Some weighted geometric operators with SVTrN-numbers and their application to multi-criteria decision making problems
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1 Some weighted geometric operators with SVTrN-numbers and their application to multi-criteria decision maing problems Irfan Deli, Yusuf Şubaş Muallim Rıfat Faculty of Education, 7 Aralı University, Kilis, Turey irfandeli@ilis.edu.tr, ysubas@ilis.edu.tr March 3, 2015 Abstract The single valued triangular neutrosophic number (SVTrN-number is simply an ordinary number whose precise value is somewhat uncertain from a philosophical point of view, which is a generalization of triangular fuzzy numbers and triangular intuitionistic fuzzy numbers. Also, SVTrN-number may express more abundant and flexible information as compared with the triangular fuzzy numbers and triangular intuitionistic fuzzy numbers. This article introduces an approach to handle multi-criteria decision maing (MCDM problems under the SVTrN-numbers. Therefore, we first proposed some new geometric operator is called SVTrN weighted geometric operator, SVTrN ordered weighted geometric operator, SVTrN ordered hybrid weighted geometric operator. Also we studied some desirable properties of the geometric operators. And then, an approach based on the SVTrN ordered hybrid weighted geometric operator is developed to solve multi-criteria decision maing problems with SVTrN-number. Finally, a numerical example is used to demonstrate how to apply the proposed approach. Keyword 0.1 Neutrosophic set, single valued neutrosophic numbers, triangular neutrosophic numbers, geometric operators, decision maing. 1 Introduction Zadeh [44] proposed the notation of fuzzy set X on a fixed set E characterized by a membership function denoted by µ X such that µ X : E [0, 1] which are the powerful tools to deal with imperfect and imprecise information. Then, by adding non-membership function to fuzzy sets, Atanassov [1] presented the notation of intuitionistic fuzzy set K on a fixed set E characterized by a membership function µ K : E [0, 1] and a non-membership function γ K : E [0, 1] such that such that 0 µ K (x + γ K (x 1 for any x E, which is a generalization of fuzzy set [44]. By Smarandache [24], intuitionistic fuzzy set was extended to develop the notation of neutrosophic set A on a fixed set E characterized by a truth-membership function T A, a indeterminacy-membership function I A and a falsity-membership function F A such that T A (x, I A (x, F A (x ] 0, 1[ + which is a generalization of fuzzy set and intuitionistic fuzzy set. The neutrosophic sets may express more abundant and flexible information as compared with the fuzzy sets and intuitionistic fuzzy sets. Recently, neutrosophic sets have been researched by many scholars in different fields. For example on neutrosophic similarity clustering [4, 6, 7, 39, 40, 43], on multi-criteria decision maing problems [3, 41] etc. Also the notations such as fuzzy sets, intuitionistic fuzzy sets and neutrosophic sets has been applied to some different fields in [3, 5,, 9, 11, 12, 13, 1, 25, 2, 36, 42]. Aggregation operators, which is an important research topic in decision-maing theory, have been researched by many scholars such as intuitionistic fuzzy sets [14, 19, 21, 26], intuitionistic fuzzy numbers [14, 15, 17, 22, 27, 29, 30, 31, 32, 33, 35], neutrosophic sets [2, 20, 23], neutrosophic number [41], and so on. Especially, Xu and Yager [26], introduced some new geometric aggregation operators, is called intuitionistic fuzzy weighted geometric operator, intuitionistic fuzzy ordered weighted geometric operator, and intuitionistic fuzzy hybrid geometric operator. Also, Wu and Cao [32] presented some geometric aggregation operators with intuitionistic trapezoidal fuzzy numbers. 1
2 Since neutrosophic numbers [10] are a special case of neutrosophic sets, the neutrosophic numbers are importance for neutrosophic multi criteria decision maing (MCDM problems. As a generalization of fuzzy numbers and intuitionistic fuzzy number, a neutrosophic number seems to suitably describe an ill-nown quantity. To the our nowledge, existing approaches are not suitable for dealing with MCDM problems under SVTrN-numbers. Therefore, the remainder of this paper is organized as follows: In section 2, some basic definitions of fuzzy sets, intuitionistic fuzzy sets, neutrosophic sets, single valued neutrosophic sets and single valued triangular neutrosophic number are briefly reviewed. In section 3, some new geometric operator is called SVTrN weighted geometric operator, SVTrN ordered weighted geometric operator, SVTrN ordered hybrid weighted geometric operator are defined(adapted from [41, 14]. In section 4, an approach based on the SVTrN ordered hybrid weighted geometric operator is developed to solve multi-criteria decision maing problems with single valued triangular neutrosophic number is developed. In section 5, a numerical example is given to demonstrate how to apply the proposed approach. In section 7, the study is concluded. 2 Preliminary In this section, we recall some basic notions of fuzzy sets [44], intuitionistic fuzzy sets [1], intuitionistic fuzzy numbers [14] and neutrosophic sets [24]. For more details, the reader could refer to [1, 14, 24, 25, 44]. From now on we use I n = {1, 2,..., n} and I m = {1, 2,..., m} as an index set for n N and m N, respectively. Definition 2.1 [44] Let E be a universe. Then a fuzzy set X over E is a function defined as follows: X = {(µ X (x/x : x E} where µ X : E [0.1]. Here, µ X called membership function of X, and the value µ X (x is called the grade of membership of x E. The value represents the degree of x belonging to the fuzzy set X. Definition 2.2 [1] Let E be a universe. An intuitionistic fuzzy set K on E can be defined as follows: K = {< x, µ K (x, γ K (x >: x E} where, µ K : E [0, 1] and γ K : E [0, 1] such that 0 µ K (x + γ K (x 1 for any x E. Here, µ K (x and γ K (x is the degree of membership and degree of non-membership of the element x, respectively. Definition 2.3 [24] Let E be a universe. A neutrosophic sets(ns A in E is characterized by a truthmembership function T A, a indeterminacy-membership function I A and a falsity-membership function F A. T A (x I A (x and F A (x are real standard elements of [0, 1]. It can be written as A = {< x, (T A (x, I A (x, F A (x >: x E, T A (x, I A (x, F A (x ] 0, 1[ + }. There is no restriction on the sum of T A (x I A (x and F A (x, so 0 T A (x + I A (x + F A (x 3 +. Definition 2.4 [2] Let E be a universe. A single valued neutrosophic sets(svns A,which can be used in real scientific and engineering applications, in E is characterized by a truth-membership function T A, a indeterminacy-membership function I A and a falsity-membership function F A. T A (x I A (x and F A (x are real standard elements of [0, 1]. It can be written as A = {< x, (T A (x, I A (x, F A (x >: x E, T A (x, I A (x, F A (x [0, 1]}. There is no restriction on the sum of T A (x I A (x and F A (x, so 0 T A (x + I A (x + F A (x 3. 2
3 Definition 2.5 [10] Let wã, uã, yã [0, 1] and a 1, b 1, c 1 R such that a 1 b 1 c 1. Then, a single valued triangular neutrosophic number (SVTrN-number ã = a 1, b 1, c 1 wã, uã, yã is a special neutrosophic set on the real number set R, whose truth-membership indeterminacy-membership and falsity-membership functions are defined as follows: (x a 1 wã/(b 1 a 1 (a 1 x < b 1 wã (x = b µã(x = 1 (c 1 xwã/(c 1 b 1 (b 1 < x c 1 0 otherwise and respectively. (b 1 x + uã(x a 1 /(b 1 a 1 (a 1 x < b 1 uã (x = b νã(x = 1 (x b 1 + uã(c 1 x/(c 1 b 1 (b 1 < x c 1 1 otherwise, (b 1 x + yã(x a 1 /(b 1 a 1 (a 1 x < b 1 yã (x = b λã(x = 1 (x b 1 + yã(c 1 x/(c 1 b 1 (b 1 < x c 1 1 otherwise, If a 1 0 and at least c 1 > 0 then ã = a 1, b 1, c 1 wã, uã, yã is called a positive SVTrN-numbers, denoted by ã > 0. Liewise, if c 1 0 and at least a 1 < 0, then ã = a 1, b 1, c 1 wã, uã, yã is called a negative SVTrN-numbers, denoted by ã < 0. A SVTrN-numbers ã = a 1, b 1, c 1 wã, uã, yã may express an ill-nown quantity about a, which is approximately equal to a. Note that the set of all SVTrN-numbers on R will be denoted by. Definition 2.6 [10] Let ã = a 1, b 1, c 1 wã, uã, yã, b = a 2, b 2, c 2 w b, u b, y b and γ 0 be any real number. Then, 1. ã + b = a 1 + a 2, b 1 + b 2, c 1 + c 2 wã w b, yã y b 2. ã b = a 1 c 2, b 1 b 2, c 1 a 2 wã w b, y b y b a 1 a 2, b 1 b 2, c 1 c 2 wã w b, yã y b (c 1 > 0, c 2 > 0 3. ã b = a 1 c 2, b 1 b 2, c 1 a 2 wã w b, yã y b (c 1 < 0, c 2 > 0 c 1 c 2, b 1 b 2, a 1 a 2 wã w b, yã y b (c 1 < 0, c 2 < 0 a 1 /c 2, b 1 /b 2, c 1 /a 2 wã w b, yã y b (c 1 > 0, c 2 > 0 4. ã/ b = c 1 /c 2, b 1 /b 2, a 1 /a 2 wã w b, yã y b (c 1 < 0, c 2 > 0 c 1 /a 2, b 1 /b 2, a 1 /c 2 wã w b, yã y b (c 1 < 0, c 2 < 0 { γa1, γb 5. γã = 1, γc 1 wã, uã, yã (γ > 0 γc 1, γb 1, γa 1 wã, uã, yã (γ < 0 { a γ 6. ã γ = 1, bγ 1, cγ 1 w ã, uã, yã (γ > 0 c γ 1, bγ 1, aγ 1 w ã, uã, yã (γ < 0 Liewise, it is easily proven that the results obtained by multiplication and division of two SVTrNnumbers are not always SVTrN-numbers. However, we often use SVTrN-numbers to express these computational results approximately. Example 2.7 Let ã = 4, 5, 6 0.7, 0.5, 0.3 and b = 2, 3, 4 0.6, 0.1, 0.4 be two SVTrN-numbers then, 3
4 1. ã + b = 6,, , 0.5, ã b = 0, 2, 4 0.6, 0.5, ã b =, 15, , 0.5, ã/ b = 1, 5 3, 3 0.6, 0.5, ã =, 10, , 0.5, b 2 = 4, 9, , 0.1, 0.4 Definition 2. [10] We defined a method to compare any two SVTrN-numbers which is based on the score function and the accuracy function. Let ã = a, b, c wã, uã, yã, then S(ã = 1 [a + b + c] (2 + µ ã νã γã (1 and A(ã = 1 [a + b + c] (2 + µ ã νã + γã is called the score and accuracy degrees of ã, respectively. Definition 2.9 [10] Let ã 1, ã 2. Then, 1. If S(ã 1 < S(ã 2, then ã 1 is smaller than ã 2, denoted by ã 1 < ã 2 2. If S(ã 1 > S(ã 2, then ã 1 is bigger than ã 2, denoted by ã 1 > ã 2 3. If S(ã 1 = S(ã 2 (a If A(ã 1 < A(ã 2, then ã 1 is smaller than ã 2, denoted by ã 1 < ã 2 (b If A(ã 1 > A(ã 2, then ã 1 is bigger than ã 2, denoted by ã 1 > ã 2 (c If A(ã 1 = A(ã 2, then ã 1 and ã 2 are the same, denoted by ã 1 = ã 2 3 Geometric operators of the SVTrN-number In this section, three SVTrN weighted geometric operator of SVTrN-numbers is called SVTrN weighted geometric operator, SVTrN ordered weighted geometric operator, SVTrN ordered hybrid weighted geometric operator is given. Some of it is quoted from application in [10, 14, 15, 16, 17, 1, 26, 31, 32, 37]. Definition 3.1 Let ã j = a b c j wã uã yãj (j I n. Then SVTrN weighted geometric operator, denoted by G go, is defined as G go : n, G go (ã 1, ã 2,..., ã n = where, w = (w 1, w 2,..., w n T is a weight vector associated with the G go operator, for every j I n such that, w j [0, 1] and n w j = 1. n i=1 ã wi i Theorem 3.2 Let ã j = a b c j wã uã yãj Γ (j I, w = (w 1, w 2,..., w n T be a weight vector of ã for every j I n such that w j [0, 1] and n w j = 1. Then, their aggregated value by using G go operator is also a SVTrN-number and n G go (ã 1, ã 2,..., ã n = a w j n b w j n c w j j n wã n uã n yãj 4
5 Proof The proof can be made by using mathematical induction on n as Assume that, and be two SVTrN-numbers then, for n = 2, we have If holds for n =, that is 2 G ogo (ã 1, ã 2 = ã 1 = a 1, b 1, c 1 wã1, uã1, yã1 ã 2 = a 2, b 2, c 2 wã2, uã2, yã2 a w j G ogo (ã 1, ã 2,..., ã = 2 a w j b w j 2 b w j c w j j c w j j 2 wã then, when n = + 1, by the operational laws in Definition 2.6, I have G ogo (ã 1, ã 2,..., ã, ã +1 = a w j b w j c w j j 2 wã uã wã 2 uã w +1 a +1, w +1 b +1, w +1 c +1 wã+1, uã+1, yã+1 yãj uã yãj yãj therefore proof is valid. = a wj +1 b wj c wj j wã +1 uã yãj Definition 3.3 Let ã j = a b c j wã uã yãj (j I n. Then SVTrN ordered weighted geometric operator denoted by G ogo, is defined as G ogo : n, G ogo (ã 1, ã 2,..., ã n = where w = (w 1, w 2,..., w n T is a weight vector associated with the mapping G ogo, which satisfies the normalized conditions: w [0, 1] and n w = 1 b = a, b, c wã, uã, yã is the -th largest of the n SVTrN-numbers ã j (j I n which is determined through using raning method in Definition 2.. n bw It is not difficult to follows from Definition 3.3 that G ogo (ã 1, ã 2,..., ã n which is summarized as in Theorem 3.4. = n b w = n ( a, b, c wã, uã, yã w = n aw, bw, cw w ã, uã, yã = n aw, n bw, n cw n w ã, n u ã, n y ã Theorem 3.4 Let ã j = a b c j wã uã yãj (j I. Then SVTrN ordered weighted geometric operator denoted by G ogo, is defined as n G ogo : n, G ogo (ã 1, ã 2,..., ã n = n a w, n b w, c w n wã, n uã, n yã (2 where w [0, 1], n w = 1 b = a, b, c wã, uã, yã is the -th largest of the n neutrosophic sets ã j (j I n which is determined through using some raning method in Definition 2.. 5
6 Proof The proof can be made by using mathematical induction on n as for n = 2, we have 2 G ogo (ã 1, ã 2 = a wj 2 b wj 2 c wj j 2 wã 2 uã 2 yãj If holds for n =, that is G ogo (ã 1, ã 2,..., ã = a wj w j b wj c wj j wã uã yãj then, when n = + 1, by the operational laws in Definition 2.6, I have G ogo (ã 1, ã 2,..., ã, ã +1 = awj bwj cwj j w ã j, u ã j, y ã j a w +1 wã+1, uã+1, yã+1 therefore proof is valid. = +1, bw +1 +1, cw awj +1 bwj +1 cwj j Now, we give an example (is adapted from [14]. +1 w ã j, +1 u ã j, +1 y ã j Example 3.5 There are four experts who are invited to evaluate some enterprise. Their evaluations are expressed with the single valued neutrosophic sets ã 1 = 0.123, 0.234, , 0.5, 0.7, ã 2 = 0.234, 0.354, , 0.6, 0.6, ã 3 = 0.125, 0.365, , 0.7, 0.5, ã 4 = 0.215, 0.345, , 0., 0.4, respectively. To eliminate effect of individual bias on comprehensive evaluation, the unduly high evaluation and the unduly low evaluation are punished through giving a smaller weight. Assume that the position weight vector is w = (0.15, 0.35, 0.35, Compute the comprehensive evaluation of the four experts on the enterprise though using the neutrosophic ordered weighted averaging operator. Solving According to Eq. (3.2, the scores of the neutrosophic sets ã j (j = 1, 2, 3, 4 are obtained as follows: S(ã 1 = 1 [ ] = ( , S(ã 2 = 1 [ ] = ( , S(ã 3 = 1 [ ] = ( , S(ã 4 = 1 [ ] = ( , respectively. It is obvious that S(ã 2 > S(ã 3 > S(ã 4 > S(ã 1. Hence according to the above scoring function raning method, its follows that ã 2 > ã 3 > ã 4 > ã 1. Hence, we have: b1 = ã 2 = 0.234, 0.354, , 0.6, 0.6, b2 = ã 3 = 0.125, 0.365, , 0.7, 0.5, b3 = ã 4 = 0.215, 0.345, , 0., 0.4, 6
7 b4 = ã 1 = 0.123, 0.234, , 0.5, 0.7, Using Eq. (2, we obtain: G ogo (ã 1, ã 2, ã 3, ã 4 = , , , 0., 0.7 = (0.166, 0.333, , 0., 0.7 Definition 3.6 Let ã j = a b c j wã uã yãj (j I. Then SVTrN ordered hybrid weighted geometric operator denoted by G hgo, is defined as G hgo : n, G ogo (ã 1, ã 2,..., ã n = where w = (w 1, w 2,..., w n T. w j [0, 1] and n w j = 1 is a weight vector associated with the mapping G hgo, a j a weight with nω(j I n is denoted by Ãj i.e., à j = nωã here n is regarded as a balance factor ω = (ω 1, ω 2,..., ω n T is a weight vector of the a j (j I n ˆb is the -th largest of the n SVTrNnumbers Ãj (j I n which are determined through using some raning method such as the above scoring function raning method. n ˆbw Note that if ω = (1/n, 1/n,..., 1/n T, then G hgo degenerates to the G ogo. Example 3.7 ã 1, ã 2, ã 3. Their evaluations are expressed with the G go. ã 1 = (0.123, 0.234, , 0.5, 0.7, ã 2 = (0.234, 0.354, , 0.6, 0.6, ã 3 = (0.125, 0.365, , 0.7, 0.5, ã 4 = (0.215, 0.345, , 0., 0.4 respectively. Assume that the weight vector of the three experts is ω = (0.2, 0.3, 0.3, 0.2 T and the position weight vector is w = (0.4, 0.1, 0.1, 0.4 T. Compute the comprehensive evaluation of the three experts on the decision alternative through using the G hgo. Solving à 1 = ã 1 = (0.123, 0.234, , 0.5, 0.7 = (0.09, 0.17, , 0.5, 0.7 à 2 = ã 2 = (0.234, 0.354, , 0.6, 0.6 = (0.21, 0.425, , 0.6, 0.6 à 3 = ã 3 = (0.125, 0.365, , 0.7, 0.5 = (0.150, 0.43, , 0.7, 0.5 à 4 = ã 4 = (0.215, 0.345, , 0., 0.4 = (0.172, 0.276, , 0., 0.4 we obtain the scores of the SVTrN-numbers Ãj (j = 1, 2, 3 as follows: S(Ã1 = 1 [ ] ( = 0.02, S(Ã2 = 1 [ ] ( = 0.171, S(Ã3 = 1 [ ] ( = 0.143, S(Ã4 = 1 [ ] ( =
8 Obviously, S(Ã2 > S(Ã3 > S(Ã1 > S(Ã4. Thereby, according to the above scoring function raning method, we have ˆb1 = Ã2 = (0.21, 0.425, , 0.6, 0.6 It follows from (3.2 that ˆb2 = Ã3 = (0.150, 0.43, , 0.7, 0.5 ˆb3 = Ã4 = (0.172, 0.276, , 0., 0.4 ˆb4 = Ã1 = (0.09, 0.17, , 0.5, 0.7 G hgo (ã 1, ã 2, ã 3, ã 4 = , , , 0., 0.7 = 0.14, 0.316, , 0., 0.7 Theorem 3. Let ã j = a b c j wã uã yãj (j I n, w = (w 1, w 2,..., w n T be a weight vector of ã j with w j [0, 1] and n w j = 1. Then their aggregated value by using G hgo operator is also a SVTrNnumber and n G hgo : n, G hgo (ã 1, ã 2,..., ã n = n a w, n b w, c w where ˆb = a, b, c wã, uã, yã is the -th largest of the n SVTrN-numbers Âj = nω j ã j (j I n which is determined through using some raning method such as the above scoring function raning method. n wã, n uã, n yã (3 Proof Theorem 3. can be proven in a similar way to that of Theorem 3.4 (omitted. 4 Multi-criteria decision maing based on SVTrN-numbers In this section, we define a multi-criteria decision maing method, so called SVTrN-multi-criteria decisionmaing method, by using the G hgo operator. Some of it is quoted from application in [10, 14, 17, 1, 37]. There is a panel with four possible alternatives to invest the money (adapted from [1]: (1 x 1 is a car company (2 x 2 is a food company (3 x 3 is a computer company (4 x 4 is a television company. The investment company must tae a decision according to the following three criteria: (1 u 1 is the ris analysis (2 u 2 is the growth analysis (3 u 3 is the environmental impact analysis (4 u 4 social political impact analysis. The four possible alternatives are to be evaluated under the above three criteria by corresponding to linguistic values of SVTrN-numbers for linguistic terms (adapted from [37], as shown in Table 1. Linguistic terms Linguistic values of SVTrN-numbers Absolutely low 0.1, 0.2, , 0.2, 0.3 Low 0.2, 0.3, , 0.3, 0.4 Fairly low 0.3, 0.4, , 0.4, 0.5 Medium 0.4, 0.5, , 0.5, 0.6 Fairly high 0.5, 0.6, , 0.6, 0.7 High 0.6, 0.7, , 0.7, 0. Absolutely high 0.7, 0., , 0., 0.9 Table 1: SVTrN-numbers for linguistic terms
9 Definition 4.1 Let X = (x 1, x 2,..., x m be a set of alternatives, U = (u 1, u 2,..., u n be the set of attributes. If ã ij = a i b i c ij w i u i y ij, then [ã ij ] m n = u 1 u 2 u n x 1 ã 11 ã 12 ã 1n x 2 ã 21 ã 22 ã 2n x m ã m1 ã m2 ã mn is called an SVTrN-multi-criteria decision-maing matrix of the decision maer. Now, we can give an algorithm of the SVTrN-multi-criteria decision-maing method as follows Algorithm: Step 1. Construct the decision-maing matrix [ã ij ] m n for decision Step 2. Compute the SVTrN-numbers Ãij = nω i ã ij (i I m j I n and write the decision-maing matrix [Ãij] m n Step 3. Obtain the scores of the SVTrN-numbers Ãij (i I m j I n Step 4. Ran all SVTrN-numbers Ãij(i I m j I n by using the raning method of SVTrN-numbers and determine the SVTrN-numbers [b i ] 1 n = b i (i I m I n where b i is -th largest of Ãij for j I n Step 5. Give the decision matrix [b i ] 1 n for i = 1, 2, 3, 4 Step 6. Compute G hgo ( b i1, b i2,..., b in for i I m Step 7. Ran all alternatives x i alternative. by using the raning method of SVTrN-numbers and determine the best 5 Application In this section, we give an application for the SVTrN-multi-criteria decision-maing method, by using the G hgo operator. Some of it is quoted from application in [10, 14, 1, 37]. Example 5.1 Let us consider the decision-maing problem adapted from [41]. There is an investment company, which wants to invest a sum of money in the best option. There is a panel with the set of the four alternatives is denoted by X = {x 1 = car company, x 2 =food company, x 3 =computer company, x 4 =television company} to invest the money. The investment company must tae a decision according to the set of the four attributes is denoted by U = {u 1 =ris analysis, u 2 =growth analysis, u 3 =environmental impact analysis, u 4 = social political impact analysis}. Then, the weight vector of the attributes is ω = (0.1, 0.2, 0.3, 0.4 T and the position weight vector is w = (0.24, 0.26, 0.26, 0.24 T by using the weight determination based on the normal distribution. For the evaluation of an alternative x i (i = 1, 2, 3, 4 with respect to a criterion u j (j = 1, 2, 3, 4, it is obtained from the questionnaire of a domain expert. Then, Step 1. The decision maer construct the decision matrix [ã ij ] 4x4 as follows: u 1 u 2 u 3 u 4 x 1 (0.1, 0.2, , 0.2, 0.3 (0.3, 0.4, , 0.4, 0.5 (0.6, 0.7, , 0.7, 0. (0.1, 0.3, , 0.3, 0.9 x 2 (0.3, 0.6, , 0.6, 0.9 (0.1, 0.6, , 0.6, 0.9 (0.4, 0.5, , 0.5, 0.6 (0.1, 0.6, , 0.6, 0.9 x 3 (0.2, 0.3, , 0.3, 0.4 (0.5, 0.6, , 0.6, 0.7 (0.7, 0., , 0., 0.9 (0.2, 0.4, , 0.4, 0. x 4 (0.6, 0.7, , 0.7, 0. (0.2, 0.3, , 0.3, 0. (0.2, 0.7, , 0.7, 0. (0.2, 0.7, , 0.7, 0. 9
10 Step 2. Compute Ãij = nω i ã ij (i = 1, 2, 3, 4 j = 1, 2, 3, 4 as follows: à 11 = ã 11 = ( , , , 0.2, 0.3 = 0.39, 0.525, , 0.2, 0.3 Liewise, we can obtain other SVTrN-numbers Ãij = nω i ã ij (i = 1, 2, 3, 4 j = 1, 2, 3, 4 which are given by the SVTrN-decision matrix [Ãij] 4 4 as follows: [Ãij] 4 4 = u 1 u 2 u 3 u 4 x 1 (0.39, 0.525, , 0.2, 0.3 (0.32, 0.40, , 0.4, 0.5 (0.542, 0.652, , 0.7, 0. (0.025, 0.146, , 0.3, 0.9 x 2 (0.61, 0.15, , 0.6, 0.9 (0.15, 0.665, , 0.6, 0.9 (0.333, 0.435, , 0.5, 0.6 (0.025, 0.442, , 0.6, 0.9 x 3 (0.525, 0.61, , 0.3, 0.4 (0.574, 0.665, , 0.6, 0.7 (0.652, 0.765, , 0., 0.9 (0.076, 0.231, , 0.4, 0. x 4 (0.15, 0.67, , 0.7, 0. (0.276, 0.32, , 0.3, 0. (0.145, 0.652, , 0.7, 0. (0.076, 0.565, , 0.7, 0. Step 3. We can obtain the scores of the SVTrN-numbers Ãij of the alternatives x j (j = 1, 2, 3, 4 on the four attributes u i (i = 1, 2, 3, 4 as follows: S(Ã11 = 0.30 S(Ã12 = S(Ã13 = S(Ã14 = S(Ã21 = S(Ã22 = S(Ã23 = S(Ã24 = 0.09 S(Ã31 = S(Ã32 = S(Ã33 = S(Ã34 = S(Ã41 = S(Ã42 = S(Ã43 = 0.27 S(Ã44 = Step 4. The raning order of all SVTrN-numbers Ãij(i = 1, 2, 3, 4 j = 1, 2, 3, 4 as follows à 11 > Ã13 > Ã12 > Ã14 à 21 > Ã23 > Ã22 > Ã24 à 31 > Ã32 > Ã33 > Ã34 Thus, we have: à 41 > Ã43 > Ã42 > Ã44 b11 = Ã11, b 12 = Ã13, b 13 = Ã12, b 14 = Ã14 b21 = Ã21, b 22 = Ã23, b 23 = Ã22, b 24 = Ã24 b31 = Ã31, b 32 = Ã32, b 33 = Ã33, b 34 = Ã34 b41 = Ã41, b 42 = Ã43, b 43 = Ã42, b 44 = Ã44 Step 5. The decision matrix [b i ] 1 n for i = 1, 2, 3, 4 are given by b 1 = (0.39, 0.525, , 0.2, 0.3, (0.542, 0.652, , 0.7, 0., (0.32, 0.40, , 0.4, 0.5, (0.025, 0.146, , 0.3, 0.9 b 2 = (0.61, 0.15, , 0.6, 0.9, (0.333, 0.435, , 0.5, 0.6, (0.15, 0.665, , 0.6, 0.9, (0.025, 0.442, , 0.6, 0.9 b 3 = (0.525, 0.61, , 0.3, 0.4, (0.574, 0.665, , 0.6, 0.7, (0.652, 0.765, , 0., 0.9, (0.076, 0.231, , 0.4, 0. b 4 = (0.15, 0.67, , 0.7, 0., (0.145, 0.652, , 0.7, 0., (0.276, 0.32, , 0.3, 0., (0.076, 0.565, , 0.7, 0. Step 6. We can calculate the SVTrN-numbers G hgo (b i = G hgo ( b i1, b i2, b i3, b i4 for i = 1, 2, 3, 4 as follows: G hgo (b 1 = G hgo ( b 11, b 12, b 13, b 14 = , , , 0.7, 0.9 = 0.570, 0.693, , 0.7,
11 G hgo (b 2 = G hgo ( b 11, b 12, b 13, b 14 = , , , 0.7, 0. = 0.312, 0.53, , 0.7, 0. G hgo (b 3 = G hgo ( b 11, b 12, b 13, b 14 = , , , 0., 0.9 = 0.365, 0.612, , 0., 0.9 G hgo (b 4 = G hgo ( b 11, b 12, b 13, b 14 = , , , 0.7, 0.9 = 0.044, 0.303, , 0.7, 0.9 Step 7. The scores of G hgo ( b i for i = 1, 2, 3, 4 can be obtained as follows: S(G hgo (b 1 = 0.12 S(G hgo (b 2 = S(G hgo (b 3 = S(G hgo (b 4 = It is obvious that G hgo (b 1 > G hgo (b 2 > G hgo (b 3 > G hgo (b 4 Therefore, the raning order of the alternatives x j (j = 1, 2, 3, 4 is generated as follows: x 1 x 2 x 3 x 4 The best supplier for the enterprise is x 1. 6 Conclusion This paper proposes three geometric operator is called SVTrN weighted geometric operator, SVTrN ordered weighted geometric operator, SVTrN ordered hybrid weighted geometric operator. Then, a approach is developed to solve multi-criteria decision maing problems. It is easily seen that the proposed approach can be extended to solve more general multi-criteria decision maing problems in a straightforward manner. Due to the fact that a SVTrN-number is a generalization of a triangular fuzzy number and triangular intuitionistic fuzzy number, the other existing approaches of triangular fuzzy number and triangular intuitionistic fuzzy number may be extended to SVTrN-numbers. Therefore, 1. More effective approaches for SVTrN-numbers, 2. How to determine the weight vectors for SVTrN-numbers, 3. An approach of multi-criteria decision-maing with weights expressed by single valued neutrosophic sets, will be investigated in the near future. 11
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