Affiliation: | Yokosuka Electrical Communication Laboratory, Nippon Telegraph and Telephone Public Corporation, Yokosuka, Kanagawa 238-03, Japan;Department of Management Engineering, Faculty of Engineering, Osaka Electro-Communication University, Neyagawa, Osaka, 572, Japan;Department of Information and Computer Sciences, Faculty of Engineering Science, Osaka University, Toyonaka, Osaka, 560, Japan |