Ken Hayami

J-GLOBAL         Last updated: Jan 3, 2020 at 17:16
 
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Name
Ken Hayami
E-mail
hayaminii.ac.jp
URL
http://research.nii.ac.jp/~hayami/index-e.html
Affiliation
National Institute of Informatics
Research funding number
20251358

Profile

 I am doing research and teaching on the theory and application of numerical computation. Emphasis is on the mathematical analysis of numerical algorithms and the development of new algorithms.
Main areas of my present research interests are numerical linear algebra (iterative solution of linear systems, least squares problems, constrained and nonlinear least squares problems) and its application to optimization, inverse problems, and ill-posed problems.

Research Areas

 
 
  • Computational science / Computational science / mathematical engineering, applied mathematics, numerical analysis, numerical linear algebra

Academic & Professional Experience

 
Apr 2006
 - 
Today
Professor, Principles of Informatics Research Division, National Institute of Informatics
 
Apr 2004
 - 
Today
Professor, Department of Informatics, School of Multidisciplinary Sciences, The Graduate University for Advanced Studies
 
Apr 2006
 - 
Mar 2008
Head, Department of Informatics, School of Multidisciplinary Sciences, The Graduate University for Advanced Studies
 
Jan 2001
 - 
Mar 2006
Professor, Mathematical Informatics, Foundations of Informatics Research Division, National Institute of Informatics
 
Apr 2002
 - 
Mar 2004
Professor, Department of Informatics, School of Mathematical and Physical Science, The Graduate University for Advanced Studies
 

Published Papers

 
Secant Variable Projection Method for Solving Separable Nonnegative Least Squares Problems
Song, X., Xu, W., Hayami, K., and Zheng, N.,
Numerical Algorithms, (accepted for publication)      Oct 2019   [Refereed]
Right Preconditioned MINRES for Singular Systems
Sugihara, K., Hayami, K., and Zheng, N.,
Numerical Linear Algebra with Applications, (accepted for publication).   1-28   Oct 2019   [Refereed]
Cui, Y., ·Morikuni, K., Tsuchiya, T., and Hayami, K.,
Computational Optimization and Applications (accepted)   74(1) 143-176   Jun 2019   [Refereed]
Ishii, M., Nunohiro, E., and Hayami, K.
Transactions of the Japan Society for Industrial and Applied Mathematics   29(2) 225-249   Jun 2019   [Refereed]
Bai, Z.-Z., Buccini, A., Hayami, K., Reichel, L., Yin, J.-F., Zheng, N.,
Journal of Computational and Applied Mathematics   319 1-13   Aug 2017   [Refereed]

Books etc

 
A Projection Transformation Method for Nearly Singular Surface Boundary Element Integrals (Lecture Notes in Engineering, Vol. 73)
Hayami, K
Springer Verlag, 456 pages   Jan 1992   ISBN:3-540-55000-3
http://link.springer.com/book/10.1007/978-3-642-84698-4/page/1

Conference Activities & Talks

 
Du, Y., Hayami, K., Zheng, N., and Yin, J.-F.,
28th Meeting of the Japan SIAM Special Interest Group on Algorithms for Matrix / Eigenvalue Problems and their Applications, Ichigaya Campus, Hosei University   2 Dec 2019   
Greedy Kaczmarz inner-iteration preconditioning for least squares problems
Du, Y., Hayami, K., Zheng, N., and Yin, J.-F.
The Workshop on Randomized Iteration Methods and Theory, Xi'an Jiaotong-Liverpool University (XJTLU), Suzhou,   8 Nov 2019   
Zheng, N., Hayami, K.
Open Symposium of Research Institute for Mathematical Sciences, (RIMS), Kyoto University, Numerical methods for Analysis as a Base Integrating Various Scientific Fields   6 Nov 2019   
Hayami, K., Aoki, Y., Toshimoto, K., Sugiyama, Y.,
Chem-Bio Informatics Society(CBI) Annual Meeting 2019   22 Oct 2019   
Hayami, K., Aoki, Y., Toshimoto, K., Sugiyama, Y.,
Chem-Bio Informatics Society(CBI) Annual Meeting 2019,   22 Oct 2019   

Teaching Experience

 
 

Misc

 
Aoki, Y., Hayami, K., Toshimoto, K., and Sugiyama, Y.,
https://arxiv.org/abs/1808.06714      Oct 2018
Ken Hayami
NII Technical Reports, arXiv   NII-2018(001E) 1-7   Jun 2018
In this short paper, we analyze the convergence of the Conjugate Gradient (CG)
method in exact arithmetic, when the coefficient matrix A is symmetric positive
semidenite and the system is consistent. To do so, we diagonalize A and decompose
the al...
Cui, Y., Morikuni, K., Tsuchiya, T., and Hayami, K.
NII Technical Reports, National Institute of Informatics, Tokyo, arXiv   NII-2016(003E) 1-27   May 2016
Ken Hayami
JSIAM Online Magazine      Nov 2015   [Invited]
Modulus-Type Inner Outer Iterative Methods for Nonnegative Constrained Least Squares Problems
Zheng, N., Hayami, K., Yin, J.-F.
NII Technical Reports, National Institute of Informatics, Tokyo   NII-2015(001E) 1-23   Jan 2015

Awards & Honors

 
Jun 2018
Fellow, The Japan Society for Industrial and Applied Mathematics
 
Sep 2015
"Cluster Newton Method for Underdetermined Inverse Problems and its Application to Pharmacokinetics Model", 2015 Best Author Prize, The Japan Society for Industrial and Applied Mathematics
Winner: Yasunori Aoki, Ken Hayami, Akihiko Konagaya
 
Jul 2013
for the paper: Morikuni, K., and Hayami, K., Inner-iteration Krylov subspace methods for least squares problems, SIAM Journal on Matrix Analysis and Applications, Vol. 34, No. 1, pp. 1-22, 2013., SIAM Student Paper Prize, ( http://siam.org/prizes/sponsored/student_paper.php ) , Society for Industrial and Applied Mathematics (SIAM)
Winner: Keiichi Morikuni
 
Jul 2011
for the poster: "Aoki, Y., Hayami, K., Konagaya, A., and De Sterck, H., An Algorithm for Solving Underdetermined Inverse Problems: Application to Parameter Identification for a Pharmacokinetics Model, First Prize in the AC.CES poster awarded to Mr. Yasunori Aoki, Aachen Conference on Computational Engineering Science (AC.CES), ( http://www.acces11.rwth-aachen.de/MainContents/News.php )
Winner: Yasunori Aoki
 
Oct 2010
for the paper: “Ken Hayami, Jun-Feng Yin and Tokushi Ito, GMRES methods for least squares problems, SIAM Journal on Matrix Analysis and Applications, 31:5(2010), 2400-2430”., The Applied Numerical Algebra Prize,, Numerical Algebra Group, China Society of Computational Mathematics (CSCM), (http://lsec.cc.ac.cn/~NASCNAG/Prize.html).
Winner: Jun-Feng Yin
 

Research Grants & Projects

 
MInistry of Education, Culture, Sports, Science and Technology in Japan: Grants-in-Aid for Scientific Research (C)
Project Year: Apr 2015 - Mar 2018    Investigator(s): Ken Hayami
MInistry of Education, Culture, Sports, Science and Technology in Japan: Grants-in-Aid for Scientific Research (B)
Project Year: Apr 2015 - Mar 2018    Investigator(s): Takashi Tsuchiya
MInistry of Education, Culture, Sports, Science and Technology in Japan: Grants-in-Aid for Scientific Research (C)
Project Year: Apr 2012 - Mar 2014    Investigator(s): Ken Hayami
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2009 - 2011    Investigator(s): Ken HAYAMI
Least squares problems arise, for instance, when one wants to find a solution to system of linear equations where there are more equations than unknowns. Such problems arise in science, engineering and sociology, for instance, in statistics, surve...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2005 - 2007    Investigator(s): Ken HAYAMI
Research was done on applying the Generalized Minimal Residual (GMRES) method, which is a Krylov subspace iterative method for solving systems of linear equations, to large scale least squares problems by using mapping matrices. More specifically,...

Works

 
Aoki, Y., and Hayami, K.   Software   Dec 2018
GUI software: http://www.bluetree.me/CGNmethod_for_PBPKmodels 

Matlab code available in Matlab central file exchange: https://jp.mathworks.com/matlabcentral/fileexchange/68798-cluster-gauss-newton-method

 
Yasunori Aoki   Software   Mar 2016
Software related to:
Aoki, Y., Hayami, K., De Sterck, H. and Konagaya, A.,
Cluster Newton method for sampling multiple solutions of an underdetermined inverse problem:
Parameter identification for pharmacokinetics,
SIAM Journal on Scientific Comp...
Yasunori Aoki, Philippe Gaudreau   Software   2014 - 2015
Software related to
[1]Yasunori Aoki, Ken Hayami, Hans De Sterck, Akihiko Konagaya: Cluster Newton Method for Sampling Multiple Solutions of Underdetermined Inverse Problems:Application to a Parameter Identification Problem in Pharmacokinetics, SI...
Keiichi Morikuni   Software   2014
Codes related to
[1] Morikuni, K. and Hayami, K., Inner-iteration Krylov subspace methods for least squares problems, SIAM Journal on Matrix Analysis and Applications, Volume 34, Number 1, pages 1-22, 2013.
[2] Morikuni, K. and Hayami, K., Conve...

Education

 
Mar 1993
 - 
Mar 1993
Doctor of Engineering, The University of Tokyo
 
Jun 1991
 - 
Jun 1991
Doctor of Philosophy (Ph.D.), Wessex Institute of Technology, Council for National Academic Awards, U.K.,
 
Apr 1979
 - 
Mar 1981
Master Course Degree, Department of Mathematical Engineering and Instrumentation Physics, The Graduate School of Engineering, The University of Tokyo
 
Apr 1977
 - 
Mar 1979
Bachelor Degree, Department of Mathematical Engineering and Instrumentation Physics (Mathematical Engineering Course), Faculty of Engineering, The University of Tokyo
 
Apr 1975
 - 
Mar 1977
Sciences 1, School of Arts and Sciences, The University of Tokyo, Entrance
 

Committee Memberships

 
2014
 - 
Today
Electronic Transactions on Numerical Analysis  Member of Editorial Board
 
Apr 2013
 - 
Mar 2017
JSIAM Letters  Associate Editor
 
2012
 - 
Today
Numerical Algorithms  Member of Editorial Board
 
2010
 - 
Today
Japan Journal of Industrial and Applied Mathematics  Associate Editor (Area <2>)
 
2010
 - 
2016
Numerical Algebra, Control and Optimization  Member of Editorial Board