1. Department of Architecture; Hiroshima University; 1-4-1 Kagamiyama Higashihiroshima 739-8527 Japan
2. Department of Computer Science; Nihon University; 1 Nakagawara, Tokusada, Tamura Koriyama 963-8642 Japan
3. Hyogo Earthquake Engineering Research Center; National Research Institute for Earth Science and Disaster Prevention; 1501-21 Nishikameyama, Mitsuta, Shijimi Miki 673-0515 Japan
4. Department of System Design Engineering; Keio University; 3-14-1 Hiyoshi, Kohoku Yokohama 223-8522 Japan
5. Takenaka Research & Development Institute; 1-5-1 Ohtsuka Inzai 270-1395 Japan