Affiliations: School of Engineering, the University of Tokyo, 5-1-5
Kashiwanoha, Kashiwa, Chiba, 277-8568, Japan. E-mail:
[email protected] | Research into Artifacts, Center for Engineering
(RACE), the University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8568,
Japan