1. Software Development Department, Controller Division, Product Business Division H.Q., Industrial Automation Company, Omron Corporation, Shimogyo-ku, Kyoto, Japan
2. Graduate School of Science and Engineering, Yamaguchi University, Ube, Yamaguchi, Japan
3. Department of Mechanical Engineering and Science, Kyoto University, Kyodai-katsura, Nishikyo-ku, Kyoto, Japan