A Possibilistic Valid-Time Model

  • José Enrique Pons
  • Christophe Billiet
  • Olga Pons Capote
  • Guy De Tré
Part of the Communications in Computer and Information Science book series (CCIS, volume 297)


Information in databases can be imperfect and this imperfection has several forms and causes. In some cases, a single value should be stored, but it is (partially) unknown. The uncertainty about which value to store leads to the aforementioned imperfection. In temporal databases, uncertainty can arise, concerning which temporal notion needs to be stored. Because in temporal databases, temporal notions influence the consistency with which the database models the reality, this uncertainty has a direct impact on the consistency of the model. To represent this temporal uncertainty, previous works have adapted fuzzy sets with conjunctive interpretation, an approach that might prove misleading. This work presents a model that represents the uncertainty using possibility and necessity measures, which are fuzzy sets with disjunctive interpretations.


temporal databases fuzzy databases information systems incompleteness 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • José Enrique Pons
    • 1
  • Christophe Billiet
    • 2
  • Olga Pons Capote
    • 1
  • Guy De Tré
    • 2
  1. 1.Department of Computer Science and Artificial IntelligenceUniversidad de Granada, Escuela Técnica Superior de Ingeniería InformáticaGranadaSpain
  2. 2.Department of Telecommunications and Information ProcessingGhent UniversityGhentBelgium

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