• 
  Paul Clough, Colum Foley, Cathal Gurrin, Gareth J. F. Jones, Wessel Kraaij, Hyowon Lee, Vanessa Murdock (Eds.): Advances in Information Retrieval - 33rd European Conference on IR Research, ECIR 2011, Dublin, Ireland, April 18-21, 2011. Proceedings. Springer 2011 Lecture Notes in Computer Science ISBN 978-3-642-20160-8

Keynote Talks

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  Kalervo Järvelin: IR Research: Systems, Interaction, Evaluation and Theories. 1-3
• 
  Evgeniy Gabrilovich: Ad Retrieval Systems in vitro and in vivo: Knowledge-Based Approaches to Computational Advertising. 4-5
• 
  Thorsten Joachims: The Value of User Feedback. 6

Text Categorisation (I)

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  Heung-Seon Oh, Yoonjung Choi, Sung-Hyon Myaeng: Text Classification for a Large-Scale Taxonomy Using Dynamically Mixed Local and Global Models for a Node. 7-18
• 
  Peng Li, Bin Wang, Wei Jin, Yachao Cui: User-Related Tag Expansion for Web Document Clustering. 19-31
• 
  Andrea Addis, Giuliano Armano, Eloisa Vargiu: A Comparative Experimental Assessment of a Threshold Selection Algorithm in Hierarchical Text Categorization. 32-42

Recommender Systems

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  Christian Wartena, Martin Wibbels: Improving Tag-Based Recommendation by Topic Diversification. 43-54
• 
  Jorge Carrillo de Albornoz, Laura Plaza, Pablo Gervás, Alberto Díaz: A Joint Model of Feature Mining and Sentiment Analysis for Product Review Rating. 55-66
• 
  Qiaoling Liu, Eugene Agichtein: Modeling Answerer Behavior in Collaborative Question Answering Systems. 67-79

Web IR (I)

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  Karl Gyllstrom, Marie-Francine Moens: Clash of the Typings - Finding Controversies and Children's Topics Within Queries. 80-91
• 
  Marijn Koolen, Jaap Kamps: Are Semantically Related Links More Effective for Retrieval? 92-103
• 
  Edward Bortnikov, Ronny Lempel, Kolman Vornovitsky: Caching for Realtime Search. 104-116
• 
  Avi Arampatzis, Pavlos Efraimidis, George Drosatos: Enhancing Deniability against Query-Logs. 117-128

IR Evaluation

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  Stephen Robertson: On the Contributions of Topics to System Evaluation. 129-140
• 
  Jaime Arguello, Fernando Diaz, Jamie Callan, Ben Carterette: A Methodology for Evaluating Aggregated Search Results. 141-152
• 
  Omar Alonso, Ricardo A. Baeza-Yates: Design and Implementation of Relevance Assessments Using Crowdsourcing. 153-164
• 
  Gabriella Kazai: In Search of Quality in Crowdsourcing for Search Engine Evaluation. 165-176

IR for Social Networks (I)

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  Hiroya Takamura, Hikaru Yokono, Manabu Okumura: Summarizing a Document Stream. 177-188
• 
  Nitin Chiluka, Nazareno Andrade, Johan A. Pouwelse: A Link Prediction Approach to Recommendations in Large-Scale User-Generated Content Systems. 189-200
• 
  Sheila Kinsella, Alexandre Passant, John G. Breslin: Topic Classification in Social Media Using Metadata from Hyperlinked Objects. 201-206
• 
  Ilija Subasic, Bettina Berendt: Peddling or Creating? Investigating the Role of Twitter in News Reporting. 207-213

Cross-Language IR

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  Yulan He: Latent Sentiment Model for Weakly-Supervised Cross-Lingual Sentiment Classification. 214-225
• 
  Jagadeesh Jagarlamudi, Paul N. Bennett: Fractional Similarity: Cross-Lingual Feature Selection for Search. 226-237
• 
  Ahmed Hefny, Kareem Darwish, Ali Alkahky: Is a Query Worth Translating: Ask the Users! 238-250

IR Theory (I)

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  Katja Hofmann, Shimon Whiteson, Maarten de Rijke: Balancing Exploration and Exploitation in Learning to Rank Online. 251-263
• 
  Tereza Iofciu, Gianluca Demartini, Nick Craswell, Arjen P. de Vries: ReFER: Effective Relevance Feedback for Entity Ranking. 264-276
• 
  Ronan Cummins, Mounia Lalmas, Colm O'Riordan: The Limits of Retrieval Effectiveness. 277-282
• 
  Deyu Zhou, Yulan He: Learning Conditional Random Fields from Unaligned Data for Natural Language Understanding. 283-288

Text Categorisation (II)

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  Radim Rehurek: Subspace Tracking for Latent Semantic Analysis. 289-300
• 
  Alejandro Bellogín, Jun Wang, Pablo Castells: Text Retrieval Methods for Item Ranking in Collaborative Filtering. 301-306
• 
  Nedim Lipka, Benno Stein: Classifying with Co-stems - A New Representation for Information Filtering. 307-313

Multimedia IR

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  Marçal Rusiñol, David Aldavert, Dimosthenis Karatzas, Ricardo Toledo, Josep Lladós: Interactive Trademark Image Retrieval by Fusing Semantic and Visual Content. 314-325
• 
  Avi Arampatzis, Konstantinos Zagoris, Savvas A. Chatzichristofis: Dynamic Two-Stage Image Retrieval from Large Multimodal Databases. 326-337

IR for Social Networks (II)

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  Wayne Xin Zhao, Jing Jiang, Jianshu Weng, Jing He, Ee-Peng Lim, Hongfei Yan, Xiaoming Li: Comparing Twitter and Traditional Media Using Topic Models. 338-349
• 
  Huizhong Duan, Chengxiang Zhai: Exploiting Thread Structures to Improve Smoothing of Language Models for Forum Post Retrieval. 350-361
• 
  Kamran Massoudi, Manos Tsagkias, Maarten de Rijke, Wouter Weerkamp: Incorporating Query Expansion and Quality Indicators in Searching Microblog Posts. 362-367
• 
  Oscar Täckström, Ryan T. McDonald: Discovering Fine-Grained Sentiment with Latent Variable Structured Prediction Models. 368-374

IR Applications

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  Duy Dinh, Lynda Tamine: Combining Global and Local Semantic Contexts for Improving Biomedical Information Retrieval. 375-386
• 
  Jangwon Seo, W. Bruce Croft, Kwang Hyun Kim, Joon Ho Lee: Smoothing Click Counts for Aggregated Vertical Search. 387-398
• 
  Pavel Serdyukov, Mike Taylor, Vishwa Vinay, Matthew Richardson, Ryen W. White: Automatic People Tagging for Expertise Profiling in the Enterprise. 399-410

Text Categorisation (III)

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  Gabriel Dulac-Arnold, Ludovic Denoyer, Patrick Gallinari: Text Classification: A Sequential Reading Approach. 411-423
• 
  Cristina Kadar, José Iria: Domain Adaptation for Text Categorization by Feature Labeling. 424-435

IR for Social Networks (III)

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  Mostafa Keikha, Shima Gerani, Fabio Crestani: TEMPER: A Temporal Relevance Feedback Method. 436-447
• 
  Owen Phelan, Kevin McCarthy, Mike Bennett, Barry Smyth: Terms of a Feather: Content-Based News Recommendation and Discovery Using Twitter. 448-459
• 
  Kelly Y. Itakura, Charles L. A. Clarke, Shlomo Geva, Andrew Trotman, Wei Chi Huang: Topical and Structural Linkage in Wikipedia. 460-465

Web IR (II)

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  Jinyoung Kim, Vitor R. Carvalho: An Analysis of Time-Instability in Web Search Results. 466-478
• 
  Wolfgang Gatterbauer: Rules of Thumb for Information Acquisition from Large and Redundant Data. 479-490
• 
  Suzan Verberne, Lou Boves, Wessel Kraaij: Bringing Why-QA to Web Search. 491-496
• 
  Nick Craswell, Dennis Fetterly, Marc Najork: The Power of Peers. 497-502
• 
  Benno Stein, Matthias Hagen: Introducing the User-over-Ranking Hypothesis. 503-509
• 
  Ismail Sengör Altingövde, Rifat Ozcan, Berkant Barla Cambazoglu, Özgür Ulusoy: Second Chance: A Hybrid Approach for Dynamic Result Caching in Search Engines. 510-516

IR Theory (II)

• 
  Craig Macdonald, Iadh Ounis: Learning Models for Ranking Aggregates. 517-529
• 
  Simon Jonassen, Svein Erik Bratsberg: Efficient Compressed Inverted Index Skipping for Disjunctive Text-Queries. 530-542
• 
  Sree Lekha Thota, Ben Carterette: Within-Document Term-Based Index Pruning with Statistical Hypothesis Testing. 543-554
• 
  Stéphane Campinas, Renaud Delbru, Giovanni Tummarello: SkipBlock: Self-indexing for Block-Based Inverted List. 555-561
• 
  Peng Cai, Wei Gao, Kam-Fai Wong, Aoying Zhou: Weight-Based Boosting Model for Cross-Domain Relevance Ranking Adaptation. 562-567

Interactive IR

• 
  David Elsweiler, Mark Baillie, Ian Ruthven: What Makes Re-finding Information Difficult? A Study of Email Re-finding. 568-579
• 
  Elena Smirnova, Krisztian Balog: A User-Oriented Model for Expert Finding. 580-592
• 
  Feza Baskaya, Heikki Keskustalo, Kalervo Järvelin: Simulating Simple and Fallible Relevance Feedback. 593-604
• 
  M-Dyaa Albakour, Udo Kruschwitz, Nikolaos Nanas, Yunhyong Kim, Dawei Song, Maria Fasli, Anne N. De Roeck: AutoEval: An Evaluation Methodology for Evaluating Query Suggestions Using Query Logs. 605-610
• 
  Christoph Kofler, Martha Larson, Alan Hanjalic: To Seek, Perchance to Fail: Expressions of User Needs in Internet Video Search. 611-616

Question Answering / NLP

• 
  Elif Aktolga, James Allan, David A. Smith: Passage Reranking for Question Answering Using Syntactic Structures and Answer Types. 617-628
• 
  Fei Song, William M. Darling, Adnan Duric, Fred W. Kroon: An Iterative Approach to Text Segmentation. 629-640
• 
  Rama Badrinath, Suresh Venkatasubramaniyan, C. E. Veni Madhavan: Improving Query Focused Summarization Using Look-Ahead Strategy. 641-652
• 
  Chenliang Li, Aixin Sun, Anwitaman Datta: A Generalized Method for Word Sense Disambiguation Based on Wikipedia. 653-664

Posters

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  Raffaele Perego, Fabrizio Silvestri, Nicola Tonellotto: Representing Document Lengths with Identifiers. 665-669
• 
  Kien Tjin-Kam-Jet, Dolf Trieschnigg, Djoerd Hiemstra: Free-Text Search versus Complex Web Forms. 670-674
• 
  Giorgio Maria Di Nunzio, Johannes Leveling, Thomas Mandl: Multilingual Log Analysis: LogCLEF. 675-678
• 
  Jens Kürsten, Maximilian Eibl: A Large-Scale System Evaluation on Component-Level. 679-682
• 
  Walid Magdy, Gareth J. F. Jones: Should MT Systems Be Used as Black Boxes in CLIR? 683-686
• 
  Lei Wang, Dawei Song, Eyad Elyan: Video Retrieval Based on Words-of-Interest Selection. 687-690
• 
  Dolf Trieschnigg, Claudia Hauff: Classic Children's Literature - Difficult to Read? 691-694
• 
  David Leonard, David Lillis, Lusheng Zhang, Fergus Toolan, Rem W. Collier, John Dunnion: Applying Machine Learning Diversity Metrics to Data Fusion in Information Retrieval. 695-698
• 
  Yue Shi, Martha Larson, Alan Hanjalic: Reranking Collaborative Filtering with Multiple Self-contained Modalities. 699-703
• 
  Yue Shi, Martha Larson, Alan Hanjalic: How Far Are We in Trust-Aware Recommendation? 704-707
• 
  Bahjat Safadi, Georges Quénot: Re-ranking for Multimedia Indexing and Retrieval. 708-711
• 
  Benjamin Herbert, György Szarvas, Iryna Gurevych: Combining Query Translation Techniques to Improve Cross-Language Information Retrieval. 712-715
• 
  Guido Zuccon, Leif Azzopardi, Keith van Rijsbergen: Back to the Roots: Mean-Variance Analysis of Relevance Estimations. 716-720
• 
  Xiaozhao Zhao, Peng Zhang, Dawei Song, Yuexian Hou: A Novel Re-ranking Approach Inspired by Quantum Measurement. 721-724
• 
  Walid Magdy, Patrice Lopez, Gareth J. F. Jones: Simple vs. Sophisticated Approaches for Patent Prior-Art Search. 725-728
• 
  David Zellhöfer, Ingo Frommholz, Ingo Schmitt, Mounia Lalmas, Keith van Rijsbergen: Towards Quantum-Based DB+IR Processing Based on the Principle of Polyrepresentation. 729-732
• 
  Nasir Naveed, Sergej Sizov, Steffen Staab: ATTention: Understanding Authors and Topics in Context of Temporal Evolution. 733-737
• 
  Yashar Moshfeghi, Joemon M. Jose: Role of Emotional Features in Collaborative Recommendation. 738-742
• 
  David Buffoni, Sabrina Tollari, Patrick Gallinari: The Importance of the Depth for Text-Image Selection Strategy in Learning-To-Rank. 743-746
• 
  Shima Gerani, Mostafa Keikha, Mark James Carman, Fabio Crestani: Personal Blog Retrieval Using Opinion Features. 747-750
• 
  Ingo Frommholz, Benjamin Piwowarski, Mounia Lalmas, Keith van Rijsbergen: Processing Queries in Session in a Quantum-Inspired IR Framework. 751-754
• 
  Emanuele Di Buccio, Massimo Melucci, Dawei Song: Towards Predicting Relevance Using a Quantum-Like Framework. 755-758
• 
  Avi Arampatzis, Konstantinos Zagoris, Savvas A. Chatzichristofis: Fusion vs. Two-Stage for Multimodal Retrieval. 759-762
• 
  Robert Neumayer, Rudolf Mayer, Kjetil Nørvåg: Combination of Feature Selection Methods for Text Categorisation. 763-766

Demonstrations

• 
  Hector Llorens, Estela Saquete, Borja Navarro, Robert J. Gaizauskas: Time-Surfer: Time-Based Graphical Access to Document Content. 767-771
• 
  Gianluca Demartini: ARES: A Retrieval Engine Based on Sentiments - Sentiment-Based Search Result Annotation and Diversification. 772-775
• 
  Carsten Eickhoff, Tamara Polajnar, Karl Gyllstrom, Sergio Duarte Torres, Richard Glassey: Web Search Query Assistance Functionality for Young Audiences. 776-779
• 
  Matteo Magnani, Danilo Montesi, Gabriele Nunziante, Luca Rossi: Conversation Retrieval from Twitter. 780-783
• 
  John Hannon, Kevin McCarthy, Barry Smyth: Finding Useful Users on Twitter: Twittomender the Followee Recommender. 784-787
• 
  Frans van der Sluis, Sergio Duarte Torres, Djoerd Hiemstra, Betsy van Dijk, Frea Kruisinga: Visual Exploration of Health Information for Children. 788-792