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Morikuni Keiichi

Affiliation
Faculty of Engineering, Information and Systems
Official title
Assistant Professor
Research fields
Mathematical informatics
Computational science
Foundations of mathematics/Applied mathematics
Research keywords
Numerical Computation
Numerical Analysis
Numerical Linear Algebra
Research projects
Development of complex moment-based methods and mathematical risk avoidance techniques for infinite dimensional eigenvalue probl2021-04 -- (current)Imakura, A.Japan Society of for the Promotion of Science/Grant-in-Aid for Scientific Research (B)17,030,000Yen
Robust and Efficient Numerical Methods for Matrix Problems with Singularity2020-04 -- (current)Keiichi MorikuniJapan Society of for the Promotion of Science/Grant-in-Aid for Early-Career Scientists4,290,000Yen
非線形変数変換を用いた積分型固有値解法による固有値解析技術の開発2018-04 -- (current)Sakurai, T.Japan Society of for the Promotion of Science/Grant-in-Aid for Scientific Research(B)16,770,000Yen
Convergence Analysis of Krylov Subspace Methods for Singular Systems in Finite Precision Arithmetic2018-10 -- 2018-10Morikuni, K.University of Tsukuba/Short-Term Overseas Travel Grant Program in 2018400,000Yen
精度保証および耐障害技術に基づく周回積分型固有値解法のリスク回避2018-07 -- 2019-03今倉 暁筑波大学/システム情報系若手融合研究プロジェクト500,000Yen
Contour integral-type anti-perturbation eigensolvers for rectangular matrix pencils2017-08 -- 2018-07Morikuni, K.The Hattori Hokokai Foundation, Public Interest Incorporated Foundation/Grant-in-Aid for Engineering Research1,000,000Yen
精度保証および耐障害技術に基づく周回積分型固有値解法のリスク回避2017-07 -- 2018-03Imakura, A.筑波大学/システム情報系若手融合研究プロジェクト500,000Yen
精度保証および耐障害技術に基づく周回積分型固有値解法のリスク回避2016-07 -- 2017-03Imakura, A.筑波大学/システム情報系若手融合研究プロジェクト300,000Yen
Robust and efficient solutions of large sparse constrained eigenvalue problems2016-04 -- 2021-03Morikuni, K.Japan Society of for the Promotion of Science/Grant-in-Aid for Scientific Research4,030,000Yen
Design and analysis of solution methods for large-scale least squares problems2010-06 -- 2010-07Morikuni, K.The Graduate University for Advanced Studies/Sokendai Short-stay Study Abroad Program 2010400,000Yen
Career history
2015-06 -- (current)University of Tsukuba Division of Information Engineering, Faculty of Engineering, Information and Systems Assistant Professor
2014-04 -- 2015-05Czech Academy of Sciences Institute of Computer Science Postdoctoral Fellow (Czech Academy of Sciences Program of PostDoc Support)
2013-04 -- 2014-03National Institute of Informatics Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) "Development of the Fastest Database Engine for the Era of Very Large Database and Experiment and Evaluation of Stra Project researcher, Uno Laboratory
2008-05 -- 2013-02National Institute of Informatics Hayami Laboratory Research assistant
Academic background
2008-04 -- 2013-03The Graduate University for Advanced Studies (SOKENDAI) School of Multidisciplinary Sciences Department of Informatics (Five-year Doctoral Program)Completed
2004-04 -- 2008-03Kyushu University School of Design Department of Acoustic DesignGraduated
Degree
2013-03Doctor of PhilosophyThe Graduate University for Advanced Studies
2008-03Bachelor of DesignKyushu University
Academic societies
2013 -- (current)ILAS (International Linear Algebra Society)
2012 -- (current)SIAM (Society for Industrial and Applied Mathematics)
2008 -- (current)The Japan Society for Industrial and Applied Mathematics (JSIAM)
2014 -- 2014Information Processing Society of Japan
2008 -- 2013Acoustical Society of Japan
Honors & Awards
2018-09Best Poster Award at the 2018 JSIAM Annual Meetingスペクトラル特徴量スケーリングの多クラス分類問題への拡張
2017-09Best poster award at the 2017 JSIAM Annual Meeting複素モーメントの誤差評価を用いた周回積分型精度保証付き部分固有値計算 (Contour integral-type verified partial eigenvalue computation via errors of complex moments)
2017-06Best Presentation Award for Young Researchers at the 2016 JSIAM Annual Meeting長方行列束の固有値問題に対する周回積分型解法 (Contour integral-type method for eigenproblems of rectangular matrix pencils)
2015-02Inoue Research Award for Young ScientistsInner-iteration preconditioning for least squares problems
2013-07SIAM Student Paper PrizeInner-Iteration Krylov Subspace Methods for Least Squares Problems, SIAM J. Matrix Anal. Appl., 34 (2013), pp. 1-22"
2013-03The Graduate University for Advanced Studies Nagakura Research Incentive AwardInner-iteration preconditioning for large-scale ill-conditioned least squares problems
2013-03The Graduate University for Advanced Studies Research AwardInner-iteration preconditioning for large-scale ill-conditioned least squares problems
2013-03National Institute of Informatics (NII) Best Student Award
Articles
  • Analysis of the stabilized GMRES method
    Ken Hayami; Zeyu Liao; Keiichi Morikuni; Jun-Feng Yin
    JSIAM Annual Meeting 2021, Book of Abstract/pp.390-391, 2021
  • Projection method for eigenproblems of linear nonsquare matrix pencils
    Morikuni Keiichi
    JSIAM Annual Meeting 2021, Book of Abstract/pp.384-385, 2021
  • Projection method for eigenvalue problems of linear nonsquare matrix pencils
    Morikuni K.
    SIAM Journal on Matrix Analysis and Applications, to appear, 2021-06
  • Cross-interactive residual smoothing for global and block Lanczos-type solvers for linear systems with multiple right-hand sides
    Aihara K.; Imakura A.; Morikuni K.
    arXiv/arXiv:2106.00284 [math.NA]/pp.1-20, 2021-06
  • Kaczmarz-type inner-iteration preconditioned flexible GMRES methods for consistent linear systems
    Du Y.; Hayami K.; Zheng N.; Morikuni K.; Yin J.-F.
    SIAM Journal on Scientific Computing, accepted/pp.S345-366, 2021-06
  • Multiclass spectral feature scaling method for dimensionality reduction
    Matsuda M.; Morikuni Keiichi; Imakura A.; Ye X.; Sakurai T.
    Intelligent Data Analysis/24(6)/pp.1273-1287, 2020-12
  • Projection method for interior eigenproblems of linear nonsquare matrix pencils
    Morikuni K.
    arXiv/arXiv:2007.01183v3 [math.NA]/pp.1-20, 2020-11
  • A Stabilized GMRES Method for Solving Underdetermined Least Squares Problems
    Liao Z.; Hayami K.; Morikuni K.; Yin J.-F.
    arXiv/arXiv:2007.10853/pp.1-20, 2020-07
  • Online spectral classification for long-term spike sorting
    Sakamoto K.; Morikuni K.; Sakurai T.; Matsumoto S.; Vogt K.
    Proceedings of the third International Conference on Medical and Health Informatics 2020, accepted, 2020-07
  • Projection method for partial eigenproblems of linear matrix pencils
    Morikuni K.
    arXiv/arXiv:2007.01183 [math.NA]/pp.1-18, 2020-07
  • Kaczmarz-type inner-iteration preconditioned flexible GMRES methods for consistent linear systems
    Du Y.-S.; Hayami K.; Zheng N.; Morikuni K.; Yin J.-F.
    NII Technical Report/NII-2020-003E/pp.1-14, 2020-06
  • Kaczmarz-type inner-iteration preconditioned flexible GMRES methods for consistent linear systems
    Du Y.-S.; Hayami K.; Zheng N.; Morikuni K.; Ying J.-F.
    arXiv/arXiv:2006.10818/pp.1-17, 2020-06
  • A Stabilized GMRES Method for Solving Underdetermined Least Squares Problems
    Liao Z.; Hayami K.; Morikuni K.; Yin J.-F.
    NII Technical Report/NII-2020-001E/pp.1-20, 2020-03
  • Shifted Lanczos method for quadratic forms with Hermitian matrix resolvents
    Morikuni K.
    arXiv/2002.06738 [math.NA]/pp.1-16, 2020-02
  • Verified partial eigenvalue computations using contour integrals for Hermitian generalized eigenproblems
    Imakura A.; Morikuni K.; Takayasu A.
    Journal of Computational and Applied Mathematics/369(1), 2019-10
  • Multiclass spectral feature scaling method for dimensionality reduction
    Matsuda M.; Morikuni K.; Imakura A.; Ye X.; Sakurai T.
    arXiv:1910.07174 [cs.LG]/pp.1-16, 2019-10
  • Implementation of interior-point methods for LP based on Krylov subspace iterative solvers with inner-iteration preconditioning
    Cui Y.; Morikuni K.; Tsuchiya T.; Hayami K.
    Computational Optimization and Applications/74(1)/pp.143-176, 2019-06
  • Verified partial eigenvalue computations for Hermitian generalized eigenproblems using contour integrals
    Imakura A.; Morikuni K.; Takayasu A.
    arXiv:1904.06277 [math.NA]/pp.1-13, 2019-04
  • Inner-iteration preconditioning with symmetric splitting matrices for symmetric singular linear systems
    Morikuni K. (保國 惠一)
    Transactions of the Japan Society for Industrial and Applied Mathematics/29(1)/pp.62-77, 2019-03
  • 一般化エルミート固有値問題の周回積分型精度保証付き部分固有値計算
    今倉 暁; 保國 惠一; 高安 亮紀
    日本応用数理学会2018年度年会 予稿集/pp.189-190, 2018-09
  • Spectral feature scaling method for supervised dimensionality reduction
    Matsuda M.; Morikuni K.; Sakurai T.
    Proceedings of the Twenty-Seventh International Joint Conference on Artificial Intelligence (IJCAI-18), Main track/pp.2560-2566, 2018-07
  • Iterative Methods and Preconditioners for Linear Systems with Singularity
    保國 惠一 (Morikuni K.)
    Bulletin of the Japan Society for Industrial and Applied Mathematics/28(2)/pp.11-18, 2018-06
  • On GMRES for singular EP and GP systems
    Morikuni K.; Rozložník M.
    SIAM Journal on Matrix Analysis and Applications/39(2)/pp.1033-1048, 2018-06
  • 多クラス分類問題に対する スペクトラル特徴量スケーリング
    松田 萌望 (Matsuda M.); 保國 惠一 (Morikuni K.); 櫻井 鉄...
    Book of Abstracts, 47th Numerical Analysis Symposium (NAS2018)/pp.31-34, 2018-06
  • Verified Partial Eigenvalue Computation for Generalized Hermitian Eigenproblems Using Contour Integrals
    今倉 暁 (Imakura A.); 保國 惠一 (Morikuni K.); 高安 亮紀 ...
    Book of Abstracts, 47th Numerical Analysis Symposium (NAS2018)/pp.1-4, 2018-06
Books
  • 第3章 最小二乗乗問題の数値解法, 3.2 反復法
    保國 惠一
    数値線形代数の数理とHPC, 共立出版, pp.141-158, 2018-08
  • Inner-iteration Preconditioning for Least Squares Problems
    保國 惠一
    2013
Conference, etc.
  • Analysis of the stabilized GMRES method
    Hayami Ken; Liao Zeyu; Morikuni Keiichi; Yin Jun-Feng
    JSIAM Annual Meeting 2021/2021-09-07--2021-09-09
  • Projection method for eigenproblems of linear nonsquare matrix pencils
    保國 惠一
    JSIAM Annual Meeting 2021/2021-09-07--2021-09-09
  • Implementation of interior-point methods for LP based on Krylov subspace iterative solvers with inner-iteration preconditioning
    Cui Yiran; Morikuni Keiichi; Tsuchiya Takashi; Hayami Ken
    The 22nd Conference of the International Federation of Operational Research Societies (IFORS 2021), online/2021-08-23--2021-08-27
  • 無限次元固有値問題に対する複素モーメント型解法
    今倉 暁; 保國 惠一; 高安 亮紀
    2021年並列/分散/協調処理に関するサマー・ワークショップ (SWoPP2021), オンライン/2021-07-19--2021-07-21
  • GMRES Methods for Tomographic Reconstruction with an Unmatched Back Projector
    Hansen P. C.; Morikuni K.; Hayami K.
    SIAM Conference on Applied Linear Algebra (LA21)/2021-05-17--2021-05-23
  • On the Residual Gap of Block Lanczos-Type Methods and Its Remedy by Cross-Interactive Residual Smoothing
    Aihara K.; Imakura A.; Morikuni K.
    SIAM Conference on Applied Linear Algebra (LA21)/2021-05-17--2021-05-23
  • Kaczmarz-Type Inner-Iteration Preconditioned Flexible GMRES Methods for Consistent Linear Systems
    Du Y.-S.; Hayami K.; Zheng N.; Morikuni K.; Yin J.-F.
    SIAM Conference on Applied Linear Algebra (LA21)/2021-05-17--2021-05-23
  • Complex Moment-Based Methods for Differential Eigenvalue Problems
    Imakura A.; Morikuni K.; Takayasu A.
    SIAM Conference on Applied Linear Algebra (LA21)/2021-05-17--2021-05-23
  • Unmatched Projector/Backprojector Pairs and Algebraic Iterative Reconstruction
    Hansen P.C.; Dong Y.; Elfving T.; Hayami K.; Hochstenbach...
    Second Workshop on Numerical Algebra, Algorithm and Analysis/2021-03-16--2021-03-17
  • Kaczmarz-type inner-iteration preconditioned flexible GMRES methods for consistent linear systems
    Du Y.; Hayami K.; Zheng N.; Morikuni K.; Yin J.-F.
    Second Workshop on Numerical Algebra, Algorithm and Analysis/2021-03-16--2021-03-17
  • Implementation of interior-point methods for LP based on Krylov subspace iterative solvers with inner-iteration preconditioning
    Cui Y.; Morikuni K.; Tsuchiya T.; Hayami K.
    Second Workshop on Numerical Algebra, Algorithms and Analysis, online/2021-03-16--2021-03-17
  • Verifying eigenvalues of generalized Hermitian eigenproblems using contour integrals
    Imakura A.; Morikuni K.; Takayasu A.
    Second Workshop on Numerical Algebra, Algorithms and Analysis, online/2021-03-16--2021-03-17
  • 複数右辺ベクトルを持つ線形方程式に対するblock generalized CGS法
    今倉 暁; 相原 研輔; 保國 惠一
    日本応用数理学会 第17回研究部会連合発表会, オンライン/2021-03-04--2021-03-05
  • Sylvester方程式に対するglobal Krylov部分空間法のresidual gap評価とその改善
    相原 研輔; 今倉 暁; 保國 惠一
    日本応用数理学会 第17回研究部会連合発表会, オンライン/2021-03-04--2021-03-05
  • 漸化式に着目したblock Krylov部分空間法のresidual gap評価と残差スムージング
    相原 研輔; 今倉 暁; 保國 惠一
    日本応用数理学会「行列・固有値問題の解法とその応用」研究部会 第30回研究会, オンライン/2020-12-07--2020-12-07
  • エルミート行列レゾルベントの二次形式に対するシフト付きランチョス法
    保國 惠一
    日本応用数理学会 2020年 研究部会連合発表会, 東京/2020-03-04--2020-03-05
  • 対称行列レゾルベントの双線形形式に対するshifted Lanczos法
    保國 惠一
    日本応用数理学会「行列・固有値問題の解法とその応用」研究部会 第28回研究会/2019-12-02--2019-12-02
  • Time series motif discovery in matrix profiles via low-rank approximation
    Morikuni K. (保國 惠一)
    Japan SIAM Annual Meeting 2019, Tokyo, Japan/2019-09-03--2019-09-05
  • Semi-automatic spike sorting of long-term tetrode recording in mice
    松本 すみ礼; 保國 惠一; 松田 萌望; 坂本 航太郎; 大山 薫; ...
    The 42th Annual Meeting of the Japan Neuroscience Society, Niigata, Japan/2019-07-25--2019-07-28
  • On GMRES for linear EP and GP systems
    Rozložník M.; Morikuni K.
    International Congress on Industrial and Applied Mathematics (ICIAM2019), Valencia, Spain/2019-07-15--2019-07-19
  • "一般化エルミート固有値問題の部分固有値計算における周回積分に基づく精度保証法の改良"
    保國惠一; 今倉暁; 高安 亮紀
    日本応用数理学会 第15回 研究部会連合発表会/2019-3-4--2019-3-5
  • Verified computing for partial eigenvalues using a contour integral-type eigensolver
    Takayasu Akitoshi; Imakura Akira; Morikuni Keiichi
    SCAN2018/2018-9-10--2018-9-15
  • 一般化エルミート固有値問題の周回積分型精度保証付き部分固有値計算
    今倉 暁; 保國 惠一; 高安 亮紀
    日本応用数理学会2018年度年会/2018-9-3--2018-9-5
  • Verified partial eigenvalue computation for generalized Hermitian eigenproblems using contour integrals
    今倉暁; 保國 惠一; Takayasu Akitoshi
    第47回数値解析シンポジウム/2018-6-6--2018-6-8
  • Verified partial eigenvalue computation for generalized Hermitian eigenproblems using contour integrals
    今倉暁; 保國惠一; 高安 亮紀
    第47回数値解析シンポジウム, 福井/2019-06-07--2019-06-07
Works
  • NIILP: Linear Program Solver
    Cui Y.; Morikuni K.; Tsuchiya T.; Hayami K.
  • Implementation of AB-GMRES preconditioned by NE-SOR inner iterations
    Morikuni K.; Hayami K.
  • Implementation of BA-GMRES preconditioned by NR-SOR inner iterations
    Morikuni K.; Hayami K.
  • Splspc: Sparse Least Squares Preconditioned methods
    Hayami K.; Morikuni K.; Cui X.; Yin J.-Y.; Ito T.; Goepfe...
Teaching
2021-10 -- 2022-02Research in Computer Science IfUniversity of Tsukuba.
2021-10 -- 2022-02Computer Science Seminar BfUniversity of Tsukuba.
2021-04 -- 2021-08Research in Computer Science IIsUniversity of Tsukuba.
2021-10 -- 2022-02Seminar in Computer Science fUniversity of Tsukuba.
2021-10 -- 2022-02Basic Experiments in Human BiologyUniversity of Tsukuba.
2021-04 -- 2021-08Seminar in Computer ScienceUniversity of Tsukuba.
2021-10 -- 2022-02Seminar in Computer ScienceUniversity of Tsukuba.
2021-10 -- 2022-02Research in Computer Science fUniversity of Tsukuba.
2021-10 -- 2022-02Research in Computer Science IUniversity of Tsukuba.
2021-04 -- 2021-08Research in Computer Science IUniversity of Tsukuba.
Other educational activities
2021-04 -- (current)情報科学特別演習, 情報特別演習I, 情報特別演習II, ソフトウェアサイエンス主専攻 世話人筑波大学
2019-04 -- (current)クラス担任筑波大学
2018-04 -- 2020-03情報科学概論II ソフトウェアサイエンス主専攻 世話人筑波大学
2018-04 -- 2019-03情報科学概論I ソフトウェアサイエンス主専攻 世話人筑波大学
2017-04 -- 2019-03Facilitator, CS Seminar, Department of Computer ScienceUniversity of Tsukuba
Professional activities
2021-04 -- (current)The Japan Society for Industrial and Applied MathematicsEditorial Board of Transactions of the Japan Society for Industrial and Applied Mathematics/Editor
2021-04 -- (current)The Japan Society for Industrial and Applied MathematicsChair, Activity Group on Algorithms for Matrix / Eigenvalue Problems and their Applications
2018-04 -- (current)The Japan Society for Industrial and Applied MathematicsEditor, JSIAM Letters
2018-04 -- (current)The Japan Society for Industrial and Applied MathematicsSecretary, Activity Group on Algorithms for Matrix / Eigenvalue Problems and their Applications
2021-03 -- 2021-03Second Workshop on Numerical Algebra, Algorithms, and AnalysisOrganizing Committee
2018-04 -- 2021-03The Japan Society for Industrial and Applied MathematicsEditor, Bulletin of the Japan Society for Industrial and Applied Mathematics
2018-06 -- 2018-06Numerical Analysis Symposium 2018Executive Committee Member
2018-03 -- 2018-03International Workshop on Eigenvalue Problems (EPASA2018)Local Chair, Organizing Committee
2017-06 -- 2017-06Numerical Analysis Symposium 2017Executive Committee Member
2016-01 -- 2016-01Workshop on Numerical Algebra, Algorithms, and AnalysisOrganizing Committee
University Management
2019-04 -- (current)ヒューマニクス学位プログラム学生支援委員会委員
2019-04 -- (current)情報科学類カリキュラム委員会委員
2019-04 -- 2021-03CS専攻広報委員会委員
2019-04 -- 2021-03ファカルティデベロップメント (FD) 委員会委員
2018-09 -- 2018-12情報科学類教育用計算機システム技術審査委員会委員
2018-04 -- 2020-03スポーツ・デー運営委員会委員
2015-06 -- (current)ヒューマンバイオロジー学位プログラム教務委員会委員
2016-04 -- 2018-03情報科学類計算機運用委員会委員

(Last updated: 2021-09-14)