eng
Science and Research Branch, Islamic Azad University, Tehran, Iran
International Journal of Industrial Mathematics
2008-5621
2008-563X
2014-04-01
6
2
97
105
2454
مقاله پژوهشی
Fixed point theorems under c-distance in ordered cone metric space
H. Rahimi
rahimi@iauctb.ac.ir
1
G. Soleimani Rad
2
Department of Mathematics, Islamic Azad University, Central Tehran Branch, Tehran, Iran
Department of Mathematics, Islamic Azad University, Central Tehran Branch, Tehran, Iran
Recently, Cho et al. [Y. J. Cho, R. Saadati, S. H. Wang, Common xed point theorems on generalized distance in ordered cone metric spaces, Comput. Math. Appl. 61 (2011) 1254-1260] dened the concept of the c-distance in a cone metric space and proved some xed point theorems on c-distance. In this paper, we prove some new xed point and common xed point theorems by using the distance in ordered cone metric spaces.
http://ijim.srbiau.ac.ir/article_2454_0c66eca5d15a041f00e2c2a6f82b4108.pdf
Cone metric space
Common fixed point
fixed point
c-distance
Partially ordered set
eng
Science and Research Branch, Islamic Azad University, Tehran, Iran
International Journal of Industrial Mathematics
2008-5621
2008-563X
2014-04-01
6
2
107
114
2176
مقاله پژوهشی
Estimating most productive scale size in DEA with real and integer value data
Z. Moghaddas
moghaddas.sahar@gmail.com
1
M. Vaez-Ghasemi
2
Department of Electrical, Computer and biomedical Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran
Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran, Iran.
For better guiding a system, senior managers should have accurate information. Using Data Envelopment analysis (DEA) help managers in this objective. Thus, many investigations have been made in order to find the most productive scale size (MPSS) for the evaluating decision making units (DMUs). In this paper we consider this case where there exist subsets of input and output variables to be integer valued. We use data envelopment analysis (DEA) technique, which is a mathematical programming for efficiency evaluation and target setting for a set of DMUs, and develop a model with which the desired MPSS point can be found. The applicability of developed model is illustrated in the context of the analysis to show the validity of the proposed model.
http://ijim.srbiau.ac.ir/article_2176_27bf29b99d1308136d2a5141360a452d.pdf
Data envelopment analysis
Most Productive Scale Size
Integer values
eng
Science and Research Branch, Islamic Azad University, Tehran, Iran
International Journal of Industrial Mathematics
2008-5621
2008-563X
2014-04-01
6
2
115
119
2178
مقاله پژوهشی
Solving Differential Equations Using Modified VIM
F. Goharee
fgoharee@yahoo.com
1
E. Babolian
2
Department of Mathematics, Science and Research Branch, Islamic Azad
University, Tehran,Iran
Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran,Iran
In this paper a modification of He's variational iteration method (VIM) has been employed to solve Dung and Riccati equations. Sometimes, it is not easy or even impossible, to obtain the first few iterations of VIM, therefore, we suggest to approximate the integrand by using suitable expansions such as Taylor or Chebyshev expansions.
http://ijim.srbiau.ac.ir/article_2178_bf2aea3801edcaea2f8f9e8140a39709.pdf
Variational iteration method
Dung equation
Riccati equation
Taylor expansion
Chebyshev expansion
eng
Science and Research Branch, Islamic Azad University, Tehran, Iran
International Journal of Industrial Mathematics
2008-5621
2008-563X
2014-04-01
6
2
121
124
2455
مقاله پژوهشی
A new optimal method of fourth-order convergence for solving nonlinear equations
T. Lotfi
1
Department of Mathematics, Hamedan Branch, Islamic Azad University, Hamedan, Iran.
In this paper, we present a fourth order method for computing simple roots of nonlinear equations by using suitable Taylor and weight function approximation. The method is based on Weerakoon-Fernando method [S. Weerakoon, G.I. Fernando, A variant of Newton's method with third-order convergence, Appl. Math. Lett. 17 (2000) 87-93]. The method is optimal, as it needs three evaluations per iterate, namely one evaluation of function and two evaluations of rst derivative. So, Kung and Traub's conjecture is fullled. We also perform some numerical tests that conrm the theoretical results and allow us to compare the proposed method with some existing methods of the same type.
http://ijim.srbiau.ac.ir/article_2455_1496025816dd95f23717cf9b82dc9599.pdf
Nonlinear equations
Multi-point iteration
Kung and Traub conjecture
Optimal order
eng
Science and Research Branch, Islamic Azad University, Tehran, Iran
International Journal of Industrial Mathematics
2008-5621
2008-563X
2014-04-01
6
2
124
132
2456
مقاله پژوهشی
Application of iterative method for solving fuzzy Bernoulli equation under generalized H-differentiability
Sh. Sadigh Behzadi
shadan_behzadi@yahoo.com
1
Department of Mathematics, Qazvin Branch, Islamic Azad University, Qazvin, Iran.
In this paper, the Picard method is proposed to solve the Bernoulli equation with fuzzy initial condition under generalized H-differentiability. The existence and uniqueness of the solution and convergence of the proposed method are proved in details. Finally an example shows the accuracy of this method.
http://ijim.srbiau.ac.ir/article_2456_d0911c2b688efa902a43faf000e2a8ec.pdf
Bernoulli equation
Fuzzy-valued function
h-difference
Generalized differentiability
Picard
method
eng
Science and Research Branch, Islamic Azad University, Tehran, Iran
International Journal of Industrial Mathematics
2008-5621
2008-563X
2014-04-01
6
2
133
139
2390
مقاله پژوهشی
Robust stabilization of a class of three-dimensional uncertain fractional-order non-autonomous systems
A. R. Haghighi
1
M. Pourmahmood Aghababa
2
M. Roohi
3
Department of Mathematic, Urmia University of Technology, Urmia, Iran
Electrical Engineering Department, Urmia University of Technology, Urmia, Iran
Department of Mathematic, Urmia University of Technology, Urmia, Iran
This paper concerns the problem of robust stabilization of uncertain fractional-order non-autonomous systems. In this regard, a single input active control approach is proposed for control and stabilization of three-dimensional uncertain fractional-order systems. The robust controller is designed on the basis of fractional Lyapunov stability theory. Furthermore, the effects of model uncertainties are fully taken into account. Also, the robust stability and access to the equilibrium point of the control scheme are analytically proved. Moreover, fast response and easy realization in real world applications are some special features of the suggested method. Finally, as a numerical simulation, control and stabilization of three-dimensional uncertain fractional-order Chen system is provided to illustrate the usefulness and applicability of the proposed approach in practice. It is worth to notice that the proposed active control approach can be employed for robust stabilization of a large class of three-dimensional uncertain nonlinear fractional-order non autonomous dynamical systems.
http://ijim.srbiau.ac.ir/article_2390_c04cbe0d67e1f99a31d9321128c28fc8.pdf
control
Single control input
Fractional-order systems
eng
Science and Research Branch, Islamic Azad University, Tehran, Iran
International Journal of Industrial Mathematics
2008-5621
2008-563X
2014-04-01
6
2
141
155
2457
مقاله پژوهشی
Numerical solution of hybrid fuzzy differential equations by fuzzy neural network
M. Othadi
mahmoodotadi@yahoo.com
1
M. Mosleh
2
Department of Mathematics, Firoozkooh Branch, Islamic Azad University, Firoozkooh, Iran.
Department of Mathematics, Firoozkooh Branch, Islamic Azad University, Firoozkooh, Iran.
The hybrid fuzzy differential equations have a wide range of applications in science and engineering. We consider the problem of nding their numerical solutions by using a novel hybrid method based on fuzzy neural network. Here neural network is considered as a part of large eld called neural computing or soft computing. The proposed algorithm is illustrated by numerical examples and the results obtained using the scheme presented here agree well with the analytical solutions.
http://ijim.srbiau.ac.ir/article_2457_79cd1f62d1157b6d4033ed59f05249c8.pdf
Hybrid fuzzy differential equations
Fuzzy neural networks
Learning algorithm
eng
Science and Research Branch, Islamic Azad University, Tehran, Iran
International Journal of Industrial Mathematics
2008-5621
2008-563X
2014-04-01
6
2
157
168
2473
مقاله پژوهشی
Evaluation of customer satisfaction about Bank service quality
A. R. Shahraki
shahrakiar@hamoon.usb.ac.ir
1
Department of Industrial Engineering University of Sistan and Baluchestan, Zahedan, Iran.
This research has studied and ranked the service quality and its relation with customers' satisfaction in a bank in Iran. In the theoretical principles section, the concepts and denitions related to services, satisfaction, banking and research background have been studied. The statistical community of the study was all the bank customers that have referred to the bankand have had interest-free loans savings accounts or current accounts. The study statistical sample was calculated using the formula; then a questionnaire was designed and distributed among sample members and nally, the research hypotheses were examined using collected data. Pearson correlation coecient test was used to test the first hypothesis and specically related hypotheses. Also, the Friedman ranking test was used to test the second hypothesis. The rst hypothesis test results showed that there is a positive and signicant relationship between service quality and customers' satisfaction. The second hypothesis test results also showed that there are signicant differences among the priorities of the constituent elements of service quality.
http://ijim.srbiau.ac.ir/article_2473_aa6c6613e0922df27715a658a1b5282c.pdf
quality
Service
Customers' satisfaction
Quality of Banking services
Bank
eng
Science and Research Branch, Islamic Azad University, Tehran, Iran
International Journal of Industrial Mathematics
2008-5621
2008-563X
2014-04-01
6
2
169
176
2486
مقاله پژوهشی
On the relative efficiency in general network structures
F. Boloori
1
J. Pourmahmoud Gazijahani
pourmahmoud@azaruniv.ac.ir
2
Azarbayjan Shahid Madani University, Department of Science, Tabriz, Iran.
Azarbayjan Shahid Madani University, Department of Science, Tabriz, Iran.
Data Envelopment Analysis (DEA) is an eciency measurement tool for evaluation of similar Decision Making Units (DMUs). In DEA, weights are assigned to inputs and outputs and the absolute eciency score is obtained by the ratio of weighted sum of outputs to weighted sum of inputs. In traditional DEA models, this measure is also equivalent with relative eciency score which evaluates DMUs in compare with the most ecient DMU. Recently network DEA models are appeared in the literature, which try to assess DMUs regarding their internal production divisions and intermediate products. In this paper we compare absolute and relative eciency scores in network framework. Since in network DEA models, an ecient DMU does not exist necessarily, the relative eciency model helps us to have at least one ecient DMU in our assessments.
http://ijim.srbiau.ac.ir/article_2486_d8496f4cf90d2a8b66e9ec0683847986.pdf
Network DEA
Absolute efficiency
Relative efficiency
Divisional efficiency
Overall efficiency