1. Staff Engineer, Golder Associates Inc., Irvine, CA 92602.
2. Research Assistant, Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634.
3. Professor, Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634 (corresponding author).formerly, Chair Professor, Dept. of Civil Engineering, National Central Univ., Jungli, Taiwan.
4. Assistant Research Fellow, Sustainable Environment Research Center, National Cheng Kung Univ., Taiwan 70944.