1. Department of Electrical, Computer, and Systems Engineering, Case Western Reserve University, Cleveland, OH, USA
2. Department of Computer Science, Virginia Commonwealth University, Richmond, VA, USA
3. School of Information Science and Engineering, Yunnan University, Kunming, China
4. Department of Computer and Information Sciences, Towson University, Towson, MD, USA
5. School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, China
6. Department of Electrical Engineering, Tuskegee University, Tuskegee, AL, USA