1. G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332 e-mail: david.rosen@me.gatech.edu
2. Department of Mechanical Engineering, University of Texas at Austin, Austin, TX 78705 e-mail: ccseepersad@mail.utexas.edu
3. Department of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA 16802 e-mail: tws8@psu.edu
4. Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061 e-mail: cbwilliams@vt.edu