An implantable power supply with an optically rechargeable lithium battery. - Kazuya Goto; Tetsuya Nakagawa; Osamu Nakamura; Satoshi Kawata (IEEE Trans. Biomed. Eng., 2001)

Cryptographic alias e-mail addresses for privacy enforcement in business outsourcing. - Masahisa Kawashima; Tsuyoshi Abe; Satoshi Minamoto; Tetsuya Nakagawa (Digital Identity Management, 2005)