Morikuni Keiichi

Affiliation

Faculty of Engineering, Information and Systems

Official title

Assistant Professor

URL

https://www.u.tsukuba.ac.jp/~morikuni.keiichi.fw/

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 probl	2021-04 -- (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 Singularity	2020-04 -- (current)	Keiichi Morikuni	Japan Society of for the Promotion of Science/Grant-in-Aid for Early-Career Scientists	4,290,000Yen
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 Arithmetic	2018-10 -- 2018-10	Morikuni, K.	University of Tsukuba/Short-Term Overseas Travel Grant Program in 2018	400,000Yen
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 Pencils	2017-08 -- 2018-07	Morikuni, K.	The Hattori Hokokai Foundation, Public Interest Incorporated Foundation/Grant-in-Aid for Engineering Research	1,000,000Yen
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 -- 2018-03	Imakura, 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 -- 2017-03	Imakura, 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 problems	2016-04 -- 2021-03	Morikuni, K.	Japan Society of for the Promotion of Science/Grant-in-Aid for Scientific Research	4,030,000Yen
Design and analysis of solution methods for large-scale least squares problems	2010-06 -- 2010-07	Morikuni, K.	The Graduate University for Advanced Studies/Sokendai Short-stay Study Abroad Program 2010	400,000Yen

Career history


2015-06 -- (current)	University of TsukubaDivision of Information Engineering, Faculty of Engineering, Information and SystemsAssistant Professor
2014-04 -- 2015-05	Czech Academy of SciencesInstitute of Computer SciencePostdoctoral Fellow (Czech Academy of Sciences Program of PostDoc Support)
2013-04 -- 2014-03	National 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 -- 2013-02	National Institute of InformaticsHayami LaboratoryResearch assistant

Academic background


2008-04 -- 2013-03	The Graduate University for Advanced Studies (SOKENDAI) School of Multidisciplinary Sciences Department of Informatics (Five-year Doctoral Program)
2004-04 -- 2008-03	Kyushu University School of Design Department of Acoustic Design

Degree


2013-03	Doctor of Philosophy	The Graduate University for Advanced Studies
2008-03	Bachelor of Design	Kyushu 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 -- 2014	Information Processing Society of Japan
2008 -- 2013	Acoustical Society of Japan

Honors & Awards


2018-09	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
2017-09	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 (Contour integral-type verified partial eigenvalue computation via errors of complex moments)
2017-06	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 Research Award for Young Scientists	Inner-iteration preconditioning for least squares problems
2013-07	SIAM Student Paper Prize	Inner-Iteration Krylov Subspace Methods for Least Squares Problems, SIAM J. Matrix Anal. Appl., 34 (2013), pp. 1-22"
2013-03	The Graduate University for Advanced Studies Nagakura Research Incentive Award	Inner-iteration preconditioning for large-scale ill-conditioned least squares problems
2013-03	The Graduate University for Advanced Studies Research Award	Inner-iteration preconditioning for large-scale ill-conditioned least squares problems
2013-03	National Institute of Informatics (NII) Best Student Award

Articles

Verified eigenvalue and eigenvector computations using complex moments and the Rayleigh-Ritz procedure for generalized Hermitian eigenvalue problems
Akira Imakura; Keiichi Morikuni; Akitoshi Takayasu
Journal of Computational and Applied Mathematics/424/pp.1-18, 2022-12-20
Complex moment-based methods for differential eigenvalue problems
Imakura Akira; Morikuni Keiichi; Takayasu Akitoshi
Numerical Algorithms, 2022-12-12
Cross-interactive residual smoothing for global and block Lanczos-type solvers for linear systems with multiple right-hand sides
Aihara Kensuke; Imakura Akira; Morikuni Keiichi
SIAM Journal on Matrix Analysis and Applications/43(3)/pp.1308-1330, 2022-08
Complex moment-based methods for differential eigenvalue problems
Imakura Akira; Morikuni Keiichi; Takayasu Akitoshi
arXiv/arXiv:2205.00971 [math.NA]/pp.1-25, 2022-05
GMRES methods for tomographic reconstruction with an unmatched back projector
Hansen Per Christian; Hayami Ken; Morikuni Keiichi
Journal of Computational and Applied Mathematics/413, 2022-04
A stabilized GMRES method for singular and severely ill-conditioned systems of linear equations
Liao Zeyu; Hayami Ken; Morikuni Keiichi; Yin Jun-Feng
Japan Journal of Industrial and Applied Mathematics/39(2)/pp.717-751, 2022-03
Verified eigenvalue and eigenvector computations using complex moments and the Rayleigh-Ritz procedure for generalized Hermitian eigenvalue problems
Imakura Akira; Morikuni Keiichi; Takayasu Akitoshi
arXiv/arXiv:2110.01822 [math.NA]/pp.1-18, 2021-10
GMRES Methods for Tomographic Reconstruction with an Unmatched Back Projector
Hansen Per Christian; Hayami Ken; Morikuni Keiichi
arXiv/arXiv:2110.01481 [math.NA]/pp.1-25, 2021-10
Analysis of the stabilized GMRES method
Ken Hayami; Zeyu Liao; Keiichi Morikuni; Jun-Feng Yin
Proceedings of the 2021 JSIAM Annual Meeting/pp.390-391, 2021-09
Projection method for eigenproblems of linear nonsquare matrix pencils
Morikuni Keiichi
Proceedings of the 2021 JSIAM Annual Meeting/pp.384-385, 2021-09
Projection method for eigenvalue problems of linear nonsquare matrix pencils
Morikuni Keiichi
SIAM Journal on Matrix Analysis and Applications/42(3)/pp.1381-1400, 2021-09
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 Yi-Shu; Hayami Ken; Zheng Ning; Morikuni Keiichi; Yin ...
SIAM Journal on Scientific Computing/43(5)/pp.S345-366, 2021-06
Online spectral classification for long-term spike sorting
Sakamoto Kotaro; Morikuni Keiichi; Sakurai Tetsuya; Matsu...
Proceedings of the 2021 5th International Conference on Medical and Health Informatics/pp.89-97, 2021-05
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
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
Tsukuba Repository
more...

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.

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
GMRES methods for tomographic reconstruction with an unmatched back projector
Hansen Per Christian; Hayami Ken; Morikuni Keiichi
36th SIP Symposium 2021, online/2021-11-09--2021-11-12
GMRES methods for tomographic reconstruction with an unmatched back projector
Hansen Per Christian; Hayami Ken; Morikuni Keiichi
Numerical Methods and Scientific Computing (NMSC21)/2021-11-08--2021-11-12
Normal equations can be more stable than equations
Hayami Ken; Liao Zeyu; Morikuni Keiichi; Yin Jun-Feng
Numerical Methods and Scientific Computing (NMSC21)/2021-11-08--2021-11-12
Eigensolvers using complex moments for operators
Imakura Akira; Morikuni Keiichi; Takayasu Akitoshi
Numerical Methods and Scientific Computing (NMSC21)/2021-11-08--2021-11-12
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
more...

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


2022-04 -- 2022-08	Computer Science Seminar B	University of Tsukuba.
2022-10 -- 2023-02	Computer Science Seminar B	University of Tsukuba.
2022-10 -- 2023-02	Basic Experiments in Human Biology	University of Tsukuba.
2022-10 -- 2023-02	Computer Science Seminar Bf	University of Tsukuba.
2022-10 -- 2023-02	Seminar in Computer Science f	University of Tsukuba.
2022-10 -- 2023-02	Research in Computer Science f	University of Tsukuba.
2022-10 -- 2023-02	Research in Computer Science If	University of Tsukuba.
2022-04 -- 2022-08	Research in Computer Science I	University of Tsukuba.
2022-10 -- 2023-02	Research in Computer Science I	University of Tsukuba.
2022-04 -- 2022-08	Seminar in Computer Science s	University of Tsukuba.
more...

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世話人（ソフトウェアサイエンス主専攻）	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 -- 2019-03	Facilitator, CS Seminar, Department of Computer Science	University of Tsukuba

Professional activities


2022-04 -- (current)	The Japan Society for Industrial and Applied Mathematics	Representative Member
2021-04 -- (current)	The Japan Society for Industrial and Applied Mathematics	Editorial Board of Transactions of the Japan Society for Industrial and Applied Mathematics/Editor
2021-04 -- (current)	The Japan Society for Industrial and Applied Mathematics	Chair, Activity Group on Algorithms for Matrix / Eigenvalue Problems and their Applications
2018-04 -- (current)	The Japan Society for Industrial and Applied Mathematics	Secretary, Activity Group on Algorithms for Matrix / Eigenvalue Problems and their Applications
2018-04 -- 2022-03	The Japan Society for Industrial and Applied Mathematics	Editor, JSIAM Letters
2021-11 -- 2021-11	Workshop on Continuous Optimization and Related Topics	Organizer
2021-03 -- 2021-03	Second Workshop on Numerical Algebra, Algorithms, and Analysis	Organizing Committee
2018-04 -- 2021-03	The Japan Society for Industrial and Applied Mathematics	Editor, Bulletin of the Japan Society for Industrial and Applied Mathematics
2018-06 -- 2018-06	Numerical Analysis Symposium 2018	Executive Committee Member
2018-03 -- 2018-03	International Workshop on Eigenvalue Problems (EPASA2018)	Local Chair, Organizing Committee
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University Management


2022-04 -- (current)	スポーツ・デー運営委員会	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
2019-04 -- 2022-03	情報科学類カリキュラム委員会	委員
2019-04 -- 2021-03	CS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
2018-04 -- 2020-03	スポーツ・デー運営委員会	委員
2016-04 -- 2018-03	情報科学類計算機運用委員会	委員

(Last updated: 2023-03-17)