1. School of Electrical Engineering, Yanshan University, Qinhuangdao, China
2. School of computer and science, South-Central Minzu University, Wuhan, China
3. School of Computer Science and Engineering, Energy Research Institute at NTU, Interdisciplinary Graduate Program, Nanyang Technological University, Singapore
4. School of Automation, Guangdong University of Technology, Guangzhou, China
5. School of Computer Science and Engineering, Nanyang Technological University, Singapore