An algorithm for determining common weights by concept of membership function
S.
Saati
Dep. of Mathematics, North Tehran Branch, Islamic Azad University, Tehran, IRAN
author
N.
Nayebi
Department of Mathematics, North Tehran Branch,
Islamic Azad University, Tehran, Iran
author
text
article
2015
eng
Data envelopment analysis (DEA) is a method to evaluate the relative efficiency of decision making units (DMUs). In this method, the issue has always been to determine a set of weights for each DMU which often caused many problems. Since the DEA models also have the multi-objective linear programming (MOLP) problems nature, a rational relationship can be established between MOLP and DEA problems to overcome the problem of determining weights. In this study, a membership function was defined base on the results of CCR model and cross efficiency, and by using this membership function in a proposed model, we obtained a common set of weights for all DMUs. Finally, by solving a sample problem, the proposed algorithm was explained.
Journal of Linear and Topological Algebra (JLTA)
Central Tehran Branch. IAU
2252-0201
04
v.
03
no.
2015
165
172
http://jlta.iauctb.ac.ir/article_520400_89cecb97be58dcac6b2d9ab306c55083.pdf
Application of triangular functions for solving the vasicek model
Z
Sadati
Department of Mathematics, Khomein Branch, Islamic
Azad University, Khomein, Iran
author
KH
Maleknejad
Department of Mathematics, Khomein Branch, Islamic
Azad University, Khomein, Iran
author
text
article
2015
eng
This paper introduces a numerical method for solving the vasicek model by using a stochastic operational matrix based on the triangular functions (TFs) in combination with the collocation method. The method is stated by using conversion the vasicek model to a stochastic nonlinear system of $2m+2$ equations and $2m+2$ unknowns. Finally, the error analysis and some numerical examples are provided to demonstrate applicability and accuracy of this method.
Journal of Linear and Topological Algebra (JLTA)
Central Tehran Branch. IAU
2252-0201
04
v.
03
no.
2015
173
182
http://jlta.iauctb.ac.ir/article_516259_edea5f32e8bdef11a754c16a1aac2551.pdf
Lie higher derivations on B(X)
S
Ebrahimi
payame noor university
author
text
article
2015
eng
Let X be a Banach space of dimX > 2 and B(X) be the space of bounded linear operators on X. If L : B(X) → B(X) be a Lie higher derivation on B(X), then there exists an additive higher derivation D and a linear map τ : B(X) → FI vanishing at commutators [A, B] for all A, B ∈ B(X) such that L = D + τ
Journal of Linear and Topological Algebra (JLTA)
Central Tehran Branch. IAU
2252-0201
04
v.
03
no.
2015
183
192
http://jlta.iauctb.ac.ir/article_516229_5cd9d40875331014fc106bff3e33fd01.pdf
Bernoulli collocation method with residual correction for solving integral-algebraic equations
F
Mirzaee
Malayer University
author
text
article
2015
eng
The principal aim of this paper is to serve the numerical solution of an integral-algebraic equation (IAE) by using the Bernoulli polynomials and the residual correction method. After implementation of our scheme, the main problem would be transformed into a system of algebraic equations such that its solutions are the unknown Bernoulli coefficients. Thismethod gives an analytic solution when the exact solutions are polynomials. Also, an error analysis based on the use of the Bernoulli polynomials is provided under several mild conditions. Several examples are included to illustrate the efficiency and accuracy of the proposed technique and also the results are compared with the different methods.
Journal of Linear and Topological Algebra (JLTA)
Central Tehran Branch. IAU
2252-0201
04
v.
03
no.
2015
193
208
http://jlta.iauctb.ac.ir/article_516842_b82d4fd2970845181637244d212a6e37.pdf
On the girth of the annihilating-ideal graph of a commutative ring
M
Ahrari
Department of Mathematics, Islamic Azad University,
Central Tehran Branch, Tehran, Iran
author
Sh. A.
Safari Sabet
Department of Mathematics, Islamic Azad Uni-
versity, Central Tehran Branch, Tehran, Iran
author
B
Amini
Department of Mathematics, College of Sciences, Shiraz
University, Shiraz, Iran
author
text
article
2015
eng
The annihilating-ideal graph of a commutative ring $R$ is denoted by $AG(R)$, whose vertices are all nonzero ideals of $R$ with nonzero annihilators and two distinct vertices $I$ and $J$ are adjacent if and only if $IJ=0$. In this article, we completely characterize rings $R$ when $gr(AG(R))neq 3$.
Journal of Linear and Topological Algebra (JLTA)
Central Tehran Branch. IAU
2252-0201
04
v.
03
no.
2015
209
216
http://jlta.iauctb.ac.ir/article_516843_242d8c3e381dbd84b96ba0414f2b9501.pdf
Analytical-Approximate Solution for Nonlinear Volterra Integro-Dierential Equations
M
Matinfar
Science of Mathematics Faculty, Department of Mathematics, University of Mazandaran,
P.O.Box 47416-95447, Babolsar, Iran
author
A
Riahifar
University of Mazandaran
author
text
article
2015
eng
In this work, we conduct a comparative study among the combine Laplace transform and modied Adomian decomposition method (LMADM) and two traditional methods for an analytic and approximate treatment of special type of nonlinear Volterra integro-differential equations of the second kind. The nonlinear part of integro-differential is approximated by Adomian polynomials, and the equation is reduced to a simple equations. The proper implementation of combine Laplace transform and modified Adomian decomposition method can extremely minimize the size of work if compared to existing traditional techniques. Moreover, three particular examples are discussed to show the reliability and the performance of method.
Journal of Linear and Topological Algebra (JLTA)
Central Tehran Branch. IAU
2252-0201
04
v.
03
no.
2015
217
228
http://jlta.iauctb.ac.ir/article_517016_69bd423e8499ffd9419710a86701e387.pdf
On fuzzy soft connected topological spaces
S
Karataş
Ordu University
author
B
Kılıç
Ordu University
author
M
Tellioğlu
Ordu University
author
text
article
2015
eng
In this work, we introduce notion of connectedness on fuzzy soft topological spaces and present fundamentals properties. We also investigate effect to fuzzy soft connectedness. Moreover, C_i-connectedness which plays an important role in fuzzy topological space extend to fuzzy soft topological spaces.
Journal of Linear and Topological Algebra (JLTA)
Central Tehran Branch. IAU
2252-0201
04
v.
03
no.
2015
229
240
http://jlta.iauctb.ac.ir/article_519630_5d16ded940a76f9f5d182667e7fcdac4.pdf