João Magalhães

2026

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Agentic Search in the Wild: Intents and Trajectory Dynamics from 14M+ Real Search Requests.
Jingjie Ning|Zhaohua Zhang|Boran Hou|João Coelho|Jingjie Ning|Zhaohua Zhang|João Coelho|Yibo Kong|Masoud Makrehchi|Chenyan Xiong|Rebecca J. Stones|Boran Hou|Yunfan Long|Gang Wang|Yibo Kong|Rebecca J. Stones|Yunfan Long|Xiaoguang Liu|Bruno Martins|Gang Wang|João Magalhães|Xiaoguang Liu|Bruno Martins|Jamie Callan|Masoud Makrehchi|Chenyan Xiong
Proceedings of the 49th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2026, MelbourneVICAustralia, July 20-24, 2026

2025

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A Reproducibility Study on Consistent LLM Reasoning for Natural Language Inference over Clinical Trials.
Artur Guimarães|João Magalhães|Bruno Martins
Advances in Information Retrieval - 47th European Conference on Information Retrieval, ECIR 2025, Lucca, Italy, April 6-10, 2025, Proceedings, Part IV
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Aligning Web Query Generation with Ranking Objectives via Direct Preference Optimization.
João Coelho|Bruno Martins|João Magalhães|Chenyan Xiong
Proceedings of the 48th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2025, Padua, Italy, July 13-18, 2025

2023

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Conversational Search with Random Walks over Entity Graphs.
Gustavo Gonçalves|João Magalhães|Jamie Callan
Proceedings of the 2023 ACM SIGIR International Conference on Theory of Information Retrieval, ICTIR 2023, Taipei, Taiwan, 23 July 2023
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Rating Prediction in Conversational Task Assistants with Behavioral and Conversational-Flow Features.
Xiang Li|Rafael Ferreira|David Semedo|João Magalhães
Proceedings of the 46th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2023, Taipei, Taiwan, July 23-27, 2023
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Learning to Ask Questions for Zero-shot Dialogue State Tracking.
Diogo Tavares|David Semedo|Alexander Rudnicky|João Magalhães
Proceedings of the 46th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2023, Taipei, Taiwan, July 23-27, 2023

2022

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Open-domain conversational search assistants: the Transformer is all you need.
Rafael Ferreira|Mariana Leite|David Semedo|João Magalhães
Discover Computing 2022 Volume 25 Issue 2

2021

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Guest editorial: special issue on ECIR 2020.
Joemon M. Jose|Emine Yilmaz|João Magalhães|Pablo Castells
Discover Computing 2021 Volume 24 Issue 1
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Open-Domain Conversational Search Assistant with Transformers.
Rafael Ferreira|Mariana Leite|David Semedo|João Magalhães
Advances in Information Retrieval - 43rd European Conference on IR Research, ECIR 2021, Virtual Event, March 28 - April 1, 2021, Proceedings, Part I

2020

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Advances in Information Retrieval - 42nd European Conference on IR Research, ECIR 2020, Lisbon, Portugal, April 14-17, 2020, Proceedings, Part I
European Conference on Advances in Information Retrieval (ECIR) 2020
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Advances in Information Retrieval - 42nd European Conference on IR Research, ECIR 2020, Lisbon, Portugal, April 14-17, 2020, Proceedings, Part II
European Conference on Advances in Information Retrieval (ECIR) 2020
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NOVA at TREC 2020 Conversational Assistance Track.
Rafael Ferreira|David Semedo|João Magalhães
Proceedings of the Twenty-Ninth Text REtrieval Conference, TREC 2020, Virtual Event [Gaithersburg, Maryland, USA], November 16-20, 2020.

2019

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Dynamic-Keyword Extraction from Social Media.
David Semedo|João Magalhães
Advances in Information Retrieval - 41st European Conference on IR Research, ECIR 2019, Cologne, Germany, April 14-18, 2019, Proceedings, Part I
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A Benchmark of Visual Storytelling in Social Media.
Gonçalo Marcelino|David Semedo|André Mourão|Saverio G. Blasi|Marta Mrak|João Magalhães
Proceedings of the 2019 on International Conference on Multimedia Retrieval, ICMR 2019, Ottawa, ON, Canada, June 10-13, 2019.
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Towards Cloud Distributed Image Indexing by Sparse Hashing.
André Mourão|João Magalhães
Proceedings of the 2019 on International Conference on Multimedia Retrieval, ICMR 2019, Ottawa, ON, Canada, June 10-13, 2019.
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Proximity-Based Entity Ranking.
Gustavo Gonçalves|João Magalhães|Jamie Callan
Proceedings of the Twenty-Eighth Text REtrieval Conference, TREC 2019, Gaithersburg, Maryland, USA, November 13-15, 2019.
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Modeling Temporal Evidence from External Collections.
Flávio Martins|João Magalhães|Jamie Callan
Proceedings of the Twelfth ACM International Conference on Web Search and Data Mining, WSDM 2019, Melbourne, VIC, Australia, February 11-15, 2019

2018

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Balancing search space partitions by sparse coding for distributed redundant media indexing and retrieval.
André Mourão|João Magalhães
International Journal of Multimedia Information Retrieval (IJMIR) 2018 Volume 7 Issue 1
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Low-Complexity Supervised Rank Fusion Models.
André Mourão|João Magalhães
Proceedings of the 27th ACM International Conference on Information and Knowledge Management, CIKM 2018, Torino, Italy, October 22-26, 2018
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Patient-Age Extraction for Clinical Reports Retrieval.
Rúben Ramalho|André Mourão|João Magalhães
Advances in Information Retrieval - 40th European Conference on IR Research, ECIR 2018, Grenoble, France, March 26-29, 2018, Proceedings
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A Vertical PRF Architecture for Microblog Search.
Flávio Martins|João Magalhães|Jamie Callan
Proceedings of the 2018 ACM SIGIR International Conference on Theory of Information Retrieval, ICTIR 2018, Tianjin, China, September 14-17, 2018
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Ranking News-Quality Multimedia.
Gonçalo Marcelino|Ricardo Pinto|João Magalhães
Proceedings of the 2018 ACM on International Conference on Multimedia Retrieval, ICMR 2018, Yokohama, Japan, June 11-14, 2018
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Learning to rank clinical trials with rule-based criteria.
Gonçalo Araújo|André Mourão|João Magalhães
Proceedings of the Twenty-Seventh Text REtrieval Conference, TREC 2018, Gaithersburg, Maryland, USA, November 14-16, 2018
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Improving Ad Hoc Retrieval With Bag Of Entities.
Gustavo Gonçalves|João Magalhães|Chenyan Xiong|Jamie Callan
Proceedings of the Twenty-Seventh Text REtrieval Conference, TREC 2018, Gaithersburg, Maryland, USA, November 14-16, 2018
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Analysis of Subtopic Discovery Algorithms for Real-time Information Summarization.
Gustavo Gonçalves|Flávio Martins|João Magalhães
Companion Proceedings of the The Web Conference 2018, WWW 2018, Lyon , France, April 23-27, 2018

2017

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3D Facial Video Retrieval and Management for Decision Support in Speech and Language Therapy.
Ricardo Carrapiço|Isabel Guimarães|Margarida Grilo|Sofia Cavaco|João Magalhães
Proceedings of the 2017 ACM on International Conference on Multimedia Retrieval, ICMR 2017, Bucharest, Romania, June 6-9, 2017
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Balanced Search Space Partitioning for Distributed Media Redundant Indexing.
André Mourão|João Magalhães
Proceedings of the 2017 ACM on International Conference on Multimedia Retrieval, ICMR 2017, Bucharest, Romania, June 6-9, 2017
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NOVASearch at TREC 2017 Real-Time Summarization Track.
Gustavo Gonçalves|Flávio Martins|João Magalhães
Proceedings of The Twenty-Sixth Text REtrieval Conference, TREC 2017, Gaithersburg, Maryland, USA, November 15-17, 2017

2016

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NovaSearch at ImageCLEFmed 2016 Subfigure Classification Task.
David Semedo|João Magalhães
Working Notes of CLEF 2016 - Conference and Labs of the Evaluation forum, Évora, Portugal, 5-8 September, 2016.
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Jitter Search: A News-Based Real-Time Twitter Search Interface.
Flávio Martins|João Magalhães|Jamie Callan
Advances in Information Retrieval - 38th European Conference on IR Research, ECIR 2016, Padua, Italy, March 20-23, 2016. Proceedings
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Barbara Made the News: Mining the Behavior of Crowds for Time-Aware Learning to Rank.
Flávio Martins|João Magalhães|Jamie Callan
Proceedings of the Ninth ACM International Conference on Web Search and Data Mining, San Francisco, CA, USA, February 22-25, 2016

2015

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Learning Sentiment Based Ranked-Lexicons for Opinion Retrieval.
Filipa Peleja|João Magalhães
Advances in Information Retrieval - 37th European Conference on IR Research, ECIR 2015, Vienna, Austria, March 29 - April 2, 2015. Proceedings
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Explanatory opinions: to whom or what is all the fuzz about?
Filipa Peleja|Ioannis Arapakis|João Magalhães
Sixth BCS-IRSG Symposium on Future Directions in Information Access, FDIA 2015, 31 August - 4 September 2015, Thessaloniki, Greece
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High-Dimensional Indexing by Sparse Approximation.
Pedro Borges|André Mourão|João Magalhães
Proceedings of the 5th ACM on International Conference on Multimedia Retrieval, Shanghai, China, June 23-26, 2015
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Scalable Multimodal Search with Distributed Indexing by Sparse Hashing.
André Mourão|João Magalhães
Proceedings of the 5th ACM on International Conference on Multimedia Retrieval, Shanghai, China, June 23-26, 2015
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NovaSearch at TREC 2015 Clinical Decision Support Track.
André Mourão|Flávio Martins|João Magalhães
Proceedings of The Twenty-Fourth Text REtrieval Conference, TREC 2015, Gaithersburg, Maryland, USA, November 17-20, 2015

2014

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Reputation analysis with a ranked sentiment-lexicon.
Filipa Peleja|João Santos|João Magalhães
The 37th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR '14, Gold Coast , QLD, Australia - July 06 - 11, 2014
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NovaSearch at TREC 2014 Microblog Track: Reranking with Wikipedia Page Views.
Flávio Martins|João Magalhães
Proceedings of The Twenty-Third Text REtrieval Conference, TREC 2014, Gaithersburg, Maryland, USA, November 19-21, 2014
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NovaSearch at TREC 2014 Clinical Decision Support Track.
André Mourão|Flávio Martins|João Magalhães
Proceedings of The Twenty-Third Text REtrieval Conference, TREC 2014, Gaithersburg, Maryland, USA, November 19-21, 2014

2013

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Open research Areas in Information Retrieval, OAIR 2013, Lisbon, Portugal, May 15-17, 2013
Open research Areas in Information Retrieval (OAIR) 2013
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NovaSearch on Medical ImageCLEF 2013.
André Mourão|Flávio Martins|João Magalhães
Working Notes for CLEF 2013 Conference , Valencia, Spain, September 23-26, 2013.
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NovaSearch at TREC 2013 Microblog Track: Experiments with reranking using Wikipedia.
Flávio Martins|André Mourão|João Magalhães
Proceedings of The Twenty-Second Text REtrieval Conference, TREC 2013, Gaithersburg, Maryland, USA, November 19-22, 2013
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NovaSearch at TREC 2013 Federated Web Search Track: Experiments with rank fusion.
André Mourão|Flávio Martins|João Magalhães
Proceedings of The Twenty-Second Text REtrieval Conference, TREC 2013, Gaithersburg, Maryland, USA, November 19-22, 2013
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Using SKOS vocabularies for improving web search.
Bernhard Haslhofer|Flávio Martins|João Magalhães
22nd International World Wide Web Conference, WWW '13, Rio de Janeiro, Brazil, May 13-17, 2013, Companion Volume

2011

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Google, bing and a new perspective on ranking similarity.
Bruno Cardoso|João Magalhães
Proceedings of the 20th ACM Conference on Information and Knowledge Management, CIKM 2011, Glasgow, United Kingdom, October 24-28, 2011

2010

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An information-theoretic framework for semantic-multimedia retrieval.
João Magalhães|Stefan M. Rüger
ACM Transactions on Information Systems (TOIS) 2010 Volume 28 Issue 4

2009

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Web news categorization using a cross-media document graph.
José Iria|Fabio Ciravegna|João Magalhães
Proceedings of the 8th ACM International Conference on Image and Video Retrieval, CIVR 2009, Santorini Island, Greece, July 8-10, 2009

2007

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Information-theoretic semantic multimedia indexing.
João Magalhães|Stefan M. Rüger
Proceedings of the 6th ACM International Conference on Image and Video Retrieval, CIVR 2007, Amsterdam, The Netherlands, July 9-11, 2007
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GIR Experiments with Forostar.
Simon E. Overell|João Magalhães|Stefan M. Rüger
Advances in Multilingual and Multimodal Information Retrieval, 8th Workshop of the Cross-Language Evaluation Forum, CLEF 2007, Budapest, Hungary, September 19-21, 2007, Revised Selected Papers
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Exploring Image, Text and Geographic Evidences in ImageCLEF 2007.
João Magalhães|Simon E. Overell|Stefan M. Rüger
Working Notes for CLEF 2007 Workshop co-located with the 11th European Conference on Digital Libraries (ECDL 2007), Budapest, Hungary, September 19-21, 2007.
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GIR Experiments with Forostar at GeoCLEF 2007.
Simon E. Overell|João Magalhães|Stefan M. Rüger
Working Notes for CLEF 2007 Workshop co-located with the 11th European Conference on Digital Libraries (ECDL 2007), Budapest, Hungary, September 19-21, 2007.
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High-dimensional visual vocabularies for image retrieval.
João Magalhães|Stefan M. Rüger
SIGIR 2007: Proceedings of the 30th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, Amsterdam, The Netherlands, July 23-27, 2007

2006

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Logistic Regression of Generic Codebooks for Semantic Image Retrieval.
João Magalhães|Stefan M. Rüger
Image and Video Retrieval, 5th International Conference, CIVR 2006, Tempe, AZ, USA, July 13-15, 2006, Proceedings
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Forostar: A System for GIR.
Simon E. Overell|João Magalhães|Stefan M. Rüger
Evaluation of Multilingual and Multi-modal Information Retrieval, 7th Workshop of the Cross-Language Evaluation Forum, CLEF 2006, Alicante, Spain, September 20-22, 2006, Revised Selected Papers
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Place Disambiguation with Co-occurrence Models.
Simon E. Overell|João Magalhães|Stefan M. Rüger
Working Notes for CLEF 2006 Workshop co-located with the 10th European Conference on Digital Libraries (ECDL 2006), Alicante, Spain, September 20-22, 2006.

2005

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Mining multimedia salient concepts for incremental information extraction.
João Magalhães|Stefan M. Rüger
SIGIR 2005: Proceedings of the 28th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, Salvador, Brazil, August 15-19, 2005