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Directory Database of Research and Development Activitie

Japanese

HAYAMI Ken

Revised Date 2009.10.23
Researcher Name HAYAMI Ken
Organization Name,Department Name,Job Title
1. Research Organization of Information and Systems National Institute of Informatics

Professor
Address 2-1-2, Hitotsubashi, Chiyoda-ku, Tokyo, 101-8430, Japan
Fax +81-3-3556-1916 (Secretaries' office)
Research Field Fundamental informatics ,General mathematics (includes probability theory/statistical mathematics) ,Fundamental engineering
Keywords for Research Field Numerical Analysis, Mathematical Engineering
Research Theme
1. Iterative solution of singular systems
numerical linear algebra, system of linear equations, least squares problem, Krylov subspace methods, singular systems, GMRES, GCR(k) GCR(k), GMRES
The theoretical analysis of the behaviou of Krylov subspace iterative methods, such as GMRES and GCR(k), on systems of linear equations with a singular coefficient matrix.
Research Field： Fundamental engineering , General mathematics (includes probability theory/statistical mathematics) , Fundamental informatics
（Individual） 1998－   The Other Research Programs
2. Iterative solution of least squares problems
iterative solution, least squares problem, GMRES, Krylov subspace method, preconditoner
Application of the generalized minimal residual method (GMRES) to over and under-determined least squares problems using a preconditioning mapping matrix.
Research Field： Fundamental engineering , General mathematics (includes probability theory/statistical mathematics) , Fundamental informatics
（Collaboration in Organization） 2001－   The Other Research Programs
3. Numerical solution of systems of algebraic equations
systems of algebraic equations, MEG, inverse problem, iterative method
Iterative methods for systems of algebraic equations arising in MEG inverse problems.
Research Field： Fundamental engineering , General mathematics (includes probability theory/statistical mathematics) , Fundamental informatics
（Collaboration in Japan） 2002－   The Other Research Programs
Homepage URL
http://research.nii.ac.jp/~hayami/official/content_e.html
Research Result (papers and notes)
(22cases)
1. The scaled conjugate gradient method and vector processors
Proceedings of the First International Conference on Supercomputing Systems, St. Petersburg, Florida, IEEE Computer Society （Hayami, K. and Harada, N., ,Academic Journal ,1985 ） / , 213-221
2. A new coordinate transformation method for singular and nearly singular integrals over general curved boundary elements
C.A.Brebbia, W.L. Wendland and G. Kuhn eds., Boundary Elements IX, Proc. 9th Int. Conf. on Boundary Elements, Stuttgart, Computational Mechanics Publication with Springer-Verlag （Hayami, K. and Brebbia, C.A., ,Academic Journal ,1987 ） 1 / , 375-399
3. Quadrature methods for singular and nearly singular integrals in 3-D boundary element method, (Invited Paper)
C.A. Brebbia ed., Boundary Elements X, Proc. 10th Int.Conf. on Boundary Elements, Southampton, Computational Mechanics Publication with Springer-Verlag （Hayami, K. and Brebbia, C.A., ,Academic Journal ,1988 ） 1 / , 237-264
Further display
Research Result (publications)
(1cases)
1. A Projection Transformation Method for Nearly Singular Surface Boundary Element Integrals （Springer-Verlag (Lecture Notes in Engineering) ,1992 ）
Research Result (other activities)
(2cases)
1. Electric potential and field computation using the fast multipole expansion method （Funded research, etc ,2000 ）
2. Simulation of electron guns using the fast multipole method （Funded research, etc ,1993-1996 ）
Graduate School
1. The University of Tokyo
Master （Graduate School, Division of Engineering ,Department of Mathematical Engineering and Instrumentation Physics ）
1981 （Completed ）
Graduating School
1. The University of Tokyo
University （Faculty of Engineering ,Deapartment of Mathematical Engineering and Instrumentaion Physics ）
1979 （Graduated ）
Academic Degree
1. Ph.D.
（Thesis） The University of Tokyo
Fundamental engineering
2. Ph.D.
（Thesis） Wessex Institute of Technology, Council for National Academic Awards (U.K.)
Fundamental engineering
3. Master of Engineering
（Coursework） The University of Tokyo
Fundamental engineering
4. Bachelor of Engineering
（Coursework）
Fundamental engineering
Research Employment History 
1981-1993 Resercher, Supervisor, 
　　　　　  Research Manager, Laboratories, 
          NEC Corporation
1993-2000 Associate Professor, 
　　　　　　Department of Mathematical Engineering and 
　　　　　　Information Physics, Faculty of Engineering, 
　　　　　　University of Tokyo
2001- Professor, Mathematical Informatics, 
　　　　　　Foundations of Informatics Research Division, 
　　　　　　National Institute of Informatics
2002- Professor, Department of Informatics, 
　　　　　　School of Mathematical and Physical Science, 
　　　　　　The Graduate University for Advanced Studies
Committee and Board Member History 
Journal of Computational and Applied Mathematics, Associate Editor: 2008-
Computing, Member of the Advisory Board: 2009-
Academic Society Affiliations SIAM(Society for Industrial and Applied Mathematics （Other） , Japan Society for Industrial and Applied Mathematics （Member of the Board of Directors ,2002- ,Japan ） , Infomation Processing Society of Japan （Japan） , Japan Society for Computational Methods in Engineering (JASCOME) （Member of the Steering Committee ,1993- ,Japan ） , Japan Society for Simulation Technology （Japan） , Japan Society for Computational Engineering and Sciences （Japan）

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