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Umezu Kenichiro  梅津 健一郎

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UMEZU Kenichiro  梅津 健一郎

UMEZU Kennichiro  梅津 健一郎

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Researcher Number 00295453
Other IDs
Affiliation (Current) 2022: 茨城大学, 教育学部, 教授
Affiliation (based on the past Project Information) *help 2015 – 2021: 茨城大学, 教育学部, 教授
2012: 茨城大学, 教育学部, 教授
2008 – 2011: Ibaraki University, 教育学部, 准教授
2007: Maebashi Institute of Technology, 工学部, 准教授
2003 – 2006: 前橋工科大学, 工学部, 助教授
1999: Maebashi Institute of Technology, Lecturer, 工学部, 講師
Review Section/Research Field
Principal Investigator
Basic analysis / Mathematical analysis / Basic Section 12020:Mathematical analysis-related
Except Principal Investigator
Basic analysis / Basic analysis
Keywords
Principal Investigator
非線形楕円型境界値問題 / 正値解 / 非線形境界条件 / 人口動態論 / 変分法 / 関数方程式 / 線形化固有値問題 / 主固有値 / 解析学 / 非線形楕円型方程式 … More / 分岐方程式 / 変分的手法 / 符号不定係数 / 分岐解析 / 正値性 / 非線形楕円型偏微分方程式 / 大域的分岐 / 符号不定な変係数 / 先験的評価 / 最大分岐成分 / 写像度の理論 / 符号変化する係数 / 凹型非線形楕円型方程式 / ネハリ多様体 / 爆発型非線形境界条件 / 大域的分岐解析 / 折り返し点 / 横断条件 / ロジスティック / 漸近挙動 / 一意性 / 安定性 / 正値解の多重性 / 人口動態 / 線形固有値問題 / 主固有値の発散 / ロバン型境界条件 / 空間1次元 / 変分的特徴付け / ノイマン境界条件 / 発散 / 必要十分条件 / 分岐パラメータ / 非線形楕円型協会値問題 / 符号不定型ロバン境界条件 / パラメータ依存 / 分岐曲線 / Nonlinear elliptic problem / Nonlinear boundary condition / Multiplicity / Bifurcation equation / Principal eigenvalue / Variational technique / Population dynamics / concave-convex型非線形性 / 非自明非負解 / 優解劣解 / concave-convex混合型非線形性 / concave型非線形性 / ループ形状連続体解集合 / concave-convex 型非線形性 / 符号不定変係数 / 分岐解 / ループ形状連続体 / 位相解析的手法 / 凹凸混合型非線形性 / 分岐正値解 / 劣線形 / ロジスティック境界条件 / 一意性と多重性 / ラプラス方程式 / 沿岸漁業収穫モデル / 非線型楕円型方程式 / 劣線形(sublinear) / ロバン境界条件 / p-Laplacian / 正値解の厳密な個数 / 多重性と一意性 / 正値解集合 / 線形化第2固有値 / 非線型関数解析 / concave非線形性 / 符号不定重み関数 / 強正値解 / sub and supersolutions / 特異的混合型非線形性 … More
Except Principal Investigator
逆問題 / 偏微分方程式 / 弾性方程式 / フェラー半群 / 関数方程式 / 複素積分 / 非線型境界値問題 / 変分法 / 散乱 / 位相的手法 / 逆関数定理 / 写像度 / 不動点定理 / 解析的半群 / 散乱波 / 弾性波動方程式 / 散乱問題 / ブラウン運動 / 境界値問題 / 人口動態論 / 化学反応論 / 調和積分論 / 積分微分作用素 / 化学反応 / 燃焼問題 / 調和積分 / 指数公式 / Brownian Motion / Boundary Value Problem / Feller Semigroup / Population Dynamics / Chemical Reactor Theory / Harmonic Integral / 波動方程式 / 散乱理論 / 双曲型方程式 / エネルギー減衰 / Rayleigh波 / 一意接続性 / elastic equations / wave equations / scattering theory / inverse problems / partial differential equations / hyperbolic equations / energy decay / Rayleigh wave / 数理生態学 / 工学 / 特異積分作用素 / 拡散過程 / マルコフ過程 / 非線形境界値問題 / Mathematical Biology / Technology / Inverse Problem / Nonlinear Boundary Value Problem / Singular Integral / Diffusion Process / Variational Method Less
  • Research Projects

    (11 results)
  • Research Products

    (78 results)
  • Co-Researchers

    (26 People)
  •  特異性を伴う混合型非線形楕円型境界値問題における非自明解集合の大域的構造の研究Principal Investigator

    • Principal Investigator
      梅津 健一郎
    • Project Period (FY)
      2018 – 2022
    • Research Category
      Grant-in-Aid for Scientific Research (C)
    • Review Section
      Basic Section 12020:Mathematical analysis-related
    • Research Institution
      Ibaraki University
  •  Study on the bifurcation structure of positive solutions for concave-convex mixed nonlinear elliptic boundary value problems with indefinite weightsPrincipal Investigator

    • Principal Investigator
      UMEZU Kenichiro
    • Project Period (FY)
      2015 – 2017
    • Research Category
      Grant-in-Aid for Scientific Research (C)
    • Research Field
      Mathematical analysis
    • Research Institution
      Ibaraki University
  •  Bifurcation analysis for nonlinear elliptic boundary value problems with combined nonlinearity of absorption and blowing up effects arising in population dynamicsPrincipal Investigator

    • Principal Investigator
      UMEZU Kenichiro
    • Project Period (FY)
      2010 – 2012
    • Research Category
      Grant-in-Aid for Scientific Research (C)
    • Research Field
      Basic analysis
    • Research Institution
      Ibaraki University
  •  Development of representation of elastic waves and investigation of their fundamental properties

    • Principal Investigator
      SOGA Hideo
    • Project Period (FY)
      2009 – 2011
    • Research Category
      Grant-in-Aid for Scientific Research (C)
    • Research Field
      Basic analysis
    • Research Institution
      Ibaraki University
  •  Mathematical Analysis for Inverse Scattering Problems of Elastic Waves

    • Principal Investigator
      SOGA Hideo
    • Project Period (FY)
      2007 – 2008
    • Research Category
      Grant-in-Aid for Scientific Research (C)
    • Research Field
      Basic analysis
    • Research Institution
      Ibaraki University
  •  Study of nonlinear boundary value problems by topological methods

    • Principal Investigator
      TAIRA Kazuaki
    • Project Period (FY)
      2007 – 2008
    • Research Category
      Grant-in-Aid for Scientific Research (C)
    • Research Field
      Basic analysis
    • Research Institution
      University of Tsukuba
  •  Study on nonlinear elliptic boundary value problems with Allee effects, arising in population dynamicsPrincipal Investigator

    • Principal Investigator
      UMEZU Kenichiro
    • Project Period (FY)
      2007 – 2009
    • Research Category
      Grant-in-Aid for Scientific Research (C)
    • Research Field
      Basic analysis
    • Research Institution
      Ibaraki University
      Maebashi Institute of Technology
  •  Inverse problems in Mathematical Biology, Chemistry and Technology

    • Principal Investigator
      TAIRA Kazuaki
    • Project Period (FY)
      2004 – 2006
    • Research Category
      Grant-in-Aid for Scientific Research (B)
    • Research Field
      Basic analysis
    • Research Institution
      University of Tsukuba
  •  Study on Positive Solutions of Nonlinear Elliptic Boundary Value Problems Arising in Population DynamicsPrincipal Investigator

    • Principal Investigator
      UMEZU Kenichiro
    • Project Period (FY)
      2004 – 2006
    • Research Category
      Grant-in-Aid for Scientific Research (C)
    • Research Field
      Basic analysis
    • Research Institution
      Maebashi Institute of Technology
  •  Analysis of fundamental properties of elastic equations

    • Principal Investigator
      SOGA Hideo
    • Project Period (FY)
      2003 – 2004
    • Research Category
      Grant-in-Aid for Scientific Research (C)
    • Research Field
      Basic analysis
    • Research Institution
      IBARAKI UNIVERSITY
  •  Brownian Motion and Nonlinear Boundary Value Problems

    • Principal Investigator
      TAIRA Kazuaki
    • Project Period (FY)
      1998 – 1999
    • Research Category
      Grant-in-Aid for Scientific Research (B)
    • Research Field
      Basic analysis
    • Research Institution
      University of Tsukuba

All 2021 2020 2019 2018 2017 2016 2015 2012 2010 2009 2008 2007 2006 2005 2004 Other

All Journal Article Presentation

  • [Journal Article] Uniqueness and positivity issues in a quasilinear indefinite problem2021

    • Author(s)
      Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu
    • Journal Title

      Calculus of Variations and Partial Differential Equations

      Volume: 60

    • DOI

      10.1007/s00526-021-02057-8

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-18K03353
  • [Journal Article] Uniqueness and sign properties of minimizers in a quasilinear indefinite problem2021

    • Author(s)
      Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu
    • Journal Title

      Communications on Pure and Applied Analysis

      Volume: 20 Pages: 2313-2322

    • DOI

      10.3934/cpaa.2021078

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-18K03353
  • [Journal Article] Nonnegative solutions of an indefinite sublinear Robin problem II: local and global exactness results2021

    • Author(s)
      Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu
    • Journal Title

      Israel Journal of Mathematics

      Volume: -

    • DOI

      10.1007/s11856-021-2278-y

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-18K03353
  • [Journal Article] Past and recent contributions to indefinite sublinear elliptic problems2020

    • Author(s)
      Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu
    • Journal Title

      Rendiconti dell'Istituto di Matematica dell'Universita di Trieste

      Volume: 52 Pages: 217-241

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-18K03353
  • [Journal Article] Nonnegative solutions of an indefinite sublinear Robin problem I: positivity, exact multiplicity, and existence of a subcontinuum2020

    • Author(s)
      Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu
    • Journal Title

      Annali di Matematica Pura ed Applicata(1923-)

      Volume: 199 Pages: 2015-2038

    • DOI

      10.1007/s10231-020-00954-x

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-18K03353
  • [Journal Article] A curve of positive solutions for an indefinite sublinear Dirichlet problem2019

    • Author(s)
      Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu
    • Journal Title

      Discrete and Continuous Dynamical Systems-A

      Volume: 40 Pages: 617-645

    • DOI

      10.3934/dcds.2020063

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-18K03353
  • [Journal Article] Loop type subcontinua of positive solutions for indefinite concave-convex problems2019

    • Author(s)
      Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu
    • Journal Title

      Advanced Nonlinear Studies

      Volume: 19 Pages: 391-412

    • DOI

      10.1515/ans-2018-2027

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-18K03353
  • [Journal Article] Positive solutions of an elliptic Neumann problem with a sublinear indefinite nonlinearity2018

    • Author(s)
      Kaufmann Uriel, Ramos Quoirin Humberto, Umezu Kenichiro
    • Journal Title

      Nonlinear Differential Equations and Applications NoDEA

      Volume: 25:12

    • DOI

      10.1007/s00030-018-0502-1

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Journal Article] A loop type component in the non-negative solutions set of an indefinite elliptic problem2018

    • Author(s)
      Ramos Quoirin Humberto, Umezu Kenichiro
    • Journal Title

      Communications on Pure and Applied Analysis

      Volume: 17 Pages: 1255-1269

    • DOI

      10.3934/cpaa.2018060

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Journal Article] Positivity results for indefinite sublinear elliptic problems via a continuity argument2017

    • Author(s)
      Kaufmann Uriel, Ramos Quoirin Humberto, Umezu Kenichiro
    • Journal Title

      Journal of Differential Equations

      Volume: 263 Pages: 4481-4502

    • DOI

      10.1016/j.jde.2017.05.021

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Journal Article] An indefinite concave-convex equation under a Neumann boundary condition II2017

    • Author(s)
      Ramos Quoirin Humberto, Umezu Kenichiro
    • Journal Title

      Topological Methods in Nonlinear Analysis

      Volume: 49 Pages: 739-756

    • DOI

      10.12775/tmna.2017.007

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Journal Article] An indefinite concave-convex equation under a Neumann boundary condition I2017

    • Author(s)
      Ramos Quoirin Humberto、Umezu Kenichiro
    • Journal Title

      Israel Journal of Mathematics

      Volume: 220 Pages: 103-160

    • DOI

      10.1007/s11856-017-1512-0

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Journal Article] On a concave-convex elliptic problem with a nonlinear boundary condition2016

    • Author(s)
      Humberto Ramos Quoirin and Kenichiro Umezu
    • Journal Title

      Annali di Matematica Pura ed Applicata

      Volume: 195 Pages: 1833-1863

    • DOI

      10.1007/s10231-015-0531-x

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Journal Article] An elliptic equation with an indefinite sublinear boundary condition2016

    • Author(s)
      Humberto Ramos Quoirin and Kenichiro Umezu
    • Journal Title

      Advances in Nonlinear Analysis

      Volume: online publishded

    • DOI

      10.1515/anona-2016-0023

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Journal Article] Positive steady states of an indefinite equation with a nonlinear boundary condition: existence, multiplicity and asymptotic profiles2016

    • Author(s)
      Humberto Ramos Quoirin and Kenichiro Umezu
    • Journal Title

      Calculus of Variations and Partial Differential Equations

      Volume: 55

    • DOI

      10.1007/s00526-016-1033-4

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Journal Article] Bifurcation for a logistic elliptic equation with nonlinear boundary conditions: A limiting case2015

    • Author(s)
      Humberto Ramos Quoirin and Kenichiro Umezu
    • Journal Title

      Journal of Mathematical Analysis and Applications

      Volume: 428 Pages: 1265-1285

    • DOI

      10.1016/j.jmaa.2015.04.005

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Journal Article] Bifurcation approach to a logistic elliptic equation with a homogeneous incoming flux boundary condition2012

    • Author(s)
      K.Umezu
    • Journal Title

      J. Differential Equations

      Volume: 252 Pages: 1146-1168

    • DOI

      10.1016/j.jde.2011.08.043

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-22540170
  • [Journal Article] Blowing-up properties of the positive principal eigenvalue for indefinite Robin-type boundary conditions2010

    • Author(s)
      K.Umezu
    • Journal Title

      Rocky Mountain J. Math.

      Volume: 40(2) Pages: 673-694

    • DOI

      10.1216/rmj-2010-40-2-673

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-22540170
  • [Journal Article] Blowing-up properties of the positive principal eigenvalue for indefinite Robin-type boundary conditions2010

    • Author(s)
      K. Umezu
    • Journal Title

      Rocky Mountain J.Math. (印刷中, 2010年出版予定)

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Journal Article] Global bifurcation results for semilinear elliptic boundary value problems with indefinite weights and nonlinear boundary conditions2010

    • Author(s)
      K. Umezu
    • Journal Title

      NoDEA (印刷中, 2010年出版予定)

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Journal Article] Global bifurcation results for semilinear elliptic boundary value problems with indefinite weights and nonlinear boundary conditions2010

    • Author(s)
      K.Umezu
    • Journal Title

      Nonlinear Differential Equations Appl. NoDEA

      Volume: 17(3) Pages: 323-336

    • DOI

      10.1007/s00030-010-0056-3

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-22540170
  • [Journal Article] Global bifurcation results for semilinear elliptic boundary value problems with indefinite weights and nonlinear boundary conditions2010

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Nonlinear Differential Equations Appl.NoDEA

      Volume: 17(3) Pages: 323-336

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-22540170
  • [Journal Article] Blowing-up properties of the positive principal eigenvalue for indefinite Robin-type boundary conditions2010

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Rocky Mountain J.Math.

      Volume: 40(2) Pages: 673-694

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-22540170
  • [Journal Article] Blowing-up properties of the positive principal eigenvalue for indefinite Robin-type boundary conditions2009

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Rocky Mountain Journal of Mathematics 40巻(印刷中)

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-19540162
  • [Journal Article] Global bifurcation results for semilinear elliptic boundary value problems with indefinite weights and nonlinear boundary conditions doi : 10.1007/s00030-010-0056-32009

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Nonlinear Differential Equations Appl.(NoDEA) (印刷中(オンラインで出版済))

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Journal Article] Blowing-up of principal eigenvalues for Neumann boundary conditions2007

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Proceedings of the Royal Society of Edinburgh 137A

      Pages: 567-579

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-19540162
  • [Journal Article] Positive solutions of semilinear elliptic eigenvalue problems with concave nonlinearities2007

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Advances in Differential Equations 12

      Pages: 1415-1436

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Journal Article] Blowing-up of principal eigenvalues for Neumann boundary conditions2007

    • Author(s)
      K. Umezu
    • Journal Title

      Proc.Roy.Soc.Edinburgh Section A 137巻

      Pages: 567-579

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Journal Article] Blowing-up of principal eigenvalues for Neumann boundary conditions2007

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Proceedings of the Royal Society of Edinburgh Section A: Mathematics 137

      Pages: 567-579

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Journal Article] Positive solutions of semilinear elliptic eigenvalue problems with concave nonlinearities2007

    • Author(s)
      K. Umezu
    • Journal Title

      Advances in Differential Equations 12巻

      Pages: 1415-1436

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Journal Article] Blowing up of principal eigenvalues for Neumann boundary conditions2007

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Proceedings of the Royal Society of Edinburgh, Section A 137巻2号

      Pages: 567-579

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-19540162
  • [Journal Article] Positive solutions of semilinear elliptic eigenvalue problems with concave nonlinearities2007

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Advances in Differential Equations 12巻12号

      Pages: 1415-1436

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-19540162
  • [Journal Article] On eigenvalue problems with Robin type boundary conditions having indefinite coefficients2006

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Applicable Analysis 8(4)

      Pages: 1313-1325

    • Data Source
      KAKENHI-PROJECT-16540165
  • [Journal Article] On eigenvalue problems with Robin type boundary conditions having indefinite coefficients2006

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Proceedings of the Royal Society of Edinburgh 85・11

      Pages: 1313-1325

    • Description
      「研究成果報告書概要(和文)」より
    • Data Source
      KAKENHI-PROJECT-16340031
  • [Journal Article] On eigenvalue problems with Robin type boundary conditions having indefinite coefficients2006

    • Author(s)
      Kenichiro UMEZU
    • Journal Title

      Proceedings of the Royal Society of Edinburgh Volume 85, Number 11

      Pages: 1313-1325

    • Description
      「研究成果報告書概要(欧文)」より
    • Data Source
      KAKENHI-PROJECT-16340031
  • [Journal Article] On eigenvalue problems with robin type boundary conditions having indefinite coefficients2006

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Applicable Analysis 85・1

      Pages: 177-186

    • Data Source
      KAKENHI-PROJECT-16340031
  • [Journal Article] On eigenvalue problems with Robin type boundary conditions having indefinite coefficients2006

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Applicable Analysis 85(11)

      Pages: 1313-1325

    • Description
      「研究成果報告書概要(和文)」より
    • Data Source
      KAKENHI-PROJECT-16540165
  • [Journal Article] One parameter-dependent nonlinear elliptic boundary value problems arising in population dynamics2005

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      in the book "Advances in analysis", World Sci.Publ

      Pages: 177-186

    • Data Source
      KAKENHI-PROJECT-16540165
  • [Journal Article] Non-existence of positive solutions for diffusive logistic equations with nonlinear boundary conditions2005

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      in the book "Progress in Nonlinear Differential Equations and Their Applications, vol.64", Birkhauser

      Pages: 497-507

    • Data Source
      KAKENHI-PROJECT-16540165
  • [Journal Article] Multiplicity of positive solutions under nonlinear boundry conditions for diffusive logistic equations2004

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Proceedings of the Edinburgh Mathematical Society 47巻2号

      Pages: 495-512

    • Data Source
      KAKENHI-PROJECT-16540165
  • [Journal Article] Multiplicity of positive solutions under nonlinear boundary conditions for diffusive logistic equations2004

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Proceedings of the Edinburgh Mathematical Society 47(2)

      Pages: 495-512

    • Description
      「研究成果報告書概要(和文)」より
    • Data Source
      KAKENHI-PROJECT-16540165
  • [Journal Article] Local bifurcation analysis and stability of steady-state solutions for diffusive logistic equations with nonlinear boundary conditions2004

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Communications in Applied Analysis 8巻4号

      Pages: 533-547

    • Data Source
      KAKENHI-PROJECT-16540165
  • [Journal Article] Local bifurcation analysis and stability of steady-state solutions for diffusive logistic equations with nonlinear boundary conditions2004

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Communications in Applied Analysis 8(4)

      Pages: 533-547

    • Description
      「研究成果報告書概要(和文)」より
    • Data Source
      KAKENHI-PROJECT-16540165
  • [Journal Article] Blowing-up of principal eigenvalues for Neumann boundary conditions

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Proceedings of the Royal Society of Edinburgh Section A : Mathematics (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Data Source
      KAKENHI-PROJECT-16540165
  • [Journal Article] Blowing-up properties of the positive principal eigenvalue for indefinite Robin-type boundary conditions

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Rocky Mountain Journal of Mathematics 印刷中

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Journal Article] Blowing-up of principal eigenvalues for Neumann boundary conditions

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Proceedings of the Royal Society of Edinburgh Section A : Mathematics (印刷中)

    • Data Source
      KAKENHI-PROJECT-16540165
  • [Journal Article] Blowing-up of principal eigenvalues for Neumann boundary conditions

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Proceedings of the Royal Society of Edinburgh Section A : Mathematics (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Data Source
      KAKENHI-PROJECT-16540165
  • [Journal Article] On eigenvalue problems with Robin type boundary conditions having indefinite coefficients

    • Author(s)
      Kenichiro Umezu
    • Journal Title

      Applicable Analysis (発表予定)(印刷中)

    • Data Source
      KAKENHI-PROJECT-16540165
  • [Presentation] Uniqueness of a positive solution for the Laplace equation with indefinite superlinear boundary conditions: near a critical case2021

    • Author(s)
      梅津健一郎
    • Organizer
      南大阪応用数学セミナー
    • Invited
    • Data Source
      KAKENHI-PROJECT-18K03353
  • [Presentation] Global exact multiplicity of positive solutions for an indenite sublinear Robin problem2020

    • Author(s)
      梅津健一郎
    • Organizer
      日本数学会2020年年会函数方程式論分科会一般講演
    • Data Source
      KAKENHI-PROJECT-18K03353
  • [Presentation] Exact multiplicity of positive solutions for an indefinite concave Robin bvp2019

    • Author(s)
      梅津健一郎
    • Organizer
      日本数学会2019年年会函数方程式論分科会
    • Data Source
      KAKENHI-PROJECT-18K03353
  • [Presentation] Existence of a loop of positive solutions for concave-convex problems with indefinite weights2019

    • Author(s)
      Kenichiro Umezu
    • Organizer
      Equadiff 2019
    • Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-18K03353
  • [Presentation] Loop components of nontrivial nonnegative solutions for indefinite concave-convex problems2018

    • Author(s)
      梅津健一郎
    • Organizer
      日本数学会2018年年会函数方程式論分科会一般講演(東大数理)
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Presentation] Positivity of bifurcating solutions of indefinite concave-convex problems2018

    • Author(s)
      Umezu Kenichiro
    • Organizer
      The 12th AIMS Conference on Dynamical Systems, Differential Equations and Applications
    • Invited / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Presentation] Positivity of bifurcating nontrivial nonnegative solutions of indefinite concave problems2018

    • Author(s)
      Kenichiro Umezu
    • Organizer
      The 12th AIMS Conference on Dynamical Systems, Differential Equations and Applications
    • Invited / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-18K03353
  • [Presentation] Positivity for nontrivial nonnegative solutions of an indefinite sublinear problem2017

    • Author(s)
      梅津健一郎
    • Organizer
      日本数学会2017年年会(函数方程式論分科会)
    • Place of Presentation
      首都大学東京
    • Year and Date
      2017-03-24
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Presentation] concave-convex タイプの非線形楕円型境界値問題に対するループ型有界連続体解集合の存在について2017

    • Author(s)
      梅津健一郎
    • Organizer
      変分問題セミナー(首都大学東京)
    • Invited
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Presentation] A loop type component of positive solutions of an indefinite concave-convex problem with the Neumann boundary condition2016

    • Author(s)
      Kenichiro Umezu
    • Organizer
      The 11th AIMS(American Institute of Mathematical Sciences)Conference
    • Place of Presentation
      Hyatt Regency Orlando, Orlando, USA
    • Year and Date
      2016-07-04
    • Invited / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Presentation] An indefinite superlinear elliptic equation with a nonlinear boundary condition of sublinear type2015

    • Author(s)
      Kenichiro Umezu
    • Organizer
      RIMS研究集会「偏微分方程式の解の形状と諸性質」
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2015-11-13
    • Invited
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Presentation] Bifurcation analysis for a logistic elliptic equation having nonlinear boundary conditions with sign-definite weights2015

    • Author(s)
      Kenichiro Umezu
    • Organizer
      Math department seminar in Universidad de Santiago de Chile
    • Place of Presentation
      Universidad de Santiago de Chile
    • Year and Date
      2015-09-01
    • Invited
    • Data Source
      KAKENHI-PROJECT-15K04945
  • [Presentation] On the effect of spatial heterogeneity in logistic type elliptic equations with nonlinear boundary conditions, The 9th AIMS Conference on Dynamical Systems2012

    • Author(s)
      K.Umezu
    • Organizer
      Differential Equations and Applications
    • Place of Presentation
      Orlando, Florida, USA
    • Year and Date
      2012-07-04
    • Data Source
      KAKENHI-PROJECT-22540170
  • [Presentation] ロジスティックタイプの非線形楕円型境界値問題に対する正値解の大域的分岐構造について2012

    • Author(s)
      梅津健一郎
    • Organizer
      首都大学東京変分問題セミナー
    • Place of Presentation
      首都大学東京
    • Year and Date
      2012-03-09
    • Data Source
      KAKENHI-PROJECT-22540170
  • [Presentation] ロジスティックタイプの非線形楕円型境界値問題に対する正値解の大域的分岐構造について2012

    • Author(s)
      梅津健一郎
    • Organizer
      変分問題セミナー
    • Place of Presentation
      首都大学東京
    • Year and Date
      2012-03-09
    • Data Source
      KAKENHI-PROJECT-22540170
  • [Presentation] Global bifurcation of positive solutions for some elliptic problems with nonlinear boundary conditions2010

    • Author(s)
      K.Umezu
    • Organizer
      洞爺解析セミナー,洞爺山水ホテル和風
    • Place of Presentation
      北海道洞爺湖温泉町
    • Year and Date
      2010-09-28
    • Data Source
      KAKENHI-PROJECT-22540170
  • [Presentation] Bifurcation analysis for indefinite weight boundary value problems with nonlinear boundary conditions, The 8th AIMS Conference on Dynamical Systems2010

    • Author(s)
      K.Umezu
    • Organizer
      Differential Equations and Applications, Dresden University of Technology
    • Place of Presentation
      Dresden, Germany
    • Year and Date
      2010-05-27
    • Data Source
      KAKENHI-PROJECT-22540170
  • [Presentation] Global bifurcation for indefinite weighted elliptic problems with nonlinear boundary conditions2010

    • Author(s)
      梅津健一郎
    • Organizer
      日本数学会2010年年会函数方程式論分科会
    • Place of Presentation
      慶應義塾大学理工学部
    • Year and Date
      2010-03-25
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Presentation] Global bifurcation analysis of indefinite nonlinear boundary value problems with nonlinear boundary conditions2010

    • Author(s)
      Kenichiro Umezu
    • Organizer
      8th AIMS Conference on Dynamical Systems, Differential Equations and Applications
    • Place of Presentation
      Dresden University ofTechnology (Dresden, Germany)
    • Year and Date
      2010-05-27
    • Data Source
      KAKENHI-PROJECT-22540170
  • [Presentation] Blowing-up properties of the positive principal eigenvalue for indefinite Robin-type boundary conditions2008

    • Author(s)
      K. Umezu
    • Organizer
      The 2^<nd> China-Japan Colloquium of Mathematical Biology
    • Place of Presentation
      岡山大学環境理工学部
    • Year and Date
      2008-08-06
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Presentation] A super and subsolution method for sublinear problems with low regularity coefficients2008

    • Author(s)
      梅津健一郎
    • Organizer
      日本数学会2008年度秋季総合分科会
    • Place of Presentation
      東京工業大学大岡山キャンパス
    • Year and Date
      2008-09-25
    • Data Source
      KAKENHI-PROJECT-19540162
  • [Presentation] A super and subsolution method for sublinear problems with low regularity coefficients2008

    • Author(s)
      梅津健一郎
    • Organizer
      日本数学会2008総合分科会函数方程式論分科会
    • Place of Presentation
      東京工業大学理工学研究科
    • Year and Date
      2008-09-25
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Presentation] A super and subsolution method for sublinear problems with low regularity coefficients2008

    • Author(s)
      梅津健一郎
    • Organizer
      日本数学会2008年秋期総合分科会函数方程式論分科会
    • Place of Presentation
      東京工業大学理工学研究科
    • Year and Date
      2008-09-25
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Presentation] Multiplicity of positive solutions to nonlinear elliptic boundary value problems arising in population dynamics2007

    • Author(s)
      K. Umezu
    • Organizer
      The workshop "Direct, Inverse and Control Problems for PDE's"
    • Place of Presentation
      Citta' Universitaria, Rome, Italy
    • Year and Date
      2007-06-27
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Presentation] Multiplicity of positive solutions to nonlinear elliptic boundary value problems arising in population dynamics2007

    • Author(s)
      梅津 健一郎
    • Organizer
      Direct, Inverse and Control Problems for PDE's
    • Place of Presentation
      ローマ大学,イタリア
    • Year and Date
      2007-06-27
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Presentation] Nehari manifold, fibering maps and semilinear elliptic boundary value problems2007

    • Author(s)
      梅津健一郎
    • Organizer
      数理科学セミナー
    • Place of Presentation
      同志社大学工学部
    • Year and Date
      2007-09-10
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Presentation] Nehari manifolds, fibering maps and semilinear elliptic boundary value problems2007

    • Author(s)
      梅津 健一郎
    • Organizer
      数理科学セミナー
    • Place of Presentation
      同志社大学工学部,京都府京田辺市
    • Year and Date
      2007-09-10
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Presentation] Principal eigenvalues of Neumann and Robin type eigenvalue problems with indefinite weights (招待講演)2007

    • Author(s)
      K. Umezu
    • Organizer
      The 4^<th> International Conference on Mathematical Biology
    • Place of Presentation
      Wuyishan, China
    • Year and Date
      2007-06-01
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Presentation] Principal eigenvalues of Neumann and Robin type eigenvalue problems with indefinite weights2007

    • Author(s)
      梅津 健一郎
    • Organizer
      The 4th International Conference on Mathematical Biology
    • Place of Presentation
      ウイシャン,中国
    • Year and Date
      2007-06-01
    • Data Source
      KAKENHI-PROJECT-19540192
  • [Presentation] On the effect of spatial heterogeneity in logistic type elliptic equations with nonlinear boundary conditions

    • Author(s)
      梅津健一郎
    • Organizer
      The 9th AIMS Conference on Dynamical Systems, Differential Equations and Applications
    • Place of Presentation
      Hyatt Grand Cypress, Orlando, USA
    • Invited
    • Data Source
      KAKENHI-PROJECT-22540170
  • 1.  SHIROTA Kenji (90302322)
    # of Collaborated Projects: 4 results
    # of Collaborated Products: 0 results
  • 2.  SOGA Hideo (40125795)
    # of Collaborated Projects: 3 results
    # of Collaborated Products: 0 results
  • 3.  KAWASHITA Mishio (80214633)
    # of Collaborated Projects: 3 results
    # of Collaborated Products: 0 results
  • 4.  TANUMA Kazumi (60217156)
    # of Collaborated Projects: 3 results
    # of Collaborated Products: 0 results
  • 5.  NOZAKI Hideaki (60208337)
    # of Collaborated Projects: 3 results
    # of Collaborated Products: 0 results
  • 6.  TAIRA Kazuaki (90016163)
    # of Collaborated Projects: 3 results
    # of Collaborated Products: 0 results
  • 7.  KINOSHITA Tamotu (90301077)
    # of Collaborated Projects: 3 results
    # of Collaborated Products: 0 results
  • 8.  YAGI Atsushi (70116119)
    # of Collaborated Projects: 3 results
    # of Collaborated Products: 0 results
  • 9.  MIYACHI Akihiko (60107696)
    # of Collaborated Projects: 3 results
    # of Collaborated Products: 0 results
  • 10.  CHIBA Yasuo (90400598)
    # of Collaborated Projects: 2 results
    # of Collaborated Products: 0 results
  • 11.  NAKAMURA Gen (50118535)
    # of Collaborated Projects: 2 results
    # of Collaborated Products: 0 results
  • 12.  KAWAMURA Kazuhiro (40204771)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 13.  KAWAMURA Kazuhiro (50036084)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 14.  TASAKI Hiroyuki (30179684)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 15.  UMEHARA Morimichi (40532164)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 16.  MINAMI Nariyuki (10183964)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 17.  SAKAMOTO Kunimochi (40243547)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 18.  KUBO Izumi (70022621)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 19.  KAIZU Satoshi (80017409)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 20.  ITO Hiroya (30211056)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 21.  WAKABAYASHI Seiichiro (10015894)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 22.  柴田 徹太郎 (90216010)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 23.  檀 和日子 (40251029)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 24.  磯崎 洋 (90111913)
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 0 results
  • 25.  RAMOS QUOIRIN Humberto
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 9 results
  • 26.  KAUFMANN Uriel
    # of Collaborated Projects: 1 results
    # of Collaborated Products: 2 results

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