The authors are supported by Hunan Provincial Natural Science Foundation of China (2019JJ40004, 2018JJ2006), the Project Supported by Scientific Research Fund of Hunan Provincial Education Department (17A030,16A031), the Project of ”Double First-Class” Applied Characteristic Discipline in Hunan Province (Xiangjiaotong[2018]469), the Project of Hunan Provincial Key Laboratory (2016TP1020) and the Open Fund Project of Hunan Provincial Key Laboratory of Intelligent Information Processing and Application for Hengyang Normal University (IIPA18K05), the training target of the young backbone teachers in Hunan colleges and Universities ([2015]361). ∗ Corresponding author: Zhenguo Luo.