1. Associate Professor Department of Mechanical and Production Engineering, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181Japan e-mail:
2. Lecturer Member of ASME Department of Mechanical Engineering and Informatics, Meiji University, 1-1-1 Higashimita, Tama-ku, Kawasaki 214-8571Japan e-mail:
3. Technical Advisor Member of ASME Sanwa Tekki Corporation, 2703 Nakaokamoto-cho, Utsunomiya 329-1192, Japan e-mail: