1. Department of Machine Intelligence and Systems Engineering, Faculty of Systems Science and Technology; Akita Prefectural University; 84-4 Tsuchiya-Ebinokuchi; Yurihonjo; Akita; 015-0055; Japan
2. Department of Mechanical Systems Engineering, Faculty of Engineering; Toyama Prefectural University; 5180 Kurokawa; Imizu; Toyama; 939-0398; Japan