eng
Islamic Azad University, Central tehran Branch
International Journal of Mathematical Modelling & Computations
2228-6225
2228-6233
2015-03-21
5
3 (SUMMER)
203
217
521893
APPLICATION OF DIFFERENTIAL TRANSFORM METHOD TO SOLVE HYBRID FUZZY DIFFERENTIAL EQUATIONS
Mahmoud Paripour
1
Homa Heidari
2
Elahe Hajilou
3
Department of Mathematics, Hamedan University of Technology, Hamedan, 65156-579, Iran Iran, Islamic Republic of
In this paper, we study the numerical solution of hybrid fuzzy differential equations by using differential transformation method (DTM). This is powerful method which consider the approximate solution of a nonlinear equation as an infinite series usually converging to the accurate solution. Several numerical examples are given and by comparing the numerical results obtained from DTM and predictor corrector method (PCM), we have studied their accuracy.
http://ijm2c.iauctb.ac.ir/article_521893_11d199143a20284ba68e4110d9a3ef7c.pdf
Hybrid systems
Fuzzy Differential Equations
Differential transformation method
eng
Islamic Azad University, Central tehran Branch
International Journal of Mathematical Modelling & Computations
2228-6225
2228-6233
2015-03-21
5
3 (SUMMER)
219
230
521894
SOLVING NONLINEAR TWO-DIMENSIONAL VOLTERRA INTEGRAL EQUATIONS OF THE FIRST-KIND USING BIVARIATE SHIFTED LEGENDRE FUNCTIONS
Somayeh Nemati
1
Y. Ordokhani
2
Department of Mathematics, Faculty of Mathematical Sciences, University of Mazandaran, Babolsar, Iran
In this paper, a method for ﬁnding an approximate solution of a class of two-dimensional nonlinear Volterra integral equations of the ﬁrst-kind is proposed. This problem is transformedto a nonlinear two-dimensional Volterra integral equation of the second-kind. The properties ofthe bivariate shifted Legendre functions are presented. The operational matrices of integrationtogether with the product operational matrix are utilized to reduce the solution of the second-kind equation to the solution of a system of linear algebraic equations. Finally, a system of nonlinear algebraic equations is obtained to give an approximate solution of the main problem.Also, numerical examples are included to demonstrate the validity and applicability of themethod.
http://ijm2c.iauctb.ac.ir/article_521894_1a1bab748595b2561def4ba4337444d0.pdf
eng
Islamic Azad University, Central tehran Branch
International Journal of Mathematical Modelling & Computations
2228-6225
2228-6233
2015-03-21
5
3 (SUMMER)
231
244
521895
AN M/G/1 QUEUE WITH REGULAR AND OPTIONAL PHASE VACATION AND WITH STATE DEPENDENT ARRIVAL RATE
Rathinasabapathy Kalyanaraman
1
Shanthi R
2
Professor of Mathematics, Annamalai University India Professor of Mathematics 2nd
Assistant professor Annamalai University India Research Scholar
We consider an M/G/1 queue with regular and optional phase vacation and withstate dependent arrival rate. The vacation policy is after completion of service if there are no customers in the system, the server takes vacation consisting of K -phases, each phase is generally distributed. Here the first phase is compulsory where as the other phases are optional. For this model the supplementary variable technique has been applied to obtain the probability generating functions of number of customers in the queue at the different server states. Some particular models are obtained and a numerical study is also carried out.
http://ijm2c.iauctb.ac.ir/article_521895_f2fc87bb39b9aea01c40c8a3b043a93c.pdf
Vacation queue
Supplementary variable
Probability generating function
Performance Measures
eng
Islamic Azad University, Central tehran Branch
International Journal of Mathematical Modelling & Computations
2228-6225
2228-6233
2015-03-21
5
3 (SUMMER)
245
249
521896
A NOTE ON "A SIXTH ORDER METHOD FOR SOLVING NONLINEAR EQUATIONS"
Paria Assari
1
Taher Lotfi
2
ORCID iD Islamic Azad University, Hamedan Branch Iran, Islamic Republic of
Islamic Azad University, Hamedan Branch Iran, Islamic Republic of
In this study, we modify an iterative non-optimal without memory method, in such a way that is becomes optimal. Therefore, we obtain convergence order eight with the some functional evaluations. To justify our proposed method, some numerical examples are given.
http://ijm2c.iauctb.ac.ir/article_521896_befec15218a721a47ab610bec0cccd76.pdf
Nonlinear equation
Multi-point method
Convergence order
optimal method
eng
Islamic Azad University, Central tehran Branch
International Journal of Mathematical Modelling & Computations
2228-6225
2228-6233
2015-03-21
5
3 (SUMMER)
251
258
521897
A STRONG COMPUTATIONAL METHOD FOR SOLVING OF SYSTEM OF INFINITE BOUNDARY INTEGRO-DIFFERENTIAL EQUATIONS
M. Matinfar
1
Abbas Riahifar
2
H. Abdollahi
3
University of Mazandaran Iran, Islamic Republic of
University of Mazandaran Iran, Islamic Republic of
University of Mazandaran Iran, Islamic Republic of
The introduced method in this study consists of reducing a system of
infinite boundary integro-differential equations (IBI-DE) into a system of al-
gebraic equations, by expanding the unknown functions, as a series in terms
of Laguerre polynomials with unknown coefficients. Properties of these polynomials and operational matrix of integration are rst presented. Finally, two examples illustrate the simplicity and the effectiveness of the proposed method have been presented.
http://ijm2c.iauctb.ac.ir/article_521897_dd53f77e9948b823e9528d4890723b02.pdf
Systems of infinite boundary integro-differential equations
Laguerre polynomial
Operational matrix
eng
Islamic Azad University, Central tehran Branch
International Journal of Mathematical Modelling & Computations
2228-6225
2228-6233
2015-03-21
5
3 (SUMMER)
259
266
521898
NON-STANDARD FINITE DIFFERENCE METHOD FOR NUMERICAL SOLUTION OF SECOND ORDER LINEAR FREDHOLM INTEGRO-DIFFERENTIAL EQUATIONS
Pramod Kumar Pandey
1
Dyal Singh College (University of Delhi) India Department of Mathematics
In this article we have considered a non-standard finite difference method for the solution of second order Fredholm integro differential equation type initial value problems. The non-standard finite difference method and the composite trapezoidal quadrature method is used to transform the Fredholm integro-differential equation into a system of equations. We have also developed a numerical method for the numerical approximation of the derivative of the solution of the problems. The numerical results in experiment on some model problems show the simplicity and efficiency of the method. Numerical results showed that the proposed method is convergent and at least second order of accurate.
http://ijm2c.iauctb.ac.ir/article_521898_32967f6ff19abe072f50f8aa3fcfbee3.pdf
eng
Islamic Azad University, Central tehran Branch
International Journal of Mathematical Modelling & Computations
2228-6225
2228-6233
2015-03-21
5
3 (SUMMER)
267
275
521899
OPTIMUM GENERALIZED COMPOUND LINEAR PLAN FOR MULTIPLE-STEP STEP-STRESS ACCELERATED LIFE TESTS
Navin Chandra
1
Mashroor Ahmad Kha
2
Pondicherry University India Department of Statistics
In this paper, we consider an i.e., multiple step-stress accelerated life testing (ALT) experiment with unequal duration of time . It is assumed that the time to failure of a product follows Rayleigh distribution with a log-linear relationship between stress and lifetime and also we assume a generalized Khamis-Higgins model for the effect of changing stress levels. Taking into account that the problem of choosing the optimal time for 3-step step-stress tests under compound linear plan was initially attempted by Khamis and Higgins [16]. We ever first have developed a generalized compound linear plan for multiple-step step-stress setting using variance-optimality criteria. Some numerical examples are discussed to illustrate the proposed procedures.
http://ijm2c.iauctb.ac.ir/article_521899_a1b98c705e35eb1d9bf4134aeb42c99d.pdf
accelerated life testing
Rayleigh distribution
cumulative exposure model
maximum likelihood estimate
generalized compound linear plan
eng
Islamic Azad University, Central tehran Branch
International Journal of Mathematical Modelling & Computations
2228-6225
2228-6233
2015-03-21
5
3 (SUMMER)
277
289
521900
EFFECT OF COUNTERPROPAGATING CAPILLARY GRAVITY WAVE PACKETS ON THIRD ORDER NONLINEAR EVOLUTION EQUATIONS IN THE PRESENCE OF WIND FLOWING OVER WATER
A. K. Dhar
1
Joydev Mondal
2
IIEST,WESTBENGAL,INDIA India IIEST,MATHEMATICS,SHIBPUR,WESTBENGAL, INDIA
Asymptotically exact and nonlocal third order nonlinear evolution equations are derivedfor two counterpropagating surface capillary gravity wave packets in deep water in thepresence of wind flowing over water.From these evolution equations stability analysis ismade for a uniform standing surface capillary gravity wave trains for longitudinal perturbation. Instability condition is obtained and graphs are plotted for maximum growth rateof instability and for wave number at marginal stability against wave steepness for some different values of dimensionless wind velocity.
http://ijm2c.iauctb.ac.ir/article_521900_51557679a6b3d954e0b4ef9069f65976.pdf