Updated on 2024/12/26

写真a

 
HASEGAWA MAKOTO
 
Organization
Research Institute for Applied Mechanics Division of Nuclear Fusion Dynamics Associate Professor
Research Institute for Applied Mechanics Advanced Fusion Research Center(Concurrent)
Interdisciplinary Graduate School of Engineering Sciences Department of Interdisciplinary Engineering Sciences(Concurrent)
Title
Associate Professor
Contact information
メールアドレス
Tel
0925837988
Profile
Study on the plasma control of tokamak plasma with machine learning. Study and Development on data acquisition system, and control systems for large plant. Study on the plasma breakdown induced by micro & milli waves and static electric fields for tokamak devices.
Homepage
  • http://www.triam.kyushu-u.ac.jp/

    Advanced Fusion Research Center, Research Institue for Applied Mechanics

  • http://sv02.triam.kyushu-u.ac.jp/idoken/

    High energy Material science and technology studies, Plasma and Material Engineering Science, Department of Advanced Energy Engineering Science, Interdisciplinary Graduate School of Engineering Sciences Kyushu University

Degree

  • Doctor of engineering

Research History

  • Kyushu University Research Institute for Applied Mechanics Division of Nuclear Fusion Dynamics  Associate Professor 

    2007.3 - Present

  • TDK株式会社(1997,4-2000,7)   

    TDK株式会社(1997,4-2000,7)

Research Interests・Research Keywords

  • Research theme: Development of plasma control method using machine learning such as reinforcement learning

    Keyword: Machine learning, reinforcement learning, neural networks

    Research period: 2022.4 - 2028.3

  • Research theme: A plasma shape identification and its real-time control on steady-state operation of ST tokamak

    Keyword: plasma shape, real-time, control, steady state operation

    Research period: 2011.4

  • Research theme: Development of Integrated Control Method for stedy-state operation on Tokamak Plasma

    Keyword: Integrated Control, Tokamak, steady-state operation, large database

    Research period: 2010.4

  • Research theme: The development of integrated experimental system for large-scale plasma experiments

    Keyword: remote participation, data acquisition, supervision & control system, large-scale plasma experiment, IoT (Internet of Things)

    Research period: 2003.10

  • Research theme: 高周波ならびに誘導電場による初期プラズマ生成に関する研究

    Keyword: Townsend avalanche, プラズマ, マイクロ波, ブレークダウン

    Research period: 2000.7

Awards

  • プラズマ・核融合学会 第25回技術進歩賞 「QUEST 高温壁による水素リサイクリング制御技術の開発と長時間放電の実現」

    2020.10   プラズマ・核融合学会   「QUEST 高温壁による水素リサイクリング制御技術の開発と長時間放電の実現」定常核融合炉を実現するためには,熱・粒子制御をはじめとして,長時間定常運転に係る多くの解決すべき技術的課題があるが,その中でも,核融合炉で想定される金属壁環境における水素リサイクリングに関する課題は,プラズマの長時間定常維持のみならず,プラズマ性能にも影響を及ぼすため,その制御技術の確立は重要である.このような水素リサイクリングの制御技術の確立に向けて,本研究グループは壁温度に着目して,水素リサイクリング率の壁温依存性を確認した点は独創的なアプローチと認められる.一連の研究は金属壁化した核融合実験装置 QUEST を用いて行われ,W コートした金属壁の温度制御技術の開発,長時間放電プラズマに曝露した試料の詳細な分析,堆積層を伴う金属壁での水素リサイクリングのモデル化,等を系統的に実施し,壁温をコントロールして 1 時間を越える長時間放電を QUEST において実現している.このように,水素リサイクリング 制御に壁温度という新しい制御ノブの有効性を示した本技術は,今後の定常核融合炉へ向けた研究の発展に貢献することが期待されることから,「技術進歩賞」に値すると判断できる.

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    核融合発電を志向したトカマクプラズマでは定常運転の実現が重要な課題となっている。真空容器内の核融合燃料を適切に維持するためには水素リサイクリングと呼ばれる現象の理解が重要であり、これはプラズマ抵抗壁の温度が重要なキーパラメータと考えられている。従来は、この温度変化は受動的であったが、QUEST装置ではこの温度を能動的に制御することを試みた野心的な装置であり、この能動的な制御を行うことによって定常運転の運転領域が広げられることを示唆し、定常運転の実現に向けて重要な知見を得ることができた。

Papers

  • QUEST Database for Tokamak Big Data Reviewed International journal

    @Makoto HASEGAWA, @Aki HIGASHIJIMA, @Ichiro NIIYA, @Kazuaki HANADA, @Hiroshi IDEI, @Takeshi IDO, @Ryuya IKEZOE, @Takumi ONCHI, @Kengo KURODA and @Daisuke SAKURAI

    Plasma and Fusion Research   18 ( 0 )   1305048-1 - 1305048-4   2023.5   ISSN:1880-6821 eISSN:18806821

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Plasma Science and Nuclear Fusion Research  

    <p>A database has been developed to provide a highly efficient data analysis environment by registering various types of data obtained in the QUEST (Q-shu University Experiment with Steady-State Spherical Tokamak) experiments and providing the data to researchers through standard SQL query output. In conventional experiments, measurements are usually obtained using several instruments, and the results are often stored separately in proprietary formats. An analysis to collect distributed files and convert them into appropriate formats individually was necessary, which led to a decrease in analysis efficiency. In order to build a system to centrally store and provide data, we constructed new servers, each for registering data in a database and for extracting data from the database and visualizing the data. As a result, various real-time monitoring data can be registered in the database, and data retrieval for analysis can be performed easily with a unified user interface. The construction of this database has made it possible to easily retrieve real-time monitoring data and a wide variety of table data, enabling analysis from a new perspective, and improving analysis efficiency.</p>

    DOI: 10.1585/pfr.18.1305048

    Web of Science

    Scopus

    CiNii Research

    Repository Public URL: https://hdl.handle.net/2324/6790351

  • Towards automated gas leak detection through cluster analysis of mass spectrometer data Reviewed International journal

    @Makoto Hasegawa, @Daisuke Sakurai, @Aki Higashijima, @Ichiro Niiya, @Keiji Matsushima, @Kazuaki Hanada, @Hiroshi Idei, @Takeshi Ido, @Ryuya Ikezoe, @Takumi Onchi, @Kengo Kuroda

    Fusion Engineering and Design   180   113199   2022.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    In order to generate high-performance plasma for future fusion power generation, it is desirable to keep high quality vacuum during experiment. Mass spectrometer is commonly used to monitor the vacuum quality and to record the amount of atoms and molecules in the vacuum vessel. Leak is the most serious accident to avoid that can nullify an experiment and even harm researchers. Detecting leaks are ever more important since it can be easily overlooked, e.g., when the deterioration in the vacuum degree is modest. This forces the researcher to carefully observe the vacuum and mass spectrometer data. This article presents a way to suggest potential leaks in the vacuum vessel by analyzing mass spectrometer data. This is done by utilizing the Euclidean distance between composition ratios at different times for the clustering using the daily composition ratio. We show that our cluster analysis is an effective way of separating these two cases, which results in a semi-automatic determination of leaks is more efficient than the current norm, which is to check many measures to find a small abnormality in the data manually. We plan further model improvements for long-term evaluation.

    DOI: https://doi.org/10.1016/j.fusengdes.2022.113199

    Repository Public URL: https://hdl.handle.net/2324/4796022

  • Extension of Operation Region for Steady State Operation on QUEST by Integrated Control with Hot Walls Invited Reviewed International journal

    @Makoto HASEGAWA, @Kazuaki HANADA, @Naoaki YOSHIDA, @Hiroshi IDEI, @Takeshi IDO, @Yoshihiko NAGASHIMA, @Ryuya IKEZOE, @Takumi ONCHI, @Kengoh KURODA, @Shoji KAWASAKI, @Aki HIGASHIJIMA, @Takahiro NAGATA, @Shun SHIMABUKURO and @Kazuo NAKAMURA

    Plasma and Fusion Research   16 ( 2402034 )   2402034-1 - 2402034-8   2021.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    The controllability of particle supply during long-term discharge in a high-temperature environment was investigated at the Q-shu University Experiment with steady state spherical tokamak (QUEST). QUEST has a high-temperature wall capable of active heating and cooling as a plasma-facing wall. With this hot wall, a temperature rise test was conducted with 673K as the target temperature. It was confirmed that the hot wall could maintain the temperature above 600 K. Feedback control of particle fueling was conducted to control Hα
    emission, which is closely related to influx to the wall. Using this particle fueling control and setting the hot wall temperature to 473 K, it was possible to obtain a discharge of more than 6 h. In this discharge, the fueling rate of particles decreased with time, and finally became zero, losing the particle fueling controllability. However, as soon as the cooling water started to flow through the hot wall, particles could be supplied again, and controllability was restored. Thus, indicating that temperature control of the plasma first wall is important even in the high temperature environment of 473K to control particle retention of the wall.

    DOI: 10.1585/pfr.16.2402034

    Other Link: http://www.jspf.or.jp/PFR/PFR_articles/pfr2021/pfr2021_16-2402034.html

    Repository Public URL: https://hdl.handle.net/2324/7183075

  • Predictive maintenance and safety operation by device integration on the QUEST large experimental device Reviewed International journal

    @Makoto Hasegawa, @Kazuaki Hanada, @Hiroshi Idei, @Shoji Kawasaki, @Takahiro Nagata, @Ryuya Ikezoe, @Takumi Onchi, @Kengoh Kuroda, @Aki Higashijima

    Heliyon   6   e04214   2020.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    As technology has improved in recent years, it has become possible to create new valuable functions by combining various devices and sensors in a network. This concept is referred to as the Internet of Things (IoT), and predictive maintenance is a new valuable function associated with the IoT. In large-scale experimental facilities with many researchers, it is not desirable that experiments cannot be performed due to sudden failure of equipment. For this reason, it is important to predict the failure in advance based on the measurement results of sensors and to perform repairs in a planned manner. On the Q-shu University experiment with steady-state spherical tokamak (QUEST) large experimental device, it is necessary to drive a large current of 50 kA, and the diagnosis of its power line deterioration is well performed as predictive maintenance through the evaluation of its contact resistances of several micro ohms order on the network. In addition, as an example of the IoT, mechanisms to assist safe operation, such as a sound alarm system and an entrance management system, are built by sharing experimental information between devices via the network.

    DOI: https://doi.org/10.1016/j.heliyon.2020.e04214

    Repository Public URL: https://hdl.handle.net/2324/7183074

  • Modification of plasma control system and hot-wall temperature control system for long-duration plasma sustainment in QUEST Reviewed International journal

    Makoto Hasegawa, Kazuo Nakamura, Kazuaki Hanada, Shoji Kawasaki, Arseniy Kuzmin, Hiroshi Idei, Kazutoshi Tokunaga, Yoshihiko Nagashima, Takumi Onchi, Kengoh Kuroda, Osamu Watanabe, Aki Higashijima, Takahiro Nagata

    Fusion Engineering and Design   129   202 - 206   2018.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    In tokamaks, the temperature of the plasma-facing wall is an important parameter for achieving particle balanceand therefore steady-state operation. QUEST, which is a middle-sized spherical tokamak, has hot walls that act asplasma-facing walls. They can be actively heated with sheath heaters and actively cooled with water. To controlthe wall temperature, heating and cooling systems have been developed. These systems adjust the power of thesheath heaters and the motor valves of the cooling system, respectively. The two systems communicate viaEthernet through UDP and control the hot-wall temperature cooperatively. The plasma control system (PCS) inQUEST has also been modified, especially with respect to gas fueling, in order to enable long-duration plasmasustainment. A feedback controller has been installed in the PCS, together with a mass flow controller, allowingHα emission from the plasma which is used as a reference signal, to be well controlled. Plasma density calculationsusing a field-programmable gate array are proposed for the feedback control system.

    DOI: 10.1016/j.fusengdes.2018.02.069

    Repository Public URL: https://hdl.handle.net/2324/7183073

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Presentations

  • トカマクプラズマ位置形状の機械学習を用いた高速同定

    @長谷川 真,@井戸 毅,@花田 和明, @出射 浩, @池添 竜也, @恩地 拓己, @木下 稔基

    令和6年電気学会全国大会  2024.3 

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    Event date: 2024.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学 常三島キャンパス   Country:Japan  

    Repository Public URL: https://hdl.handle.net/2324/7183076

  • クエストのプラズマ制御システムと機械学習によるプラズマ形状の高速同定

    長谷川 真, QUEST Group

    第19回クエスト研究会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 クエスト実験棟2階会議室   Country:Japan  

    Repository Public URL: https://hdl.handle.net/2324/7183077

  • Plasma control system of QUEST and fast plasma shape recognition with Machine Learning International conference

    @Makoto Hasegawa, and QUEST Group

    12th QUEST Workshotp "RF startup and sustainment in Spherical Tokamak"  2024.2 

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    Event date: 2024.2

    Language:English   Presentation type:Symposium, workshop panel (public)  

    Venue:2F Meeting room, Advanced Fusion Research Center, Kyushu Univ.   Country:Japan  

    Repository Public URL: https://hdl.handle.net/2324/7183078

  • QUESTの長時間運転における計測と制御 Invited

    @長谷川 真, and QUESTグループ

    第25回若手科学者によるプラズマ研究会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:量子科学技術研究開発機構 那珂研究所, Online meeting   Country:Japan  

    Repository Public URL: https://hdl.handle.net/2324/7183079

  • 共同利用装置QUESTの実験環境および実験データについて

    @長谷川 真, and QUESTグループ

    第18回クエスト研究会  2022.9 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Online meeting   Country:Japan  

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MISC

  • 国内大学のトカマク実験装置の概観 Reviewed

    @藤田隆明, @渡邊清政, @岡本征晃, @柴田欣秀, @大野哲靖, @打田正樹, @田中仁, @前川孝, @筒井広明, @長谷川真, @井上孟流, @稲垣秦一郎, @三瓶明希夫, @比村治彦, @政宗貞男, @岡本敦, @江尻晶, @辻井直人, @篠原孝司

    NIFS report   2023.6

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    A study group on experimental research for advanced tokamaks (represented by T. Fujita) was organized and held meetings from FY 2020 to FY 2022 as one of general collaboration projects of National Institute for Fusion Science (NIFS). In meetings held in October 2021 and September 2022, topical sessions were organized on overview of individual experiment devices. Nine research groups made presentations in these topical sessions, with fruitful discussions. This report includes commentary articles on experimental devices written by seven research groups; HYBTOK-II, LATE, PHiX, QUEST, RELAX, TOKASTAR-2 and TST-2. It contains useful information on constitutions, know-how on operation, analysis tools, etc. It is expected that this report would be utilized for improvements in individual devices.

  • ITERに向けた遠隔実験の現状 Status of Remote Experiments for ITER 2.2 LHD等における遠隔実験

    長谷川 真, 中西 秀哉, 吉川 正志

    Journal of Plasma and Fusion Research   2013.7

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    Language:Japanese  

Works

  • 計測データのグラフ提供サーバの構築

    @長谷川 真, @東島 亜紀, @新谷 一朗, @関谷 泉, @櫻井 大督

    2023.4

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    共同利用・共同研究拠点である九州大学 応用力学研究所内に設置されているトカマク装置QUESTにて収集された計測データを、共同研究者等の利用者に対してWEB上でグラフ形式でデータを提供するサーバーの構築を行った。
    内容および作成したコードについては、下のリンクで公開している。
    https://gitlab.com/quest_dev/db_graph_plot

  • トカマクプラズマの平衡計算コード

    @長谷川 真

    2022.7

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    Code for calculating plasma equilibrium in a tokamak device. Calculate reasonable plasma equilibria from coil currents, plasma currents, and other magnetic measurements.
    Moreover, this equilibrium calculation code can be widely applied not only to a specific tokamak device but also to a general tokamak device.

  • 実験データ等を集中管理する大容量データベースの構築

    長谷川真, 櫻井大督, 東島亜紀, 新谷一郎, 松島啓二

    2020.12

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    従来は計測データは、各計測器で計測され、各々の計測器にファイル形式で保管されることが多かった。この場合、多様なデータを総合的に解析しようとすると、各計測器に保存されているデータファイルを探し出し、それらデータを専用のソフトウェアで読み込む必要があるなど、多大な労力を必要としていた。そこで、データを集中的に保管して、データへのアクセスを統一させた大容量データベースの構築を行った。

  • 実験データ等を集中管理する大容量データベースの構築

    長谷川真, 櫻井大督, 東島亜紀, 新谷一郎, 松島啓二

    2020.12

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    従来は計測データは、各計測器で計測され、各々の計測器にファイル形式で保管されることが多かった。この場合、多様なデータを総合的に解析しようとすると、各計測器に保存されているデータファイルを探し出し、それらデータを専用のソフトウェアで読み込む必要があるなど、多大な労力を必要としていた。そこで、データを集中的に保管して、データへのアクセスを統一させた大容量データベースの構築を行った。

    researchmap

  • 実験を安全に行うための実験設備本体室の入室管理システムの開発

    長谷川真

    2018.1

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    プラズマを生成する実験設備では、安全上、プラズマ生成中は実験設備本体室の入室が禁じられている。本体室に人がいる状態で、誤ってプラズマを生成しないように警報音等の各種安全装置を設けているが、本入室管理システムもその一環に当たる。複数個所の出入り口に設置することが可能で、WiFi付ポケットサイズPCとタッチパネルを用いて省力で設置できるようにしてある。入退室時に自身の名前のボタンをタッチパネルでタッチする。中央制御装置と連動して入室者がある場合には、プラズマ生成のシーケンスは停止される。

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Industrial property rights

Patent   Number of applications: 5   Number of registrations: 5
Utility model   Number of applications: 0   Number of registrations: 0
Design   Number of applications: 0   Number of registrations: 0
Trademark   Number of applications: 0   Number of registrations: 0

Professional Memberships

  • (社)日本物理学会

  • (社)プラズマ・核融合学会

  • The Institute of Electrical Engineers of Japan

  • (社)日本物理学会

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  • (社)プラズマ・核融合学会

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Academic Activities

  • Screening of academic papers

    Role(s): Peer review

    2022

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:2

  • Screening of academic papers

    Role(s): Peer review

    2020

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    Type:Peer review 

    Proceedings of International Conference Number of peer-reviewed papers:1

  • Screening of academic papers

    Role(s): Peer review

    2019

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

Research Projects

  • 軸対称プラズマの閉じ込め性能のアスペクト比依存性の起源の解明

    Grant number:24K00613  2024.4 - 2028.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    井戸 毅, 長谷川 真, 木下 稔基, 森高 外征雄, 中村 浩章

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    Grant type:Scientific research funding

    低アスペクト比(トーラス形状の大半径Rと小半径aの比: R /a)を持つ球状トカマクは基本的な磁場構造は標準的なトカマクと同じであるにもかかわらず、そのエネルギー閉じ込め時間の物理パラメータ依存性は、標準的なトカマクのそれと大きく異なっている。本研究は、アスペクト比を球状トカマクから標準的なトカマクの領域まで変化させることができるプラズマ生成手法を開発し、ここに静電乱流と電磁乱流の計測システムと数値シミュレーションシステムを導入することにより、乱流輸送の観点からプラズマ閉じ込めのアスペクト比依存性の物理機構の解明に取り組む。

    CiNii Research

  • 研究データエコシステム「プラズマ・核融合クラウド」構築と関連技術の高度化

    2024.4 - 2025.3

    Joint research

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid)  Grant type:Other funds from industry-academia collaboration

  • QUESTにおけるプラズマ断面再構成の高度化研究

    2024.4 - 2025.3

    Joint research

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid)  Grant type:Other funds from industry-academia collaboration

  • 水平磁場コイルによる垂直位置安定制御に関する検討

    2024.4 - 2025.3

    Joint research

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • QUESTにおける誘導電流駆動によるダイバータ配位の制御と位置不安定性の予測

    2024.4 - 2025.3

    Joint research

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid)  Grant type:Other funds from industry-academia collaboration

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Educational Activities

  • As a collaborative course instructor of the Interdisciplinary Graduate School of Engineering Sciences (IGSES), I participate in guidance by giving advice on experiments and research of graduate students mainly using the large plasma experimental device QUEST.

Class subject

  • 機械学習応用概論

    2024.4 - 2024.9   First semester

  • プラズマ理工学演習

    2023.10 - 2024.3   Second semester

  • プラズマ理工学演習

    2022.10 - 2023.3   Second semester

Social Activities

  • プログラミング言語LabVIEWを用いて「音」をプログラミングしてみよう!! / 制御システムで使われることの多いプログラミング言語LabVIEWを用いて、音を生成する簡単なプログラミングを行い、論理的思考などを育む。

    九州大学応用力学研究所高温プラズマ理工学研究センター  九州大学応用力学研究所高温プラズマ理工学研究センター クエスト実験棟2F制御室  2023.12

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

    九州大学筑紫キャンパスの春日高校連携事業にて、令和5年度12月26日のクエスト実験棟施設見学に伴い実施した。

  • プログラミング言語LabVIEWを用いて「音」をプログラミングしてみよう!! / 制御システムで使われることの多いプログラミング言語LabVIEWを用いて、音を生成する簡単なプログラミングを行い、論理的思考などを育む。

    九州大学応用力学研究所高温プラズマ理工学研究センター  九州大学応用力学研究所高温プラズマ理工学研究センター クエスト実験棟2F制御室 2023年度筑紫キャンパス学内開放に合わせて実施した。  2023.5

     More details

    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

Travel Abroad

  • 2014.9 - 2014.10

    Staying countory name 1:Spain   Staying institution name 1:28th Symposium on Fusion Technology

  • 2013.11

    Staying countory name 1:Korea, Republic of   Staying institution name 1:9TH Asia Plasma and Fusion Association Conference

  • 2005.6 - 2005.8

    Staying countory name 1:United States   Staying institution name 1:プリンストン・プラズマ物理学研究所