Oka Hirokazu 岡裕和

… Alternative Names

岡裕和オカヒロカズ

OKA Hirokazu 岡裕和

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Researcher Number	90257254
Other IDs
Affiliation (Current)	2025: 茨城大学, 応用理工学野, 教授
Affiliation (based on the past Project Information) *help	2018: 茨城大学, 理工学研究科(工学野), 教授 2016 – 2017: 茨城大学, 工学部, 教授 2008 – 2014: Ibaraki University, 工学部, 教授 2007: Ibaraki University, College of Engineering, Associate Professor 2004 – 2006: 茨城大学, 工学部, 助教授 … More 2002 – 2003: 茨城大学, 工学部, 講師 1998 – 1999: 茨城大学, 工学部, 講師 1993: 早稲田大学, 教育学部, 助手 Less
Review Section/Research Field	Principal Investigator Basic analysis / Basic analysis Except Principal Investigator Basic analysis / 解析学
Keywords	Principal Investigator 半閉作用素 / 半線形発展方程式 / Bergman空間 / 軟解 / Hardy空間 / ベルグマン空間 / 荷重合成作用素 / 解析関数空間 / リプシッツ作用素半群 / 準線形双曲型方程式 … More / 抽象的コーシー問題 / 作用素半群 / ヴォルテラ方程式 / 双曲型発展方程式 / 積分微分方程式 / nonlinear hyperbolic systems / dissiiativity condition / mild solutions / Cauchy problems / semierouos of locally Lipschitz operators / semilinear evolution equations / stability condition / finite difference approximations / 作用素平均 / 古田不等式 / Chernoffの積公式 / 非稠密な定義域をもつ作用素 / Stieltjes完全性 / conelike半群 / 作用素不等式 / 退化準線形双曲型方程式 / 準線形発展方程式 / 作用素幾何平均 / Bebiano-Lemos-Providencia不等式 / Grand Furuta不等式 / Hyers-Ulam-Rassias安定性 / 非線形双曲系 / 消散条件 / コーシー問題 / 局所リプシッツ作用素半群 / 安定性条件 / 有限差分近似 / べきコンパクト / 荷重付き合成作用素 / ボルテラ方程式 / 移流拡散方程式系 / 発展方程式 / DeBranges 空間 / Favard class / 合成作用素 / Volterra型積分作用素 / Fock型空間 / DeBranges空間 / quasilinear equation / Hyers-Ulam安定性 / Cauchy-Euler型作用素 / Bargmann-Fock空間 / integral solution / Bergman型空間 / チェザロ型積分作用素 / Fock型関数空間 / 積分型作用素 / 単位的半単純可換Banach環 / ソボレフ空間 / 積分作用素 / 有界正則関数空間 / q-距離 / ベルグマン・オーリッツ空間 / Bloch空間 / q-変形正規作用素 / 実解析 … More Except Principal Investigator 関数解析学 / リプシッツ空間 / ツリー / 荷重合成作用素 / 樹形グラフ / 積分作用素 / 複素解析学 / 解析関数空間 / 荷重付き合成作用素 / 合成作用素 / カラテオドリ条件 / 準線型発展方程式 / 強解 / 準線形発展方程式 / DeBranges空間 / 半閉作用素 / 発展方程式 / 抽象的コーシー問題 / integrated semigroup / Hille-吉田の定理 / 線形作用素の半群 Less

Study on topological structure and algebraic structure of multiplication and composition of analytic functions
- Principal Investigator
  
  Hosokawa Takuya
- Project Period (FY)
  2016 – 2018
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Basic analysis
- Research Institution
  Ibaraki University
Study on the well-posedness of hyperbolic equation with memoryPrincipal Investigator
- Principal Investigator
  
  OKA Hirokazu
- Project Period (FY)
  2012 – 2014
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Basic analysis
- Research Institution
  Ibaraki University
Topological structures for semiclosed operators using de Branges space theory
- Principal Investigator
  
  HIRASAWA GO
- Project Period (FY)
  2012 – 2014
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Basic analysis
- Research Institution
  Ibaraki University
Functional analytic research of hyperbolic equations with memoryPrincipal Investigator
- Principal Investigator
  
  OKA Hirokazu
- Project Period (FY)
  2008 – 2011
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Basic analysis
- Research Institution
  Ibaraki University
Studies of solvability for hyperbolic Volterra equationsPrincipal Investigator
- Principal Investigator
  
  OKA Hirokazu
- Project Period (FY)
  2005 – 2007
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Basic analysis
- Research Institution
  Ibaraki University
抽象的双曲型ヴォルテラ方程式の理論とその応用Principal Investigator
- Principal Investigator
  
  岡裕和
- Project Period (FY)
  2002 – 2004
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Basic analysis
- Research Institution
  Ibaraki University
抽象的双曲型ヴォルテラ方程式の理論と応用Principal Investigator
- Principal Investigator
  
  岡裕和
- Project Period (FY)
  1998 – 1999
- Research Category
  
  Grant-in-Aid for Encouragement of Young Scientists (A)
- Research Field
  
  Basic analysis
- Research Institution
  Ibaraki University
発展方程式の理論とその応用
- Principal Investigator
  
  宮寺功
- Project Period (FY)
  1993
- Research Category
  
  Grant-in-Aid for General Scientific Research (C)
- Research Field
  
  解析学
- Research Institution
  Waseda University

All 2019 2017 2015 2014 2012 2010 2009 2005 Other

All Journal Article Presentation

[Journal Article] Characterization of distributive semigroup operations on the positive real numbers2019
- Author(s)
  Takahasi Sin-Ei、Miura Takeshi、Oka Hirokazu
- Journal Title
  
  Semigroup Forum
  
  Volume: online Issue: 2 Pages: 1-20
- DOI
  10.1007/s00233-019-10006-3
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16K05190, KAKENHI-PROJECT-20K03650
[Journal Article] Semigroup operations distributed by the ordinary multiplication or addition on the real numbers2017
- Author(s)
  Sin-Ei Takahasi, Hiroyuki Takagi, Takeshi Miura and Hirokazu Oka
- Journal Title
  
  Publ Math. Debrecen
  
  Volume: 91 Issue: 3-4 Pages: 297-307
- DOI
  10.5486/pmd.2017.7560
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-15K04921, KAKENHI-PROJECT-16K05190
[Journal Article] Weighted composition operators between Hilbert spaces of analytic functions in the operator norm and Hilbert-Schmidt norm topologies2015
- Author(s)
  T. Hosokawa, K. Izuchi, S. Ohno
- Journal Title
  
  J. Math. Anal. Appl.
  
  Volume: 421 Issue: 2 Pages: 1546-1558
- DOI
  10.1016/j.jmaa.2014.07.043
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-24540158, KAKENHI-PROJECT-24540190, KAKENHI-PROJECT-25800055
[Journal Article] Some remarks on operator equation C_φ=C_ψ X2014
- Author(s)
  T. Hosokawa and M. Seto
- Journal Title
  
  Nihonkai Math. J.
  
  Volume: 25 Pages: 85-91
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-24540158
[Journal Article] Differences of weighted composition operators from H∞ to Bloch space,2012
- Author(s)
  T.Hosokawa, S.Ohno
- Journal Title
  
  Taiwanese Journal of Mathematics
  
  Volume: 16 Pages: 2093-2105
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-24540158
[Journal Article] Global solvability for abstract semilinear evolution equations2010
- Author(s)
  岡裕和, 田中直樹
- Journal Title
  
  Math. Nachr.
  
  Volume: 283 Pages: 1171-1193
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20540154
[Journal Article] Global solvability for abstract semilinear evolution equations2010
- Author(s)
  Hirokazu Oka
- Journal Title
  
  Math.Nachr.
  
  Volume: 283 Pages: 1171-1193
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20540154
[Journal Article] Global solvability for abstract semilinear evolution equations2010
- Author(s)
  岡裕和、田中直樹
- Journal Title
  
  Math.Nachr. 283巻
  
  Pages: 1171-1193
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20540154
[Journal Article] The essential norm of a weighted composition operator from the Bloch space to H^∞2009
- Author(s)
  Takuya Hosokawa
- Journal Title
  
  Bulletin of the Australian Mathematical Society 79
  
  Pages: 487-497
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20540154
[Journal Article] Evolution operators generated by non-densely defined operators.2005
- Author(s)
  Hirokazu Oka
- Journal Title
  
  Math.Nachr. 278・11
  
  Pages: 1285-1296
- Data Source
  KAKENHI-PROJECT-17540143
[Journal Article] Evolution operators generated by non-densely defined operators2005
- Author(s)
  Hirokazu Oka
- Journal Title
  
  Math. Nachr. 278
  
  Pages: 1285-1296
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-17540143
[Journal Article] Evolution operators generated by non-densely defined operators2005
- Author(s)
  Hirokazu, Oka
- Journal Title
  
  Math. Nachr. 278
- Description
  「研究成果報告書概要(和文)」より
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17540143
[Journal Article] Global solvability of abstract semilinear evolution equations
- Author(s)
  Hirokazu, Oka
- Journal Title
  
  Math. Nachr. (In press)
- Description
  「研究成果報告書概要(和文)」より
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17540143
[Journal Article] Linear Combinations of Composition Operators on the Bloch spaces
- Author(s)
  Takuya Hosokawa
- Journal Title
  
  Canadian Mathematical Society (未定, 掲載決定)
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20540154
[Journal Article] Eigenvalues of weighted composition operators on the Bloch space
- Author(s)
  Takuya Hosokawa
- Journal Title
  
  Integral Equation and Operator Theory (未定, 掲載決定)
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20540154
[Journal Article] Global solvability of abstract semilinear evolution equations
- Author(s)
  Hirokazu Oka
- Journal Title
  
  Math.Nachr. (in press)
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-17540143
[Journal Article] Differences of weighted composition operators acting from Bloch space to H^∞
- Author(s)
  Takuya Hosokawa
- Journal Title
  
  Transactions of the American Mathematical Society (未定, 掲載決定)
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20540154
[Journal Article] Evolution operators generated by non-densely defined operators
- Author(s)
  Hirokazu Oka, Naoki Tanaka
- Journal Title
  
  Mathematische Nachrichten (掲載決定)
- Data Source
  KAKENHI-PROJECT-14740097
[Presentation] Composition operators induced by products of analytic self-maps2019
- Author(s)
  Takuya Hosokawa and Shuichi Ohno
- Organizer
  AMS Sectional Meeting AMS Special Session
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16K05190

1. HIRASAWA Go (10434002)

# of Collaborated Projects: 4 results

# of Collaborated Products: 0 results
2. HOSOKAWA Takuya (90553579)

# of Collaborated Projects: 3 results

# of Collaborated Products: 8 results
3. TANAKA Naoki (00207119)

# of Collaborated Projects: 3 results

# of Collaborated Products: 2 results
4. UEKI Seiichirou (70512408)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
5. NAKAMOTO Ritsuo (80007799)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
6. NISHIO Katsuyoshi (40001698)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
7. SAKAKIBARA Nobuhisa (30235139)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
8. 宮寺功 (50063293)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
9. 伊藤隆一 (00063769)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
10. 鈴木晋一 (10030777)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
11. 石垣春夫 (60063492)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
12. 和田淳蔵 (50063342)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
13. 大野修一 (20265367)

# of Collaborated Projects: 1 results

# of Collaborated Products: 1 results
14. 瀬戸道生 (30398953)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
15. 阿部敏一 (40749157)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
16. 三浦毅

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results

Oka Hirokazu 岡 裕和

岡 裕和 オカ ヒロカズ

OKA Hirokazu 岡 裕和

Research Projects

Research Products

Co-Researchers

Study on topological structure and algebraic structure of multiplication and composition of analytic functions

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Study on the well-posedness of hyperbolic equation with memoryPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Topological structures for semiclosed operators using de Branges space theory

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Functional analytic research of hyperbolic equations with memoryPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Studies of solvability for hyperbolic Volterra equationsPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

抽象的双曲型ヴォルテラ方程式の理論とその応用Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

抽象的双曲型ヴォルテラ方程式の理論と応用Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

発展方程式の理論とその応用

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

[Journal Article] Characterization of distributive semigroup operations on the positive real numbers2019

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Semigroup operations distributed by the ordinary multiplication or addition on the real numbers2017

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Weighted composition operators between Hilbert spaces of analytic functions in the operator norm and Hilbert-Schmidt norm topologies2015

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Some remarks on operator equation C_φ=C_ψ X2014

Author(s)

Journal Title

Data Source

[Journal Article] Differences of weighted composition operators from H∞ to Bloch space,2012

Author(s)

Journal Title

Data Source

[Journal Article] Global solvability for abstract semilinear evolution equations2010

Author(s)

Journal Title

Oka Hirokazu 岡裕和

岡裕和オカヒロカズ

OKA Hirokazu 岡裕和