1. Grad. Sch. of Science and Engineering, Kindai University, Kowakae, Higashi-Osaka, Japan
2. Sch. of Science and Engineering, Kindai University, Kowakae, Higashi-Osaka, Japan
3. Faculty of Engineering, Niigata University, Ikarashi 2-no-cho, Nishi-ku, Niigata, Japan