Shintaro Takeuchi
Department of Mechanical Engineering,
Osaka University, 2-1 Yamada-oka, Suita-city, Osaka 565-0871 Japan
Yutaka Miyake
Department of Mechanical Engineering, Graduate School of Engineering, Osaka University 2-l,Yamadaoka, Suita, Osaka, 565-0871; Department of Mechanical Engineering Fukui University of Technology 3-6-1, Gakuen, Fuki, 910-8505 Japan
Takeo Kajishima
Department of Mechanical Engineering,
Osaka University, 2-1 Yamada-oka, Suita-city, Osaka 565-0871 Japan