[1] Dept. of Mechanical Engineering, Shizuoka University, 3-5-1 Johoku Hamatsu, Shizuoka,432-8561, Japan
[2] Nagoya Machinery Works, Mitsubishi Heavy Industries Ltd, Takamich-1, Iwatsuka-cho, Nagoya, Nakamura-ku,453-8515, Japan
[3] Dept. of Machine Intelligence and Systems Eng, Aramaki-Aoba, Sendai, Aobaku,980-8579, Japan
[4] Center for Cooperative Research in Advanced Science and Technology, Furou-cho, Chigusa-ku, Nagoya,464-8603, Japan