Using Dempster-shafer’s Belief-function Theory in Expert Systems
نویسنده
چکیده
The main objective of this paper is to describe how Dempster-Shafer’s (DS) theory of belief functions fits in the framework of valuation-based systems (VBS). Since VBS serve as a framework for managing uncertainty in expert systems, this facilitates the use of DS belief-function theory in expert systems.
منابع مشابه
Structures of rule - based belief functions by William
Shafer’s theory of evidential reasoning has recently received much attention as a possible model for probabilistic reasoning in expert system applications. This paper discusses the particular difficulties of implementing Shafer’s belief functions in the context of the most common form of expert system, rule-based systems. The two most important problems are: the representation of the expert’s s...
متن کاملbelief function and the transferable belief model
Beliefs are the result of uncertainty. Sometimes uncertainty is because of a random process and sometimes the result of lack of information. In the past, the only solution in situations of uncertainty has been the probability theory. But the past few decades, various theories of other variables and systems are put forward for the systems with no adequate and accurate information. One of these a...
متن کاملEntropy and Specificity in a Mathematical Theory of Evidence
We review Shafer’s theory of evidence. We then introduce the concepts of entropy and specificity in the framework of Shafer’s theory. These become complementary aspects in the indication of the quality of evidence.
متن کاملConditional independence in valuation-based systems
This paper introduces the concept of conditional independence in valuation-based systems (VBS). VBS is an axiomatic framework capable of representing many different uncertainty calculi. We define conditional independence in terms of factorization of the joint valuation. The definition of conditional independence in VBS generalizes the corresponding definition in probability theory. Besides prob...
متن کاملConditional Independence in Uncertainty Theories
This paper introduces the nolions of independence and conditional independence in valuation-based systems (VBS). VBS is an axiomatic framework capable of representing many different uncertainty calculi. We define independence and conditional independence in terms of factorization of the joint valuation. The definitions of independence and conditional independence in VBS generalize the correspon...
متن کامل