Abstract
In this chapter, we propose an approach to query a database where the user preferences can be bipolar (i.e., express both constraints and wishes about the desired result) and the data stored in the database can be uncertain. Query results are then completely ordered with respect to these bipolar preferences, giving priority to constraints over wishes. Furthermore, we consider user preferences expressed on a domain of values which is not “flat”, but contains values that are more specific than others according to the “kind of” relation. These preferences are represented by specific fuzzy sets, called “Hierarchical Fuzzy Sets” and defined over a simple ontology. We propose a use of “Hierarchical Fuzzy Sets” for query enlargement purposes. The approach is illustrated on a real-world problem concerning the selection of optimal packaging material for fresh fruits and vegetables.
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Notes
- 1.
Note that since \(\le _c\) and \(\le _w\) are complete pre-orderings, each constraint/wish has a well-defined rank.
- 2.
Here, we adopt the usual notation \((x,y)\) for specifying fuzzy sets over symbolic variables, where \((x,y)\) means that modality \(x\) has membership value \(y\).
- 3.
No preferences means here that all constraints (or wishes) have the same rank, i.e., are of equal importance.
- 4.
A T-norm \(\top :\) [0, 1]\(^2\) to [0, 1] is an associative, commutative operator that has \(1\) for neutral element and \(0\) for absorbing element.
- 5.
The shift loop (Lines 3-5) is there to keep the same indexing of subsets \({\fancyscript{T}}_j\)
- 6.
A measure of the ability of a package to conduct gas fluxes.
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Acknowledgments
The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/ 2007-2013) under the grant agreement FP7-265669-EcoBioCAP project.
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Buche, P., Destercke, S., Guillard, V., Haemmerlé, O., Thomopoulos, R. (2014). Flexible Bipolar Querying of Uncertain Data Using an Ontology. In: Pivert, O., Zadrożny, S. (eds) Flexible Approaches in Data, Information and Knowledge Management. Studies in Computational Intelligence, vol 497. Springer, Cham. https://doi.org/10.1007/978-3-319-00954-4_8
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