Lecture 5- Logical Agent Fuzzy Logic - I T 1 5 I I M RT A 3...

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MITI 5113 ARTIFICIAL INTEL LIGENCE LECTURE 5 LOGICAL AGENTS AND FUZZY LOGIC
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MITI 5113 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. 04/16/17 Slide 2/32
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MITI 5113 TRADITIONAL REPRESENTATION OF LOGIC Slow Fast Speed = 0 Speed = 1 bool speed; get the speed if ( speed == 0) { // speed is slow } else { // speed is fast } 04/16/17 Slide 3/32
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MITI 5113 FUZZY LOGIC REPRESENTATION For every problem must represent in terms of fuzzy sets. What are fuzzy sets? (see slide 10) Slowest Fastest Slow Fast [ 0.0 – 0.25 ] [ 0.25 – 0.50 ] [ 0.50 – 0.75 ] [ 0.75 – 1.00 ] 04/16/17 Slide 4/32
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MITI 5113 FUZZY LOGIC REPRESENTATION (CONT…) Slowest Fastest float speed; get the speed if ((speed >= 0.0)&&(speed < 0.25)) { // speed is slowest } else if ((speed >= 0.25)&&(speed < 0.5)) { // speed is slow } else if ((speed >= 0.5)&&(speed < 0.75)) { // speed is fast } else // speed >= 0.75 && speed < 1.0 { // speed is fastest } Slow Fast 04/16/17 Slide 5/32
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MITI 5113 Slide 6/32 A little History The idea behind fuzzy logic dates back to Plato, who recognized not only the logic system of true and false, but also an undetermined area – the uncertain. In the 1960’s Lotfi A. Zadeh Ph.D,. University of California, Berkeley, published an obscure paper on fuzzy sets . His unconventional theory allowed for approximate information and uncertainty when generating complex solutions; a process that previously did not exist. Fuzzy Logic has been around since the mid 60’s but was not readily excepted until the 80’s and 90’s. Although now prevalent throughout much of the world, China, Japan and Korea were the early adopters 04/16/17
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MITI 5113 Slide 7/32 04/16/17 Lofti A. Zadeh - The father Fuzzy Logic (Video).
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MITI 5113 Slide 8/32 04/16/17
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MITI 5113 Slide 9/32 04/16/17
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MITI 5113 ORIGINS OF FUZZY LOGIC Traces back to Ancient Greece Lotfi Asker Zadeh ( 1965 ) First to publish ideas of fuzzy logic. Professor Toshire Terano ( 1972 ) Organized the world's first working group on fuzzy systems.
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