• 한국수학교육학회지시리즈A:수학교육
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• 제44권1호
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• pp.15-40
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• 2005

This study basically investigates the meaning and properties of performance task applicable to mathematics classroom and it finds out how to run effectively performance task activities included in the present mathematics textbooks. To accomplish this, this study deals with twelves kinds of mathematics textbooks for ninth graders and is proceeded on the basis of textbook analysis and teacher interview. Considering a situation that in future mathematics textbook would be developed, according to the analytic results of this study, common understanding of performance task and qualified performance task are needed, a variety of tasks classified by differentiated level are needed. In addition, each task should be dealt with the contents related to curious and interesting real-life situations. Furthermore, fairness of checking and recording should be established and teachers' positive attitudes to applying performance tasks to math class are needed.

• 한국수학교육학회지시리즈A:수학교육
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• 제23권1호
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• pp.53-65
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• 1984

Teachers need to provide a variety of learning experiences for pupils in elementary school mathematics. This is necessary due to pupils (a) achieving at diverse levels of accomplishment in the mathematics curriculum. (b) individually possessing different learning styles. The following, among others, can be relevant learning activities to present to pupils: 1. using a selected series of elementary school mathematics textbooks. 2. utilizing the flannel board to guide individual pupil achievement in mathematics. 3. helping pupils attach meaning to learning through the use of markers. 1. guiding pupils in learning by using place value charts. 5. aiding learner achievement through the use of transparencies and the overhead projector. 6. stimulating learner interest in mathematics with the use of selected filmstrips. 7. using graphs in functional situations. 8. helping young pupils to develop interest in numbers by singing songs directly related to ongoing units of study in elementary school mathematics. 9. using the geoboard to help pupils experience the world of geometry. 10. providing drill and practice for pupils so that previous developed learnings will not be forgotten.

• 대한수학교육학회지:학교수학
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• 제1권2호
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• pp.433-449
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• 1999

This paper introduces a branch of qualitative method, called an in-depth interview method. By collecting data from the stories of Korean middle school students and a 9th grade American girl who used Geometer's Sketchpad and various software respectively for their mathematical problem solving, the qualitative analysis leads us to understand how such software affect their lives with mathematics subject. The unique characteristics and strands of each student's utterances reflect how software plays a role of learning aid for their mathematics learning. The arm of this study is both to get a good picture of each student's self-perceived relationship to mathematics as well as to explore external and objective parameters and factors in each student's internal situations. The qualitative descriptions of the collected data help us guide the students to the points where they could develop their interests and satisfaction with subject matter better. In this way, teachers may have more realistic understandings of how students become interested and motivated by mathematics, so that they are better able to find out ways of grasping the totalities of how the use of technology is interwoven into the school curricular.

• 대한수학교육학회지:수학교육학연구
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• 제12권4호
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• pp.523-542
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• 2002

The matter of understanding mathematical concepts in learning mathematics is one of the most important issues in mathematics education. There have been so many studies about it but the more practical study has been asked. When we Think using intuitional models such as examples, figures of speech, situations and activities, it is supposed that the major elements of cognitive mechanism are prototypes, analogies, metaphors and metonymies. In this paper, we tried to examine Rosch's prototype theory, the studies about analogies in congnitive psychology, Lakoff and Johnson's metaphor theory from the viewpoint of teaching mathematics, and then tried to analyze examples, analogies, analogical transfers, metaphorical expressions, metonymies in middle school mathematics text books used in Korea now.

• 대한수학교육학회지:수학교육학연구
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• 제11권2호
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• pp.363-384
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• 2001

The purpose of this thesis is, through analysing the characteristics of the definitions in Korean school mathematics textbooks, to explore the levels of them and to make suggestions for definition - teaching as a mathematising activity, Definitions used in academic mathematics are rigorous. But they should be transformed into various types, which are presented in school mathematics textbooks, with didactical purposes. In this thesis we investigated such types of transformation. With the result of this investigation we tried to identify the levels of the definitions in school mathematics textbooks. And in school mathematics textbooks there are definitions which carry out special functions in mathematical contexts or situations. We can say that we understand those definitions, only if we also understand the functions of definitions in those contexts or situations. In this thesis we investigated the cases in school mathematics textbooks, when such functions of definition are accompanied. With the result of this investigation we tried to make suggestions for definition-teaching as an intellectual activity. To begin with we considered definition from two aspects, methods of definition and functions of definition. We tried to construct, with consideration about methods of definition, frame for analysing the types of the definitions in school mathematics and search for a method for definition-teaching through mathematization. Methods of definition are classified as connotative method, denotative method, and synonymous method. Especially we identified that connotative method contains logical definition, genetic definition, relational definition, operational definition, and axiomatic definition. Functions of definition are classified as, description-function, stipulation-function, discrimination-function, analysis-function, demonstration-function, improvement-function. With these analyses we made a frame for investigating the characteristics of the definitions in school mathematics textbooks. With this frame we identified concrete types of transformations of methods of definition. We tried to analyse this result with van Hieles' theory about levels of geometry learning and the mathematical language levels described by Freudenthal, and identify the levels of definitions in school mathematics. We showed the levels of definitions in the geometry area of the Korean school mathematics. And as a result of analysing functions of definition we found that functions of definition appear more often in geometry than in algebra or analysis and that improvement-function, demonstration-function appear regularly after demonstrative geometry while other functions appear before demonstrative geometry. Also, we found that generally speaking, the functions of definition are not explained adequately in school mathematics textbooks. So it is required that the textbook authors should be careful not to miss an opportunity for the functional understanding. And the mathematics teachers should be aware of the functions of definitions. As mentioned above, in this thesis we analysed definitions in school mathematics, identified various types of didactical transformations of definitions, and presented a basis for future researches on definition teaching in school mathematics.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제23권3호
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• pp.523-543
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• 2009

수학 교육과 학업의 결과인 수학 학업성취도에 영향을 미치는 주요 변인을 탐색하고 분석하기 위하여 부산의 2개 중학교와 경남의 2개 중학교에 재학 중인 총 484명의 중학교 2학년들을 대상으로 학생들의 가정환경 및 배경, 학생 개인의 성격 및 교우관계, 수학문제 해결을 위한 학습습관, 수업방식과 교사와 관련된 변인, 컴퓨터의 활용도, 수준별 이동수업 등의 학교환경, 사교육의 실태 등을 조사한 설문지를 평가도구로 활용한다. 그리고 최근 주목을 받고 있는 사교육 현황을 지역별로 비교하여 제시한다. 설문자료를 활용하여 통계적 기법인 요인분석을 실행하여 수학 학업성취도에 영향을 미치는 배경변인들을 분석하고 그들의 특징을 제시하여 수학교육 연구자와 중등수학교사들에게 중등수학교육의 질 향상에 기여할 수 있는 기초자료를 제공하며 중등수학교육의 시사점을 제시하고자 한다.

• 한국지능시스템학회논문지
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• 제15권4호
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• pp.511-513
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• 2005

We investigate some situations in connection with two exact sequences of fuzzy linear maps.

• 한국초등수학교육학회지
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• 제19권3호
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• pp.409-434
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• 2015

본 연구의 목적은 초등학교 학생들에게 수학 교육에서의 사회정의를 가르치기 위한 수학 수업 사례 연구로 이를 적용한 수학 수업을 통해 학생들의 사회정의를 위한 수학에 대한 이해를 돕는데 있다. 그리고 학생들로 하여금 사회의 불평등 문제 상황을 비판적으로 바라보도록 함으로써 보다 정의로운 사회를 만들기 위한 수학 수업에서 학생들의 수학에 대한 흥미와 가치 인식이 어떻게 변하는지 알아보는데 있다. 본 연구를 위해 서울특별시 서초구에 소재한 B초등학교 6학년 학생 18명(남 13명, 여 5명)의 학생들과 방과 후 동아리 수업 시간을 활용하여 8개 주제에 대하여 10차시의 수업을 진행하였다. 자료 수집 및 분석은 수업 중 활동의 관찰 및 학생들의 담화, 활동지, 설문, 인터뷰를 통하여 사회정의 이해, 수학에 대한 흥미, 수학에 대한 가치 인식에 대하여 알아보았다. 연구 결과 학생들은 사회정의를 위한 수학 수업의 과정에서 삶의 문제에 대하여 사회정의의 관점으로 재인식하게 되면서 비정의의 문제를 해결하기 위한 실천 의지를 기르거나 직접 실행에 옮기며 적극적인 사회적 행동을 표현하는 모습을 보여 주었다. 또한 학생들은 자신들에게 친숙하고 밀접한 사회적 맥락 관계에 있는 학습 과제를 해결하는 과정을 통해'수학에 대한 흥미'가 높아졌으며, 세계를 이해하고 잠재적으로 변화를 이끌어낼 수 있는 실생활에 필수적인 학문으로서'수학에 대한 가치'인식도 높아졌다. 사회정의를 위한 수학 수업이 학교 교육에서 정착되기 위해서는 사회정의를 위한 교육의 필요성을 인식할 필요가 있으며, 교사들의 사회정의에 대한 이해를 보다 깊게 할 필요가 있고, 질 높은 관련 자료의 개발과 현장에서의 적용 그리고 현장의 수업사례를 기반으로 한 교사 교육을 지속적으로 해 갈 필요가 있다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1994년도 Proceedings of the Korea Automatic Control Conference, 9th (KACC) ; Taejeon, Korea; 17-20 Oct. 1994
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• pp.747-752
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• 1994

Ussing's flux ratio theorem (1978) reflects a reciprocal relationship behavior between the unidirectional fluxes in asymmetric steady diffusion-convection in a membrane slab. This surprising result has led to many subsequent studies in a wide range of applications, in particular involving linear models of time dependent problems in biology and physiology. Ussing's theorem and its extensions are inherently linear in character. It is of considerable interest to ask to what extent these results apply, if at all, in situations involving, for example, nonlinear reaction. A physiologically interesting situation has been considered by Weisiger et at. (1989, 1991, 1992) and by McNabb et al. (1990, 1991) who studied the role of albumin in the transport of ligands across aqueous diffusion barriers in a liver membrane slab. The results are that there exist reciprocal relationships between unidirectional fluxes in the steady state, although albumin is chemically interacting in a nonlinear way of the diffusion processes. However, the results do not hold in general at early times. Since this type of study first started, it has been speculated about when and how the Ussing's flux ratio theorem fails in a general diffusion-convection-reaction system. In this paper we discuss the validity of Ussing-type theorems in time-dependent situations, and consider the limiting time behavior of a general nonlinear diffusion system with interaction.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제20권1호
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• pp.83-106
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• 2016

This paper reviews and compares three different methods for modeling incompressible and immiscible ternary fluid flows: the immersed boundary, level set, and phase-field methods. The immersed boundary method represents the moving interface by tracking the Lagrangian particles. In the level set method, an interface is defined implicitly by using the signed distance function, and its evolution is governed by a transport equation. In the phase-field method, the advective Cahn-Hilliard equation is used as the evolution equation, and its order parameter also implicitly defines an interface. Each method has its merits and demerits. We perform the several simulations under different conditions to examine the merits and demerits of each method. Based on the results, we determine the most suitable method depending on the specific modeling needs of different situations.