1. Assistant Professor, Dept. of Marine and Mechanical Engineering, Naval Academy, 669 Junxiao Rd., Zuoying District, Kaohsiung 813, Taiwan.
2. Graduate Research Assistant, Dept. of Civil Engineering, Sustainable Environment Research Center, National Cheng Kung Univ., 1 University Rd., Tainan 701, Taiwan.
3. Professor, Dept. of Civil Engineering, Sustainable Environment Research Center, National Cheng Kung Univ., 1 University Rd., Tainan 701, Taiwan (corresponding author).