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Dive into the research topics where Kenichi Utsumi is active.

Publication


Featured researches published by Kenichi Utsumi.


Optical Storage Technology and Applications | 1988

Erasable Phase Change Optical Disk Using A SeInSb Alloy Film For High-Density Recording

Kenichi Utsumi; Yasuyuki Goto; Iwao Tsugawa; Tetsuya Yuasa; Nagaaki Koshino; Seiya Ogawa

High-density recording using a SeInSb alloy film is now possible. Recordings with mark lengths as small as 0.8-0.9 μm yield good quality signals. This medium also demonstrates good performance, as evidenced by its long-term stability and a high number of write-erase cycles. It is also clear that the avoidance of waveform distortion is essential for the high-density recording of actual signals.


Archive | 1993

Character string retrieval system using index and unit for making the index

Masahiro Nakada; Kenichi Utsumi; Takashi Tsubokura; Masaru Nakahara; Satoshi Itami; Hiroshi Suzuki; Kyouko Miyabe; Satoshi Komura


Archive | 1996

Security system for protecting information stored in portable storage media

Satoshi Kataoka; Makoto Yoshioka; Kenichi Utsumi; Keiichi Murakami


Archive | 1993

Unauthorized use prevention method for optical disks, optical disk having unauthorized use prevention function, and optical disk apparatus

Satoshi Itami; Kenichi Utsumi; Masahiro Nakada; Hiroshi Suzuki; Kazunori Naito; Kazuo Nakashima; Toshikatsu Narumi; Masaru Nakahara


Archive | 1998

License devolution apparatus

Kenichi Utsumi; Hideyuki Hirano; Seigo Kotani


Archive | 1996

Security system for protecting information stored in storage media

Kenichi Utsumi; Satoshi Kataoka; Keiichi Murakami; Makoto Yoshioka


Archive | 1995

Transformation pattern generating device and encryption function device

Ryota Akiyama; Naoya Torii; Noboru Iwayama; Kenichi Utsumi


Archive | 1995

File management system for a partially rewritable storage medium where file management information is created in a rewritable zone based on medium management information in a read only zone

Yoshiaki Uchida; Kenichi Utsumi; Masahiro Nakada


Archive | 1992

Write control method and apparatus for writing optical disk data

Seiichi Iwasa; Nagaaki Koshino; Kenichi Utsumi; Masahiro Nakada


Archive | 1995

System for decrypting encrypted software

Kazuo Nakashima; Masaru Nakahara; Satoshi Itami; Kenichi Utsumi

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