For the first time , the fuzzy sets have been introduced by professor Lotfi Zadeh in 1965 and the aim of the fuzzy sets have been made a new way in explanation of daily uncertainities and ambiguties. The Fuzzy logic helps us with it's new way infacing of the problem of uncertainity and in confidency to design some controllers which act like a man against the problems. In this article we will pay to the fuzzy logic and system determination under the logic and we will use this way in determination of drum of besat power station's Boiler

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