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What is PFCSP (Priority Fuzzy Constraint Satisfaction Problem)

Chapter 16
Handbook of Research on Fuzzy Information Processing in Databases
An expansion of FCSP by adding an importance degree to each of the constraints. In that manner, besides a satisfaction degree, each constraint has its importance value, its priority. They make decisions that depend not only on the satisfaction degree of each constraint (which is the case in FCSP), but also on the priority that each constraint has and are introduced by an axiomatic framework.
Published in Chapter:
Data Model of FRDB with Different Data Types and PFSQL
Aleksandar Takaci (University of Novi Sad, Serbia) and Srdan Škrbic (University of Novi Sad, Serbia)
Copyright: © 2008 |Pages: 28
DOI: 10.4018/978-1-59904-853-6.ch016
Abstract
This chapter introduces a way to extend the relational model with mechanisms that can handle imprecise, uncertain, and inconsistent attribute values using fuzzy logic. It describes details on how the relational model is extended in order to include fuzzy capabilities. In addition, we describe a query language called PFSQL for this fuzzy database model. Besides basic fuzzy capabilities, this query language adds the possibility to specify priorities for fuzzy statements. This appears to be the first implementation that has such capabilities. Also we describe the relations on FRDB (fuzzy relational database) and PFCSP (priority fuzzy constraint satisfaction problems) and GPFCSP (generalized priority fuzzy constraint satisfaction problems), theoretical concepts vital for the implementation of PFSQL. The authors propose several points in which this research and implementation can be continued and extended, contributing to better understanding of fuzzy database concepts and techniques and giving numerous possibilities for further development in this area.
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