1. Seigo Matsuno:
Dept. of Business Administration, National Institute of Technology, Ube College, Ube, Yamaguchi, Japan
2. Iori Nakaoka:
Dept. of Business Administration, National Institute of Technology, Ube College, Ube, Yamaguchi, Japan
3. Yasuo Uchida:
Dept. of Business Administration, National Institute of Technology, Ube College, Ube, Yamaguchi, Japan
4. Tsutomu Ito:
Dept. of Business Administration, National Institute of Technology, Ube College, Ube, Yamaguchi, Japan
5. Takao Ito:
Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan