1. Guangxi Key Laboratory of Trusted Software, School of Computer and Information Security, Guilin University of Electronic Technology, Guilin, China
2. School of Computer Science and Technology, Zhoukou Normal University, Zhoukou, China
3. Key Laboratory of Knowledge Engineering with Big Data, Ministry of Education, the School of Computer Science and Information Engineering, the Anhui Province Key Laboratory of Industry Safety and Emergency Technology, and the Intelligent Interconnected Systems Laboratory of Anhui Province, Hefei University of Technology, Hefei, China
4. School of Software Technology, Dalian University of Technology, Dalian, China