1. Research Assistant, Dept. of Geotechnical Engineering, Tongji Univ., Shanghai 200092, P.R. China; Currently, Research Scholar, Dept. of Civil Engineering, Case Western Reserve Univ., Bingham Bldg Room 203D, 2104 Adelbert Rd., Cleveland, OH 44106.
2. Dept. of Civil Engineering, Courtesy with Depts. of EECS, MAE, Case Western Reserve Univ., 2104 Adelbert Rd., Bingham Building Room 206, Cleveland, OH 44106.
3. Dept. of Geotechnical Engineering, Tongji Univ., Shanghai 200092, P.R. China.