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ISBN: 978-1-60558-164-4 Additional copies may be ordered prepaid from: ACM Order Department PO Box 11405 New York, NY 10286-1405 Phone: 1-800-342-6626 (US and Canada) +1-212-626-0500 (all other countries) Fax: +1-212-944-1318 E-mail: acmhelp@acm.org ACM Order Number 606081 Printed in the USA ii Preface from the General Co-Chairs Welcome to SIGIR 2008 in Singapore! This is the 31st annual meeting of the ACM Special Interest Group in Information Retrieval, and the first time that SIGIR is hosted in Asia. SIGIR is the premier academic conference in information retrieval. With the surge in activities and interests in the Web, the attendance and submission of papers to the conference has grown tremendously over the last few years, with a corresponding rise in the quality and variety of papers. This has allowed us to put together a wide spread of technical sessions covering topics such as ranking, query analysis, filtering, evaluation, summarization, multimedia retrieval and question-answering, as well as emerging topics like web search, social tagging and collaborative filtering. In addition to the main paper sessions, we have a packed schedule with two really interesting plenary keynotes, a full day of tutorials on state-of-the-arts topics, workshops on important emerging topics after the main conference, as well the doctoral consortium, technical demos, and the poster session. SIGIR prides itself as forum where both young and established researchers easily interact to discuss topics and concerns of common interests. To this end, we have also put together a series of social programs including the newcomers breakfast, welcome reception, poster reception, and the conference banquet. We would like to thank our main sponsors, Microsoft, Yahoo!, and Google for their perennial strong support, and to welcome the Information Retrieval Facility as a new SIGIR sponsor. It has really helped us to keep the registration fees affordable in the face of rising costs everywhere. Also, the conference location here in Singapore in 2008 has meant that an unprecedented amount has been spent on student travel support. The chairs and the SIGIR Exco would especially like to thank Amit Singhal, who made a significant donation in honor of Donald B. Crouch; and Microsoft, who directed that a component of their sponsorship package be committed to student travel support in honor of Karen Spärck Jones. The successful organization of a conference of such scales and technical depth would not have been possible without the hard work over the last many months of all the various chairs. We want to thank Doug Oard, Sung Myaeng and Fabrizio Sebastiani and their band of hardworking reviewers in the international program committee, Fabio Crestani, Etfhimis Efthimiadis and Hang Li and their team for posters and demos, Edie Rasmussen and her team for looking after tutorials, Peter Anick and Hwee Tou Ng and their team for workshops, Jian-Yun Nie and his mentors, Noriko Kando and her best paper committee, and, finally, Sue Dumais and Andrew Trotman and their panel of doctoral mentors. Lastly, we'll like to thank all our local organizers, but especially Ee-Peng Lim who was responsible for these proceedings, Min-Yen Kan for the registration, Junhan Zhu for the website. and Mrs Siew Foong Ho, who has been amazing as our conference secretariat and behind-the-scenes organizer. We hope you will find the programs that we have put together at this conference fruitful and thoughtprovoking, and will take the opportunity the conference offers to meet old friends and make new ones, to share and discuss the latest ideas, and to explore Singapore, our culture, and, most especially, our cuisine! Tat-Seng Chua National University of Singapore Singapore Mun-Kew Leong National Library Board Singapore iii Preface from the Program Committee Co-Chairs Welcome to the 31st year of SIGIR, the Annual International ACM SIGIR Conference on Research and Development in Information Retrieval. The growth in SIGIR in recent years has been remarkable. SIGIR 2005 received a record 368 full paper submissions, SIGIR 2006 eclipsed that record with 399 submissions, and SIGIR 2007 exceeded all expectations with 490 submissions. Things stabilized a bit this year, with 497 full paper submissions from 35 countries. Notably, more submissions were received from Pacific Rim countries (182) than from any other region (North America 159, Europe 107, India 31, Middle East 9, South America 7, Africa 2). Of these submissions, we were able to accept 85 full papers (17%). These contributions include many long-standing areas of information retrieval research (e.g., indexing, evaluation, classification, user studies), several topics that have received increasing attention in recent years (e.g., learning to rank, social tagging) and some emerging topics that may inspire more work along similar lines in the future (e.g., collaborative search, sentiment analysis). Along with these full papers, we accepted 99 posters, 11 demonstrations, 9 tutorials and 10 workshops, and 11 Ph.D. candidates were selected to participate in our doctoral consortium. Again this year, the selection of full papers was performed using a two-stage reviewing process. A total of 35 members of the Senior Program Committee (two more than in 2007) were selected based on their expertise, with significant attention to balancing continuity from previous years with addition of new perspectives, and to reflecting the increasingly diverse global scope of the SIGIR membership. The PC co-chairs and Senior PC members nominated more than 400 primary reviewers, 337 of whom accepted our invitation and actually reviewed papers (an 8% increase over the 313 reviewers who performed that critical role for SIGIR 2007). For the first time this year, PC and Senior PC members bid for papers, which were then assigned by the PC chairs based on those bids, the reviewer's stated subject expertise, and avoiding known conflicts of interest. Each paper was assigned to three primary reviewers (which resulted in five papers typically being assigned to a reviewer), and to one Senior PC member (which typically resulted in 14 papers being managed by a Senior PC member). All reviewing was double blind, with the identity of authors known only by the PC chairs during the review process, and with reviewer identities known only by unconflicted members of the PC. The Senior PC member assigned to each paper encouraged reviewers to discuss substantive differences of opinion, they requested additional reviews when needed, they led the discussion of the paper at an in-person PC meeting (at the University of Maryland, March 27-28, 2008) at which final decisions were made, and they produced a metareview for each paper that summarized the basis for the Program Committee's decision. We wish to especially thank the members of the Senior PC for their outstanding work! Similar processes were followed for selection of posters and demonstrations, tutorials, workshops, and doctoral consortium participants. We are grateful to Peter Anick, Fabio Crestani, Susan Dumais, Efthimis Efthimiadis, Hang Li, Hwee Tou Ng, Edie Rasmussen and Andrew Trotman for their leadership of those important selection processes, and to Jian-Yun Nie for his leadership of the mentoring program that serves as an important entry point for researchers who are new to our community. We also wish to thank the SIGIR executive committee for their thoughtful and responsive guidance throughout the process, and to express our appreciation to Ee-Peng Lim, who as Proceedings chair has brought our program together in a form that will make a lasting mark on our field. Finally, we all owe a tremendous debt of gratitude to Tat-Seng Chua and Mun Kew Leong, the conference General Chairs, for their visionary leadership and their adroit management to the myriad of details that have made this first Asian SIGIR conference possible! Syung Hyon Myaeng Information and Communications University Korea Douglas W. Oard University of Maryland, College Park USA Fabrizio Sebastiani Consiglio Nazionale delle Ricerche Italy iv Table of Contents SIGIR 2008 Organization ....................................................................................................................xvii Program Committees ..........................................................................................................................xviii Additional Reviewers ..........................................................................................................................xxiv Sponsors & Supporters ...................................................................................................................xxviii Keynotes · · Delighting Chinese Users: The Google China Experience .............................................................1 Kai-Fu Lee (Google Inc.) Guilt by Association as a Search Principle .........................................................................................2 Limsoon Wong (National University of Singapore) Session 1: User Interaction Models · · · On Iterative Intelligent Medical Search .................................................................................................3 Gang Luo, Chunqiang Tang (IBM T.J. Watson Research Center) Effective and Efficient User Interaction for Long Queries ............................................................11 Giridhar Kumaran (Microsoft Live Laboratories), James Allan (University of Massachusetts Amherst) How Do Users Find Things with PubMed? Towards Automatic Utility Evaluation with User Simulations ............................................................................................19 Jimmy Lin (University of Maryland College Park), Mark D. Smucker (University of Massachusetts Amherst) Session 2: Web Search-1 · Towards Breaking the Quality Curse: A Web-Querying Approach to Web People Search ..............................................................................................................................27 Dmitri V. Kalashnikov, Rabia Nuray-Turan, Sharad Mehrotra (University of California at Irvine) · An Unsupervised Framework for Extracting and Normalizing Product Attributes from Multiple Web Sites ......................................................................................................35 Tak-Lam Wong, Wai Lam, Tik-Shun Wong (The Chinese University of Hong Kong) · Enhancing Web Search by Promoting Multiple Search Engine Use .........................................43 Ryen W. White, Matthew Richardson, Mikhail Bilenko (Microsoft Research), Allison P. Heath (Rice University) Session 3: Evaluation-1 · · Score Standardization for Inter-Collection Comparison of Retrieval Systems ......................51 William Webber, Alistair Moffat, Justin Zobel (The University of Melbourne) The Good and the Bad System: Does the Test Collection Predict Users" Effectiveness? ............................................................................................................................................59 Azzah Al-Maskari, Mark Sanderson, Paul Clough (University of Sheffield), Eija Airio (University of Tampere) · Retrieval Sensitivity Under Training Using Different Measures..................................................67 Ben He, Craig Macdonald, Iadh Ounis (University of Glasgow) Session 4: Collaborative Filtering · · · Attack Resistant Collaborative Filtering.............................................................................................75 Bhaskar Mehta (Google Inc.), Wolfgang Nejdl (L3S Research Center) EigenRank: A Ranking-Oriented Approach to Collaborative Filtering......................................83 Nathan N. Liu, Qiang Yang (Hong Kong University of Science and Technology) Personalized Active Learning for Collaborative Filtering .............................................................91 Abhay S. Harpale, Yiming Yang (Carnegie Mellon University) v Session 5: Learning to Rank-1 · A Boosting Algorithm for Learning Bipartite Ranking Functions with Partially Labeled Data .....................................................................................................................99 Massih-Reza Amini, Tuong-Vinh Truong (Université Pierre et Marie Curie), Cyril Goutte (National Research Council Canada) · Directly Optimizing Evaluation Measures in Learning to Rank.................................................107 Jun Xu, Tie-Yan Liu (Microsoft Research Asia), Min Lu (Nankai University), Hang Li, Wei-Ying Ma (Microsoft Research Asia) · Query Dependent Ranking Using K-Nearest Neighbor................................................................115 Xiubo Geng (Chinese Academy of Sciences), Tie-Yan Liu (Microsoft Research Asia), Tao Qin (Tsinghua University), Andrew Arnold (Carnegie Mellon University), Hang Li (Microsoft Research Asia), Heung-Yeung Shum (Microsoft Corporation) Session 6: High Performance & High Dimensional Indexing · Asymmetric Distance Estimation with Sketches for Similarity Search in High-Dimensional Spaces ................................................................................................................123 Wei Dong, Moses Charikar, Kai Li (Princeton University) · ResIn: A Combination of Results Caching and Index Pruning for High-performance Web Search Engines....................................................................................131 Gleb Skobeltsyn (Ecole Polytechnique Fédérale de Lausanne), Flavio P. Junqueira, Vassilis Plachouras, Ricardo Baeza-Yates (Yahoo! Research) · Reorganizing Compressed Text..........................................................................................................139 Nieves R. Brisaboa, Antonio Farińa, Susana Ladra (University of A Coruńa, Gonzalo Navarro (University of Chile) Session 7: User Adaptation & Personalization · · User Adaptation: Good Results from Poor Systems....................................................................147 Catherine L. Smith, Paul B. Kantor (Rutgers University) Exploring Folksonomy for Personalized Search ...........................................................................155 Shengliang Xu, Shenghua Bao (Shanghai Jiao Tong University), Ben Fei, Zhong Su (IBM China Research Laboratory), Yong Yu (Shanghai Jiao Tong University) · To Personalize or Not to Personalize: Modeling Queries with Variation in User Intent.....163 Jaime Teevan, Susan T. Dumais, Daniel J. Liebling (Microsoft Research) Session 8: Clustering-1 · The Opposite of Smoothing: A Language Model Approach to Ranking Query-Specific Document Clusters .............................................................................171 Oren Kurland (Technion -- Israel Institute of Technology) · Enhancing Text Clustering by Leveraging Wikipedia Semantics.............................................179 Jian Hu (Microsoft Research Asia), Lujun Fang (Fudan University), Yang Cao (Shanghai Jiao Tong Univeristy), Hua-Jun Zeng, Hua Li (Microsoft Research Asia), Qiang Yang (Hong Kong University of Science & Technology), Zheng Chen (Microsoft Research Asia) · Knowledge Transformation from Word Space to Document Space........................................187 Tao Li (Florida International University), Chris Ding (University of Texas at Arlington), Yi Zhang, Bo Shao (Florida International University) Session 9: Multilingual & Crosslingual Retrieval · · · A Study of Learning a Merge Model for Multilingual Information Retrieval ..........................195 Ming-Feng Tsai, Yu-Ting Wang, Hsin-Hsi Chen (National Taiwan University) Bilingual Topic Aspect Classification with A Few Training Examples....................................203 Yejun Wu, Douglas W. Oard (University of Maryland College Park) Crosslingual Location Search .............................................................................................................211 Tanuja Joshi, Joseph Joy, Tobias Kellner (Microsoft Research India), Udayan Khurana (Microsoft India R&D), A. Kumaran, Vibhuti Sengar (Microsoft Research India) vi Session 10: Relevance Feedback · · · A Study of Methods for Negative Relevance Feedback.................................................................. 219 Xuanhui Wang, Hui Fang (Ohio State University), ChengXiang Zhai (University of Illinois at Urbana-Champaign) A Bayesian Logistic Regression Model for Active Relevance Feedback.................................. 227 Zuobing Xu, Ram Akella (University of California at Santa Cruz) A Cluster-Based Resampling Method for Pseudo-Relevance Feedback .................................. 235 Kyung Soon Lee (Chonbuk National University), W. Bruce Croft, James Allan (University of Massachusetts Amherst) · Selecting Good Expansion Terms for Pseudo-Relevance Feedback......................................... 243 Guihong Cao, Jian-Yun Nie (University of Montreal), Jianfeng Gao (Microsoft Research), Stephen Robertson (Microsoft Research at Cambridge) Session 11: Learning to Rank-2 · · · Learning to Rank with Partially-Labeled Data.................................................................................251 Kevin Duh, Katrin Kirchhoff (University of Washington) Learning to Rank with SoftRank and Gaussian Processes........................................................259 John Guiver, Edward Snelson (Microsoft Research Limited) Learning to Rank at Query-Time using Association Rules.........................................................267 Adriano A. Veloso, Humberto M. Almeida, Marcos A. Gonçalves, Wagner Meira Jr (Federal University of Minas Gerais) · Learning to Rank with Ties ...................................................................................................................275 Ke Zhou, Gui-Rong Xue (Shanghai Jiao-Tong University), Hongyuan Zha (Georgia Institute of Technology), Yong Yu (Shanghai Jiao-Tong University) Session 12: Summarization · Query-Sensitive Mutual Reinforcement Chain and Its Application in Query-Oriented Multi-Document Summarization......................................................................283 Furu Wei (The Hong Kong Polytechnic University and Wuhan University), Wenjie Li, Qin Lu (The Hong Kong Polytechnic University), Yanxiang He (Wuhan University) · Comments-Oriented Document Summarization: Understanding Documents with Readers' Feedback ...................................................................291 Meishan Hu, Aixin Sun, Ee-Peng Lim (Nanyang Technological University) · · Multi-Document Summarization Using Cluster-Based Link Analysis .....................................299 Xiaojun Wan, Jianwu Yang (Peking University) Multi-Document Summarization via Sentence-Level Semantic Analysis and Symmetric Matrix Factorization ................................................................................307 Dingding Wang, Tao Li (Florida International University), Shenghuo Zhu (NEC Labs. America, Inc), Chris Ding (University of Texas at Arlington) Session 13: Exploratory Search & Filtering · Algorithmic Mediation for Collaborative Exploratory Search ....................................................315 Jeremy Pickens, Gene Golovchinsky (FX Palo Alto Laboratory, Inc.), Chirag Shah (University of North Carolina), Pernilla Qvarfordt, Maribeth Back (FX Palo Alto Laboratory, Inc.) · Exploiting Correlated Keywords to Improve Approximate Information Filtering ................323 Christian Zimmer, Christos Tryfonopoulos, Gerhard Weikum (Max-Planck Institut for Informatics) Session 14: Web Search-2 · · · A User Browsing Model to Predict Search Engine Click Data from Past Observations....331 Georges E. Dupret, Benjamin Piwowarski (Yahoo! Research Latin America) Learning Query Intent from Regularized Click Graphs................................................................339 Xiao Li, Ye-Yi Wang, Alex Acero (Microsoft Research) Retrieval and Feedback Models for Blog Feed Search ................................................................347 Jonathan L. Elsas, Jaime Arguello, Jamie Callan, Jaime G. Carbonell (Carnegie Mellon University) vii Session 15: Multimedia Retrieval · Learning to Reduce the Semantic Gap in Web Image Retrieval and Annotation ................355 Changhu Wang (University of Science and Technology of China), Lei Zhang (Microsoft Research Asia), Hong-Jiang Zhang (Microsoft Advanced Technology Center) · A Lattice-Based Approach to Query-by-Example Spoken Document Retrieval ..................363 Tee Kiah Chia (National University of Singpaore), Khe Chai Sim, Haizhou Li (Institute for Infocomm Research), Hwee Tou Ng (National University of Singapore) Session 16: Query Analysis & Models-1 · · A Few Examples Go A Long Way .......................................................................................................371 Krisztian Balog, Wouter Weerkamp, Maarten de Rijke (University of Amsterdam) A Unified and Discriminative Model for Query Refinement........................................................379 Jiafeng Guo (Institute of Computing Technology, CAS), Gu Xu, Hang Li (Microsoft Research Asia), Xueqi Cheng (Institute of Computing Technology, CAS) · Query Expansion Using Gaze-Based Feedback on the Subdocument Level .......................387 Georg Buscher, Andreas Dengel, Ludger van Elst (University of Kaiserslautern) Session 17: Non-Topicality · Affective Feedback: An Investigation into the Role of Emotions in the Information Seeking Process...................................................................................................395 Ioannis Arapakis, Joemon M. Jose, Philip D. Gray (University of Glasgow) · Optimizing Relevance and Revenue in Ad Search: A Query Substitution Approach ........403 Filip Radlinski (Cornell University), Andrei Broder, Peter Ciccolo, Evgeniy Gabrilovich, Vanja Josifovski, Lance Riedel (Yahoo! Research) · A Generation Model to Unify Topic Relevance and Lexicon-based Sentiment for Opinion Retrieval..........................................................................................................411 Min Zhang, Xingyao Ye (Tsinghua University) Session 18: Probabilistic Models · · Discriminative Probabilistic Models for Passage Based Retrieval ..........................................419 Mengqiu Wang (Stanford University), Luo Si (Purdue University) A New Probabilistic Retrieval Model Based on the Dirichlet Compound Multinomial Distribution..................................................................................................427 Zuobing Xu, Ram Akella (University of California at Santa Cruz) · TF-IDF Uncovered: A Study of Theories and Probabilities.........................................................435 Thomas Roelleke, Jun Wang (University of London) Session 19: Analysis of Social Networks · · Separate and Inequal: Preserving Heterogeneity in Topical Authority Flows......................443 Lan Nie, Brian D. Davison (Lehigh University) BrowseRank: Letting Web Users Vote for Page Importance .....................................................451 Yuting Liu (Beijing Jiaotong University), Bin Gao, Tie-Yan Liu (Microsoft Research Asia), Ying Zhang (Nankai University), Zhiming Ma (Chinese Academy of Sciences), Shuyuan He (Peking University), Hang Li (Microsoft Research Asia) · Exploring Traversal Strategy for Web Forum Crawling...............................................................459 Yida Wang (Chinese Academy of Sciences), Jiang-Ming Yang, Wei Lai, Rui Cai, Lei Zhang, Wei-Ying Ma (Microsoft Research Asia) Session 20: Question-Answering · Finding Question-Answer Pairs from Online Forums ..................................................................467 Gao Cong (Aalborg University), Long Wang (Tianjin University), Chin-Yew Lin (Microsoft Research Asia), Young-In Song (Korea University), Yueheng Sun (Tianjin University) viii · Retrieval Models for Question and Answer Archives ..................................................................475 Xiaobing Xue (University of Massachusetts at Amherst), Jiwoon Jeon (Google, Inc.), W. Bruce Croft (University of Massachusetts at Amherst) · Predicting Information Seeker Satisfaction in Community Question Answering ...............483 Yandong Liu (Emory University), Jiang Bian (Georgia Institute of Technology), Eugene Agichtein (Emory University) Session 21: Query Analysis & Models-2 · · · Discovering Key Concepts in Verbose Queries.............................................................................491 Michael Bendersky, W. Bruce Croft (University of Massachusetts) Ambiguous Queries: Test Collections Need More Sense...........................................................499 Mark Sanderson (University of Sheffield) Automatically Identifying Localizable Queries ...............................................................................507 Michael J. Welch, Junghoo Cho (University of California at Los Angeles) Session 22: Social Tagging · Real-time Automatic Tag Recommendation....................................................................................515 Yang Song (The Pennsylvania State University), Ziming Zhuang (Yahoo! Applied Research), Huajing Li (The Pennsylvania State University), Qiankun Zhao (AOL Research Laboratory), Jia Li, Wang-Chien Lee, C. Lee Giles (The Pennsylvania State University) · Efficient Top-k Querying over Social-Tagging Networks............................................................523 Ralf Schenkel, Tom Crecelius, Mouna Kacimi (Max-Planck-Institut für Informatik), Sebastian Michel (École Polytechnique Fédérale de Lausanne), Thomas Neumann, Josiane X. Parreira, Gerhard Weikum (Max-Planck-Institut für Informatik) · Social Tag Prediction..............................................................................................................................531 Paul Heymann, Daniel Ramage, Hector Garcia-Molina (Stanford University) Session 23: Clustering-2 · Spectral Geometry for Simultaneously Clustering and Ranking Query Search Results..........................................................................................................................................539 Ying Liu, Wenyuan Li, Yongjing Lin, Liping Jing (University of Texas at Dallas) · · A Rank-Aggregation Approach to Searching for Optimal Query-Specific Clusters ...........547 Oren Kurland, Carmel Domshlak (Technion -- Israel Institute of Technology) A Comparative Evaluation of Different Link Types on Enhancing Document Clustering..............................................................................................................................555 Xiaodan Zhang, Xiaohua Hu, Xiaohua Zhou (Drexel University) Session 24: Content Analysis · · · SpotSigs: Robust and Efficient Near Duplicate Detection in Large Web Collections........563 Martin Theobald, Jonathan Siddharth, Andreas Paepcke (Stanford University) Local Text Reuse Detection..................................................................................................................571 Jangwon Seo, W. Bruce Croft (University of Massachusetts at Amherst) TSCAN: A Novel Method for Topic Summarization and Content Anatomy...........................579 Chien Chin Chen (National Taiwan University), Meng Chang Chen (Academia Sinica) Session 25: Learning Models for IR · A New Rank Correlation Coefficient for Information Retrieval..................................................587 Emine Yilmaz (Microsoft Research), Javed A. Aslam (Northeastern University), Stephen Robertson (Microsoft Research) · Learning from Labeled Features using Generalized Expectation Criteria.............................595 Gregory Druck (University of Massachusetts), Gideon Mann (Google, Inc.), Andrew McCallum (University of Massachusetts) ix · · A Simple and Efficient Sampling Method for Estimating AP and NDCG................................603 Emine Yilmaz (Microsoft Research), Evangelos Kanoulas, Javed A. Aslam (Northeastern University) A General Optimization Framework for Smoothing Language Models on Graph Structures ...............................................................................................................................611 Qiaozhu Mei, Duo Zhang, ChengXiang Zhai (University of Illinois at Urbana-Champaign) Session 26: Text Classification · Deep Classification in Large-scale Text Hierarchies....................................................................619 Gui-Rong Xue, Dikan Xing (Shanghai Jiao-Tong University), Qiang Yang (Hong Kong University of Science and Technology), Yong Yu (Shanghai Jiao-Tong University) · Topic-bridged PLSA for Cross-Domain Text Classification .......................................................627 Gui-Rong Xue, Wenyuan Dai (Shanghai Jiao Tong University), Qiang Yang (Hong Kong University of Science and Technology), Yong Yu (Shanghai Jiao Tong University) · Non-greedy Active Learning for Text Categorization using Convex Transductive Experimental Design ........................................................................635 Kai Yu, Shenghuo Zhu, Wei Xu, Yihong Gong (NEC Laboratories America) · Classifiers Without Borders: Incorporating Fielded Text From Neighboring Web Pages ........................................................................................................................643 Xiaoguang Qi, Brian D. Davison (Lehigh University) Session 27: Evaluation-2 · Evaluation Over Thousands of Queries............................................................................................651 Ben Carterette (University of Massachusetts Amherst), Virgil Pavlu, Evangelos Kanoulas, Javed A. Aslam (Northeastern University), James Allan (University of Massachusetts Amherst) · Novelty and Diversity in Information Retrieval Evaluation .........................................................659 Charles L. A. Clarke, Maheedhar Kolla, Gordon V. Cormack, Olga Vechtomova, Azin Ashkan, Stefan Büttcher, Ian MacKinnon (University of Waterloo) · Relevance Assessment: Are Judges Exchangeable and Does it Matter................................667 Peter Bailey, Nick Craswell (Microsoft), Ian Soboroff (NIST), Paul Thomas (CSIRO ICT Centre), Arjen P. de Vries (CWI), Emine Yilmaz (Microsoft Research) · Intuition-Supporting Visualization of User's Performance Based on Explicit Negative Higher-Order Relevance ................................................................................675 Heikki Keskustalo, Kalervo Järvelin, Ari Pirkola, Jaana Kekäläinen (University of Tampere) Posters Group 1: Evaluation, Text Collections and User/Personalized IR · · · · · · · Relevance Judgments between TREC and Non-TREC Assessors ..........................................683 Azzah Al-Maskari, Mark Sanderson, Paul Clough (University of Sheffield) Evaluation Measures for Preference Judgments...........................................................................685 Ben Carterette (University of Massachusetts Amherst), Paul N. Bennett (Microsoft Research) Exploring Evaluation Metrics: GMAP versus MAP........................................................................687 Sri Devi Ravana, Alistair Moffat (The University of Melbourne) A new interpretation of average precision.......................................................................................689 Stephen Robertson (Microsoft Research) Comparing Metrics across TREC and NTCIR:The Robustness to Pool Depth Bias...........691 Tetsuya Sakai (NewsWatch, Inc.) Relevance Thresholds in System Evaluations ...............................................................................693 Falk Scholer, Andrew Turpin (RMIT University) Precision-At-Ten Considered Redundant ........................................................................................695 William Webber, Alistair Moffat, Justin Zobel (The University of Melbourne), Tetsuya Sakai (Newswatch, Inc., Japan) x · · Structuring Collections with Scatter/Gather Extensions ............................................................697 Omar Alonso (University of California at Davis), Justin Talbot (Stanford University) Text Collections for FIRE.......................................................................................................................699 Prasenjit Majumder, Mandar Mitra, Dipasree Pal, Ayan Bandyopadhyay, Samaresh Maiti, Sukanya Mitra, Aparajita Sen, Sukomal Pal (Indian Statistical Institute) · · · A Longitudinal Study of Real-time Search Assistance Adoption .............................................701 Peter Anick, Raj Gopal Kantamneni (Yahoo!) TopicRank: Bringing Insight to Users...............................................................................................703 Ivan Berlocher, Kyung-il Lee, Kono Kim (Saltlux Inc.) Talking the Talk vs. Walking the Walk: Salience of Information Needs in Querying vs. Browsing ........................................................................................................705 Mikhail Bilenko, Ryen W. White, Matthew Richardson (Microsoft Research), G. Craig Murray (University of Maryland) · · · · · · · · Exploring Mouse Movements for Inferring Query Intent .............................................................707 Qi Guo, Eugene Agichtein (Emory University) Emulating Query-Biased Summaries Using Document Titles ...................................................709 Hideo Joho, David Hannah, Joemon M. Jose (University of Glasgow) Hierarchical Naive Bayes Models for Representing User Profiles ...........................................711 Juan F. Huete, Luis M. de Campos, J. M. Fernández-Luna, M. A. Rueda-Morales (University of Granada) A Topical PageRank Based Algorithm for Recommender Systems........................................713 Liyan Zhang, Kai Zhang, Chunping Li (Tsinghua University) The Impact of History Length on Personalized Search ...............................................................715 Yangbo Zhu, Jamie Callan, Jaime Carbonell (Carnegie Mellon University) User Preference Choices for Complex Question Answering.....................................................717 Mingfang Wu, Falk Scholer, Andrew Turpin (RMIT University) Towards Personalized Distributed Information Retrieval ...........................................................719 Mark J. T. Carman, Fabio Crestani (University of Lugano) Task-aware Search Personalization...................................................................................................721 Julia Luxenburger, Shady Elbassuoni, Gerhard Weikum (Max-Planck Institute of Informatics) Posters Group 2: Blog, Tagging, Opinion Analysis and Web IR · · · · · · Personal vs Non-Personal Blogs: Initial Classification Experiments......................................723 Erik Elgersma, Maarten de Rijke (University of Amsterdam) Exploiting Subjectivity Analysis in Blogs to Improve Political Leaning Categorization ...725 Maojin Jiang, Shlomo Argamon (Illinois Institute of Technology) Ranking Opinionated Blog Posts using OpinionFinder ..............................................................727 Ben He, Craig Macdonald, Iadh Ounis (University of Glasgow) Searching Blogs and News: A Study on Popular Queries..........................................................729 Aixin Sun, Meishan Hu, Ee-Peng Lim (Nanyang Technological University) Aggregated Click-through Data in a Homogeneous User Community ...................................731 Mingfang Wu, Andrew Turpin, Justin Zobel (RMIT University) To Tag or Not to Tag ­ Harvesting Adjacent Metadata in Large-Scale Tagging Systems ........................................................................................................733 Adriana Budura, Sebastian Michel (EPFL), Philippe Cudré-Mauroux (Massachusetts Institute of Technology), Karl Aberer (EPFL) · Exploring Question Subjectivity Prediction in Community QA.................................................735 Baoli Li, Yandong Liu (Emory University), Ashwin Ram (Georgia Institute of Technology), Ernest V. Garcia, Eugene Agichtein (Emory University) · On the Evolution of the Yahoo! Answers QA Community ..........................................................737 Yandong Liu, Eugene Agichtein (Emory University) xi · Detecting Synonyms in Social Tagging Systems to Improve Content Retrieval.................739 Maarten Clements (Delft University of Technology), Arjen P. de Vries (CWI), Marcel J. T. Reinders (Delft University of Technology) · · SOPING: A Chinese Customer Review Mining System ...............................................................741 Chao Zhou, Guang Qiu, Kangmiao Liu, Jiajun Bu, Mingcheng Qu, Chun Chen (Zhejiang University) Combining Learn-based and Lexicon-based Techniques for Sentiment Detection without Using Labeled Examples .......................................................................................................743 Songbo Tan (Chinese Academy of Sciences), Yuefen Wang (Chinese Academy of Geological Sciences), Xueqi Cheng (Chinese Academy of Sciences) · · · Semi-supervised Spam Filtering: Does it Work?...........................................................................745 Mona Mojdeh, Gordon V. Cormack (University of Waterloo) Limits of Opinion-Finding Baseline Systems .................................................................................747 Craig Macdonald, Ben He, Iadh Ounis (University of Glasgow), Ian Soboroff (NIST) Web Query Translation via Web Log Mining...................................................................................749 Rong Hu (Huazhong University of Science and Technology), Weizhu Chen, Peng Bai (Microsoft Research Asia), Yansheng Lu (Huazhong University of Science and Technology), Zheng Chen (Microsoft Research Asia), Qiang Yang (Hong Kong University of Science and Technology) · · · · Analyzing Web Text Association to Disambiguate Abbreviation in Queries ........................751 Xing Wei, Fuchun Peng, Benoit Dumoulin (Yahoo! Inc.) Bloggers as Experts: Feed Distillation using Expert Retrieval Models ..................................753 Krisztian Balog, Maarten de Rijke, Wouter Weerkamp (University of Amsterdam) Search Effectiveness with a Breadth-First Crawl ..........................................................................755 Dennis Fetterly, Nick Craswell, Vishwa Vinay (Microsoft Research) Guide Focused Crawler Efficiently and Effectively Using On-line Topical Importance Estimation ..................................................................................................................................................757 Ziyu Guan, Can Wang, Chun Chen, Jiajun Bu, Junfeng Wang (Zhejiang University) · Web Page Retrieval in Ubiquitous Sensor Environments...........................................................759 Takuya Maekawa, Yutaka Yanagisawa, Yasushi Sakurai, Yasue Kishino, Koji Kamei, Takeshi Okadome (NTT Communication Science Laboratories) · · Automatic Document Prior Feature Selection for Web Retrieval .............................................761 Jie Peng, Craig Macdonald, Iadh Ounis (University of Glasgow) Using Parsimonious Language Models on Web Data..................................................................763 Rianne Kaptein (University of Amsterdam), Rongmei Li, Djoerd Hiemstra (University of Twente), Jaap Kamps (University of Amsterdam) · Query Preprocessing: Improving Web Search Through a Vietnamese Word Tokenization Approach..........................................................................................................................765 Doan Nguyen (Hewlett-Packard Company) Posters Group 3: Multimedia and Domain Specific IR · · · · · · AdImage: Video Advertising by Image Matching and Ad Scheduling Optimization...........767 Wei-Shing Liao, Kuan-Ting Chen, Winston H. Hsu (National Taiwan University) Bag-of-Visual-Words Expansion Using Visual Relatedness for Video Indexing .................769 Yu-Gang Jiang, Chong-Wah Ngo (City University of Hong Kong) A Word Shape Coding Method for Camera-based Document Images....................................771 Linlin Li, Chew Lim Tan (National University of Singapore) Term Clouds as Surrogates for User Generated Speech............................................................773 Manos Tsagias, Martha Larson, Maarten de Rijke (University of Amsterdam) A Faceted Interface for Multimedia Search......................................................................................775 Robert Villa, Nicholas Gildea, Joemon M. Jose (Glasgow University) WISA: A Novel Web Image Semantic Analysis System ...............................................................777 Hongtao Xu, Xiangdong Zhou (Fudan University), Lan Lin (Tongji University) xii · One-button Search Extracts Wider Interests: An Empirical Study with Video Bookmarking Search ..............................................................................................................................779 Masayuki Okamoto, Masaaki Kikuchi, Tomohiro Yamasaki (Toshiba Corporation) · Product Retrieval for Grocery Stores ................................................................................................781 Petteri Nurmi, Eemil Lagerspetz (University of Helsinki), Wray Buntine (National ICT Australia), Patrik Floréen, Joonas Kukkonen (University of Helsinki) · · · A Reranking Model for Genomics Aspect Search .........................................................................783 Qinmin Hu, Xiangji Huang (York University) Improving Biomedical Document Retrieval using Domain Knowledge..................................785 Shuguang Wang, Milos Hauskrecht (University of Pittsburgh) Kleio: A Knowledge-enriched Information Retrieval System for Biology ..............................787 Chikashi Nobata, Philip Cotter (The University of Manchester & National Centre for Text Mining), Naoaki Okazaki (The University of Tokyo), Brian Rea (The University of Manchester & National Centre for Text Mining), Yutaka Sasaki, Yoshimasa Tsuruoka (The University of Manchester), Jun'ichi Tsujii (The University of Manchester, National Centre for Text Mining, & The University of Tokyo), Sophia Ananiadou (The University of Manchester & National Centre for Text Mining) · Enhancing Keyword-Based Botanical Information Retrieval with Information Extraction ...................................................................................................................................................789 Xiaoya Tang (Emporia State University) · · · · · How Medical Expertise Influences Web Search Interaction.......................................................791 Ryen W. White, Susan Dumais, Jaime Teevan (Microsoft Corporation) Generating Diverse Katakana Variants Based on Phonemic Mapping...................................793 Kazuhiro Seki (Kobe University), Hiroyuki Hattori (Google Inc.), Kuniaki Uehara (Kobe University) Exploiting Sequential Dependencies for Expert Finding ............................................................795 Pavel Serdyukov, Henning Rode, Djoerd Hiemstra (University of Twente) Modeling Expert Finding as an Absorbing Random Walk ..........................................................797 Pavel Serdyukov, Henning Rode, Djoerd Hiemstra (University of Twente) A Scalable Assistant Librarian: Hierarchical Subject Classification of Books ....................799 Steven P. Crain (Georgia Institute of Technology), Jian Huang (The Pennsylvania State University), Hongyuan Zha (Georgia Institute of Technology) · Information Retrieval on Bug Locations by Learning Co-located Bug Report Clusters ...801 Ing-Xiang Chen (Yuan Ze University), Hojun Jaygarl (Iowa State University), Cheng-Zen Yang, Ping-Jung Wu (Yuan Ze University) · Summarization of Compressed Text Images: An Experience on Indic Script Documents ...................................................................................................................803 Utpal Garain (Indian Statistical Institute) Posters Group 4: Theory and IR Models · A Method for Transferring Retrieval Scores Between Collections with Non-Overlapping Vocabularies ..................................................................................................805 Fernando D. Diaz (Yahoo! Inc.) · · Improving Relevance Feedback in Language Modeling with Score Regularization...........807 Fernando D. Diaz (Yahoo! Inc.) Theoretical Bounds On and Empirical Robustness of Score Regularization to Different Similarity Measures..........................................................................................................809 Fernando D. Diaz (Yahoo! Inc.) · · A Study of Query Length.......................................................................................................................811 Avi Arampatzis, Jaap Kamps (University of Amsterdam) "Don't Have a Stemmer? Be Un+concern+ed"...............................................................................813 Paul McNamee (Johns Hopkins University), Charles Nicholas (University of Maryland Baltimore County), James Mayfield (Johns Hopkins University) xiii · Parsimonious Concept Modeling .......................................................................................................815 Edgar Meij (University of Amsterdam), Dolf Trieschnigg (University of Twente), Maarten de Rijke (University of Amsterdam), Wessel Kraaij (TNO ICT) · · · Parsimonious Relevance Models .......................................................................................................817 Edgar Meij, Wouter Weerkamp, Krisztian Balog, Maarten de Rijke (University of Amsterdam) Author-Topic Evolution Analysis using Three-way Non-negativeParatucker ......................819 Wei Peng, Tao Li (Florida International University) Exploiting Proximity Feature in Bigram Language Model for Information Retrieval..........821 Seung-Hoon Na, Jungi Kim (Pohang University of Science and Technology), In-Su Kang (Kyungsung University), Jong-Hyeok Lee (Pohang University of Science and Technology) · Measuring Concept Relatedness Using Language Models........................................................823 Dolf Trieschnigg (University of Twente), Edgar Meij, Maarten de Rijke (University of Amsterdam), Wessel Kraaij (TNO ICT) · · Query-Drift Prevention for Robust Query Expansion...................................................................825 Liron Zighelnic, Oren Kurland (Technion - Israel Institute of Technology) Adaptive Label-Driven Scaling for Latent Semantic Indexing ...................................................827 Xiaojun Quan, Enhong Chen, Qiming Luo (University of Science and Technology of China), Hui Xiong (Rutgers University) · · Fixed-threshold SMO for Joint Constraint Learning Algorithm of Structural SVM.............829 Changki Lee, HyunKi Kim, Myung-Gil Jang (Electronics and Telecommunications Research Institute) Posterior Probabilistic Clustering using NMF ................................................................................831 Chris Ding (University of Texas at Arlington), Tao Li (Florida International University), Dijun Luo (University of Texas at Arlington), Wei Peng (Florida International University) · · · · · On Document Splitting in Passage Detection.................................................................................833 Nazli Goharian, Saket S. R. Mengle (Illinois Institute of Technology) Learning with Support Vector Machines for Query-By-Multiple-Examples...........................835 Dell Zhang (University of London), Wee Sun Lee (National University of Singapore) Question Classification with Semantic Tree Kernel .....................................................................837 Yan Pan, Yong Tang, Luxin Lin, Yemin Luo (Sun Yat-sen University) Generalising Multiple Capture-Recapture to Non-Uniform Sample Sizes..............................839 Paul Thomas (CSIRO ICT Centre) Predicting when Browsing Context Is Relevant to Search.........................................................841 Mandar Rahurkar (Univeristy of Illinois at Urbana Champaign), Silviu Cucerzan (Microsoft Research) Posters Group 5: Structured IR, Ranking, Classification and Filtering · · · · · · · · XML-Aided Phrase Indexing for Hypertext Documents ...............................................................843 Miro Lehtonen (University of Helsinki), Antoine Doucet (University of Caen) Proximity-Aware Scoring for XML Retrieval....................................................................................845 Andreas Broschart, Ralf Schenkel (Max-Planck-Institut für Informatik) Locating Relevant Text within XML Documents ............................................................................847 Jaap Kamps, Marijn Koolen (University of Amsterdam), Mounia Lalmas (University of London) A Flexible Extension of XPath to improve XML Querying...........................................................849 Ernesto Damiani, Stefania Marrara (University of Milan), Gabriella Pasi (University of Milan Bicocca) Combining Document- and Paragraph-Based Entity Ranking ..................................................851 Henning Rode, Pavel Serdyukov, Djoerd Hiemstra (University of Twente) Re-Ranking Search Results Using Document-Passage Graphs...............................................853 Michael Bendersky (University of Massachusetts), Oren Kurland (Technion - Israel Institute of Technology) Utilizing Phrase Based Semantic Information for Term Dependency .....................................855 Yang Xu, Fan Ding, Bin Wang (Chinese Academy of Sciences) Inferring the Most Important Types of a Query: A Semantic Approach .................................857 David Vallet (Universidad Autnoma de Madrid), Hugo Zaragoza (Yahoo! Research Barcelona) xiv · On Multiword Entity Ranking in Peer-to-Peer Search ..................................................................859 Yuval Merhav (Illinois Institute of Technology), Ophir Frieder (Georgetown University and IIT Information Retrieval Laboratory) · · · Site-Based Dynamic Pruning for Query Processing in Search Engines ................................861 Ismail Sengor Altingovde, Engin Demir, Fazli Can, Özgür Ulusoy (Bilkent University) Exploiting MDS Projections for Cross-language IR......................................................................863 Rafael E. Banchs, Andreas Kaltenbrunner (Barcelona Media - Innovation Centre) Local Approximation of PageRank and Reverse PageRank ......................................................865 Ziv Bar-Yossef (Technion - Israel Institute of Technology and Google Haifa Engineering Center), Li-Tal Mashiach (Technion - Israel Institute of Technology) · Improving Text Classification Accuracy using Topic Modeling over an Additional Corpus ....................................................................................................................867 Somnath Banerjee (Hewlett-Packard Labs India) · · An Algorithm for Text Categorization................................................................................................869 Anestis Gkanogiannis, Theodore Kalamboukis (Athens University of Economics and Business) Hypergraph Partitioning for Document Clustering: A Unified Clique Perspective .............871 Tianming Hu (East China Normal University & Dong Guan University of Technology), Hui Xiong, Wenjun Zhou (Rutgers University), Sam Yuan Sung (South Texas College), Hangzai Luo (East China Normal University) · PageRank Based Clustering of Hypertext Document Collections ...........................................873 Konstantin Avrachenkov (INRIA Sophia Antipolis), Vladimir Dobrynin (St. Petersburg State University), Danil Nemirovsky (INRIA and St. Petersburg State University), Son Kim Pham (University of California at San Diego), Elena Smirnova (St. Petersburg State University) · · An Alignment-based Pattern Representation Model for Information Extraction .................875 Seokhwan Kim, Minwoo Jeong, Gary Geunbae Lee (Pohang University of Science and Technology) Relational Distance-Based Collaborative Filtering........................................................................877 Wei Zhang (Digital China Postdoctoral Research Workstation of Haidian Park of Beijing Zhongguancun Science Park) Demonstrations · MINEXml: Bridging Unstructured Query with Structured Resources via Mediated Query..................................................................................................................................879 Gan Keng Hoon (Universiti Sains Malaysia and Universiti Malaya), Phang Keat Keong (Universiti Malaya), Saravadee Sae Tan (Universiti Sains Malaysia), Tang Enya Kong (Multimedia University) · · · Clustering Search Results for Mobile Terminals ...........................................................................880 Michiko Yasukawa, Hidetoshi Yokoo (Gunma University) Refining Search Results with Facet Landscapes ..........................................................................881 Mark Sifer, Jian Lin (University of Wollongong) ICE-TEA: an Interactive Cross-language Search Engine with Translation Enhancement............................................................................................................882 Dan Wu (Wuhan University), Daqing He (University of Pittsburgh) · · Cross-Lingual Search over 22 European Languages...................................................................883 Blaz Fortuna, Jan Rupnik, Bostjan Pajntar, Marko Grobelnik, Dunja Mladenic (Institute Jozef Stefan) Social Recommendations at Work .....................................................................................................884 Tom Crecelius, Mouna Kacimi (Max-Planck-Institut für Informatik), Sebastian Michel (École Polytechnique Fédérale de Lausanne), Thomas Neumann, Josiane X. Parreira, Ralf Schenkel, Gerhard Weikum (Max-Planck-Institut für Informatik) · Bilkent News Portal: A Personalizable System with New Event Detection and Tracking Capabilities..................................................................................................885 Fazli Can, Seyit Kocberber, Ozgur Baglioglu, Suleyman Kardas, Huseyin Cagdas Ocalan, Erkan Uyar (Bilkent University) · Geographic IR and Visualization in Time and Space....................................................................886 Ray R. Larson (University of California at Berkeley) xv · · Fine-Grained Relevance Feedback for XML Retrieval..................................................................887 Hanglin Pan, Ralf Schenkel, Gerhard Weikum (Max-Planck-Institut für Informatik) Dynamic Visualization of Music Classification Systems.............................................................888 Kris West (University of East Anglia), J. Stephen Downie, Xiao Hu (University of Illinois at Urbana-Champaign), M. Cameron Jones (Yahoo! Research) · From Concepts to Implementation and Visualization: Tools from a Team-Based Approach to IR ............................................................................................................................................. 889 Uma Murthy (Virginia Polytechic Institute & State University), Ricardo da Silva Torres (University of Campinas), Edward A. Fox, Logambigai Venkatachalam, Seungwon Yang (Virginia Polytechic Institute & State University), Marcos A. Gonçalves (Federal University of Minas Gerais) Doctoral Consortiums · · Exploiting XML Structure to Improve Information Retrieval in Peer-to-Peer Systems ......890 Judith Winter (J.W. Goethe-University) Affective Feedback: An Investigation into the Role of Emotions in the Information Seeking Process ......................................................................................................................................891 Ioannis Arapakis (University of Glasgow) · · · · Exploring and Measuring Dependency Trees for Information Retrieval ................................892 Chang Liu (University of Ulster) The Search for Expertise: to the Documents and Beyond .........................................................893 Pavel Serdyukov (University of Twente) Task Detection for Activity-Based Desktop Search......................................................................894 Sergey Chernov (University of Hannover) Using a Mediated Query Approach for Matching Unstructured Query with Structured Resources ...................................................................................................................895 Gan Keng Hoon (Universiti Malaya) · Understanding System Implementation and User Behavior in a Collaborative Information Seeking Environment......................................................................................................896 Chirag Shah (University of North Carolina at Chapel Hill) · · · · Biomedical Cross-Language Information Retrieval......................................................................897 Dolf Trieschnigg (University of Twente) Towards a Combined Model for Search and Navigation of Annotated Documents ...........898 Edgar Meij (University of Amsterdam) Context and Linking in Retrieval from Personal Digital Archives ............................................899 Liadh Kelly (Dublin City University) Extending Language Modeling Techniques to Models of Search and Browsing Activity in a Digital Library........................................................................................900 G. Craig Murray (University of Maryland) Tutorials ........................................................................................................................................................901 Workshops ..................................................................................................................................................902 Author Index...............................................................................................................................................903 xvi SIGIR 2008 Organization General Co-Chairs: Tat-Seng Chua (National University of Singapore) Mun-Kew Leong (National Library Board, Singapore) Technical Program Co-Chairs: Sung Hyon Myaeng (Information and Communications University, Korea) Douglas W. Oard (University of Maryland, College Park, USA) Fabrizio Sebastiani (National Council of Research, Italy) Posters and Demos Co-Chairs: Fabio Crestani (University of Lugano, Switzerland) Efthimis N. Efthimiadis (University of Washington, USA) Hang Li (Microsoft Research Asia, China) Tutorials Chair: Edie M. Rasmussen (University of British Columbia, Canada) Workshop Co-Chairs: Peter Anick (Yahoo! Inc, USA) Hwee Tou Ng (National University of Singapore) Mentors Chair: Jian-Yun Nie (University of Montreal, Canada) Best Paper Award Chair: Noriko Kando (National Institute of Informatics, Japan) Doctoral Consortium Co-Chairs: Susan Dumais (Microsoft Research) Andrew Trotman (University of Otago, New Zealand) Publicity Co-Chairs: Soumen Chakrabarti (IIT Bombay, India) Colleen Cool (Queens College, City University of New York, USA) Gareth Jones (Dublin City University, Ireland) Ming Zhou (Microsoft Research Asia, China) Publication Chair: Ee-Peng Lim (Nanyang Technological University, Singapore) Registration Chair: Min-Yen Kan (National University of Singapore) Webmaster: Junhan Zhu (National University of Singapore) Local Arrangements: Haizhou Li (Institute for Infocomm Research, Singapore) Hwee-Hwa Pang (Singapore Management University) Finance Chair: Wee-Sun Lee (National University of Singapore) Conference Secretariat: Siew-Foong Ho (National University of Singapore) xvii Senior Programme Committee Eugene Agichtein (Emory University, USA) Shlomo Argamon (Illinois Institute of Technology, USA) Jamie Callan (Carnegie Mellon University, USA) Soumen Chakrabarti (Indian Institute of Technology, India) Hsin-Hsi Chen (National Taiwan University, Taiwan) Lee-Feng Chien (Google, Taiwan) Gordon V. Cormack (University of Waterloo, Canada) Nick Craswell (Microsoft, UK ) Maarten de Rijke (University of Amsterdam, The Netherlands) Edward Fox (Virginia Tech, USA) Sanda Harabagiu (University of Texas at Dallas, USA) Donna Harman (NIST, USA) Djoerd Hiemstra (University of Twente, The Netherlands) Thomas Hofmann (Google, Switerland ) Thorsten Joachims (Cornell University, USA) Gareth Jones (Dublin City University, Ireland) Rosie Jones (Yahoo!, USA) David Karger (MIT, USA) Jaana Kek¨l¨inen (University of Tampere, Finland ) aa Diane Kelly (University of North Carolina, USA) Wai Lam (Chinese University of Hong Kong, China) Tie-Yan Liu (Microsoft Research Asia, China) Yoelle Maarek (Google, Israel ) Gary Marchionini (University of North Carolina, USA) Massimo Melucci (University of Padova, Italy) Jan Pedersen (Yahoo!, USA) Berthier Ribeiro-Neto (Federal University of Minas Gerais, Brasil ) Hae-Chang Rim (Korea University, Korea) Stefan Rueger (The Open University, UK ) Mark Sanderson (University of Sheffield, UK ) Luo Si (Purdue University, USA) Ian Soboroff (NIST, USA) Ross Wilkinson (CSIRO, Austraila) Hugh Williams (Microsoft, USA) ChengXiang Zhai (University of Illinois at Urbana-Champaign, USA) Program Committee Ghaleb M. Abdulla (Lawrence Livermore Lab, USA) Maristella Agosti (University of Padova, Italy) Per Ahlgren (Stockholm University, Sweden) Helena Ahonen-Myka (University of Helsinki, Finland ) Eija Airio (University of Tampere, Finland ) Khalid Al-Kofahi (Thomson Corporation, USA) James Allan (University of Massachusetts Amherst, USA) Gianni Amati (Fondazione Ugo Bordoni, Italy) Einat Amitay (IBM Research, Haifa Lab, Israel ) Vo Anh (University of Melbourne, Australia) Javed Aslam (Northeastern University, USA) Fujii Atsushi (University of Tsukuba, Japan) Anne Aula (Google, Inc., USA) Ricardo Baeza-Yates (Yahoo! Research Barcelona, Spain) Mark Baillie (University of Strathclyde, UK ) Suhrid Balakrishnan (AT&T Labs Research, USA) Krisztian Balog (University of Amsterdam, The Netherlands) Roberto Basili (University of Rome Tor Vergata, Italy) Holger Bast (Max-Planck-Institut f¨r Informatik, u Germany) Micheline Beaulieu (University of Sheffield, UK ) Steve Beitzel (Telcordia Technologies, USA) Ron Bekkerman (HP Labs, USA) Mohammed Belkhatir (Monash University, Malaysia) Nicholas Belkin (Rutgers University, USA) Paul Bennett (Microsoft Research, USA) Stefano Berretti (University of Firenze, Italy) Krishna Bharat (Google, Inc., USA) Catherine Blake (University of North Carolina, USA) David Bodoff (University of Haifa, Israel ) Mohand Boughanem (Universit´ Paul Sabatier, e France) Giorgio Brajnik (University of Udine, Italy) Martin Braschler (Zurich University of Applied Sciences, Switzerland ) Andrei Broder (Yahoo! Inc., USA) Carla Brodley (Tufts University, USA) Eric W. Brown (IBM Research, USA) Chris Buckley (Sabir Research, USA) Stefan Buettcher (Google, Inc., USA) Katriina Bystrom (University College of Boras, Sweden) Deng Cai (University of Illinois at Urbana-Champaign, USA) Yunbo Cao (Microsoft Research Asia, China) David Carmel (IBM Haifa Research Labs, Israel ) Ben Carterette (University of Massachusetts, USA) xviii Joseph Carthy (University College Dublin, Ireland) Jeong-Won Cha (Changwon National University, Korea) Kuang-Hua Chen (National Taiwan University, Taiwan) Zheng Chen (Microsoft Research Asia, China) Pu-Jen Cheng (National Taiwan University, Taiwan) Abdur Chowdhury (Summize, USA) Jennifer Chu-Carroll (IBM T.J. Watson Research Center, USA) Kenneth W. Church (Microsoft, USA) Massimiliano Ciaramita (Yahoo! Research Barcelona, Spain) Charles Clarke (University of Waterloo, Canada) Kevyn Collins-Thompson (Carnegie Mellon University / University of Washington, USA) Silviu Cucerzan (Microsoft Research, USA) Krzysztof Czuba (Google, USA) Ray D'Amore (The MITRE Corporation, USA) Kareem Darwish (IBM Technology Development Center, Cairo) Gautam Das (University of Texas at Arlington, USA) Fernando Das Neves (Snoop Consulting SRL, Argentina) Hal Daume III (University of Utah, USA) Brian D. Davison (Lehigh University, USA) Dina Demner-Fushman (United States National Library of Medicine, USA) Fernando Diaz (Yahoo!, Canada) Anne R. Diekema (Syracuse University, USA) Ajay Divakaran (Mitsubishi Electric Research Laboratories, USA) Boris Dobrov (Moscow State University, Russia) Sandor Dominich (University of Pannonia, Hungary) Debora Donato (Yahoo! Research Barcelona, Spain) Tamas Doszkocs (National Library of Medicine, USA) J. Stephen Downie (University of Illinois at Urbana-Champaign, USA) Georges Dupret (Yahoo! Research Latin America, Chile) Miles Efron (University of Texas at Austin, USA) Koji Eguchi (Kobe University, Japan) Charles Elkan (University of California, San Diego, USA) Tamer Elsayed (University of Maryland, College Park, USA) Xin Fan (University of Sheffield, UK ) Hui Fang (Ohio State University, USA) Nicola Ferro (University of Padua, Italy) Marcus Fontoura (Yahoo! Research, USA) Dmitriy Fradkin (Siemens, USA) Martin Franz (IBM, USA) Luanne Freund (University of British Columbia, Canada) Xin Fu (Google, Inc., USA) Johannes F¨ ernkranz (Technische Universt¨t u a Darmstadt, Germany) Norbert Fuhr (University of Duisburg-Essen, Germany) Sumio Fujita (Yahoo! Japan Corporation, Japan) Patrick Gallinari (Universit´ Pierre et Marie Curie, e France) Susan Gauch (University of Arkansas, USA) Eric Gaussier (Universit´ Joseph Fourier, France) e Fatih Gelgi (Accord Institute for Education Research, USA) Rayid Ghani (Accenture Technology Labs, USA) C. Lee Giles (Pennsylvania State University, USA) Mark Girolami (University of Glasgow, UK ) Melanie Gnasa (Fraunhofer-Institut IAIS, Germany) Ayse G¨ker (City University London, UK ) o Jade Goldstein-Stewart (United States Department of Defense, USA) Gene Golovchinsky (FX Palo Alto Laboratory, Inc., USA) Yihong Gong (NEC Laboratories America, Inc., USA) Julio Gonzalo (Universidad Nacional de Educaci´n a o Distancia, Spain) Warren R. Greiff (The MITRE Corporation, USA) David A. Grossman (IIT, USA) Daniel Gruhl (IBM, USA) Preben Hansen (Swedish Institute of Computer Science, Sweden) Daqing He (University of Pittsburgh, USA) Turid Hedlund (Swedish School of Economics and Business Administration, Finland ) Andreas Henrich (University of Bamberg, Germany) Monika Henzinger (Ecole Polytechnique F´d´rale de e e Lausanne, Switzerland ) Maureen Heymans (Google, USA) Haym Hirsh (National Science Foundation, USA) Hsiao-Wuen Hon (Microsoft Research Asia, China) Jimmy Huang (York University, Canada) Zi Helen Huang (Open University, UK ) David Hull (Justsystem Evans Research, USA) Peter Ingwersen (Royal School of Library and Information Science, Denmark ) Panagiotis G. Ipeirotis (New York University, USA) Makoto Iwayama (Hitachi, Ltd., Japan) Bernard Jansen (Pennsylvania State University, USA) Kalervo Jarvelin (University of Tampere, Finland ) Eric C. Jensen (Summize / Illinois Institute of Technology, USA) Jing Jiang (University of Illinois at Urbana-Champaign, USA) Valentin Jijkoun (University of Amsterdam, The Netherlands) Jose Joemon (University of Glasgow, UK ) Hideo Joho (University of Glasgow, UK ) Rosie Jones (Yahoo! Inc., USA) xix Franciska de Jong (University of Twente, The Netherlands) Vanja Josifovski (Yahoo! Research, USA) Marko Junkkari (University of Tampere, Finland ) Jaap Kamps (University of Amsterdam, The Netherlands) In-Ho Kang (Carnegie Mellon University, USA) Bo-Young Kang (Seoul National University, Korea) Jussi Karlgren (Swedish Institute of Computer Science, Sweden) Gabriella Kazai (Microsoft Research, UK ) Heikki Keskustalo (University of Tampere, Finland ) Kimmo Kettunen (University of Tampere, Finland ) Kazuaki Kishida (Keio University, Japan) Shmuel Klein (Bar Ilan University, Israel ) Jeongwoo Ko (Oracle Corporation, USA) Youngjoong Ko (Dong-A University, Korea) Aleksander Kolcz (Microsoft, USA) Wessel Kraaij (TNO, The Netherlands) Don Kraft (Louisiana State University, USA) Ravi Kumar (Yahoo! Research, USA) Oren Kurland (Technion, Israel ) Kui-Lam Kwok (Queens College, City University of New York, USA) Mounia Lalmas (Queen Mary, University of London, UK ) Angela Monica Landoni (University of Strathclyde / University of Lugano, Switzerland ) Birger Larsen (Royal School of Library and Information Science, Denmark ) Victor Lavrenko (University of Edinburgh, Scotland, UK ) Gary G. Lee (POSTECH, South Korea) Miro Lehtonen (University of Helsinki, Finland ) Jochen L. Leidner (Thomson Corporation, USA) Azzopardi Leif (University of Paisley, UK ) Anton Leuski (Institute for Creative Technologies, USA) Gina-Anne Levow (University of Chicago, USA) Paul H. Lewis (University of Southampton, UK ) Tao Li (Florida International University, USA) Xin Li (Applied Research, Yahoo! Inc., USA) Qing Li (Arizona State University, China) Liz Liddy (Syracuse University, USA) Ee-Peng Lim (Nanyang Technological University, Singapore) King-Ip Lin (University of Memphis, USA) Jimmy Lin (University of Maryland, USA) Chin-Yew Lin (Microsoft Research Asia, China) Chuan-Jie Lin (National Taiwan Ocean University, Taiwan) Xia Lin (Drexel University, USA) Shin-Jeng Lin (Le Moyne College, USA) Krister Linden (University of Helsinki, Finland ) Tie-Yan Liu (Microsoft Research Asia, China) David Losada (University of Santiago de Compostela, Spain) Natalia Loukachevitch (Moscow State University, Russia) Jie Lu (IBM Research, USA) Robert W.P. Luk (Hong Kong Polytechnic University, China) Wei-Ying Ma (Microsoft Research Asia, China) Andrew MacFarlane (City University London, UK ) Craig Macdonald (University of Glasgow, UK ) Joao Magalhaes (Imperial College London, UK ) Jonathan Mamou (IBM Haifa Research Labs, Israel ) Thomas Mandl (University of Hildesheim, Germany) R. Manmatha (University of Massachusetts Amherst, USA) Christopher Manning (Stanford University, USA) Stephane Marchand-Maillet (Vper Group - University of Geneva, Switzerland ) Maarten Marx (University of Amsterdam, The Netherlands) James Mayfield (JHU/APL, USA) Robert McArthur (CSIRO, Australia) J. Scott McCarley (IBM TJ Watson Research Center, USA) Paul McNamee (Johns Hopkins University, USA) Qiaozhu Mei (University of Illinois at Urbana-Champaign, USA) Helen Meng (The Chinese University of Hong Kong, China) Donald Metzler (Yahoo! Research, USA) Alessandro Micarelli (Roma Tre University, Italy) Sebastian Michel (Max-Planck-Institut f¨r Informatik, u Germany) Sebastian Michel (EPFL, Switzerland ) Einat Minkov (Carnegie Mellon University, USA) Gilad Mishne (Yahoo!, USA) Mandar Mitra (Indian Statistical Institute, India) Vibhu Mittal (Google, USA) Stefano Mizzaro (University of Udine, Italy) Alistair Moffat (University of Melbourne, Australia) Pedro J. Moreno (Google Inc., USA) Josiane Mothe (IRIT, France) Isabelle Moulinier (Thomson Legal and Regulatory, USA) Edleno Moura (Universidade Federal do Amazonas, Brazil ) Henning Mueller (Service for medical informatics, Switzerland ) Vanessa Murdock (Yahoo! Research Barcelona, Spain) Seung-Hoon Na (POSTECH, Republic of Korea) Marc Najork (Microsoft Research, USA) Wolfgang Nejdl (L3S and University of Hannover, Germany) Jian-Yun Nie (University of Montreal, Canada) Zaiqing Nie (Microsoft Research Asia, China) xx Ragnar Nordlie (Oslo University College, Norway) Andreas Nuernberger (University of Magdeburg, Germany) Paul Ogilvie (mSpoke Inc. / Carnegie Mellon University, USA) J. Scott Olsson (University of Maryland, USA) Nicola Orio (University of Padua, Italy) Jahna Otterbacher (University of Cyprus, USA) Iadh Ounis (University of Glasgow, UK ) Gerhard Paass (Fraunhofer IAIS, Germany) Chris D. Paice (Lancaster University, UK ) Gabriella Pasi (Universit` degli Studi di Milano a Bicocca, Italy) Virgil Pavlu (Northeastern University, US ) Jan Pedersen (Yahoo! Inc., USA) Fuchun Peng (Yahoo!, USA) Wen-Chih Peng (NCTU, Taiwan) Jose Perez-Carballo (California State University, Los Angeles, USA) Vivien Petras (GESIS Social Science Information Centre, Germany) Jeremy Pickens (Fuji Xerox Palo Alto Laboratory, USA) Benjamin Piwowarski (Yahoo! Research Latin America, Chile) John Prager (IBM Research, USA) Katharina Probst (Accenture Technology Labs, USA) Dragomir R. Radev (University Michigan, USA) Filip Radlinski (Cornell University, USA) Vijay V. Raghavan (University of Louisiana at Lafayette, USA) Hema Raghavan (University of Massachusetts, Amherst, USA) Edie Rasmussen (University of British Columbia, Canada) Andreas Rauber (Vienna University of Technology, Austria) Soo Young Rieh (University of Michigan, USA) Knut Magne Risvik (Google, Norway) Henning Rode (University of Twente, The Netherlands) Thomas Roelleke (Queen Mary University, UK ) Monica Rogati (Carnegie Mellon University, USA) Dmitri Roussinov (Arizona State University, USA) Patrick Ruch (University of Geneva, Switzerland ) Miguel E. Ruiz (University of North Texas, USA) Ian Ruthven (University of Strathclyde, UK ) Tetsuya Sakai (NewsWatch, Inc., Japan) Jose San Pedro (University of Sheffield, UK ) Diana Santos (SINTEF ICT, Norway) Jacques Savoy (University of Neuchatel, Switzerland ) Ralf Schenkel (Max-Planck-Institut f¨r Informatik, u Germany) Falk Scholer (RMIT University, Australia) m.c. schraefel (University of Southampton, UK ) Hinrich Schuetze (University of Stuttgart, Germany) D. Sculley (Tufts University, USA) Pavel Serdyukov (University of Twente, The Netherlands) Jayavel Shanmugasundaram (Yahoo! Inc., USA) Rao Shen (Yahoo!, Canada) Xuehua Shen (Google, USA) Wookhyun Shin (Information and Communications University, Korea) Milad Shokouhi (Microsoft Research Cambridge, UK ) Stefan Siersdorfer (University of Sheffield, UK ) M´rio J. Silva (University of Lisbon, Portugal ) a Fabrizio Silvestri (ISTI - CNR, Italy) Malcolm Slaney (Yahoo! Research, USA) Mark Smucker (University of Massachusetts Amherst, USA) Aya Soffer (IBM Haifa Research Lab, Israel ) Dawei Song (Open University, UK ) Ruihua Song (Microsoft Research Asia, China) Amanda H. Spink (Queensland University of Technology, Australia) Rohini Srihari (University at Buffalo, USA) Padmini Srinivasan (University of Iowa, USA) Benno Stein (Bauhaus University Weimar, Germany) Tomek Strzalkowski (SUNY Albany, USA) Hussein Suleman (University of Cape Town, South Africa) Tao Tao (Microsoft, USA) Jaime Teevan (Microsoft Research, USA) Loren G. Terveen (University of Minnesota, USA) Ulrich Thiel (Fraunhofer IPSI, Germany) Paul Thomas (CSIRO / Australian National University, Australia) Paul Thompson (Dartmouth College, USA) Takenobu Tokunaga (Tokyo Institute of Technology, Japan) Anastasios Tombros (Queen Mary University of London, UK ) Stephen Tomlinson (Open Text Corporation, Canada) Elaine Toms (Dalhousie University, Canada) Yuen-Hsien Tseng (National Taiwan Normal University, Taiwan) Theodora Tsikrika (CWI, The Netherlands) Jun'ichi Tsujii (University of Manchester / University of Tokyo, Japan) Douglas Turnbull (University of California, San Diego, USA) Andrew Turpin (RMIT University, Australia) Howard Turtle (CogiTech, USA) Evelyne Tzoukermann (Comcast / StreamSage, USA) Trystan Upstill (Google, USA) Olga Vechtomova (University of Waterloo, Canada) Anne-Marie Vercoustre (INRIA, France) Vishwa Vinay (Microsoft Research Cambridge, UK ) Phil Vines (RMIT University, Australia) xxi Ellen M. Voorhees (NIST, USA) Arjen de Vries (CWI, The Netherlands) Nina Wacholder (Rutgers University, USA) Xuanhui Wang (University of Illinois at Urbana-Champaign, USA) Jianqiang Wang (State University of New York at Buffalo, USA) Jun Wang (University College London, UK ) Carolyn Watters (Dalhousie University, Canada) Bonnie L. Webber (University of Edinburgh, UK ) Gerhard Weikum (Max-Planck-Institut f¨r Informatik, u Germany) Ji-Rong Wen (Microsoft Research Asia, China) Thijs Westerveld (Teezir Search Solutions, The Netherlands) Ryen White (Microsoft Research, USA) Maria A. Wimmer (University of Koblenz, Germany) Xiayun Wu (Google, USA) Wensi Xi (Google Inc., USA) Zhichen Xu (Yahoo! Inc., USA) Jinxi Xu (BBN, USA) Murat Yakici (University of Strathclyde, UK ) Rong Yan (IBM TJ Watson Research, USA) Christopher C. Yang (Drexel University / The Chinese University of Hong Kong, USA) Kiduk Yang (Indiana University, USA) Yiming Yang (Carnegie Mellon University, USA) Hui Yang (Carnegie Mellon University, USA) Emine Yilmaz (Northeastern University, USA) Clement Yu (University of Illinois at Chicago, USA) Kai Yu (NEC Labs America, USA) Oren Zamir (Google, USA) Hugo Zaragoza (Yahoo! Research Barcelona, Spain) Hongyuan Zha (Georgia Institute of Technology, USA) Zhu Zhang (University of Arizona, USA) Dell Zhang (University of London, UK ) Lei Zhang (Microsoft Research Asia, China) Shichao Zhang (Guangxi Normal University, China) Yi Zhang (University of California, Santa Cruz, USA) Jian Zhang (Purdue University, USA) Aoying Zhou (East China Normal University / Fudan University, China) Nivio Ziviani (Federal University of Minas Gerais, Brazil ) Justin Zobel (NICTA, Australia) Roelof van Zwol (Yahoo! Research Barcelona, Spain) xxii Doctoral Consortium Committee James Allan (University of Massachusetts Amherst, USA) Jamie Callan (Carnegie Mellon University, USA) Charlie Clarke (University of Waterloo, Canada) Susan Dumais (Microsoft Research, USA), Co-Chair David Hawking (CSIRO ICT Centre, Australia) Thorsten Joachims (Cornell University, USA) Jaap Kamps (University of Amsterdam, The Netherlands) Liz Liddy (Syracuse University, USA) Yoelle Maarek (Google Haifa Engineering Center, Israel ) Stephen Robertson (City University London, UK ) Ian Ruthven (University of Strathclyde, UK ) Andrew Trotman (University of Otago, New Zealand ), Co-Chair Mentors Committee Greg Grefenstette (CEA LIST-LIC2M, France) David Hawking (CSIRO ICT Centre, Australia) Bill Hersh (Oregon Health and Science University, USA) Jimmy Huang (York University, Canada) Kalervo J¨rvelin (University of Tampere, Finland ) a Rong Jin (Michigan State University, USA) Gareth Jones (Dublin City University, Ireland) Rosie Jones (Yahoo! Research, USA) Mounia Lalmas (Queen Mary, University of London, UK ) Jimmy Lin (University of Maryland, College Park, USA) Donald Metzler (Yahoo! Research, USA) Jian-Yun Nie (University of Montreal, Canada), Chair Ian Ruthven (University of Strathclyde, UK ) Mark Sanderson (University of Sheffield, UK ) Luo Si (Purdue University, USA) Ryen White (Microsoft Research, USA) Hugo Zaragoza (Microsoft Research, USA) Tutorials Committee Holger Bast (Max-Planck-Institut f¨r Informatik, u Germany) Luanne Freund (University of British Columbia, Canada) Christopher Khoo (Nanyang Technological University, Singapore) Vibhu Mittal (Google, Inc., USA) Edie Rasmussen (University of British Columbia, Canada), Chair Ian Ruthven (University of Strathclyde, UK ) Workshop Committee Peter Anick (Yahoo!, USA), Co-Chair Einat Amitay (IBM Research, Israel ) Peter Bruza (Queensland University of Technology, Australia) Jussi Karlgren (Swedish Institute of Computer Science, Sweden) Christopher Khoo (Nanyang Technological University, Singapore) Victor Lavrenko (University of Edinburgh, UK ) Gary Geunbae Lee (Pohang University of Science and Technology, Korea) Chin-Yew Lin (Microsoft Research Asia, China) Hwee Tou Ng (National University of Singapore, Singapore), Co-Chair xxiii Additional Paper Reviewers Brian Almquist (University of Iowa, USA) Korinna Bade (University of Magdeburg, Germany) Steven Burrows (RMIT University, Australia) Guillaume Cabanac (Universit´ de Toulouse, France) e Tullio Coppotelli (University of Padua, Italy) Na Dai (Lehigh University, USA) Laurie Damianos (MITRE Corp., USA) Subramaniam Ganapathy (Carnegie Mellon University, USA) Abhay S. Harpale (Carnegie Mellon University, USA) Viet Ha-Thuc (University of Iowa, USA) John Henderson (MITRE Corp., USA) Thomas Johnsten (University of South Alabama, USA) June-Jei Kuo (National Chung Hsing University, Taiwan) Abhimanyu Lad (Carnegie Mellon University, USA) Zhiwei Li (Microsoft Research Asia, China) Ming Luo (Nextag.com, USA) Ernesto W. de Luca (University of Magdeburg, Germany) Yosi Mass (IBM Haifa Research Labs, Israel ) Riccardo Miotto (University of Padua, Italy) Lan Nie (Lehigh University, USA) Wen-Chih Peng (National Chiao Tung University, Taiwan) Luca Pretto (University of Padua, Italy) Xiaoguang Qi (Lehigh University, USA) Yaron Rachlin (Accenture Technology Labs, USA) Konstantin Salomatin (Carnegie Mellon University, USA) Nico Schlaefer (Carnegie Mellon University, USA) Hayri Sever (Cankaya University, Turkey) Hideki Shima (Carnegie Mellon University, USA) Gianmaria Silvello (University of Padua, Italy) James Thom (RMIT University, Australia) T. N. Vikram (University of Mysore, India) Raymond Wan (Kyoto University, Japan) Fei Wang (Tsinghua University, China) Jian Wang (Lehigh University, USA) Xing Wei (Yahoo! Inc., USA) Mingfang Wu (RMIT University, Australia) Hui Yang (Carnegie Mellon University, USA) Erliang Zeng (Tsinghua University, China) Ye Zhou (Google, USA) Poster and Demonstration Reviewers Ghaleb Abdulla (Lawrence Livermore Lab, USA) Maristella Agosti (University of Padova, Italy) Eija Airio (University of Tampere, Finland ) Khalid Al-Kofahi (Thomson Reuters, USA) Azzah Al-Maskari (The University of Sheffield, UK ) James Allan (University of Massachusetts Amherst, USA) Ismail Sengor Altingovde (Bilkent University, Turkey) Gianni Amati (Fondazione Ugo Bordoni, Italy) Sophia Ananiadou (University of Manchester, UK ) Javed Aslam (Northeastern University, USA) Fujii Atsushi (University of Tsukuba, Japan) Anne Aula (Google, USA) Richard Bache (University of Strathclyde, UK ) Mark Baillie (University of Strathclyde, UK ) Roberto Basili (University of Roma Tor Vergata, Italy) Holger Bast (Max-Planck-Institut f¨r Informatik, u Germany) Micheline Beaulieu (The University of Sheffield, UK ) Steve Beitzel (Telcordia Technologies, USA) Ron Bekkerman (HP Labs, USA) Mohammed Belkhatir (Monash University, Australia) Paul Bennett (Microsoft Research, USA) Stefano Berretti (University of Firenze, Italy) Ralf Bierig (Rutgers University, USA) Catherine Blake (University of North Carolina at Chapel Hill, USA) Mohand Boughanem (Universit´ Paul Sabatier, e France) Martin Braschler (Zurich University of Applied Sciences, Switzerland ) Andrei Broder (Yahoo!, USA) Carla Brodley (Tufts University, USA) Chris Buckley (Sabir Research, USA) Stefan Buettcher (Google, USA) Deng Cai (University of Illinois at Urbana-Champaign, USA) Fazli Can (Bilkent University, Turkey) Yunbo Cao (Microsoft Research Asia, China) Ben Carterette (University of Massachusetts Amherst, USA) Joe Carthy (University College Dublin, Ireland ) Moreno Carullo (Universit` degli Studi dell'Insubria, a Italy) Jeong-Won Cha (Changwon National University, South Korea) 1 xxiv Kuang-Hua Chen (National Taiwan University, Taiwan) Zheng Chen (Microsoft Research Asia, China) Pu-Jen Cheng (National Taiwan University, Taiwan) Abdur Chowdhury (Summize, USA) Gobinda Chowdhury (University of Strathclyde, UK ) Kenneth Church (Microsoft Research, USA) Massimiliano Ciaramita (Yahoo! Research Barcelona, Spain) Charles Clarke (University of Waterloo, Canada) Kevyn Collins-Thompson (Carnegie Mellon University, USA) Silviu Cucerzan (Microsoft Research, USA) Krzysztof Czuba (Google, USA) Ray D'Amore (The MITRE Corporation, USA) Fernando Das Neves (Snoop Consulting SRL, Argentina) Hal Daume III (University of Utah, USA) Arjen de Vries (Centrum voor Wiskunde en Informatica, The Netherlands) Dina Demner-Fushman (United States National Library of Medicine, USA) Fernando Diaz (Yahoo!, Canada) Anne Diekema (Syracuse University, USA) Ajay Divakaran (Sarnoff Corporation, USA) Boris Dobrov (Moscow State University, Russia) Sandor Dominich (University of Pannonia, Hungary) Debora Donato (Yahoo! Research Barcelona, Spain) J. Stephen Downie (University of Illinois at Urbana-Champaign, USA) Georges Dupret (Yahoo! Research Latin America, Chile) Miles Efron (University of Texas at Austin, USA) Koji Eguchi (Kobe University, Japan) Charles Elkan (University of California, San Diego, USA) Xin Fan (The University of Sheffield, UK ) Hui Fang (Ohio State University, USA) Nicola Ferro (University of Padua, Italy) Marcus Fontoura (Yahoo!, USA) Dmitriy Fradkin (Siemens, USA) Xin Fu (Google, USA) Johannes F¨ernkranz (Technische Universt¨t u a Darmstadt, Germany) Norbert Fuhr (University of Duisburg-Essen, Germany) Sumio Fujita (Yahoo!, Japan) Patrick Gallinari (Universit´ Pierre et Marie Curie, e France) Susan Gauch (University of Arkansas, USA) Eric Gaussier (Universit´ Joseph Fourier, France) e Fatih Gelgi (Accord Institute for Education Research, USA) Rayid Ghani (Accenture Technology Labs, USA) C. Lee Giles (Pennsylvania State University, USA) Melanie Gnasa (Fraunhofer-Institut IAIS, Germany) Ayse Goker (City University London, UK ) Warren Greiff (MITRE, USA) David Grossman (IIT, USA) Daniel Gruhl (IBM Almaden Research Center, USA) Preben Hansen (Swedish Institute of Computer Science, Sweden) Daqing He (University of Pittsburgh, USA) Andreas Henrich (University of Bamberg, Germany) Jimmy Huang (York University, Canada) Zi Helen Huang (Open University, UK ) Theo Huibers (University of Twente, The Netherlands) David Hull (Justsystem Evans Research, USA) Makoto Iwayama (Hitachi, Japan) Bernard Jansen (Pennsylvania State University, USA) Eric Jensen (Summize, USA) Jing Jiang (University of Illinois at Urbana-Champaign, USA) Valentin Jijkoun (University of Amsterdam, The Netherlands) Hideo Joho (University of Glasgow, UK ) Xu Jun (Microsoft Research Asia, China) Jaap Kamps (University of Amsterdam, The Netherlands) Bo-Young Kang (Seoul National University, South Korea) Jussi Karlgren (Swedish Institute of Computer Science, Sweden) Gabriella Kazai (Microsoft Research Cambridge, UK ) Mostafa Keikha (University of Lugano, Switzerland ) Kimmo Kettunen (University of Tampere, Finland ) Kazuaki Kishida (Keio University, Japan) Jeongwoo Ko (Oracle, USA) Aleksander Kolcz (Microsoft Research, USA) Don Kraft (Louisiana State University, USA) Ravi Kumar (Yahoo!, USA) Oren Kurland (Technion, Israel ) Monica Landoni (University of Strathclyde, UK ) Birger Larsen (Royal School of Library and Information Science, Denmark ) Victor Lavrenko (University of Edinburgh, UK ) Fotis Lazarinis (Technological Educational Institute, Greece) Gary G. Lee (POSTECH, South Korea) Miro Lehtonen (University of Helsinki, Finland ) Jochen Leidner (Thomson Reuters Corporation, USA) Qing Li (Southwestern University of Finance and Economics, China) Tao Li (Florida International University, USA) Xin Li (Yahoo!, USA) Liz Liddy (Syracuse University, USA) Chuan-Jie Lin (National Taiwan Ocean University, Taiwan) Jimmy Lin (University of Maryland, USA) 2 xxv King-Ip Lin (University of Memphis, USA) Shin-Jeng Lin (Le Moyne College, USA) Xia Lin (Drexel University, USA) Krister Lind´n (University of Helsinki, Finland ) e David Losada (University of Santiago de Compostela, Spain) Natalia Loukachevitch (Moscow State University, Russia) Jie Lu (IBM TJ Watson Research Center, USA) Lie Lu (Microsoft Research Asia, China) Robert Luk (Hong Kong Polytechnic University, China) Craig Macdonald (University of Glasgow, UK ) Andrew MacFarlane (City University London, UK ) Joao Magalhaes (Imperial College London, UK ) Jonathan Mamou (IBM Haifa Research Labs, Israel ) Thomas Mandl (Universit¨t Hildesheim, Germany) a Maarten Marx (University of Amsterdam, The Netherlands) James Mayfield (Johns Hopkins University, USA) Robert McArthur (CSIRO ICT Centre, Australia) J. Scott McCarley (IBM TJ Watson Research Center, USA) Paul McNamee (Johns Hopkins University, USA) Helen Meng (Chinese University of Hong Kong, China) Donald Metzler (Yahoo!, USA) Sebastian Michel (Ecole Polytechnique Federale de Lausanne, Switzerland ) Gilad Mishne (Yahoo!, USA) Mandar Mitra (Indian Statistical Institute, India) Vibhu Mittal (Google, USA) Stefano Mizzaro (University of Udine, Italy) Alistair Moffat (University of Melbourne, Australia) Masnizah Mohd (University of Strathclyde, UK ) Pedro Moreno (Google, USA) Josiane Mothe (Institut de Recherche en Informatique de Toulouse, France) Edleno Moura (Universidade Federal do Amazonas, Brazil ) Henning M¨ller (University Hospitals of Geneva, u Switzerland ) Vanessa Murdock (Yahoo! Research Barcelona, Spain) Marc Najork (Microsoft Research, USA) Zaiqing Nie (Microsoft Research Asia, China) Tadashi Nomoto (National Institute of Japanese Literature, Japan) Ragnar Nordlie (Oslo University College, Norway) Andreas Nuernberger (University of Magdeburg, Germany) Paul Ogilvie (mSpoke, USA) J. Scott Olsson (University of Maryland, USA) Jahna Otterbacher (University of Michigan, USA) Iadh Ounis (University of Glasgow, UK ) Gabriella Pasi (Universit` degli Studi di Milano a Bicocca, Italy) Virgil Pavlu (Northeastern University, USA) Fuchun Peng (Yahoo!, USA) Vivien Petras (GESIS Social Science Information Centre, Germany) Jeremy Pickens (FX Palo Alto Laboratory, Inc., USA) Benjamin Piwowarski (Yahoo! Research Latin America, Chile) Tao Qin (Tsinghua University, China) Dragomir Radev (University of Michigan, USA) Filip Radlinski (Cornell University, USA) Hema Raghavan (University of Massachusetts Amherst, USA) Vijay Raghavan (University of Louisiana, USA) Edie Rasmussen (University of British Columbia, Canada) Andreas Rauber (Vienna University of Technology, Austria) Knut Magne Risvik (Google, Norway) Thomas Roelleke (Queen Mary University, UK ) Monica Rogati (Carnegie Mellon University, USA) Dmitri Roussinov (Arizona State University, USA) Miguel Ruiz (University of North Texas, USA) Ian Ruthven (University of Strathclyde, UK ) Tetsuya Sakai (NewsWatch, Japan) Jose San Pedro (The University of Sheffield, UK ) Jacques Savoy (University of Neuchatel, Switzerland ) Ralf Schenkel (Max-Planck-Institut f¨r Informatik, u Germany) Falk Scholer (RMIT University, Australia) Pavel Serdyukov (University of Twente, The Netherlands) Na Seung-Hoon (POSTECH, South Korea) Rad Shen (Yahoo!, Canada) Xuehua Shen (Google, USA) Milad Shokouhi (Microsoft Research Cambridge, UK ) Stefan Siersdorfer (The University of Sheffield, UK ) M´rio J. Silva (University of Lisbon, Portugal ) a Fabrizio Silvestri (Information Science and Technology Institute, Italy) Mark Smucker (University of Massachusetts Amherst, USA) Lorenzo Sommaruga (University of Applied Sciences Switzerland, Switzerland ) Hussein Suleman (University of Cape Town, South Africa) Tao Tao (Microsoft Research, USA) Jaime Teevan (Microsoft Research, USA) Loren Terveen (University of Minnesota, USA) Ulrich Thiel (Fraunhofer IPSI, Germany) Paul Thomas (CSIRO, Australia) Paul Thompson (Dartmouth College, USA) Anastasios Tombros (Queen Mary University, UK ) Elaine Toms (Dalhousie University, Canada) 3 xxvi Theodora Tsikrika (CWI, The Netherlands) Douglas Turnbull (University of California, San Diego, USA) Andrew Turpin (RMIT University, Australia) Olga Vechtomova (University of Waterloo, Canada) Vishwa Vinay (Microsoft Research Cambridge, UK ) Alessandro Vinciarelli (IDIAP Research Institute, Switzerland ) Phil Vines (RMIT University, Australia) Nina Wacholder (Rutgers University, USA) Jun Wang (University College London, UK ) Gerhard Weikum (Max-Planck-Institut f¨r Informatik, u Germany) Thijs Westerveld (Teezir Search Solutions, The Netherlands) Maria Wimmer (University of Koblenz, Germany) Xiayun Wu (Google, USA) Wensi Xi (Google, USA) Zhichen Xu (Yahoo!, USA) Murat Yakici (University of Strathclyde, UK ) Rong Yan (IBM TJ Watson Research, USA) Emine Yilmaz (Microsoft Research Cambridge, UK ) Hugo Zaragoza (Yahoo! Research Barcelona, Spain) Hongyuan Zha (Georgia Institute of Technology, USA) Dell Zhang (University of London, UK ) Jian Zhang (Purdue University, USA) Lei Zhang (Microsoft Research Asia, China) Yi Zhang (University of California, Santa Cruz, USA) Aoying Zhou (East China Normal University, China) Justin Zobel (NICTA, Australia) Additional Poster and Demonstration Reviewers Rui Cai (Microsoft Research Asia, China) Paolo Casoto (University of Udine, Italy) Carlos Castillo (Yahoo! Research Barcelona, Spain) Gianluca Demartini (Leibniz Universit¨t Hannover, a Germany) Julia Luxenburger (Max-Planck-Institut f¨r u Informatik, Germany) 4 xxvii