1. Department of Applied Electronics, Tokyo University of Science, Katsushika-ku, Tokyo 125-8585, Japan
2. Department of Nuclear Engineering and Management, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
3. Department of General Education, Osaka Institute of Technology, Asahi-ku, Osaka 535-8585, Japan
4. College of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
5. Union Materials Inc., Tone, Ibaraki 300-1640, Japan