1. School of Computer Science and Technology, Shandong Technology and Business University, Yantai, China
2. Fujian Provincial Key Laboratory of Information Processing and Intelligent Control, College of Computer and Control Engineering, Minjiang University, Fuzhou, China
3. Department of Bioengineering, Lehigh University, Bethlehem, PA, USA
4. College of Information Science and Technology, Nanjing Forestry University, Nanjing, China