1. Senior Researcher, Dam Safety Research Center, Korea Institute of Water and Environment, 462-1, Jeonmin-Dong, Yusung-Gu, Daejon, Korea 305-730.
2. Assistant Professor, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907.
3. Professor, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907.