Authors
Liu Xin
College of Information Science and Engineering Ocean University of China, Qingdao, China
Wei Zhiqiang
College of Information Science and Engineering Ocean University of China, Qingdao, China
© 2019 Liu Xin, Wei Zhiqiang, published by Xi’an Technological University
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.