International Journal of Mathematical Modelling & ComputationsInternational Journal of Mathematical Modelling & Computations
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Feed provided by International Journal of Mathematical Modelling & Computations. Click to visit.A Study on State Dependent Accessible and Second Optional Service Queue with Impatient and ...
http://ijm2c.iauctb.ac.ir/article_665695_1132711.html
In this paper, we study a single server Markovian queue with state dependent accessible services, reneging and feedback of customers. The server can accommodate at the most $d$ customers in the service station, after which the new arrivals have to wait in the primary queue of infinite waiting space. All arrivals demand First Essential Service (FES), after completing FES, customers decide to join the second optional Service (SOS) with a probability. The services occur singly according to first come first served service discipline and service times in FES and SOS are exponentially distributed. A customer waiting in the primary queue may get impatient and renege from the queue. However, after completing SOS, if the customer is not satisfied with the service quality, he may join the queue again (feedback). The system is analyzed by a quasi birth-death process and the steady state probabilities of the model are obtained using matrix geometric method. Some performance measures and numerical illustrations are also provided. An optimization of the cost function is performed to find the optimal service rate that minimizes the total cost.Fri, 31 Aug 2018 19:30:00 +0100Compare Adomian Decomposition Method and Laplace Decomposition Method for Burger's-Huxley and ...
http://ijm2c.iauctb.ac.ir/article_663827_1132711.html
In this paper, Adomian decomposition method (ADM) and Laplace decomposition method (LDM) used to obtain series solutions of Burgers-Huxley and Burgers-Fisher Equations. In ADM the algorithm is illustrated by studying an initial value problem and LDM is based on the application of Laplace transform to nonlinear partial differential equations. In ADM only few terms of the expansion are required to obtain the approximate solution which is found to be accurate and effcient and in LDM does not need linearization, weak nonlinearity assumptions, or perturbation theory. These methods are used to solve the examples and the results are presented in the tables.Fri, 31 Aug 2018 19:30:00 +0100A stable iteration to the matrix inversion
http://ijm2c.iauctb.ac.ir/article_663845_1132711.html
The matrix inversion plays a signifcant role in engineering and sciences. Any nonsingular square matrix has a unique inverse which can readily be evaluated via numerical techniques such as direct methods, decomposition scheme, iterative methods, etc. In this research article, first of all an algorithm which has fourth order rate of convergency with conditional stability will be proposed. Then, for solving stability issue, we introduce a coupled stable scheme that can evaluate the matrix inversion with very acceptable accuracy. Furthermore, the convergence and stability properties of the proposed schemes will be analyzed in details. Numerical experiments are adopted to illustrate the properties of the modified methods.Fri, 31 Aug 2018 19:30:00 +0100Optimal Control of Hand, Foot and Mouth Disease Model using Variational Iteration Method
http://ijm2c.iauctb.ac.ir/article_665696_1132711.html
In this paper, the optimal control of transmission dynamics of hand, foot and mouth disease (HFMD), formulated by a compartmental deterministic SEIPR (Susceptible-Incubation (Exposed)- Infected - Post infection virus shedding - Recovered) model with vaccination and treatment as control parameters is considered. The objective function is based on the combination of minimizing the number of infected individuals and the cost involved in the interventions of vaccination given to the susceptible population and treatment given to the infected population. The existence for the optimal control pair is proved and the characterization of the optimal control pair is obtained by applying the Pontryagin's maximum principle. The variational iteration method is adopted to solve the non-linear Hamilton equations derived from the Pontryagin's maximum principle theory. These equations constitute a two-point boundary value problem. By considering the correction functionals of the Hamilton equations, the Lagrange multipliers are easily identified and practical iteration formulas are derived. An algorithm is developed, based on this formulas, to determine iteratively the solutions of the Hamilton equations with a desired accuracy. With the aid of solutions obtained, the optimal control law can be easily deduced. The results were analyzed and interpreted graphically using Maple.Fri, 31 Aug 2018 19:30:00 +0100A bi-level formulation for centralized resource allocation DEA models
http://ijm2c.iauctb.ac.ir/article_665587_0.html
In this paper, the common centralized DEA models are extended to the bi-level centralized resource allocation (CRA) models based on revenue efficiency. Based on the Karush–Kuhn–Tucker (KKT) conditions, the bi-level CRA model is reduced to a one-level mathematical program subject to complementarity constraints (MPCC). A recurrent neural network is developed for solving this one-level mathematical programming problem. Under a proper assumption and utilizing a suitable Lyapunov function, it is shown that the proposed neural network is Lyapunov stable and convergent to an exact optimal solution of the original problem. Finally, an illustrative example is elaborated to substantiate the applicability and effectiveness of the proposed approach.Fri, 14 Jun 2019 19:30:00 +0100An Efficient Neurodynamic Scheme for Solving a Class of Nonconvex Nonlinear Optimization Problems
http://ijm2c.iauctb.ac.ir/article_665697_1132711.html
‎By p-power (or partial p-power) transformation‎, ‎the Lagrangian function in nonconvex optimization problem becomes locally convex‎. ‎In this paper‎, ‎we present a neural network based on an NCP function for solving the nonconvex optimization problem‎. An important feature of this neural network is the one-to-one correspondence between its equilibria and KKT points of the nonconvex optimization problem. the proposed neural network is proved to be stable and convergent to an optimal solution of the original problem‎. ‎Finally‎, an ‎examples is provided to show the applicability of the proposed neural network‎.Fri, 31 Aug 2018 19:30:00 +0100An Approximation Method for Fuzzy Fixed-Charge Transportation Problem
http://ijm2c.iauctb.ac.ir/article_663826_1132711.html
In this paper, we develop the fuzzy fixed charge transportation problem when the costs are the fuzzy numbers. The first step it transform into the classical fuzzy transportation problem. The next, we obtain the best approximation fuzzy on the optimal value of the fuzzy fixed-charge transportation problem. This method obtains a lower and upper bounds both on the fuzzy optimal value of the fuzzy fixed-charge transportation problem which can be easily obtained by using the approximation solution. Finally, the results of this paper have been illustrated by a numerical example.Fri, 31 Aug 2018 19:30:00 +0100Mathematical Model for Designing the Cultural Center of Tehran with the Approach of Popularity ...
http://ijm2c.iauctb.ac.ir/article_666720_0.html
Nowadays high trend of human machinery life, high utilizing vehicles, avoiding urban public place along with neglecting identity, cultural and social values of these places make that the places in urban different scales dismiss their importance and real role. In recent decades, designing public places in urban different scales has been considered as awesome effort to meet human social needs. Therefor the purpose of writing the current research is to identify and rank driving affecting factors on designing cultural center in Tehran. The research is applicable from goal view and descriptive from data collection. Data gathering tool is questionnaire from which library and fieldwork were utilized for its designation. Statistical society includes 10000 people who pass or exist in special region of Tehran from which 384 ones were selected as statistical sample. Sampling strategy was simple random too. To measure affecting factors on designing cultural center, five main dimensions include physical, social, activities, economic and environmental factors were utilized. For this mean, a questionnaire includes 45 questions was designed and distributed among statistical society. The results of applying structural equation model in LISREL software environment illustrated that all mentioned dimensions affect significantly and positively on designing cultural center. Meanwhile the influence of environmental factors on designing cultural center was more than others. Continuously by applying fuzzy TOPSIS technique, all sub criteria were ranked that “adjoining nature and natural elements”, “existing green area in enclosure” and “facility of study” were selected as the most important factors.Fri, 02 Aug 2019 19:30:00 +0100