1. Assistant Director, Cost and Construction Management Division, Office of Subway Construction, Seoul Metropolitan Government, Seoul, Korea 100-813; formerly, Graduate Research Assistant, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907.
2. Assistant Professor, School of Civil and Environmental Engineering, Oklahoma State Univ., Stillwater, OK 74078; formerly, Graduate Research Assistant, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907.
3. Professor, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907.