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  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  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 
Paper  Yes  Roundoff error analysis of the CholeskyQR2 algorithm in an oblique inner product  Joint  Y. Yamamoto, Y. Nakatsukasa, Y. Yanagisawa and T. Fukaya  JSIAM Letters  8, 5-8  2016 
Paper  Yes  Asymptotic quadratic convergence of the serial block-Jacobi EVD algorithm for Hermitian matrices  Joint  Gabriel Oksa, Yusaku Yamamoto and Marian Vajtersic  Numerische Mathematik  1-25  2016/12/24  10.1007/s00211-016-0863-5 
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Research presentations
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 
Oral presentation for an academic conference  一般内積における直交化のためのMGS-HP 法の誤差解析  第46回数値解析シンポジウム(NAS2017)  1/ 1  No  山本有作  2017/06/30 
Oral presentation for an academic conference  Roundoff error analysis of the CholeskyQR2 and related algorithms  International Workshop on Parallel Numerics (PARNUM 2017)  0/ 0  Yes  Yusaku Yamamoto  2017/04/20 
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