1. Department of Information and Communication Engineering, Fukuoka Institute of Technology (FIT),
Wajiro-Higashi, Higashi-ku, Fukuoka, Japan
2. Graduate School of Engineering, Fukuoka Institute of Technology (FIT), Wajiro-Higashi,
Higashi-ku, Fukuoka, Japan
3. Department of Computer Science, Louisiana State University, Baton Rouge, LA, USA
4. Department of Informatics, Yamagata University, Jonan, Yonezawa, Yamagata, Japan