1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin, China
2. School of Economics and Management, Hebei University of Technology, Tianjin, China
3. Institute of Computer Science, Warsaw University of Technology, Warsaw, Poland
4. Discipline of Mathematics, Indian Institute of Technology Indore, Simrol, India
5. Department of Computer Science and Engineering, National Institute of Technology Patna, Patna, India
6. Uppsala University, Uppsala, Sweden