1. College of Electrical Engineering, Sichuan University, Chengdu, China
2. Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC, USA
3. College of Engineering, Temple University, Philadelphia, PA, USA
4. Institute for Software Integrated Systems, Vanderbilt University, Nashville, TN, USA
5. School of Engineering Technology, Purdue University, West Lafayette, IN, USA