• 한국도서관정보학회지
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• 제21권
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• pp.431-457
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• 1994

The aim of this thesis is to attempt a bibliographical analysis of mathematical materials that were published during Yi-Dynasty. In this study, matters that were treated concretely are the same as follows: 1. Formulation of a system about mathematical materials that were published from Three Kingdoms to Yi-Dynasty. 2. Background of each period about compilation and publication of mathematical materials. 3. Investigation to transition, block book and domain of subject of mathematical materials through analysis on each period of publication. But it was not easy to contrast materials on each catalogue with existed books one by one. In further, we must a new chance for better a n.0, ppreciation about Yi-Dynasty's mathematical materials through continuous studies to this field.

• 대한수학교육학회지:학교수학
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• 제18권1호
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• pp.159-173
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• 2016

실제 교육 현장에서는 구체적 맥락에서 추상화하는 과정과 반대로 추상화된 개념을 먼저 가르치고 구체적인 문제 상황을 도입하는 경우도 있다. 즉, 추상적 지식을 구체화 해야 하는 경우가 있는 것이다. Freudenthal은 이런 상황을 반교수학적인 전도라고 표현하며 부정적인 견해를 나타낸 바 있지만 모든 수업상황이 구체적 상황이나 구체물에서 출발하는 추상화로 진행될 수 있는지는 의문의 여지가 있다. 본 연구에서는 구체물을 추상화하여 추상적 개념을 형성하는 과정과 추상적 개념을 구체적인 상황으로 구체화하는 과정에서 나타나는 수학적 사고의 차이점을 비교 분석하여 그 교육적 시사점을 살펴보고자 한다. 이를위해 AiC의 분석틀을 활용하여 구체물의 추상화 과정에서의 수학적 사고를 분석하였고, AiC의 분석틀을 토대로 연구자가 구안한 방식으로 추상적 개념의 구체화 과정에서의 수학적 사고를 분석하였다. 두 과정을 비교 분석한 결과 구체물의 추상화 과정만큼이나 추상적 개념의 구체화 과정에서도 유의미한 수학적 사고를 유도할 수 있음을 확인할 수 있었다.

• Advances in materials Research
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• 제9권2호
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• pp.155-170
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• 2020

In this paper, using the recently introduced analytical approach for the analysis of mass and heat transfer during film growth in reactors for epitaxy from the gas phase, these processes are analyzed taking into account natural convection and the possibility of changing the rate of chemical interaction between reagents. As a result of the analysis, the conditions under which the homogeneity of the grown epitaxial layers increases with a change in the values of the parameters of the growth process are formulated.

• 충청수학회지
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• 제23권3호
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• pp.571-588
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• 2010

We introduce the Landau-de Gennes model in order to understand molecular structures in ferroelectric liquid crystals. We investigate equilibrium configurations of the governing energy functional by means of bifurcation analysis. In particular, we obtain periodic solutions of the functional, which is a signature of a rich variety of applications of ferroelectric materials.

• 소성∙가공
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• 제13권5호
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• pp.461-465
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• 2004

Based on the experimental observation, the mathematical friction model, which is an essential information for analyzing the forming process of sheet metal, is developed considering lubricant viscosity, surface roughness and hardness, punch comer radius, and punch speed. By comparing the punch load found by FEM with a proposed friction model with experimental measurement when the coated and uncoated steel sheets are formed in 2-D geometry in dry and lubricant conditions, the validity and accuracy of the developed friction model are demonstrated.

• 한국수학교육학회지시리즈A:수학교육
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• 제52권3호
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• pp.335-361
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• 2013

The purpose of this study is to analyze effects on storytelling materials of statistics in the middle school classroom lesson. For this purpose, a story is developed by the Zazkis & Liljedahl's model and applied to the 7th graders of 4 classes in a middle school. After the comparison between 5 hours of storytelling lessons and ordinary lessons, the following research findings are obtained. First, storytelling material brings a positive effect on student's academic achievement. It is also shown by the qualitative analysis that this result was caused by cognition of data observation, data transformation, and unification of data with context. Second, storytelling material brings a positive effect on student's affective attitude. It is also validated by the qualitative analysis that students show the positive change in mathematical value cognition and the interests in the lesson.

• 한국소음진동공학회논문집
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• 제23권8호
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• pp.681-689
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• 2013

The commercial tools to simulate the non-linear dynamic characteristics of wind turbine system are various but, the tool take much time to simulate the control algorithm and require many input variables. In this paper, the procedures to derive the simplified 4-degree-of-freedom mathematical model of a 2-MW wind turbine which could be used at the initial design stage of the controller are proposed based on RISO's suggested method. In this model, the 1st tower fore-after bending motion and 1st blade flapping motion are also considered in addition to the rotor-generator rotation motion in the 2-DOF model. The effectiveness of the 4-DOF model is examined comparing with the 2-DOF model and verification of the simplified model is accomplished through modal analysis for whole wind turbine system.

• Interaction and multiscale mechanics
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• 제2권2호
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• pp.109-128
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• 2009

Multiscale analysis is a stepwise procedure to obtain macro-scale material laws, directly amenable to structural analysis, based on information from finer scales. An essential ingredient of this mode of analysis is mathematical homogenization of heterogeneous materials at these scales. The purpose of this paper is to demonstrate the potential of multiscale analysis in civil engineering. The materials considered in this work are wood, shotcrete, and asphalt.

• 한국수학교육학회지시리즈A:수학교육
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• 제42권4호
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• pp.465-480
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• 2003

The main purpose of this work is to propose programs of mathematics education and mathematics history courses for the department of mathematics education of teacher training universities. Foundation of Mathematics Education, Mathematics Teaching and Learning Theories, Mathematics Problem Solving, Analysis and Evaluation of Mathematics Teaching Materials and Mathematics History are discussed in this article.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제25권1호
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• pp.79-97
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• 2011

본 연구에서는 그 동안 개발된 중등 수학영재를 위한 교수 학습자료를 최대한 수집하고, 수집한 자료들을 교수 학습 대상, 수학과 교육과정과의 관련성, 렌쥴리의 3부 심화학습 단계, 자료의 성격, 교육과정 역역 등의 5가지 유목에 대해 각 유목별로 세부영역을 두어 분류한 다음 개발 동향과 특정을 분석함으로써 앞으로 중등 수학영재를 위한 교수 학습자료를 개발할 때 발생할 수 있는 세부영역별 개발 빈도수의 편차를 줄이고 개발 자료의 질적 향상을 위한 참고자료를 제공하고자 한다.