1. School of Mathematics and Statistics Science, Ludong University, Yantai, China
2. Marine College, Zhejiang Ocean University, Zhoushan, China
3. School of Navigation, Hubei Key Laboratory of Inland Shipping Technology, Wuhan University of Technology, Wuhan, China
4. Faculty of Mechanical Engineering, Opole University of Technology, Opole, Poland
5. Department of Computer Science and Media Technology, Malmo University, Malmö, Sweden
6. Department of Computer Engineering, University of Alcalá, Alcalá de Henares, Spain