Caspian Journal of Mathematical Sciences (CJMS)Caspian Journal of Mathematical Sciences (CJMS)
http://cjms.journals.umz.ac.ir/
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http://cjms.journals.umz.ac.ir/
Feed provided by Caspian Journal of Mathematical Sciences (CJMS). Click to visit.Preface
http://cjms.journals.umz.ac.ir/article_1726_302.html
Fri, 30 Jun 2017 19:30:00 +0100Multi-step conformable fractional differential transform method for solving and stability of ...
http://cjms.journals.umz.ac.ir/article_1649_0.html
In this article‎, ‎the multi-step conformable fractional differential transform method (MSCDTM) is applied to give approximate solutions of the conformable fractional-order differential systems‎. ‎Moreover‎, ‎we check the stability of conformable fractional-order L"{u} system with the MSCDTM to demonstrate the efficiency and effectiveness of the proposed procedure.Fri, 30 Jun 2017 19:30:00 +0100The Uniqueness of a Certain Type of Subdirect Product
http://cjms.journals.umz.ac.ir/article_1650_302.html
We introduce the "$type{lffs}$ subdirect product" and show that every ring is uniquely a $type{lffs}$ subdirect product of a family of $simple{basicls}$ rings. Also we show some applications.Sat, 30 Sep 2017 20:30:00 +0100Growth Properties of the Cherednik-Opdam Transform in the Space Lp
http://cjms.journals.umz.ac.ir/article_1666_0.html
‎In this paper‎, ‎using a generalized translation operator‎, ‎we obtain a generalization of Younis Theorem 5.2 in [3] for the Cherednik-Opdam transform for functions satisfying the $(delta,gamma,p)$-Cherednik-Opdam Lipschitz condition in the space‎ ‎$L^{p}_{alpha,beta}(mathbb{R})$.Wed, 29 Nov 2017 20:30:00 +0100Collocation Method using Compactly Supported Radial Basis Function for Solving Volterra's ...
http://cjms.journals.umz.ac.ir/article_1695_302.html
‎In this paper‎, ‎indirect collocation approach based on compactly supported radial basis function (CSRBF) is applied for solving Volterra's population model. The method reduces the solution of this problem to the solution of a system of algebraic equations‎. ‎Volterra's model is a non-linear integro-differential equation where the integral term represents the effect of toxin‎. ‎To solve the problem‎, ‎we use the well-known CSRBF‎: ‎$Wendland_{3,5}$‎. ‎Numerical results and residual norm ($|R(t)|^2$) show good accuracy and rate of convergence‎.Fri, 30 Jun 2017 19:30:00 +0100Vector Valued multiple of $\chi^{2}$ over $p$-metric sequence spaces defined by Musielak
http://cjms.journals.umz.ac.ir/article_1327_302.html
In this article, we define the vector valued multiple of $chi^{2}$ over $p$-metric sequence spaces defined by Musielak and study some of their topological properties and some inclusion results.Fri, 30 Jun 2017 19:30:00 +0100On the Quaternionic Curves in the Semi-Euclidean Space E_4_2
http://cjms.journals.umz.ac.ir/article_1667_0.html
In this study, we investigate the semi-real quaternionic curves in the semi-Euclidean space E_4_2. Firstly, we introduce algebraic properties of semi-real quaternions. Then, we give some characterizations of semi-real quaternionic involute-evolute curves in the semi-Euclidean space E42 . Finally, we give an example illustrated with Mathematica Programme.Wed, 29 Nov 2017 20:30:00 +0100Some points on generalized open sets
http://cjms.journals.umz.ac.ir/article_1651_302.html
The paper is an attempt to represent a study of limit points, boundary points, exterior points, border, interior points and closure points in the common generalized topological space. This paper takes a look at the possibilities of an extended topological space and it also considers the new characterizations of dense set.Fri, 30 Jun 2017 19:30:00 +0100Differential Transform Method to two-dimensional non-linear wave equation
http://cjms.journals.umz.ac.ir/article_1633_0.html
In this paper, an analytic solution is presented using differential transform method (DTM) for a class of wave equation. The emphasis is on the nonlinear two-dimensional wave equation. The procedures introduced in this paper are in recursive forms which can be used to obtain the closed form of the solutions, if they are required. The method is tested on various examples, and the results reveal the effectiveness and simplicity of the method.Fri, 30 Sep 2016 20:30:00 +0100Inverse problem for Sturm-Liouville operators with a transmission and parameter dependent ...
http://cjms.journals.umz.ac.ir/article_1653_302.html
In this manuscript, we consider the inverse problem for non self-adjoint Sturm--Liouville operator $-D^2+q$ with eigenparameter dependent boundary and discontinuity conditions inside a finite closed interval. We prove by defining a new Hilbert space and using spectral data of a kind, the potential function can be uniquely determined by a set of value of eigenfunctions at an interior point and part of two sets of eigenvalues.Sun, 09 Apr 2023 19:30:00 +0100A Heuristic Optimization Algorithm Based on Expansion of Fashion in Human Society
http://cjms.journals.umz.ac.ir/article_1698_0.html
In this article, inspired by a mathematical modeling of fashionability, we propose an optimization algorithm. Our proposed algorithm works as follows. It starts from a set of individuals in an initial state. These individuals are supposed to be possible answers to a given optimization problem (similar to chromosome in genetic algorithm, and particles in Particle Swarm Optimization). The Individuals are divided into two categories: 1. Stars 2. Followers. Stars attract the followers toward themselves through diffusion of innovation and fashion. The emergence of new fashion from the old fashion forms the fundamental core of this algorithm and makes the followers move toward the optimum points of the given problem. In this article, fashionability is viewed as an indispensable part of cultural evolutionary process of human and the quality of its impact on different individuals is being used in the field of evolutionary computation. This article is intended to describe how to model fashionability, and how to implement an optimization algorithm based on the modeling.Fri, 30 Sep 2016 20:30:00 +0100VM Consolidation by using Selection and Placement of VMs in Cloud Datacenters
http://cjms.journals.umz.ac.ir/article_1697_302.html
The Cloud Computing model leverages virtualization of computing resources allowing customers to provision resources on-demand on a pay-as-you-go basis. During recent years, the power consumption of datacenters in cloud environment attracted researchers. Optimization of energy consumption can be performed by different methods including virtual machine (VM) consolidation. This technique can reduce energy consumption by preventing of wasting them. Also, VM migration can provide opportunity to reduce energy consumption. In this article, we want to study dif-ferent methods and policies to select and place VMs and migration algorithms for underutilized and over-utilized servers in order to reduce energy consumption and SLA violation. We offer general and comprehensive framework on optimization of VM consolidation as its owchart and at last, suggest combined idea to detect underloaded and overloaded hosts and also VM selection and VM placement policies.Fri, 30 Jun 2017 19:30:00 +0100Numerical solution of higher index DAEs using their IAE's structure: Trajectory-prescribed path ...
http://cjms.journals.umz.ac.ir/article_1699_0.html
In this paper, we solve higher index differential algebraic equations (DAEs) by transforming them into integral algebraic equations (IAEs). We apply collocation methods on continuous piece-wise polynomials space to solve the obtained higher index IAEs. The efficiency of the given method is improved by using a recursive formula for computing the integral part. Finally, we apply the obtained algorithm to solve a trajectory-prescribed path control problem and a model of simple pendulum. The numerical experiments show efficiency of the given techniques.Tue, 12 Dec 2017 20:30:00 +0100Generalized Helices and Singular Points
http://cjms.journals.umz.ac.ir/article_1665_302.html
In this paper, we define X-slant helix in Euclidean 3-space and we obtain helix, slant helix, clad and g-clad helix as special case of the X-slant helix. Then we study Darboux, tangential darboux developable surfaces and their singular points. Especially we show that the striction lines of these surfaces are singular locus of the surfaces.Fri, 30 Jun 2017 19:30:00 +0100An effective method for approximating the solution of singular integral equations with Cauchy ...
http://cjms.journals.umz.ac.ir/article_1700_0.html
In present paper, a numerical approach for solving Cauchy type singular integral equations is discussed. Lagrange interpolation with Gauss Legendre quadrature nodes and Taylor series expansion are utilized to reduce the computation of integral equations into some algebraic equations. Finally, five examples with exact solution are given to show efficiency and applicability of the method. Also, we give the maximum of computed absolute errors for some examples.Tue, 12 Dec 2017 20:30:00 +0100A New Method for Computing Determinants By Reducing The Orders By Two
http://cjms.journals.umz.ac.ir/article_1701_0.html
In this paper we will present a new method to calculate determinants of square matrices. The method is based on the Chio-Dodgson's condensation formula and our approach automatically affects in reducing the order of determinants by two. Also, using the Chio's condensation method we present an inductive proof of Dodgson's determinantal identity.Tue, 12 Dec 2017 20:30:00 +0100Bounds on First Reformulated Zagreb Index of Graph
http://cjms.journals.umz.ac.ir/article_1716_0.html
The first reformulated Zagreb index $EM_1(G)$ of a simple graph $G$ is defined as the sum of the terms $(d_u+d_v-2)^2$ over all edges $uv$ of $G .$ In this paper, the various upper and lower bounds for the first reformulated Zagreb index of a connected graph interms of other topological indices are obtained.Thu, 21 Dec 2017 20:30:00 +0100Solving Inverse Sturm-Liouville Problems with Transmission Conditions on Two Disjoint Intervals
http://cjms.journals.umz.ac.ir/article_1717_0.html
‎In the present paper‎, ‎some spectral properties of boundary value problems of Sturm-Liouville type on two disjoint bounded intervals with transmission boundary conditions are investigated‎. ‎Uniqueness theorems for the solution of the inverse problem are proved‎, ‎then we study the reconstructing of the coefficients of the Sturm-Liouville problem by the spectrtal mappings method.Thu, 21 Dec 2017 20:30:00 +0100Broadcast Routing in Wireless Ad-Hoc Networks: A Particle Swarm optimization Approach
http://cjms.journals.umz.ac.ir/article_1718_0.html
While routing in multi-hop packet radio networks (static Ad-hoc wireless networks), it is crucial to minimize power consumption since nodes are powered by batteries of limited capacity and it is expensive to recharge the device. This paper studies the problem of broadcast routing in radio networks. Given a network with an identified source node, any broadcast routing is considered as a directed tree rooted at the source node and spans all nodes. Since the problem is known to be NP-Hard, we try to tackle it heuristically. First we propose an efficient Particle Swarm Optimization (PSO) based algorithm with a proper coding schema. Then we present the second algorithm which combines the global search of the first algorithm with a local search strategy based on noising methods. Comprehensive experimental study is devoted to compare the behavior of the algorithms and to show its priority over the best known previous esults.Tue, 26 Dec 2017 20:30:00 +0100