Intuitionistic Linguistic Weighted Bonferroni Mean Operator and Its Application to Multiple Attribute Decision Making

Liu, Peide; Rong, Lili; Chu, Yanchang; Li, Yanwei

doi:https://doi.org/10.1155/2014/545049

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Research Article | Open Access

Volume 2014 | Article ID 545049 | https://doi.org/10.1155/2014/545049

Intuitionistic Linguistic Weighted Bonferroni Mean Operator and Its Application to Multiple Attribute Decision Making

Peide Liu,^1,2Lili Rong,³Yanchang Chu,¹and Yanwei Li¹

Academic Editor: Ching-Ter Chang

Received01 Mar 2014

Revised25 Apr 2014

Accepted16 May 2014

Published19 Jun 2014

Abstract

The intuitionistic linguistic variables are easier to describe the fuzzy information which widely exists in the real world, and Bonferroni mean can capture the interrelationship of the individual arguments. However, the traditional Bonferroni mean can only process the crisp number. In this paper, we will extend Bonferroni mean to the intuitionistic linguistic environment and propose a multiple attribute decision making method with intuitionistic linguistic information based on the extended Bonferroni mean which can consider the interrelationship of the attributes. Firstly, score function and accuracy function of intuitionistic linguistic numbers are introduced. Then, an intuitionistic linguistic Bonferroni mean (ILBM) operator and an intuitionistic linguistic weighted Bonferroni mean (ILWBM) operator are developed, and some desirable characteristics of them are studied. At the same time, some special cases with respect to the parameters and in Bonferroni are analyzed. Based on the ILWBM operator, the approach to multiple attribute decision making with intuitionistic linguistic information is proposed. Finally, an illustrative example is given to verify the developed approach and to demonstrate its effectiveness.

1. Introduction

Since the object things are fuzzy and uncertain, the attributes involved in the multiple attribute decision making (MADM) problems are not always expressed as crisp numbers, and some of them are more suitable to be denoted by fuzzy numbers, such as interval number, linguistic variable, and intuitionistic fuzzy number. Atanassov [1, 2] proposed the intuitionistic fuzzy set (IFS) characterized by a membership function and a nonmembership function, which is a generalization of the concept of fuzzy set proposed by Zadeh [3]. Later, Atanassov and Gargov [4] and Atanassov [5] further introduced the interval-valued intuitionistic fuzzy set (IVIFS), and Xu [6] and Wang [7] proposed the decision-making methods based on IVIFS. Zhang and Liu [8] defined the triangular intuitionistic fuzzy number, and they proposed the relevant decision making methods separately. Wang [9] gave the definition of intuitionistic trapezoidal fuzzy number and interval intuitionistic trapezoidal fuzzy number; then, some decision making methods based on the intuitionistic triangular fuzzy number had been proposed [10]. On the other hand, because linguistic variables are easy to express the qualitative information in evaluating the attributes, the decision making methods based on the linguistic variables have been a rapid development and a wide range of applications [11–14]. Furthermore, Wang and Li [15] proposed intuitionistic linguistic sets which combine intuitionistic fuzzy sets and linguistic variables, intuitionistic linguistic numbers, intuitionistic two-semantics, and the Hamming distance between two intuitionistic two-semantics and rank the alternatives by calculating the comprehensive membership degree to the ideal solution for each alternative. Obviously, intuitionistic linguistic sets are better to express the fuzzy information by integrating the advantages of intuitionistic fuzzy sets and linguistic variables, and they are receiving wide concerns. Liu [16] developed an intuitionistic linguistic generalized dependent ordered weighted average (ILGDOWA) operator and an intuitionistic linguistic generalized dependent hybrid weighted aggregation (ILGDHWA) operator. Liu and Wang [17] proposed an intuitionistic linguistic power generalized weighted average (ILPGWA) operator and an intuitionistic linguistic power generalized ordered weighted average (ILPGOWA) operator. On the basis of intuitionistic linguistic variables, Liu and Jin [18] further proposed the concept of intuitionistic uncertain linguistic variables (IULVs) and defined the operations on them, further developing some geometric average operators based on IULVs. Liu et al. [19] proposed the intuitionistic uncertain linguistic arithmetic Heronian mean (IULAHM) operator, intuitionistic uncertain linguistic weighted arithmetic Heronian mean (IULWAHM) operator, intuitionistic uncertain linguistic geometric Heronian mean (IULGHM) operator, and intuitionistic uncertain linguistic weighted geometric Heronian mean (IULWGHM) operator. Liu [20] proposed the concept of interval valued intuitionistic uncertain linguistic variables (IVIULVs) and defined the operations on them, further developing some geometric average operators based on IVIULVs. Obviously, now there are no researches on intuitionistic linguistic variables being applied to Bonferroni mean.

The information aggregation operators are an interesting and important research topic, which are receiving increasing concerns [16–28]. Bonferroni [22] originally proposed a Bonferroni mean (BM) operator, which has a desirable characteristic; that is, it can capture the expressed interrelationship of the individual arguments. Recently, Yager [23] further studied the BM and proposed an OWA variation of Bonferroni means, weighted Bonferroni aggregation, and Bonferroni choquet aggregation operator, and these generalizations enhance their modeling capability. Later, Beliakov et al. [24] proposed the generalized Bonferroni mean and discussed several interesting special cases with quite an intuitive interpretation for application. Xu and Yager [25] investigated the BM under intuitionistic fuzzy environments and developed an intuitionistic fuzzy BM (IFBM) and discussed its variety of special cases. Furthermore, they applied the weighted IFBM to multicriteria decision making and gave some numerical examples to illustrate related results. Beliakov and James [26] proposed the extending generalized Bonferroni means to Atanassov orthopairs in decision making contexts. Wei et al. [27] proposed the uncertain linguistic weighted Bonferroni mean operator (ULWBM) and the uncertain linguistic weighted geometric Bonferroni mean operator (ULWGBM). Liu and Jin [28] proposed some extended Bonferroni mean operators for trapezoid fuzzy linguistic variables, including a trapezoid fuzzy linguistic weighted Bonferroni mean operator (TFLWBM) and a trapezoid fuzzy linguistic weighted Bonferroni OWA operator (TFLWBOWA). Obviously, Bonferroni mean had been extended to intuitionistic fuzzy sets, uncertain linguistic variables, and trapezoid fuzzy linguistic variables. However, now Bonferroni mean has not been extended to intuitionistic linguistic variables.

The intuitionistic linguistic variables are very suitable to be used for depicting uncertain or fuzzy information, and Bonferroni mean can capture the interrelationship of the individual arguments. Motivated by the idea of IFBM operator proposed by Xu and Yager [25], this paper is to propose some Bonferroni operators, such as an intuitionistic linguistic Bonferroni mean (ILBM) operator and an intuitionistic linguistic weighted Bonferroni mean (ILWBM) operator, and some desirable properties of these operators are studied. At the same time, some special cases in these operators are analyzed. Based on the ILWBM operator, the approach to multiple attribute decision making with intuitionistic linguistic information is proposed.

The remainder of this paper is organized as follows. In Section 1, we give an introduction of the research background. Section 2 briefly reviews some basic concepts and operations related to the intuitionistic linguistic variables and BM. In Section 3, an intuitionistic linguistic BM (ILBM) and an intuitionistic linguistic weighted BM (ILWBM) are developed, and some special cases are discussed. Section 4 introduces a procedure for multiple attribute decision making based on ILWBM operator. Section 5 gives an example to illustrate the decision making steps based on the proposed method and to analyze the affect on the decision-making results of the different parameters. Section 6 ends this paper with some concluding remarks.

2. Preliminaries

2.1. The Linguistic Set and Its Extension

Suppose that is a finite and totally ordered discrete term set, where is the odd value. In real situation, is equal to 3, 5, 7, 9, and so forth. For example, when , a set could be given as follows: = {extremely poor, very poor, poor, slightly poor, fair, slightly good, good, very good, extremely good}.

Usually, for any linguistic set , it is required that and must satisfy the following additional characteristics [11, 12].(1)The set is ordered: , if and only if .(2)There is the negation operator: .(3)Maximum operator: , if .(4)Minimum operator: , if .

Furthermore, in order to preserve all the given information, Herrera et al. [11] proposed that the discrete linguistic label is extended to a continuous linguistic label which satisfied the above characteristics.

For any linguistic variables , the operations are defined as follows [13, 14]:

2.2. The Intuitionistic Linguistic Set (ILS)

Definition 1 (see [15]). An ILS in is defined as where , , and , with the condition , for all . The numbers and represent, respectively, the membership degree and nonmembership degree of the element to linguistic index .

For each ILS in , if , for all , then is called a hesitancy degree of to linguistic index . It is obvious that , for all .

Definition 2 (see [15]). Let be ILS; the ternary group is called an intuitionistic linguistic number, and can also be viewed as a collection of the intuitionistic linguistic number (ILN). So, it can also be expressed as . In addition, represents the hesitancy degree, and it can also be called the intuitionistic linguistic fuzzy degree. For convenience, an ILN is denoted by , where , .

Let and be two ILNs and ; then, the operations of ILNs are defined as follows [15]:

Definition 3 (see [16]). Let be an ILN; a score function of an ILN can be represented as follows:

Definition 4 (see [16]). Let be an ILN; an accuracy function of an ILN can be represented as follows:

Definition 5 (see [16]). If and are any two ILNs, then(1)if , then ;(2)if , then if , then ; if , then .

2.3. Bonferroni Mean (BM)

The BM was originally proposed by Bonferroni in [22], which was defined as follows.

Definition 6 (see [22]). Let , and let be a collection of nonnegative numbers. If then is called the Bonferroni mean (BM).

Obviously, the BM has the following properties.(1).(2), if , for all .(3); that is, is monotonic, if , for all .(4).If and , then (9) reduces to the following: If , (9) reduces to the following: which is a generalized mean operator; particularly the following cases hold.(1)If and , then (11) reduces to the usual average (2)If and , then (11) reduces to the geometric mean operator

3. The Intuitionistic Linguistic Weighted Bonferroni Mean Operators

The Bonferroni mean (BM) has a significant advantage of capturing the interrelationship of the individual arguments; however, the traditional BM can only process the crisp numbers and cannot deal with intuitionistic linguistic. In this section, we will extend BM to deal with intuitionistic linguistic information and develop an intuitionistic linguistic Bonferroni mean (ILBM) operator and an intuitionistic linguistic weighted Bonferroni mean (ILWBM) operator. Further, we will discuss some desirable characteristics of them and some special cases with respect to the parameters and in Bonferroni.

Definition 7. Let be a collection of ILNs, and ; if where is the set of all intuitionistic linguistic numbers and for any , then is called the intuitionistic linguistic Bonferroni mean (ILB).

According to the operations of ILNs, we can get the following result.

Theorem 8. Let , and let be a collection of ILNs. Then, the aggregated result by formula (14) is also an ILN, and

We use mathematical induction to prove this theorem shown as follows.

Proof. (1) Firstly, we need to prove that By the operations of ILNs defined in (3)–(6), we have
(a) When , by formulas (18) and (3), we can get that is, when , formula (16) is right.
(b) Suppose that when , formula (16) is right; that is, then, when , we have
Firstly, we prove that
We also use the mathematical induction on as follows.
(i) When , we have
(ii) Suppose that , then formula (22) is right; that is,
Then, when , we have that is, for , formula (22) is also right.
(iii) So, for all , formula (22) is right.
Similarly, we can prove that So, by formulas (20), (22), and (26), formula (21) can be transformed as So, when , formula (16) is also right.
Thus, formula (16) is right, for all .
(2) Then, we can prove that formula (15) is right.
By formula (16), we can get

Example 9. Suppose that there are three intuitionistic linguistic numbers , , and , and suppose that and ; then, we can calculate the shown as follows: where Replace the data of , , and ; we can get

In the following, we will discuss some special cases of the operator shown as follows.

(1) When , formula (15) reduces to an intuitionistic linguistic generalized mean operator; it follows that

(2) If and , then (15) reduces to an intuitionistic linguistic average operator

(3) If and , then (15) reduces to an intuitionistic linguistic geometric mean operator

The traditional BM has the properties of commutativity, idempotency, monotonicity, and boundedness; in the following, we will prove that ILB also has these properties.

Theorem 10 (commutativity). Let be any permutation of ; then,

Proof. Let Since is any permutation of , we have thus,

Theorem 11 (idempotency). Let , ; then .

Proof. Since , for all , we have

Theorem 12 (monotonicity). Let and be two collections of IFNs. If , for all , then

Proof. Since for all , we have
So, that is, .

Theorem 13 (boundedness). The operator lies between the and operators:

Proof. Let and .
Since , then That is, that is, .
In operator, we only consider the input parameters and their interrelationships and do not consider the importance of each input parameter itself. However, in many practical situations, the weight of input data is also an important parameter. So, we can define an intuitionistic linguistic weighted Bonferroni mean (ILWBM) operator.

Definition 14. Let be a collection of ILNs, and , if where is the set of all intuitionistic linguistic numbers and is the weight vector of , , . ; is a balance parameter. Then, ILWB is called the intuitionistic linguistic weighted Bonferroni mean (ILWBM) operator.

Theorem 15. ILB operator is a special case of the ILWB operator.

Proof. If , then :

Theorem 16. Let and be a collection of ILNs, and is the weight vector of , , . Then, the aggregated result by formula (46) is also an ILN, and Similar to Theorem 8, it can be proved by using mathematical induction on .

Example 17. Suppose that there are three intuitionistic linguistic numbers , , and , and the weight vector (suppose and ); then, we can calculate the shown as follows: where
Replace the data of , , and ; we can get then,
It is easy to prove that the operator hasthe properties of commutativity and monotonicity, but it has not the property of idempotency.

4. An Approach to Multiple Attribute Decision Making Based on the Intuitionistic Linguistic Numbers

In the previous section, we extended BM to intuitionistic linguistic information and proposed ILBM and ILWBM operators. In this part, we will apply these extended BM operators to solve the multiple attribute decision making problems with intuitionistic linguistic information and give the detail decision making steps. The advantage of the proposed method is that it can consider the interrelationship of the attributes.

Consider a multiple attribute decision making with intuitionistic linguistic information: let be a discrete set of alternatives, and let be the set of attributes; is the weighting vector of the attribute , where , . Suppose that is the decision matrix, where takes the form of the intuitionistic linguistic number, and , , , . Then, the ranking of alternatives is required.

In the following, we apply operator to multiple attribute decision making based on intuitionistic linguistic information.

The methods involve the following steps.

Step 1 (normalization). Generally, there are two attribute types in multiple attribute decision making: they are benefit type (the bigger the performance values the better) and cost type (the smaller the performance values the better); we need normalization in order to transform the performance values of the cost type into the performance values of the benefit type. Then, will be transformed into the matrix , where (1), for benefit type of ;(2), for cost type of .

Step 2. Calculate the comprehensive evaluation values of each alternative by operator:

Step 3. Rank the intuitionistic linguistic number by Definition 5.

Step 4. Rank all the alternatives in accordance with in descending order, and then select the most desirable alternative with the largest overall performance value.

Step 5. End.

5. Example

Let us suppose an investment company, which wants to invest a sum of money in the best option. There is a panel with four possible alternatives in which to invest the money:(1) is a car company;(2) is a computer company;(3) is a TV company;(4) is a food company.

The investment company must make a decision according to the following four attributes (suppose that the weight vector of four attributes is ):(1) is the risk analysis;(2) is the growth analysis;(3) is the social-political impact analysis;(4) is the environmental impact analysis.

The four possible alternatives are evaluated using the linguistic term set under the above four attributes, and the decision matrix is listed in Table 1.

5.1. Decision Steps

To get the best alternative(s), the following steps are involved.

Step 1 (normalization). Because all the attributes , , , are the benefit type, the decision making matrix does not need normalization.

Step 2. Calculate the comprehensive evaluation values of each alternative by operator (here let ).

From formula (53), we can get

Step 3. Rank the intuitionistic linguistic number by Definition 5:

Step 4. Rank all the alternatives in accordance with in descending order; we can get

5.2. Discussions

5.2.1. About the Influence of the Parameters on Decision Making Result

In order to illustrate the influence of the parameters on decision making result of this example, we use the different values of in Step 2 to rank the alternatives. The ranking results are shown in Table 2.

As we can see from Table 2, the ordering of the alternatives may be different for the different value in operator. In general, we can take the values of the two parameters as , which is not only intuitive and simple but also considering the interrelationship of the attributes. In the special case where at least one of these two parameters takes the value of zero, the operator cannot capture the interrelationship of the individual arguments. Thus, the organization can properly select the desirable alternative according to his interest and the actual needs.

5.2.2. About the Validity of This Method

In order to verify the validity of this method, we use the method proposed by Wang and Li [15], which is the first method to process the multiple attribute decision making problems with intuitionistic linguistic information; to rank this example, we can get the ranking as . Obviously, these two methods have the same ranking result when or , .

5.2.3. Comparing with the Existing Methods

There are many decision making methods to process the multiple attribute decision making problems in which the attribute value is crisp number. However, there are a few methods which can process the intuitionistic linguistic information.

The first method which can process intuitionistic linguistic information was proposed by Wang and Li [15], and it is based on the arithmetic weighted average operator of intuitionistic linguistic information. This method can be only a special case of when , proposed in this paper. Obviously, the method in [15] cannot consider the interrelationship of the attributes. However, the proposed method in this paper can provide a generalized method with parameters and and can capture the interrelationship of the attributes.

Comparing with the methods proposed by Liu [16] and Liu and Wang [17], which can consider the relationships between the attributes and can process the intuitionistic linguistic information, however, these methods process the relationships between the attributes by adding a class of weighted vector; for example, in [16], the added weighted vector can be obtained by calculating the similarity of each attribute to mean value and in [17] the weighted vector is determined by the support degree between the attributes. Obviously, these methods consider the relationships between the attributes in an indirect way. However, the method proposed in this paper can directly calculate the relationship between attribute values, so we can call it interrelationship.

Based on above discussions, the proposed method has a significant advantage which can consider the interrelationship between two attribute values. Of course, there exist some shortcomings in the proposed method; for example, it only considered the interrelationship between two attributes and not for three attributes or more. In addition, this method is more complex in calculation than the other methods.

6. Conclusion

Bonferroni mean has a significant advantage which can capture the interrelationship of the individual arguments. However, the traditional Bonferroni mean can only process the crisp number. In this paper, we extended Bonferroni mean to the intuitionistic linguistic environment and proposed an intuitionistic linguistic Bonferroni mean (ILBM) operator and an intuitionistic linguistic weighted Bonferroni mean (ILWBM) operator. Furthermore, we discussed some desirable properties of these operators and analyzed their special cases. Based on the ILWBM operator, we proposed a multiple attribute decision making method with intuitionistic linguistic information which can not only consider the importance of each attribute but also reflect the interrelationship between the attributes. However, there exist some shortcomings in the proposed method; for example, it only considered the interrelationship between two attributes and not for three attributes or more. In addition, it is more complex in calculation than the other methods. In the future, we will extend ILWBM operator to process the interrelationship among three attributes, and not for three attributes, or extend BM operator to process the other fuzzy information. In addition, we will research the applications of the proposed operators to solve the real decision making problems.

Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.

Acknowledgments

This paper is supported by the National Natural Science Foundation of China (no. 71271124), the Humanities and Social Sciences Research Project of Ministry of Education of China (no. 13YJC630104 and no. 09YJA630088), the Natural Science Foundation of Shandong Province (no. ZR2011FM036), Shandong Provincial Social Science Planning Project (no. 13BGLJ10), and Graduate education innovation projects in Shandong Province (no. SDYY12065). The authors also would like to express their appreciation to the anonymous reviewers and Editors for their very helpful comments that improved the paper.

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Copyright © 2014 Peide Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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