Okumura Masahiko

オクムラマサヒコ | Okumura Masahiko

Affiliation and department：
Job title： Principal Scientist

Research field (1)： 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 (92)：

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
Hideki Mori, Tomohito Tsuru, Masahiko Okumura, Daisuke Matsunaka, Yoshinori Shiihara, Mitsuhiro Itakura. Dynamic interaction between dislocations and obstacles in bcc iron based on atomic potentials derived using neural networks. Physical Review Materials. 2023. 7. 6. 063605-1-063605-8
Keita Kobayashi, Akiko Yamaguchi, Masahiko Okumura. Machine learning potentials of kaolinite based on the potential energy surfaces of GGA and meta-GGA density functional theory. Applied Clay Science. 2022. 228. 106596-106596
Akiko Yamaguchi, Kojiro Nagata, Keita Kobayashi, Kazuya Tanaka, Tohru Kobayashi, Hajime Tanida, Kojiro Shimojo, Tetsuhiro Sekiguchi, Yui Kaneta, Shohei Matsuda, et al. EXAFS spectroscopy measurements and ab initio molecular dynamics simulations reveal the hydration structure of the radium(II) ion. iScience. 2022. 25. 8. 104763-104763

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MISC (117)：

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
Yamaguchi Akiko, Nagata Kojiro*, Tanaka Kazuya, Kobayashi Keita, Kobayashi Toru, Shimojo Kojiro, Tanida Hajime, Sekiguchi Tetsuhiro, Kaneta Yui, Matsuda Shohei, et al. Investigation of hydration and adsorption structures on clay minerals of radium by EXAFS. Hosha Kagaku. 2022. 45. 28-30

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Lectures and oral presentations (216)：

Machine learning molecular dynamics simulation of ice and water
(学術変革領域研究(A)「次世代アストロケミストリー; 素過程理解に基づく学理の再構築」第4回領域全体集会)
The Development of integrated machine-learning molecular dynamics system and its applications
(日本原子力学会2024年春の年会)
Large-scale molecular dynamics simulation of cesium diffusion in clay mineral-water systems
(日本原子力学会2024年春の年会)
Machine learning molecular dynamics simulations of materials with complex structures
(7th International Symposium on Frontiers in Materials Science (FMS 2024) 2024)
Evaluation of local structure and bonding state of the adsorbed cation on clay minerals with multi adsorption sites
(日本地球化学会第70回年会)

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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)：

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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