1. Min H. Kao, Department of Electrical Engineering and Computer ScienceThe University of TennesseeKnoxvilleTN37996USA
2. College of Electrical Engineering and Information Technology, Sichuan UniversityChengdu610065People's Republic of China
3. Electric Power Board of Chattanooga (EPB)ChattanoogaTN37422USA
4. Oak Ridge National LaboratoryOak RidgeTN37830USA