• 한국수학교육학회지시리즈D:수학교육연구
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• 제15권4호
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• pp.311-325
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• 2011

In this paper I propose that teaching students the most efficient method of problem solving may curtail students' creativity. Instead it is important to arm students with a variety of problem solving heuristics. It is the students' responsibility to decide which heuristic will solve the problem. The chosen heuristic is the one which is meaningful to the students.

• 대한수학교육학회지:학교수학
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• 제14권4호
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• pp.445-468
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• 2012

본 연구는 산술적 바탕 위에 있는 학생들이 형식적인 대수 추론으로 자연스럽게 이행하는 것을 돕고자, 초등학생들이 대수 문제를 접하였을 때 사용하는 대수 추론 전략을 조사하였다. 총 839명을 대상으로 초등학생의 대수 추론 방법을 조사한 결과, 초등학생들이 연립 일차방정식과 관련된 문장제의 해결에서 기존의 교과서에 제시된 방법 이외의 다양한 산술적 추론과 전형식적 대수 추론을 사용하는 것이 파악되었다. 또한, 대수 문제의 구조에 따라 학생들이 사용하는 추론 전략의 차이가 있음을 밝혔으며, 학생들의 대수 문제해결에서 나타나는 추론상의 오류의 원인을 분석하였다. 특히, 초등학생들이 사용하는'양적 추론'과 '비례적 추론'과 같은 전략들은 비형식적인 대입법, 이항법임을 밝혔다. 마지막으로, 이러한 전형식적 대수 추론들을 형식적 대수 추론으로 연결할 수 있는 가능성에 대하여 논의하였다.

• 한국수학교육학회지시리즈A:수학교육
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• 제58권1호
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• pp.79-99
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• 2019

This study is a study to collect information about 'Limitations of functions' related learning. Especially, this study was conducted on three students who can find answers by algebraic procedure in the process of extreme problem solving. Students have had the experience of converting from their algebraic procedures to graphical expressions. This shows how they reflect on their algebraic procedures. This study is a study that observes these parts. To accomplish this, twelfth were teaching experiment in three high school students. And we analyzed the contents related to the research topic of this study. Through this, students showed the difference of expressions in the method of finding limits by using algebraic interpretation methods and graphs. In addition, we examined the connectivity of the limitations of functions problem solving process of functions using algebraic procedures and graphs in the process of converting algebraic expressions to graph expressions. This study is a study of how students construct limit concepts. As in this study, it is meaningful to accumulate practical information about students' limit conceptual composition. We hope that this study will help students to study limit concept development process for students who have no limit learning experience in the future.

• East Asian mathematical journal
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• 제37권4호
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• pp.401-426
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• 2021

In order to propose ways to implement mathematical connection between algebra and geometry, this study reinterpreted and visualized the Khayyam's geometric method solving the cubic equations using two conic sections and the Al-Kāshi's method of constructing of angle trisection using a cubic equation. Khayyam's method is an example of a geometric solution to an algebraic problem, while Al-Kāshi's method is an example of an algebraic a solution to a geometric problem. The construction and property of conics were presented deductively by the theorem of "Stoicheia" and the Apollonius' symptoms contained in "Conics". In addition, I consider connections that emerged in the alternating process of algebra and geometry and present meaningful Implications for instruction method on mathematical connection.

• 대한수학회지
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• 제49권1호
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• pp.99-112
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• 2012

This paper attempts to present a numerical method for solving optimal control problems. The method is based upon constructing the n-th degree Jacobi polynomials to approximate the control vector and use differentiation matrix to approximate derivative term in the state system. The system dynamics are then converted into system of algebraic equations and hence the optimal control problem is reduced to constrained optimization problem. Numerical examples illustrate the robustness, accuracy and efficiency of the proposed method.

• 한국소음진동공학회논문집
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• 제19권6호
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• pp.607-613
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• 2009

A new formulation of NDIF method to the algebraic eigenvalue problem is introduced to efficiently extract natural frequencies of arbitrarily shaped plates with the simply supported boundary condition. NDIF method, which was developed by the authors for the free vibration analysis of arbitrarily shaped membranes and plates, has the feature that it yields highly accurate natural frequencies compared with other analytical methods or numerical methods(FEM and BEM). However, NDIF method has the weak point that it needs the inefficient procedure of searching natural frequencies by plotting the values of the determinant of a system matrix in the frequency range of interest. A new formulation of NDIF method developed in the paper doesn't require the above inefficient procedure and natural frequencies can be efficiently obtained by solving the typical algebraic eigenvalue problem. Finally, the validity of the proposed method is shown in several case studies, which indicate that natural frequencies by the proposed method are very accurate compared to other exact, analytical, or numerical methods.

• 한국수학사학회지
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• 제15권2호
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• pp.49-68
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• 2002

One of the characteristics of modem mathematics is to use algebra in every fields of mathematics. But we don't have the exact definition of algebra, and we can't clearly define algebraic thinking. In order to solve this problem, this paper investigate the history of algebra. First, we describe some of the features of proportional Babylonian thinking by analysing some problems. In chapter 4, we consider Greek's analytical method and proportional theory. And in chapter 5, we deal with Diophantus' algebraic method by giving an overview of Arithmetica. Finally we investigate Viete's thinking of algebra through his ‘the analytical art’. By investigating these history of algebra, we reach the following conclusions. 1. The origin of algebra comes from problem solving(various equations). 2. The origin of algebraic thinking is the proportional thinking and the analytical thinking. 3. The thing that plays an important role in transition from arithmetical thinking to algebraic thinking is Babylonian ‘the false value’ idea and Diophantus’ ‘arithmos’ concept.

• 한국수학사학회지
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• 제17권3호
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• pp.93-108
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• 2004

본 연구에서는 슈타이너$.$레무스(Steiner-Lehmus) 정리에 대한 다양한 증명을 찾아 이들 증명에 사용된 수학적 개념, 정리, 방법들을 고찰하며, 몇 가지 증명에 대해서는 기존의 기술 방법을 개선한 좀더 구체적인 형태로 기술하였다. 이를 통해, 이등변삼각형의 흥미로운 성질인 슈타이너$.$레무스 정리에 대한 다양한 증명 방법을 밝히고, 중등학교 수학교육의 질적이고 양적인 확장을 위한 기초 자료를 제공할 것이다.

• 한국학교수학회논문집
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• 제11권3호
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• pp.399-420
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• 2008

작도문제는 도형의 다양한 개념들, 성질들에 대한 이해를 증진시키며, 기하학적 탐구능력을 기르는 도구로 활용될 수 있다. 본 연구에서는 작도문제를 해결하는 대수적 방법의 본질, 의의에 대해 고찰하고, 대수적 방법을 활용하여 방접원의 반지름(들)이 조건의 일부로 주어진 삼각형 작도문제를 해결하고, 바탕문제를 중심으로 해결된 작도 문제를 체계화시켰다. 본 연구의 결과는 수학 심화학급이나 과학영재교육원의 창의적 수학 탐구의 자료로 활용될 수 있을 것이며, 삼각형 작도문제의 체계적이고 포괄적인 후속연구를 위한 기초자료가 될 수 있을 것으로 기대된다.

• Coupled systems mechanics
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• 제1권4호
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• pp.345-360
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• 2012

In this article we have presented a unique representation for interval arithmetic. The traditional interval arithmetic is transformed into crisp by symbolic parameterization. Then the proposed interval arithmetic is extended for fuzzy numbers and this fuzzy arithmetic is used as a tool for uncertain finite element method. In general, the fuzzy finite element converts the governing differential equations into fuzzy algebraic equations. Fuzzy algebraic equations either give a fuzzy eigenvalue problem or a fuzzy system of linear equations. The proposed methods have been used to solve a test problem namely heat conduction problem along with fuzzy finite element method to see the efficacy and powerfulness of the methodology. As such a coupled set of fuzzy linear equations are obtained. These coupled fuzzy linear equations have been solved by two techniques such as by fuzzy iteration method and fuzzy eigenvalue method. Obtained results are compared and it has seen that the proposed methods are reliable and may be applicable to other heat conduction problems too.