1. School of Science, Guangdong University of Petrochemical Technology, Maoming 525000, China
2. InterNetWorks Research Laboratory, School of Computing, Universiti Utara Malaysia, UUM Sintok 06010, Kedah, Malaysia
3. Department of Computer Engineering, Maoming Polytechnic, Maoming 525000, China
4. College of Computer Science and Software Engineering, Shenzhen University, Shenzhen 518060, China
5. College of Electronics and Information Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China