Research

See also: Google Scholar, ORCID

Peer-reviewed papers

1. H Ishii, H Kori. Diffusive coupling facilitates and impedes noise-induced escape in interacting bistable elements. Sci. Rep. 14: 11019 (2024). https://doi.org/10.1038/s41598-024-61058-7
   日本語での研究紹介動画（YouTube, 6分18秒）

2. 石井秀昌，西野成昭．不平等回避により生じる協調ゲームのダイナミクスの変化の理論的分析 ．日本オペレーションズ・リサーチ学会和文論文誌64巻，pp.154-174，(2021)．https://doi.org/10.15807/torsj.64.154

Preprints

1. H. Ishii, Y Takai, Y Marui, Y Yamazaki, Y Kato, H Kori. Uncovering influence of football players' behaviour on team performance in ball possession through dynamical modelling. arXiv:2504.06574 [physics.soc-ph] (2025).

2. H. Ishii, N. Nishino. Asymptotically stable matchings and evolutionary dynamics of preference revelation games in marriage problems. arXiv:2205.08079 [econ.TH] (2022).

International Conferences

1. Hidemasa Ishii, Robert Großmann, Cristina Martinez-Torres, Carsten Beta. Reducing the complexity of phase-field models for cell motility to facilitate data assimilation. ECC11 (the University of Tokyo, Japan), Jul. 30, 2025. [Poster]

2. Hidemasa Ishii, Robert Großmann, Carsten Beta. Reducing the complexity of phase-field models for cell motility. 26th Seminar on “Pattern Formation in Chemistry and Biophysics” (Leucorea, Lutherstadt Wittenberg, Germany), Feb. 22, 2025. [Talk]

3. ISHII Hidemasa, TAKAI Yohei, MARUI Yuichiro, YAMAZAKI Yoshihiro, KATO Yusuke, KORI Hiroshi. Football players' movements that lead to a longer ball possession. SFB1294 International Summer School (Lindner Hotels & Resorts Boltenhagen, Germany), Sep. 16, 2024. [Poster]

4. ISHII Hidemasa, KORI Hiroshi. Coupling strength, network heterogeneity, and transient processes of coupled bistable elements. Kickoff meeting for "Advanced core-to-core network for the physics of self-organizing active matter" (Rohm Theatre Kyoto, Japan), Sep. 12, 2023. [Poster]

5. ISHII Hidemasa, KORI Hiroshi. Transient processes of diffusively coupled bistable elements and network heterogeneity. CoPhEE2023 (the University of Tokyo, Japan), Aug. 14, 2023. [Talk] [slide PDF]

6. ISHII Hidemasa, KORI Hiroshi. Effect of network heterogeneity on transient processes of coupled bistable elements. STATPHYS28 (the University of Tokyo, Japan), Aug. 8, 2023. [Poster] [poster PDF]

Seminars

1. Reducing the complexity of phase-field models for cell motility. Oberseminar: Akutuelle Probleme der Biologischen Physik & SFB1294 Seminar (University of Potsdam: Golm, Germany), Feb. 26, 2025.

2. Employing dynamical modelling to understand complex phenomena: from interacting bistable systems to football ball possession. Seminar on Statistical Physics and Nonlinear Dynamics (Humboldt University Berlin: Adlershof, Germany), Feb. 13, 2025.

3. Employing dynamical modeling to understand complex phenomena: from interacting bistable systems to football ball possession. NAXYS Seminar (Namur Institute for Complex Systems, Belgium), Nov. 26, 2024.

4. Employing dynamical modeling to understand complex phenomena: from interacting bistable systems to football ball possession. Research Seminar Mathematical Models of Photonics (Weierstrass Institute for Applied Analysis and Stochastics, Germany), Nov. 21, 2024.

5. Employing dynamical systems modeling to understand complex phenomena: from interacting bistable systems to football drills. Oberseminar: Akutuelle Probleme der Biologischen Physik & SFB1294 Seminar (University of Potsdam: Golm, Germany), Oct. 16, 2024.

Domestic Conferences

1. 石井秀昌，郡宏．「多数の双安定系が拡散結合した系の平均脱出時間の分析」日本物理学会第80回年次大会（広島大学），Sep. 16, 2025. [Talk]

2. Hidemasa Ishii, Robert Großmann, Carsten Beta. Reducing the complexity of phase-field models for cell motility. 第2回生物普遍性ワークショップ（東京大学生産技術研究所）, Mar. 26, 2025. [Poster]

3. 石井秀昌．「紐帯の強さが振舞いの伝播の速さに及ぼす影響」第76回数理社会学会大会（大阪大学），Mar. 16, 2024. [Talk] [slide PDF]

4. ISHII Hidemasa, KORI Hiroshi. Diffusive coupling facilitates and impedes noise-induced escape in interacting bistable elements. 生物普遍性ワークショップ（レクトーレ湯河原），Feb. 20 & 21, 2024. [Poster] [poster PDF]

5. ISHII Hidemasa, KORI Hiroshi. Weak couplings accelerate noise-induced escapes in interacting bistable elements. Dynamics Days 2023 Kagurazaka (Tokyo University of Science, Japan), Dec. 5, 2023. [Talk]

6. 石井秀昌，郡宏．「大学進学に周囲の生徒が影響を及ぼす場合に予想される現象の検討」第74回数理社会学会大会（筑波大学），Mar. 8, 2023．[Poster] [poster PDF]

7. 石井秀昌，郡宏．「社会的弱者の集団形成を表す離散力学系モデルの構築」第32回日本数理生物学会大会（オンライン），Sep. 6, 2022．[Talk] [slide PDF]

8. 石井秀昌，郡宏．「社会的カテゴリーの形成を表す数理モデルの構築」第73回数理社会学会大会（オンライン），Aug. 27, 2022．[Poster] [slide PDF]

9. 石井秀昌， 他9名．「Twitter 上の懸賞企画における捨てアカウントの特徴とそれを使うユーザの動機の考察」第 15 回テキストアナリティクス・シンポジウム（フューチャー株式会社）， Sep. 28, 2019． [Talk]

Research Visit

1. 2024-09-01 to 2025-02-28 Biological Physics Group, University of Potsdam, Germany (Prof. Dr. Carsten Beta)

2. 2025-02-10 and 13 Theory of Complex Systems and Neurophysics Group, Humboldt University of Berlin, Germany (Dr. Ralf Tönjes)

3. 2025-01-20 to 2025-01-24 ANETI Lab, Corvinus University of Budapest, Hungary (Dr. Luca Gallo)

4. 2025-01-16 Neurophysics Group, University Medical Center Bonn, Germany (Prof. Dr. Klaus Lehnertz)

5. 2024-11-25 to 2024-11-28 Namur Institute for Complex Systems, University of Namur, Belgium (Prof. Dr. Timoteo Carletti)

6. 2024-11-21 Weierstrass Institute for Applied Analysis and Stochastics, Germany (Dr. Jin Yan)

7. 2024-09-25 to 2024-09-27 Workshop on time-series analysis of noisy data 2024 (Lancaster University, UK)

Academic Outreach

1. 石井秀昌．「微分方程式で格差に挑む：物理と社会学の間」10分で伝えます！東大研究最前線（第97回五月祭），May 18 & 19, 2024. [Talk] [slide MP4]

Grant

1. 2024/04 - 2026/03 Grant-in-Aid for JSPS Fellows （特別研究員奨励費）
   JSPS KAKENHI Grant Number JP24KJ0635
   "機会の不平等に人々の相互作用が及ぼす影響の数理モデルによる分析"
   JPY 1,500,000

2. 2023/04 - 2024/03 WINGS-PES Activity Promotion Grant （WINGS-PES活動推進費）
   JPY 340,000