1. School of Navigation and Shipping, Shandong Jiaotong University, Weihai, China
2. School of Information Science and Engineering and the Shandong Provincial Key Laboratory for Novel Distributed Computer Software Technology, Shandong Normal University, Jinan, China
3. School of Information Science and Engineering, Harbin Institute of Technology, Weihai, China
4. Institute of Frontier and Interdisciplinary Science and the Key Laboratory of Particle Physics and Particle Irradiation, Shandong University, Qingdao, China