By Peter Jackson
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Extra resources for Natural Language Processing for Online Applications: Text Retrieval, Extraction, and Categorization
Qn formed by leaving out each of the query terms in turn, and then form the union of the documents. The set difference between this union and those documents returned by the original query form a useful pool in which to look for relevant documents not returned by the original query. Total system evaluation Precision and recall do not, in themselves, tell us whether a particular search engine is pleasant to use, or provides a cost-effective service. We shall not concern ourselves with user interface issues in this book, but screen design and general ergonomics are obviously important factors in user Document retrieval acceptance.
1. We now proceed to examine how such indexes are used at retrieval time. Query processing The first full-text document retrieval systems were ‘Boolean’ or ‘terms and connectors’ search engines. Such a designation characterizes properties of the query submitted to the system, rather than the mode of indexing employed. Boolean search A Boolean search is one in which the user searches a database with a query that connects words with operators, such as AND, OR, and NOT. Such a search is often called a ‘terms and connectors’ search, since there is a clear distinction made in the query between content-bearing terms and content-free operators based on logical connectives.
Copie Imprimable. Bureau du Secrétaire Général. Radiocommunication (ITU-R)Normalisation (ITU-T)Développement (ITU-D)Expositions et. int Chapter 2 D93-00013 MICROSOFT - BACKOFFICE: APPLICATION CENTER 1PROC . APPLICATION CENTER 1PROC . com/cat/software/suites... com Index of /∼ d93-msr Index of /∼d93-msr. Name Last modified Size Description. Parent Directory 06-Apr2001 00:14 - 2000/ 15-Dec-1999 16:56 - foton/ 04-Aug-2000 17:14 -... se Microsoft D93-00013 D9300013 Application Center 1proc . Microsoft D93-00013 d9300013 application center 1proc ..
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