中文摘要：

Zhang Yu, received his Ph.D. degree of computer science and enghaeering in July 2009 at Beijing Institute of Technology, China. He is currently a teacher at School of Computer Science, Beijing University of Civil Engineering and Architecture,China. His research interests include distributed network and cloud confuting. E-mail： zhangyubit@gmail.com Bai Yanping,received her Ph.D. degree of economics in July 2007 at University of Intemational Business and Economics, China. She is currently a teacher at College of Resource Environment and Tourism, Capital Normal University, China. Her research interests include environmental economics and public goods. Email： yibaibaby@126.com Hao Ying, received her M.S. degree of computer science and engineering in July 1991 at Dalian University of Technology, China. She is currently a professor at School of Computer Science, Beijing University of Civil Engineering and Architecture,China. Her research interests include distributed network and artificial intelligence. Email： Haoying@bucea.edu.cn