Yange Sun1,2, Zhihai Wang2, Jidong Yuan2, and Wei Zhang2 1School of Computer and Information Technology, Xinyang Normal University, China 2School of Computer and Information Technology, Beijing Jiaotong University, China
Ye-feng Li1, Jia-jin Le2, and Mei Wang2 1College of Computer Science and Technology, Beijing University of Technology, China 2College of Computer Science and Technology, Donghua University, China