• 대한수학교육학회지:수학교육학연구
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• 제8권1호
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• pp.351-364
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• 1998

This thesis analyzes the nature of proof in the perspective on the philosophy of mathematics. such as absolutism, quasi-empiricism and social constructivism. And this thesis searches for the improvement of teaching proof in the light of the result of those analyses of the nature of proof. Though the analyses of the nature of proof in the perspective on the philosophy of mathematics, it is revealed that proof is a dynamic reasoning process unifying the way of analytical thought and the way of synthetical thought, and plays remarkably important roles such as justification, discovery and conviction. Hence we should teach proof as a dynamic reasoning process unifying the way of analytic thought and the way of synthetic thought, avoiding the mistake of dealing with proof as a unilaterally synthetic method. At the same time, we should make students have the needs of proof in a natural way by providing them with the contexts of both justification and discovery simultaneously. Finally, we should introduce the aspect of proof that can be represented as conviction, understanding, explanation and communication to school mathematics.

• 한국학교수학회논문집
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• 제11권1호
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• pp.55-68
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• 2008

이 연구에서는 중학생들이 '원의 성질' 단원의 증명학습 과정에서 어떤 어려움을 겪는지를 조사하여 GSP를 활용한 증명학습이 학생들의 어려움을 어떻게 완화시키는지를 탐구하였다. 진단검사를 통해, 학생들은 가정과 결론의 이해, 기호의 사용, 추론 과정 등에서 어려움을 겪고 있음을 확인하였다. 한편, 학생들은 GSP를 활용한 증명학습을 통해 자신의 추측이나 추론에 대한 피드백을 받을 수 있고, 구체적인 사례를 일반화하거나 증명에 필요한 아이디어를 능동적으로 찾는 탐구 태도를 형성할 수 있다는 것을 확인하였다.

• 펄프종이기술
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• 제35권1호
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• pp.13-18
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• 2003

This study was done in an effort to evaluate the possibility of recyclability of moisture-proof paper. Because it is difficult to recycle laminated moisture-proof paper, a mixture of styrene-butadiene latex(SB latex) and wax emulsion was used as moisture-proof paper chemicals. A bar coater was applied to make moisture-proof paper and the coated weight was 17 g/$m^2$. The mixing ratios of SB latex to wax emulsion were 85 : 15, 87 : 13, and 90 : 10, respectively. It was observed that the moisture-proof paper treated with SB latex and wax emulsion at the appropriate ratio could be recycled effectively. The moisture-proof paper was similar to base paper in degree of pulping, and there was no significant difference in dispersion between moisture-proof paper and base paper. Most of wax particle which caused the spots during drying process could be removed by flotation process. Tensile strength and tear strength of handsheets made of both moisture-proof paper and base paper after pulping was measured to examine the fiber bonding and no significant difference in mechanical properties was observed.

• 펄프종이기술
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• 제33권4호
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• pp.15-20
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• 2001

The function of the moisture-proof paper is to prevent moisture from adsorbing into the packed goods. Water-vapor transmission rate of the moisture-proof paper should be less than 100g/$m^2$.24hr and the optimum rate would be less than 50g/$m^2$.24hr. In general the moisture-proof paper has been made by laminating polyethylene or polypropylene on top of the base paper. However this kind of moisture-proof paper has a problem in recycling so that it brings about environmental pollution. In general the moisture-proof paper has been made by laminating polyethylene or polypropylene on top of the base paper. However this kind of moisture-proof paper has a problem in recycling so that it brings about environmental pollution. The purpose of this paper was to make moisture-proof paper using the mixture of SB latex and wax emulsion which was recyclable and environmentally friendly. Water vapor transmission rate showed less than 50g/$m^2$.24hr in mixture ratio of 85:15, 87:13, 90:10. Especially the mixture ratio of 87:13 showed the most favorable water-vapor transmission rate. However, the moisture-proof layer was destroyed slightly by folding in packing. It has been observed that there was no close relationship between water-vapor transmission rate of the moisture-proof paper and grammage of the base paper, but the density of base paper had influenced on water vapor transmission rate. It was also observed that the moisture-proof paper could be recycled. The moisture-proof paper was similar to base paper in degree of the pulping, and there was no significant difference in dispersion between moisture-proof paper and base paper. Most of wax particles which caused the spots during drying process could be removed by flotation process. Tensile strength and tear strength of both moisture-proof paper and base paper after pulping were measured to examine the fiber bonding, and no significant difference in physical properties was observed.

• 대한수학교육학회지:수학교육학연구
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• 제20권4호
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• pp.511-528
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• 2010

기하적 성질을 이해하고 받아들이는 데 있어서 중요한 직관은 학습을 통해서도 형성될 수 있다. 본 연구는 2명의 학생을 대상으로 기호화, 문장화, 증명 과제를 수행하게 하여 기하 증명에서 기호의 중재에 의한 직관의 형성 과정을 살펴본다. 학생들에게 자명하고 당연하게 여겨지는 단정적 직관의 유무에 따라 기호가 어떤 역할을 하는지 살펴보고, 예상적 직관이 형성되지 않은 증명 문제에서 학생들이 기존 지식을 활용하여 증명을 완성하는 과정을 기호의 의미작용에 의해 설명한다. 마지막으로 피타고라스의 정리에 대해 기호의 중재에 의해서 결론적 직관이 형성되는 과정을 살펴본다.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제7권1호
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• pp.1-10
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• 2003

This research reviewed literatures on proof in mathematics education. Several views of proof can be classified (and identified) such as psychological approach (Platonism, empiricism), structural approach (logicism, formalism, intuitionism) and social approach (ontology, axiomatic systems). All these views of proof are valuable in mathematics education society. The concept of proof can be found in the form of analytic knowledge not of constructive knowledge. Human beings developed their knowledge in the sequence of constructive knowledge to analytic knowledge. Therefore, in mathematics education, the curriculum of mathematics should involve the process of cognitive knowledge development.

• 대한수학교육학회지:수학교육학연구
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• 제8권1호
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• pp.291-298
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• 1998

This study deals with the problem of proof education in the middle school geometry bby examining van Hiele#s geometric thought level theory and Freudenthal#s mathematization teaching theory. The implications that have been revealed by examining the theory of van Hie이 and Freudenthal are as follows. First of all, the proof education at present that follows the order of #definition-theorem-proof#should be reconsidered. This order of proof-teaching may have the danger that fix the proof education poorly and formally by imposing the ready-made mathematics as the mere record of proof on students rather than suggesting the proof as the real thought activity. Hence we should encourage students in reinventing #proving#as the means of organization and mathematization. Second, proof-learning can not start by introducing the term of proof only. We should recognize proof-learning as a gradual process which forms with understanding the meaning of proof on the basic of the various activities, such as observation of geometric figures, analysis of the properties of geometric figures and construction of the relationship among those properties. Moreover students should be given this natural ground of proof.

• 한국염색가공학회지
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• 제27권4호
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• pp.309-317
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• 2015

This study is the high contraction processing conditions set by the method of the CPB process. And the ultimate goal of this study is the high contraction of the CPB processing test method that can solve the problems of the high-contraction fabric processing method of the current jet dyeing machine. Non-coating process(CPB process) developed by the expression of a soft touch, light weight, functional and to develop excellent breathable nylon fabric. The nylon fabrics established the optimum processing conditions through the high contraction of the various test conditions, the CPB system.(The benzyl alcohol was used as the main constrictor.) At this time, the warp and weft contraction of nylon fabric was about 20%. And it established the constrictor concentration, the treatment temperature, time of a variety of tests. Also non-coating process(CPB process) can develop soft touch, lightweight, excellent air permeability. As a result, we developed a high contraction nylon fabric having a uniform surface. Manufactured fabric is used for Wind-proof and Down-proof.

• 대한수학교육학회지:수학교육학연구
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• 제27권2호
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• pp.191-205
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• 2017

본 연구는 서울의 C중학교 1학년 학생들이 기하 증명 문제를 해결하는 과정에서 보여주는 증명스키마 유형과 그 특징을 조사한 것이다. 자료 분석은 Harel, & Sowder의 증명스키마 유형에 기초하여 이루어졌다. 연구 결과, 학업성취수준에 따라 학생들이 사용하는 증명스키마 유형에 차이가 있었다. 상위권에서 하위권으로 갈수록 변형적 증명스키마를 사용하는 학생의 비율이 감소하였고 귀납적(측정) 증명스키마를 사용하는 학생의 비율은 증가하였다. 또한 증명과정에서 비형식적인 부호 사용하기, 문제에서 주어진 그림 특정 비율로 인식하기 등 각 증명스키마 유형마다 고유한 특징이 나타났다. 이를 바탕으로 4개의 의미 있는 결론을 추출하였고, 이것이 증명 교수 학습에 주는 시사점을 논의하였다.

• East Asian mathematical journal
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• 제31권4호
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• pp.459-481
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• 2015

In this study, we investigated whether the theorem is established even if we replace a 'square' element in the Euclidean proof of the Pythagorean theorem with different figures. At this time, we used different figures as equilateral, isosceles triangle, (mutant) a right triangle, a rectangle, a parallelogram, and any similar figures. Pythagorean theorem implies a relationship between the three sides of a right triangle. However, the procedure of Euclidean proof is discussed in relation between the areas of the square, which each edge is the length of each side of a right triangle. In this study, according to the attached figures, we found that the Pythagorean theorem appears in the following three cases, that is, the relationship between the sides, the relationship between the areas, and one case that do not appear in the previous two cases directly. In addition, we recognized the efficiency of Euclidean proof attached the square. This proving activity requires a mathematical process, and a generalization of this process is a good material that can experience the diversity and rigor at the same time.