• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.20 no.3
• /
• pp.520-525
• /
• 2019

Mines are an important infrastructure for securing resources, but safety problems can arise in the course of operation. Recently, the mining process is very complicated due to the large scale and mechanization. Therefore, it is necessary to construct accurate geospatial information on mine for systematic and safe mine operation. The geospatial information construction using the existing total station has a disadvantage that a lot of work time is required because the target must be collimated and measured. In this study, the data of the mines were acquired with the total station and the 3D laser scanner, and the mine spatial information was constructed by using the shape based registration method. By using the static scanner data of some area applying the reference point surveying result of the total station, it was possible to construct the accurate result on the wide area acquired by the mobile scanner effectively. Also, the accuracy of the constructed geospatial information was evaluated and the deviation of mean 0.083m was shown. Point cloud products constructed through the research can contribute to the efficiency improvement of mine management by enabling quantitative analysis such as visualization of mine shape, distance, area and slope, and automation of drawing creation for cross section shape.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2006.05a
• /
• pp.1721-1725
• /
• 2006

유한요소법으로 공학적 문제를 해결할 때에는 적절한 모델링을 통하여 가장 빠르고 정확한 해를 얻도록 해야 한다. 유체 흐름의 기본 변수인 속도는 그 공간 도함수가 요소간에 불연속을 이루게 된다. 속도의 공간 도함수는 기본적으로 유체에서의 응력, 압력, 및 와도 등과 밀접한 관련이 있다. 또한 이러한 요소간의 속도의 공간 도함수에서 발생하는 불연속의 크기는 요소망이 세분화되어 감에 따라 감소하면서 정확한 해에 수렴하게 된다. 즉 속도의 공간 도함수를 대상으로 오차에 정도를 판단하는 것이 기존의 유한요소 모델의 타당성을 판단하는 기준으로 적합함을 알 수 있다.

• Journal of Korean Association for Spatial Structures
• /
• v.6 no.2 s.20
• /
• pp.107-114
• /
• 2006

The purpose of this study is to explore the morphology of polyhedra as a tool diversifying the approach to structures and shapes, and to consider the way of the morphogenesis as structural design sources. First, through many examples in nature and styles used as the rhetorical representation of buildings, the shapes of which are based on one of polyhedra are shown. Secondly, the morphogenetic characteristics of polyhedra limited to pure lattice structure are investigated. Thereby the methodology of spatial morphogenesis of polyhedra as structural design sources are generated.

• Korean Architects
• /
• no.2 s.382
• /
• pp.67-73
• /
• 2001

우리나라 주거양식의 근대화는 단순히 전통한옥에서 현대의 주택, 아파트로의 교체가 아니라 일련의 연속적인 변화과정 속에서 시대를 살아온 사람들의 생활양식과 문화를 담고 있다고 볼 수 있다. '주택이란 삶을 담는 그릇'이라는 표현에서 볼 수 있듯이 주택이란 거주자의 가치관을 포함한 주생활양식과의 대응 속에서 주거환경의 질적 향상이 이루어질 수 있다. 따라서 주거양식의 변화에 관한 연구 또한 이러한 삶과 문화에 대응하는 방향으로 이루어져야 바람직할 것이다. 이상의 배경 하에 과거 전통주택에서부터 근대화 이후의 여러 주택유형에 이르기까지 다양한 유형을 포함한 우리 나라 주택이 가지는 공간구조의 변천을 시대적으로 조망하고자 하였다. 이를 위하여, 전통사회의 양반주택, 도시형한옥, 표준주택, 일반단독주택, 작가주택, 아파트에 이르는 다양한 주택유형을 포함하여 총 104개의 주택평면을 대상으로 공간구조의 변화에 대한 분석을 실시하였다. 또한 다양한 주택유형들이 보여주는 공간구조와 그 통시적 변화를 객관적이고 계량적인 방법론을 이용하여 관찰하고자 공간구문론의 분석방법을 이용하여 주택형식에 따른 기능적 형상학을 뛰어넘는 사회학적 형태학의 관점에서 우리나라 주거의 변천과정을 고찰하고자 한다. 상기한 바와 같이 개개의 주택형식에 대한 고려보다는 시대적 상황과 배경을 설명해주는데 용이한 대상을 중심으로 전반적인 변화의 양상과 그러한 변화에 내재한 사회적 동인과 배경을 파악하고 이해하고자 하였다.

• Computational Structural Engineering
• /
• v.11 no.4
• /
• pp.197-207
• /
• 1998

전단변형 효과를 무시하는 경우에 비대칭 선형 변단면을 갖는 박벽 공간 보의 안정성 해석을 위한 일반이론을 유도한다. 비대칭 선형 변단면의 임의점을 통과하는 부재축과 단면의 주축의 방향과 무관하고 부재축과 직각을 이루는 두 개의 좌표축을 도입하여 직각좌표계를 정의한다. 정의된 좌표축을 기준으로 유한한 회전각의 2차항을 고려하는 변위장을 도입하여 연속체에 대한 가상일의 원리로부터 탄성변형에너지, 그리고 초기응력에 의한 포텐셜에너지를 유도한다. 이를 이용하여 비대칭 선형 변단면을 갖는 박벽 공간 보의 안정성해석을 위한 평형방정식을 제시한다. 3차 Hermitian 다항식을 변위파라미터의 형상함수로 사용하여 박벽 공간 보의 탄성강도 및 기하강도행렬을 상정할 뿐만 아니라, 단면의 좌표축에 상관없이 임의의 위치에 작용하는 하중에 대한 하중보정강도행렬(load-correction stiffness matrix)을 제시한다. 본 이론 및 방법의 타당성을 검증하기 위하여 수치해석을 수행하고 문헌의 결과 및 쉘요소를 사용한 해석결과와 비교하여 본 이론의 정당성을 입증한다.

• The KIPS Transactions:PartA
• /
• v.10A no.4
• /
• pp.357-368
• /
• 2003

Evaluation of shape similarity for 3D models is essential in many areas - medicine, mechanical engineering, molecular biology, etc. Moreover, as 3D models are commonly used on the Web, many researches have been made on the classification and retrieval of 3D models. In this paper, we describe methods for 3D shape representation and major concepts of similarity evaluation, and analyze the key features of recent researches for shape comparison after classifying them into four categories including multi-resolution, topology, 2D image, and statistics based methods. In addition, we evaluated the performance of the reviewed methods by the selected criteria such as uniqueness, robustness, invariance, multi-resolution, efficiency, and comparison scope. Multi-resolution based methods have resulted in decreased computation time for comparison and increased preprocessing time. The methods using geometric and topological information were able to compare more various types of models and were robust to partial shape comparison. 2D image based methods incurred overheads in time and space complexity. Statistics based methods allowed for shape comparison without pose-normalization and showed robustness against affine transformations and noise.

• Spatial Information Research
• /
• v.19 no.2
• /
• pp.29-36
• /
• 2011

This study performed quantitative assessment of the performance of adjustment models by a-priori analysis of the statistics of the surface parameter estimates against modeling factors. Lidar, airborne imagery, and SAR imagery have been used to acquire the earth surface elevation, where the shape properties of the surface need to be determined through neighboring observations around target location. In this study, parameters which are selected to be estimated are elevation, slope, second order coefficient. In this study, several factors which are needed to be specified to compose adjustment models are classified into three types: mathematical functions, kernel sizes, and weighting types. Accordingly, a-priori standard deviations of the parameters are computed for varying adjustment models. Then their corresponding confidence regions for both the standard deviation of the estimate and the estimate itself are calculated in association with probability distributions. Thereafter, the resulting confidence regions are compared to each other against the factors constituting the adjustment models and the quantitative performance of adjustment models are ascertained.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.26 no.1B
• /
• pp.15-25
• /
• 2006

Using kinematic wave equation, the influence of moving storms to runoff was analysised with a focus on watersheds. Watershed shapes used are the oblong, square and elongated shape, and the distribution types of moving storms used are uniform, advanced and intermediate type. The runoff hydrographs according to the rainfall distribution types were simulated and the characteristics were explored for the storms moving down, up and cross the watershed with various velocity. The shape, peak time and peak runoff of a runoff hydrograph are significantly influenced by spatial and temporal variability in rainfall and watershed shapes. A rain storm moving in the cross direction of channel flow produces a higher peak runoff than in the downstream direction and upstream direction. A peak runoff from a storm moving downstream exceeds that from a storm moving upstream. For storms moving downstream peak time was more delayed than for other storm direction in the case of elongated watershed. The runoff volume and time base of the hydrograph decreased with the increasing storm speed.

• Journal of Korean Association for Spatial Structures
• /
• v.7 no.3 s.25
• /
• pp.125-132
• /
• 2007

The purpose of this study is to investigate the functions and formations of the component units as aesthetic components in the spatial grid. The main subject covered here is the presentation of the morphological method of shaping spatial grid by application of 3-dimensional units satisfying the suitable form of polyhedra, tensegrity and hybrid structure. In accordance with the subject, the definition of the spatial grid and 3-dimensional nit, the relationship between them, and then the functions of those units are reviewed. And the formations of polyhedral units, tensegrity units and hybrid units are generated by means of the modules of the simplest type or pattern. And also the overall appearance of the spatial grid shaped by several basic methods in which one unit can be joined to another and arranged are depicted.

• Journal of the Korean Association of Geographic Information Studies
• /
• v.8 no.3
• /
• pp.1-10
• /
• 2005

The purpose of this paper is to conduct an experimental measurement and analysis of cities' morphology. Fractal theory that is an effective tool for evaluating self-similarity and complexity of objects was applied. For the comparative analysis of fractailities and computational verification, two totally different cities in Japan were selected. They are Kitakyushu City, which is a big and fully developed city, and Jinguu Machi of which almost all the area is covered with agricultural land use. After converting vector data to raster data within GIS, fractal dimensions of two cases in Kitakyushu City and one case in Jinguu Machi were calculated. The calculation showed that two parts of Kitakyushu City were already fractal. Jinguu Machi, however, was difficult to find fractality. As a conclusion, fractal was proved to be an useful tool to estimate the shape of cities reflecting their internal spatial structure, that is self-similarity and complexity.