1. Department of Computer Science, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokoham, Kanagawa 226-8502, Japan
2. Department of Intelligent and Control Systems, Kyushu Institute of Technology, 680-4 Kawazu, IIzuka, Fukuoka 820-8502, Japan
3. Living Systems Materialogy (LiSM) Research Group, International Research Frontiers Initiative (IRFI), Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan