query expansion การใช้

• Search engines invoke query expansion to increase the quality of user search results.
• Other research has shown that relevance feedback and query expansion can be integrated with extended Boolean query processing.
• Changing a query by adding terms and concepts to improve result relevance is called " query expansion ".
• Google applies query expansion to the submitted search query, transforming it into the query that will actually be used to retrieve results.
• This is done by query expansion, whose purpose is to convert the clue into a query expressed by a simplified and more appropriate language for Google.
• This trade-off is one of the defining problems in query expansion, regarding whether it is worthwhile to perform given the questionable effects on precision and recall.
• Technically LGTE is a layer on the top of Lucene and provides an extended Lucene API to integrate several services like snippets generation, query expansion, and many others.
• Pages which would not be included in the result set, which have the potential to be more relevant to the user's desired query, are included, and without query expansion would not have, regardless of relevance.
• The goal of query expansion in this regard is by increasing recall, precision can potentially increase ( rather than decrease as mathematically equated ), by including in the result set pages which are more relevant ( of higher quality ), or at least equally relevant.
• Critics state one of the problems is that the dictionaries and thesauri, and the stemming algorithm, are driven by human bias and while this is implicitly handled by the query expansion algorithm, this explicitly affects the results in a non-automated manner ( similar to how statisticians can'lie'with statistics ).
• It provides searches based on relevance or chronology; highlights text passages that match the query; collects and exports references seamlessly to RefWorks, EndNote, BibTex; searches for articles similar to a group of articles; and offers a slider to control query expansion with common synonyms, word variants, mesh terms, etc . Its content is updated weekly and can be downloaded and set up locally to run unlimited searches against Medline.