bias collaborative filtering collaborative systems contact recommendation context diversity ensembles evaluation experimental methodology false positives finance group recommendation hybrid recommendation information extraction information retrieval information retrieval models information retrieval theory knn link prediction metasearch metrics multi-armed bandits multimedia retrieval news retrieval nlp non-random missing data novelty performance prediction personalization popularity probability ranking principle rank aggregation rank fusion recommender systems relation extraction semantic annotation semantic search semantics social networks web services
2020 |
| J. Sanz-Cruzado, C. Macdonald, I. Ounis, P. Castells. Axiomatic Analysis of Contact Recommendation Methods in Social Networks: an IR perspective. 42th European Conference on Information Retrieval (ECIR 2020), Springer Verlag Lecture Notes in Computer Science, Vol. 12035. Lisbon, Portugal, April 2020, ISBN: 978-3-030-45439-5, pp. 175-90. |
2019 |
|
J. Sanz-Cruzado, P. Castells.
Information Retrieval Models for Contact Recommendation in Social Networks.
41st European Conference on Information Retrieval (ECIR 2019), Springer Verlag Lecture Notes in Computer Science, Vol. 11437. Cologne, Germany, April 2019, ISBN: 978-3-030-15711-1, pp. 148-163. Slides |
2018 |
|
R. Cañamares, P. Castells.
Should I Follow the Crowd? A Probabilistic Analysis of the Effectiveness of Popularity in Recommender Systems.
41st Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2018). Ann Arbor, Michigan, USA, July 2018, pp. 415-424 — best paper award. Slides |
|
R. Cañamares, P. Castells.
From the PRP to the Low Prior Discovery Recall Principle for Recommender Systems.
41st Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2018). Ann Arbor, Michigan, USA. July 2018, pp. 1081-1084. Poster |
2015 |
| P. Castells, N. J. Hurley, S. Vargas. Novelty and Diversity in Recommender Systems. In Francesco Ricci, Lior Rokach, Bracha Shapira (Eds.): Recommender Systems Handbook, 2nd edition. Springer, 2015, ISBN: 978-1-4899-7637-6, pp. 881-918. |
2014 |
| A. Bellogín, P. Castells, I. Cantador. Neighbor Selection and Weighting in User-Based Collaborative Filtering: A Performance Prediction Approach. ACM Transactions on the Web 8(2), March 2014. |
2013 |
| A. Bellogín, J. Wang, P. Castells. Bridging Memory-Based Collaborative Filtering and Text Retrieval. Information Retrieval 16(6), December 2013, pp. 697-724. |
| A. Bellogín, J. Parapar, P. Castells. Probabilistic Collaborative Filtering with Negative Cross Entropy. 7th ACM Conference on Recommender Systems (RecSys 2013). Hong Kong, China, October 2013, pp. 387-390. |
| J. Parapar, A. Bellogín, P. Castells, A. Barreiro. Relevance-Based Language Modelling for Recommender Systems. Information Processing & Management 49(4), July 2013. |
2012 |
|
S. Vargas, P. Castells, D. Vallet.
Explicit Relevance Models in Intent-Oriented Information Retrieval Diversification.
35th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2012). Portland, OR, USA, August 2012, pp. 75-84. Slides |
| D. Vallet, P. Castells. Personalized Diversification of Search Results. 35th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2012). Portland, OR, USA, August 2012, pp. 841-850. |
| S. Vargas, P. Castells, D. Vallet. On the Suitability of Intent Spaces for IR Diversification. International Workshop on Diversity in Document Retrieval (DDR 2012) at the 5th ACM International Conference on Web Search and Data Mining (WSDM 2012). Seattle, Washington, USA, February 2012. |
2011 |
| M. Fernández, I. Cantador, V. López, D. Vallet, P. Castells, E. Motta. Semantically enhanced Information Retrieval: an ontology-based approach. Journal of Web Semantics 9(4), special issue on Semantic Search, December 2011, pp. 434-452. |
| A. Bellogín, J. Wang, P. Castells. Structured Collaborative Filtering. 20th ACM International Conference on Information and Knowledge Management (CIKM 2011). Glasgow, UK, October 2011, pp. 2257-2260. |
| A. Bellogín, P. Castells, I. Cantador. Predicting the Performance of Recommender Systems: An Information Theoretic Approach. 3rd International Conference on the Theory of Information Retrieval (ICTIR 2011) - Springer Verlag Lecture Notes in Computer Science, Vol. 6931. Bertinoro, Italy, September 2011, ISBN: 978-3-642-23317-3, pp. 27-39. |
|
S. Vargas, P. Castells, D. Vallet.
Intent-Oriented Diversity in Recommender Systems.
34th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2011). Beijing, China, July 2011, pp. 1211-1212. Poster |
| D. Vallet, P. Castells. On Diversifying and Personalizing Web Search. 34th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2011). Beijing, China, July 2011, pp. 1157-1158. |
| D. Vallet, M. Halvey, J. Jose, P. Castells. Applying Soft Links to Diversify Video Recommendations. 9th International Workshop on Content-Based Multimedia Indexing (CBMI 2011). Madrid, Spain, June 2011. |
| P. Castells, S. Vargas, J. Wang. Novelty and Diversity Metrics for Recommender Systems: Choice, Discovery and Relevance. International Workshop on Diversity in Document Retrieval (DDR 2011) at the 33rd European Conference on Information Retrieval (ECIR 2011). Dublin, Ireland, April 2011. |
| A. Bellogín, J. Wang, P. Castells. Text Retrieval Methods for Item Ranking in Collaborative Filtering. 33rd European Conference on Information Retrieval (ECIR 2011), Springer Verlag Lecture Notes in Computer Science, Vol. 6611. Dublin, Ireland, April 2011, ISBN: 978-3642201608, pp. 301-306. |
2009 |
| M. Fernández, V. López, M. Sabou, V. Uren, D. Vallet, E. Motta, P. Castells. Using TREC for cross-comparison between classic IR and ontology-based search models at a Web scale. Workshop on Semantic Search (SemSearch 2009), at the 18th International World Wide Web Conference (WWW 2009). Madrid, Spain, April 2009. |
2008 |
| M. Fernández, V. López, M. Sabou, V. Uren, D. Vallet, E. Motta, P. Castells. Semantic Search meets the Web. 2nd IEEE International Conference on Semantic Computing (ICSC 2008). Santa Clara, CA, USA, August 2008. |
| Ph. Mylonas, D. Vallet, P. Castells, M. Fernández, and Y. Avrithis. Personalized information retrieval based on context and ontological knowledge. Knowledge Engineering Review 23(1), special issue on Contexts and Ontologies, March 2008, pp. 73-100. |
| C. Dolbear, P. Hobson, D. Vallet, M. Fernández, I. Cantador, P. Castells. Personalised Multimedia Summaries. In Y. Kompatsiaris, P. Hobson (Eds.): Semantic Multimedia and Ontologies. Springer Verlag, March 2008, ISBN: 978-1-84800-075-9, pp. 165-184. |
| I. Cantador, M. Fernández, D. Vallet, P. Castells, J. Picault, M. Ribière. A Multi-Purpose Ontology-Based Approach for Personalised Content Filtering and Retrieval. In M. Wallace, M. Angelides, Ph. Mylonas (Eds.): Advances in Semantic Media Adaptation and Personalization. Springer Verlag Studies in Computational Intelligence, Vol. 93, February 2008, ISBN: 978-3-540-76359-8, pp. 25-52. |
2007 |
| J. Tejedor, R. García, M. Fernández, F. J. López, F. Perdrix, J. A. Macías, R. M. Gil, M. Oliva, D. Moya, J. Colás, P. Castells. Ontology-Based Retrieval of Human Speech. 6th International Workshop on Web Semantics (WebS 2007) at the 18th International Conference on Database and Expert Systems Applications (DEXA 2007). Regensburg, Germany, September 2007. |
| D. Vallet, P. Castells, M. Fernández, P. Mylonas, Y. Avrithis. Personalized Content Retrieval in Context Using Ontological Knowledge. IEEE Transactions on Circuits and Systems for Video Technology 17(3), special issue on the convergence of knowledge engineering, semantics and signal processing in audiovisual information retrieval, March 2007, pp. 336-346. |
| P. Castells, M. Fernández, D. Vallet. An Adaptation of the Vector-Space Model for Ontology-Based Information Retrieval. IEEE Transactions on Knowledge and Data Engineering 19(2), special issue on Knowledge and Data Engineering in the Semantic Web Era, February 2007, pp. 261-272. |
2006 |
| D. Vallet, I. Cantador, M. Fernández, P. Castells. A Multi-Purpose Ontology-Based Approach for Personalized Content Filtering and Retrieval. 1st International Workshop on Semantic Media Adaptation and Personalization (SMAP 2006). Athens, Greece, December 2006. |
| M. Fernández, D. Vallet, P. Castells. Using Historical Data to Enhance Rank Aggregation. 29th Annual International ACM Conference on Research and Development in Information Retrieval (SIGIR 2006). Seattle, WA, USA, August 2006, pp. 643-644. |
| D. Vallet, M. Fernández, P. Castells, P. Mylonas, Y. Avrithis. A contextual personalization approach based on ontological knowledge. International Workshop on Context and Ontologies: Theory, Practice and Applications (C&O 2006) at the 17th European Conference on Artificial Intelligence (ECAI 2006). Riva del Garda, Italy, August 2006. |
| D. Vallet, M. Fernández, P. Castells, P. Mylonas, Y. Avrithis. Personalized Information Retrieval in Context. 3rd International Workshop on Modeling and Retrieval of Context (MRC 2006) at the 21st National Conference on Artificial Intelligence (AAAI 2006). Boston, MA, USA, July 2006. |
| I. Cantador, P. Castells, D. Vallet. Enriching Group Profiles with Ontologies for Knowledge-Driven Collaborative Content Retrieval. 1st Int. Workshop on Semantic Technologies in Collaborative Applications (STICA 2006), at the 15th IEEE Workshops on Enabling Technologies: Infrastructures for Collaborative Enterprises (WETICE 2006). Manchester, UK, June 2006. |
| A. Evans, M. Fernández, D. Vallet, P. Castells. Adaptive Multimedia Access: From User Needs to Semantic Personalisation. IEEE International Symposium on Circuits and Systems (ISCAS 2006). Kos, Greece, May 2006. |
|
M. Fernández, D. Vallet, P. Castells.
Probabilistic Score Normalization for Rank Aggregation.
28th European Conference on Information Retrieval (ECIR 2006), Springer Verlag Lecture Notes in Computer Science, Vol. 3936, ISBN 3-540-33347-9. London, UK, April 2006, pp. 553-556. Poster |
2005 |
| D. Vallet, M. Fernández, P. Castells. The Quest for Information Retrieval on The Semantic Web. Upgrade 6 (6), Monograph: The Semantic Web, December 2005, pp. 19-23. |
| P. Castells, M. Fernández, D. Vallet, P. Mylonas, Y. Avrithis. Self-Tuning Personalized Information Retrieval in an Ontology-Based Framework. 1st IFIP WG 2.12 & WG 12.4 International Workshop on Web Semantics (SWWS 2005). Springer Verlag Lecture Notes in Computer Science, Vol. 3762. Agia Napa, Cyprus, November 2005, ISSN: 3-540-29739-1, pp. 977-986. |
| D. Vallet, P. Mylonas, M. A. Corella, J. M. Fuentes, P. Castells, Y. Avrithis. A Semantically-Enhanced Personalization Framework for Knowledge-Driven Media Services. IADIS WWW/Internet 2005 Conference (ICWI 2005). Lisbon, Portugal, October 2005, pp. 11-18. |
| D. Vallet, M. Fernández, P. Castells. An Ontology-Based Information Retrieval Model. 2nd European Semantic Web Conference (ESWC 2005). Springer Verlag Lecture Notes in Computer Science, Vol. 3532. Heraklion, Greece, May 2005, ISSN: 3-540-26124-9, pp. 455-470. |