Fuzzy recursive relationships in relational databases

• Autorzy: Myszkorowski K.

Identyfikatory

DOI

10.22630/ISIM.2018.7.1.4

• Języki publikacji: EN

Abstrakty

EN

Recursive relationships are used for modelling problems coming from the real life, such as, for example, a relationship describing formal dependencies between employees of an enterprise, where creation of work groups and teams requires analysis of many elements. In conventional database systems, the precision of data is assumed. If our knowledge of the fragment of reality to be modelled is imperfect one should apply tools for describing uncertain or imprecise information. One of them is the fuzzy set theory. The paper deals with recursive relationships in fuzzy databases. The analysis is performed with the use of the theory of interval-valued fuzzy sets. A definition of a fuzzy interval recursive relationship has been presented. The paper defines different connections of entities which participate in such relationships. Operations of the extended relational algebra are also discussed.

Słowa kluczowe

EN

fuzzy databases; interval-valued fuzzy sets; recursive relationships; relational algebra; fixpoint operator

• Wydawca: Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
• Czasopismo: Information Systems in Management
• Rocznik: 2018
• Tom: Vol. 7, No. 1
• Strony: 35--46
• Opis fizyczny: Bibliogr. 15 poz., tab., rys.

Twórcy

autor

Myszkorowski K.

• Institute of Information Technology, Lodz University of Technology

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).