Sunada S. 1, Wang H. 2 , Zeng Lijiang 2, Kawachi K. 3
1. Department of Aerospace Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan 2. Department of Precision Instruments, Tsinghua University, Beijing 100084, P.R.China 3. Department of Aeronautics and Astronautics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan