These proceedings contain the papers presented at ECIR 2009, the 31st - ropean Conference on Information Retrieval. The conference was organized by the Institut de Recherche en Informatique de Toulouse (IRIT), in cooperation with the Information Retrieval Specialist Group of the British Computer So- ety (BCS-IRSG) and was supported by the Special Interest Group on Infor- tion Retrieval (ACM SIGIR), the French Association of Information Retrieval (ARIA) and E-IRSG. It was held during April 6-9, 2007 in Toulouse, hosted by the Pierre Baudis congress center. ECIR 2009 con?rmed the growth trend of submissions, with 188 full-paper submissions. Many of these submissions came from outside Europe, and 25 countries were represented in the ?nal ECIR 2009 program, re?ecting the international po- larityandreputationoftheconferenceseries.Furthermorethetraditionalstrong focus on students was well preserved, with their participation being great. All submitted papers were reviewed by at least three members of the int- national Program Committee. Out of the 188 papers 42 were selected as full research papers and a further 18 were accepted as short research papers. Short papers were given 8 pages in the proceedings (instead of 12). Out of these 60 selected papers, 30 have a student as the primary author. The accepted papers themselves come from a mixture of universities, researchinstitutes and comm- cial organizations. There was also a separate call for posters. Each of the 60 poster submissions wasreviewedbythreeProgramCommitteemembers, aswithpapersubmissions. Twenty-?ve posters were accepted for presentation. Takentogether, thesepaperscoverthestateoftheartininformationretrieval, including topicssuchasretrievalmodels, evaluationandWeb search, andeme- ing topics such as learning to rank, expert search and opinion detect

This two-volume set LNCS 12656 and 12657 constitutes the refereed proceedings of the 43rd European Conference on IR Research, ECIR 2021, held virtually in March/April 2021, due to the COVID-19 pandemic.The 50 full papers presented together with 11 reproducibility papers, 39 short papers, 15 demonstration papers, 12 CLEF lab descriptions papers, 5 doctoral consortium papers, 5 workshop abstracts, and 8 tutorials abstracts were carefully reviewed and selected from 436 submissions. The accepted contributions cover the state of the art in IR: deep learning-based information retrieval techniques, use of entities and knowledge graphs, recommender systems, retrieval methods, information extraction, question answering, topic and prediction models, multimedia retrieval, and much more.

This two-volume set LNCS 12656 and 12657 constitutes the refereed proceedings of the 43rd European Conference on IR Research, ECIR 2021, held virtually in March/April 2021, due to the COVID-19 pandemic.The 50 full papers presented together with 11 reproducibility papers, 39 short papers, 15 demonstration papers, 12 CLEF lab descriptions papers, 5 doctoral consortium papers, 5 workshop abstracts, and 8 tutorials abstracts were carefully reviewed and selected from 436 submissions. The accepted contributions cover the state of the art in IR: deep learning-based information retrieval techniques, use of entities and knowledge graphs, recommender systems, retrieval methods, information extraction, question answering, topic and prediction models, multimedia retrieval, and much more.

This book constitutes the refereed proceedings of the 9th International Conference of the CLEF Initiative, CLEF 2018, jointly organized by Avignon, Marseille and Toulon universities and held in Avignon, France, in September 2018. The conference has a clear focus on experimental information retrieval with special attention to the challenges of multimodality, multilinguality, and interactive search ranging from unstructured to semi structures and structured data. The 13 papers presented in this volume were carefully reviewed and selected from 39 submissions. Many papers tackle the medical ehealth and ehealth multimedia retrieval challenges, however there are many other topics of research such as document clustering, social biases in IR, social book search, personality profiling. Further this volume presents 9 "best of the labs" papers which were reviewed as a full paper submission with the same review criteria. The labs represented scientific challenges based on new data sets and real world problems in multimodal and multilingual information access. In addition to this, 10 benchmarking labs reported results of their yearlong activities in overview talks and lab sessions. The papers address all aspects of information access in any modularity and language and cover a broad range of topics in the field of multilingual and multimodal information access evaluation.

This book constitutes the refereed proceedings of the 38th European Conference on IR Research, ECIR 2016, held in Padua, Italy, in March 2016. The 42 full papers and 28 poster papers presented together with 3 keynote talks and 6 demonstration papers, were carefully reviewed and selected from 284 submissions. The volume contains the outcome of 4 workshops as well as 4 tutorial papers in addition. Being the premier European forum for the presentation of new research results in the field of Information Retrieval, ECIR features a wide range of topics such as: social context and news, machine learning, question answering, ranking, evaluation methodology, probalistic modeling, evaluation issues, multimedia and collaborative filtering, and many more.