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Inverted index is the most popular index structure in search engine. Applying index compression can reduce storage space on inverted index, and improve the search performance. In this paper, we compare three typical index compression schemes in Lucene-the open source information retrieval system. First, index compression schemes are realized in Lucene. Then we present the comparison results of these...
Ontological resources such as controlled vocabularies, taxonomies and ontologies from the OBO foundry are used to represent biomedical domain knowledge. The development of such resources is a time consuming task. Once they are finished they contribute to standardization of information representation, interoperability of IT solutions, literature analysis and knowledge discovery. Text mining comprises...
In this work we designed an information retrieval system ldquoPIRSrdquo - precision information retrieval system - based on the modified vector space model introducing a new query weighting formula and similarity function. These modifications of the classical vector space model aimed to improve the average precision level of the system. Two well known IR parameters, precision and recall were used...
Proper nouns are usually primary keys in a query. Their correct translation might be necessary to maintain a good retrieval performance in a cross language information retrieval (CLIR) system. However, dictionaries only include the most commonly used proper nouns, like major countries and capitals. As they are spelling variants of each other in most languages, using an approximate string matching...
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