Basic Information

Faculty

• Faculty of Engineering

Email Address

• Email Address

  koike.hajime.7ikyoto-u.ac.jp

Professional Memberships

• From Oct. 2025, To Present

  日本地震予知学会
• From Apr. 2025, To Present

  測位航法学会
• From Feb. 2025, To Present

  計算社会科学会
• From Sep. 2022, To Present

  日本応用数理学会
• From Jun. 2020, To Present

  日本物理学会

Academic Degree

• 26 Mar. 2022

  東京工業大学修士（理学）
• 26 Mar. 2025

  東京科学大学博士（理学）

Academic Resume (Undergraduate School/Majors)

• 京都大学, 理学部理学科, 卒業

Research History

• From Apr. 2025, To Present

  Kyoto University, Graduate School of Informatics, 助教
• From Apr. 2023, To Mar. 2025

  Japan Society for the Promotion of Science, 特別研究員DC2
• From Oct. 2022, To Mar. 2024

  Aoyama Gakuin University, 理工学部数理サイエンス学科, 非常勤助手
• From Apr. 2022, To Mar. 2023

  Tokyo Institute of Technology, Tokyo Tech Advanced Human Resource Development Fellowship for Doctoral Students
• From Apr. 2020, To Mar. 2023

  Tokyo Institute of Technology, 帝国データバンク先端データ解析共同研究講座, リサーチ・アシスタント

ID,URL

• ORCID ID

  0000-0001-6372-2279

• J-Global ID

  202401011706373591

• Researcher number

  31007842

researchmap URL

• https://researchmap.jp/hajimekoike

Research

Research Topics, Overview of the research

• Research Topics

  social physics; econophysics; geodesy

• Overview of the research

  Researches on social/econophysics; mathematical modeling of migration flow, transaction volume flow
  Researches on geodesy; development of ionosphere-lithosphere monitoring system based on GNSS geodesy

Research Areas

• Social infrastructure (civil Engineering, architecture, disaster prevention), Social systems engineering
• Natural sciences, Mathematical physics and basic theory

Papers

• Chaotic solutions found in the gravity model of network transport

  Hajime Koike; Hideki Takayasu; Misako Takayasu

  Physical Review Research, 05 Jun. 2025, Lead author

  
• Bifurcation and hysteresis in a nonlinear transport model on network motifs

  Hajime Koike; Hideki Takayasu; Misako Takayasu

  Physical Review Research, 16 Jan. 2024, Lead author

  
• Diffusion-Localization Transition Point of Gravity Type Transport Model on Regular Ring Lattices and Bethe Lattices

  Hajime Koike; Hideki Takayasu; Misako Takayasu

  Journal of Statistical Physics, Mar. 2022, Lead author

  

Awards

• 31 Mar. 2023

  日本物理学会 領域11学生優秀発表賞

Media Coverage

• We developed quasi real time earthquake anomaly detection system (beta-release).

  PRTIMES, https://prtimes.jp/main/html/rd/p/000000004.000168434.html, Dec. 2025, Internet

  

External funds: Kakenhi

• 人口政策の持続効果・空間相互作用を推定可能な数理モデルの開発

  Grant-in-Aid for Early-Career Scientists

  Basic Section 25010:Social systems engineering-related

  Kyoto University

  小池 元

  From 01 Apr. 2026, To 31 Mar. 2029, Granted

  人口移動;空間相互作用;政策相互作用

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-26K17606/
• マクロ経済データ同化: 理論と実データに整合した最小の国際経済予測システムの開発

  Grant-in-Aid for Research Activity Start-up

  0303:Civil engineering, social systems engineering, safety engineering, disaster prevention engineering, and related fields

  Kyoto University

  小池 元

  From 31 Jul. 2025, To 31 Mar. 2027, Granted

  マクロ経済予測;データ同化

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-25K23479/

Education

Teaching subject(s)

• From 01 Apr. 2026, To 31 Mar. 2027

  System Analysis Laboratory

  9132, Spring, Faculty of Engineering, 4