Investigation of the index structure of Drugdoc and Ringdoc

A comparative study was performed on the index structure of Drugdoc and Ringdoc based on the output of both systems on the same nine articles. In both systems major and secondary indexing terms are used as descriptors for biomedical and pharmaceutical context, and alphanumeric codes for showing the concept and viewpoint of the article. Ringdoc is superior in coding of drugs and pharmaceutical information as its descriptors have hierarchical relations, multifacet coding is performed, and synonyms are selected. Medical term related descriptors are more abundant in Drugdoc, including synonyms and analogous words, but no hierarchy is seen. Ringdoc selectively chooses descriptors related to the main theme of the article, whereas Drugdoc chooses descriptors comprehensively throughout the article.