1. School of Automation and Electronic Information, Xiangtan University,xiangtan,China,411100
2. School of Electrical and Electronic Engineering, Universiti Sains Malaysia (USM),Penang,Malaysia,11800
3. School of Computer Sciences, Universiti Sains Malaysia (USM),Penang,Malaysia,11800
4. Institute of Power Engineering, College of Engineering, Universiti Tenaga Nasional (UNITEN),Kajang,Malaysia,43000