Fuzzification represents the initial stage of the fuzzy inference process, wherein a numerical value of the input signal x ∗ (e.g., x ∗ = 8 with the historical values 5 , 7 , 8 of 3 previous observations—a value with a positive trend x ↑ ) is transformed into fuzzy input data.
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Approach Based on the Ordered Fuzzy Decision Making System Dedicated to Supplier Evaluation in Supply Chain Management.
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The sentences
In the case of a negative direction of a triangular OFN A ↓ = [ d , e , e , f ] , we have modified Prokopowicz’s definition of the direction determinant in order to indicate the manner in which a negative trend in a given value affects this value.
The numerical value of x ∗ is 8 , and it has a positive direction when the current quality of delivery is assessed at 8 points and an increasing trend in delivery time has been observed in k previous observations.