CERIAS - Center for Education and Research in Information Assurance and Security

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Purdue University
Center for Education and Research in Information Assurance and Security

Luo Si


Associate Professor of Computer Science 



LWSN 2142B 

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PhD, Language and Information Technologies, 2006 Carnegie Mellon University MS, Computer Science and Technology, 2000 Tsinghua University BS, Computer Science and Technology, 1998 Tsinghua University  

Research Areas

Professor Si's research spans a range of topics in information retrieval, machine learning, text mining, speech and multimedia processing, and data mining. His recent research focuses on federated search (distributed information retrieval), probabilistic models for information filtering, and text/data mining for life science. Professor Si has designed systems with his colleagues and acquired good results in evaluation campaigns such as TREC (Text Retrieval Conference) and CLEF (cross-lingual evaluations forum). He has published more than 35 conference, journal and workshop papers. 

Key Areas



Luo Si and Jamie Callan, "Modeling Search Engine Effectiveness for Federated Search", In
Proceedings of the Twenty Seventh Annual International ACM SIGIR Conference on Research and
Development in Information Retrieval, 2005, ACM.

Rong Jin, Luo Si, ChengXiang Zhai, "A Study of Mixture Models for Collaborative Filtering",
Journal of Information Retrieval, 2006.

Luo Si and Jamie Callan, "A Semi-Supervised Learning Method to Merge Search Engine Results", In
ACM Transactions on Information Systems, 24(4), 2003 ACM.