I am a computer scientist who is passionate about doing research on natural language processing, biomedical informatics, and machine learning. In particular, I am interested in event semantics, open domain and clinical information extraction, commonsense causal reasoning, and unsupervised learning.

• Java implementation for assertion classification released. You can download the code from here or from UW BioNLP.
• Manuscript accepted for publication in the Journal of Biomedical Informatics, September 2012.
• Invited talk at the Biomedical and Health Informatics Lecture Series, Seattle, WA, April 17, 2012.
• Manuscript accepted for publication in the Journal of the American Medical Informatics Association, March 2012.
• Invited talk at Microsoft Research, NLP Seminar, Redmond, WA, March 22, 2012.
• Invited talk at the UW/Microsoft Symposium in Computational Linguistics, Seattle, WA, February 17, 2012.

2012

• Cosmin Adrian Bejan, Lucy Vanderwende, Fei Xia, and Meliha Yetisgen-Yildiz.
  Assertion modeling and its role in clinical phenotype identification. [ code ]
  Journal of Biomedical Informatics (JBI), 2012.
• Cosmin Adrian Bejan, Lucy Vanderwende, Mark M Wurfel, and Meliha Yetisgen-Yildiz.
  Assessing Pneumonia Identification from Time-Ordered Narrative Reports.
  Proceedings of the American Medical Informatics Association Fall Symposium (AMIA) , Chicago, IL, USA, November 2012.
• Cosmin Adrian Bejan, Lucy Vanderwende, Mark M Wurfel, and Meliha Yetisgen-Yildiz.
  Assessing Pneumonia Identification from Time-Ordered Narrative Reports. (Poster)
  The Pacific Northwest Regional NLP Workshop (NW-NLP), Microsoft Research, Redmond, WA, USA, May 2012.
• Cosmin Adrian Bejan, Fei Xia, Lucy Vanderwende, Mark M Wurfel, and Meliha Yetisgen-Yildiz.
  Pneumonia identification using statistical feature selection.
  Journal of the American Medical Informatics Association (JAMIA), 2012.
• Heather Evans, Meliha Yetisgen-Yildiz, Cosmin Adrian Bejan, Keir Warner, Robert Black, Ronald Maier, and Mark Wurfel.
  Chest X-ray Report Language is Incongruous with Quantitative Culture Results in Ventilator-Associated Pneumonia. (Extended Abstract)
  Proceedings of the 32nd Annual Meeting of the Surgical Infection Society, Dallas, TX, USA, April 2012.

2011

• Andrew S. Gordon, Cosmin Adrian Bejan, and Kenji Sagae.
  Commonsense Causal Reasoning Using Millions of Personal Stories. [ pdf ]
  Proceedings of the 25th AAAI Conference on Artificial Intelligence (AAAI), Special Track on AI and the Web, San Francisco, CA, USA, August 2011.
• Melissa Roemmele, Cosmin Adrian Bejan, and Andrew S. Gordon.
  Choice of Plausible Alternatives: An Evaluation of Commonsense Causal Reasoning. [ pdf ]
  Proceedings of the 2011 AAAI Spring Symposium on Logical Formalizations of Commonsense Reasoning (Commonsense), Stanford University, Palo Alto, CA, USA, March 2011.
• Kirk Roberts, Cosmin Adrian Bejan, and Sanda Harabagiu.
  Using Event Semantics for Toponym Disambiguation.
  In Applied Natural Language Processing: Identification, Investigation and Resolution, Philip M. McCarthy and Chutima Boonthum-Denecke (Eds.), IGI Global, 2011.
• Bryan Rink, Cosmin Adrian Bejan, and Sanda Harabagiu.
  The Role of Textual Graph Patterns in Discovering Event Causality.
  In Applied Natural Language Processing: Identification, Investigation and Resolution, Philip M. McCarthy and Chutima Boonthum-Denecke (Eds.), IGI Global, 2011.

2010

• Cosmin Adrian Bejan and Sanda Harabagiu.
  Unsupervised Event Coreference Resolution with Rich Linguistic Features. [ pdf | data ]
  Proceedings of the 48th Annual Meeting of the Association for Computational Linguistics (ACL), Uppsala, Sweden, July 2010.
• Kirk Roberts, Srikanth Gullapalli, Cosmin Adrian Bejan, and Sanda Harabagiu.
  A Linguistic Resource for Semantic Parsing of Motion Events. [ pdf ]
  Proceedings of the 7th International Conference on Language Resources and Evaluation (LREC), Valletta, Malta, May 2010.
• Bryan Rink, Cosmin Adrian Bejan, and Sanda Harabagiu.
  Learning Textual Graph Patterns to Detect Causal Event Relations. [ pdf ]
  Proceedings of the 23rd Florida Artificial Intelligence Research Society International Conference (FLAIRS), Applied Natural Language Processing Track, Daytona Beach, FL, USA, May 2010.
  Best paper in track award
• Kirk Roberts, Cosmin Adrian Bejan, and Sanda Harabagiu.
  Toponym Disambiguation Using Events. [ pdf ]
  Proceedings of the 23rd Florida Artificial Intelligence Research Society International Conference (FLAIRS), Applied Natural Language Processing Track, Daytona Beach, FL, USA, May 2010.
• Sanda Harabagiu and Cosmin Adrian Bejan.
  A Knowledge Extraction Framework for Biomedical Pathways. [ pdf ]
  Proceedings of the AMIA Summit on Translational Bioinformatics (AMIA-STB), San Francisco, CA, USA, March 2010.

2009

• Cosmin Adrian Bejan.
  Learning Event Structures from Text.
  PhD Thesis, The University of Texas at Dallas, December 2009.
• Cosmin Adrian Bejan, Matthew Titsworth, Andy Hickl, and Sanda Harabagiu.
  Nonparametric Bayesian Models for Unsupervised Event Coreference Resolution. [ pdf | data ]
  Proceedings of the Advances in Neural Information Processing Systems 23 (NIPS), Vancouver, Canada, December 2009.

2008

• Cosmin Adrian Bejan and Sanda Harabagiu.
  Using Clustering Methods for Discovering Event Structures. (Student Abstract) [ pdf ]
  Proceedings of the 23rd AAAI Conference on Artificial Intelligence (AAAI), Chicago, IL, USA, July 2008.
• Cosmin Adrian Bejan and Sanda Harabagiu.
  A Linguistic Resource for Discovering Event Structures and Resolving Event Coreference. [ pdf ]
  Proceedings of the 6th International Conference on Language Resources and Evaluation (LREC), Marrakech, Morocco, 2008.
• Cosmin Adrian Bejan.
  Unsupervised Discovery of Event Scenarios from Texts. [ pdf ]
  Proceedings of the 21st Florida Artificial Intelligence Research Society International Conference (FLAIRS), Applied Natural Language Processing Track, Coconut Grove, FL, USA, May 2008.
  Best paper in track award
  Best student paper award

2007

• Cosmin Adrian Bejan and Chris Hathaway.
  UTD-SRL: A Pipeline Architecture for Extracting Frame Semantic Structures. [ pdf ]
  Proceedings of the 4th International Workshop on Semantic Evaluations (SemEval ), ACL workshop, Prague, Czech Republic, June 2007.
• Cosmin Adrian Bejan.
  Deriving Chronological Information from Texts through a Graph-based Algorithm. (Poster) [ pdf ]
  Proceedings of the 20th Florida Artificial Intelligence Research Society International Conference (FLAIRS), Applied Natural Language Processing Track, Key West, FL, USA, May 2007.

2006

• Sanda Harabagiu and Cosmin Adrian Bejan.
  An Answer Bank for Temporal Inference. [ pdf ]
  Proceedings of the 5th International Conference on Language Resources and Evaluation (LREC), Genoa, Italy, 2006.

2005

• Sanda Harabagiu, Cosmin Adrian Bejan and Paul Morarescu.
  Shallow Semantics for Relation Extraction. [ pdf ]
  Proceedings of the 19th International Joint Conference on Artificial Intelligence (IJCAI), Edinburgh, Scotland, 2005.
• Sanda Harabagiu and Cosmin Adrian Bejan.
  Question Answering Based on Temporal Inference. [ pdf ]
  Proceedings of the AAAI Workshop on Inference for Textual Question Answering, Pittsburgh, PA, USA, 2005.

2004

• Cosmin Adrian Bejan, Alessandro Moschitti, Paul Morarescu, Gabriel Nicolae and Sanda Harabagiu.
  Semantic Parsing Based on FrameNet. [ pdf ]
  Proceedings of the 3rd International Workshop on the Evaluation of Systems for the Semantic Analysis of Text (SENSEVAL3), ACL workshop, pp 73-76, Barcelona, Spain, 2004.
• Alessandro Moschitti and Cosmin Adrian Bejan.
  A Semantic Kernel for Predicate Argument Classification. [ pdf ]
  Proceedings of the 8th Conference on Computational Natural Language Learning (CoNLL), pp 17-24, Boston, MA, USA, 2004.
• Sanda Harabagiu, Steven Maiorano, Alessandro Moschitti and Cosmin Adrian Bejan.
  Intentions, Implicatures and Processing of Complex Questions. [ pdf ]
  Proceedings of the HLT-NAACL Workshop on Pragmatics of Question Answering, pp 31-42, Boston, MA, USA, 2004.