Hideki Okita , Network Systems Department,Central Research Laboratory, Hitachi, Ltd.
Toshiaki Suzuki , Network Systems Department,Central Research Laboratory, Hitachi, Ltd.
Mikio Kataoka , Network Systems Department,Central Research Laboratory, Hitachi, Ltd.
Yong-Sheng He , Dalian Maritime University, 116026 Dalian, P.R. China.
Sergei Semenov , Nokia Technology Platforms, P.O. Box 86, FIN-24101 Salo, Finland.