About me

I am now working as associate professor (with tenure) at the Department of Computer Science and Technology in Tsinghua University, Beijing, China. My major research interests are in Web Search, User Behavior Analysis, and Natural Language Processing. I am also a Principle Investigator (PI) of a joint Center (named NExT) between National University of Singapore and Tsinghua University to develop technologies for live media search.

Recent Professional Activities

Selected Publications

  • IN THE YEAR OF 2018

    • Xiaohui Xie, Yiqun Liu, Maarten de Rijke, Jiyin He, Min Zhang and Shaoping Ma. Why People Search for Images using Web Search Engines. The eleventh ACM International Conference on Web Search and Data Mining (WSDM 2018)
    • Ning Su, Jiyin He, Yiqun Liu, Min Zhang and Shaoping Ma. User Intent, Behaviour, and Perceived Satisfaction in Product Search. The eleventh ACM International Conference on Web Search and Data Mining (WSDM 2018)
  • IN THE YEAR OF 2017

    • Xiangsheng Li, Cheng Luo, Yiqun Liu and Shaoping Ma. Chinese Translation of SIGIR Forum 2017 special issue (with the permission of orginal editors/authors).
    • Yiqun Liu, Chao Wang, Min Zhang and Shaoping Ma. User behavior modeling for better web search ranking. Frontiers in Computer Science 2017. Preprint Version.
    • Yiqun Liu, Yi Chang and Jian-Yun Nie. Constructing click models for search users. Information Retrieval Journal, 20(1), 1-3. Online Version.
    • Ye Chen, Yiqun Liu, Min Zhang and Shaoping Ma. User Satisfaction Prediction with Mouse Movement Information in Heterogeneous Search Environment. IEEE Transactions on Knowledge and Data Engineering. (TKDE) Preprint Version
    • Fan Zhang, Yiqun Liu, Xin Li, Min Zhang, Yinghui Xu and Shaoping Ma. Evaluating Web Search with a Bejeweled Player Model. The 39th ACM SIGIR International Conference on Research and Development in Information Retrieval (SIGIR2017 Best Student Paper Award). Preprint Version
    • Cheng Luo, Yiqun Liu, Tetsuya Sakai, Fan Zhang, Min Zhang and Shaoping Ma. Evaluating Mobile Search with Height-Biased Gain. The 39th ACM SIGIR International Conference on Research and Development in Information Retrieval (SIGIR2017). Preprint Version
    • Ye Chen, Ke Zhou, Yiqun Liu, Min Zhang and Shaoping Ma. Meta-evaluation of Online and Offline Web Search Evaluation Metrics. The 39th ACM SIGIR International Conference on Research and Development in Information Retrieval (SIGIR2017). Preprint Version Data Description Dataset
    • Xiaohui Xie, Yiqun Liu, Xiaochuan Wang, Meng Wang, Zhijing Wu, Yingying Wu, Min Zhang and Shaoping Ma. Investigating Examination Behavior of Image Search Users. The 39th ACM SIGIR International Conference on Research and Development in Information Retrieval (SIGIR2017). Preprint Version
    • Jiaxin Mao, Yiqun Liu, Huanbo Luan, Min Zhang and Shaoping Ma. Understanding and Predicting Usefulness Judgment in Web Search. (Short paper). The 39th ACM SIGIR International Conference on Research and Development in Information Retrieval (SIGIR2017). Preprint Version
    • Cheng Luo, Yukun Zheng, Yiqun Liu, Xiaochuan Wang, Jingfang Xu, Min Zhang and Shaoping Ma. SogouT-16: A New Web Corpus to Embrace IR Research. (Short paper). The 39th ACM SIGIR International Conference on Research and Development in Information Retrieval (SIGIR2017). Preprint Version
    • Zeyang Liu, Jiaxin Mao, Chao Wang, Qingyao Ai, Yiqun Liu, Jian-Yun Nie. Enhancing click models with mouse movement information. Information Retrieval Journal, 20(1), 53-80. Preprint Version.
    • Xiao Lin, Min Zhang, Yongfeng Zhang, Yiqun Liu and Shaoping Ma. Learning and Transferring Social and Item Visibilities for Personalized Recommendation. The 26th ACM International Conference on Information and Knowledge Management (CIKM 2017).
    • Bin Liu, Min Zhang, Weizhi Ma, Xin Li, Yiqun Liu and Shaoping Ma. A Two-step Information Accumulation Strategy for Learning from Highly Imbalanced Data. The 26th ACM International Conference on Information and Knowledge Management (CIKM 2017).
    • Yuli Liu, Yiqun Liu, Ke Zhou, Min Zhang and Shaoping Ma. Detecting Collusive Spamming Activities in Community Question Answering. The 26th International World Wide Web Conference (WWW 2017). Preprint PDF Dataset
    • Yingying Wu, Yiqun Liu, Ning Su, Shaoping Ma and Wenwu Ou. Predicting Search Satisfaction with Electrodermal Activity. The 26th International World Wide Web Conference (WWW 2017). Preprint PDF
    • Cheng Luo, Yiqun Liu, Tetsuya Sakai, Ke Zhou, Fan Zhang, Xue Li and Shaoping Ma. Does Document Relevance Affect the Searcher’s Perception of Time? The Tenth ACM International Conference on Web Search and Data Mining (WSDM 2017) Preprint PDF
    • Xin Li, Yiqun Liu, Rongjie Cai and Shaoping Ma. Investigation of User Search Behavior While Facing Heterogeneous Search Services. The Tenth ACM International Conference on Web Search and Data Mining (WSDM 2017) Preprint PDF Dataset
    • Cheng Luo, Xue Li, Yiqun Liu, Tetsuya Sakai, Fan Zhang, Min Zhang and Shaoping Ma. Investigating Users’ Time Perception during Web Search. The 2nd ACM SIGIR Conference on Human Information Interaction & Retrieval (CHIIR 2017). Preprint PDF
  • IN THE YEAR OF 2016

    • Yiqun Liu, Xiaohui Xie, Chao Wang, Jian-Yun Nie, Min Zhang and Shaoping Ma. Time-Aware Click Model. ACM Transactions on Information Systems (TOIS). Vol. 35, No. 3, Article 16. Preprint PDF Code Sample Data
    • Cheng Luo, Yiqun Liu, Min Zhang, and Shaoping Ma. Search Success Evaluation with Translation Model. The 12th Asia Information Retrieval Societies Conference (AIRS2016 Best Paper Honorable Mention). Preprint PDF
    • Yuli Liu, Yiqun Liu, Ke Zhou, Min Zhang and Shaoping Ma. Detecting Promotion Campaigns in Query Auto Completion. The 25th ACM International Conference on Information and Knowledge Management (CIKM 2016). Preprint PDF Dataset
    • Yiqun Liu, Zeyang Liu, Ke Zhou, Meng Wang, Huanbo Luan, Chao Wang, Min Zhang, Shaoping Ma. Predicting Search User Examination with Visual Saliency Information. The 39th ACM SIGIR International Conference on Research and Development in Information Retrieval (SIGIR2016). Preprint PDF Dataset
    • Jiaxin Mao, Yiqun Liu, Ke Zhou, Jian-Yun Nie, Min Zhang, Shaoping Ma. When does Relevance Mean Usefulness and User Satisfaction in Web Search? The 39th ACM SIGIR International Conference on Research and Development in Information Retrieval (SIGIR2016). Preprint PDF Dataset
    • Yuli Liu, Yiqun Liu, Min Zhang and Shaoping Ma. Pay Me and I’ll Follow You: Detection of Crowdturfing Following Activities in Microblog Environment. The 25th International Joint Conference on Artificial Intelligence (IJCAI2016). Preprint PDF Dataset
    • Chao Wang, Yiqun Liu, Shaoping Ma. Building a click model: From idea to practice. CAAI Transactions on Intelligence Technology. Volume 1(2016) 313-322. Preprint PDF
    • Weizhi Ma, Min Zhang, Yiqun Liu and Shaoping Ma. Rating-Boosted Latent Topics: Understanding Users and Items with Ratings and Reviews. The 25th International Joint Conference on Artificial Intelligence (IJCAI2016)
    • Yunzhi Tan, Min Zhang, Yiqun Liu and Shaoping Ma. Multi-grained Role Labeling Based on Multi-modality Information for Real Customer Service Telephone Conversation. The 25th International Joint Conference on Artificial Intelligence (IJCAI2016)
    • Yongfeng Zhang, Qi Zhao, Yi Zhang, Daniel Friedman, Min Zhang, Yiqun Liu, Shaoping Ma. Economic Recommendation with Surplus Maximization. In Proceedings of the 25th International World Wide Web Conference (WWW 2016). Preprint PDF
    • Cheng Luo, Fan Zhang, Xue Li, Yiqun Liu, Min Zhang, Shaoping Ma. Manipulating Time Perception of Web Search Users. First ACM SIGIR Conference on Human Information Interaction and Retrieval (CHIIR 2016). Preprint PDF Poster
  • IN THE YEAR OF 2015

    • Chao Wang, Yiqun Liu, Meng Wang, Ke Zhou, Jian-Yun Nie, Shaoping Ma, Incorporating Non-sequential Behavior into Click Models. Proceedings of the 38th ACM SIGIR International Conference on Research and Development in Information Retrieval (SIGIR2015 Best Paper Honorable Mention).Preprint PDF Code and Dataset
    • Ye Chen, Yiqun Liu, Ke Zhou, Min Zhang, Shaoping Ma. Does Vertical Bring more Satisfaction? Predicting Search Satisfaction in a Heterogeneous Environment. The 24th ACM International Conference on Information and Knowledge Management (CIKM 2015) Preprint PDF
    • Fei Jiang, Yiqun Liu, Huanbo Luan, Jiashen Sun, Xuan Zhu, Min Zhang, Shaoping Ma. Microblog Sentiment Analysis with Emoticon Space Model. Journal of Computer Science and Technology (JCST). 2015 Preprint PDF
    • Yiqun Liu, Ye Chen, Jinhui Tang, Jiashen Sun, Min Zhang, Shaoping Ma, Xuan Zhu, Different users, Different Opinions: Predicting Search Satisfaction with Mouse Movement Information. Proceedings of the 38th ACM SIGIR International Conference on Research and Development in Information Retrieval (SIGIR2015).Preprint PDF
    • Zeyang Liu, Yiqun Liu, Ke Zhou, Min Zhang, Shaoping Ma, Influence of Vertical Result in Web Search Examination. Proceedings of the 38th ACM SIGIR International Conference on Research and Development in Information Retrieval (SIGIR2015).Preprint PDF
    • Huiqi Hu, Yiqun Liu, Guoliang Li, Jianhua Feng, A Location-Aware Publish/Subscribe Framework for Parameterized Spatio-Textual Subscriptions, The 31st IEEE International Conference on Data Engineering (ICDE 2015)
    • Xin Li, Yiqun Liu, Min Zhang, Shaoping Ma, Xuan Zhu, Jiashen Sun, Detecting Promotion Campaigns in Community Question Answering, International Joint Conference on Artificial Intelligence (IJCAI 2015).Preprint PDF
    • Ilya Markov, Aleksandr Chuklin, and Yiqun Liu. Modeling search behavior in heterogeneous environments. The First Workshop on Heterogeneous Information Access at WSDM 2015, Shanghai, China, pp. 22-24.
    • Yongfeng Zhang, Min Zhang, Yi Zhang, Yiqun Liu and Shaoping Ma. Daily-Aware Personalized Recommendation based on Feature-Level Time Series Analysis. The 24th International World Wide Web conference (WWW2015)
    • Yongfeng Zhang, Yunzhi Tan, Min Zhang, Yiqun Liu, Shaoping Ma, Catch the Black Sheep: Unified Shilling Attack Detection based on Fraudulent Action Propagation. International Joint Conference on Artificial Intelligence (IJCAI 2015).
  • IN THE YEAR OF 2014

    • Yiqun Liu, Ruihua Song, Min Zhang, Zhicheng Dou, Takehiro Yamamoto, Makoto Kato, Hiroaki Ohshima, Ke Zhou. Overview of the NTCIR-11 IMine Task. Proceedings of the 11th NTCIR conference.
    • Yiqun Liu, Chao Wang, Ke Zhou, Jianyun Nie, Min Zhang, Shaoping Ma, From Skimming to Reading: A Two-stage Examination Model for Web Search, The 23rd ACM International Conference on Information and Knowledge Management (CIKM 2014) Preprint PDF Data Set SLIDES
    • Shuai Huo, Min Zhang, Yiqun Liu, Shaoping Ma, Improving Tail Query Performance by Fusion Model. The 23rd ACM International Conference on Information and Knowledge Management (CIKM 2014)
    • Yongfeng Zhang, Min Zhang, Yi Zhang, Yiqun Liu, Shaoping Ma, Understanding the Sparsity: Augmented Matrix Factorization with Sampled Constraints on Unobservables. The 23rd ACM International Conference on Information and Knowledge Management (CIKM 2014)
    • Xin Li, Yiqun Liu, Min Zhang, Shaoping Ma, Fraudulent Support Telephone Number Identification Based on Co-occurrence Information on the Web, Proceedings of the Twenty-Eighth AAAI Conference on Artificial Intelligence (AAAI 2014). Preprint PDF Data Set
    • Yongfeng Zhang, Guokun Lai, Min Zhang, Yi Zhang, Yiqun Liu, Shaoping Ma. Explicit Factor Models for Explainable Recommendation based on Phrase-level Sentiment Analysis, The 37th ACM SIGIR conference (SIGIR 2014). Preprint PDF
    • Yongfeng Zhang, Haochen Zhang, Min Zhang, Yiqun Liu, Shaoping Ma. Do users rate or review?: boost phrase-level sentiment labeling with review-level sentiment classification. The 37th ACM SIGIR conference(SIGIR 2014).
    • Xiangnan He, Ming Gao, Min-Yen Kan, Yiqun Liu, Kazunari Sugiyama. Predicting the Popularity of Web 2.0 Items Based on User Comments. The 37th ACM SIGIR conference (SIGIR 2014)
    • Xin Li, Min Zhang, Yiqun Liu, Shaoping Ma, Yijiang Jin and Liyun Ru. Search Engine Click Spam Detection Based on Bipartite Graph Propagation. Proceedings of the 7th ACM International Conference on Web Search and Data Mining (WSDM 2014). Preprint PDF
    • Fei Chen, Yiqun Liu, Jian Li, Min Zhang and Shaoping Ma. A Pruning Algorithm for Optimal Diversified Search. Poster proceedings of the 23th International World Wide Web conference (WWW2014). Preprint PDF
    • Jiaxin Mao, Yiqun Liu, Min Zhang and Shaoping Ma. Social Influence Analysis for Microblog User based on User Behavior. Chinese Journal of Computer. 37(4):1-10. (in Chinese) Preprint PDF
    • Zeyang Liu, Yiqun Liu, Min Zhang, and Shaoping Ma. How Do Sponsored Search Results Affect User Behavior in Web Search? Proceedings of the 10th Asia Information Retrieval Society Conference (AIRS 2014). Preprint PDF Data Set
    • Fei Chen, Yiqun Liu, Zhicheng Dou, Keyang Xu, Yujie Cao, Min Zhang, and Shaoping Ma. Revisiting the Evaluation of Diversified Search Evaluation Metrics with User Preferences. Proceedings of the 10th Asia Information Retrieval Society Conference (AIRS 2014). Preprint PDF
    • Cheng Luo, Yiqun Liu, Min Zhang, and Shaoping Ma. Query Ambiguity Identification Based on User Behavior Information. Proceedings of the 10th Asia Information Retrieval Society Conference (AIRS 2014). Preprint PDF
    • Haochen Zhang, Min-Yen Kan, Yiqun Liu, and Shaoping Ma. Online Social Network Profile Linkage. Proceedings of the 10th Asia Information Retrieval Society Conference (AIRS 2014). Preprint PDF
    • Jiaxin Mao, Yiqun Liu, Min Zhang, and Shaoping Ma. Estimating Credibility of User Clicks with Mouse Movement and Eye-tracking Information. The 3rd CCF Conference on Natural Language Processing & Chinese Computing (NLPCC 2014). Preprint PDF
    • Bin Liang, Yiqun Liu, Min Zhang, Shaoping Ma, Liyun Ru, Kuo Zhang: Searching for people to follow in social networks. Expert System with Applications 41(16): 7455-7465 (2014)
    • Fei Jiang, Yiqun Liu, Huanbo Luan, Min Zhang, and Shaoping Ma. Microblog Sentiment Analysis with Emoticon Space Model. The 3rd National Conference on Social Media Processing (SMP2014). Preprint PDF
  • IN THE YEAR OF 2013

    • Qianli Xing, Yiqun Liu, Min Zhang, Shaoping Ma, Jianyun Nie, Kuo Zhang. Incorporating User Preferences into Click Models. The 22nd ACM International Conference on Information and Knowledge Management (CIKM 2013) Preprint PDF
    • Jian Liu, Yiqun Liu, Min Zhang, Shaoping Ma, Kuo Zhang. A Study of Long-term Search Engine Users' Behavior. The 22nd ACM International Conference on Information and Knowledge Management (CIKM 2013) (short paper) Preprint PDF
    • Qianli Xing, Yiqun Liu, Min Zhang, Shaoping Ma, and Kuo Zhang. Characterizing Expertise of Search Engine Users. The ninth Asian Information Retrieval Societies Conference (AIRS 2013) Preprint PDF
    • Cheng Luo, Yiqun Liu, Shaoping Ma, Min Zhang, Liyun Ru, and Kuo Zhang. Pornography Detection with the Wisdom of Crowds. The ninth Asian Information Retrieval Societies Conference (AIRS 2013) Preprint PDF
    • Yiqun Liu, Jie Tang. Introduction to the 22nd World Wide Web conference. Communications of the CCF 9(6):61-64. 2013.6. (in Chinese) Preprint PDF
    • Yongfeng Zhang, Min Zhang, Yiqun Liu, Shaoping Ma and Shi Feng. Localized Matrix Factorization for Recommendation based on Matrix Block Diagonal Forms. The 22nd International World Wide Web conference (WWW2013). pp.1511-1520. PDF
    • Chao Wang, Yiqun Liu, Min Zhang, Shaoping Ma, Meihong Zheng, Jing Qian, Kuo Zhang. Incorporating Vertical Results into Search Click Models. The 36th ACM SIGIR conference (SIGIR 2013). Preprint PDF
    • Jianxun Cao, Yiqun Liu, Rongwei Cen, Shaoping Ma, Liyun Ru. Identifying Porn Sites with User Behavior Analysis. Journal of Computer Research and Development. 50(2):430-436. 2013 (in Chinese)
    • Yongfeng Zhang, Min Zhang, Yiqun Liu, Shaoping Ma. Improve Collaborative Filtering Through Bordered Block Diagonal Form Matrices. The 36th ACM SIGIR conference (SIGIR 2013).
  • IN THE YEAR OF 2012

    • Yiqun Liu, Yufei Xue, Danqing Xu, Ronwei Cen, Min Zhang, Shaoping Ma, Liyun Ru. Constructing a Reliable Web Graph with Information on Browsing Behavior. Decision Support Systems (2012) 54:390-401. doi:10.1016/j.dss.2012.06.001. Preprint PDF
    • Chao Wei, Yiqun Liu, Min Zhang, Liyun Ru, Shaoping Ma, Kuo Zhang. Fighting against Web Spam: A Novel Propagation Method based on Click-through Data. Proceedings of the 35th Annual ACM SIGIR Conference (SIGIR2012). Preprint PDF
    • Danqing Xu, Yiqun Liu, Min Zhang and Shaoping Ma. Incorporating Revisiting Behaviors into Click Models. Proceedings of the 5th ACM International Conference on Web Search and Data Mining . WSDM 2012 (Seattle, U.S.). pp. 303-312. PDF
    • Anqi Cui, Min Zhang, Yiqun Liu, Shaoping Ma, Kuo Zhang. Discover breaking events with popular hashtags in twitter. Proceedings of the 21st ACM international conference on Information and knowledge management (CIKM 2012).
    • Yiqun Liu, Fei Chen, Weize Kong, Huijia Yu, Min Zhang, Shaoping Ma, Liyun Ru. Identifying Web Spam with the Wisdom of the Crowds. ACM Transaction on the Web. Volume 6, Issue 1, Article No. 2, 30 pages. March 2012. Preprint PDF
    • Yuchen Tian, Yiqun Liu, Danqing Xu, Ting Yao, Min Zhang and Shaoping Ma. Incorporating Seasonal Time Series Analysis with Search Behavior Information in Sales Forecasting. Accepted by Proceedings of the 21th international Conference on World Wide Web (WWW 2012). pp. 615-616. Preprint PDF
  • IN THE YEAR OF 2011

    • Yiqun Liu, Junwei Miao, Min Zhang, Shaoping Ma, Liyun Ru. How Do Users Describe Their Information Need: Query Recommendation based on Snippet Click Model. Expert Systems With Applications. 38(11): 13847-13856, 2011. Preprint PDF
    • Bo Zhou, Yiqun Liu, Min Zhang, Yijiang Jin, Shaoping Ma, Incorporating Web Browsing Information into Anchor Texts for Web Search, Information Retrieval Volume 14, Issue 3: 290-314, 2011. PDF
    • Danqing Xu, Yiqun Liu, Min Zhang, Liyun Ru, Shaoping Ma. Predicting Epidemic Tendency through Search Behavior Analysis. In Proceedings of the 22nd International Joint Conference on Artificial Intelligence (IJCAI-11) (Barcelona, Spain). pp. 2361-2366. PDF
    • Jiazhuo Wang, Yiqun Liu, Shaoping Ma, Min Zhang. Sponsored Search Performance Analysis based on User Behavior Information. Journal of Computer Research and Development Vol.48(1):133-138. 2011.1. (in Chinese)
    • Qi Fang, Yiqun Liu, Min Zhang, Liyun Ru, Shaoping Ma. Topic identification for Session Segmentation of Web Access Logs. Journal of Chinese Information Processing, Vol.25(1): pp. 35-40. 2011.1 (in Chinese)
    • Weize Kong, Yiqun Liu, Min Zhang, Shaoping Ma. Answer Quality Analysis on Community Question Answering. Journal of Chinese Information Processing, Vol.25(1): pp. 3-8. 2011.1 (in Chinese)
    • Danqing Xu, Yiqun Liu, Rongwei Cen, Shaoping Ma, Liyun Ru, Lei Yang. Research on User Input Behavior Based on Log Analysis of a Chinese Input Method. Journal of Chinese Information Processing, Vol.25(2): pp. 44-48. 2011.3 (in Chinese)
  • IN THE YEAR OF 2010

    • Rongwei Cen, Yiqun Liu, Min Zhang, Liyun Ru, Shaoping Ma. Reliable Analysis for the Behavior of Web Retrieval Users(In Chinese). Journal of Software. Vol.21(5):1055-1066, 2010.5. PDF
    • Rongwei Cen, Yiqun Liu, Min Zhang, Liyun Ru, Shaoping Ma. 2010. Study language models with specific user goals. In Proceedings of the 19th international Conference on World Wide Web (Raleigh, North Carolina, USA, April 26 - 30, 2010). WWW '10. ACM, New York, NY, 1073-1074. ACM
    • Weize Kong, Yiqun Liu, Shaoping Ma and Liyun Ru. 2010. Detecting epidemic tendency by mining search logs. In Proceedings of the 19th international Conference on World Wide Web (Raleigh, North Carolina, USA, April 26 - 30, 2010). WWW '10. ACM, New York, NY, 1133-1134. ACM
    • Qianli Xing, Yiqun Liu, Rongwei Cen, Min Zhang, Shaoping Ma and Liyun Ru. 2010. Are search engine users equally reliable?. In Proceedings of the 19th international Conference on World Wide Web (Raleigh, North Carolina, USA, April 26 - 30, 2010). WWW '10. ACM, New York, NY, 1207-1208. ACM
    • Guichun Hua, Min Zhang, Yiqun Liu, Shaoping Ma and Liyun Ru. 2010. Hierarchical feature selection for ranking. In Proceedings of the 19th international Conference on World Wide Web (Raleigh, North Carolina, USA, April 26 - 30, 2010). WWW '10. ACM, New York, NY, 1113-1114. ACM
    • Rongwei Cen, Yiqun Liu, Min Zhang, Liyun Ru and Shaoping Ma. Abnormal Click Analysis in Web User Access Logs. Journal of Chinese Information Processing, Vol.24(3): pp. 44-48. 2010.5 (in Chinese)
    • Qian Wang, Yiqun Liu, Shaoping Ma and Liyun Ru. Search Engine User Behavior Analysis Based on Log Mining Journal of Chinese Information Processing, Vol.24(3): pp. 49-54. 2010.5 (in Chinese)
    • Bo Zhou, Rongwei Cen, Yiqun Liu, Min Zhang, Yijiang Jin and Shaoping Ma. A Document Relevance Based Search Result Re-Ranking. Journal of Chinese Information Processing, Vol.24(3): pp. 19-23. 2010.5 (in Chinese)
  • IN THE YEAR OF 2009

    • Yiqun Liu, Yijiang Jin, Min Zhang, Shaoping Ma and Liyun Ru. User Browsing Graph: Structure, Evolution and Application. Late breaking result session in Second ACM International Conference on Web Search and Data Mining (WSDM 2009). 2009.2 PDF  SLIDES
    • Rongwei Cen, Yiqun Liu, Min Zhang, Bo Zhou, Liyun Ru, Shaoping Ma. Exploring Relevance for Clicks. In Proceeding of the 18th ACM Conference on information and Knowledge Management (Hong Kong, China, November 02 - 06, 2009). CIKM '09. ACM, New York, NY, 1847-1850. ACM
    • Rongwei Cen, Yiqun Liu, Min Zhang, Liyun Ru, Shaoping Ma. Web Observation from a User Perspective. In Proceedings of the 2009 IEEE/WIC/ACM international Joint Conference on Web intelligence and intelligent Agent Technology - Volume 01 (September 15 - 18, 2009). Web Intelligence & Intelligent Agent. IEEE Computer Society, Washington, DC, 291-294.PDF
    • Huijia Yu, Yiqun Liu, Min Zhang, Shaoping Ma and LiYun Ru. Web Spam Identification with User Browsing Graph. Asia Information Retrieval Symposium 2009 (AIRS 2009), also in Springer LNCS 5839, pp. 38-49, 2009.11.
    • Rongwei Cen, Yiqun Liu, Min Zhang, Liyun Ru, Shaoping Ma. Study on the Click Context of Web Search Users for Reliability Analysis. Asia Information Retrieval Symposium 2009 (AIRS 2009), also in Springer LNCS 5839, pp. 397¨C408, 2009.11.
    • Rongwei Cen, Yiqun Liu, Min Zhang, Liyun Ru, Shaoping Ma. Automatic Search Engine Performance Evaluation with the Wisdom of Crowds. Asia Information Retrieval Symposium 2009 (AIRS 2009), also in Springer LNCS 5839, pp. 351¨C362, 2009.11.
    • Huijia Yu, Yiqun Liu, Min Zhang, Shaoping Ma and Liyun Ru. Web Spam Taxonomy via Spam Intention Analysis. Journal of Chinese Information Processing, Vol.23(2): pp. 95-101. 2009.3 (in Chinese)
    • Yiqun Liu, Bo ZHOU, Min ZHANG, Shaoping MA, Liyun RU, Effectiveness of Online Sponsored Search Based on User Log Analysis. Journal of Computational Information Systems. (Accepted)  Preprint PDF
  • IN THE YEAR OF 2008

    • Yiqun Liu, Min Zhang, Shaoping Ma, Liyun Ru. User behavior oriented web spam detection. In Proceeding of the 17th international Conference on World Wide Web (Beijing, China, April 21 - 25, 2008). WWW '08. ACM, New York, NY, 1039-1040.   ACM
    • Yiqun Liu, Rongwei Cen, Min Zhang, Shaoping Ma, Liyun Ru. Identifying Web Spam with User Behavior Analysis. The Fourth International Workshop on Adversarial Information Retrieval on the Web. 2008.4. ACM
    • Yiqun Liu, Rongwei Cen, Min Zhang, Shaoping Ma. Automatic Search Engine Evaluation Based On User Behavior Analysis (in Chinese). Journal of Software, Vol.19(11):3023-3032. 2008.11. Preprint PDF
    • Yong Wang, Yiqun Liu, Min Zhang, Shaoping Ma, Liyun Ru, Identify Temporal Websites Based on User Behavior Analysis, The Third International Joint Conference on Natural Language Processing, Hyderabad, India, January 7-12, 2008
    • Yong Wang, Yiqun Liu, Min Zhang, Shaoping Ma, News Page Discovery Policy for Instant Crawlers, Asia Information Retrieval Symposium 2008, Harbin, China, January 16-18, 2008
    • Yong Wang, Yiqun Liu, Min Zhang, Ma Shaoping, Ru Liyun, Modeling Lifetime of Web Pages Based on User Interest Analysis, Journal of Chinese Information Processing, Vol.22(2): pp. 76-80. 2008.3. (in Chinese)
    • Shaoping Ma, Yiqun Liu. Method for finding needle in a haystack: Techniques and challenges in Chinese Web information retrieval (in Chinese). Communications of China Computer Federation, 2008.1. Preprint PDF
    • Lei Chen, Yiqun Liu, Liyun Ru, Shaoping Ma. Effectiveness of Online Sponsored Search Based on User Log Analysis. Journal of Chinese Information Processing, Vol.22(6): pp. 92-97. 2008.11 (in Chinese)
  • IN THE YEAR OF 2007

    • Yiqun Liu, Min Zhang, Liyun Ru, Shaoping Ma. Data Cleansing for Web Information Retrieval using Query Independent Features. Journal of the American Society for Information Science and Technology (JASIST), Volume 58, Issue 12, Pages 1884-1898, 2007. Preprint PDF
    • Yiqun Liu, Yupeng Fu, Min Zhang, Liyun Ru, Shaoping Ma. 2007. Automatic search engine performance evaluation with click-through data analysis. In Proceedings of the 16th international Conference on World Wide Web (Banff, Alberta, Canada, May 08 - 12, 2007). WWW '07. ACM, New York, NY, 1133-1134. ACM  POSTER
    • Yiqun Liu, Min Zhang, Shaoping Ma. Web key resource page selection based on non-content information (in Chinese). CAAI Transactions on Intelligent Systems, 2(1), 2007. PDF
    • Huijia Yu, Yiqun Liu, Min Zhang, Liyun Ru and Shaoping Ma, Research in Search Engine User Behavior Based on Log Analysis (in Chinese). Journal of Chinese Information Processing. Vol. 21(1): pp. 109-114, 2007. PDF
    • Yupeng Fu, Rongjing Xiang, Yiqun Liu, Min Zhang, Shaoping Ma: A CDD-based formal model for expert finding. In Proceedings of the Sixteenth ACM Conference on Conference on information and Knowledge Management(CIKM 2007): 881-884.
    • Yupeng Fu, Rongjing Xiang, Yiqun Liu, Min Zhang, Shaoping Ma: Finding Experts Using Social Network Analysis. In Proceedings of the IEEE/WIC/ACM international Conference on Web intelligence (Web Intelligence) 2007: 77-80.
  • BEFORE THE YEAR OF 2007

    • Yiqun Liu, Canhui Wang, Min Zhang, Shaoping Ma, Learning-based Web Data Cleansing for Information Retrieval, Journal of Computational Information Systems, Vol 1(n4): pp. 709-716, 2005. Preprint PDF  SLIDES
    • Yiqun Liu, Min Zhang, Shaoping Ma, Effective Topic Distillation with Key Resource Pre-selection, Lecture Notes in Computer Science, Volume 3411, pp. 129-140, 2004. PDF  SLIDES
    • Yiqun Liu, Min Zhang, Liyun Ru, Shaoping Ma, Automatic Query Type Identification Based on Click Through Information, Asia Information Retrieval Symposium, AIRS 2006, in Lecture Notes in Computer Science Vol. 4182: pp. 593-600, 2006. PDF  POSTER
    • Yiqun Liu, Canhui Wang, Min Zhang, and Shaoping Ma. 2005. Web data cleansing for information retrieval using key resource page selection. In Special interest Tracks and Posters of the 14th international Conference on World Wide Web (Chiba, Japan, May 10 - 14, 2005). WWW '05. ACM, New York, NY, 1136-1137. PDF  POSTER
    • Yiqun Liu, Min Zhang, Shaoping Ma. Web Key Resource Page Selection Based On Improved Decision Tree Algorithm. (in Chinese) Journal of software, Vol. 16(11): pp. 1958-1966, 2005. PDF
    • Yiqun Liu, Canhui Wang, Min Zhang, Shaoping Ma, Finding "Abstract Fields" of Web Pages and Query Specific Retrieval--THUIR at TREC 2004 Web Track, NIST Special Publication: SP 500-261, Proceedings of the Thirteenth Text Retrieval Conference (TREC 2004). PDF from TREC website
    • Yiqun Liu, Min Zhang, Shaoping Ma. Effective Web IR Based on Virtual Site Entry Page Selection (in Chinese). Journal of Chinese Information Processing, Vol. 19(2): pp. 44-50, 2005. PDF
    • Yiqun Liu, Min Zhang, Shaoping Ma. Web Data Cleansing for Effective Information Retrieval (in Chinese). Journal of Chinese Information Processing. Vol. 20(3): pp. 70-77, 2006. PDF
    • Yiqun Liu, Min Zhang, Shaoping Ma. Review of User Behavior Analysis in Web IR Research (in Chinese). The 7th Joint Symposium on Computational Linguistics (JSCL2005). pp 488-494, 2005. PDF
    • Yiqun Liu, Min Zhang, Liyun Ru and Shaoping Ma, Data Cleansing for Web Information Retrieval using Query Independent Features. Proceedings of the 1st China-Kyoto International Student Workshop on Digital Content and Web Computing. 2006.3. PDF  SLIDES
    • Canhui Wang, Yiqun Liu, Min Zhang, and Shaoping Ma. Topic-Independent Web High-Quality Page Selection Based on K-Means Clustering. Asia Information Retrieval Symposium, 2005. Lecture Notes in Computer Science, Volume 3689, pp.516-521. PDF
    • Rongwei Cen, Yiqun Liu, Min Zhang, Liyun Ru, Shaoping Ma, Web Page Quality Estimation Based on Linear Discriminant Function, Journal of Computational Information Systems.
    • Rongwei Cen, Yiqun Liu, Min Zhang, Yijiang Jin, Shaoping Ma, THUIR at TREC 2006 Terabyte Track, Notebook proceedings of the The Fifteenth Text REtrieval Conference (TREC 2006). pp. 673-676. PDF
    • Yupeng Fu, Rongjing Xiang, Min Zhang, Yiqun Liu, Shaoping Ma, A PDD-based Searching Approach for Expert Finding in Intranet Information Management. Asia Information Retrieval Symposium, AIRS 2006, in Lecture Notes in Computer Science Vol.4182. 2006.
    • Yupeng Fu, Wei Yu, Yize Li, Yiqun Liu, Min Zhang, Shaoping Ma. THUIR at TREC 2005: Enterprise Track. NIST Special Publication: SP 500-266, Proceedings of the Fourteenth Text Retrieval Conference.
    • Min Zhang, Chuan Lin, Yiqun Liu, Leo Zhao, Shaoping Ma: THUIR at TREC 2003: Novelty, Robust and Web. TREC 2003: 556-567.

Recent Slides

Books

Yiqun Liu, Shaoping Ma, Tao Hong, Zizheng Liu. Fundamentals of Search Engine Technology. Tsinghua University Press, 2010.07. Amazon

Recent Research Issues

  • Class “Fundamentals Of Search Engine Technology” (THU 40240762) for undergraduate students (cowork with Baidu.com)
  • Class “Commercial Search Engine Products: Theory, Design and Practice” (THU 80240482) for graduate students (cowork with Google.com)
  • Web User Browsing Graph
  • Web spam detection
  • Search Evaluation Demo: SearchE.thuir.cn
  • User behavior analysis based on log mining (cowork with Sogou.com Labs)

Past Professional Activities:

Patents

  • Yiqun Liu, Min Zhang, Yijiang Jin, Shaoping Ma. An automatic method for search engine performance evaluation. Application No. 200610144289.X, Authorized No. CN100440224C.
  • Yiqun Liu, Min Zhang, Shaoping Ma. A method for locating news pages on the Web. Application No. 200810117516.9. Authorized No. CN101329687.
  • Yiqun Liu, Shaoping Ma, Min Zhang, Yijiang Jin, Kuo Zhang, Liyun Ru. A method and corresponding equipments for synonym extraction. Application No. 200910087076.1. Authorized No. CN101576916
  • Cenrong Wei, Yiqun Liu, Min Zhang, Shaoping Ma. A method for search result reranking based on user behavior anlaysis. Application No. 200710099594.6, Authorized No. CN101055587.
  • Cenrong Wei, Yiqun Liu, Min Zhang, Shaoping Ma. An automatic method for locating key resource pages on the Web. Application No. 200710098531.9, Authorized No.CN101105801.
  • Bo Zhou, Yiqun Liu, Min Zhang, Shaoping Ma. A method of query correction for Chinese search engines. Application No. 200810224323.3. Authorized No. CN101369285.
  • Junwei Miao, Yiqun Liu, Min Zhang, Yijiang Jin, Shaoping Ma, Kuo Zhang, Liyun Ru. Method and system for internet context advertising. Application No. 200910088943.3.
  • Qi Fang, Yiqun Liu, Shaoping Ma, Min Zhang, Yijiang Jin, Zijian Tong, Liyun Ru. A method for Web page recommendation based on Web accsess log analysis. Application No. 200910236869.5.
  • Bo Zhou, Yiqun Liu, Min Zhang, Yijiang Jin, Shaoping Ma, Liyun Ru, Lei Yang. Method and system for Web page description based on browsing behavior. Application No. 201010109570.6.
  • Bo Zhou, Yiqun Liu, Min Zhang, Yijiang Jin, Shaoping Ma, Liyun Ru, Lei Yang. Method and system for Web page description based on search engine interaction behavior. Application No. 201010109586.7.