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
2014  High Performance Computing 2  Spring semester  Undergraduate, daytime  Subject in specialty 
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Current research areas
Computational science 

Published books
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 
Book  応用数理ハンドブック  山本有作  朝倉書店  418-421  2013/10/25 
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Published papers
Paper  Yes  The danger of combining block red–black ordering with modified incomplete factorizations and its remedy by perturbation or relaxation  Joint  Akemi Shioya and Yusaku Yamamoto  Japan Journal of Industrial and Applied Mathematics  35/ 1, 195-216  2018/03  10.1007/s13160-017-0277-5 
Paper  Yes  Solution of a nonlinear eigenvalue problem using signed singular values  Joint  Kouhei Ooi, Yoshinori Mizuno, Tomohiro Sogabe, Yusaku Yamamoto and Shao-Liang Zhang  East Asian Journal on Applied Mathematics  7/ 4, 799-809  2017/11  10.4208/eajam.181016.300517c 
Paper  Yes  On the optimality and sharpness of Laguerre’s lower bound on the smallest eigenvalue of a symmetric positive definite matrix  Only  Y. Yamamoto  Applications of Mathematics  62/ 4, 319-331  2017/08/01 
Paper  Yes  Performance analysis and optimization of the parallel one-sided block Jacobi SVD algorithm with dynamic ordering and variable blocking  Joint  Shuhei Kudo, Yusaku Yamamoto, Martin Becka and Marian Vajtersic  Concurrency and Computation: Practice and Experience  29/ 9  2017/05/10  10.1002/cpe.4059 
Paper  Yes  Probabilistic analysis of an estimator for the Frobenius norm of a matrix product  Joint  Yusaku Yamamoto and Shuhei Kudo  JSIAM Letters  9, 9-12  2017/02/23  10.14495/jsiaml.9.9 
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Research presentations
Oral presentation for an academic conference  Block Red-Black Milu(0) Preconditioner with Relaxation on GPU  18th SIAM Conference on Parallel Processing for Scientific Computing  0/ 0  No  Akemi Shioya and Yusaku Yamamoto  2018/03/09 
Oral presentation for an academic conference  虚数シフトを行った実対称行列のためのCOCG法と一般化MINRES法の性能比較  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24回研究会  0/ 0  No  清藤 博暉, 山本 有作  2017/11/24 
Oral presentation for an academic conference  On using the Cholesky QR method in the full-blocked one-sided Jacobi algorithm  The 12th International Conference on Parallel Processing and Applied Mathematics (PPAM 2017)  0/ 0  Yes  S. Kudo and Y. Yamamoto  2017/09/11  URL 
Oral presentation for an academic conference  ブロック赤-黒順序付けされた摂動/緩和MILU(0)前処理法のGPUとマルチコアCPUにおける性能評価  SWoPP 2017  0/ 0  No  塩谷明美,山本有作  2017/07/27 
Oral presentation for an academic conference  Cholesky QR法を用いたブロック片側ヤコビ法の誤差解析  SWoPP 2017  0/ 0  No  工藤周平,山本有作  2017/07/27 
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