1. Graduate School of Electrical Engineering and Electronics, Kanazawa Institute of Technology, Nonoichi, Japan
2. Mitsubishi Electric Information Network Corporation, Tokyo, Japan
3. Department of Electrical and Electronic Engineering, College of Engineering, Kanazawa Institute of Technology, Nonoichi, Japan
4. Department of Information and Computer Science, College of Engineering, Kanazawa Institute of Technology, Hakusan-shi, Japan