1. Professor, Dept. of Civil Engineering, Tokai Univ., 1117 Kitakaname, Hiratsuka 259-1292, Japan.
2. General Manager, Railway Engineering, 2-14-2 Nagatacho, Chiyoda, Tokyo, Japan 100-0014.
3. Senior Researcher, Nippon Steel Corporation, Futtsu, Chiba, Japan 113-8656.