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| - Extração de conhecimento (também conhecido como processo KDD, do inglês knowledge-discovery in databases) é um processo de extração de informações de base de dados, que cria relações de interesse que não são observadas pelo especialista no assunto, bem como auxilia a validação de conhecimento extraído. O produto esperado da extração de conhecimento é uma informação relevante para ser utilizada pelos tomadores de decisão. Alguns autores, porém, defendem o ponto de vista de que o conhecimento descoberto não precisa necessariamente ser incorporado a um sistema de apoio à decisão (SAD).
- Knowledge Discovery in Databases (KDD), auf Deutsch Wissensentdeckung in Datenbanken, ergänzt das oft synonym gebrauchte Data-Mining um vorbereitende Untersuchungen und Transformationen der auszuwertenden Daten. Ziel des KDD ist die Erkennung bislang unbekannter fachlicher Zusammenhänge aus vorhandenen, meist großen Datenbeständen. In Abgrenzung zum Data-Mining umfasst KDD als Gesamtprozess auch die Vorbereitung der Daten sowie die Bewertung der Resultate. Der Begriff KDD wurde in wissenschaftlichen Kreisen von Gregory Piatetsky-Shapiro geprägt, während in der Praxis der Begriff Data-Mining geläufiger ist, der in der Statistik jedoch traditionell negativ besetzt ist.
- L'extraction de connaissances est le processus de création de connaissances à partir d'informations structurées (bases de données relationnelles, XML) ou non structurées (textes, documents, images). Le résultat doit être dans un format lisible par les ordinateurs. Le groupe RDB2RDF W3C est en cours de standardisation d'un langage d'extraction de connaissances au format RDF à partir de bases de données. En français on parle d'« extraction de connaissances à partir des données » (ECD).
- Knowledge extraction is the creation of knowledge from structured (relational databases, XML) and unstructured (text, documents, images) sources. The resulting knowledge needs to be in a machine-readable and machine-interpretable format and must represent knowledge in a manner that facilitates inferencing. Although it is methodically similar to information extraction (NLP) and ETL (data warehouse), the main criteria is that the extraction result goes beyond the creation of structured information or the transformation into a relational schema. It requires either the reuse of existing formal knowledge (reusing identifiers or ontologies) or the generation of a schema based on the source data.
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| έχει περίληψη
| - L'extraction de connaissances est le processus de création de connaissances à partir d'informations structurées (bases de données relationnelles, XML) ou non structurées (textes, documents, images). Le résultat doit être dans un format lisible par les ordinateurs. Le groupe RDB2RDF W3C est en cours de standardisation d'un langage d'extraction de connaissances au format RDF à partir de bases de données. En français on parle d'« extraction de connaissances à partir des données » (ECD).
- Knowledge extraction is the creation of knowledge from structured (relational databases, XML) and unstructured (text, documents, images) sources. The resulting knowledge needs to be in a machine-readable and machine-interpretable format and must represent knowledge in a manner that facilitates inferencing. Although it is methodically similar to information extraction (NLP) and ETL (data warehouse), the main criteria is that the extraction result goes beyond the creation of structured information or the transformation into a relational schema. It requires either the reuse of existing formal knowledge (reusing identifiers or ontologies) or the generation of a schema based on the source data. The RDB2RDF W3C group is currently standardizing a language for extraction of RDF from relational databases. Another popular example for knowledge extraction is the transformation of Wikipedia into structured data and also the mapping to existing knowledge (see DBpedia and Freebase).
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![[RDF Data]](/fct/images/sw-rdf-blue.png)
