1. Corresponding author. Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering, Changsha University of Science and Technology, Changsha, Hunan 410114, China ().
2. Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering, Changsha University of Science and Technology, Changsha, Hunan 410114, China.
3. Department of Mathematics and Statistics, University of New Brunswick, Fredericton E3B 5A3, NB, Canada ().