1. National Institute of Technology, Yonago College, 4448 Hikona-cho, Yonago, Tottori 683-8502, Japan
2. School of Engineering, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
3. ALMADO Inc., 3-6-18 Kyobashi, Chuo-ku, Tokyo 104-0031, Japan