1. Department of Vehicle Engineering; Center for Condensed Matter Sciences; National Taipei University of Technology; National Taiwan University; Taipei 10617 Taiwan
2. Department of Vehicle Engineering; National Taipei University of Technology; Taipei 10617 Taiwan
3. Department of Energy and Refrigerating Air-Conditioning Engineering; National Taipei University of Technology; Taipei 10617 Taiwan
4. Department of Information and Electronic; Beijing Institute of Technology; Beijing 100081 China