Sangjin Ryu1 & Kiyotaka Obunai2 1Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE, USA. 2Department of Mechanical and Systems Engineering, Doshisha University, Kyoto, Japan. Emails: sryu2 (at) unl (dot) edu; kiobunai (at) mail (dot) doshisha (dot) ac (dot) jp Download PDF Robots have been a very popular theme of Japanese animation, or…