1. Professor, Dept. of Architecture, School of Engineering, Univ. of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
2. Lecturer, Dept. of Architecture, School of Engineering, Univ. of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
3. Chief Official, Ministry of Land, Infrastructure, and Transport, 2-1-3 Kasumigaseki, Chiyoda-ku, Tokyo 100-8918, Japan.