1. Department of Mechanical Engineering, University of Hawaii, 2540 Dole Street 302, Honolulu, HI 96822 USA
2. Department of Mechanical Engineering, University of Hawaii, 2540 Dole Street 302, Honolulu, HI 96822 USA,
3. Department of Mechanical Engineering/SMA, IST, Av. Rovisco Pais, 1, 1049-001 Lisbon, Portugal
4. School of Engineering, University of California, Merced, PO Box 2039, Merced, CA 95344 USA