1. Graduate School of Informatics, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, JAPAN
2. Kyoto Aquarium, Kankiji-cyo, Shimogyo-ku, Kyoto 600-8835, JAPAN
3. Graduate School of Human and Environmental Studies, Kyoto University, Yoshidanihonmatsu cho, Sakyo-ku, Kyoto 606-8501, JAPAN