1. China University of Geosciences (Wuhan), School of Mathematics and Physics, Wuhan, China.
2. China University of Geosciences (Wuhan), School of Mathematics and Physics, Wuhan, China. (corresponding author)
3. Hainan Medical University, College of Biomedical Information and Engineering, Haikou, China.
4. Central China Normal University, Department of Computer Science, Wuhan, China.