Universitšt Karlsruhe
Unscharfes Schließen mit komplexen Wissensbasen


[1]Martin Spott, Unscharfes Schließen mit komplexen Wissensbasen, Jul 1994.


Possibility distributions form a widely accepted method for representing a certain type of uncertain knowledge. As yet, most mechanisms for processing possibility distributions have been founded on intuitive argumentation only. As a solution a comprehensive, mathematically sound theory of possibility distributions is proposed that is based on three simple axioms and the Principle of Minimal Specificity. Possibilistic knowledge-bases are represented by sets of possibility distributions. Inferring information from a knowledge-base is interpreted as combining its possibility distributions into the most specific one we are allowed to infer. On these assumptions it is shown in particular that the max-min-composition is an unambiguous mechanism for the aggregation of possibility distributions that are defined on different and freely chosen subspaces of a given cartesian product of universes. A special type of possibility distribution (Possibilistic Relation of Dependence or PROD) is postulated as a description of dependencies between variables. They play an important role in a theory of possibilistic fuzzy systems that is presented as a general framework for fuzzy modeling of real-world problems. The last chapter is dedicated to rule-based reasoning in the possibilistic setting, especially the use of the Gödel-relation for inference.

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Dr. Martin Spott