1. Department of Computer Science, Northwestern Polytechnical University, Xi’an, China
2. School of Technology and Innovations, University of Vaasa, Vaasa, Finland
3. Department of Computer Science, Air University, Multan, Pakistan
4. Department of Computer Sciences, COMSATS University Islamabad, Vehari, Pakistan
5. School of Software and Microelectronics, Northwestern Polytechnical University, Xi’an, China