1. Department of Civil and Environmental Engineering, Nanya Institute of Technology, 414, Sec. 3, Chung-Shang E. Rd., Jungli, Taoyuan 320, Taiwan, Republic of China. Phone: 886-3-4361070 ext. 5141, 3303; Fax: 886-3-4563674; E-mail: chchen@nanya.edu.tw
2. Department of Civil and Environmental Engineering, Nanya Institute of Technology, Jungli, Taoyuan County, Taiwan, Republic of China