1. Department of Human Information Engineering, Faculty of Computer Science and Systems Engineering, Okayama Prefectural University, Souzya-shi, Okayama, Japan
2. Department of Industrial and Systems Engineering, College of Science and Technology, Aoyama Gakuin University, Chuo-ku, Sagamihara-shi, Kanagawa, Japan
3. Department of Advanced Science, Faculty of Science and Technology, Hosei University, Kajinocho, Koganei, Tokyo, Japan