中文摘要：

Jinghui Zhang received the BS degree fiom Southeast University in 2005, and the PhD degree in computer science fi＇om Southeast University in 2014. He is a lecturer in School of Computer Science and Engi,mering. Southeast University. China. His current research interests include cloud computing, geo-distribuieddata management, and distributed computing. He is a member of the ACM and CCEE-mail： jhzhang@seu.edu.cn. Jian Chen received the BS degree from Soochow University in 2014. He is currently working toward the master degree in computer science at Southeast University, China. His reseurch interests include cloud computing and geo-distributed data management.E-mail： jianchen@seu.edu.cn; Junzhou Luo received the BS degree in applied mathematics and the MS and PhD degrees in computer network all from Southeast University. China, in 1982, 1992, and 2000, respectively. He is a full professor ill the School of Computer Science and Engineering, Southeast University, Nanjing. China. Hisresearch interests are next generation network architecture, network security, cloud computing, and wireless LAN. He is a member of the IEEE Computer Society and co-chair of IEEE SMC Technical Committee on Computer Supported CooperativeWork in Design, and he is a member of the ACM and chair of ACM Nanjing Chapter.E-mail： jluo@seu.edu.cn; Aibo Song received the MS degree from Shandong University of Science and Technology, and the PhD degree fronl Southeast University, China, in 1996 and 2003, respectively. He is currently an associate professor in the School of Computer Science and Engineering, Southeast University. His current researchinterests include cloud computing and big data processing.E-mail： absong@seu.edu.cn.