1. Faculty of Information Science and Engineering, Ocean University of China, Qingdao, China
2. College of Engineering, Ocean University of China, Qingdao, China
3. Intelligent Information Sensing and Processing Laboratory, College of Electronic Engineering, Ocean University of China, Qingdao, China
4. College of Computer Science and Technology, Qingdao University, Qingdao, China
5. School of Computer Science, China University of Geosciences, Wuhan, China