Web page of Hiroki TOYOKAWA

Ph.D. (Informatics)

Email: toyοkawa -at- amp.i.kyoto-u.ac.jp
Twitter: HToyokawa
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Profile

• Web Application Engineer
• Researcher on High-performance Computing

History

• Mar. 2012 - present: Working for CyberAgent Inc. as an application engineer
• Apr. 2011 - Mar. 2013: Department of Applied Mathematics and Physics, Graduate School of Informatics, Kyoto University (PhD program student)
• Apr. 2010 - Feb. 2012: Working for NS Solutions Corp. as a software developer on financial systems
• Apr. 2008 - Mar. 2010: Department of Applied Mathematics and Physics, Graduate School of Informatics, Kyoto University (Master of Informatics)
• Apr. 2004 - Mar. 2008: School of Information and Mathematical Science, Faculty of Engineering, Kyoto University (Bachelor of Engineering)

Papers

• Hiroki Toyokawa, Hiroyuki Ishigami, Kinji Kimura, Masami Takata and Yoshimasa Nakamura, Accelerating the Reorthogonalization on Singular Vectors with a Multi-Core Processor, High Performance Computing for Computational Science - VECPAR 2012 Lecture Notes in Computer Science, Vol. 7851, pp. 379--390, 2013.
• Hiroki Toyokawa, Kinji Kimura, Yusaku Yamamoto, Masami Takata, Akira Ajisaka and Yoshimasa Nakamura, On Auto-tuned Pre/postprocessing for the Singular Value Decomposition of Dense Square Matrices, IPSJ Transactions on Advanced Computing Systems, Vol. 4, No. 3, pp. 9--21, 2011.
• Hiroki Toyokawa, Kinji Kimura, Yusaku Yamamoto, Masami Takata, Akira Ajisaka and Yoshimasa Nakamura, On Auto-tuned Pre/postprocessing for the Singular Value Decomposition of Dense Square Matrices, IPSJ Symposium Series on High Performance Computing Symposium (HPCS2011), Vol. 2011, pp.97-108, 2011.
• Yumi Saito, Etsu Ra, Satoshi Sasayama, Kuniaki Saito, Hiroki Toyokawa, Effectivenes of Preferable Color Light on Psychosomatic State Evaluated by Emotional Parameters and Bichemical Parameters (in Japanese), Japanese Journal of Complementary and Alternative Medicine, Vol. 7, No. 2, pp.103-111, 2010.
• Hiroki Toyokawa, Yusaku Yamamoto, Kinji Kimura, Masami Takata and Yoshimasa Nakamura, Acceleration of the postprocess in singular value decomposition for dense square matrices using properties of the parallel I-SVD algorithm (in Japanese), IPSJ Transactions on Advanced Computing Systems, Vol. 30, No. 2, pp. 30--38, 2010.
• Hiroki Toyokawa, Yusaku Yamamoto, Kinji Kimura, Masami Takata and Yoshimasa Nakamura, Acceleration of the postprocess in singular value decomposition for dense square matrices using properties of the parallel ISVD algorithm (in Japanese), IPSJ Symposium Series on High Performance Computing Symposium (HPCS2010), Vol. 2010, No. 1, pp. 43–50, 2010.
• Hiroki Toyokawa, Kinji Kimura, Masami Takata and Yoshimasa Nakamura, On parallelism of the I-SVD algorithm with a multi-core processor, JSIAM Letters, Vol. 1, pp. 48--51, 2009.

International Conference

• Hiroki Toyokawa, Hiroyuki Ishigami, Kinji Kimura, Masami Takata and Yoshimasa Nakamura, Accelerating the Reorthogonalization on Singular Vectors with a Multi-Core Processor, The Seventh International Workshop on Automatic Performance Tuning (iWAPT 2012), 2012.
• Hiroki Toyokawa, Kinji Kimura, Masami Takata and Yoshimasa Nakamura, On parallelization of the I-SVD algorithm and its evaluation for clustered singular values, Proceedings of International Conference on Parallel and Distributed Processing Techniques and Application, pp. 711--717, 2009.