講演・口頭発表等（researchmap）

Talks in international conferences or invited talks †

  1. 2024-06-13 Positive solutions for logistic type elliptic equation with a non Lipschitz boundary condition arising in coastal fishery harvesting, Equadiff 2024 (Karlstad University, Sweden, June 10-14, 2024). slides
  2. 2023-06-01 An exact multiplicity result for some sublinear Robin problem with an indefinite weight (with UK and HRQ), in the special session (SS3) of The 13th AIMS Conference on Dynamical Systems, Differential Equations and Applications (University of North Carolina Wilmington, Wilmington, USA, May 31-June 4, 2023). slides
  3. 2019-07-11, Existence of a loop of positive solutions for concave-convex problems with indefinite weights (with UK and HRQ), Equadiff 2019 (Leiden University, Leiden, The Netherlands, July 8-12 2019). the poster slides
  4. 2018-07-06, Positivity of bifurcating nontrivial nonnegative solutions of indefinite concave problems (with Uriel Kaufmann and HRQ), IN the Special Session `Nonlinear Elliptic and Parabolic Problems (SS17)', organized by Prof. Sze-Bi Hsu and Prof. Julian Lopez-Gomez, The 12th AIMS Conference on Dynamical Systems, Differential Equations and Applications (National Taiwan University, Taipei, Taiwan, July 5-9, 2018). slides
  5. 2016-10-08, On the existence of a loop component of nontrivial non-negative solutions for some concave-convex problem (with HRQ), Workshop on reaction diffusion equations and numerical analysis (Kyoto Sangyo University, Kyoto, October 8, 2016). slides
  6. 2016-07-04, A loop type component of positive solutions of an indefinite concave-convex problem with the Neumann boundary condition(with Humberto Ramos Quoirin), IN the Special Session SS36 `New Trends in Nonlinear Partial Differential Equations and Applications' organized by Prof. J.L\'opez-G\'omez, The 11th AIMS Conference on Dynamical Systems, Differential Equations and Applications (Orlando, Florida, USA, July 1-5, 2016). slides
  7. 2015-11-13, An indefinite superlinear elliptic equation with a nonlinear boundary condition of sublinear type (with Humberto Ramos Quoirin), RIMS Workshop `Shapes and other properties of solutions of PDEs' (RIMS, Kyoto University, November 11-13, 2015). slides
  8. 2015-09-01, Bifurcation analysis for a logistic elliptic equation having nonlinear boundary conditions with sign-definite weights, IN the Math Department Seminar of Universidad de Santiago de Chile. slides
  9. 2014-07-08, The effect of a nonlinear boundary condition with an indefinite weight on the positive solution set of the logistic elliptic equation (with Humberto Ramos Quoirin), IN the special session Nonlinear Elliptic and Parabolic Problems (SS18) organized by Prof. L\'opez-G\'omez in The 10th AIMS Conference on Dynamical Systems, Differential Equations and Applications (Madrid, Spain, July 7-11, 2014). slides
  10. 2012-07-04, On the effect of spatial heterogeneity in logistic type elliptic equations with nonlinear boundary conditions, The Special Session SS55 Nonlinear Elliptic and Parabolic Problems organized by Prof. L\'opez-G\'omez in The 9th AIMS Conference on Dynamical Systems, Differential Equations and Applications (Orlando, Florida, USA, July 1-5, 2012). slides
  11. 2010-05-27, Global bifurcation analysis of indefinite nonlinear boundary value problems with nonlinear boundary conditions, IN The 8th AIMS Conference on Dynamical Systems, Differential Equations and Applications (Dresden University of Technology, Dresden, Germany, May 25-28, 2010). abstract slides
  12. 2008-08-06, Blowing-up properties of the positive principal eigenvalue for indefinite Robin-type boundary conditions, IN The Second China-Japan Colloquium of Mathematical Biology (Okayama University, August 4-7, 2008). slides
  13. 2007-06-27, Multiplicity of positive solutions to nonlinear elliptic boundary value problems arising in population dynamics, IN Workshop "Direct, Inverse And Control Problems For PDE's" (Rome, Italy, June 25-28, 2007).
  14. 2007-06-01, Principal eigenvalues of Neumann and Robin type eigenvalue problems with indefinite weights, IN The 4th International Conference on Mathematical Biology (Wuyishan, Fujian, P.R. China, May 29 - June 1, 2007).
  15. 2006-04-25, Blowing-up behavior of principal eigenvalues for Neumann boundary conditions, IN The first China-Japan Colloquium of Mathematical Biology (CJCMB) (Southwest University, Chongqing, China, 24-28 April 2006). slides
  16. Jul. 2005, Elliptic eigenvalue problems with indefinite Robin boundary conditions, the 5th Congress, ISAAC2005 (University of Catania, Italy, 25-30 July 2005).
  17. Jun. 2004, Existence and nonexistence of positive solutions for a semilinear elliptic problem arising in population dynamics, Nonlinear Elliptic and Parabolic Problems: A Special Tribute to the Work of Herbert Amann (University of Zurich, Zurich, 28-30 June 2004).
  18. Aug. 2003, On diffusive logistic equations having nonlinear boundary conditions, the 4th Congress, ISAAC2003 (York University, Toronto, 11-16 August 2003).
  19. Sep. 2002, Bifurcation problem for a semilinear elliptic equation arising in population dynamics, having nonlinear boundary conditions, International Conference on Nonlinear Partial Differential Equations Theory and Approximation (City University of Hong Kong, Hong Kong, 29 August - 2 September 2002).
  20. Sep. 2001, Bifurcation in population dynamics, The 4th European Conference on Elliptic and Parabolic Problems (Gaeta, Italy, 24-28 September 2001).
  21. Aug. 2001, Bifurcation analysis in diffusive logistic equations with nonlinear boundary conditions), the 3rd Congress, ISAAC2001 (Freie University, Berlin, 20-25 August 2001).
  22. Aug. 1999, Bifurcation and stability for diffusive logistic equations with nonlinear boundary conditions, International Conference on Nonlinear Partial Differential Equations1999 (Lviv State University, Ukraine, 24-28 August 1999).
  23. Jul. 1999, Elliptic boundary value problems with nonlinear boundary conditions, the 4th Congress, ICIAM1999 (University of Edinburgh, Scotland, 5-9 July 1999).
  24. Jun. 1997, Semilinear elliptic boundary value problems in chemical reactor theory, RIMS Workshop `Variational problems and related topics' (RIMS, Kyoto Univ.)．
  25. Jun. 1997, Semilinear elliptic boundary value problems in chemical reactor theory, the 1st Congress, iSAAC1997 (University of Delaware, USA, 3-6 June 1997).
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General talks in Mathematical Society Meetings of Japan †

  1. 2025-03-18 Positive solutions of a diffusive logistic equation with a non Lipschitz boundary condition arising in coastal fishery harvesting, 2025年年会函数方程式論分科会（早稲田大学）．スライド
  2. 2020-03-16 Global exact multiplicity of positive solutions for an indenite sublinear Robin problem, 2020年年会函数方程式論分科会（日大理工）．
  3. 2019-03-17 Exact multiplicity of positive solutions for an indefinite concave Robin bvp, 2019年年会函数方程式論分科会（東工大）．スライド
  4. 2018-03-18 Loop components of nontrivial nonnegative solutions for indefinite concave-convex problems, 2018年年会函数方程式論分科会（東大数理）．スライド
  5. 2017-03-24 Positivity for nontrivial nonnegative solutions of an indefinite sublinear problem, 2017年年会函数方程式論分科会（首都大学東京）．スライド
  6. 2015-03-21 convex-concave 混合型境界値問題の解構造における不定符号係数の役割について， 2015年年会函数方程式論分科会（明治大学総合数理学部）．スライド
  7. 2014-03-17 On S-shaped and CS-shaped bifurcation diagrams in population dynamics, 2014年年会函数方程式論分科会 （学習院大学理学部）．スライド
  8. 2010-03-25 Global bifurcation for indefinite weighted elliptic problems with nonlinear boundary conditions, 2010年年会函数方程式論分科会 （慶應義塾大学理工学部）．スライド
  9. 2008-09-25 A super and subsolution method for sublinear problems with low regularity coefficients, 日本数学会'08総合分科会函数方程式論分科会 （東京工業大学理工学研究科）．スライド
  10. 2007-03-28, 主固有値の爆発と人口動態， 日本数学会'07年会函数方程式論分科会（埼玉大学理学部）．スライド
  11. Mar. 2006, 符号不定な重み係数をもつロバン型境界条件に対する 主固有値の特徴付け, 日本数学会'06年会函数方程式論分科会(中央大学理工学部).
  12. Mar. 2005, An estimate for turning points in sublinear elliptic boundary value problems, 日本数学会'05年会函数方程式論分科会（日本大学理工学部）．
  13. Sep. 2003, Existence and limiting behavior of positive solutions for diffusive logistic equations with nonlinear flux on the boundary, 日本数学会'03総合分科会函数方程式論分科会（千葉大学理学部）.
  14. Mar. 2002, Global subcontinua arising in population dynamics, 日本数学会'02年会函数方程式論分科会（明治大学理工学部）．
  15. Mar. 2001, Bifurcation in Population Genetics, 日本数学会'01年会函数方程式論分科会（慶應義塾大学理工学部）．
  16. Mar. 2000, Bifurcation from infinity and uniqueness of positive solutions to semilinear elliptic equations with nonlinear boundary conditions, 日本数学会'00年会函数方程式論分科会（早稲田大学理工学部）．
  17. 30 Mar. 2000, 非線形境界条件における人口動態モデルの正値解の挙動， 日本数学会'00年会函数方程式論分科会（早稲田大学理工学部）．
  18. Mar. 1999, 化学反応論における漸近安定性, 日本数学会'99春年会函数方程式論分科会（学習院大学理学部）．
  19. Oct. 1998, Positive solutions of semilinear elliptic boundary value problems, 日本数学会'98秋季函数方程式論分科会（大阪大学理学研究科）．
  20. Mar. 1998, 化学反応論における安定性, 日本数学会'98年会函数方程式論分科会（名城大学理学部）．
  21. Apr. 1997, 化学反応論における半線型楕円型境界値問題, 日本数学会'97年会函数方程式論分科会（信州大学理学部）．
  22. Apr. 1996, 半線形楕円型境界値問題の正値解の一意存在定理, 日本数学会'96年会函数方程式論分科会（新潟大学理学部）．
  23. Sep. 1995, 非線形楕円型境界値問題の正値解の一意存在定理, 日本数学会'95秋季函数方程式論分科会（東北大学理学部）．
  24. Mar. 1995, 非線形楕円型境界値問題の解の分岐定理, 日本数学会'95年会函数方程式論分科会（立命館大学理工学部）．
  25. Sep. 1993, ２階楕円型作用素に対する混合型境界値問題の $L^p$ アプローチ, 日本数学会'93秋季函数方程式論分科会（大阪府立大学総合科学部）．
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Others †

  1. 2023-07-07, Positive solutions for some sublinear Robin problem with an indefinite weight, 茨城大学金曜セミナー（茨城大学理学部）．スライド
  2. 2022-06-09, Logistic elliptic equations with the nonlinear boundary condition arising in coast fishery harvesting, 東北大学応用数理解析セミナー（東北大学理学研究科）.
  3. 2021-12-11, Uniqueness of a positive solution for the Laplace equation with indefinite superlinear boundary conditions: near a critical case, 南大阪応用数学セミナー（大阪市立大学，大阪府立大学）. スライド
  4. 2017-12-14, 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，変分問題セミナー（首都大学東京）．
  5. 2012-03-09, 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，変分問題セミナー（首都大学東京）． 講演要旨 講演スライド
  6. 2010-09-28, Global bifurcation of positive solutions for some elliptic problems with nonlinear boundary conditions, 洞爺解析セミナー（洞爺山水ホテル和風，北海道洞爺湖温泉町）．講演スライド
  7. 2007-09-10， Nehari manifolds, fibering maps and semilinear elliptic boundary value problems, 数理科学セミナー（同志社大学工学部）．
  8. 2006-12-20, Blowing-up principal eigenvalues of Neumann eigenvalue problems with indefinite weights, 解析セミナー（筑波大学数学系）．
  9. 2006-12-02, ノイマン条件下における主固有値の爆発問題，応用解析研究会（早稲田大学理工学部）．
  10. 2006-09-10, ノイマン条件のもとでの主固有値の爆発問題，数理科学セミナー（茨城大学教育学部）．
  11. 2004-07-18, Stationary solutions of diffusive logistic equations with large diffusion and nonlinear boundary conditions, 数理科学セミナー (茨城大学教育学部）．
  12. 2003-09-04, 人口動態論に現れる非線形楕円型方程式の正値解の多重性と挙動，筑波大学数学系談話会（筑波大学数学系）
  13. 2003-02-14, Multiplicity of positive solutions to a nonlinear elliptic boundary value problem arising in population dynamics, 都立大変分問題セミナー（東京都立大学理学部）．
  14. 2002-11-08, Bifurcation analysis of a semilinear elliptic problem arising in population dynamics and having nonlinear boundary conditions, 自己相互作用粒子系の数学解析と数理（大阪大学基礎工学部）．
  15. 2002-06-08, Local and global bifurcation analysis on a nonlinear problem from population, 数理科学セミナー（茨城大学教育学部）．
  16. 2001-05-23, Bifurcation on nonlinear eigenvalue problems in population dynamics, 解析セミナー（筑波大学数学系）．
  17. 2000-09-09, 人口動態モデルに現れる分岐現象, 生物現象と非線形微分方程式（広島大学理学研究科）．
  18. 2000-05-12, Diffusive logistic equations with indefinite weights and nonlinear boundary conditions, 数理科学セミナー（茨城大学教育学部）．
  19. 1999-11-12, 非線形境界条件に対する人口動態モデルの正値解の挙動， 生物現象と非線形微分方程式（広島大学理学研究科）．
  20. Jun. 1999, Diffusive logistic equations with nonlinear boundary conditions, 数理科学セミナー（茨城大学教育学部）．
  21. Jan. 1999, 酵素反応に現われる非線型楕円型境界値問題, 解析セミナー（筑波大学数学系）．
  22. Sep. 1998, 発酵作用に現われる非線型楕円型境界値問題, 生物現象と非線形微分方程式（広島大学理学部）．
  23. Jul. 1998, Positive solutions of semilinear elliptic boundary value problems, 偏微分方程式長野シンポジウム（いこいの村アゼィリア飯綱）．
  24. Oct. 1997, 半線型楕円型境界値問題とその応用, 偏微分セミナー（東京都立大学理学部）．
  25. Dec. 1996, 化学反応論における半線型楕円型境界値問題, 応用解析研究会（早稲田大学理工学部）．
  26. Nov. 1996, Fourier multipliers in weighted $L^p$ spaces, 実解析シンポジウム'96大分応用解析研究会（大分大学教育学部）．
  27. Dec. 1995, 非線形楕円型境界値問題の正値解の一意存在定理, 微分方程式研究会（早稲田大学理工学部）．
  28. Sep. 1995, Positive solutions of semilinear elliptic boundary value problems, 偏微分方程式賢島シンポジウム（大阪商工会議所賢島研修センター）．
  29. Jan. 1994, order が変化する Besov 空間について，函数空間論とその応用（筑波大学数学系）．


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