Kenichi Yakura

Billing method for information communication networks.

Shinji Kobayashi, Masaaki Yamamoto, Kenichi Yakura, 1999 .

Method for billing for a data transmission network

Shinji Kobayashi, Masaaki Yamamoto, Kenichi Yakura, 1999 .

Charging mechanisms for information transmission networks

Shinji Kobayashi, Masaaki Yamamoto, Kenichi Yakura, 1999 .

Apparatus for managing the transmission of information, mobile terminal device and method for requesting the transmission of information

Hiroshi Uchida, Kenichi Yakura, Kyoko Inoue, 2002 .