1. Department of Media Informatics, Ryukoku University, Shiga 520-2194, Japan
2. JSPS Research Fellow and Graduate School of Sociology, Toyo University, Tokyo 112-8506, Japan
3. ATR Intelligent Robotics and Communication Laboratories, Kyoto 619-0288, Japan
4. Department of Computer Education, Cheongju National University of Education, Chungbuk 361-712, Korea
5. Department of Education, Dongguk University, Seoul 100-715, Korea
6. Institute for Safety Security Rescue Technology, University of South Florida, Tampa FL 33620, USA
7. Department of Clinical Welfare, Kyushu Universtiy of Health and Welfare, Miyazaki 882-8508, Japan