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AssigneeThe Regents of the University of California
InventorsWesley W. Chu, Zhenyu Liu, Qinghua Zou
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A system and method for automatically extracting relevant key concepts from a free-text document and indexing the document using the extracted key concepts. The indexing mechanism applies syntactic and semantic filters to filter out irrelevant terms. The remaining terms are deemed to be key concepts for the free-text document. An input search query is compared against the key concepts extracted for the free-text document for determining whether the document satisfies the query. Prior to applying the search query, additional scenario-specific terms are added to the search query in order to improve retrieval performance. The query expansion mechanism generates a list of candidate expansion concepts, filters the list of candidate expansion concepts based on a user-entered scenario concept, and expands the input query based on the candidate expansion concepts remaining after the filtering process.
A computer system for identifying flee-text documents, the system comprising:
A method executed by one or more computers for identifying free-text documents, the method comprising:
A query expansion method in a system having a knowledge source storing a plurality of concepts formed from a predefined vocabulary set, the knowledge source maintaining a plurality of relationship links wherein each relationship link defines a relationship between a first grouping of the concepts and a second grouping of the concepts, the method comprising:
A system for identifying free-text documents, the system comprising:
Dependencies are inferred from the claim text.