1. Department of Mechanical Engineering, Villanova University, Villanova, PA 19085
2. Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan
3. Department of Mechanical Engineering, University of Nevada, Reno, NV 89557
4. Department of Mechanical Engineering, Iowa State University, Ames, IA 50011
5. Department of Mechanical Engineering, University of Washington, Seattle, WA 98195