Abstract By providing unified access to multiple underlying search engines, metasearch engine is an intuitiveway to increase the coverage of the WWW. Great progress has been made in this area, butthe previous studies ignore the perspectives of users. This paper proposes a personalization mechanism for metasearch engine based on multi-agent system to improve precision ratio. The proposed mechanism obtains user interests from click-through data, schedules the appropriate underlying search engines according to the expertness model, and merges results based on user interest distribution. Moreover, it also has the ability to provide personalized result recommendation. Compared with the baseline results, experimental results show that the proposed personalization mechanism performs better on precision. The proposed metasearch engine is feasible for providing useful search results more effectively.

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[20] Zhou K., Zha H., Xue G., and Yu Y., “Learning the Gain Values and Discount Factors of DCG,” IEEE Transactions on Knowledge and Data Engineering, vol. 26, no. 2, pp. 391-404, 2012. A Personalized Metasearch Engine Based on Multi-Agent System 987 Meijia Wang received the M.E. degree in College of Information Engineering from Northwest A&F University. Now she is a PhD. Candidate in Xidian University. Her main research interests include Agent-oriented software engineering, data analysis, and social network analysis. Qingshan Li received his Ph.D. degree from Xidian University. Now he is a professor, PhD supervisor in Software Engineering Institute, Xidian University. His main research interests include agent-oriented software engineering, self-adaptive system, and data analysis. Yishuai Lin received the Ph.D. degree from Université de Technologie de Belfort-Montbéliard. Now, she is a lecture in Software Engineering Institute, Xidian University, Her main research interests include agent-oriented software engineering, knowledge management, and product design. Yingjian Li received the M.E. degree in Software Engineering Institute from Xidian University. His main research interests include Agent-oriented software engineering, information retrieval, and data analysis. Boyu Zhou received the M.E. degree in Software Engineering Institute from Xidian University. His main research interests include Agent-oriented software engineering, and information retrieval.