• Journal of applied mathematics & informatics
• /
• 제4권2호
• /
• pp.457-468
• /
• 1997

The present paper deals with an economic order quan-tity model for items deteriorating at some constant rate with demand changing at a known and at a random point of time in the fixed pro-duction cycle.

• Journal of applied mathematics & informatics
• /
• 제26권1_2호
• /
• pp.29-44
• /
• 2008

By employing the continuation theorem of coincidence degree theory, we derive a sufficient condition for the existence and attractricity of a positive periodic solution for a generalized predator-prey model with diffussion feedback controls.

• Journal of applied mathematics & informatics
• /
• 제30권3_4호
• /
• pp.489-498
• /
• 2012

Most of the software reliability models are based on black box approach and these models consider the entire software system as a single unit. Present day software development process has changed a lot. In present scenario these models may not give better results. To overcome this problem an improved additive model has been proposed in this paper, to estimate the reliability of software with modular structure. Also the concept of imperfect debugging has been also considered. A maximum likelihood estimation technique has been used for estimating the model parameters. Comparison has been made with an existing model. ${\chi}^2$ goodness of fit has been used for model fitting. The proposed model has been validated using real data.

• Journal of applied mathematics & informatics
• /
• 제29권3_4호
• /
• pp.781-802
• /
• 2011

Of concern in the paper is a Holling-Tanner predator-prey model with modified version of the Leslie-Gower functional response. Dynamical behaviours such as stability, permanence and Hopf bifurcation have been carried out deterministically. Using the normal form theory and center manifold theorem, the explicit formulae determining the stability and direction of Hopf bifurcation have been derived. The deterministic model is extended to a stochastic one by perturbing the growth equation of prey and predator by white and colored noises and finally the mean square stability of the stochastic model systems is investigated analytically. An extensive quantitative analysis has been performed based on numerical computation so as to validate the applicability of the proposed mathematical model.

• 한국수학교육학회지시리즈D:수학교육연구
• /
• 제1권2호
• /
• pp.107-116
• /
• 1997

The purpose of this study is to develop a teaching/learning model for the mathematical enculturation of elementary and secondary school students. It is clear that the development of teaching and learning in the classroom is essential for the realization of global innovations in mathematics education. Research questions for this purpose are as follow: (1) What can be learned from literatures reviews of the socio-cultural perspective on mathematics education, and of ethnomathematics as a mathematics intrinsic to cultural activities? (2) What is the direction of teaching and learning from the perspective of mathematical enculturation? (3) What is the teaching /learning model for mathematical enculturation? (4) What is the instructional exemplification based on the developed model? This study promotes the establishment of mathematics education theory from the review of literatures on the socio-cultural perspective, the development of a teaching/learning model, and the instructional exemplification based on the developed model.

• 한국수학교육학회지시리즈E:수학교육논문집
• /
• 제34권4호
• /
• pp.587-603
• /
• 2020

본 연구는 수학교육에서 중요한 수단이자 교육적 도구인 수학체험교구를 체계적으로 개발하기 위한 기초연구이다. 최근 활동이론(action theory)에 근거한 수학교육이 강조되면서 다양한 수학체험교구가 개발되고 교육현장에서 다양한 비교과활동을 통해 활용되고 있지만, 실제 수학수업에서 개념을 설명하기 위한 도구로 수학체험교구가 개발되어 활용되는 사례는 부족한 실정이다. 특히, 수학과 교육과정에 부합되고, 수학적 근거가 명확한 체험교구는 체계적으로 개발되지 못하고 있다. 이에 본 연구에서는 수학체험교구를 개발하기 위한 체계적인 방법으로 체험교구 개발 모형을 제안한다. 또한 제안한 개발 모형에 따라 최대공약수 체험교구를 개발하였다. 본 연구를 통해 제안된 모형과 실제 구현된 체험교구를 통해 다양한 수학체험교구의 개발이 실제적으로 실행되고, 수학적 기초에 근거한 수학체험교구가 다양하게 개발될 것으로 기대된다.

• Journal of applied mathematics & informatics
• /
• 제42권4호
• /
• pp.945-968
• /
• 2024

This study focuses on SIR model for SARS-CoV-2. The SIR model classifies a population into three compartments: susceptible S(t), infected I(t), and recovered R(t) individuals. The SARS-CoV-2 model considers various factors, such as immigration, birth rate, death rate, contact rate, recovery rate, and interactions between infected and healthy individuals to explore their impact on population dynamics during the pandemic. To analyze this model, we employed two powerful semi-analytical methods: the Laplace Adomian decomposition method (LADM) and the differential transform method (DTM). Both techniques demonstrated their efficacy by providing highly accurate approximate solutions with minimal iterations. Furthermore, to gain a comprehensive understanding of the system behavior, we conducted a comparison with the numerical simulations. This comparative analysis enabled us to validate the results and to gain valuable understanding of the responses of SARS-CoV-2 model across different scenarios.

• 한국수학사학회지
• /
• 제15권2호
• /
• pp.113-124
• /
• 2002

The main purpose of this study is to classify types of class using computer in the school mathematics classroom. For this purpose, we will first survey the Tyle's theory relate to the curriculum model and its details. Then we will investigate the crucial points using computer in the school mathematics classroom in the viewpoint of Glaser's teaching model. From this, we will device several types of mathematics class using computer.

• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• 제25권4호
• /
• pp.312-326
• /
• 2021

The prey-predator model is one of the most influential mathematical models in ecology and evolutionary biology. In this study, we considered a modified prey-predator model, which describes the rate of change for each species. The effects of modifications to the classical prey-predator model are investigated here. The conditions required for the existence of the first integral and the stability of the fixed points are studied. In particular, it is shown that the first integral exists only for a subset of the model parameters, and the phase portraits around the fixed points exhibit physically relevant phenomena over a wide range of the parameter space. The results show that adding coupling terms to the classical model widely expands the dynamics with great potential for applicability in real-world phenomena.

• Journal of applied mathematics & informatics
• /
• 제6권2호
• /
• pp.589-598
• /
• 1999

Classification errors are included in sampling -with -re-placement model where items are sampled from a Bernoulli process. Bayesian imperfect inspection model is considered. In addition con-jugate prior and predctive densities for imperfect inspection model are obtained.