Publication Date
2008
Document Type
Dissertation
Committee Members
Guozhu Dong (Committee Member), Vasant Honavar (Committee Member), Michael Raymer (Committee Member), Amit Sheth (Advisor), Thaddeaus Tarpey (Committee Member), Shaojun Wang (Committee Member)
Degree Name
Doctor of Philosophy (PhD)
Abstract
The information access paradigm offered by most contemporary text information systems is a search-and-sift paradigm where users have to manually glean and aggregate relevant information from the large number of documents that are typically returned in response to keyword queries. Expecting the users to glean and aggregate information has lead to several inadequacies in these information systems. Owing to the size of many text databases, search-and-sift is a very tedious often requiring repeated keyword searches refining or generalizing queries terms. A more serious limitation arises from the lack of automated mechanisms to aggregate content across different documents to discover new knowledge. This dissertation focuses on processing text to assign semantic interpretations to its content (extracting Semantic metadata) and the design of algorithms and heuristics to utilize the extracted semantic metadata to support knowledge discovery operations over text content. Contributions in extracting semantic metadata in this dissertation cover the extraction of compound entities and complex relationships connecting entities. Extraction results are represented using a standard Semantic Web representation language (RDF) and are manually evaluated for accuracy. Knowledge discovery algorithms presented herein operate on RDF data. To further improve access mechanisms to text content, applications supporting semantic browsing and semantic search of text are presented.
Page Count
147
Department or Program
Department of Computer Science and Engineering
Year Degree Awarded
2008
Copyright
Copyright 2008, all rights reserved. This open access ETD is published by Wright State University and OhioLINK.
