Adrian I. Ban and Delia A. Tuşe
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1 18 th Int. Conf. on IFSs, Sofia, May 2014 Notes on Intuitionistic Fuzzy Sets ISSN Vol. 20, 2014, No. 2, Trapezoidal/triangular intuitionistic fuzzy numbers versus interval-valued trapezoidal/triangular fuzzy numbers applications to multicriteria decision making methods Adrian I. Ban Delia A. Tuşe Department of Mathematics Informatics, niversity of Oradea niversităţii 1, Oradea, Romania s: Abstract: We establish relationships between the set of trapezoidal intuitionistic fuzzy numbers the set of interval-valued trapezoidal fuzzy numbers, on the other h, between the set of triangular intuitionistic fuzzy numbers the set of triangular fuzzy numbers. Based on these main results of the paper, the methods or procedures elaborated for interval-valued trapezoidal or triangular fuzzy numbers as input data can be easy transferred to the case of trapezoidal or triangular intuitionistic fuzzy numbers as input data. We exemplify by transferring an interval-valued trapezoidal multicriteria decision making method in a trapezoidal intuitionistic fuzzy method. Keywords: Trapezoidal/triangular fuzzy number, Trapezoidal/triangular intuitionistic fuzzy number, Interval-valued trapezoidal/triangular fuzzy number. AMS Classification: 03E72, 62C86. 1 Introduction Among various generalizations of fuzzy sets such as intuitionistic fuzzy sets interval-valued fuzzy sets have gained more attention from researchers. On the other h, the practitioners are interested to elaborate methods procedures with input output data in simple form. Between these, trapezoidal triangular are often used because the computation is simplified the results are easier interpreted implemented. 43
2 The relationship between interval-valued fuzzy sets intuitionistic fuzzy sets is well known (see [10]. In the present paper we give a bijection between the set of trapezoidal intuitionistic fuzzy numbers a subset of interval-valued trapezoidal fuzzy numbers a bijection between the set of triangular intuitionistic fuzzy numbers a subset of interval-valued triangular fuzzy numbers. These bijections have good properties with respect to arithmetic operations parameters associated with trapezoidal/triangular intuitionistic fuzzy numbers interval-valued trapezoidal/triangular fuzzy numbers. The immediate benefit is that many problems with trapezoidal/triangular intuitionistic fuzzy numbers data can be solved by using an already elaborated method for interval-valued trapezoidal/triangular fuzzy case. We illustrate the theoretical development by an application related with a multicriteria decision making problem inspired from [3]. 2 Trapezoidal triangular intuitionistic fuzzy numbers In this section we recall some basic notions on trapezoidal triangular intuitionistic fuzzy numbers. Definition 1. A trapezoidal fuzzy number (T F N A = (a 1, a 2, a 3, a 4 is a fuzzy set on R with the membership function given by x a 1 a 2 a 1, if x [a 1, a 2 1, if x [a 2, a 3 ] µ A (x = a 4 x a 4 a 3, if x (a 3, a 4 ] 0, otherwise, where a 1 a 2 a 3 a 4. If a 2 = a 3 in the above definition then A is called a triangular fuzzy number ( F N. We denote by (a 1, a 2, a 3 a F N. We denote by T F N (R F N (R the sets of all T F Ns all F Ns, respectively. We recall (see [1, 2] that an intuitionistic fuzzy set in X is an object A given by A = { x, µ A (x, ν A (x ; x X}, where µ A : X [0, 1] ν A : X [0, 1] satisfy the condition 0 µ A (x + ν A (x 1, for every x X. The trapezoidal intuitionistic fuzzy numbers are important to quantify an ill-known information can be easily employed in applications (see e.g. [8, 9, 13, 14]. Definition 2. (see e.g. [13] A trapezoidal intuitionistic fuzzy number (TIFN Ã = (a 1, a 2, a 3, a 4, (a 1, a 2, a 3, a 4 44
3 is an intuitionistic fuzzy set on R, with the membership function µã the non-membership function νã defined as x a 1 a 2 a 1, if x [a 1, a 2 1, if x [a 2, a 3 ] µã(x = a 4 x a 4 a 3, if x (a 3, a 4 ] 0, otherwise νã(x = a 2 x a 2 a 1, if x [a 1, a 2 0, if x [a 2, a 3 ] x a 3 a 4 a 3, if x (a 3, a 4 ] 1, otherwise where a 1 a 2 a 3 a 4, a 1 a 2 a 3 a 4, a 1 a 1, a 2 a 2, a 3 a 3 a 4 a 4. The conditions imposed on a i, a i, i {1, 2, 3, 4} assure that à is an intuitionistic fuzzy set. If a 2 = a 3 (which implies a 2 = a 3 then the T IF N à is called a triangular intuitionistic fuzzy number ( IF N. We denote by à = (a 1, a 2, a 3, (a 1, a 2, a 3 a IF N. If à is a T IF N then µ à 1 ν Ã, where (1 ν à (x = 1 ν à (x for every x R, are T F Ns. If a i = a i = a, i {1, 2, 3, 4} then à can be identified with the trapezoidal fuzzy number (a, a, a, a, the triangular fuzzy number (a, a, a, or the real number a. The addition the scalar multiplication on intuitionistic fuzzy numbers (see [4] or [5] become in the particular case of trapezoidal intuitionistic fuzzy numbers as follows: à + B = (a 1, a 2, a 3, a 4, (a 1, a 2, a 3, a 4 + (b 1, b 2, b 3, b 4, (b 1, b 2, b 3, b 4 = (a 1 + b 1, a 2 + b 2, a 3 + b 3, a 4 + b 4, (a 1 + b 1, a 2 + b 2, a 3 + b 3, a 4 + b 4, λ à = λ (a 1, a 2, a 3, a 4, (a 1, a 2, a 3, a 4 = (λa 1, λa 2, λa 3, λa 4, (λa 1, λa 2, λa 3, λa 4 if λ R, λ 0 λ à = λ (a 1, a 2, a 3, a 4, (a 1, a 2, a 3, a 4 = (λa 4, λa 3, λa 2, λa 1, (λa 4, λa 3, λa 2, λa 1 if λ R, λ < 0. 3 Interval-valued trapezoidal/triangular fuzzy numbers We recall, an interval-valued fuzzy set C =[ C, C ] is defined as (see e.g. [10, 12] C = {(x, [µ C(x, µ C (x]; x X}, 45
4 where the pair of fuzzy sets µ C, µ C : X [0, 1], called the lower fuzzy set of C the upper fuzzy set of C satisfies C 0 µ C(x µ (x 1, for any x X. C C, that is Definition 3. (see, e.g., [15] An interval-valued trapezoidal fuzzy number (IV T F N à is an interval-valued fuzzy set on R, defined by where à = ( a 1, a 2, a 3, a 4 à à Ã. à = [ Ã, à ], = ( a 1, a 2, a 3, a 4 are trapezoidal fuzzy numbers such that If a 2 = a 3 a 2 = a 3 in the above definition then à is a interval-valued triangular fuzzy number (IV F N. We denote by à = [( ( ] a 1, a 2, a 3, a 1, a 2, a 3 a IV F N. If a i = a i = a then à can be identified with the trapezoidal fuzzy number (a, a, a, a, the triangular fuzzy number (a, a, a, or the real number a. We denote by IV T F N (R the sets of all IVTFNs by IV F N (R the sets of all IFNs, respectively. It is immediate that the conditions a 1 a 1 a 4 a 4 are necessary as à IV T F N (R. The addition the scalar multiplication on interval-valued fuzzy numbers (see e.g. [15] become in the particular case of interval-valued trapezoidal fuzzy numbers as follows: Ã+ B = [ (a 1, a 2, a 3, a 4, (a 1, a 2, a 3, a 4 ] + [ (b 1, b 2, b 3, b 4, (b 1, b 2, b 3, b 4 ] = (a 1 + b 1, a 2 + b 2, a 3 + b 3, a 4 + b 4, (a 1 + b 1, a 2 + b 2, a 3 + b 3, a 4 + b 4, λ à = λ [(a 1, a 2, a 3, a 4, (a 1, a 2, a 3, a 4 ] = [ (λa 1, λa 2, λa 3, λa 4, (λa 1, λa 2, λa 3, λa 4 ] if λ R, λ 0 λ à = λ [(a 1, a 2, a 3, a 4, (a 1, a 2, a 3, a 4 ] = [ (λa 4, λa 3, λa 2, λa 1, (λa 4, λa 3, λa 2, λa 1 ] if λ R, λ < 0. 46
5 4 Relations between trapezoidal (triangular intuitionistic fuzzy numbers interval-valued trapezoidal (triangular fuzzy numbers properties The relationship between interval-valued fuzzy sets intuitionistic fuzzy sets is well-known (see [10]. To prove a similar result in the case of IVTFNs TIFNs, then in the case of IV F Ns IF Ns we consider ( ( IV T F N (R = { Ã = [ a 1, a 2, a 3, a 4, a 1, a 2, a 3, a 4 ] } IV T F N (R : a 2 a 2 a 3 a 3 IV F N (R = ( ( { Ã = [ a 1, a 2, a 3, a 1, a 2, a 3 ] IV F N (R : a 2 = a 2 }. Proposition 4. The mapping Φ : T IF N (R IV T F N (R defined as Φ( (a 1, a 2, a 3, a 4, (a 1, a 2, a 3, a 4 = [ ( ( a 1, a 2, a 3, a 4, a 1, a 2, a 3, a 4 ], where a i = a i, i {1, 2, 3, 4} a i =a i, i {1, 2, 3, 4}, is a bijection. Proof. It is immediate Φ 1 : IV T F N (R T IF N (R is defined as Φ 1 [ ( ( a 1, a 2, a 3, a 4, a 1, a 2, a 3, a 4 ] = (a 1, a 2, a 3, a 4, (a 1, a 2, a 3, a 4, where a i = a i, i {1, 2, 3, 4} a i = a i, i {1, 2, 3, 4}, is the inverse of Φ. As above, we obtain the following result. 47
6 Proposition 5. The mapping Ω : IF N (R IV F N (R defined as Ω( (a 1, a 2, a 3, (a 1, a 2, a 3 = [ ( ( a 1, a 2, a 3, a 1, a 2, a 3 ], where is a bijection. a i = a i, i {1, 2, 3} a i =a i, i {1, 2, 3}, Any parameter (real number or real interval associated with a fuzzy number can be extended in a natural way to an intuitionistic fuzzy number or to an interval-valued fuzzy number (see e.g. [4, 6] then particularized to trapezoidal (triangular intuitionistic fuzzy numbers interval-valued trapezoidal (triangular fuzzy numbers, respectively. For example, the expected value EV introduced for fuzzy numbers in [11] becomes (à EV = 1 ( 4 a i + 4 a i 8 i=1 i=1 for à = (a 1, a 2, a 3, a 4, (a 1, a 2, a 3, a 4 ( à EV = 1 ( 4 8 a i i=1 + 4 a i i=1 for à = [ (a 1, a 2, a 3, a 4, (a 1, a 2, a 3, a 4 ]. It is immediate that (à ( EV (à + B = EV + EV B, ( à ( EV ( à + B = EV + EV B ( EV λ à = λev ( EV λ à = λev (Ã, ( Ã, for every Ã, B T IF N (R, Ã, B IV T F N (R λ R. We choose to discuss in detail the case of the expected value because it is considered (see [7] a very good option in the ranking of fuzzy numbers. We introduce the ranking of trapezoidal (triangular intuitionistic fuzzy numbers à B of interval-valued trapezoidal (triangular fuzzy numbers à B by ( à EV B EV (à EV B à EV B EV ( à EV ( B The following properties are very easy to be proved. 48
7 Theorem 6. (i Φ (à + B ( = Φ (à ( + Φ B, for every Ã, B T IF N (R ; (ii Φ λ à = λ Φ (Ã, for every à T IF N (R λ R; ( (à (iii EV Φ (à = EV, for every à T IF N (R ; (iv à B ( EV Φ (à EV Φ B ; ( (v Ω (à + B = Ω (à + Ω B, for every Ã, B IF N (R ; ( (vi Ω λ à = λ Ω (Ã, for every à IF N (R λ R; ( (à (vii EV Ω (à = EV, for every à IF N (R ; (viii à B ( EV Ω (à EV Ω B. 5 An application to multicriteria decision making methods A stard multicriteria decision making problem assumes the evaluation ( ranking of m alternatives A 1,..., A m, under n criteria C 1,..., C n. et us denote by e ij, i {1,..., m}, j {1,..., n} the performance of alternative A i with respect to criterion C j. The matrix E = (e ij i {1,...,m},j {1,...,n} is called the decision matrix of the problem. In addition, let us consider W = (w j j {1,...,n}, where w j represents the weight of the criterion C j. The solution of the problem is based on E W. If the evaluations (e ij i {1,...,m},j {1,...,n} /or (w j j {1,...,n} are fuzzy numbers then we have a fuzzy multicriteria decision making problem. A method based on the expected value of the result of data aggregation was proposed in [3]. We obtain an intuitionistic fuzzy multicriteria decision making problem or an interval-valued fuzzy multicriteria decision making problem if the input data in E W are intuitionistic fuzzy sets (in fact intuitionistic fuzzy numbers often trapezoidal or triangular intuitionistic fuzzy numbers or interval-valued fuzzy sets (in fact interval-valued fuzzy numbers often intervalvalued trapezoidal or triangular fuzzy numbers. et us assume that an interval-valued trapezoidal fuzzy multicriteria decision making method was already elaborated such that only the addition, scalar multiplication the ranking method based on the expected value described in Section 4 were used for evaluating the alternatives. Based on the results in Theorem 6 it is enough to apply this method for E Φ = ( e Φ ij W i {1,...,m},j {1,...,n} Φ = ( wj Φ, where j {1,...,n} eφ ij = Φ (e ij IV T F N (R, wj Φ = Φ (w j IV T F N (R, if e ij T IF N (R, w j T IF N (R are the input data of the problem. We can proceed similarly in the triangular case: the input data e ij IF N (R, w j IF N (R, i {1,..., m}, j {1,..., n} are transformed into interval-valued triangular fuzzy numbers by application Ω an existing interval-valued triangular fuzzy multicriteria decision making method can be applied to e Ω ij = Ω (e ij IV F N (R, = Ω (w j IV F N (R to obtain an evaluation of alternatives. w Ω j 49
8 Acknowledgments The first author was supported by a grant of the Romanian National Authority for Scientific Research, CNCS-EFISCDI, project number PN-II-ID-PCE References [1] Atanassov, K. T., Intuitionistic fuzzy sets, Fuzzy Sets Systems, Vol. 20, 1986, [2] Atanassov, K. T., Intuitionistic Fuzzy Sets: Theory Applications, Springer Physica Verlag, Heidelberg, [3] Ban, A., O. Ban, Optimization extensions of a fuzzy multicriteria decision making method applications to selection of touristic destinations, Expert Systems with Applications, Vol. 39, 2012, [4] Ban, A., Approximation of intuitionistic fuzzy numbers by trapezoidal fuzzy numbers preserving the expected interval, Advances in Fuzzy Sets, Intuitionistic Fuzzy Sets, Generalized Nets Related Topics. Volume I: Foundations (Atanassov, K., O. Hryniewicz, J. Kacprzyk, M. Krawczak, E. Szmidt, Eds., Academic House Exit, Warszawa, 2008, [5] Ban, A.,. Coroianu, Approximate solutions preserving parameters of intuitionistic fuzy linear systems, Notes on Intuitionistic Fuzzy Sets, Vol. 17, 2011, [6] Ban, A.,. Coroianu, P. Grzegorzewski, Trapezoidal approximation aggregation, Fuzzy Sets Systems, Vol. 177, 2011, [7] Ban, A.,. Coroianu, Simplifying the search for effective ranking of fuzzy numbers, IEEE Transactions on Fuzzy Systems, DOI /TFZZ (to appear. [8] Chen, S. J., S. M. Chen, Fuzzy risk analysis based on similarity measures between intervalvalued fuzzy numbers, Computers Mathematics with Applications, Vol. 55, 2008, [9] Chen, S. M., J. H. Chen, Fuzzy risk analysis based on similarity measures between intervalvalued fuzzy numbers interval-valued fuzzy number arithmetic operators, Expert Systems with Applications, Vol. 36, 2009, [10] Deschrijver, G., E. Kerre, On the relationship between some extensions of fuzzy set theory, Fuzzy Sets Systems, Vol. 133, 2003, [11] Heilpern, S., The expected value of a fuzzy number, Fuzzy Sets Systems, Vol. 47, 1992, [12] Hong, D. H., S. ee, Some algebric properties a distance measure for interval-valued fuzzy numbers, Information Sciences, Vol. 148, 2002,
9 [13] i, D. F., A ratio ranking method of triangular intuitionistic fuzzy numbers its application to MADM problems, Computers Mathematics with Applications, Vol. 60, 2010, [14] Xu, Z., Sh. Shang, W. Qian, W. Shu, A method for fuzzy risk analysis based on the new similarity of trapezoidal fuzzy numbers, Expert Systems with Applications, Vol. 37, 2010, [15] Yao, J. S., F. T. in, Constructing a fuzzy flow-shop sequencing model based on statistical data, International Journal Approximate Reasoning, Vol. 29, 2002,
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