Measuring Semantic Similarity in Ontology and Its Application in Information Retrieval

RDF defines a frame model supporting semantic interoperability. Using the RDF, a calculation of semantic similarity between concepts in ontology is presented by the hierarchy of ontology concepts. To make the calculation of semantic similarity between concepts more similar to human's subjective judgment, the similarity be measured by word form or semantic methods. Whether the word to be compared is a compound word or not can be determined by WordNet before calculating word semantic similarity. If the words to be compared contain a compound word, the compound word should be divided into word sequence and the stop words should be removed in the sequence. Then the key part set and the non-key part can be gained by syntax analysis. In the experiment, the algorithm gets the best result, which fits human's judgment. This paper represents the steps which use semantic similarity in semantic search executing.