• 천문학회보
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• 제43권1호
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• pp.68.3-68.3
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• 2018

The MATS (Mesosphere Airglow / Aerosol Tomography Spectroscopy) satellite is a Swedish scientific microsatellite which Kyung Hee University participates in developing. The limb telescope of the MATS satellite is designed with linear astigmatism-free off axis optical configuration which allows wide field of view ($5.67^{\circ}{\times}0.91^{\circ}$). Here we present the full-field optical performance test setup that consists of a point source, a collimator, the limb telescope and a CCD (Charged Coupled Device). The incidence angle of the collimator was carefully controlled by the rotary stage under the limb telescope. The imaging tests represent expected results without dominant aberrations.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2002년도 춘계학술대회 논문집
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• pp.25-28
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• 2002

This paper is concerned with the design of roller profiles in tube/pipe straightener with both methods of Computer Aided Design and Computer Aided Engineering. Design analysis is carried out from two point of view. The one is the research in the minimization of tube pitch which was very important factor in levelling process. In order to minimize tube pitch, profiles of the roller were calculated so that the contact region between roller and tube was maximized. The other is determination of an optimum amount of intermesh for the proper progress without a jam in levelling process. Generally the jamming trouble was casued by excessive amount of intermesh in levelling process. The optimum amount of intermesh was determined through the finite element analysis.

• 대한기계학회논문집
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• 제16권5호
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• pp.864-872
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• 1992

본 연구에서는 이중노출 홀로그래피 간섭계의 원리를 이용하여 임의의 2차원 적 변형에 있어서 면외 변위와 면변위(in-plane displacement) 각각에 대한 홀로그램 을 제작하고 이를 컴퓨터에 입력하여 간섭무늬를 해석함으로써 변위와 변형률의 정량 화를 시도하였다.

• 한국산업융합학회 논문집
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• 제2권2호
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• pp.181-186
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• 1999

For an unmanned machining system, the control and disposal of chips is one of the most serious problems at present. In order to perform chip control, feed/land length($F_L$) was introduced, and using this parameter, the cutting performance and chip breaking characteristics of groove-type and the land -angle-type chip formers were assessed. The specific cutting energy consumed and the shape of broken chips with its breaking cycle time were evaluated to find out the ranges of $F_L$ value where efficient cutting and effective chip breaking could be achieved. The C type chip was found to be the most preferable from the view point of cutting efficiency.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전력기술부문
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• pp.151-153
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• 2002

Using UPFC(Unified Power Flow Controlled), it is possible to control three parameters(voltage, impedance, and phase angle). The UPFC can generate or absorb reactive power rapidly so as to enhance the transient and voltage stability and also influence the power flow. In this paper, the effects of application of the UPFC to the power system are analyzed from a viewpoint of improving the total transfer capability by enhancing voltage stability. The IPLAN, which is a high level language used with PSS/E program, is employed for evaluating the total transfer capability from a f-V curve.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회B
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• pp.2967-2970
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• 2007

In a usual painting process, a liquid drop spreads on canvas by being dragged along a paintbrush. To obtain the fundamental understanding of the painting process from the mechanical point of view, we experimentally investigate various dynamic behavior of a liquid drop that spreads between moving solid plates. It is shown that three distinct types of drop spreading take place, i.e. shearing, spreading, and intact dragging, depending on the liquid viscosity and surface tension, the plate speed, and the wettability. We suggest a regime map based on the capillary number and the receding contact angle, which indicates the boundaries between different types of spreading behavior in a dimensionless space.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.573-575
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• 2003

In satellite spectra, Though the magnitude varies with intensity of sunstroke, dip angle of land so on, the shape is less deformed with these effects. from this point of view, we have developed a spectral shape-dependent analysis utilizing a normalization procedure by the spectral integral and applied it to Landsat/TM spectra. Inevitable topographic and atmospheric effects can be suppressed. The correction algorithm is very simple and timesaving and the suppression of topographic effects is especially effective. Normalized band 4 is almost linear to NDVI values, and is available to the vegetation index.

• 한국측량학회지
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• 제27권3호
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• pp.323-330
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• 2009

최근 도시시설물의 안전과 범죄 모니터링에 대한수요가 증가하고 있으나, 사용되는 산업장비용 CCTV의 경우 고가가 대부분이다. 본 연구에서는 초 광각 렌즈인 어안렌즈와 사진측량 알고리즘을 이용하여 단일 카메라의 시야각을 증대시켜 모니터링의 효율성을 극대화 시키고자 한다. 어안렌즈를 이용한 모니터링을 위해 우선 실험실 내에서 왜곡계수 산출 실험을 실시하였는데 이는 일정 간격의 고정된 종이 타겟을 여러 방향에서 촬영한 후, 격자점을 이용하여 왜곡 계수를 추출하였다. 또한 추출된 왜곡보정 계수를 보정 및 모니터링 프로그램에 삽입하여 실시간 보정된 영상을 획득할 수 있다. 또한 보정된 영상에 대한 검증을 위해, 타겟을 스캐닝하여 왜곡 보정된 영상과 비교한 결과 RMSE가 3.2pixel로 나타났다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2010년도 춘계 학술대회 제22권1호
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• pp.51-52
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• 2010

아치 작용과 트러스 작용의 관점에서 주근의 부착강도가 전단강도에 미치는 영향을 살펴본다. 부�T강도를 고려한 응력장으로 깊은 보와 얕은 보의 가능한 전단파괴의 종류를 구분할 수 있다. 또한 대각선 응력장의 기울기는 전단강도를 결정하는 응력전달 요소 중 2 개가 항복점에 도달할 ��의 균형점으로 해석할 수 있다.

• International Journal of Ocean System Engineering
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• 제1권3호
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• pp.155-164
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• 2011

The second-order motion characteristics of a semi-submersible are investigated in regular waves. A higher-order boundary element method in a frequency domain and a finite element method in a time-domain were applied to the numerical analysis of the nonlinear hydrodynamic force and motion characteristics of semi-submersibles in view point of potential flow. Various aspects of nonlinear effects on the heave and roll of a semi-submersible were numerically investigated and some selected cases were compared with the model test data.