[1] Michigan Technological University, Dept. of Electrical Engineering, Houghton, MI, United States
[2] University of Colorado, Department of Mechanical Engineering, Boulder, CO, United States
[3] Mission Research Corp., Dayton, OH, United States
[4] Air Force Institute of Technology, Dept. of Elec. and Comp. Engineering, Wright-Patterson AFB, Dayton, OH, United States