1. Department of Human and Information Systems, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
2. Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa, Nagoya, Aichi 466-8555, Japan
3. Department of System Engineering of Human Body, Chukyo University, 101 Tokodachi, Kaizu-cho, Toyota-shi, Aichi 470-0393, Japan