1. Department of Computer Science, College of Engineering; Nihon University; 1 Nakagawara, Tokusada, Tamura Koriyama 963-8642 Japan
2. Hyogo Earthquake Engineering Research Center; National Research Institute for Earth Science and Disaster Prevention; 1501-21 Nishikameyama, Mitsuta, Shijimi Miki 673-0515 Japan
3. Allied Engineering Corporation; Toyosu Front, 3-2-20 Toyosu, Koto-ku Tokyo 135-0061 Japan
4. Department of Architecture; Hiroshima University; 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan