1. Geotechnical Specialist, Civil & Architectural Dept. 1, Samsung Engineering, 467-14, Samsung SEI Tower, Dogok-2 Dong, Gangnam-Gu, Seoul, 135-856, Korea; formerly Post-doctoral Researcher, School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907-1284 (corresponding author).
2. Professor, School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907-1284.
3. Geotechnical Field Operation Supervisor, Office of Geotechnical Engineering, Indiana Dept. of Transportation, 120 S. Shortridge Rd., Indianapolis, IN 46219-0389.
4. Assistant Professor, Dept. of Civil Engineering, Chosun Univ., 375 Seosuk-Dong, Dong-Gu, Gwangju, 501-759, Korea.