1. a Cannon Research Center , 4009 Miranda Avenue, Palo Alio, CA, 94304, U.S.A
2. b Department of Electrical Engineering , The Ohio State University , Columbus, OH, 43210, U.S.A
3. c ELD, Ford Motor Company , 17000 Rotunda Drive, Dearborn, MI, 48121-6010, U.S.A.