1. School of Computer Science and Technology, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
2. School of Computer Science and Technology, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China, and also with the Shandong Laboratory of Computer Networks, Jinan 250014, China (e-mail: jin445118@163.com)
3. Institute of Complexity Science, Qingdao University, Qingdao 266071, China.
4. Discipline of Engineering and Energy, Murdoch University, Murdoch, WA 6150, Australia.