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System Prototypes
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IntelliSearch is a complete and fully automated information retrieval system for the Web. It supports fast and accurate responses to queries addressing text and images in Web pages by incorporating state-of-the-art text and Web link information indexing and rertieval methods in conjunction with efficient ranking of Web pages and images by importance (authority). Searching by semantic similarity for discovering information related to user's requests (but not explicitly specified in the queries) is a distinguishing feature of the system. IntelliSearch stores a crawl of the Web with more than 1,5 million Web pages with images and is accessible on the Internet. It offers an ideal test-bed for experimentation and training and serves as a framework for a realistic evaluation of many Web image retrieval methods. [View System]
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Semantic Similarity relates to computing the similarity between concepts (terms) which are not necessarily lexically similar. We investigate approaches to computing semantic similarity by mapping terms to an ontology and by examining their relationships in that ontology. More specifically, we investigate approaches to computing the semantic similarity between natural language terms (using WordNet as the underlying reference ontology) and between medical terms (using the MeSH ontology of medical and biomedical terms). The most popular semantic similarity methods are implemented and evaluated using WordNet and MeSH. We also focus on cross ontology methods which are capable of computing the semantic similarity between terms stemming from different ontologies (WordNet and MeSH). This is a far more difficult problem (than in the single ontology) which has not been investigated adequately in the literature. X-Similarity, a novel cross-ontology similarity method is also a contribution of this work. [View System]
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Information Retrieval System for MedLine and Medical Information. MedSearch is a complete retrieval system for Medline, the premier bibliographic database of the U.S. National Library of Medicine (NLM). MedSearch implements the Semantic Similarity based Retrieval Model (SSRM), a novel information retrieval method for discovering similarities between documents containing semantically similar but not necessarily lexically similar terms. [View System]
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Web Summarization by Image Content. It is the process of extracting the most important or characteristic images from a Web site. This process is complementary to text summarization which works by extracting brief text summaries (e.g. important phrases or sentences) from Web sites. To the best of our knowledge, Web image summarization methods are not known to exist. This is exactly the problem this system is dealing with. [View System]
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