日本語
The University of Electro-Communications 
Graduate School of Informatics and Engineering, School of Informatics and Engineering 
"Department of Computer and Network Engineering, Cluster I (Informatics and Computer Engineering)" 

Professor 
Yusaku YAMAMOTO 

Classes responsible within the university
2019  応用数学第二  Spring semester  Undergraduate, daytime 
2019  ハイパフォーマンスコンピューティング  Fall semester  Undergraduate, daytime 
2019  ハイパフォーマンスコンピューティング基礎論  Fall semester  Graduate, IE  Master's program 
2019  情報数理工学実験第二  Fall semester  Undergraduate, daytime 
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Current research areas
Computational science 

Published books
Book  計算科学のための基本数理アルゴリズム  山本有作,曽我部知広  共立出版  2019/06/01  978-4-320-12266-6 
Book  数値線形代数の数理とHPC (シリーズ応用数理 第 6巻)  山本 有作  共立出版  1-31  2018/08/30  978-4320019553 
Book  Eigenvalue Problems: Algorithms, Software and Applications in Petascale Computing  Yusaku Yamamoto  Springer  251-266  2018/01/04  978-3319624242 
Book  計算科学のためのHPC技術1  片桐孝洋,中田真秀,渡辺宙志,山本有作,吉井範行,Jaewoon Jung,杉田有治,石村和也,大石進一,関根晃太,森倉悠介,黒田久泰  大阪大学出版会  2017/03/01  978-4-87259-586-4 
Book, translated  Computational Science & Engineering  Gilbert Strang  近代科学社  2017/01/30 
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Published papers
Paper  Yes  Fixed-point analysis of Ogita-Aishima’s symmetric eigendecomposition refinement algorithm for multiple eigenvalues  Joint  K. Shiroma and Y. Yamamoto  JSIAM Letters  0/ 0, 0-0  2020/06/01 
Paper  Yes  Shifted CholeskyQR for computing the QR factorization of ill-conditioned matrices  Joint  T. Fukaya, R. Kannan, Y. Nakatsukasa, Y. Yamamoto and Y. Yanagisawa  SIAM Journal on Scientific Computing  0/ 0, 0-0  2020/06/01 
Paper  Yes  Asymptotic Quadratic Convergence of the Two-Sided Serial and Parallel Block-Jacobi SVD Algorithm  Joint  Gabriel Oksa, Yusaku Yamamoto, Martin Becka, and Marian Vajtersic  SIAM Journal on Matrix Analysis and Applications  40/ 2, 639-671  2019/05/23  https://doi.org/10.1137/18M1222727 
Paper  Yes  EigenKernel: A middleware for parallel generalized eigenvalue solvers to attain high scalability and usability  Joint  Kazuyuki Tanaka, Hiroto Imachi, Tomoya Fukumoto, Akiyoshi Kuwata, Yuki Harada, Takeshi Fukaya, Yusaku Yamamoto and Takeo Hoshi  Japan Journal of Industrial and Applied Mathematics  36/ 2, 719-742  2019/04/29 
Paper  Yes  Efficient implementations of the modified Gram–Schmidt orthogonalization with a non-standard inner product  Joint  Akira Imakura and Yusaku Yamamoto  Japan Journal of Industrial and Applied Mathematics  36/ 2, 619-641  2019/04/29 
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Research presentations
Oral presentation for an academic conference  Shifted CholeskyQR3 for High Performance Tall-Skinny QR Factorization  2020 SIAM Conference on Parallel Processing for Scientific Computing  0/ 0  No  Takeshi Fukaya, Ramaseshan Kannan, Yuji Nakatsukasa, Yusaku Yamamoto and Yuka Yanagisawa  2020/02/13 
Oral presentation for an academic conference  Performance improvement of block red-black MILU(0) preconditioner with relaxation on GPU  HPC Asia 2020  0/ 0  No  Akemi Shioya and Yusaku Yamamoto  2020/01/16 
Oral presentation for an academic conference  エネルギー散逸型数値解法の 設計におけるある逆固有値問題について  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28回研究会  0/ 0  No  山本 有作  2019/12/02 
Oral presentation for an academic conference  Efficient implementations of the modified Gram–Schmidt orthogonalization in a non-standard inner product  PARNUM 2019  1/ 1  Yes  Yusaku Yamamoto  2019/10/28 
Oral presentation for an academic conference  離散相対論的戸田方程式が与えるシフト付きLR変換について  日本応用数理学会2019年度年会  1/ 1  No  簑下尚也,岩崎雅史,山本有作  2019/09/05 
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