On ordered weighted averaging aggregation operators in multicriteria decisionmaking
IEEE Transactions on Systems, Man and Cybernetics
Beyond min aggregation in multicriteria decision: (ordered) weighted min, discri-min, leximin
The ordered weighted averaging operators
FQUERY for Access: towards human consistent querying user interface
SAC '96 Proceedings of the 1996 ACM symposium on Applied Computing
Fuzziness in Database Management Systems
Fuzziness in Database Management Systems
Fuzzy Database Modeling
Recent Issues on Fuzzy Databases
Recent Issues on Fuzzy Databases
Conjunctive Aggregation of Extended Possibilistic Truth Values and Flexible Database Querying
FQAS '02 Proceedings of the 5th International Conference on Flexible Query Answering Systems
A Server for Fuzzy SQL Queries
FQAS '98 Proceedings of the Third International Conference on Flexible Query Answering Systems
Modelling uncertainty in multimedia database systems: an extended possibilistic approach
International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems
Advances In Fuzzy Object-oriented Databases: Modeling And Applications
Advances In Fuzzy Object-oriented Databases: Modeling And Applications
International Journal of Intelligent Systems
Flexible querying in a relational framework supported by possibilistic logic
Fuzzy Sets and Systems
Fuzzy sets in database and information systems: Status and opportunities
Fuzzy Sets and Systems
Aggregating constraint satisfaction degrees expressed by possibilistic truth values
IEEE Transactions on Fuzzy Systems
SQLf: a relational database language for fuzzy querying
IEEE Transactions on Fuzzy Systems
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Extended possibilistic truth values are a flexible means to model the certainty or uncertainty about the truth value of a proposition. With respect to flexible database querying, they are suited to express the extent to which a database instance satisfies a query condition. Since a flexible query can impose several conditions, each with different importance, weighted aggregation is necessary. In this paper, weighted aggregation of extended possibilistic truth values is presented. The impact of the weights on extended possibilistic truth values in both conjunctive and disjunctive aggregation is handled. It is illustrated that the different aggregation types require a different approach. Special care is given to the case where both conjunctive and disjunctive aggregation are mixed together. It is shown that the weights will have to be propagated throughout the calculations, but that this can cause basic properties, like associativity, to get lost. The problems that can arise are illustrated and solutions are proposed.