Morikuni Keiichi

Affiliation and department：
Job title： Assistant Professor
Homepage URL (1)： https://www.u.tsukuba.ac.jp/~morikuni.keiichi.fw/

Research field (3)： Applied mathematics and statistics , Mathematical informatics , Computational science

Research keywords (7)： Singular Systems of Equations , Least Squaers Problems , Eigenvalue Problems , Preconditioning , Optimization , Regularization , Numerical verification

Research theme for competitive and other funds (11)：

2024 - 2029 数値作用素代数の基盤創出とその応用
2021 - 2026 Development of complex moment-based methods and mathematical risk avoidance techniques for infinite dimensional eigenvalue problems
2020 - 2024 Robust and Efficient Numerical Methods for Matrix Problems with Singularity
2018 - 2021 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
2016 - 2020 Robust and Efficient Numerical Solutions of Large Sparse Constrained Eigenproblems

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Papers (22)：

Akira Imakura, Keiichi Morikuni, Akitoshi Takayasu. Verified eigenvalue and eigenvector computations using complex moments and the Rayleigh-Ritz procedure for generalized Hermitian eigenvalue problems. Journal of Computational and Applied Mathematics. 2023. 424. 114994. 1-18
Akira Imakura, Keiichi Morikuni, Akitoshi Takayasu. Complex moment-based methods for differential eigenvalue problems. Numerical Algorithms. 2022. 92. 693-721
Kensuke Aihara, Akira Imakura, Keiichi Morikuni. Cross-interactive residual smoothing for global and block Lanczos-type solvers for linear systems with multiple right-hand sides. SIAM Journal on Matrix Analysis and Applications. 2022. 43. 3. 1308-1330
Per Christian Hansen, Ken Hayami, Keiichi Morikuni. GMRES methods for tomographic reconstruction with an unmatched back projector. Journal of Computational and Applied Mathematics. 2022. 413. 1-20
Zeyu Liao, Ken Hayami, Keiichi Morikuni, Jun-Feng Yin. A stabilized GMRES method for singular and severely ill-conditioned systems of linear equations. Japan Journal of Industrial and Applied Mathematics. 2022. 39. 717-751

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MISC (36)：

Ken Hayami, Keiichi Morikuni, Lothar Reichel, Ning Zheng. Editorial: Recent advances in the numerical solution of matrix problems. Journal of Computational and Applied Mathematics. 2023. 430. 115239-115239
Keiichi Morikuni, Koya Sakakibara, Asuka Takatsu. Error estimate for regularized optimal transport problems via Bregman divergence. arXiv. 2023. arXiv:2309.11666 [math.OC]. 1-19
保國惠一. 研究部会「行列・固有値問題の解法とその応用」の活動状況. JSIAM Online Magazine. 2022
Akira Imakura, Keiichi Morikuni, Akitoshi Takayasu. Complex moment-based methods for differential eigenvalue problems. arXiv. 2022. arXiv:2205.00971 [math.NA]. 1-25
保國惠一. 「行列・固有値問題の解法とその応用」研究部会第32回研究会参加報告. JSIAM Online Magazine. 2022

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Books (1)：

数値線形代数の数理とHPC
共立出版 2018 ISBN:9784320019553

Lectures and oral presentations (153)：

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
(日本応用数理学会第20回研究部会連合発表会, 長岡 2024)
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
(2023年度応用数学合同研究集会, 京都 2023)
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
(日本数学会 2023年度秋季総合分科会, 仙台 2023)
Cross-interactive residual smoothing for block Lanczos-type methods for solving linear systems with multiple right-hand sides
(Minisymposium on the Stability of Numerical Linear Algebra Algorithms, 10th International Congress on Industrial and Applied Mathematics, Tokyo, Japan 2023)
A projection method for singular eigenvalue problems of linear matrix pencils
(Minisymposium on the Stability of Numerical Linear Algebra Algorithms, 10th International Congress on Industrial and Applied Mathematics (ICIAM23), Tokyo, Japan 2023)

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Works (5)：

MATLAB codes for a projection method for eigenvalue problems of linear nonsquare matrix pencils
Keiichi Morikuni 2021 -
NIILP: Linear Program Solver
Cui, Y, Morikuni, K, Tsuchiya, T, Hayami, K 2019 -
Implementation of AB-GMRES preconditioned by NE-SOR inner iterations
Morikuni, K, Hayami, K 2015 -
Implementation of BA-GMRES preconditioned by NR-SOR inner iterations
Morikuni, K, Hayami, K 2013 -
Splspc: Sparse Least Squares Preconditioned methods
Ken Hayami, Keiichi Morikuni, Xiaoke Cui, Jun-Feng Yin, Tokushi Ito, Benoit Goepfert, Michael Baudin 2011 -

Education (2)：

2008 - 2013 The Graduate University for Advanced Studies (SOKENDAI) School of Multidisciplinary Sciences Five-year Doctoral Program, Department of Informatics (Supervisor: Ken Hayami)
2004 - 2008 Kyushu University School of Design Department of Acoustic Design (Supervisor: Toshiya Samejima)

Professional career (2)：

Bachelor of Design (Kyushu University)
Doctor of Philosophy (The Graduate University for Advanced Studies (SOKENDAI))

Work history (4)：

2015/06 - 現在 University of Tsukuba Department of Computer Science, Institute of Systems and Information Engineering Assistant Professor
2014/04 - 2015/05 Czech Academy of Sciences Institute of Computer Science Postdoctoral Fellow
2013/04 - 2014/03 National 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 Strategic Social Services Enabled by the Database Engine Project researcher, Uno Laboratory
2008/05 - 2013/02 National Institute of Informatics Hayami Laboratory Research assistant

Committee career (13)：

2024/01 - 現在 Japan Journal of Industrial and Applied Mathematics Editor
2021/04 - 現在 Editorial Board of Transactions of the Japan Society for Industrial and Applied Mathematics, The Japan Society for Industrial and Applied Mathematics Editor
2014/11 - 現在数理人セミナー世話人
2018/04 - 2024/03 Activity Group on Algorithms for Matrix / Eigenvalue Problems and their Applications, The Japan Society for Industrial and Applied Mathematics (JSIAM) Secretary
2022/04 - 2023/03 The Japan Society for Industrial and Applied Mathematics (JSIAM) Representative Member

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Awards (9)：

2023/06 - The Japan Society for Industrial and Applied Mathematic Best 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 (共著者: 今倉暁, 保國惠一)
2018/09 - The Japan Society for Industrial and Applied Mathematics (JSIAM) Best 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 (共著者: 保國惠一, 今倉暁, 櫻井鉄也)
2017/09 - The Japan Society for Industrial and Applied Mathematics (JSIAM) Best 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 (共著者: 今倉暁, 保國惠一)
2017/06 - The Japan Society for Industrial and Applied Mathematics (JSIAM) Best 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)
2015/02 - Inoue Foundation for Science Inoue Research Award for Young Scientists Inner-iteration preconditioning for least squares problems

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Association Membership(s) (5)：

International Linear Algebra Society, ILAS , Society for Industrial and Applied Mathematics, SIAM , The Japan Society for Industrial and Applied Mathematics, JSIAM , Information Processing Society of Japan, IPSJ , Acoustical Society of Japan, ASJ

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