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Chapter 5:Inexact Reasoning

Expert Systems: Principles and Programming, Fourth Edition

Expert Systems: Principles and Programming, Fourth Edition

2

Objectives

Explore the sources of uncertainty in rules

Analyze some methods for dealing with uncertainty

Learn about the Dempster-Shafer theory

Learn about the theory of uncertainty based on fuzzy logic

Discuss some commercial applications of fuzzy logic

Expert Systems: Principles and Programming, Fourth Edition

3

Uncertainty and Rules

We have already seen that expert systems can operate within the realm of uncertainty.

There are several sources of uncertainty in rules:

Uncertainty related to individual rules

Uncertainty due to conflict resolution

Uncertainty due to incompatibility of rules

Expert Systems: Principles and Programming, Fourth Edition

4

Figure 5.1 Major Uncertainties in Rule-Based Expert Systems