Read e-book online Advanced Concepts in Fuzzy Logic and Systems with Membership PDF

By Janusz T. Starczewski

ISBN-10: 3642295193

ISBN-13: 9783642295195

ISBN-10: 3642295207

ISBN-13: 9783642295201

This booklet generalizes fuzzy good judgment structures for various different types of uncertainty, including

- semantic ambiguity as a result of constrained belief or lack of knowledge approximately unique club functions

- loss of attributes or granularity bobbing up from discretization of genuine data

- vague description of club functions

- vagueness perceived as fuzzification of conditional attributes.

Consequently, the club uncertainty could be modeled by way of combining tools of traditional and type-2 fuzzy common sense, tough set idea and risk theory.

In specific, this e-book offers a few formulae for enforcing the operation prolonged on fuzzy-valued fuzzy units and provides a few simple buildings of generalized doubtful fuzzy good judgment platforms, in addition to introduces numerous of ways to generate fuzzy club uncertainty. it's fascinating as a reference publication for under-graduates in greater schooling, grasp and healthcare professional graduates within the classes of machine technology, computational intelligence, or fuzzy keep watch over and category, and is mainly devoted to researchers and practitioners in undefined.

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Additional info for Advanced Concepts in Fuzzy Logic and Systems with Membership Uncertainty

Example text

1) to the minimum, the maximum and a continuous, strictly monotone and involutive complement neg(u) ≡ 1 − u. Let I ([0, 1]) denote the set of all subintervals of the unit interval. 8) ∀ [u, u] , [v, v] ∈ I ([0, 1]). In the context of intervals, we refer to these operations as an extended minimum, an extended maximum, and an extended negation. 36 2 Algebraic Operations on Fuzzy Valued Fuzzy Sets The operations on interval-valued fuzzy sets are well defined and elaborated [Dziech and Gorzalczany 1987; Gorzalczany 1987; Karnik and Mendel 2000; Uncu and T¨ urk¸sen 2007; Walker and Walker 2009; Zadeh 1975].

5 Fig. 38) otherwise μT˜L min (F,G) (w) = 1 w=0 mF +mG −1+ΔF R +ΔGR −w ΔF R +ΔGR elsewhere. 38) remains a triangular membership function. 39) requires some approximation to a triangular shape. A simple approximation method allowed us for implementation of efficient triangular type-2 fuzzy logic systems [Starczewski 2009a; Starczewski and Rutkowski 2002; Starczewski 2006]. To extend the following result on trapezoidal fuzzy truth intervals we provide the following example. 3. Consider two fuzzy truth intervals with trapezoidal membership r F L nF +ΔF −u and g (v) = , functions defined as, f (u) = min u−mΔFF+Δ Δr L v−mG +ΔlG nG +ΔGR −v , ΔGR ΔlG F min .

Reflexive, symmetric and transitive, characterized by its membership function μR . 60) μRα (A) (x) = inf {μA (y) |μR (x, y) ≥ α} . 61) From this definition, the following properties follow directly. 1. e. μRα (A) (x) ≥ β ⇐⇒ ∃y : (x, y) ≥ Rα and μA (y) ≥ β. 2. e. μRα (A) (x) ≥ β ⇐⇒ ∀y : (x, y) ≥ Rα and μA (y) ≥ β. Note that the original definition of a fuzzy-rough set is valid for single fuzzy relation R. Extending this, many fuzzy equivalence relations Ri forms a fuzzy partition Φ on X, which is put up by fuzzy sets Fi .

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Advanced Concepts in Fuzzy Logic and Systems with Membership Uncertainty by Janusz T. Starczewski

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