中文摘要：

Rong Zhang received her BS degree in computer science from Northeastern University, China in 2001 and PhD de- gree in computer science from Fudan University in 2007, China. She joined East China Normal University （ECNU） since 2011 and is currently an associ- ated professor in this university. From 2007 to 2010, she worked as an expertresearcher in NICT, Japan. Her current research interests include knowledge management and distributed data management. Wenzhe Yu is currently pursuing her MS degree in Center for Cloud Com- puting and Big Data （CCCBD）, In- stitute of Software Engineering, East China Normal University （ECNU）, China. Before that, she received her BS degree in software engineering from ECNU in 2012. Her current research interests include Web data mining anddata integration. Chaofeng Sha is an assistant profes- sor in Fudan University. He received the BS degree in applied mathematics in 1998 from Xidian University, China, the MS degree in 2001 and the PhD degree in 2009 from Fudan University, China, both in computer science. Since 2001, he has been in the School of Computer Science at Fudan University.His work is in the area of data mining and data management. Xiaofeng He is a professor at Institute of Software Engineering, East China normal University （ECNU）, China. He obtained his PhD degree from the Pennsylvania State University, USA. Xiaofeng＇s research interests include machine learning, data mining, in- formation retrieval. Prior to joining ECNU, Xiaofeng worked with Mi-crosoft, Yahoo and Lawrence Berkeley National Laboratory.E-mail： {rzhang,xflae,ayzhou} @sei.ecnu.edu.cn, cfsha@fudan.edu.cn, sei_.ywz2008 @ 126.com Aoying Zhou is a professor in computer science at East China Normal Univer- sity （ECNU）, China, where he is head- ing the Institute of Massive Computing. Before joining ECNU in 2008, Aoy- ing worked for Fudan University at the Computer Science Department for 15 years. He is the winner of the National Science Fund for Distinguished YoungScholars supported by