1. Western Region Industrial Research Center, Hiroshima Prefectural Technology Research Institute, Hiroshima, Japan
2. Osaka Kyoiku University, Osaka, Japan
3. Department of Advanced Science and Engineering, Hiroshima University, Hiroshima, Japan
4. Department of Mechanical Engineering, Keio University, Yokohama, Japan
5. Institute of Engineering, Hiroshima University, Hiroshima, Japan