1. Professor, Dept. of Civil and Ecological Engineering, I-Shou Univ., 1, Section 1, Hsueh-Cheng Rd., Ta-Hsu Hsiang, Kaohsiung County, Taiwan 84008, R.O.C.
2. Associate Professor, Dept. of Civil Engineering, National Kaohsiung Univ. of Applied Sciences, 415 Chien Kung Rd., Kaohsiung, Taiwan 80778, R.O.C.
3. Assistant Professor, Dept. of Environmental and Saftey Engineering, Mingchi University of Technology, 84 Gungjuan Rd., Taishan, Taipei, Taiwan, 243, R.O.C.