Civil and Environmental Engineering Department;
Seoul National University;
Seoul;
Republic of Korea Research Fellow;
Water Resources and Director of Hydroscience and Training Center;
Civil and Environmental Engineering Department;
Colorado State University;
Fort Collins;
CO;
USA;
80526 Borland Professor;
U.S.Army Corps of Engineers;
Omaha;
Nebraska;
USA Hydraulic Engineer;
Sedimentation and Channel Stabilization Section;
U.S.Army Corps of Engineers;
Omaha;
Nebraska;
USA Chief;
Hydrologic Engineering Branch;
Omaha;
Nebraska;
USA Chief;