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Exercise Sheet 05 (Expert Systems)

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Exercises for Deductive Databases and Knowledge-Based Systems Institut für Informationssysteme – TU Braunschweig - http://www.ifis.cs.tu-bs.de

Exercise Sheet 05

(Expert Systems)

Please note: The exercises will be neither collected, corrected, nor graded.

Exercise 1 – Certainty Factor Model

a) What is the basic idea of the certainty factors approach?

b) Explain without formulas how belief, disbelief, and certainty factors are related. What do they mean? How do they relate to probability theory?

c) Explain why using a probabilistic approach seemed a bad idea for MYCIN?

Exercise 2 – Fuzzy Logics

a) What is a linguistic variable and why is it useful?

b) What is fuzzification and defuzzification?

c) What is a hedge and why is it useful?

Exercise 3 – Case-Based Reasoning

a) What is the main idea of CBR?

b) Briefly explain the 4-phase model.

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