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Theory on the Analysis of Spot Solution Motion in Reaction-Diffusion Systems on Bounded Domains

Research Project

Project/Area Number 23K22400
Project/Area Number (Other) 22H01129 (2022-2023)
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeMulti-year Fund (2024)
Single-year Grants (2022-2023)
Section一般
Review Section Basic Section 12020:Mathematical analysis-related
Research InstitutionJosai University (2024)
Hokkaido University (2022-2023)

Principal Investigator

EI SHIN-ICHIRO  城西大学, 理学部, 教授 (30201362)

Co-Investigator(Kenkyū-buntansha) 黒田 紘敏  北海道大学, 理学研究院, 准教授 (80635657)
Project Period (FY) 2024-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2024: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2023: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Keywords反応拡散系 / スポット解 / 進行波 / 相互作用 / メトリックグラフ / パルス解 / メトリックグラ / 反応拡散型モデル / 境界との相互作用
Outline of Research at the Start

樟脳片運動の数理モデルにおける樟脳片や交通流方程式における自己駆動粒子, あるいは神経伝搬方程式における神経パルスなど, それぞれの数理モデルにおいて局在スポットパターンは, 重要なキーとなる解として出現する.それらスポットパターンの運動を, 一般の領域において境界などの影響を取り込んだ形で解析することを目標とする.本研究課題では領域の境界やその拡張としての領域内部に存在する障害物, あるいはネットワーク上のノードなど, 多様な領域と境界に対して, その影響を取り入れたスポット解の重心位置に関する運動方程式導出のための理論構築を行う.

Outline of Final Research Achievements

For spot solutions appearing in multivariable reaction-diffusion mathematical models, we have established a general theoretical foundation to examine the influence of domain shape and boundary conditions on solution behavior. Additionally, for specific domains such as disk-shaped regions, regions with boundaries that are nearly straight, regions with obstacles, or metric graphs with Kirchhoff boundary conditions, we have rigorously derived concrete equations of motion from the abstract results indicated by the general theory. As an example, when spot solutions exhibit repulsive interactions, we have demonstrated that on metric graphs, motions such as approaching junction points or moving towards thicker paths can occur. Furthermore, we have successfully analyzed the motion of spot solutions based on the shape of obstacles.

Academic Significance and Societal Importance of the Research Achievements

領域形状や境界条件がスポット解に与える影響は, これまで数値シミュレーションを中心に行われてきたが, 理論的に解析するための手法を与えることは, これまで経験的に行われてきた相互作用解析に確固たる数学的基盤を与え, なにが正しい答であるのかを明白にすることができるという点で学術的に意義がある.また, 応用範囲も広く, 実際に近い神経網における神経パルスの伝搬や障害物周りの散乱現象を正確に捉えるための理論的手法を与えることができることから, 数理科学のみならず, 生命系や工学系の問題への適用も期待され, 社会的な意義も十分に備えている.

Report

(4 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Annual Research Report
  • 2022 Annual Research Report
  • Research Products

    (28 results)

All 2025 2024 2023 2022 2021 Other

All Int'l Joint Research (3 results) Journal Article (10 results) (of which Int'l Joint Research: 2 results,  Open Access: 5 results,  Peer Reviewed: 5 results) Presentation (11 results) (of which Int'l Joint Research: 7 results,  Invited: 10 results) Remarks (2 results) Funded Workshop (2 results)

  • [Int'l Joint Research] Taiwan University (台湾)/Tunghai University (台湾)/Hsing Hua University (台湾)(その他の国・地域)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] Taiwan University/Tunghai University/Hsing Hua University(その他の国・地域 (Taiwan))

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] TKU/NCTS(その他の国・地域 (Taiwan))

    • Related Report
      2022 Annual Research Report
  • [Journal Article] 反応拡散方程式 (1) パターン形成と反応拡散型数理モデル,2025

    • Author(s)
      栄 伸一郎
    • Journal Title

      数学セミナー

      Volume: 64, 1_759 Pages: 57-63

    • Related Report
      2024 Annual Research Report
  • [Journal Article] 反応拡散方程式 (2) 反応拡散系に現れるパターン2025

    • Author(s)
      栄伸一郎
    • Journal Title

      数学セミナー

      Volume: 64, 2_760 Pages: 62-67

    • Related Report
      2024 Annual Research Report
  • [Journal Article] 反応拡散方程式 (3) パターンの形成過程,2025

    • Author(s)
      栄伸一郎
    • Journal Title

      数学セミナー

      Volume: 64, 3_761 Pages: 79-85

    • Related Report
      2024 Annual Research Report
  • [Journal Article] パターン形成とその縮約, フォーラム2024

    • Author(s)
      栄 伸一郎
    • Journal Title

      応用数理

      Volume: 34 Pages: 59-63

    • Related Report
      2024 Annual Research Report
    • Open Access
  • [Journal Article] 動かぬ点の拡がりを追う, 特集・不動点の世界2024

    • Author(s)
      栄 伸一郎
    • Journal Title

      数理科学

      Volume: 734 Pages: 5-6

    • Related Report
      2024 Annual Research Report
  • [Journal Article] The dynamics of pulse solutions for reaction diffusion systems on a star shaped metric graph with the Kirchhoff's boundary condition2023

    • Author(s)
      Shin-Ichiro Ei; Ken Mitsuzono;Haruki Shimatani
    • Journal Title

      DCDS-B

      Volume: 28 Issue: 12 Pages: 12-12

    • DOI

      10.3934/dcdsb.2022209

    • Related Report
      2023 Annual Research Report 2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Bifurcation of co-existing traveling wave solutions in a three-component competition--diffusion system2023

    • Author(s)
      Shin-Ichiro Ei, Hideo Ikeda, Toshiyuki Ogawa
    • Journal Title

      Physica D

      Volume: 448 Pages: 133703-133703

    • DOI

      10.1016/j.physd.2023.133703

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Alien invasion into the buffer zone between two competing species2023

    • Author(s)
      Shin-Ichiro Ei, Hideo Ikeda, Toshiyuki Ogawa
    • Journal Title

      Discrete and Continuous Dynamical Systems - Series B

      Volume: 28 Issue: 12 Pages: 6034-6063

    • DOI

      10.3934/dcdsb.2023081

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Oscillations and bifurcation structure of reaction?diffusion model for cell polarity formation2022

    • Author(s)
      Kuwamura Masataka、Izuhara Hirofumi、Ei Shin-ichiro
    • Journal Title

      Journal of Mathematical Biology

      Volume: 84 Issue: 4 Pages: 1-26

    • DOI

      10.1007/s00285-022-01723-5

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Method of fundamental solutions for Neumann problems of the modified Helmholtz equation in disk domains2021

    • Author(s)
      Shin-Ichiro Ei, Hiroyuki Ochiai, Yoshitaro Tanaka,
    • Journal Title

      Journal of Computational and Applied Mathematics

      Volume: 402 Pages: 113795-113795

    • DOI

      10.1016/j.cam.2021.113795

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] シャドウ系に現れるフロント解の運動について2025

    • Author(s)
      栄伸一郎
    • Organizer
      北陸応用数理研究会2025
    • Related Report
      2024 Annual Research Report
    • Invited
  • [Presentation] 免疫効果を取り入れた SIR モデルとワクチン効果について2025

    • Author(s)
      栄伸一郎
    • Organizer
      城西大学数理応用セミナー ミニワークショップ 「感染症の数理」
    • Related Report
      2024 Annual Research Report
  • [Presentation] Pulse dynamics on a metric graph2024

    • Author(s)
      栄 伸一郎
    • Organizer
      研究集会「広島微分方程式研究会」
    • Related Report
      2024 Annual Research Report
    • Invited
  • [Presentation] Pulse dynamics on a star-shaped metric graph with differentwidths2024

    • Author(s)
      栄伸一郎
    • Organizer
      14th AIMS international conference
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Effective kernels for pattern formation problems2024

    • Author(s)
      栄 伸一郎
    • Organizer
      Turing Symposium on Morphogenesis
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Effective nonlocal kernels on Reaction-diffusion networks2023

    • Author(s)
      栄 伸一郎
    • Organizer
      ICIAM 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] パターン形成問題とその縮約について2023

    • Author(s)
      栄 伸一郎
    • Organizer
      日本数学会秋季総合分科会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Pulse dynamics on a metric graph2023

    • Author(s)
      栄 伸一郎
    • Organizer
      International Conference on Recent Developments of The Theory and Methods in Mathematical Biology
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Interaction of localized patterns in two dimensional spaces2023

    • Author(s)
      栄 伸一郎
    • Organizer
      RIMS Conference Multidisciplinary Research on Nonlinear Phenomena: Modeling, Analysis and Applications
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] A Billiard Problem in Nonlinear Dissipative Systems2023

    • Author(s)
      栄 伸一郎
    • Organizer
      ICIAM 2023, International Conference on Reaction-diffusion systems
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Pattern formation problems related to networks2022

    • Author(s)
      栄 伸一郎
    • Organizer
      NCTS Webinar on Nonlinear Evolutionary Dynamics (Taiwan)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] Ei-Lab

    • URL

      https://www.josai.ac.jp/~eichiro/index2.html

    • Related Report
      2024 Annual Research Report
  • [Remarks] パターン形成を数理で解明する

    • URL

      https://www2.sci.hokudai.ac.jp/faculty/researcher/shin-ichiro-ei

    • Related Report
      2022 Annual Research Report
  • [Funded Workshop] 第48回偏微分方程式論札幌シンポジウム2023

    • Related Report
      2023 Annual Research Report
  • [Funded Workshop] 第47回偏微分方程式論札幌シンポジウム2022

    • Related Report
      2022 Annual Research Report

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Published: 2022-04-19   Modified: 2026-01-16  

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