1. Knowledge Acquisition in the Fuzzy Knowledge Representation Framework of a Medical Consultation System By: Karl Boegl, Klaus-Peter Adlassnig, Yoichi Hayashi, Thomas Rothenfluh, and Harald Leitich

2. MedFrame/CADIAG-IV - The predecessor: CADIAG-II - Consultation System - New Implementation - Generalized Domain Model - Fuzzy Dice

3. Definitions Fuzzy Set Theory Fuzzy Logic Fuzzy Control

4. Rule-Based Fuzzy Logic System Rules antecedent consequent Fuzzifier inference engine output processor

5. Fuzzy Logic Example tall(x) = { 0, if height(x) 7 ft. } Membership Function 1.0 + +------------------- | / 0.5 + / | / 0.0 +-------------+-----+------------------- | | 5.0 7.0 height, ft. -> Person Height degree of tallness -------------------------------------- Billy 3' 2" 0.00 Yoke 5' 5" 0.21 Drew 5' 9" 0.38 Erik 5' 10" 0.42 Mark 6' 1" 0.54 Kareem 7' 2" 1.00

6. Logic Operations in Fuzzy Logic truth (not x) = 1.0 - truth (x) truth (x and y) = minimum (truth(x), truth(y)) truth (x or y) = maximum (truth(x), truth(y))

7. Another Example old (x) = { 0, if age(x) < 18 yr. (age(x)-18 yr.)/42 yr., if 18 yr. 60 yr. } a = X is TALL and X is OLD b = X is TALL or X is OLD c = not (X is TALL) height age X is TALL X is OLD a b c ------------------------------------------------------------------------ 3' 2" 65 0.00 1.00 0.00 1.00 1.00 5' 5" 30 0.21 0.29 0.21 0.29 0.79 5' 9" 27 0.38 0.21 0.21 0.38 0.62 5' 10" 32 0.42 0.33 0.33 0.42 0.58 6' 1" 31 0.54 0.31 0.31 0.54 0.46 7' 2" 45 1.00 0.64 0.64 1.00 0.00 3' 4" 4 0.00 0.00 0.00 0.00 1.00

8. Representation within MedFrame/CADIAG-IV Positive Associations F P Consequent => Antecedent S P Antecedent => Consequent Negative Associations F N -(Consequent) => Antecedent S N Antecedent => -(Consequent)

9. Knowledge Refinements (1 of 2)

10. Knowledge Refinements (2 of 2)

11. Project Successes

12. References Title: Knowledge Acquisition in the Fuzzy Knowledge Representation Framework of a Medical Consultation System By: Karl Boegl, Klaus-Peter Adlassnig, Yoichi Hayashi, Thomas Rothenfluh, Harald Leitich Copyright: 2001 Title: The MedFrame Project http://medexpert.imc.akh-wien.ac.at/MedFrame/ By: Dieter Kopecky Copyright: 2000 Title: Medical Expert Systems http://www.computer.privateweb.at/judith/name_3.htm By: Judith Federhofer Copyright: 2002 (More)

13. References (continued) Title: Systematized Nomenclature of Medicine http://www.snomed.org By: College of American Pathologists Copyright: 2001-2003 http://www-2.cs.cmu.edu/Groups/AI/html/faqs/ai/fuzzy/part1/faq/html Mendel, Jerry. “Uncertainty in Fuzzy Logic Systems.” University of Southern California.