Affiliations: Department of Mechanical Engineering, Kogakuin
University, 2665 Nakano-machi, Hachioji, Tokyo, 192-0015 Japan. E-mail:
iida@fluid.mech.kogakuin.ac.jp | Institute of Industrial Science, University of Tokyo,
4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505 Japan