1. Tokyo Electric Power Services Co. Ltd., NO BLDG 8F, 1-1, Uchisaiwai-cho 2-chome, Chiyoda-ku, Tokyo 100, Japan
2. Tokyo Institute of Technology, 4259 Nagatsuda Midori-ku, Yokohama 227, Japan
3. Environmental Planning Laboratory Inc., 29-12-204, Aobadai 1-chome, Megro-ku, Tokyo 153, Japan