1. Senior Researcher, Mechanical Systems Development Dept., Korea Atomic Energy Research Institute, Daejeon 305-600, Korea.
2. Senior Researcher, Ocean Development System Research Division, Korea Research Institute of Ships & Ocean Engineering, Yuseong, PO Box 23, Daejeon 305-600, Korea.
3. Professor, Dept. of Civil Engineering, Kyungil Univ., Kyungsan 712-701, Korea.
4. Professor, Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.