• 한국게임학회 논문지
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• 제10권4호
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• pp.63-71
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• 2010

본 논문에서는 증강현실 게임을 위하여 마커 영역을 이진화 할 수 있는 경계선 기반 마커 이진화 방법을 제안한다. 먼저, 경계선을 검출하기 위해 원 영상을 그레이 스케일 영상으로 변환한 뒤 경계선을 검출하고 마커영역의 경계선을 폐구간으로 만들기 위해 모든 경계선 화소에 대해서 4방향 확장 연산을 수행한다. 그리고 검출된 모든 경계선에 대해서 좌 우 화소의 명도를 비교하여 낮은 쪽에 검은색, 높은 쪽에 흰색을 할당하여 씨앗 영역 확장 기법을 통해 내부 영역을 채우면 마커영역의 이진화가 완료된다. 제안된 방법은 조명의 영향에 민감하지 않은 경계선 정보를 이용하여, 기존 단일 임계값을 사용한 이진화 방법에 비해 단계적 조명이나 그림자의 영향을 받은 영상에서도 마커 인식이 가능한 이진화 결과를 보였으며, VGA급 영상을 대상으로 평균 51fps의 처리속도를 보여 실시간 처리가 가능함을 알 수 있었다.

• 대한지리학회지
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• 제33권1호
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• pp.41-56
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• 1998

본 논문은 1990년대의 서울 중심업무지구의 경계를 설정하고 그 내부 소구역의 기능상의 특성 및 내부구조를 밝힌 연구이다. 서울은 한국 자본주의의 중심이며 그 중요 기능은 서울중에서도 도심부에 집적되어 있다. 서울 도심부의 위치는 종로${\cdot}$중구를 중심으로 하는 곳이다. 도심부의 평면적 범위는 고층화, 도심재개발, 부심의 성장, 대기업화, 다지역 기업 체제의 할성화 및 도심기능의 입지상 공간적 제약으로 그다지 확대되지 않았지만, 고차적인 도심기능은 더욱 집중되고 있다. 서울 도심의 내부구조는 핵심부, 소매업 특화지구, 사무실 특화지구, 서비스 특화지구, 제조업 특화지구 등 몇 개의 기능상의 특화지고로 구분되며, 이들 기능지구들이 상호의존적으로 결합되어 있으며, 발생적으로는 서울의 도시발달의 과정을 고려해야 그 특성이 파악된다.

• 한국주조공학회지
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• 제34권5호
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• pp.170-178
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• 2014

Using the Gleeble test, the effects of [Mn/S] ratios and the presence of sulfides on the high-temperature fracture morphology of heavy-section steel castings were analysed via the observations of the microstructures. The specimens for which the [Mn/S] ratio was in the range of 60~80 showed a ductile fracture morphology with an area reduction of more than 60%, while some specimens with similar [Mn/S] ratios showed a brittle fracture morphology with an area reduction of 0.0% due to the liquidation of sulfides at the grain boundary. The fracture morphology was classified into three types in the Gleeble high-temperature tensile test specimens. The first type showed dimple formation at the grain boundary, the formation of globular MnS sulfides, and plastic deformation of sulfides at an elevated temperature, indicating a needle-point type of ductile fracture with area reductions of 96.0~97.8%. The second type was a knife-edge type brittle fracture with an area reduction of 0.0% due to the film-type liquidation of sulfides at the grain boundary, band-type liquidation, and the liquidation of a terraced nipple pattern. The third type was the typical ductile fracture with an area reduction of 31.3~81.0%, in accordance with the mixture of dimples with in the grains and terraced nipple pattern at the grain boundary.

• 한국측량학회지
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• 제35권6호
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• pp.509-516
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• 2017

지적측량의 경우 수치측량을 실시하는 지역에서는 사실상 면적오차를 허용하고 있지 않으며, 도해측량을 실시하는 지역에서는 필지 형상과 무관하게 면적오차를 규정하고 있다는 문제점이 있다. 본 연구에서는 이 두 가지 문제점의 파악에 필요한 면적오차의 일반식을 도출하였다. 이 수식을 이용한 계산에 의하면, 현실적으로 지적재조사 사업의 필지경계점의 좌표오차를 5cm+10ppm으로 둘 경우, $100 m^2$ 필지라 해도 면적오차가 $0.71m^2$ 로서 무시할 수 없는 것으로 나타났다. 또, 지적법시행령에서 규정한 면적오차는 경계점 오차를 ${\sigma}_o=0.3mm{\times}$ 도면축척으로 둘 경우 변장 비율이 1:5인 직사각형의 면적오차와 일치하였다. 이러한 결과는, 다각형 필지의 면적오차는 경계점 좌표의 오차 크기를 지정함으로써 측량 방법을 구분하지 않고 하나의 수식에 의해 면적오차의 허용범위를 정할 수 있다는 것으로, 지적측량의 면적오차를 규정하는 현행 규정을 합리적으로 개정하는 데에 활용될 수 있다.

• 한국멀티미디어학회논문지
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• 제17권10호
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• pp.1150-1159
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• 2014

This paper proposes a method for extracting tissue cells from an organism image by an electron microscope and getting the whole cell number and the area from the cell. In general, the difference between the cell color and the background is used to extract tissue cell. However, there may be a problem when overlapped cells are seen as a single cell. To solve the problem, we split them by using cell size and curvature. This method has a 99% accuracy rate. To measure the cell area, we compute two areas, the inside and boundary of the cell. The inside is simply calculated by the number of pixels. The cell boundary is obtained by applying super sampling, linear interpolation, and cubic spline interpolation. It improves the error rate, 18%, 19%, and 120% respectively, in comparison to the counting method that counts a pixel area as 1.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2022년도 추계학술발표대회
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• pp.648-649
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• 2022

Glass is a common object in living environments, but even humans are sometimes unable to identify it. This study proposes a method for detecting glass area by learning edge information from images. The network structure of Transformer is used to accept the base features extracted by backbone and extract the boundary information of RGB images, and both features are used to learn the features of glass area and determine the glass area based on these boundary features. The experimental results show that our proposed method can detect glass area in images.

• 한국통신학회논문지
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• 제31권3C
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• pp.264-270
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• 2006

In this paper, we propose the modified display color control system using white point line, boundary lines and S-shaped curves to emphasize blue and red tone colors on CIE1931 diagram. The proposed system divides RGB gamut into movable area and non-movable area by using boundary lines. The colors in movable area are moved into right side or left side along quadratic curve to change the bluish (or reddish) color to more bluish (or more reddish), while those in non-movable area are excepted from color control to prevent skin color from changing. The loci of the quadratic curves are very similar to the arc of the white-point line which connects all points that represent the chromaticities of a black body radiator at different temperatures and is also called the black body locus. The RGB gamut extension by movement of chromaticity coordinate can improve color reproducibility. Therefore in the case of application to LCD, the display shows excellent performance because the LCD's color reproducibility is comparatively lower than that of other display systems. The proposed system is also experimentally demonstrated with Xilinx Virtex FPGA XCV2000E- 6BG560 and the TV set.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 B
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• pp.818-820
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• 1999

In this paper, a new boundary tracking algorithm for extracting finger area, which may be utilized by a finger crease pattern recognition algorithm, is proposed. Due to noise and irregular illumination, conventional algorithms for boundary tracking such as skeleton-based tracking methods were not suitable for typical boundary image of hand. So we propose a new finger boundary tracking algorithm utilizing a boundary-point-detection mask. We have observed that the proposed method provides stable and optimised boundary tracking.

• 대한조선학회지
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• 제23권1호
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• pp.13-22
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• 1986

Axisymmetric turbulent thick boundary layers on a rotating body of revolution are calculated numerically in the paper. Richardson number is introduced to the mixing length to take account of swirl effects on Reynolds stresses. Interactions of the boundary layer and the external potential flow are included by adding the displacement thickness of boundary layers on the original body. Pressure distributions on the body surface are estimated by integrating normal momentum equation across the boundary layer. A model is designed and tested in the wind tunnel. Mean velocities are measured. Through the present study, swirl effects on the thick axisymmetric boundary layer development are considerable in comparison with those of non-totating cases. Rotational motion generally increase boundary layer thickness, axial skin friction coefficients, and form drags. Circumferential flow can be reversed to induce negative skin friction when the section area is reduced.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 추계학술발표회
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• pp.17-20
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• 2002

The environmental tracers of $^3$H and NO$_3$ were investigated in terms of vertical connections between basaltic aquifers and underlying sedimentary formations of Seoguipo formation that is not found in eastern coastal area and U formation. In western coastal area, $^3$H shows values less than 0.5TU In the wells completed in Seoguipo formation whereas it is greater than 2TU in other area. For the wells in western area, NO$_3$ concentrations are below background level though the nearby land uses are mainly agricultural. The groundwater heads are much lower in eastern coastal area than western area in spite that recharge rate of eastern area is 1.7 times higher than that of western area. The basaltic aquifer is thicker by 70m in eastern coastal area than in western coastal area, which is insufficient to explain much lower groundwater heads in eastern area. These hydrogeological characteristics suggest that for the basaltic aquifers, the Seoguipo formation acts as a lower boundary which could limit downward groundwater flow in basaltic aquifers whereas the U formation is unlikely.