1. Assistant Professor, Dept. of Information Management, Ling-Tung Univ., 408, Taiwan (corresponding author).
2. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Houston, Houston, TX 77204-4003.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Houston, Houston, TX 77204-4003.
4. Associate Professor, Dept. of Hydraulics and Ocean Engineering, National Cheng Kung Univ., Tainan 70101, Taiwan.