Recognition of Distorted Patterns Using the Viterbi Algorithm. - Hatsukazu Tanaka; Yutaka Hirakawa; Seiko Kaneku (IEEE Trans. Pattern Anal. Mach. Intell., 1982)

An automaton decomposition method for program structure simplification. - Yutaka Hirakawa; Keiji Okada (Syst. Comput. Jpn., 1985)

Hypermedia as a Communication Design Software Support. - Yutaka Hirakawa; Shuichi Uchida; Michihiro Monden (UK Hypertext, 1989)

Comments on "On the Projection Method for Protocol Verification''. - Yutaka Hirakawa (IEEE Trans. Software Eng., 1990)

A design method for communications software evolution. - Hironobu Okuyama; Kenji Moriyasu; Yutaka Hirakawa (ICNP, 1994)

Improvement of Visual Customer Relationship Management System. - Tetsuo Hidaka; Tetsushi Morita; Tomohiko Nakamura; Morihide Oinuma; Yutaka Hirakawa (IRI, 2004)

Visualization Methods Using Three-Dimensional Space for Auctions. - Tetsushi Morita; Mitsuhiro Yuitou; Tetsuo Hidaka; Yutaka Hirakawa (SAINT Workshops, 2005)

The utilization method of idle PC resources. - Yutaka Hirakawa; Yoshifumi Matsuda (IUCS, 2009)

Pass-Image Authentication Method Tolerant to Video-Recording Attacks. - Yutaka Hirakawa; Hiroyuki Take; Kazuo Ohzeki (FedCSIS, 2011)

A New Watermarking Method with Obfuscated Quasi-Chirp Transform. - Kazuo Ohzeki; Yuanyu Wei; Yutaka Hirakawa; Kiyotsugu Sato (IWDW, 2011)

Consideration of the Watermark Inversion Attack and Its Invalidation Framework. - Kazuo Ohzeki; Yuanyu Wei; Yutaka Hirakawa; Kiyotsugu Sato (IWDW, 2012)

Pass-Image Authentication Method Tolerant to Random and Video-Recording Attacks. - Yutaka Hirakawa; Motohiro Take; Kazuo Ohzeki (Int. J. Comput. Sci. Appl., 2012)

Robust watermark against double attacks of compression and cropping. - Masahiro Takatsuka; Masaaki Kajihara; Yutaka Hirakawa; Kazuo Ohzeki (GCCE, 2014)

Authentication System Using Encrypted Discrete Biometrics Data. - Kazuo Ohzeki; Yuanyu Wei; Masaaki Kajihara; Masahiro Takatsuka; Yutaka Hirakawa; Toru Sugimoto (TRUST, 2014)

Minimum variance method to obtain the best shot in video for face recognition. - Kazuo Ohzeki; Ryota Aoyama; Yutaka Hirakawa (FedCSIS, 2015)

Minimum Variance Method to Obtain the Best Shot in Video and its Effectiveness for Face Recognition. - Kazuo Ohzeki; Ryota Aoyama; Yutaka Hirakawa (Int. J. Comput. Sci. Appl., 2016)