクチュエータのバースト駆動による誘起流れを PIV で測定し,パラメータによって流れ場の分類ができることを明らかにした.

  7. 無人航空機のロバスト化に向けたプラズマアクチュエータによる流れの時空間的能動制御 競争的資金

    佐藤 慎太郎

    2018年4月 ~ 2020年3月

  8. 誘電体表面電荷制御に基づく低電圧作動プラズマアクチュエータの開発-小型模型飛行機を用いた実証実験- 競争的資金

    佐藤 慎太郎

    2019年 ~

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