Question Answering with LCC's CHAUCER-2 at TREC 2007

CHAUCER is a Q/A system developed for (a) combining several strategies for modeling the target of a series of questions and (b) optimizing the extraction of answers. Targets were modeled by (1) topic signatures; (2) semantic types; (3) lexico-semantic patterns; (4) frame dependencies; and (5) predictive questions. Several strategies for answer extraction were also tried. The best-performing strategy was based on the use of textual entailment.

[1]  Sanda M. Harabagiu,et al.  Methods for Using Textual Entailment in Open-Domain Question Answering , 2006, ACL.

[2]  Oren Etzioni,et al.  A search engine for natural language applications , 2005, WWW '05.

[3]  Ido Dagan,et al.  The Third PASCAL Recognizing Textual Entailment Challenge , 2007, ACL-PASCAL@ACL.

[4]  Bonnie L. Webber,et al.  Experiments at the University of Edinburgh for the TREC 2006 QA Track , 2006, TREC.

[5]  Doug Downey,et al.  KnowItNow: Fast, Scalable Information Extraction from the Web , 2005, HLT.

[6]  Andrew Hickl,et al.  LCC's GISTexter at DUC 2006: Multi-Strategy Multi-Document Summarization , 2006 .

[7]  Dan Roth,et al.  Learning Question Classifiers , 2002, COLING.

[8]  Tat-Seng Chua,et al.  Generic soft pattern models for definitional question answering , 2005, SIGIR '05.

[9]  Eduard Hovy,et al.  Statistical QA - Classifier vs. Re-ranker: What’s the difference? , 2003, ACL 2003.

[10]  Soumen Chakrabarti,et al.  Enhanced Answer Type Inference from Questions using Sequential Models , 2005, HLT/EMNLP.

[11]  Andrew Hickl,et al.  A Discourse Commitment-Based Framework for Recognizing Textual Entailment , 2007, ACL-PASCAL@ACL.

[12]  Sanda M. Harabagiu,et al.  Machine Reading through Textual and Knowledge Entailment , 2007, AAAI Spring Symposium: Machine Reading.

[13]  Andrew Hickl,et al.  Recognizing Textual Entailment with LCC’s G ROUNDHOG System , 2005 .

[14]  Eduard H. Hovy,et al.  The Automated Acquisition of Topic Signatures for Text Summarization , 2000, COLING.

[15]  Sanda M. Harabagiu,et al.  Answering complex questions with random walk models , 2006, SIGIR '06.

[16]  Sanda M. Harabagiu,et al.  Incremental Topic Representations , 2004, COLING.

[17]  Jinxi Xu,et al.  TREC 2003 QA at BBN: Answering Definitional Questions , 2003, TREC.

[18]  Ani Nenkova,et al.  Evaluating Content Selection in Summarization: The Pyramid Method , 2004, NAACL.

[19]  Sanda M. Harabagiu,et al.  Negation, Contrast and Contradiction in Text Processing , 2006, AAAI.

[20]  Sanda M. Harabagiu,et al.  Employing Two Question Answering Systems in TREC 2005 , 2005, TREC.

[21]  Sanda M. Harabagiu,et al.  Experiments with Interactive Question-Answering , 2005, ACL.