1. School of Electrical Engineering and AutomationAnhui UniversityHefei230601People's Republic of China
2. School of Electrical and Computer EngineeringRoyal Melbourne Institute of Technology UniversityMelbourne3000Australia
3. Faculty of Science, Engineering and TechnologySwinburne University of TechnologyMelbourne3122Australia
4. School of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore518000