1. Faculty of Computer Science and Systems Engineering, Okayama Prefectural University, Soja, Okayama, Japan
2. Faculty of Economics, Toyo University, Bunkyo-ku, Tokyo, JAPAN
3. Faculty of Nutritional Sciences, Nakamura Gakuen University, Fukuoka, Fukuoka, JAPAN
4. College of Engineering, Shibaura Institute of Technology, Saitama, Saitama, JAPAN