Fuzzy Logic and Fuzzy Sets

Fuzzy Logic and Fuzzy Sets
108_FuzzyLogic.ppt (Size: 1.39 MB / Downloads: 130)
History
Lotfi Zadeh, at the University of California at Berkeley, first presented fuzzy logic in the mid1960's.
Zadeh developed fuzzy logic as a way of processing data. Instead of requiring a data element to be either a member or nonmember of a set, he introduced the idea of partial set membership.
In 1974 Mamdani and Assilian used fuzzy logic to regulate a steam engine.
In 1985 researchers at Bell laboratories developed the first fuzzy logic chip.
WHAT IS FUZZY LOGIC?
Definition of fuzzy
Fuzzy – “not clear, distinct, or precise; blurred”
Definition of fuzzy logic
A form of knowledge representation suitable for notions that cannot be defined precisely, but which depend upon their contexts.
Misconceptions and Controversies
Fuzzy logic is same as “imprecise logic
Fuzzy logic is a new way of expressing probability.
Fuzzy logic will be difficult to scale to larger problems.
Where is Fuzzy Logic used?
Fuzzy logic is used directly in very few applications.
Most applications of fuzzy logic use it as the underlying logic system for decision support systems.
Fuzzy System Applications
Cement Kiln  first expert system to use fuzzy logic
Sendai Subway  most celebrated fuzzy logic system
Bullet train between Tokyo and Osaka 

