1. Research Fellow of Japan Society for the Promotion of Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
2. Division of Liberal Arts, Center for Promotion of Higher Education, Kogakuin University, 2665-1 Nakano-machi, Hachioji, Tokyo 192-0015, Japan
3. Graduate School of Engineering, Course of Mechanical Engineering, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan