Affiliation: | 1. Mitsuhiro Kojina is Assistant Lecturer and of the University of Electro-Communications, Department of Industrial Engineering and Management, 1-5-1, Chofugaoka, Chofu-shi, Tokyo, Japan;7. Junichiro Hoken is a member of the Technical Staff of the University of Electro-Communications, Department of Industrial Engineering and Management, 1-5-1, Chofugaoka, Chofu-shi, Tokyo, Japan;71. Masaru Saito is Professor of Chuo University, Faculty of Economics, Tokyo, Japan |