Description of the LINK system used for MUC-5
نویسندگان
چکیده
Over the past five years, we have developed a natural language processing (NLP) syste m called LINK . LINK is a unification-based system, in which all syntactic and semantic analysi s is performed in a single step . Syntactic and semantic information are both represented in th e grammar in a uniform manner, similar to HPSG (Pollard and Sag, 1987) . LINK has been used in several information extraction applications . In a project with General Motors, LINK was used to process terse free-form descriptions of symptoms displayed b y malfunctioning automobiles, and the repairs which fixed them . In this very narrow domain , LINK achieved recall and precision rates of 80-85% . Most recently, we used the LINK system to participate in MUC-4 . During this competition , we developed initial versions of pre and postprocessing modules which were further developed in MUC-5 . In MUC-4, LINK achieved recall and precision rates of about 40% .
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Description of the LINK system used for MUC-4
The University of Michigan's natural language processing system, called LINK, is a unificationbased system which we have developed over the last four years . Prior to MUC-4, LINK had been used to extract information from free-form texts in two narrow application domains . One application corpus contained terse descriptions of symptoms displayed by malfunctioning automobiles, and the repairs whi...
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