1. Research and Advanced Engineering Center, Ford Motor Company, Dearborn, MI, USA
2. General Electric Global Research Center, Niskayuna, NY, USA
3. General Motors Propulsion Systems Research, Warren, MI, USA
4. Department of Electrical and Computer Engineering, Utah State University, Logan, UT, USA
5. Smartville Inc., Carlsbad, CA, USA
6. National Renewable Energy Laboratory, Golden, CO, USA