Title: Semantic Similarity Measures in the Biomedical Domain by Leveraging a Web Search Engine
Authors: Hsieh, Sheau-Ling
Chang, Wen-Yung
Chen, Chi-Huang
Weng, Yung-Ching
National Chiao Tung University
NCTU/ITRI Joint Research Center
Keywords: Semantic similarity;support vector machine;page-count-based;corpus-based;web search engine
Issue Date: 1-Jul-2013
Abstract: Various researches in web related semantic similarity measures have been deployed. However, measuring semantic similarity between two terms remains a challenging task. The traditional ontology-based methodologies have a limitation that both concepts must be resided in the same ontology tree(s). Unfortunately, in practice, the assumption is not always applicable. On the other hand, if the corpus is sufficiently adequate, the corpus-based methodologies can overcome the limitation. Now, the web is a continuous and enormous growth corpus. Therefore, a method of estimating semantic similarity is proposed via exploiting the page counts of two biomedical concepts returned by Google AJAX web search engine. The features are extracted as the co-occurrence patterns of two given terms P and Q, by querying P, Q, as well as P AND Q, and the web search hit counts of the defined lexico-syntactic patterns. These similarity scores of different patterns are evaluated, by adapting support vector machines for classification, to leverage the robustness of semantic similarity measures. Experimental results validating against two datasets: dataset 1 provided by A. Hliaoutakis; dataset 2 provided by T. Pedersen, are presented and discussed. In dataset 1, the proposed approach achieves the best correlation coefficient (0.802) under SNOMED-CT. In dataset 2, the proposed method obtains the best correlation coefficient (SNOMED-CT: 0.705; MeSH: 0.723) with physician scores comparing with measures of other methods. However, the correlation coefficients (SNOMED-CT: 0.496; MeSH: 0.539) with coder scores received opposite outcomes. In conclusion, the semantic similarity findings of the proposed method are close to those of physicians' ratings. Furthermore, the study provides a cornerstone investigation for extracting fully relevant information from digitizing, free-text medical records in the National Taiwan University Hospital database.
URI: http://dx.doi.org/10.1109/JBHI.2013.2257815
ISSN: 2168-2194
DOI: 10.1109/JBHI.2013.2257815
Volume: 17
Issue: 4
Begin Page: 853
End Page: 861
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