Islamic Azad University, Central Tehran Branch International Journal of Mathematical Modelling & Computations 2228-6225 9 3 (SUMMER) 2019 09 30 The Numerical Solution of Klein-Gorden Equation by Using Nonstandard Finite Difference 165 174 671016 EN Hoda Shekarabi School of Mathematics‎, ‎Iran University of Science and Technology‎, ‎Narmak‎, ‎Tehran 1684613114‎, ‎Iran Jalil Rashidinia School of Mathematics‎, ‎Iran University of Science and Technology‎, ‎Narmak‎, ‎Tehran 1684613114‎, ‎Iran 0000-0002-9177-900x Journal Article 2019 03 15 ‎In this paper we propose a numerical scheme to solve the one dimensional nonlinear Klein-Gorden equation‎. ‎We describe the mathematical formulation procedure in details‎. ‎The scheme is three level explicit and based on nonstandard finite difference‎. ‎It has nonlinear denominator function of the step sizes‎. ‎Stability analysis of the method has been given and we prove that the proposed method when applied to one dimensional nonlinear Klein-Gorden equation‎, ‎is unconditionally stable‎. ‎We illustrate the usefulness of the proposed method by applying it on two examples.
Islamic Azad University, Central Tehran Branch International Journal of Mathematical Modelling & Computations 2228-6225 9 3 (SUMMER) 2019 09 30 A Three-Point Iterative Method for Solving Nonlinear Equations with High Efficiency Index 175 185 671015 EN Mohammed Waziri Yusuf Department of‎ ‎Mathematical sciences, ‎‎Faculty of Science‎, ‎Bayero University Kano, Kano‎, ‎Nigeria Kabir Saminu Department of‎ ‎Mathematics‎, ‎School of General Studies, ‎‎Dr‎. ‎Yusufu Bala Usman College Daura‎, ‎Katsina, Katsina‎, ‎Nigeria Journal Article 2019 04 03 In this paper, we proposed a three-point iterative method for finding the simple roots of non- linear equations via mid-point and interpolation approach. The method requires one evaluation of the derivative and three(3) functions evaluation with efficiency index of 81/4 ≈ 1.682. Numerical results reported here, between the proposed method with some other existing methods shows that our method is promising.
Islamic Azad University, Central Tehran Branch International Journal of Mathematical Modelling & Computations 2228-6225 9 3 (SUMMER) 2019 09 30 Sturm-Liouville Fuzzy Problem with Fuzzy Eigenvalue Parameter 187 195 670752 EN Hülya Gültekin Çitil Department of Mathematics, Faculty of Arts and Sciences, Giresun University, Giresun, Turkey. Journal Article 2019 07 30 This study is on the fuzzy eigenvalues and fuzzy eigenfunctions of the Sturm-Liouville fuzzy problem with fuzzy eigenvalue parameter. We find fuzzy eigenvalues and fuzzy eigenfunctions of the problem under the approach of Hukuhara differentiability. We solve an example. We draw the graphics of eigenfunctions. We show that eigenfunctions are valid fuzzy functions or not.
Islamic Azad University, Central Tehran Branch International Journal of Mathematical Modelling & Computations 2228-6225 9 3 (SUMMER) 2019 09 30 Efficiency of Centralized Structures in Data Envelopment Analysis Ratio Models 197 199 671017 EN Shabnam Razavyan Department of Mathematics, Islamic Azad University, South Tehran Branch, Tehran, Iran Journal Article 2019 01 17 This paper investigates the centralized resource allocation with centralized structures by using the data envelopment analysis-ratio (DEA-R) models. To this end, it proposes a method to determine the resource allocation of centralized structures such that the ratio of inputs to outputs are minimized.
Islamic Azad University, Central Tehran Branch International Journal of Mathematical Modelling & Computations 2228-6225 9 3 (SUMMER) 2019 09 30 A New Five-Parameter Distribution: Properties and Applications 201 212 671014 EN Anita Abdollahi Nanvapisheh Department of Mathematics, Tehran North Branch, Islamic Azad University, Tehran, Iran Journal Article 2019 03 05 In this paper, a new five-parameter lifetime and reliability distribution named “the exponentiated Uniform-Pareto distribution (EU-PD),” has been suggested that it has a bathtub-shaped and inverse bathtub-shape for modeling lifetime data. This distribution has applications in economics, actuarial modelling, reliability modeling, lifetime and biological sciences. Firstly, the mathematical and statistical characteristics of the proposed distribution are presented, then the applications of the new distribution are studied using the real data set. Its first moment about origin and moments about mean have been obtained and expressions for skewness, kurtosis have been given. Various mathematical and statistical properties of the proposed distribution have been discussed. Estimation of its parameter has been discussed using the method of maximum likelihood. A simulation study is given. Finally, two applications of the new distribution have been discussed with two real income and lifetime data setsThe results also confirmed the suitability of the presented models for real data collection.
Islamic Azad University, Central Tehran Branch International Journal of Mathematical Modelling & Computations 2228-6225 9 3 (SUMMER) 2019 09 30 Mathematical Model for Transmission Dynamics of Hepatitus C Virus with Optimal Control Strategies 213 237 671018 EN Mamo Wameko Department of Mathematics, Wollega University, Nekemte, Ethiopia. 0000-0003-4246-9651 Journal Article 2019 06 10 <span>An epidemic model with optimal control strategies was investigated for Hepatitus C Viral disease that can be transmitted through infected individuals. In this study, we used a deterministic compartmental model for assessing the effect of different optimal control strategies for controlling the spread of Hepatitus C disease in the community. Stability theory of differential equations is used to study the qualitative behavior of the system. The basic reproduction number that represents the epidemic indicator is obtained by using the condition of endemicity. Both the local stability and global stability conditions for disease free equilibrium is established. Uniqueness of endemic equilibrium point and its global stability conditions are proved. Numerical simulation of the model showed that applying all the intervention strategies can successfully eliminate Hepatitus C viral disease from the community.</span>