1. Institute of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
2. Henan Key Laboratory of Big Data Analysis and Processing, Institute of Data and Knowledge Engineering, School of Computer and Information Engineering, Henan University, Kaifeng, China
3. Department of Computer Science and Information Engineering, Asia University, Taichung, China
4. Cyberspace Institute of Advanced Technology, Guangzhou University, Guangzhou, China