中文摘要：

E-mail：kouyue@ise.neu.edu.cn Yue Kou is a lecturer at College of Information Science and Engineering, Northeastern University. She received her Ph.D. degree in computer software and theory from Northeast- ern University of China in 2009. She is a student member of CCF. Her main research interests include Web data management and information retrieval. E-mail： shenderong @ise.neu.edu.cn De-Rong Shen is a professor at College of Information Science and Engineering, Northeastern University. She received her Ph.D. degree in computer software and the- ory from Northeastern University of China in 2004. She is a senior member of CCF. Her main research interests include distributed and parallel systems, Web data management and data grid. E-mail：yuge@ise.neu.edu.cn Ge Yu is a professor at College of Information Science and Engineering, Northeastern University. He received his Ph.D. degree in computer science from Kyushu University of Japan in 1996. He is a member of IEEE, ACM, and a senior member of CCF. His research interests include database theory and technology, distributed and parallel systems, embedded software, network information security. E-mail： nietiezheng@ise.neu.edu.cn Tie-Zheng Nie is a lecturer at College of Information Science and Engineering, Northeastern University. He received his Ph.D. degree in computer software and theory from Northeastern University of China in 2009. He is a student member of CCF. His main research interests include Web data management and information integration.