1. Computer Science Department, Baylor University, Waco, TX, USA
2. Department of Information Science and Technology, Pennsylvania State University, Abington, PA, USA
3. Department of Mathematics and Computer Science, Nicholls State University, Thibodaux, LA, USA
4. College of Intelligent System Engineering, Sun Yat-sen University, Guangzhou, China
5. Department of Computer Science, Massachusetts College of Liberal Arts, North Adams, MA, USA
6. College of Communication and Information, University of Kentucky, Lexington, KY, USA