Hiroshi Iwai
Department of Mechanical Engineering, Department of Aeronautics and Astronautics, Kyoto University, Nishikyo-ku, Kyoto 615-8540, Japan; Kyoto University, Kyoto, 606-8501, JAPAN
Kenjiro Suzuki
Department of Mechanical Engineering, Kyoto University, Kyoto; Department of Machinery and Control Systems, Shibaura Institute of Technology, 307 Fukasaku, Saitama, 337-8570, Japan