1. Professor, Dept. of Civil Engineering, National Chung Hsing Univ., Taichung 402, Taiwan (corresponding author).
2. Associate Professor, Dept. of Tourism, Restaurant, and Hotel Management, Kainan Univ., Taoyuan 338, Taiwan.
3. Master, Dept. of Civil Engineering, National Chung Hsing Univ., Taichung 402, Taiwan.