• Korean Journal of Mathematics
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• 제26권2호
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• pp.327-335
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• 2018

In this paper, we present the construction of natural invariant measures so called SRB(Sinai-Ruelle-Bowen) measures by the properties of geometric t-potential and Bowen's equation for the hyperbolic attractors.

• East Asian mathematical journal
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• 제32권4호
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• pp.483-500
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• 2016

Ancient Greek mathematician Euclid left three books about mathematics. It's 'The elements', 'The data', 'On divisions of figure'. This study is based on the analysis of Euclid's 'On divisions of figure'. 'On divisions of figure' is a book about the construction of the shape. Because, there are thirty six proposition in 'On divisions of figure', among them 30 proposition are for the construction. In this study, based on the 'On divisions of figure' we explore the direction for construction education. The results were as follows. First, the proposition of 'On divisions of figure' shall include the following information. It is a 'proposition presented', 'heuristic approach to the construction process', 'specifically drawn presenting', 'proof process'. Therefore, the content of textbooks needs a qualitative improvement in this way. Second, a conceptual basis of 'On divisions of figure' is 'The elements'. 'The elements' includes the construction propositions 25%. However, the geometric constructions contents in middle school area is only 3%. Therefore, it is necessary to expand the learning of construction in the our country mathematics curriculum.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2007년도 춘계학술발표회 논문집
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• pp.471-474
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• 2007

On the road, geometric structure such as horizontal alignment, vortical alignment and crossing inclination ate important to explain characteristics of road and safety analysis. Especially, horizontal and vortical alignment are have to do with safety of covering. In existing road, for the safety analysis or alignment improvement and expansion pavement, it needs alignment factor of road. Alignment factor of road can be acquired by design drawing. But, design drawing can be not exist because of rack of facility management and national policy that centered to construction. And also, existing design drawing have a lot of differences in comparison with another existing design drawing cause of alignment improvement. In this case, for the precise analysis of alignment, 3-dimensional location information on the road centerline and acquisition of location information which related geometric structure are must to be preceded. In this study, therefore, it provide alignment factors which needed to alignment improvement and road safety analysis by acquisition of road space information and extraction of road centerline data using LiDAR data.

• 한국강구조학회 논문집
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• 제30권1호
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• pp.25-35
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• 2018

균일 외압을 받는 링 보강 원형단면 강재 쉘에 대하여 재료 및 기하학적 비선형 유한요소법(GMNIA)을 적용하여 외압강도를 평가하였다. 링 보강 쉘의 기하학적 초기결함의 진폭, 반경 대 두께 비, 링 보강재 간격 대 반경비 등이 외압강도에 미치는 영향을 분석하였으며, Eurocode 3과 DNV 설계기준에 의한 설계 외압 강도와 유한 요소해석으로 구한 외압강도를 비교 평가하였다. 기하학적 초기결함의 형상은 선형탄성 좌굴해석에 의한 좌굴모드를 적용하였으며 보강 쉘의 반경 대 두께 비는 250~500범위를 고려하였다.

• 한국강구조학회 논문집
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• 제13권5호
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• pp.599-608
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• 2001

STEP 하중을 받고 있는 쉘형 구조물의 동적 불안정 문제를 다룬 연구 결과는 다소 발표되고 있으나 Hybrid 케이블 돔의 동적 불안정 문제를 다룬 연구는 아직 없는 실정이다. 또 카오스의 생성을 파악하기 위하여 위상면을 이용하여 동적 좌굴의 기본적 현상을 다룬 연구도 거의 없다. 본 연구에서는 기하학적 비선형을 고려한 Hybrid 케이블 돔의 간접좌굴을 수치적 기법으로 조사하고 이를 정적 임계하중과 비교하였다. 동적 좌굴하중은 비선형 운동방정식을 수치분석하여 결정하고 위상면을 이용하여 간접좌굴 현상을 규명한다.

• 한국강구조학회 논문집
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• 제12권4호통권47호
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• pp.375-385
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• 2000

6층 비가새 및 20층 가새 철골구조물에서 기하 비선형, 재료 비선형, 접합부 비선형을 고려할 때 극한 횡하중에 대해 요구되는 접합부 연성도를 파악하였다. 재료 비선형을 고려하기 위하여 단면 모멘트-곡률 관계는 Fiber 모델을 이용하고 부재 강성행렬은 유연도 선형분포 해석모델을 이용하여 유도하였다. 강접합부를 반강접합부로 대체한 6층 구조물의 접합부 연성도는 강접합부인 경우 보다 적었고 20층 구조물에서 요구되는 반강접합부 연성도는 전단접합부의 경우와 거의 같고 강접합부는 전단접합부나 반강접합부에 비하여 큰 연성도가 필요하였다.

• 한국BIM학회 논문집
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• 제5권4호
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• pp.11-22
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• 2015

Government efforts for green growth policy initiatives demand low-carbon technologies in the road construction industry. The purpose of this paper is to develop an algorithm of a road alignment design solution for establishing the multi-dimensional information, and to calculate carbon emission quantity due to the geometric design elements in the planning phase of road alignment. The paper developed a calculation method for carbon emission quantity by drawing a speed profile reflected in the operating speed, acceleration and deceleration, which are majors factor of carbon emissions while driving and by applying a carbon emission factor. From this effort, it enabled alignment planning to reduce carbon emission. Object-based parametric design methods of the cross-sections were proposed for alignment planning, and the paper demonstrated a BIM-based road alignment planning solution. The proposed solutions can provide multi-dimensional information on carbon emission quantity and cross section elements through driving simulation. It is expected to allow construction of eco-friendly roads by deriving optimal road alignment to minimize environmental costs.

• 한국해양공학회지
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• 제22권2호
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• pp.78-84
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• 2008

As a preliminary step to build a complete superyacht hull design program, the development of superyacht profile design system is introduced. The two-dimensional hull profile is decomposed into four local zones depending upon the functionality and connecting continuity of the profile. Characteristics of each zone are investigated and used to generate the model describing the geometric shape of zone using freeform curves. A set of design parameters is derived from the established geometric model. Generation and modification of a model are is by manipulating the chosen parameters. Four zones designed are integrated to form a final profile. An interactive design system performing all the modeling and modification processes is implemented using the graphic user interface system based an Microsoft Foundation Class and OpenCASCADE, a open graphic library. The shapes of the profiles generated by the developed design system are verified with those of built superyachts. The developed design system will be used for the construction of three-dimensional superyacht hull modeling system.

• 한국강구조학회 논문집
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• 제10권4호통권37호
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• pp.779-788
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• 1998

본 논문은 강교량 부재에 번번하게 사용되는 용접상세로 비교적 낮은 피로강도를 보이는 부재에 대해 실험과 해석적 연구를 수행하였다. 측정응력을 고려해보면, 피로균열은 복부에 연결되는 거셋판의 필렛용접 지단부에서 시작하였으며, 용접단면의 기하학적 조건과 불연속성으로 인하여 집중응력이 발생하는 것으로 나타났다. 비드단면의 기하학적 형상을 고려한 FEM 모델의 해석결과와 동일한 위치에서 게이지에 의한 측정응력은 둘다 비슷한 수준의 응력집중이 용접지단부에서 발생하고 있음을 보여주고 있다. 피로실험 결과를 AASHTO와 JSSC의 피로설계기준과 비교한 결과, 80mm와 150mm 부착 시험편 모두에서 AASHTO의 D와 E등급, JSSC의 F와 G등급을 만족하거나 상회하는 것으로 나타났다. 또한, WG1와 WG3 시험편은 AASHTO와 JSSC의 S-N선도 보다 완만한 -0.3의 기울기를 갖는 것으로 나타났다.

• 한국주거학회논문집
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• 제24권6호
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• pp.93-101
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• 2013

This research purposes to understand architectural aim which the owners of buildings in the Doa-Rak-Dang block pursue through the history of family and construction. Moreover its other purpose is to find the design concepts which were selected to achieve the aim and the design elements which were applied to realize the design concepts. To accomplish the objects, it got rid of a stationary viewpoint but it approached with a dynamic viewpoint which can read the changes in the steps during various periods. Through the 100-year history of construction, the architectural aim of the Doa-Rak-Dang block is to establish the tradition of the Ok-San-Pa family to get over the social limitations of the family of a child by a concubine which began from Lee, Eun-Juk's mistress. The design concepts which were used by the owners of the Dok-Rak-Dang block to achieve the purpose are the extension of public territory and the enrichment of territoriality which have social-political, economical and symbolic means. The geometric applications such as axises and regulating lines were the design elements which were chosen to fulfill the concepts. If the establishment of the architectural aim and design concepts, the process of selecting and constructing proper design elements, and the geometric application in the process are the design principles of the Doa-Rak-Dang block, the principles can be summarized as the geometric applications of axises and regulating lines interacting as the standard of the extension of public area.