1. Building Department, National Institute for Land and Infrastructure Management, 1 Tachihara, Tsukuba 305-0802, Japan;.
2. Nippon Steel Corporation, 6-3 Otemachi 2-Chome Chiyoda-ku, Tokyo 100-8071, Japan;.
3. RWConsulting Group P.O.Box 1216, Bethlehem, PA 18016-1216;.