• Journal of applied mathematics & informatics
• /
• 제7권1호
• /
• pp.183-193
• /
• 2000

In this paper we use measure theory to solve a wide range of second-order boundary value ordinary differential equations. First, we transform the problem to a first order system of ordinary differential equations(ODE's)and then define an optimization problem related to it. The new problem in modified into one consisting of the minimization of a linear functional over a set of Radon measures; the optimal measure is then approximated by a finite combination of atomic measures and the problem converted approximatly to a finite-dimensional linear programming problem. The solution to this problem is used to construct the approximate solution of the original problem. Finally we get the error functional E(we define in this paper) for the approximate solution of the ODE's problem.

• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• 제17권4호
• /
• pp.221-237
• /
• 2013

In this paper an asymptotic numerical method named as Initial Value Method (IVM) is suggested to solve the singularly perturbed weakly coupled system of reaction-diffusion type second order ordinary differential equations with negative shift (delay) terms. In this method, the original problem of solving the second order system of equations is reduced to solving eight first order singularly perturbed differential equations without delay and one system of difference equations. These singularly perturbed problems are solved by the second order hybrid finite difference scheme. An error estimate for this method is derived by using supremum norm and it is of almost second order. Numerical results are provided to illustrate the theoretical results.

• Journal of applied mathematics & informatics
• /
• 제30권1_2호
• /
• pp.305-320
• /
• 2012

In this paper, we study a class of integral boundary value problems for fractional differential equations. By using some fixed point theorems, the results of existence of at least three positive solutions for the boundary value problems are obtained.

• Journal of applied mathematics & informatics
• /
• 제35권5_6호
• /
• pp.551-563
• /
• 2017

In this paper, by using fixed point theorems in cones, the existence of positive solutions is considered for nonlinear m-point boundary value problem for the following second-order dynamic equations on time scales $$u^{{\Delta}{\nabla}}(t)+a(t)f(t,u(t))=0,\;t{\in}(0,T),\;{\beta}u(0)-{\gamma}u^{\Delta}(0)=0,\;u(T)={\sum_{i=1}^{m-2}}\;a_iu({\xi}_i),\;m{\geq}3$$, where $a(t){\in}C_{ld}((0,T),\;[0,+{\infty}))$, $f{\in}C([0,T]{\times}[0,+{\infty}),\;(-{\infty},+{\infty}))$, the nonlinear term f is allowed to change sign. We obtain several existence theorems of positive solutions for the above boundary value problems. In particular, our criteria generalize and improve some known results [15] and the obtained conditions are different from related literature [14]. As an application, an example to demonstrate our results is given.

• Journal of applied mathematics & informatics
• /
• 제27권5_6호
• /
• pp.1265-1277
• /
• 2009

In this paper, we apply a new decomposition method for solving initial and boundary value problems, which is due to Noor and Noor [18]. The analytical results are calculated in terms of convergent series with easily computable components. The diagonal Pade approximants are applied to make the work more concise and for the better understanding of the solution behavior. The proposed technique is tested on boundary layer problem; Thomas-Fermi, Blasius and sixth-order singularly perturbed Boussinesq equations. Numerical results reveal the complete reliability of the suggested scheme. This new decomposition method can be viewed as an alternative of Adomian decomposition method and homotopy perturbation methods.

• Journal of applied mathematics & informatics
• /
• 제27권5_6호
• /
• pp.1109-1118
• /
• 2009

In this paper, we are concerned with the following four point boundary value problem with one-dimensional p-Laplacian, $\{({\phi}_p(x'(t)))'+h(t)f(t,x(t),|x'(t)|)=0$, 0< t<1, $x'(0)-{\delta}x(\xi)=0,\;x'(1)+{\delta}x(\eta)=0$, where $\phi_p$ (s) = |s|$^{p-2}$, p > $\delta$ > 0, 1 > $\eta$ > $\xi$ > 0, ${\xi}+{\eta}$ = 1. By using a fixed point theorem in a cone, we obtain the existence of at least three symmetric positive solutions. The interesting point is that the boundary condition is a new Sturm-Liouville-like boundary condition, which has rarely been treated up to now.

• Journal of applied mathematics & informatics
• /
• 제28권3_4호
• /
• pp.711-721
• /
• 2010

Values of the parameter $\lambda$ are determined for which there exist positive solutions of the system of boundary value problems, $u^{(n)}+{\lambda}p(t)f(\upsilon)=0$, $\upsilon^{(n)}+{\lambda}q(t)g(u)=0$, for $t\;{\in}\;[a,b]$, and satisfying, $u^{(i)}(a)=0$, $u^{(\alpha)}(b)=0$, $\upsilon^{(i)}(a)=0$, $\upsilon^{(\alpha)}(b)=0$, for $0\;{\leq}\;i\;{\leq}\;n-2$ and $1\;{\leq}\;\alpha\;\leq\;n-1$ (but fixed). A well-known Guo-Krasnosel'skii fixed point theorem is applied.

• 대한수학회보
• /
• 제55권6호
• /
• pp.1639-1657
• /
• 2018

In this paper, we initiate the study of boundary value problems involving Hilfer fractional derivatives. Several new existence and uniqueness results are obtained by using a variety of fixed point theorems. Examples illustrating our results are also presented.

• 대한수학교육학회지:수학교육학연구
• /
• 제17권4호
• /
• pp.333-357
• /
• 2007

오늘날 수학교육에 있어서 가장 중요한 문제 중 하나는 학교수학의 인간교육적 기반을 회복하는 것이며, 이를 위해서는 '수학을 가르치는 이유는 무엇인가'라는 보다 근원적인 문제에 대한 논의가 새롭게 요구된다. 본 논문은 생활의 문제 해결이나 과학 기술을 위한 유용한 도구적 지식교육을 지향하는 오늘날 수학교육에 대한 문제 의식에서 출발한다. 먼저 '마음의 중층구조 이론에 비추어 이론적 지식 중심의 수학교육의 의미를 분석적으로 논의하고, 과거 교육사상사에서 수학교육이 어떤 인간교육적 이념을 추구해 왔는지를 Platen과 Froebel의 교육론을 통해서 살펴보았다. 그리고 20세기 초수학교육 개혁운동을 선도하여 현대의 수학교육 천학 및 수학 교육과정의 기본바탕을 제시한 F. Klein의 수학교육론을 고찰하였다. 특히 Klein의 수학교육 사상의 이면을 보다 명확히 드러내기 위하여, '마음의 중층구조'에 비추어 그의 수학교육론을 심성함양이라는 측면에서 재음미하였다. 또한 Klein의 수학교육 이념에 대한 보다 발전적인 논의를 위하여 Klein 이후 수학교육 발전과정에서 드러난 몇 가지 연구결과를 종합하여 심성함양으로서 '함수적 사고' 교육에 대한 발전적 고찰을 시도하였다. 이상과 같은 고찰을 통해 실용적 가치 추구로만 여겨졌던 오늘날의 수학 교육과정의 이면에 심성함양으로서의 인간교육적 가치가 핵심을 이루고 있으며, 수학교육은 그러한 가치 추구를 중시함으로써 심성함양에 기여해야 함을 논하였다.

• 한국수학사학회지
• /
• 제13권1호
• /
• pp.33-48
• /
• 2000

In this paper we collect the mathematical problems from the past which can be used in classroom instruction. These problems can show the cultural value and the utility of mathematics, and encourage learning and illuminate the concept being taught.