Okumura Masahiko

オクムラマサヒコ | Okumura Masahiko

Affiliation and department：
Job title： Principal Scientist

Research field (2)： Computational science , Mathematical physics and basic theory

Research theme for competitive and other funds (8)：

2023 - 2025 Creation and validation of an interstellar dust surface model by machine-learning molecular dynamics
2021 - 2024 Application of Rb-K substituted biotite to distinguish K supplying power from Cs retention ability on soil-to-plant transfer of radiocesium
2019 - 2021 Studies on kink structures of phyllo silicates at the atomic scale
2018 - 2021 機械学習分子シミュレーションと実験による粘土鉱物界面水物性の解明
2016 - 2021 福島汚染土壌の減容化と再利用に向けたセシウムフリー鉱化法の開発

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Papers (96)：

Kaori Oguri, Naoto Hagura, Akiko Yamaguchi, Masahiko Okumura, Haruaki Matsuura, Yasumichi Tsunashima, Katsumi Aoki, Yoichi Arai, Sou Watanabe. Characterization of mineral composition using PIXE and EXAFS analyses to elucidate the Barium adsorption mechanism. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 2024. 556. 165516-165516
Koichiro Uno, Masahiko Okumura, Atsushi Nakao, Akiko Yamaguchi, Junta Yanai. Cesium stability on the interlayers of K- or Rb-fixing micaceous minerals investigated by both experimental and numerical simulation methods. Science of The Total Environment. 2024. 949. 1. 175012-175012
Noboru Aoyagi, Ryuhei Motokawa, Masahiko Okumura, Yuki Ueda, Takumi Saito, Shotaro Nishitsuji, Tomitsugu Taguchi, Takumi Yomogida, Gen Sazaki, Atsushi Ikeda-Ohno. Globular pattern formation of hierarchical ceria nanoarchitectures. Communications Chemistry. 2024. 7. 1
Akiko Yamaguchi, Yuichi Kurihara, Kojiro Nagata, Kazuya Tanaka, Shogo Higaki, Tohru Kobayashi, Hajime Tanida, Yoshiyuki Ohara, Keiichi Yokoyama, Tsuyoshi Yaita, et al. Molecular geochemistry of radium: A key to understanding cation adsorption reaction on clay minerals. Journal of Colloid and Interface Science. 2024. 661. 317-332
Keita Kobayashi, Masahiko Okumura, Hiroki Nakamura, Mitsuhiro Itakura, Masahiko Machida, Shingo Urata, Kentaro Suzuya. Machine learning molecular dynamics reveals the structural origin of the first sharp diffraction peak in high-density silica glasses. Scientific Reports. 2023. 13. 1. 18721-1-18721-12

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MISC (118)：

Yamaguchi Akiko, Okumura Masahiko, Takahashi Yoshio*. The First observation of hydrated radium at the molecular level. Isotope News. 2023. 789. 20-23
Uno Koichiro*, Nakao Atsushi*, Okumura Masahiko, Yamaguchi Akiko, Kogure Toshihiro*, Yanai Junta*. Mineralogical factors causing underestimation of $K$$_{\rm d}$ values calculated from radiocesium interception potential. Nihon Dojo Hiryo Gaku Zasshi. 2023. 94. 5. 376-384
Machida Masahiko, Yamada Susumu, Kim M., Okumura Masahiko, Miyamura Hiroko, Shikaze Yoshiaki, Sato Tomoki*, Numata Yoshiaki*, Tobita Yasuhiro*, Yamaguchi Takashi, et al. R\&D of digital technology on inverse estimation of radioactive source distributions and related source countermeasures; R\&D status of digital platform including 3D-ADRES-indoor. RIST News. 2023. 69. 69. 2-18
Keita Kobayashi, Hiroki Nakamura, Mitsuhiro Itakura, Masahiko Machida, Masahiko Okumura. Machine Learning Molecular Dynamics Simulations for Evaluation of High-Temperature Properties of Nuclear Fuel Materials. Materia Japan. 2023. 62. 3. 175-181
Machida Masahiko, Yamada Susumu, Kim M., Okumura Masahiko, Miyamura Hiroko, Malins A., Shikaze Yoshiaki, Sato Tomoki*, Numata Yoshiaki*, Tobita Yasuhiro*, et al. R\&D of digital technology on inverse estimation of radioactive source distributions and related source countermeasures; R\&D status of digital platform including 3D-ADRES-indoor. RIST News. 2022. 68. 3-19

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Lectures and oral presentations (232)：

Machine learning molecular dynamics; Fundamentals and applications
Elementary processes in biotite weathering investigated by complementary use of XANES high-resolution measurements and first-principles calculations
(2024年度日本地球化学会第71回年会)
Oxidation reaction of Fe in weathered biotite investigated by XANES simulation and high-resolution measurement
(日本放射化学会第68回討論会(2024))
Weathering mechanisms of biotite investigated by the combination of experiment and simulation of XANES spectra
(日本原子力学会2024年秋の大会)
Evaluation of physical properties of plutonium dioxide using machine-learning molecular dynamics
(日本原子力学会2024年秋の大会)

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Education (4)：

2000 - 2004 Waseda University Graduate School of Science and Engineering Department of Physics and Applied Physics
1998 - 2000 Waseda University Graduate School of Science and Engineering Department of Physics and Applied Physics
1995 - 1998 Waseda University School of Science and Engineering Department of Applied Physics
1994 - 1995 Waseda University School of Science and Engineering Department of Resources

Professional career (1)：

Ph.D. (Waseda University)

Work history (8)：

2019/10 - 現在 Japan Atomic Energy Agency Center for Computational Science & e-Systems Principal Scientist
2013/10 - 2019/09 Japan Atomic Energy Agency Center for Computational Science & e-Systems Senior Scientist
2012/07 - 2013/09 Japan Atomic Energy Agency Center for Computational Science & e-Systems Senior Post-Doctoral Fellow
2011/12 - 2012/06 Japan Atomic Energy Agency Headquarters of Fukushima Partnership Operations Special Topic Researcher
2011/05 - 2011/11 Japan Atomic Energy Agency Center for Computational Science & e-Systems Senior Post-Doctoral Fellow

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Committee career (3)：

2024/04 - 現在日本原子力学会計算科学技術部会副部会長
2022/04 - 2024/03 日本原子力学会計算科学技術部会総務委員長
2019/04 - 2022/03 日本原子力学会計算科学技術部会総務委員

Association Membership(s) (4)：

American Chemical Society , 日本地球化学会 , 日本原子力学会 , 日本物理学会

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