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2. Ranking (information retrieval) - Wikipedia

   en.wikipedia.org/.../Ranking_(information_retrieval)

   Ranking of query is one of the fundamental problems in information retrieval (IR), [1] the scientific/engineering discipline behind search engines. [2] Given a query q and a collection D of documents that match the query, the problem is to rank, that is, sort, the documents in D according to some criterion so that the "best" results appear early in the result list displayed to the user.

3. Medical literature retrieval - Wikipedia

   en.wikipedia.org/wiki/Medical_literature_retrieval

   Medical literature retrieval or medical document retrieval is an activity that uses professional methods for medical research papers retrieval, report and other data to improve medicine research and practice.

4. Wide area information server - Wikipedia

   en.wikipedia.org/wiki/Wide_area_information_server

   Wide Area Information Server (WAIS) is a client–server text searching system that uses the ANSI Standard Z39.50 Information Retrieval Service Definition and Protocol Specifications for Library Applications" (Z39.50:1988) to search index databases on remote computers.

5. Relevance (information retrieval) - Wikipedia

   en.wikipedia.org/wiki/Relevance_(information...

   The global interpretation assumes that there exist some fixed set of underlying topics derived from inter-document similarity. These global clusters or their representatives can then be used to relate relevance of two documents (e.g. two documents in the same cluster should both be relevant to the same request). Methods in this spirit include:

6. Image retrieval - Wikipedia

   en.wikipedia.org/wiki/Image_retrieval

   An image retrieval system is a computer system used for browsing, searching and retrieving images from a large database of digital images. Most traditional and common methods of image retrieval utilize some method of adding metadata such as captioning, keywords, title or descriptions to the images so that retrieval can be performed over the annotation words.

7. Text mining - Wikipedia

   en.wikipedia.org/wiki/Text_mining

   A typical application is to scan a set of documents written in a natural language and either model the document set for predictive classification purposes or populate a database or search index with the information extracted. The document is the basic element when starting with text mining. Here, we define a document as a unit of textual data ...