• 한국수자원학회논문집
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• 제32권1호
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• pp.61-70
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• 1999

자연하천에 유입된 오염물질의 확산거동을 해석하기 위하여 통계학적인 개념을 이용하여 오염물질 입자의 운동을 묘사하는 2차원 Random-Walk 모형을 개발하였다. 개발된 모형을 검정한 결과, 고정격자의 개수를 증가시키거나 각각의 고정격자 내에 포함된 입자개수의 평균값을 증가시키면 해의 정밀도가 증가하는 것으로 나타났다. 본 모형의 현장 적용성을 검토하기 위하여 캐나다에 위치한 Grand River에서 수행된 정상상태의 색소실험 결과와 본 모형에 의한 계산결과를 비교하였다. 그 결과 본 모형은 단면과 곡률이 불규칙하게 변하는 자연하천에서의 횡확산을 정확하게 모의하는 것으로 나타났다.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2002년도 추계학술발표대회 논문집
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• pp.71-74
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• 2002

A higher-order zig-zag theory is developed to refine the predictions of natural frequency and mode shape of laminated composite plates with multiple delaminations. By imposing top and bottom surface transverse shear stress-free and interface continuity conditions of transverse shear stresses including delaminated interfaces, the displacement field with minimal degree-of-freedoms are obtained. This displacement field can systematically handle the number, shape, size, and locations of delaminations. Through the dynamic version of variational approach, the dynamic equilibriums and variationally consistent boundary conditions are obtained. Through the numerical example of natural frequency analysis, the accuracy and efficiency of present theory are demonstrated. The present theory is suitable as an efficient tool to analyze the static and dynamic behavior of the composite plates with multiple delaminations.

• 한국학교수학회논문집
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• 제20권4호
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• pp.495-519
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• 2017

본 연구에서는 실수 e의 다양한 의미와 맥락을 살펴보고, 실수 e에 대한 예비교사들의 이해 정도를 조사하였다. 먼저 실수 e의 역사적 발생과 수학적 의미를 살펴보았으며, 이를 바탕으로 검사지를 개발하여 예비교사 28명에게 적용하고, 그 중 8명에게 반성 및 탐구 활동을 수행하였다. 실수 e에 대한 예비교사들의 이해를 분석한 결과는 다음과 같다. 상당수의 예비교사들이 실수 e의 형식적 정의와 그 표현과의 관계를 인식하지 못하였으며, 실수 e의 표현을 극한 표현에 편중되어 이해하고 있었다. 실수 e의 무리수 속성과 작도 불가능성에 대해서는 대체적으로 적절한 판단을 내렸으나, 그 근거에서는 다소 미흡한 면모를 드러내었다. 또한 실수 e의 연속 복리 맥락과 지수함수 맥락에는 높은 이해도를 나타낸 반면에, 기하적 맥락과 자연로그 맥락을 미흡하게 이해하고 있음을 확인하였다. 향후 예비교사 프로그램의 개선 방향으로, 예비교사들에게 실수 e의 다양한 표현과 속성, 맥락에 대한 학습기회를 제공하고, 실수 e의 다양한 측면이 잘 조직된 관계망 속에서 통합 지도될 필요가 있음을 제시하였다.

• 한국초등수학교육학회지
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• 제19권4호
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• pp.563-588
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• 2015

초등학교에서는 여러 가지 이유로 교수학적 변환이 불가피하다. 수학에서는 덧셈과 곱셈은 이항연산, 뺄셈과 나눗셈은 단항연산으로 다루고 있는 반면, 초등에서는 사칙연산 모두를 이항연산으로 취급하는 교수학적 변환을 시도한다. 그런데 사칙연산의 개념을 '익힌다는 것'은 개념이 어떻게 도입되는가가 더 중요하게 부각된다는 점에서 개념을 이해하는 것과는 다르다. 이에 본 연구에서는 자연수와 분수의 사칙연산을 개념 익히기(개념이 어떻게 도입되고 있는지와 연산 선택의 문제)와 연산 사이의 연결이라는 두 가지 관점으로 분석하여, 자연수와 분수의 사칙연산 지도와 관련된 몇 가지 시사점을 도출하였다. 분수의 나눗셈에서는 상황을 바탕으로 연산을 선택하지 않고 곧장 분수의 곱셈과의 연결을 시도했다는 것과 분수의 나눗셈을 그 자체로 이해하기 위해서는 5학년 2학기와 6학년 1학기에 걸쳐 제시되어 있는 분수의 나눗셈을 통합해야 한다는 것 등이 그것들이다. 이는 후속 교과서 개발 시 유용한 참고자료가 될 것으로 판단된다.

• 한국실내디자인학회논문집
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• 제22호
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• pp.123-131
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• 2000

The purpose of this study is to propose a new design concept and properties within new paradigm. Contemporary students of architectural design seem to redefine the mechanic and reductive approach to design method based upon Euclidean geometry. In this study, the organic space-time and holistic view-point that constitutes the background for all this is radically different from the modern design. It consists of three sections as follow: First, it presents a concept of complex system and properties of complexity that we find in new natural science and tries to combine that news geometry with architectural design to provide a methodological basis for morphogenesis and transformation. Second, the complexity in architecture is defined as a fractal shape, folded space, and irreducible organic system that cannot be fully understood by modernist idea of architecture. Third, the complexity in architecture is strategy based on the electronic paradigm that would enable the emergence of creative possibility. The complexity theory offer new insights to explain not only natural laws but also define dynamic architecture. In fine, this study places a great emphasis on the organic world-view to the spatial organization, which I hope will contribute to generating a greater number of creative possibilities for design.

• 교육녹색환경연구
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• 제11권1호
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• pp.23-31
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• 2012

The number of school crime has grown continuously for last ten years and its intensity also has reached to serious condition. The concept of CPTED(Crime Prevention through Environmental Design) needs to be focused for improving school environment regarding this context. The exterior space of school environment is variously exposed to school crimes committed by colleague students and also intruders. From the perspective of school CPTED, Natural surveillance as one of the practical strategies requires the micro-scale analysis which clarifies local visibility at each different school exterior space. Thus, the purpose of this research is to develop the analysis method clarifying visibility condition at exterior space of school environment, which supports finding the condition of natural surveillance. The programmed analysis algorithm generated quantitative results clarifying Degree for static visibility and Clustering Coefficient for user tracking visibility. The result of this study produced the analysis method feasible to clarify weak natural surveillance conditions at school exterior spaces. Also, it is expected that the developed analysis method will be used to improve the layout of school exterior space from the perspective of CPTED.

• 한국환경과학회지
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• 제15권5호
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• pp.461-469
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• 2006

As a frontier of Sustainable Basin Research Initiative, we commenced a scenario-driven planning and evaluation research project which is to identify the strategic policy scenarios. As a part of the project, this study attempts to estimate the ecological impacts of land cover changes using landscape indices at the whole basin level. We analyzed spatio-temporal characteristics of natural area including forest, agricultural land, water area, barren which play an important role in nature-friendly sustainable watershed management. The results of analysis shelved that the size and diversity of natural area have been reduced, while patch number and isolation have been increased in proportion to urbanization in 1974, 1995 and four future scenarios in the Ara River Basin. Also, we estimated that the natural area could be conserved to some degree in the SD or DE scenarios with a concept of environment-friendly development and lifestyle. Various strategic environment policies may be evaluated and designed on the basis of the method, that is, scenario approach and landscape ecological analysis suggested in this study.

• 한국인터넷방송통신학회논문지
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• 제11권1호
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• pp.115-123
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• 2011

본 논문에서는 배전 손실 최소화 문제에 있어서 GA의 수렴특성을 개선하기 위해서는 새로운 수명의 개념을 도입한다. 즉 개체군의 균질화와 유전적 부동의 문제에 대해서 연령을 가진 집단에 유한의 수명을 부여하여 적응도에 의한 도태외에 어느수명에 도달한 경우에도 도태시키려는 방법을 제안하였다. 이 방법은 적응도가 가장 높은 개체는 개체수의 양, 엘리트 보존전략의 영향에 의해 자손을 남기는 확률이 높은 것인데 비해 적응도가 낮은 개체는 수명에 의해 빨리 도태되고 또한 수렴성의 향상을 기대할 수 있다. 게다가 수명을 고려한 볼수 법과 이미 제안되어 있는 DPM을 조합하여 이하와 같은 특징을 가진 GA의 탐색알고리즘을 개발한다.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2018년도 추계학술대회
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• pp.21-21
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• 2018

Natural product substances have historically served as the most significant also be prepared by source of new leads for pharmaceutical development. They can chemical synthesis(both semisynthesis and total synthesis) and have played a important role in the field of organic chemistry by providing synthetic targets. Rcently, they have also been extended for commercial purpose to refer to medicinal products, health functional foods, dietary supplements and cosmetics from natural sources. A large number of currently prescribed drugs have been either directly derived from or inspired by natural products. However, with the advent of robotics, bioinformatics, high throughput screening(HTS), molecular biology-biotechnology, combinatorial chemistry, in silico(molecular modeling) and other methodologies, the pharmaceutical industry has largely moved away from plant derived natural products as a source for leads and prospective drug candidates. The strategy for natural prduct industry is now changing from drug approaches to health foods by identifying effective natural products as preparations. In Korea, a lot of development of natural product based drugs have been done, but very few on health functional foods. The concept of natural product based health foods is not active components as lead compounds but standardized extracts or preparation mixed with other medicinal plants. The representative material has been recently known to be a standardized ginseng extract "Ginsana G 115" developed by Swiss Pharmaton company. The purpose of this presentation is to underline how natural products research continues to make significant contributions in the domain of discovery and development of new health functional foods. It is proposed to present the development of high value added health food or health functional foods through scientific investigation on efficacy and standardization of new materials form natural products.

• 패션비즈니스
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• 제14권5호
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• pp.112-127
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• 2010

Primitivism is a concept that expresses and organizes natural feelings of human beings which is hard to be identified by a rigid definition. It means "staying in the beginning or the initial state, not evolving or developing, and not affected by human beings from the intact natural state". Based on this meaning, the artistic style features inherent natural beauties, as well as plain and inornate design. These features have been reflected in a variety of art pieces. The aesthetic features shown in the primitivism art pieces can be categorized into four different aspects: naturalness, folksiness, sentimentality, and humorousness. These features, influencing modern fashion, have been reinvented by a number of fashion designers. They also adopted ideas from the fancy clothes and ornaments created in carefree life style of the regions retaining their primitive cultures, such as Africa, Oceania, and Pacific coasts, and applied those ideas to various silhouette, colors, patterns, and textiles. Particularly as for textile expressions, they tried printing techniques using the patterns motivated from primitive folk symbols or the nature, applied objet of primitive materials and elaborated ornaments that represent folk and primitive feelings, and employed the primitive techniques such as knotting, crude cutting, or natural draping, to reinvent them as textile expressions in modern fashion.