1. a Energy Research Group and Institute of Traffic and Transportation National Chiao Tung University , Taipei, Taiwan, Republic of China
2. b Department of Traffic and Transportation, Engineering and Management , Feng Chia University , Taichung, Taiwan, Republic of China
3. c Department of Industrial Management , Huafan College of Humanity and Technology , Shihtin Hsiang, Taipei Hsien, Taiwan, Republic of China