1. University of Washington, Tacoma,School of Interdisciplinary Arts & Sciences,Tacoma,WA,USA
2. University of Washington, Tacoma,School of Engineering and Technology,Tacoma,WA,USA
3. Federal University of Paraíba,Department of Electrical Engineering,João Pessoa,Brazil
4. University of Washington, Bothell,School of Science, Technology, Engineering & Mathematics,Bothell,WA,USA