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Prioritized Aggregation Operators of GTHFNs MADM Approach for the Evaluation of Renewable Energy Sources

Article type: Research Article

Authors: Uluçay, Vakkas1 | Deli, Irfan1 | Edalatpanah, Seyyed Ahmad2; ∗

Affiliations: [1] Department of Mathematics, Kilis 7 Aralık University, Turkey | [2] Department of Applied Mathematics, Ayandegan Institute of Higher Education, Iran

Correspondence: [∗] Corresponding author.

Keywords: hesitant fuzzy set, generalized trapezoidal hesitant fuzzy numbers, prioritized aggregation operator, multiple attribute decision making, renewable energy sources

DOI: 10.15388/24-INFOR570

Journal: Informatica, vol. 35, no. 4, pp. 859-882, 2024

Received January 2024
|
Accepted September 2024
|
Published: 2024
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Abstract

In this paper, firstly, we propose two new GTHFNs-prioritized aggregation operators called generalized trapezoidal hesitant fuzzy number prioritized weighted average operator and generalized trapezoidal hesitant fuzzy number prioritized weighted geometric operator. Secondly, we investigate the fundamental properties of the operators in detail such as idempotency, boundedness and monotonicity. Thirdly, we propose a method based on the developed GTHF-numbers prioritized aggregation operators for solving an MADM problem with GTHF-numbers. Fourthly, we give a numerical example of the developed method. Finally, a comparative analysis is given with some existing methods in solving an MADM problem with GTHF-numbers.

1Introduction

Nowadays, as the society continues developing, practical problems and actual scenarios of both human nature and real-world situations, as well as uncertainty, vagueness, inconsistency and imprecision, seem to be prevalent. Therefore, fuzzy set theory (Zadeh, 1965) has been utilized in various fields with imprecise information. Although the fuzzy set theory is a useful tool for modelling problems, including uncertainty information, it can be too difficult in some cases. To avoid this difficulty, recently, intuitionistic fuzzy sets (Atanassov, 1986), type-2 fuzzy sets (Mizumoto and Tanaka, 1976), type-n fuzzy sets (Rickard et al., 2008) and extensions of fuzzy sets, which express information in different ways, have been defined and researched widely. Also, as a generalization of fuzzy sets, Torra and Narukawa (2009) and Torra (2010) introduced the concept of hesitant fuzzy sets which allows the membership of an element of a set to be represented by several possible values. The relationships among hesitant fuzzy sets were also discussed. Many studies on hesitant fuzzy sets have been conducted: Xu and Xia (2011a) and Li et al. (2015) developed some distance measures for hesitant fuzzy sets under similarity measures, Xu and Xia (2011b) introduced some distance and correlation measures on hesitant fuzzy sets, including desired properties in detail, Wei (2012) developed a few prioritized aggregation operators for hesitant fuzzy sets, and then applied decision making problems in which the attributes are in a different priority level and so on. Since these studies still cannot provide all original data information for the decision making problems, Deli and Karaaslan (2021) introduced the generalized trapezoidal hesitant fuzzy numbers on R. As a consequence, a large number of studies have been conducted by the following authors: Ali et al. (2023), Atanassov (2000), Yager (2008), Xia and Xu (2011), Deli (2021, 2020), Anusha et al. (2023), Liao et al. (2014), Wei (2012).

As the classical sets, fuzzy sets and the generalization of the collected information for the values of the alternatives based on criteria of aggregation operators are useful to convert the whole data into a single value. Therefore, the aggregation operators have great importance and significance in solving MADM problems in the whole set theory. For example, Wan (2013) developed a new decision method based on power average operators of fuzzy numbers. Aydemir and Yilmaz Gündüz (2020) defined some operational laws of q-rung orthopair fuzzy sets and then proposed Dombi prioritized weighted aggregation operators. Zhao and Wei (2013) proposed the intuitionistic fuzzy Einstein hybrid averaging operator and intuitionistic fuzzy Einstein hybrid geometric operator. Verma and Sharma (2014) introduced the trapezoid fuzzy linguistic prioritized weighted average operators and developed an approach to multiple attribute group decision-making trapezoid fuzzy linguistic information. Liu et al. (2016) developed the intuitionistic trapezoidal fuzzy prioritized ordered weighted aggregation operator, then proposed the prioritized multi-criteria decision-making problems under intuitionistic trapezoidal fuzzy information. Jiang (2018) developed some models for interval intuitionistic trapezoidal fuzzy multiple attribute decision making problems in which the attributes are in different priority level and with some prioritized aggregation operators. Fahmi et al. (2019, 2021) defined some new operation laws for trapezoidal cubic hesitant fuzzy numbers and then developed some new aggregation operators. Liang et al. (2017) proposed some new prioritized aggregation operator, and then some desired properties of the new aggregation operators were studied. Liu et al. (2017) proposed two prioritized aggregation operators for hesitant intuitionistic fuzzy linguistic sets, and then, based on these aggregation operators, an approach for multi-attribute decision-making was developed under the hesitant intuitionistic fuzzy linguistic sets. Verma (2017) combined the idea of generalized mean and prioritized weighted average operators. Recently, some authors introduced several prioritized aggregation operators within different mathematical structures (Akram et al., 2020; Garg and Rani, 2023; Jana et al., 2020; Kumar and Chen, 2022; Liu and Gao, 2020; Wang et al., 2022).

1.1Novelty

Some methods have been using generalized trapezoidal hesitant fuzzy (GTHF) numbers such as proposed by Deli and Karaaslan (2021). However, each of these methods can work well in a specific situation when the attributes have the same priority, but can also generate undesirable decision-making results when the attributes have the same priority. Therefore, inspired by the ideal of prioritized aggregation operators (Yager, 2008), we developed an approach to solve a multi-attribute decision-making (MADM) problems with GTHF-numbers in which the attributes are in a different priority level.

1.2Motivation and Contribution

The motivation and contributions of the study are as follows:

  • 1. Prioritized operators of GTHF-numbers are introduced to propose a new method for solving MADM problems with GTHF-numbers in which the attributes are in a different priority level.

  • 2. The main aim is to develop GTHF-numbers-prioritized weighted average operator and GTHF-prioritized weighted geometric operator for MADM problems with GTHF-numbers.

  • 3. A method is constructed with an algorithm for MADM problems with GTHF-numbers.

  • 4. An example for application is presented to demonstrate the effectiveness and advantage of the proposed method.

1.3Paper

Structure

The remainder of the paper is organized as follows:

  • • ↓ In Section 2, we give a brief introduction on some basic definitions and propositions.

  • • ↓ In Section 3, we introduce some GTHF-numbers prioritized operators and discuss their desirable properties.

  • • ↓ In Section 4, we develop an MADM method and then initiate an example in which the attributes are in a different priority level.

  • • ↓ In Section 5, we give a comparison with some existing methods.

  • • ↪ In Section 6, we propose a conclusion.

2Preliminaries

In the following, we briefly describe some basic concepts and basic operational laws related to hesitant fuzzy sets and generalized hesitant trapezoidal fuzzy numbers.

Definition 1

Definition 1(Zadeh, 1965).

Let X be a universe. Then, a fuzzy set is defined as follows:

(1)
A={μA(x)/x:x∈X},
where μA:X→[0,1] such that 0⩽μA(x)⩽1 for all x∈X.

Definition 2

Definition 2(Wang, 2009).

Let ηa˜∈[0,1] and a,b,c,d∈R such that a⩽b⩽c⩽d. Then, a trapezoidal fuzzy number (TF-number) a˜=⟨(a,b,c,d);ηa˜⟩ is a special fuzzy set on the real number set R, whose membership function is defined as

μa˜(x)=(x−a)ηa˜/(b−a),a⩽x⩽b,ηa˜,b⩽x⩽c,(d−x)ηa˜/(d−c),c⩽x⩽d,0,otherwise.

Definition 3

Definition 3(Wang et al., 2006).

Let a˜=⟨(a,b,c,d);ηa˜⟩ be a TF-number with it’s membership function μa˜(x). Centroid point of a˜, denoted by a˜∗, is computed as:

a˜∗=∫x.μa˜(x)dx∫μa˜(x)dx=ηa˜(d2−2c2+2b2−a2+dc−ab)+3(c2−b2)3ηa˜(d−c+b−a)+6(c−b).

Definition 4

Definition 4(Torra, 2010).

Let X be a universe. Then, a hesitant fuzzy set (HFS), denoted by H, is defined as:

(2)
H={⟨x,ξ(x))⟩:x∈X},
where ξ(x) is a set of some values in [0,1] and ξ=ξ(x) is called a hesitant fuzzy element (HFE).

Definition 5

Definition 5(Yager, 2008).

Let G={Gj:j∈{1,2,…,n}} be a set of attributes and let a prioritization between the attribute expressed by the linear order G1≻G2≻G3≻⋯≻Gn indicate that attribute Gj has a higher priority than Gk, if j<k. The value Gj(x) is the performance of any alternative x under attribute Gj, and satisfies Gj(x)∈[0,1]. Then PA(G1(x),G2(x),…,Gn(x)), called the prioritized average operator, is defined as:

PA(G1(x),G2(x),…,Gn(x))=∑j=1nwjGj(x),
where wj=Tj∑i=1nTi, Ti=∏i=1i−1Gi(x), Tj=∏j=1j−1Gj(x)such thatT1=1.

Definition 6

Definition 6(Wei, 2012).

Let ξj (j∈{1,2,…,n}) be a collection of HFEs. Then,

  • 1. The hesitant fuzzy prioritized weighted average operator of the set ξj (j∈{1,2,…,n}) is defined as:

    (3)
    HFPWAO(ξ1,ξ2,…,ξn)=⨁j=1n(Tj∑i=1nTiξj)=⋃h11∈ξ1,h12∈ξ2,…,h1n∈ξn{1−∏j=1n(1−h1j)Tj∑i=1nTi},
    where Ti=∏k=1i−1∑h1k∈ξkh1k, Tj=∏k=1j−1∑h1k∈ξkh1k (i,j=2,…,n), T1=1.

  • 2. The hesitant fuzzy prioritized weighted geometric operator of the set ξj (j∈{1,2,…,n}) is defined as:

    (4)
    HFPWGO(ξ1,ξ2,…,ξn)=⨂j=1n(ξj)Tj∑i=1nTi=⋃h11∈ξ1,h12∈ξ2,…,h1n∈ξn{∏j=1n(ξn)Tj∑j=1nTj},
    where Ti=∏k=1i−1∑h1k∈ξkh1k, Tj=∏k=1j−1∑h1k∈ξkh1k (i,j=2,…,n), T1=1.

Theorem 1

Theorem 1(Wei, 2012).

Let ξj and ξ´j (j∈{1,2,…,n}) be two sets of HFEs.

  • 1. If all ξj (j=1,2,…,n) are equal, i.e. ξj=ξ for all j∈{1,2,…,n} then,

    (5)
    HFPWGO(ξ1,ξ2,…,ξn)=HFPWAO(ξ1,ξ2,…,ξn)=ξ.

  • 2. Let ξ−=minj∈{1,2,…,n}{ξj}, ξ+=maxj∈{1,2,…,n}{ξj} then

    (6)
    ξ−⩽HFPWAO(ξ1,ξ2,…,ξn),HFPWGO(ξ1,ξ2,…,ξn)⩽ξ+.

  • 3. If ξi⩽ξ´j for all j∈{1,2,…,n}, then

    (7)
    HFPWA(ξ1,ξ2,…,ξn)⩽HFPWA(ξ´1,ξ´2,…,ξ´n),
    (8)
    HFPWA(ξ1,ξ2,…,ξn)⩽HFPWA(ξ´1,ξ´2,…,ξ´n).

Definition 7

Definition 7(Deli and Karaaslan, 2021).

Let R be a set of real numbers such that a⩽b⩽c⩽d. Then, a generalized hesitant trapezoidal fuzzy number (GTHF-number), denoted by ℏ, is defined as:

ℏ=⟨(a,b,c,d);ξ={hi:hi∈[0,1]}⟩
(hi is set of some values in [0,1], i∈{1,2,…,n}) which is a special hesitant fuzzy set on the real number set R, whose membership functions are defined as
μi(x)=(x−a)hi/(b−a),a⩽x<b,hi,b⩽x⩽c,(d−x)hi/(d−c),c<x⩽d,0,otherwise.

In the paper, for purposes of focusing on GTHF- numbers, note that the set of all GTHF-numbers on R+ will be denoted by Θ.

Definition 8

Definition 8(Deli and Karaaslan, 2021).

Let ℏ=⟨(a,b,c,d);ξ⟩, ℏ1=⟨(a1,b1,c1,d1);ξ1⟩, ℏ2=⟨(a2,b2,c2,d2);ξ2⟩∈Θ and γ≠0 be any real number. Then,

  • 1. ℏ1⊕ℏ2=⟨(a1+a2,b1+b2,c1+c2,d1+d2);⋃h11∈ξ1,h12∈ξ2{ξ11+h12−h11.h12}⟩;

  • 2. ℏ1⊙ℏ2=⟨(a1a2,b1b2,c1c2,d1d2);⋃h11∈ξ1,h12∈ξ2{h11.h12}⟩;

  • 3. γℏ=⟨(γa,γb,γc,γd);⋃h∈ξ{1−(1−h)γ}⟩(γ⩾0);

  • 4. (ℏ)γ=⟨(aγ,bγ,cγ,dγ);⋃h∈ξ{hγ}⟩(γ⩾0).

Definition 9.

Deli and Karaaslan (2021) Let ℏj=⟨(aj,bj,cj,dj);ξj⟩, j∈In be a set of GTHF-numbers. Then,

  • 1. The hesitant fuzzy weighted geometric operator of the set ℏj (j∈{1,2,…,n}) is defined as:

    HwG(ℏ1,ℏ2,…,ℏn)=⨂j=1nℏjwj=⟨(∏j=1najwj,∏j=1nbjwj,∏j=1ncjwj,∏j=1ndjwj);⋃h11∈ξ1,h12∈ξ2,…,h1n∈ξn{∏j=1nh1jwj}⟩;

  • 2. The hesitant fuzzy weighted average operator of collection ℏj (j∈{1,2,…,n}) is defined as:

    HwA(ℏ1,ℏ2,…,ℏn)=⨁j=1nwj.ℏj=⟨(∑j=1nwj.aj,∑j=1nwj.bj,∑j=1nwj.cj,∑j=1nwj.dj);⋃h11∈ξ1,h12∈ξ2,…,h1n∈ξn{1−∏j=1n(1−h1j)wj}⟩,

where w=(w1,w2,…,wn)T is the weight vector of ℏj,j∈In such that wj∈[0,1] and ∑j=1nwj=1.

3GTHFN-Prioritized Aggregation Operators

In this section, we developed GTHFN-prioritized average operator and GTHF-prioritized geometric operator and examined some desired properties such as idempotency, boundedness and monotonicity in detail.

Definition 10.

Let ℏj=⟨(aj,bj,cj,dj);ξj⟩ (j=1,2,…,n) be a set of GTHF-numbers on [0,1]⊆R, G={Gj:j∈{1,2,…,n}} be a set of attributes such that there is a prioritization as in the Definition 5. Then, the GTHFN-prioritized average operator, denoted by ϜA(ℏ1,ℏ2,…,ℏn), is defined by

(9)
ϜA(ℏ1,ℏ2,…,ℏn)=⨁j=1n(Tj∑i=1nTiℏj),
where
T1=1,Tj=∏k=1j−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(j=2,…,n)
and
T1=1,Ti=∏k=1i−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(i=2,…,n).

Theorem 2.

Let ℏj=⟨(aj,bj,cj,dj);ξj⟩ (j=1,2,…,n) be a set of GTHF-numbers on [0,1]⊆R, G={Gj:j∈{1,2,…,n}} be a set of attributes such that there is a prioritization as in the Definition 5. Then, their aggregated value by using the ϜA(ℏ1,ℏ2,…,ℏn) operator is also a GTHF-number, and

(10)
ϜA(ℏ1,ℏ2,…,ℏn)=⨁j=1n(Tjℏj∑i=1nTi)=⟨(∑j=1nTj∑i=1nTiaj,∑j=1nTj∑i=1nTibj,∑j=1nTj∑i=1nTicj,∑j=1nTj∑i=1nTidj);⋃h11∈ξ1,h12∈ξ2,…,h1n∈ξn{1−∏j=1n(1−h1j)Tj∑i=1nTi}⟩,
where
T1=1,Tj=∏k=1j−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(j=2,…,n)
and
T1=1,Ti=∏k=1i−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(i=2,…,n).

It can be easily proved that the ϜA operator has the following properties.

Theorem 3

Theorem 3(Idempotency).

Let ℏj=⟨(aj,bj,cj,dj);ξj⟩ (j=1,2,…,n) be a set of GTHF-numbers on [0,1]⊆R, G={Gj:j∈{1,2,…,n}} be a set of attributes such that there is a prioritization as in the Definition 5. If ℏj=ℏ(ℏ=⟨(a,b,c,d);ξj⟩(j=1,2,…,n)) for all j∈{1,2,…,n}, then

(11)
ϜA(ℏ1,ℏ2,…,ℏn)=ℏ,
where
T1=1,Tj=∏k=1j−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(j=2,…,n)
and
T1=1,Ti=∏k=1i−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(i=2,…,n).

Proof.

For ℏj=ℏ for all j∈{1,2,…,n}, and by definition of ϜA operator, we have

(12)
ϜA(ℏ1,ℏ2,…,ℏn)=⨁j=1n(Tjℏj∑i=1nTi)=⟨(∑j=1nTj∑i=1nTiaj,∑j=1nTj∑i=1nTibj,∑j=1nTj∑i=1nTicj,∑j=1nTj∑i=1nTidj);⋃h11∈ξ1,h12∈ξ2,…,h1n∈ξn{1−∏j=1n(1−h1j)Tj∑i=1nTi}⟩=⟨(∑j=1nTj∑i=1nTia,∑j=1nTj∑i=1nTib,∑j=1nTj∑i=1nTic,∑j=1nTj∑i=1nTid);⋃h11∈ξ1,h12∈ξ2,…,h1n∈ξn{1−∏j=1n(1−h1j)Tj∑i=1nTi}⟩,(∑j=1nTj∑i=1nTi=1)=⟨(a,b,c,d);ξj⟩(j=1,2,…,n)}⟩=ℏ,
where
T1=1,Tj=∏k=1j−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(j=2,…,n)
and
T1=1,Ti=∏k=1i−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(i=2,…,n).
This completes the proof.  □

Theorem 4

Theorem 4(Boundedness).

Let ℏj=⟨(aj,bj,cj,dj);ξj⟩ (j=1,2,…,n) be a set of GTHF-numbers on [0,1]⊆R, G={Gj:j∈{1,2,…,n}} be a set of attributes such that there is a prioritization as in the Definition 5. Let

ℏ−=⟨(minj∈{1,2,…,n}{aj},minj∈{1,2,…,n}{bj},minj∈{1,2,…,n}{cj},minj∈{1,2,…,n}{dj});minj∈{1,2,…,n}{minh1j∈ξj{h1j}}⟩
and
ℏ+=⟨(maxj∈{1,2,…,n}{aj},maxj∈{1,2,…,n}{bj},maxj∈{1,2,…,n}{cj},maxj∈{1,2,…,n}{dj});maxj∈{1,2,…,n}{maxh1j∈ξj{h1j}}⟩.
If
(13)
“aj⩽ai,bj⩽bi,cj⩽ci,dj⩽diandh1j⩽h1ifor allh1j∈ξj,h1i∈ξi”⇒“ℏj=⟨(aj,bj,cj,dj);ξj⟩⩽ℏi=⟨(ai,bi,ci,di);ξi⟩”
then
(14)
ℏ−⩽ℏj⩽ℏ+.

Proof.

We have ∑j=1nTj∑i=1nTi=1, since

minj∈{1,2,…,n}{aj}⩽{aj}⩽maxj∈{1,2,…,n}{aj},minj∈{1,2,…,n}{bj}⩽{bj}⩽maxj∈{1,2,…,n}{bj},minj∈{1,2,…,n}{cj}⩽{cj}⩽maxj∈{1,2,…,n}{cj},minj∈{1,2,…,n}{dj}⩽{dj}⩽maxj∈{1,2,…,n}{dj},
and
minh1j∈ξj{h1j}⩽h1j⩽maxh1j∈ξj{h1j}.
Let ϜA be an operator. Then, by using the Theorem 3.2, it yields that
(15)
ℏ−⩽ℏj⩽ℏ+.
 □

Theorem 5

Theorem 5(Monotonicity).

Let ℏj=⟨(aj,bj,cj,dj);ξj⟩ (j=1,2,…,n) and ℏ´j=⟨(a´j,b´j,c´j,d´j);xi´j⟩ (j=1,2,…,n) be two sets of GTHF-numbers on [0,1]⊆R, G={Gj:j∈{1,2,…,n}} be a set of attributes such that there is a prioritization as in the Definition 5. If ℏj⩽ℏ´j for all j∈{1,2,…,n} based on equation (13), then

(16)
ϜA(ℏ1,ℏ2,…,ℏn)⩽ϜA(ℏ´1,ℏ´2,…,ℏ´n).
where
T1=1,Tj=∏k=1j−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(j=2,…,n),T1=1,Ti=∏k=1i−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(i=2,…,n),T1=1,Tj=∏k=1j−1∑h´1k∈xi´kh´1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h´1k(dk−ck+bk−ak)+6(ck−bk)(j=2,…,n)
and
T1=1,Ti=∏k=1i−1∑h´1k∈xi´kh´1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h´1k(dk−ck+bk−ak)+6(ck−bk)(i=2,…,n).

Definition 11.

Let ℏj=⟨(aj,bj,cj,dj);ξj⟩ (j=1,2,…,n) be a collection of GTHF-numbers on [0,1]⊆R, G={Gj:j∈{1,2,…,n}} be a set of attributes such that there is a prioritization as in the Definition 5. Then, the GTHFN-prioritized geometric operator, denoted by ϜG(ℏ1,ℏ2,…,ℏn), is defined by

(17)
ϜG(ℏ1,ℏ2,…,ℏn)=ℏ1T1∑i=1nTi⊗ℏ2T2∑i=1nTi⊗⋯⊗ℏ1T2∑i=1nTi,
where
T1=1,Tj=∏k=1j−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(j=2,…,n)
and
T1=1,Ti=∏k=1i−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(i=2,…,n).

Theorem 6.

Let ℏj=⟨(aj,bj,cj,dj);ξj⟩ (j=1,2,…,n) be a set of GTHF-numbers on [0,1]⊆R, G={Gj:j∈{1,2,…,n}} be a set of attributes such that there is a prioritization as in the Definition 5. Then, their aggregated value by using the ϜG(ℏ1,ℏ2,…,ℏn) operator is also a GTHF-number, and

(18)
ϜG(ℏ1,ℏ2,…,ℏn)=ℏ1T1∑j=1nTj⨂ℏ2T2∑j=1nTj⨂…⨂ℏnTn∑j=1nTj=⟨(ajTj∑j=1nTj,bjTj∑j=1nTj,cjTj∑j=1nTj,djTj∑j=1nTj);⋃γ1∈ℏ1,γ2∈ℏ2,…,γn∈ℏn{∏j=1n(γj)Tj∑j=1nTj}⟩,
where
T1=1,Tj=∏k=1j−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(j=2,…,n)
and
T1=1,Ti=∏k=1i−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(i=2,…,n).

It can be easily proved that the ϜG operator has the following properties.

Theorem 7

Theorem 7(Idempotency).

Let ℏj=⟨(aj,bj,cj,dj);ξj⟩ (j=1,2,…,n) be a set of GTHF-numbers on [0,1]⊆R, G={Gj:j∈{1,2,…,n}} be a set of attributes such that there is a prioritization as in the Definition 5. If ℏj=ℏ for all j∈{1,2,…,n}, then

(19)
ϜG(ℏ1,ℏ2,…,ℏn)=ℏ
where
T1=1,Tj=∏k=1j−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(j=2,…,n)
and
T1=1,Ti=∏k=1i−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(i=2,…,n).

Theorem 8

Theorem 8(Boundedness).

Let ℏj=⟨(aj,bj,cj,dj);ξj⟩ (j=1,2,…,n) be a set of GTHF-numbers on [0,1]⊆R, G={Gj:j∈{1,2,…,n}} be a set of attributes such that there is a prioritization as in the Definition 5. Let

ℏ−=⟨(minj∈{1,2,…,n}{aj},minj∈{1,2,…,n}{bj},minj∈{1,2,…,n}{cj},minj∈{1,2,…,n}{dj});minj∈{1,2,…,n}{minh1j∈ξj{h1j}}⟩
and
ℏ+=⟨(maxj∈{1,2,…,n}{aj},maxj∈{1,2,…,n}{bj},maxj∈{1,2,…,n}{cj},maxj∈{1,2,…,n}{dj});maxj∈{1,2,…,n}{maxh1j∈ξj{h1j}}⟩.
If
(20)
“aj⩽ai,bj⩽bi,cj⩽ci,dj⩽diandh1j⩽h1ifor allh1j∈ξj,h1i∈ξi”⇒”ℏj=⟨(aj,bj,cj,dj);ξj⟩⩽ℏi=⟨(ai,bi,ci,di);ξi⟩”
then
(21)
ℏ−⩽ϜG(ℏ1,ℏ2,…,ℏn)⩽ℏ+,
where
T1=1,Tj=∏k=1j−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(j=2,…,n)
and
T1=1,Ti=∏k=1i−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(i=2,…,n).

Theorem 9

Theorem 9(Monotonicity).

Let ℏj=⟨(aj,bj,cj,dj);ξj⟩ (j=1,2,…,n) and ℏ´j=⟨(a´j,b´j,c´j,d´j);xi´j⟩ (j=1,2,…,n) be two sets of GTHF-numbers on [0,1]⊆R, G={Gj:j∈{1,2,…,n}} be a set of attributes such that there is a prioritization as in the Definition 5. If ℏj⩽ℏ´j for all j∈{1,2,…,n} based on equation (20), then

(22)
ϜG(ℏ1,ℏ2,…,ℏn)⩽ϜG(ℏ´1,ℏ´2,…,ℏ´n),
where
T1=1,Tj=∏k=1j−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(j=2,…,n),T1=1,Ti=∏k=1i−1∑h1k∈ξkh1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h1k(dk−ck+bk−ak)+6(ck−bk)(i=2,…,n),T1=1,Tj=∏k=1j−1∑h´1k∈xi´kh´1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h´1k(dk−ck+bk−ak)+6(ck−bk)(j=2,…,n)
and
T1=1,Ti=∏k=1i−1∑h´1k∈xi´kh´1k(dk2−2ck2+2bk2−ak2+dkck−akbk)+3(ck2−bk2)3h´1k(dk−ck+bk−ak)+6(ck−bk)(i=2,…,n).

4An Approach for GTHFPA Operator to MADM

4.1Decision-Making Steps

Fig. 1

Frame diagram for proposed work.

Frame diagram for proposed work.

In this section, we shall utilize the GTHFPA operators to MADM. To do this, we develop an algorithm which is presented in Fig. 1.

Definition 12.

Let U={U1,U2,…,Um} be a set of alternatives, E={E1=⋃r=1k1{e1r}, E2=⋃r=1k2{e1r},…, En=⋃r=1kn{e1r}:k1,k2,…, kn∈Z+} be a set of attributes. Here, there is a prioritization between the attributes expressed by the linear order E1≻E2≻⋯≻En that indicates attribute Ej has a higher priority than Ek, if j<k. Suppose that GTHF sub-decision matrix for sub-attribute set Ej=⋃r=1kj{e1r} be Hj=(xirj)m×kj (i=1,2,…,m, r=1,2,…,kj), where xirj is in the form of GTHF-number based on the alternative Ui and sub-attribute ejr.

Now, we develop an approach for MADM problems under the GTHFPA operator (or GTHFPG operator) with GTHF-numbers as the following algorithm.

Algorithm:

Step 1.

Construct the GTHF sub-decision matrix for sub-attribute set Ej=⋃r=1kj{ejr} as Hj=(xirj)m×kj=(⟨(airj,birj,cirj,dirj);ξirj⟩)m×kj (i=1,2,…,m,r=1,2,…,kj) for decision.

Step 2.

Compute overall values matrix

(23)
Aij=⟨(aij,bij,cij,dij);ξij⟩=GTHFPA(xi1j,xi2j,…,xikjj)=Ti1J∑r=1kjTirJxi1j⨁Ti2J∑r=1kjTirJxi2j⨁⋯⨁TikjJ∑r=1kjTirJxikjj
for i∈{1,2,…,m} and j∈{1,2,…,n} where Aij denotes evaluation of the alternative Ui with respect to the attribute Ej,

where

(24)
Tirj=∏p=1r−1∑hip∈ξirjhip(dip2−2cip2+2bip2−aip2+dipcip−aipbip)+3(cip2−bip2)3hip(dip−cip+bip−aip)+6(cip−bip)(i=1,2,…,m,r=2,…,kj)
and
(25)
Ti1=1,(i=1,2,…,m).

Step 3.

Find Ai (i=1,2,…,m) by agregating all GTHF-numbers under Aij (j=1,2,…,n) using the GTHFPA operator as follows:

(26)
Ai=GTHFPA(Ai1,Ai2,…Ain)=⟨(ai,bi,ci,di);ξi⟩=Ti1∑j=1nTijAi1⨁Ti2∑j=1nTijAi2⨁…⨁Tin∑j=1nTijAin,
where
(27)
Tij=∏p=1j−1∑hip∈ξijhip(dip2−2cip2+2bip2−aip2+dipcip−aipbip)+3(cip2−bip2)3hip(dip−cip+bip−aip)+6(cip−bip)(i=1,2,…,m,j=2,…,n)
and
(28)
Ti1=1,(i=1,2,…,m).

Step 4.

Calculate the centroid values s(Ai) of Ai(i=1,2,…,m) using the Definition 3:

(29)
s(Ai)=∑hi∈ξihi(di2−2ci2+2bi2−ai2+dici−aibi)+3(ci2−bi2)3hi(di−ci+bi−ai)+6(ci−bi).

Step 5.

Rank all the alternatives Ui (i=1,2,,…,m) and select the best one(s). Here if s(As)>s(At)⇒Us>Ut (s,t∈{1,2,…,m}).

5An Application Case for Turkey

In this section, we present a MADM problem which is a software selection problem adapted/inspirated from Çelikbilek and Tüysüz (2016), Yuan et al. (2018). The application of the proposed approach is for evaluating renewable energy under subjective perspective with linguistic scales.

5.1Case Study

According to the plan of renewable energy development in Turkey, the Turkish government aims to reduce the country’s dependence on imported energy. Having insufficient quantities of domestic oil and natural gas resources to support demand, the best guarantee of security of energy supply is clearly to maintain a diversity of energy sources and to focus on renewable energy sources, which the country has abundantly. There are five alternatives which are given in Table 1: Geothermal energy U1, Solar energy U2, Biomass energy U3 and Wind energy U4. The most common attributes for renewable energy evaluation involve E1 economic, E2 technical and E3 environmental. While many national and international companies invest in these resources for a new source of income, states encourage these investments both to produce clean energy and to utilize their own resources in energy production. Therefore, our priority is environment E3. Then we evaluate wind power plants as they will have a significant contribution to the country’s economy since it is a new source of income E1, and finally, E2 technical effect. That is, in this case, there is a strict prioritization of parameters E3>E1>E2, here > indicates preference.

Table 1

Renewable energy resource alternatives.

SymbolThe renewable energy resource
U1Geothermal energy
U2Solar energy
U3Biomass energy
U4Wind energy
Table 2

GTHF-numbers for linguistic terms.

Linguistic termsLinguistic values of GTHF-numbersScore
Absolutely Low (AL)⟨(0.1,0.2,0.3,0.5);{0.1,0.2,0.4}⟩0, 0338
Very very Low (L)⟨(0.2,0.3,0.4,0.6);{0.1,0.3,0.5}⟩0, 0585
Very Low (VL)⟨(0.3,0.4,0.5,0.6);{0.2,0.4,0.7}⟩0, 0780
Fairly Low (FL)⟨(0.1,0.4,0.5,0.6);{0.2,0.4,0.6}⟩0, 0880
Low (L)⟨(0.4,0.5,0.7,0.8);{0.2,0.4,0.7}⟩0, 1560
Medium (M)⟨(0.5,0.7,0.8,0.9);{0.3,0.5,0.6}⟩0, 1657
Fairly High (FH)⟨(0.3,0.5,0.6,0.8);{0.2,0.5,0.9}⟩0, 1760
High (H)⟨(0.1,0.4,0.8,0.9);{0.1,0.3,0.5}⟩0, 1920
Very High (VH)⟨(0.2,0.5,0.6,0.7);{0.7,0.8,0.9}⟩0, 2240
Very Very High (VVH)⟨(0.6,0.7,0.8,0.9);{0.6,0.8,0.9}⟩0, 2300
Absolutely High (AH)⟨(0.4,0.5,0.7,0.9);{0.3,0.7,0.9}⟩0, 2818
Table 3

Linguistic assessment of the renewable energy alternatives based on GTHF-number.

Primary criteriaSecondary criteriaAlternativesEvaluation values
E1-Economical criterione11-Service lifeU1{(L)}
U2{(FL)}
U3{(H)}
U4{(AH)}
e12-Investment costU1{(H)}
U2{(FH)}
U3{(VH)}
U4{(AH)}
e13-Operation and maintenance costU1{(AH)}
U2{(L)}
U3{(VVH)}
U4{(FL)}
E2-Technical criterione21-AvailabilityU1{(M)}
U2{(VVH)}
U3{(H)}
U4{(L)}
e22-CapacityU1{(M)}
U2{(L)}
U3{(H)}
U4{(VH)}
e23-Resource densityU1{(FH)}
U2{(H)}
U3{(VH)}
U4{(VVH)}
e24-EfficiencyU1{(AL) }
U2{(VL)}
U3{(FH)}
U4{(VVH)}
E3-Environmental criterione31-Air pollutionU1{(AL)}
U2{(AH)}
U3{(H)}
U4{(VH)}
e32-Noise pollutionU1{(M)}
U2{(VL)}
U3{(AL)}
U4{(VVH)}

Also, description of subattributes for attributes E1, E2 and E3 is presented in Table 3 as linguistic assessment of the renewable energy alternatives based on GTHF-numbers, is given as:

  • E1: Economical attribute contains e11 = ervice life, e12 = investment cost and e13 = operation and maintenance cost. There is a strict prioritization between parameters e11>e12>e13, here > indicates preferred to.

  • E2: Technical attribute contains e21 = availability, e22 = capacity, e23 = resource density and e24 = efficiency. There is a strict prioritization between parameters e21>e22>e23>e24, here > indicates preference.

  • E3: Environmental attribute contains e31 = air pollution and e32 = noise pollution. There is a strict prioritization between parameters e31>e32, here > indicates preference.

Moreover, experts are selected from a variety of departments of faculty of engineering to increase the objectivity of the results as much as possible. Experts give their evaluation information by GTHF-numbers for linguistic terms shown in Table 2.

Then, in order to select/rank a renewable energy resource, we utilize the GTHFPA operator to develop an approach to multiple-attribute decision-making problems with GTHF information, which can be expressed by using the following algorithm:

Algorithm:

Step 1.

We constructed three GTHF sub-decision matrices for sub-attribute set Ej=⋃r=1kj{ejr} as Hj=(xirj)4×kj (i=1,2,3,4;j=1,2,3;r=k1,k2,k3;k1=1,2,3;k2=1,2,3,4;k3=1,2) for decision in Table 4–6.

Table 4

GTHF sub-decision matrices (xir1)5×3.

EconomicalService lifeInvestment cost
u1⟨(0.2,0.3,0.4,0.6);{0.1,0.3,0.5}⟩⟨(0.1,0.4,0.8,0.9);{0.1,0.3,0.5}⟩
u2⟨(0.1,0.4,0.5,0.6);{0.2,0.4,0.6}⟩⟨(0.3,0.5,0.6,0.8);{0.2,0.5,0.9}⟩
u3⟨(0.1,0.4,0.8,0.9);{0.1,0.3,0.5}⟩⟨(0.2,0.5,0.6,0.7);{0.7,0.8,0.9}⟩
u4⟨(0.4,0.5,0.7,0.9);{0.3,0.7,0.9}⟩⟨(0.4,0.5,0.7,0.9);{0.3,0.7,0.9}⟩
Maintenance cost
u1⟨(0.4,0.5,0.7,0.9);{0.3,0.7,0.9}⟩
u2⟨(0.4,0.5,0.7,0.8);{0.2,0.4,0.7}⟩
u3⟨(0.6,0.7,0.8,0.9);{0.6,0.8,0.9}⟩
u4⟨(0.1,0.4,0.5,0.6);{0.2,0.4,0.6}⟩

Table 5

GTHF sub-decision matrices (xir2)5×4.

TechnicalAvailabilityCapacity
u1⟨(0.5,0.7,0.8,0.9);{0.3,0.5,0.6}⟩⟨(0.5,0.7,0.8,0.9);{0.3,0.5,0.6}⟩
u2⟨(0.6,0.7,0.8,0.9);{0.6,0.8,0.9}⟩⟨(0.4,0.5,0.7,0.8);{0.2,0.4,0.7}⟩
u3⟨(0.1,0.4,0.8,0.9);{0.1,0.3,0.5}⟩⟨(0.1,0.4,0.8,0.9);{0.1,0.3,0.5}⟩
u4⟨(0.4,0.5,0.7,0.8);{0.2,0.4,0.7}⟩⟨(0.2,0.5,0.6,0.7);{0.7,0.8,0.9}⟩
Resource densityEfficiency
u1⟨(0.3,0.5,0.6,0.8);{0.2,0.5,0.9}⟩⟨(0.1,0.2,0.3,0.5);{0.1,0.2,0.4}⟩
u2⟨(0.1,0.4,0.8,0.9);{0.1,0.3,0.5}⟩⟨(0.3,0.4,0.5,0.6);{0.2,0.4,0.7}⟩
u3⟨(0.2,0.5,0.6,0.7);{0.7,0.8,0.9}⟩⟨(0.3,0.5,0.6,0.8);{0.2,0.5,0.9}⟩
u4⟨(0.6,0.7,0.8,0.9);{0.6,0.8,0.9}⟩⟨(0.6,0.7,0.8,0.9);{0.6,0.8,0.9}⟩

Table 6

GTHF sub-decision matrices (xir3)5×2.

EnvironmentalAir pollutionNoise pollution
u1⟨(0.1,0.2,0.3,0.5);{0.1,0.2,0.4}⟩⟨(0.5,0.7,0.8,0.9);{0.3,0.5,0.6}⟩
u2⟨(0.4,0.5,0.7,0.9);{0.3,0.7,0.9}⟩⟨(0.3,0.4,0.5,0.6);{0.2,0.4,0.7}⟩
u3⟨(0.1,0.4,0.8,0.9);{0.1,0.3,0.5}⟩⟨(0.1,0.2,0.3,0.5);{0.1,0.2,0.4}⟩
u4⟨(0.2,0.5,0.6,0.7);{0.7,0.8,0.9}⟩⟨(0.6,0.7,0.8,0.9);{0.6,0.8,0.9}⟩

Table 7

The decision makers’ evaluation of the alternatives with respect to criteria.

EconomicalTechnical
u1⟨(0.191,0.321,0.469,0.654);{0.107,0.318,0.524}⟩⟨(0.459,0.662,0.770,0.906);{0.1,0.3,0.5}⟩
u2⟨(0.159,0.426,0.533,0.651);{0.2,0.420,0.697}⟩⟨(0.497,0.627,0.801,0.910);{0.2,0.5,0.9}⟩
u3⟨(0.152,0.437,0.769,0.868);{0.286,0.475,0.655}⟩⟨(0.112,0.414,0.801,0.907);{0.7,0.8,0.9}⟩
u4⟨(0.363,0.488,0.675,0.863);{0.288,0.673,0.881}⟩⟨(0.409,0.552,0.720,0.824);{0.3,0.7,0.9}⟩
Environmental
u1⟨(0.141,0.251,0.351,0.541);{0.123,0.238,0.9}⟩
u2⟨(0.369,0.469,0.637,0.806);{0.270,0.627,0.859}⟩
u3⟨(0.1,0.366,0.715,0.832);{0.1,0.284,0.484}⟩
u4⟨(0.324,0.562,0.662,0.762);{0.672,0.8,0.9}⟩

Step 2.

We computed overall values matrix based on Eqs. (23)–(24) in Table 7.

Step 3.

We found Ai (i=1,2,…,m) by aggregated all GTHF-numbers under Aij (j=1,2,…,n) by using Eqs. (26)–(28) in Table 8.

Table 8

Ai(i=1,2,3,4) by aggregated all GTHF-numbers.

A1⟨(0.2271,0.3665,0.5053,0.6835);{0.1468,0.3409,0.5417}⟩
A2⟨(0.2470,0.4698,0.5966,0.7183);{0.2610,0.5001,0.7479}⟩
A3⟨(0.1398,0.4282,0.7730,0.8751);{0.2450,0.4363,0.6229}⟩
A4⟨(0.3703,0.5135,0.6855,0.8405);{0.3812,0.6727,0.8656}⟩

Step 4.

We calculated the centroid values s(Ai) of Ai by using Eq. (29) in Table 9.

Table 9

Centroid values s(Ai) of Ai.

s(A1)=1.3245
s(A2)=1.5383
s(A3)=1.7179
s(A4)=1.8062

Step 5.

All the alternatives Ui (i=1,2,3,4) are ranked and the best one(s) is selected. Here, if s(A4)>s(A3)>s(A2)>s(A1)⇒U4>U3>U2>U1. Thus, the most environmentally friendly renewable energy source is U4.

6Comparison and Analysis Discussion

When a decision analyst collects the data or information using GTHF-numbers, no prioritization operator can handle this information or data. The above defined GTHFN-prioritized aggregation operators are the only tool to solve this kind of information and help the decision analyst to make a decision. To demonstrate the effectiveness of the proposed method, a comparison of the decision-making results of the MADM methods based on prioritized aggregation operators of existing presented by Wei (2012), Wan et al. (2015) and Liang et al. (2017) is carried out, as shown in Table 10.

Table 10

The results from the different operators.

MethodsRanking of alternativesThe optimal alternative
The method in Wei (2012)U4>U2>U3>U1,U4
The method in Wan et al. (2015)U4>U3>U1>U2,U4
The method in Liang et al. (2017)U4>U3>U2>U1,U4
Proposed (GTHFNPA)MethodU4>U3>U2>U1,U4
Proposed (GTHFNPG) MethodU4>U3>U2>U1,U4

7Conclusion

GTHF-numbers are very useful for expressing ill-known quantities. Since aggregation operators play a vital role in decision-making, this paper investigates the prioritized MADM problems in which the attribute values are in the form of GTHF-numbers. Firstly, we introduced two aggregation techniques called generalized trapezoidal hesitant fuzzy prioritized weighted average operator and generalized trapezoidal hesitant fuzzy prioritized weighted geometric operator for aggregating the generalized trapezoidal hesitant fuzzy information. Next, we discussed some basic properties of the developed operators, namely idempotency, boundary and monotonicity. In addition, two approaches for multiple-attribute decision-making under the generalized trapezoidal hesitant fuzzy environments are developed. Finally, a practical study has been conducted to demonstrate the proposed MADM method in more practicality and effectiveness, since it considers prioritization relationships among attributes. Meanwhile, the prioritized operators of GTHF-numbers provide a new tool of information fusion for solving decision problems under hesitant environments. Further, the extensions of hesitant prioritized aggregation operators model to the MADM problems under other fuzzy environments would also be studied in the near future. In future, we plan to extend our research work to TOPSIS, ARAS, ELECTRE, WASPAS, MABAC, EDAS, QUALIFLEX, and so on. Obtaining the data and writing in this study as GTHF-numbers is the most common problem. Therefore, we will try to solve this problem in future.

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