• 정보관리학회지
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• 제30권2호
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• pp.207-225
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• 2013

학문과 기술의 발달이 전개되면서 학문 간의 융합이 이루어지고 학제적 성향을 띠는 학문이 더욱 등장하게 되었다. 현재까지 계량정보학적 방법으로 학문 분야의 지적구조를 파악한 연구는 있었지만 학제적인 학문의 특성을 규명하여 지적구조를 분석한 시도는 적었다. 따라서 본 연구에서는 학제성을 띠는 의료정보학(Medical Informatics) 분야의 저널 중 IEEE ENG MED BIOL 저널을 선정하여 저자동시인용 분석과 동시출현단어 분석을 통해 본 저널의 지적구조를 파악하였다. 또한 상위 3개 대표 저널의 저자 및 MeSH Term을 추출하여 종합적으로 비교분석하였다. 이를 통해 의료정보학 분야의 융합된 학문들의 관계를 구조적으로 파악하고 의료정보학의 학문적 성향을 분석했다.

• 정보처리학회논문지A
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• 제8A권1호
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• pp.56-62
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• 2001

This paper presents a neural network based variable structure control scheme for nonlinear systems. In this scheme, a set of local variable structure control laws are designed on the basis of the linear models about preselected representative points which cover the range of the system operation of interest. From the combination of the set of local variable structure control laws, neural networks infer the approximate control input in between the operating points. The neural network based variable structure control alleviates the effects of model uncertainties, which cannot be compensated by the control techniques using feedback linearization. It also relaxes the discontinuity in the system’s behavior that appears when the control schemes based on the family of the linear models are applied to nonlinear systems. Simulation results of a ball and beam system, to which feedback linearization cannot be applied, demonstrate the feasibility of the proposed method.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2003년도 가을 학술발표회 논문집
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• pp.348-356
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• 2003

Recently, the buckling is easy to happen a thin plate and High Tensile Steel is used at the steel structure and marine structure so that it is wide. Especially, the post-buckling is becoming important design criteria in the ship structure to use especially the High Tensile Steel. Consequently, it is important that we grasp the conduct post-buckling behaviour accurately at the stability of the ship structure or marine structure. In this study, examined closely about conduct and snap-through behaviour after initial buckling of thin plate structure which apply compressive load according to various kinds initial deflection shape under all edges simply supported condition that make by buckling formula in each payment in advance rule to place which is representative construction of hull. Analysis method is F.E.M in used ANSYS program and complicated nonlinear behaviour to analyze such as secondary buckling with snap-through behaviour. Nonlinear buckling control is applied between newton-raphson method and arc-length method in this study

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2002년도 종합학술발표회 논문집 Vol.12 No.1
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• pp.259-262
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• 2002

The problems of electromagnetic coupling and radiation in an aperture-coupled microstrip antenna structure are discussed while focusing on the difference between two representative field configuration: parasitic-type and cavity-type. Based on the discussion, a critical look is taken at the validity of a previous description of the coupling mechanism of m aperture-coupled microstrip antenna.

• 한국CDE학회논문집
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• 제5권4호
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• pp.293-300
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• 2000

The non-manifold geometric modeling technique is to improve design process and to Integrate design, analysis, and manufacturing by handling mixture of wireframe model, surface model, and solid model in a single data structure. For the non-manifold geometric modeling, Euler operators and other high level modeling methods are necessary. Boolean operation is one of the representative modeling method for the non-manifold geometric modeling. This thesis studies Boolean operations of non-manifold model with the data structure of selective storage. The data structure of selective storage is improved non-manifold data structure in that existing non-manifold data structures using ordered topological representation method always store non-manifold information even if edges and vortices are in the manifold situation. To implement Boolean operations for non-manifold model, intersection algorithm for topological cells of three different dimensions, merging and selection algorithm for three dimensional model, and Open Inventor(tm), a 3D toolkit from SGI, are used.

• Computers and Concrete
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• 제7권5호
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• pp.469-482
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• 2010

This paper investigates the concrete permeability through a numerical and statistical approach. Concrete is considered as a random heterogeneous composite of three phases: aggregates, interfacial transition zones (ITZ) and matrix. The paper begins with some classical bound and estimate theories applied to concrete permeability and the influence of ITZ on these bound and estimate values is discussed. Numerical samples for permeability analysis are established through random aggregate structure (RAS) scheme, each numerical sample containing randomly distributed aggregates coated with ITZ and dispersed in a homogeneous matrix. The volumetric fraction of aggregates is fixed and the size distribution of aggregates observes Fuller's curve. Then finite element method is used to solve the steady permeation problem on 2D numerical samples and the overall permeability is deduced from flux-pressure relation. The impact of ITZ on overall permeability is analyzed in terms of ITZ width and contrast ratio between ITZ and matrix permeabilities. Hereafter, 3680 samples are generated for 23 sample sizes and 4 contrast ratios, and statistical analysis is performed on the permeability dispersion in terms of sample size and ITZ characteristics. By sample theory, the size of representative volume element (RVE) for permeability is then quantified considering sample realization number and expected error. Concluding remarks are provided for the impact of ITZ on concrete permeability and its statistical characteristics.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2002년도 추계 학술발표회 논문집
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• pp.83-90
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• 2002

There are few earthquake records in Korea and the Japanese or American representative earthquake records have been generally used in the seismic design. In this study, some earthquake records which the range of earthquake magnitudes varies from 5.3 to 7.9 were collected and analyzed to assess which record can rationally reflect Korean seismic characteristics. In this assessment, each seismic energy and acceleration spectrum were analyzed with the unified maximum ground acceleration. Several numerical analyses on Korean representative caisson structures were also carried out to compare each dynamic displacement. In these numerical analyses, soil conditions and the dimension of structure such as height and width were changed. Through this assessment, it is found that the compatible earthquake magnitude in Korea is lower than 7. From the result of numerical analyses, it is shown that horizontal dynamic displacements corresponding to earthquake magnitudes over than 7 are quite larger than those below earthquake magnitude 7. Based on this study, it is necessary that Korean seismic design guideline will refer earthquake magnitude criteria for the construction of the economical aseismic structure.

• Structural Engineering and Mechanics
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• 제55권2호
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• pp.315-334
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• 2015

This study's primary aim is to check the existence of a representative volume element for granular materials and determine the link between the properties (responses) of macro structures and the size of the discrete particle assembly used to represent a constitutive relation in a two-scale model. In our two-scale method the boundary value problem on the macro level was solved using finite element method, based on the Cosserat continuum; the macro stresses and modulus were obtained using a solution of discrete particle assemblies at certain element integration points. Meanwhile, discrete particle assemblies were solved using discrete element method under boundary conditions provided by the macro deformation. Our investigations focused largely on the size effects of the discrete particle assembly and the radius of the particle on macro properties, such as deformation stiffness, bearing capacity and the residual strength of the granular structure. According to the numerical results, we suggest fitting formulas linking the values of different macro properties (responses) and size of discrete particle assemblies. In addition, this study also concerns the configuration and displacement fluctuation of discrete particle assemblies on the micro level, accompanied with the evolution of bearing capacity and deformation on the macro level.

• 터널과지하공간
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• 제27권5호
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• pp.333-342
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• 2017

본 연구에서는 국내의 다양한 화성암에 대해 내부구조의 불균질성을 정량화하고, 이와 탄성파속도 및 점하중강도간의 상관관계를 분석하였다. 3차원 X-ray Computed Tomography(CT)를 통해 암석 시편 내부 구조에 대한 정보를 획득하였으며, 3차원 영상에 통계적 기법을 적용하여 뷸균질성 대표계수(representative unit length, LR)를 계산하였다. 또한 암석의 탄성파 속도 및 점하중강도와 LR간의 상관관계로부터 암석의 역학적 특성치를 예측하는 추정식을 제안하였다. 본 연구에서 제안한 방법을 통해 3차원 X-ray 영상에 기반한 내부 특성 분석값을 이용해 실내실험을 수행하지 않고도 암석의 역학적 물성을 평가할 수 있는 간접적인 인자를 도출할 수 있는 가능성을 확인하였다.

• 한국콘텐츠학회논문지
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• 제13권2호
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• pp.100-107
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• 2013

아네스 바르다는 자신만의 영화세계를 구축해 온 프랑스의 대표적인 여성 영화감독이다. 특히 주관성과 객관성을 혼합하는 실험적인 방식은 가장 돋보이는 특성이다. 이를 뒷받침하는 방식은 고전적 영화 방식과 상이한 영화적 형식에 대한 탐구에서 비롯한다. 이러한 접근은 현대영화의 형식을 치밀하게 분석하여 구조를 발견하는 노엘 버치의 방법론과 같다. 그래서 아네스 바르다의 대표작 중 하나이면서 1985년 베니스영화제에서 황금사자상을 수상한 바 있는 <방랑자>를 대상으로 주제와 형식의 유기적 결합을 통한 현대영화의 구조 산출이라는 형식미학적 분석하고자 한다. 인간 사이의 관계성과 접촉의 회복을 표류하는 삶의 비극적 죽음을 통해 전달하고자 한 영화의 주제는 영화의 형식적 실험을 통해 새로운 영화적 구조를 낳았다. 그 형식적 실험은 영화의 도입부의 보이스오버와 파편적이고 반복적인 구성으로서 인물과 상황 제시 방식, 서사적 양식과 비서사적 양식의 배합, 그리고 영화적 물리적 질료성을 폭로하는 방식으로서 카메라의 움직임과 편집, 그리고 플래쉬백과 사운드의 독특한 사용으로 이루어져있다.