1. School of Mechanical and Materials Engineering, Washington State University, P.O. Box 642920, Pullman, WA 99164-2920
2. Systems Realization Laboratory, G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332
3. Systems Realization Laboratory, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 210 Technology Circle, Savannah, GA 31407