Authors
Xing Haihua
College of Information Science and Technology, Beijing Normal University, Beijing, China
College of Information Science and Technology, Hainan Normal University, Haikou, China
Yu Xianchuan
College of Information Science and Technology, Beijing Normal University, Beijing, China
Hu Dan
College of Information Science and Technology, Beijing Normal University, Beijing, China
Dai Sha
College of Information Science and Technology, Beijing Normal University, Beijing, China