Affiliations: Graduate School of Science and Technology, Niigata
University, 8050 Ikarashi-2, Niigata, 950-2181, Japan | Department of Mechanical Engineering, Niigata
University, 8050 Ikarashi-2, Niigata, 950-2181, Japan. E-mail:
fujisawa@eng.niigata-u.ac.jp