1. Department of Mechanical and Systems Engineering; Ryukoku University; 1-5 Yokotani, Seta Oe-cho Otsu Shiga Japan 520-2194
2. Department of Machine Intelligence and Systems Engineering; Akita Prefectural University; 84-4 Aza-Ebinokuchi, Tsuchiya Yurihonjo Akita Japan 015-0055
3. Department of Human System Interaction; Kwansei Gakuin University; 2-1, Gakuen Sanda Hyogo Japan 669-1337