1. Mechanical Engineering Department, The University of Texas at Austin, 204 E Dean Keeton St, Stop C2200, Austin, TX 78712
2. Department of Mechanical Engineering, Science & Engineering Group II Building, University of Massachusetts Dartmouth, North Dartmouth, MA 02747-2300
3. Mechanical Engineering Department, The University of Texas at Austin, 204 E Dean Keeton St, Stop C2200, Austin, TX 78712 e-mail:
4. Engineering Product Development, Singapore University of Technology and Design, 20 Dover Drive, Singapore 138682