Between early 2007 and late 2014 I worked at the University of Amsterdam, first as a PhD student, later as a postdoctoral researcher. My research focuses on search technology, natural language processing, and machine learning. For an up-to-date list of publications and citations, visit my Google Scholar profile.

2016

Learning Dynamic Collective Entity Representations for Entity Ranking. David Graus, Manos Tsagkias, Wouter Weerkamp, Edgar Meij, and Maarten de Rijke. In the 9th ACM International Conference on Web Search and Data Mining (WSDM 2016). pdf

2015

Learning to Explain Entity Relationships in Knowledge Graphs. Nikos Voskarides, Edgar Meij, Manos Tsagkias, Maarten de Rijke, and Wouter Weerkamp. In 53rd Annual Meeting of the Association for Computational Linguistics (ACL 2015). pdf

What’s in a Domain? Analyzing Genre and Topic Differences in Statistical Machine Translation. Marlies van der Wees, Arianna Bisazza, Wouter Weerkamp, and Christof Monz. In 53rd Annual Meeting of the Association for Computational Linguistics (ACL 2015). pdf

2014

Time-Aware Rank Aggregation for Microblog Search. Shangsong Liang, Zhaochun Ren, Wouter Weerkamp, Edgar Meij, and Maarten de Rijke. In 23rd ACM Conference on Information and Knowledge Management (CIKM 2014). pdf

Recipient Recommendation in Enterprises using Communication Graphs and Email Content. David Graus, David van Dijk, Manos Tsagkias, Wouter Weerkamp, and Maarten de Rijke. In 37th Annual International ACM SIGIR Conference (SIGIR 2014). pdf

Query-dependent Contextualization of Streaming Data. Nikos Voskarides, Daan Odijk, Manos Tsagkias, Wouter Weerkamp, and Maarten de Rijke. In 36th European Conference on Information Retrieval (ECIR 2014). pdf

2013

Microblog Language Identification: Overcoming the Limitations of Short, Unedited and Idiomatic Text. Simon Carter, Wouter Weerkamp, and Manos Tsagkias. In Language Resources and Evaluation, 47(1), 2013. pdf

Pseudo Test Collections for Training and Tuning Microblog Rankers. Richard Berendsen, Manos Tsagkias, Maarten de Rijke, and Wouter Weerkamp. In 36th Annual International ACM SIGIR Conference (SIGIR 2013). pdf

Inside the World’s Playlist. Wouter Weerkamp, Manos Tsagkias, and Maarten de Rijke. In 22nd ACM Conference on Information and Knowledge Management (CIKM 2013). pdf

2012

Exploiting External Collections for Query Expansion. Wouter Weerkamp, Krisztian Balog, and Maarten de Rijke. In ACM Transactions on the Web, 6(4), 2012. pdf

Credibility-inspired Ranking for Blog Post Retrieval. Wouter Weerkamp and Maarten de Rijke. In Information Retrieval Journal, 15(3-4), 2012. pdf

Adding Semantics to Microblog Posts. Edgar Meij, Wouter Weerkamp, and Maarten de Rijke. In 5th ACM International Conference on Web Search and Data Mining (WSDM 2012). pdf

A Framework for Unsupervised Spam Detection in Social Networking Sites. Maarten Bosma, Edgar Meij, and Wouter Weerkamp. In 34th European Conference on Information Retrieval (ECIR 2012). pdf

Result Disambiguation in Web People Search. Richard Berendsen, Bogomil Kovachev, Evi Nastou, Maarten de Rijke, and Wouter Weerkamp. In 34th European Conference on Information Retrieval (ECIR 2012). pdf

Adaptive Temporal Query Modeling. Maria-Hendrike Peetz, Edgar Meij, Maarten de Rijke, and Wouter Weerkamp. In 34th European Conference on Information Retrieval (ECIR 2012). pdf

Activity Prediction: A Twitter-based Exploration. Wouter Weerkamp and Maarten de Rijke. In SIGIR 2012 Workshop on Time-aware Information Access (TAIA 2012). pdf

2011

Blog Feed Search with a Post Index. Wouter Weerkamp, Krisztian Balog, and Maarten de Rijke. In Information Retrieval Journal, 14(5). pdf

People Searching for People: Analysis of a People Search Engine Log. Wouter Weerkamp, Richard Berendsen, Bogomil Kovachev, Edgar Meij, Krisztian Balog, and Maarten de Rijke. In 34th Annual International ACM SIGIR Conference (SIGIR 2011). pdf

Hypergeometric Language Models for Republished Article Finding. Manos Tsagkias, Maarten de Rijke, and Wouter Weerkamp. In 34th Annual International ACM SIGIR Conference (SIGIR 2011). pdf

Classifying Queries Submitted to a Vertical Search Engine. Richard Berendsen, Bogomil Kovachev, Edgar Meij, Maarten de Rijke, and Wouter Weerkamp. In Web Science 2011. pdf

How People use Twitter in Different Languages. Wouter Weerkamp, Manos Tsagkias, and Simon Carter. In Web Science 2011. pdf

Twitter hashtags: Joint Translation and Clustering. Simon Carter, Manos Tsagkias, and Wouter Weerkamp. In Web Science 2011. pdf

Linking Online News and Social Media. Manos Tsagkias, Maarten de Rijke, and Wouter Weerkamp. In 4th ACM International Conference on Web Search and Data Mining (WSDM 2011). pdf

Incorporating Query Expansion and Quality Indicators in Searching Microblog Posts. Kamran Massoudi, Manos Tsagkias, Maarten de Rijke, and Wouter Weerkamp. In 33rd European Conference on Information Retrieval (ECIR 2011). pdf

Semi-Supervised Priors for Microblog Language Identification. Simon Carter, Manos Tsagkias, Wouter Weerkamp. In Dutch-Belgian Information Retrieval workshop (DIR 2011). pdf

2010

Generating Focused Topic-specific Sentiment Lexicons. Valentin Jijkoun, Maarten de Rijke, and Wouter Weerkamp. In 48th Annual Meeting of the Association for Computational Linguistics (ACL 2010). pdf

News Comments: Exploring, Modeling, and Online Predicting. Manos Tsagkias, Wouter Weerkamp, and Maarten de Rijke. In 32nd European Conference on Information Retrieval (ECIR 2010). pdf

A Two-Stage Model for Blog Feed Search. Wouter Weerkamp, Krisztian Balog, and Maarten de Rijke. In 33rd Annual International ACM SIGIR Conference (SIGIR 2010). pdf

Mining User Experiences from Online Forums: An Exploration. Valentin Jijkoun, Maarten de Rijke, Wouter Weerkamp, Paul Ackermans, Gijs Geleijnse. In NAACL HLT 2010 workshop on Computational Linguistics in a World of Social Media (#SocialMedia). pdf

2009

An Effective Coherence Measure to Determine Topical Consistency in User Generated Content. Jiyin He, Wouter Weerkamp, Martha Larson and Maarten de Rijke. In International Journal on Document Analysis and Recognition, 12(3). pdf

A Generative Blog Post Retrieval Model that Uses Query Expansion based on External Collections. Wouter Weerkamp, Krisztian Balog and Maarten de Rijke. In Joint conference of the 47th Annual Meeting of the Association for Computational Linguistics and the 4th International Joint Conference on Natural Language Processing of the Asian Federation of Natural Language Processing (ACL-IJCNLP 2009). pdf

Using Contextual Information to Improve Search in Email Archives. Wouter Weerkamp, Krisztian Balog and Maarten de Rijke. In 31st European Conference on Information Retrieval Conference (ECIR 2009). pdf

A Query Model Based on Normalized Log-Likelihood. Edgar Meij, Wouter Weerkamp, and Maarten de Rijke. In 18th ACM Conference on Information and Knowledge Management (CIKM 2009). pdf

Predicting the Volume of Comments on Online News Stories. Manos Tsagkias, Wouter Weerkamp, and Maarten de Rijke. In 18th ACM Conference on Information and Knowledge Management (CIKM 2009). pdf

Comparison of Retrieval-Based Hierarchical Clustering Approaches to Person Name Disambiguation. Christof Monz and Wouter Weerkamp. In 32nd Annual International ACM SIGIR Conference (SIGIR 2009). pdf

2008

Finding Key Bloggers, One Post at a Time. Wouter Weerkamp, Krisztian Balog, and Maarten de Rijke. In 18th European Conference on Articificial Intelligence (ECAI 2008). pdf

A Few Examples Go A Long Way: Constructing Query Models from Elaborate Query Formulations. Krisztian Balog, Wouter Weerkamp, and Maarten de Rijke. In 31st Annual International ACM SIGIR Conference (SIGIR 2008). pdf

Credibility Improves Topical Blog Post Retrieval. Wouter Weerkamp and Maarten de Rijke. In 46th Annual Meeting of the Association for Computational Linguistics: HLT (ACL 2008). pdf

Bloggers as Experts. Krisztian Balog, Wouter Weerkamp, and Maarten de Rijke. In 31st Annual International ACM SIGIR Conference (SIGIR 2008). pdf

Parsimonious Relevance Models. Edgar Meij, Wouter Weerkamp Krisztian Balog, and Maarten de Rijke. In 31st Annual International ACM SIGIR Conference (SIGIR 2008). pdf

PodCred: A Framework for Assessing Podcast Credibility. Manos Tsagkias, Martha Larson, Wouter Weerkamp, and Maarten de Rijke. In CIKM 2008 2nd Workshop on Information Credibility on the Web (WICOW 2008). pdf

Blogger, Stick to your Story: Modeling Topical Noise in Blogs with Coherence. Jiyin He, Wouter Weerkamp, Martha Larson, and Maarten de Rijke. In SIGIR 2008 Workshop on Analytics for Noisy Unstructured Text Data (AND 2008). pdf

Looking at Things Differently: Exploring Perspective Recall for Informal Text Retrieval. Wouter Weerkamp and Maarten de Rijke. In Proceedings of the 8th Dutch-Belgian Information Retrieval Workshop (DIR 2008). pdf

Web Corpus Cleaning using Content and Structure. Katja Hofmann and Wouter Weerkamp. In Building and Exploring Web Corpora (CleanEval 2007). pdf

PhD Thesis

Finding People and their Utterances in Social Media. University of Amsterdam, 2011. pdf (10MB)

Other activities

I’ve been a journal reviewer for the following journals: ACM Transactions on Internet Technology (TOIT), Language Resources and Evaluation (LREJ), Information Sciences (IS), Journal of the American Society for Information Science and Technology (JASIST), IEEE Transactions on Knowledge and Data Engineering (TKDE), ACM Transactions on Intelligent Systems and Technology (TIST), ACM Transactions on Information Systems (TOIS), IEEE Transactions on Information Forensics and Security (TIFS).

I served on the Program Committee of the following conferences: World Wide Web (WWW) 2015-2016; European Conference on Information Retrieval (ECIR) 2012, 2014-2016; ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR) 2009-2016; Web Search and Data Mining (WSDM) 2014-2015; ACM International Conference on Information and Knowledge Management (CIKM) 2011-2016; Annual Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies (NAACL HLT) 2016; IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM) 2015; International Conference on Knowledge Discovery and Information Retrieval (KDIR) 2015; International Society for Music Information Retrieval (ISMIR) 2015; Dutch-Belgian Information Retrieval workshop (DIR) 2011-2013; Conference of the European Chapter of the Association for Computational Linguistics (EACL) 2012; ACM Web Science Conference (WebSci) 2012; International Workshop on Web of Linked Entities (WoLE) 2012.

And I’ve been a co-organizer of ECIR 2014, CLEF 2011, and DIR 2011.