1. Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-857, Japan. Tel.: +81 22 217 5264; Fax: +81 22 217 5264; E-mail: qiu@ifs.tohoku.ac.jp
2. Honda R&D Co., Ltd., Tochigi R&D Center, Haga-gun, Tochigi 321-3393, Japan
3. Platform Products, I/CD, Teradyne, Inc., 179 Lincoln St., MS-L21, Boston, MA 02111, USA