1. The George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332 USA
2. Renewable Bioproduct Institute Georgia Institute of Technology Atlanta GA 30332 USA
3. The School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 USA
4. Technology and Development Group Xerox Corporation Webster NY 14580 USA
5. Department of Mechanical Engineering Stanford University Stanford CA 94305 USA