S known as the function A : U x [0, 1] and defined as A ( x ) = sup Jx , x U x . Type-2 fuzzy set A will be interval if A ( x, u) = 1 x U x , u Jx . Time Nimbolide Technical Information series modeling needs to define interval fuzzy sets and their shape. Figure 1 shows the look from the sets.Figure 1. The shape from the upper and reduced membership functions.Triangular fuzzy sets are defined as follows:u u u l l l l Ai = ( AU , AiL ) = (( ai1 , ai2 , ai3 , h( AU )), ( ai1 , ai2 , ai3 , h( Ai ))). i i(5)u u u l l l exactly where AU and AiL are triangular type-1 fuzzy sets, ai1 , ai2 , ai3 , ai1 , ai2 , ai3 are reference points i i , and h would be the maximum worth with the membership function of of type-2 interval fuzzy set A the element ai (for the upper and decrease membership functions, respectively), means that ( A)i depends of height of triangle.Mathematics 2021, 9,five ofAn operation of combining fuzzy sets of sort two is expected when functioning having a rule base depending on the values of a time series. The combined operation is defined as follows: L L A1 A2 = ( AU , A1 ) ( AU , A2 ) 2u u u u u u = (( a11 a21 , a12 a22 , a13 a23 ; min(h1 ( AU ), h1 ( AU ))), min(h2 ( AU ), h2 ( AU ))); 2 2 1 1 l l l l l l ( a11 a21 , a12 a22 , a13 a23 ; L L L L min(h1 ( A1 ), h1 ( A2 )), min(h2 ( A1 ), h2 ( A2 )));Proposition 1. A fuzzy time series model, reflecting the context with the challenge domain, is going to be described by two sets of type-2 fuzzy labels: ts = ( A, AC ),(6)where A–a set of type-2 fuzzy sets describing the tendencies from the time series obtained from the analysis of the points of your time series, | A| = l – 1; AC –a set of type-2 fuzzy sets describing the trends of the time series obtained in the context of your trouble domain of the time series, | AC | l – 1. The component A of model (6) is extracted from time series values by fuzzifying all numerical representations from the time series tendencies. By the representation of info granules within the kind of fuzzy tendencies with the time series (1), the numerical values of the tendencies are fuzzified: At = Tendt ) = tst – tst-1 ), t 0. C of model (6) by expert or analytical techniques is formed as well as the component A describes probably the most common behavior with the time series. This component is required for solving problems: Justification of your option with the boundaries with the type-2 fuzzy set intervals when modeling a time series. Analysis and forecasting of a time series using a lack of data or when they are noisy. Thus, the time series context, represented by the element AC of model (6), is determined by the following parameters: C Rate of tendency alter At . Quantity of tendency modifications | AC |.four. Modeling Algorithm The modeling procedure includes the following measures: 1. two. three. Check the constraints in the time series: discreteness; length getting far more than two values. Calculate the tendencies Tendt with the time series by (3) at each AS-0141 Formula moment t 0. Ascertain the universe for the fuzzy values with the time series tendencies: U = Ai , i are offered by N could be the quantity of fuzzy sets in the universe. Type-2 fuzzy sets A membership functions of a triangular kind, and at the second level, they’re intervals; see Figure 1. By an professional or analytical strategy, get the rules from the time series as a set of C C C C pairs of type-2 fuzzy sets: RulesC = Rr , r N, exactly where Rr is really a pair ( Ai , AC ), Ai is k C will be the consequent on the guidelines and i, k would be the indices the antecedent of th.
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