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I am now a PostDoc researcher at Ontario Cancer Institute.
I am a PhD student in the Computational Linguistics group at the Department of Computer Science, University of Toronto. My supervisor is Professor Graeme Hirst. Before I came to Canada, I studied in the Center for Advanced Information Systems at Nanyang Technological University, Singapore.
Current Research: Non-factoid Question Answering
In contrast to fact-based question-answering, answers to non-factoid questions are not
named entities. Multiple pieces of information from multiple sources are often needed to construct
an answer.
Previous Research: Information Extraction from Medical Text
Automatically extract causal information from Medline abstracts.
Publications
Niu, Y. Analysis of semantic classes: toward non-factoid question answering. Ph.D. thesis. (pdf)
Niu, Y., Hirst, G. Identifying cores of semantic classes in unstructured text with a semi-supervised learning approach. In RANLP2007, Borovets, Bulgaria. 418-424. (pdf)
Niu, Y., Zhu, X.D., Hirst, G. Using outcome polarity in sentence extraction for medical question-answering. In AMIA2006, Washington, D.C. 599-603. (pdf)
Niu, Y., Zhu, X.D., Li, J.H., Hirst, G. Analysis of polarity information in medical text. In AMIA2005, Washington, D.C. 570-574. (pdf)
Niu Y.,Hirst G. Analysis of semantic classes in medical text for question answering. In ACL2004 Workshop on Question Answering in Restricted Domains, Barcelona, Spain. 54-61. (pdf)
Niu Y.,Hirst G.,McArthur G.,Rodriguez-Gianolli P. (2003). Answering Clinical Questions with Role Identification, In ACL2003 Workshop on Natural Language Processing in Biomedicine, Sapporo, Japan. 73-80. (pdf)
Niu Y. Question Answering in Medicine, Technical Report for the Oral Qualification Exam, Department of Computer Science, University of Toronto, December 2002. (ps)
Khoo S.G. C.,Chan S.,Niu Y. The Many Facets of the Cause-Effect Relation, The Semantics of Relationships (an Interdisciplinary Perspective). Kluwer Academic Publishers, 2002. 51-70.
Khoo S.G. C.,Chan S.,Niu Y. Extracting Causal Knowledge from a Medical Database Using Graphical Patterns, In ACL2000, Hong Kong, China. 336-344. (pdf)
Last updated 06/08/2006