• Spatial Information Research
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• 제1권1호
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• pp.89-94
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• 1993

지질재해(산사태)를 분석하기 위한 광역지질재해도가 GIS를 이용하여 작성되었다. 산사태를 일으키는 주요 요소인 지형경사, 파괴사면형태, 공극수압, 토성, 지질, 강우량등이 GIS기법을 이용하여 정량적으로 분석되었으며, 컴퓨터 지도모형연구를 통하여 작성된 최중 지질재해도는 연구지역의 산사태 잠재력과 지면의 안정성을 아주 효과적, 경제적으로 분석할 수 있다. 이러한 GIS MAP들은 대상지역의 지역개발 정책뿐만 아니라 자연재해 예방등에 아주 유용하게 이용될 수 있다. 금번연구를 위하여 사용된 GIS시스템은 ARC/INFO이며, 영상처리를 위하여는 ERDAS가 활용되었다.

• 한국공간구조학회논문집
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• 제14권2호
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• pp.59-68
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• 2014

A study on the vibration and buckling analyses of laminated composite plates is described in this paper. In order to carry out the analyses of laminated composite plates, a NURBS-based isogeometric general plate element based on Reissner-Mindlin (RM) theory is developed. The non-uniform rational B-spline (NURBS) is used to represent the geometry of plate and the unknown displacement field and therefore, all terms required in this element formulation are consistently derived by using NURBS basis function. Numerical examples are conducted to investigate the accuracy and reliability of the present plate element. From numerical results, the present plate element can produce the isogeometric solutions with sufficient accuracy. Finally, the present isogeometric solutions are provided as future reference solutions.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1996년도 춘계학술발표회논문집(1)
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• pp.34-39
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• 1996

A consistent general order nodal method for solving the 3-D neutron diffusion equation in (x-y-z) geometry has ben derived by using a weighted integral technique and expanding the spatial variables by the Legendre orthogonal series function. The equation set derived can be converted into any order nodal schemes. It forms a compact system for general order of nodal moments. The method utilizes the analytic solutions of the transverse-integrated quasi -one dimensional equations and a consistent expansion for the spatial variables so that it renders the use of an approximation for the transverse leakages no necessary. Thus, we can expect extremely accurate solutions and the solution would converge exactly when the mesh width is decreased or the approximation order is increased since the equation set is consistent mathematically.

• 한국산학기술학회논문지
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• 제15권11호
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• pp.6922-6931
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• 2014

현대 과학기술과 컴퓨터공학의 발전은 정보통신 분야의 비약적 발전과 함께 생활양식에 많은 변화를 가져다주고 있다. 정부는 '미래교육 비전과 전략'을 통해 2030년의 미래사회를 예측하고 그에 맞는 인재 육성을 위해 미래지향적 관점으로 교육정책의 목표를 발표하였다. 교육과정의 변화에는 교육시설의 변화가 동시에 요구 되며, 교실운영과 교사공간정보는 연동된다. 최근 주목받고 있는 BIM 설계는 3D 형상정보 기반으로 설계할 수 있으며, 설계정보와 비형상 정보인 공간정보를 연계시킬 수 있다. 본 연구는 BIM 기반 교사공간정보를 활용하여 교육시설을 운영하고자 한다. 본 연구에서는 교사공간정보를 표준화하고 학교시설 BIM 발주와 운영을 위한 시나리오를 제안하고자 한다.

• 한국방사선학회논문지
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• 제12권1호
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• pp.85-91
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• 2018

전산화단층촬영기법은 투영 영상을 재구성하여 단면 영상을 획득하는 기법으로 다양한 분야에 적용되고 있다. 재구성된 영상의 공간분해능은 장치, 대상, 재구성 과정에 의존한다. 본 논문은 평행빔 구조에서 투영 영상의 개수 및 검출기의 픽셀 크기가 재구성된 영상의 공간분해능에 미치는 영향을 조사하였다. 재구성 프로그램은 Visual C++로 작성하였으며 단면 영상은 $512{\times}512$ 크기로 하였다. 공간분해능의 특성을 평가하기 위해 수학적 막대 팬텀을 구성하였고, Min-Max 방법을 도입하였다. 재구성에 사용되는 투영의 개수가 작은 경우 허상이 나타났으며 Min-Max도 낮았다. 투영의 개수를 지속적으로 증가시키면 재구성된 영상의 공간분해능을 나타내는 Min-Max는 상향 포화되었다. 검출기의 픽셀 크기를 재구성되는 단면 영상의 픽셀 크기의 50%로 줄이면 영상은 거의 완벽하게 복원되고, 검출기픽셀 크기가 증가할수록 Min-Max는 감소하였다. 본 연구는 CT장치 설계 시 요구되는 공간분해능을 달성하기 위해 필요한 검출기 및 회전 스테이지의 정밀도를 결정하는데 도움이 될 것이다.

• 한국가구학회지
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• 제23권1호
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• pp.75-83
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• 2012

Space dominates all the art activities human do and plays a role of providing aesthetic emotion. Architecture, sculpture, painting, and furniture, etc. these two and three dimensional works are represented in space and interpreted the role of its form, structure and function. Each area is different, but space has been studied in philosophy, physics, geometry, and mathematical studies, etc. and has been consistently interpreted and represented relating to a variety of human creative activity. Furniture is also three dimensional art being dependent on space. In the United States in 2004, I made the living room bench by applying the spatial concept at Rochester Institute of Technology. Two years later, this design was adopted by wendell Castle Collection, an American furniture company, then prototype were made and tested three times during a year, and then since 2007 as indoor benches it has been manufactured in the United States. The study's purpose is to order the process of its development based on the experience of bench production applied the spatial concept, and by analyzing the properties of spatial concept, I am planning to propose a new concept on interaction with the space and furniture for next.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.321-324
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• 2005

In these days, the management and visualization of 3D geo-spatial information is regarded as one of an important issue in GiS and remote sensing fields. 3D GIS is considered with the database issues such as handling and managing of 3D geometry/topology attributes, whereas 3D visualization is basically concerned with 3D computer graphics. This study focused on the design and implementation for the OpenGL API-based rendering system for the complex types of 3D geo-spatial features. In this approach 3D features can be separately processed with the functions of authoring and manipulation of terrain segments, building segments, road segments, and other geo-based things with texture mapping. Using this implementation, it is possible to the generation of an integrated scene with these complex types of 3D features. This integrated rendering system based on the feature-based 3D-GIS model can be extended and effectively applied to urban environment analysis, 3D virtual simulation and fly-by navigation in urban planning. Furthermore, we expect that 3D-GIS visualization application based on OpenGL API can be easily extended into a real-time mobile 3D-GIS system, soon after the release of OpenGLIES which stands for OpenGL for embedded system, though this topic is beyond the scope of this implementation.

• 디지털콘텐츠학회 논문지
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• 제15권3호
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• pp.347-355
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• 2014

컴퓨터 그래픽스나 기하 정보 분석 및 검색 등의 애플리케이션에서 일반적인 octree가 널리 사용된다. 그러나 거리장 등 공간에 분포하는 특정한 연속 정보를 샘플링하기 위한 목적으로 일반적인 octree를 적용할 경우 샘플링 데이터 중복과 샘플링 지점과 표현 단위의 불일치가 발생한다. 이 문제를 해결하기 위해 dual octree가 제안된 바 있다. 본 논문에서는 dual octree가 일반적인 octree의 단점은 해결했으나 무한하게 분할을 수행하더라도 특정한 연속 영역에 액세스하지 못한다는 사실을 증명하고 이러한 모든 문제들을 해결할 수 있는 대안으로 Lefebvre와 Hoppe가 제안한 primal tree를 응용할 수 있음을 제시한다. 또한 트리 구조의 병렬화에 널리 사용되는 Morton code를 응용한 3차원 primal tree 검색 알고리즘을 제안한다.

• 대한원격탐사학회지
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• 제31권4호
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• pp.321-330
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• 2015

Atmospheric correction is an essential part in time-series analysis on biophysical parameters of surface features. In this study, we tried to examine possible problems in atmospheric correction of multitemporal High Spatial Resolution (HSR) images obtained from two different sensor systems. Three KOMPSAT-2 and two IKONOS-2 multispectral images were used. Three atmospheric correction methods were applied to derive surface reflectance: (1) Radiative Transfer (RT) - based absolute atmospheric correction method, (2) the Dark Object Subtraction (DOS) method, and (3) the Cosine Of the Uun zeniTh angle (COST) method. Atmospheric correction results were evaluated by comparing spectral reflectance values extracted from invariant targets and vegetation cover types. In overall, multi-temporal reflectance from five images obtained from January to December did not show consistent pattern in invariant targets and did not follow a typical profile of vegetation growth in forests and rice field. The multi-temporal reflectance values were different by sensor type and atmospheric correction methods. The inconsistent atmospheric correction results from these multi-temporal HSR images may be explained by several factors including unstable radiometric calibration coefficients for each sensor and wide range of sun and sensor geometry with the off-nadir viewing HSR images.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.2
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• pp.71-76
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• 2006

With the rapid development of spatial infrastructure in US, Europe, Japan, China and India, there is no doubt that the next generation Global Navigation Satellite System (GNSS) will improve the integrity, accuracy, reliability and availability of the position solution. GNSS is becoming an essential element of personal, commercial and public infrastructure and consequently part of our daily lives. However, the applicability of GPS in supporting a range of location-sensitive applications such as location based services in an urban environment is severely curtailed by the interference of the 3D urban settings. To characterize and gain in-depth understanding of such interferences and to be able to provide location-based optimization alternatives, a high-fidelity 3D urban model of Melbourne CBD built with ArcGIS and large scale high-resolution spatial data sets is used in this study to support a comprehensive simulation of current and future GNSS signal performance, in terms of signal continuity, availability, strength, geometry, positioning accuracy and reliability based on a number of scenarios. The design, structure and major components of the simulator are outlined. Useful time-stamped spatial patterns of the signal performance over the experimental urban area have been revealed which are valuable for supporting location based services applications, such as emergency responses, the optimization of wireless communication infrastructures and vehicle navigation services.