MORIKUNI Keiichi

Affiliation
Institute of Systems and Information Engineering
Official title
Assistant Professor
URL
Research fields
Mathematical informatics
Foundations of mathematics/Applied mathematics
Computational science
Research keywords
Numerical Computation
Numerical Analysis
Numerical Linear Algebra
Research projects
Development of a Foundation for Numerical Operator Algebras and its Applications2024-04 -- 2029-03Keiichi MORIKUNIJapan Society of for the Promotion of Science/Grant-in-Aid for Scientific Research (B)18,850,000Yen
Development of complex moment-based methods and mathematical risk avoidance techniques for infinite dimensional eigenvalue probl2021-04 -- (current)Akira ImakuraJapan 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/Grants-in-Aid for Young Scientific Research4,290,000Yen
Development of eigenvalue analysis methods using a quadrature-type eigensolver with nonlinear transformations2018-04 -- 2021-03Tetsuya SakuraiJapan 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 -- 2018-10Keiichi MorikuniUniversity 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 Eigensolvers with Perturbation-Proofness for Rectangular Matrix Pencils2017-08 -- 2018-07Keiichi MorikuniThe 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 -- 2021-03Keiichi MorikuniJapan Society of for the Promotion of Science/Grant-in-Aid for Young Scientists (B)4,030,000Yen
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Career history
2015-06 -- (current)University of TsukubaDivision of Information Engineering, Faculty of Engineering, Information and SystemsAssistant Professor
2014-04 -- 2015-05Akademie věd České republiky (Czech Academy of Sciences)　Ústav informatiky (Institute of Computer Science)　Postdoktorand (Postdoctoral Fellow, Czech Academy of Sciences Program of PostDoc Support)
2013-04 -- 2014-03National Institute of InformaticsFunding 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 StraProject researcher, Uno Laboratory
2008-05 -- 2013-02National Institute of InformaticsHayami LaboratoryResearch assistant
Academic background
2008-04 -- 2013-03The Graduate University for Advanced Studies (SOKENDAI) School of Multidisciplinary Sciences Department of Informatics (Five-year Doctoral Program)
2004-04 -- 2008-03Kyushu University School of Design Department of Acoustic Design
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
2023-06Best presentation award at the 2023 Joint Meeting of JSIAM Activity GroupsブロックLanczos型反復法の精度改善に向けた相互作用型残差スムージング (recipient: Kensuke Aihara, co-authors: Akira Imakura, Keiichi Morikuni)
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 (recipient: Momo Matsuda, co-authors: Keiichi Morikuni, Akira Imakura, Tetsuya Sakurai)
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
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.
  • Verified computation using complex moments for Mathieu and Schrödinger eigenvalue problems
    Akira Imakura; Keiichi Morikuni; Akitoshi Takayasu
    Nagoya International Workshop on Numerical Analysis 2024, Nagoya, Japan/2024-10-11--2024-10-11
  • 正則化最適輸送問題におけるスケーリングの影響
    榊原 航也; 高津 飛鳥; 保國 惠一
    日本応用数理学会2024年度年会, 京都/2024-09-16--2024-09-16
  • GMRES Methods for Tomographic Reconstruction with an Unmatched Back Projector
    Hayami Ken; Hansen Per Christian; Morikuni Keiichi
    Finland-Japan Workshop in Industrial and Applied Mathematics,/2024-08-26--2024-08-26
  • Cross-interactive residual smoothing for reducing the residual gap of block Lanczos-type iterative methods
    Aihara Kensuke; Imakura Akira; Morikuni Keiichi
    The 17th SIAM East Asian Section Conference (EASIAM2024), Macao, China/2024-06-30--2024-06-30
  • AB- and BA-GMRES Methods for X-Ray CT with an Unmatched Back Projector
    Hansen Per Christian; Hayami Ken; Morikuni Keiichi
    Big Data Inverse Problems, Edinburgh, Scotland/2024-05-20--2024-05-20
  • GMRES Methods for Tomographic Reconstruction with an Unmatched Back Projector
    保國 惠一
    2024 TWSIAM Annual Meting, Taichung, Taiwan/2024-05-18--2024-05-18
  • 相互作用型残差スムージングにおける近似解ノルムの影響について
    相原 研輔; 今倉 暁; 保國 惠一
    日本応用数理学会 第20回研究部会連合発表会, 長岡/2024-03-05--2024-03-05
  • 最適輸送問題のBregmanダイバージェンスによる正則化の誤差評価
    榊原 航也; 高津 飛鳥; 保國 惠一
    2023年度応用数学合同研究集会, 京都/2023-12-14--2023-12-14
  • 有限集合間の最適輸送のBregmanダイバージェンスによる正則化
    榊原 航也; 高津 飛鳥; 保國 惠一
    日本数学会 2023年度秋季総合分科会, 仙台/2023-09-22--2023-09-22
  • Cross-interactive residual smoothing for block Lanczos-type methods for solving linear systems with multiple right-hand sides
    Kensuke Aihara; Akira Imakura; Keiichi Morikuni
    Minisymposium on the Stability of Numerical Linear Algebra Algorithms, 10th International Congress on Industrial and Applied Mathematics/2023-08-24--2023-08-24
  • A projection method for singular eigenvalue problems of linear matrix pencils
    Morikuni Keiichi; Imakura Akira
    Minisymposium on the Stability of Numerical Linear Algebra Algorithms, 10th International Congress on Industrial and Applied Mathematics (ICIAM23), Tokyo, Japan/2023-08-23--2023-08-23
  • GMRES methods for tomographic reconstruction with an unmatched back projector
    Ken Hayami; Per Christian Hansen; Keiichi Morikuni
    Minisymposium on the Recent Developments on the Numerical Solution of Least Squares Problems, 10th International Congress on Industrial and Applied Mathematics, Tokyo, Japan/2023-08-21--2023-08-21
  • 微分作用素の固有値に対する複素モーメントを用いた精度保証付き数値計算
    今倉 暁; 保國 惠一; 高安 亮紀
    2023年並列／分散／協調処理に関するサマー・ワークショップ（SWoPP 2023）, 第35回「行列・固有値問題の解法とその応用」研究部会 単独研究会, 函館/2023-08-03--2023-08-03
  • 自己共役な微分作用素の固有値に対する周回積分型精度保証付き数値解法
    今倉 暁; 保國 惠一; 高安 亮紀
    第49回数値解析シンポジウム, 岩手/2023-07-13--2023-07-13
  • CGS系統のブロッククリロフ部分空間法の枠組み
    今倉 暁; 相原 研輔; 保國 惠一
    第49回数値解析シンポジウム, 岩手/2023-07-12--2023-07-12
  • GMRES Methods for Tomographic Reconstruction with an Unmatched Back Projector
    Hayami Ken; Hansen Per Christian; Morikuni Keiichi
    The Ninth China-Russia Conference on Numerical Algebra with Applications (CRCNAA 2023), Nanton, China/2023-07-11--2023-07-11
  • 無限次元固有値問題に対する複素モーメント型解法とその性能評価
    今倉暁; 保國惠一; 高安 亮紀
    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34回研究会/2022-12-06--2022-12-06
  • 一般化エルミート固有値問題に対するRayleigh-Ritz版の周回積分型精度保証付き部分固有対計算
    今倉暁; 保國惠一; 高安 亮紀
    日本応用数理学会2022年度年会/2022-09-10--2022-09-10
  • ブロックLanczos型反復法の精度改善に向けた相互作用型残差スムージング
    相原 研輔; 今倉 暁; 保國 惠一
    日本応用数理学会 第19回研究部会連合発表会, 岡山（ハイブリッド）/2023-03-08--2023-03-10
  • 離散最適輸送問題に対するBregmanダイバージェンス正則化の誤差評価
    保國 惠一; 榊原 航也; 高津 飛鳥
    日本応用数理学会 第19回研究部会連合発表会, 岡山（ハイブリッド）/2023-03-08--2023-03-10
  • Bregman divergence regularization of optimal transport problems on a finite set
    Asuka Takatsu; (joint work with; Koya Sakakibara; Keiichi...
    Kantorovich Initiative Seminar, online/2023-01-26--2023-01-26
  • 後退安定な直交化を用いたブロックLanczos解法の残差ギャップについて
    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34回単独研究会, オンライン/2022-12-06--2022-12-06
  • A projection method for eigenvalue problems of linear nonsquare matrix pencils
    保國 惠一; 今倉 暁
    Numerical Analysis for Future Information Society: from Edge to Fugaku/2022-10-12--2022-10-14
  • GMRES methods for tomographic reconstruction with an unmatched back projector
    Ken Hayami; Per Christian Hansen; Keiichi Morikuni
    18th Joint Meeting of Special Activity Groups 2022, The Japan Society of Industrial and Applied Mathematics/2022-03-08--2022-03-09
  • Implementation of interior-point methods for LP using Krylov methods preconditioned by inner iterations
    Yiran Cui; Keiichi Morikuni; Takashi Tsuchiya; Ken Hayami
    Workshop on Continuous Optimization and Related Topics/2021-11-27--2021-11-28
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Works
  • MATLAB codes for a projection method for eigenvalue problems of linear nonsquare matrix pencils
    Morikuni Keiichi
  • 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
2024-10 -- 2025-02Computer Science Seminar AfUniversity of Tsukuba.
2024-10 -- 2025-02Computer Science Seminar BfUniversity of Tsukuba.
2024-04 -- 2024-08Research in Computer Science IsUniversity of Tsukuba.
2024-10 -- 2025-02Research in Computer Science IIfUniversity of Tsukuba.
2024-04 -- 2024-08Computer Science Seminar BUniversity of Tsukuba.
2024-10 -- 2025-02Computer Science Seminar BUniversity of Tsukuba.
2024-10 -- 2025-02Research in Computer Science DUniversity of Tsukuba.
2024-10 -- 2025-02Research in Computer Science BUniversity of Tsukuba.
2024-10 -- 2025-02Research in Computer Science fUniversity of Tsukuba.
2024-10 -- 2025-02Research in Computer Science AUniversity of Tsukuba.
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Other educational activities
2019-04 -- (current)クラス担任筑波大学
2021-04 -- 2023-03情報科学特別演習, 情報特別演習I, 情報特別演習II世話人（ソフトウェアサイエンス主専攻）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
2024-01 -- (current)Japan Journal of Industrial and Applied MathematicsEditor
2021-04 -- (current)The Japan Society for Industrial and Applied MathematicsEditorial Board of Transactions of the Japan Society for Industrial and Applied Mathematics/Editor
2018-04 -- (current)The Japan Society for Industrial and Applied MathematicsCommittee Member, Activity Group on Algorithms for Matrix / Eigenvalue Problems and their Applications
2022-04 -- 2023-03The Japan Society for Industrial and Applied MathematicsRepresentative Member
2021-04 -- 2023-03The Japan Society for Industrial and Applied MathematicsChair, Activity Group on Algorithms for Matrix / Eigenvalue Problems and their Applications
2021-11 -- 2021-11Workshop on Continuous Optimization and Related TopicsOrganizer
2021-03 -- 2021-03Second Workshop on Numerical Algebra, Algorithms, and AnalysisOrganizing Committee
2018-06 -- 2018-06Numerical Analysis Symposium 2018Executive Committee Member
2018-04 -- 2024-03The Japan Society for Industrial and Applied MathematicsSecretary, Activity Group on Algorithms for Matrix / Eigenvalue Problems and their Applications
2018-04 -- 2022-03The Japan Society for Industrial and Applied MathematicsEditor, JSIAM Letters
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University Management
2024-04 -- (current)情報理工学位プログラム 学務・学生委員会委員
2024-04 -- (current)情報科学類 計算機運用委員会委員
2023-04 -- (current)情報理工学位プログラム ダイバーシティ・アクセシビリティ担当
2023-04 -- (current)情報工学域 計算機運用委員会委員
2023-04 -- (current)情報科学類 広報企画委員会委員
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
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
2022-04 -- 2024-03スポーツ・デー運営委員会委員
2019-04 -- 2022-03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
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(Last updated: 2024-10-17)