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New developments in the structure of solutions to Chemotaxis systems

Research Project

Project/Area Number 19K14576
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 12020:Mathematical analysis-related
Research InstitutionTohoku University

Principal Investigator

Fujie Kentaro  東北大学, 理学研究科, 准教授 (50805398)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords走化性方程式 / Keller--Segel方程式 / 放物型方程式 / 関数方程式 / 爆発現象 / 走化性 / 移流拡散方程式 / Keller-Segel方程式 / 移流拡散 / Keller-Segel系
Outline of Research at the Start

本研究では、走化性による粘菌の挙動を記述する走化性方程式系を研究対象とする。走化性方程式系は複数の偏微分方程式の連立系として表され、単独の偏微分方程式とは異なる独特な数理構造・解の挙動をもつことが知られている。単独の偏微分方程式と連立系の数理構造の違い・共通部分を解の爆発現象に着目して解明する。解明の過程で、連立系と単独方程式の関係を明らかにする。また、連立系の独自の数理構造に主眼を置き、その一般化・高次元化である方程式系の解構造を解明する。

Outline of Final Research Achievements

The long-time behavior of the solution to the chemotaxis equation, which describes the behavior of slime molds induced by chemotaxis, is the target of this study. We studied how to estimate solutions of the chemotaxis system, which is a coupled equation, by considering it as a perturbation of a single equation. We also studied the behavior of solutions using the estimates of the second-order derivative of the energy of chemotaxis equations. Focusing on the energy structure of the equations, we research the generalization of the equations. We focused on the local sensing chemotaxis model, which has similarity with the energy structure and steady states of the chemotaxis equations, and confirmed that the research methods for the chemotaxis equations are partially applicable. We solved problems that were unsolved in the analysis of behavior of solutions of chemotaxis equations by replacing them with the chemotaxis model of local sensing.

Academic Significance and Societal Importance of the Research Achievements

本研究の対象である走化性方程式と半導体素子や中性子星に関する数理モデルとの類似性が知られており、走化性方程式はスケールの異なる様々な事象に共通する数理構造である。このことから、走化性方程式の解挙動に関する基礎研究には学術的な価値がある。
また、走性がメカニズムの中心となる生命現象は、移流項を持つ反応拡散方程式系による数理モデルで記述され、生命科学・医学を背景とした様々な数理モデルが提案されている。走化性方程式がこれらの数理モデルの基礎方程式であり、本研究の成果は生命科学・医学を背景とした数理モデルへの応用が強く期待される。このことから、本研究の実施には社会的意義がある。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (37 results)

All 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (5 results) Journal Article (8 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 8 results) Presentation (20 results) (of which Int'l Joint Research: 4 results,  Invited: 17 results) Remarks (2 results) Funded Workshop (2 results)

  • [Int'l Joint Research] Polish Academy of Sciences(ポーランド)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Chinese Academy of Sciences(中国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Chinese Academy of Sciences(中国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] IMPAN(ポーランド)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] WIPM(中国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] A short remark on comparison estimates in a chemotaxis system with local sensing2023

    • Author(s)
      Fujie Kentaro
    • Journal Title

      Discrete and Continuous Dynamical Systems - B

      Volume: - Issue: 10 Pages: 5355-5360

    • DOI

      10.3934/dcdsb.2023017

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Global boundedness of solutions to a parabolic-parabolic chemotaxis system with local sensing in higher dimensions2022

    • Author(s)
      Fujie Kentaro、Senba Takasi
    • Journal Title

      Nonlinearity

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] A note on construction of nonnegative initial data inducing unbounded solutions to some two-dimensional Keller--Segel systems2022

    • Author(s)
      Fujie Kentaro、Jiang Jie
    • Journal Title

      Mathematics in Engineering

      Volume: 4 Issue: 6 Pages: 1-12

    • DOI

      10.3934/mine.2022045

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Boundedness of Classical Solutions to a Degenerate Keller-Segel Type Model with Signal-Dependent Motilities2021

    • Author(s)
      Fujie Kentaro、Jiang Jie
    • Journal Title

      Acta Applicandae Mathematicae

      Volume: 176 Issue: 1 Pages: 36-36

    • DOI

      10.1007/s10440-021-00450-1

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Energy-Like Functional in a Quasilinear Parabolic Chemotaxis System2021

    • Author(s)
      Fujie Kentaro
    • Journal Title

      Springer INdAM Series

      Volume: 47 Pages: 67-77

    • DOI

      10.1007/978-3-030-73363-6_4

    • ISBN
      9783030733629, 9783030733636
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Comparison methods for a Keller--Segel-type model of pattern formations with density-suppressed motilities2021

    • Author(s)
      Fujie Kentarou、Jiang Jie
    • Journal Title

      Calculus of Variations and Partial Differential Equations

      Volume: 60 Issue: 3 Pages: 92-92

    • DOI

      10.1007/s00526-021-01943-5

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Global existence for a kinetic model of pattern formation with density-suppressed motilities2020

    • Author(s)
      Fujie Kentarou、Jiang Jie
    • Journal Title

      Journal of Differential Equations

      Volume: 269 Issue: 6 Pages: 5338-5378

    • DOI

      10.1016/j.jde.2020.04.001

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Some remarks on well-posedness of the higher-dimensional chemorepulsion system2019

    • Author(s)
      Cielak Tomasz、Fujie Kentarou
    • Journal Title

      Bulletin of the Polish Academy of Sciences Mathematics

      Volume: 67 Issue: 2 Pages: 165-178

    • DOI

      10.4064/ba190324-4-6

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Local sensingの走化性方程式の非有界な解について2022

    • Author(s)
      藤江 健太郎
    • Organizer
      研究集会「発展方程式における形状解析と漸近解析」
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] ある走化性方程式の少し重たい爆発解について2022

    • Author(s)
      藤江 健太郎
    • Organizer
      室蘭工大 PDE 研究会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Global boundedness in a fully parabolic chemotaxis system with local sensing in higher dimensions2022

    • Author(s)
      藤江健太郎
    • Organizer
      第39回 九州における偏微分方程式研究集会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Boundedness of solutions to a fully parabolic chemotaxis system with local sensing in higher dimensions2022

    • Author(s)
      Kentaro Fujie
    • Organizer
      第23回北東数学解析研究会
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Local sensingの走化性方程式の時間大域解について2021

    • Author(s)
      藤江健太郎
    • Organizer
      第755回 応用解析研究会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Behavior of solutions to a chemotaxis system with signal-dependent motilities2021

    • Author(s)
      藤江健太郎
    • Organizer
      研究集会「微分方程式の総合的研究」
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 2次元走化性方程式の非有界非球対称非負解の構成に関する注意2021

    • Author(s)
      藤江健太郎、Jie Jiang
    • Organizer
      第47回 発展方程式研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] Local sensingの走化性方程式の解挙動について2021

    • Author(s)
      藤江 健太郎
    • Organizer
      Critical Exponent and Nonlinear Partial Differential Equations 2021
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] ある準線型走化性方程式の大域的可解性について2021

    • Author(s)
      藤江 健太郎
    • Organizer
      日本数学会 2021年度年会 実函数論分科会 特別講演
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] On a Chemotaxis Model with Local Sensing2020

    • Author(s)
      藤江 健太郎
    • Organizer
      第17回室蘭工業大学応用解析セミナー
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Local Sensingの走化性方程式の高次元における大域的可解性について2020

    • Author(s)
      藤江 健太郎、Jie Jiang
    • Organizer
      第46回 発展方程式研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] Comparison methods for a Keller-Segel-type reaction-diffusion system2020

    • Author(s)
      藤江健太郎
    • Organizer
      第150回 熊本大学応用解析セミナー
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Comparison methods for a kinetic model of pattern formation with density-suppressed motilities2020

    • Author(s)
      藤江健太郎
    • Organizer
      OCAMI共同研究「反応拡散拡散方程式と非線形分散型方程式の解の挙動
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] New energy-like functional in fully parabolic systems of chemotaxis2019

    • Author(s)
      Fujie Kentarou
    • Organizer
      VI°Italian-Japanese Workshop GEOMETRIC PROPERTIES FOR PARABOLIC AND ELLIPTIC PDE's
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 感応性関数をもつ Keller-Segel 系の臨界条件について2019

    • Author(s)
      藤江健太郎
    • Organizer
      第50回南大阪応用数学セミナー
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Mathematical Analysis of a Kinetic Model of Pattern Formation with Density-suppressed Motilities2019

    • Author(s)
      Fujie Kentarou
    • Organizer
      RIMS合宿型セミナー「Pattern formation and defects in biology and materials science」
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On a chemotaxis system with sensitivity functions2019

    • Author(s)
      Fujie Kentarou
    • Organizer
      RIMS共同研究 「発展方程式論の新展開:数理理論と現象解析の協働
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On a kinetic model with density-suppressed motility for pattern formations2019

    • Author(s)
      藤江健太郎
    • Organizer
      九州工業大学・数理セミナー
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Comparison Methods for a Kinetic Model of Pattern Formation with Density-suppressed Motilities2019

    • Author(s)
      藤江健太郎
    • Organizer
      第45回 発展方程式研究会
    • Related Report
      2019 Research-status Report
  • [Presentation] Comparison methods for a Keller-Segel-type reaction-diffusion system2019

    • Author(s)
      藤江健太郎
    • Organizer
      第13回実解析と函数解析による偏微分方程式論
    • Related Report
      2019 Research-status Report
    • Invited
  • [Remarks] Kentaro FUJIE web

    • URL

      http://www.math.tohoku.ac.jp/~fujie/research.html

    • Related Report
      2022 Annual Research Report
  • [Remarks] 藤江 健太郎 (Kentaro Fujie) - マイポータル - researchmap

    • URL

      https://researchmap.jp/kfujie/

    • Related Report
      2021 Research-status Report 2020 Research-status Report 2019 Research-status Report
  • [Funded Workshop] Online Seminar on Chemotaxis2022

    • Related Report
      2022 Annual Research Report
  • [Funded Workshop] One-day Online Workshop on Chemotaxis2021

    • Related Report
      2021 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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