• Proceedings of the Korea Information Processing Society Conference
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• 2003.05a
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• pp.607-610
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• 2003

지문 정합을 할 때 특징점 사이의 거리와 각도가 유사한 순서대로 있는가를 비교하는 알고리즘을 제안한다. 한 점에서 가장 가까운 특징점을 찾고 다시 찾은 점에서 가장 가까운 특징점을 찾는데 이러한 세 개의 특징점들 사이의 거리와 끼인 각도를 기본 요소로 하여 이들의 순차를 특징점 배치도로 정의하여 등록지문에도 유사한 순차가 있는지를 검사한다. 정합 시에 특징점 사이의 거리, 각도 순차가 있는가를 검사하기 때문에 중심점을 찾지 않아도 되며 지문의 이동, 회전에 영향을 받지 않는다.

• Explosives and Blasting
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• v.22 no.1
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• pp.5-13
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• 2004

성형폭약의 설계변수인 폭약 종류, 폭약 량, 라이너 각도, 라이너 두께, 라이너 재질들을 다원배치법으로 분석하였다. 교호작용이 있는 설계변수는 강건 설계를 통하여 기여비를 산정하여 정량적으로 평가하였다. 연구결과 폭약종류와 라이너 각도는 비교적 독립적인 설계변수였고 약량과 라이너 재질, 라이너 두께는 교호작용이 있었다. 강건설계에 의해 산정된 설계변수의 기여비는 약량이 73.3%, 라이너의 재질이 19.4%, 라이너의 두께가 7.3%이다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.06a
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• pp.99-101
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• 2017

최근 딥러닝을 이용한 SAR 영상의 목표물을 인식하는 알고리즘이 괄목할만한 성능을 보여주었다. 이러한 알고리즘들은 포즈 각도 정보를 무시한 채 목표물의 종류를 추정하는 것에만 초점을 맞춘다. 포즈 각도 추정 알고리즘은 단지 SAR 영상 목표물 인식 알고리즘의 전처리 과정으로 연구되었다. 하지만 감시 시스템에서, 목표물이 향하고 있는 방향을 추정하는 것 또한 중요하다. 먼저, 포즈 각도 추정을 통하여 적의 전술 배치를 계획을 추정할 수 있다. 또한 목표물이 아군 쪽을 바라보면 큰 위협이 되는데, 포즈 각도 추정을 통하여 이러한 정보를 알 수 있다. 따라서 본 논문은 목표물이 향하고 방향을 추정할 수 있는 콘볼루션 네트워크를 고안하였다. 네트워크를 학습시키기 위하여 SAR 영상의 목표물의 포즈 각도를 양자화하여 포즈 각도 label 을 구성하였다. 또한 이러한 포즈 각도 추정을 정제하는 알고리즘을 고안하였고 이는 보다 정확한 포즈 각도 추정을 가능하게 하였다. 그 결과, 제안된 네트워크는 포즈 각도 추정에 높은 정확도를 보여준다.

• Journal of Convergence for Information Technology
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• v.10 no.6
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• pp.14-18
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• 2020

In this paper, when two sets of cross-eye jammer antennas are installed vertically to jam a monopulse radar, the jamming effects according to the jammer's phase difference, amplitude ratio, and radar angle of engagement are analyzed. The phase difference and amplitude ratio of the cross-eye jammer can be adjusted in the jammer, but since the angle of engagement is relatively determined by the radar, it is very important to respond to changes in the angle of engagement. The orthogonally deployed jammer antennas can be considered as a good way to increase the jamming effect while minimizing the hardware configuration, and the jamming effect is analyzed while changing the angle of inclination from 0° to 360°. This jammer greatly improves the jamming effects at the angles of incidence 45°~135° and 225°~315°, compared to a single jammer. And it is expected to be useful in the design of cross-eye jammers for military aircraft and ships.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.06a
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• pp.453-454
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• 2008

본 논문은 가로등 LED조명 설계를 위해 LED(Light Emiting Diode)소자 특성 분석 및 시뮬레이션을 통한 광 특성을 개선하고자 하였다. 시뮬레이션은 Geometry 와 Optic 특성을 고려하였으며, 광속, 스펙트럼, 지향각, 조도값 분석을 통해 제품과 시뮬레이션 특성을 비교하였다. 광 특성 개선 설계변수로는 $30^{\circ}C{\sim}50^{\circ}$ 사이의 2차 렌즈를 각도별로 설계하여 35 도 렌즈 각도일 때 최대 조도특성을 확인했으며, LED 모듈간 간격 배치는 3Cm 일 때 가장 높은 조도특성이 나타났다. 9개의 LED모둘 각도를 정면 Angle($\theta1$)과 측면 Angle($\theta2$)으로 구분하여 각도에 따라 배치 시켜본 결과, 정면 Angle($\theta1$)은 0도일 때, 측면 Angle($\theta2$)은 10도 일 때 가장 높은 조도 특성이 나타났다.

• Journal of Cadastre & Land InformatiX
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• v.49 no.1
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• pp.17-27
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• 2019

In this study, we conducted a study to predict the photovoltaic power by constructing the sensor based meteorological data observation system and the accurate terrain data obtained by using LiDAR surveying. The average sunshine hours in 2018 is 4.53 hours and the photovoltaic power is 2,305 MWh. In order to analyze the effect of photovoltaic power on the installation angle of solar modules, we installed module installation angle at $10^{\circ}$ intervals. As a result, the generation time was 4.24 hours at the module arrangement angle of $30^{\circ}$, and the daily power generation and the monthly power generation were the highest, 3.37 MWh and 102.47 MWh, respectively. Therefore, when the module arrangement angle is set to $30^{\circ}$, the generation efficiency is increased by about 4.8% compared with the module angle of $50^{\circ}$. As a result of analyzing the influence of the seasonal photovoltaic power by the installation angle of the solar module, it was found that the photovoltaic power was high in the range of $40^{\circ}{\sim}50^{\circ}$, where the module angle was large from November to February when the weather was cold. From March to October, it was found that the photovoltaic power amount is $10^{\circ}{\sim}30^{\circ}$ with small module angle.

• Journal of the Korea Institute of Building Construction
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• v.9 no.6
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• pp.169-174
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• 2009

We conducted structural analysis to investigate disadvantage of wire-mesh arranged at the plane and to develop three-dimensionally bent U-type wire-mesh. In all case that distributed loading at the whole top slab and the half top slab, and the wire mesh was bent $45^{\circ}$, flexura tensile stress was the fewest in both positive moment and negative moment, and the wire mesh was bent $45^{\circ}$ in crossway the shear stresss was the fewest. Therefore, by arranging wire-mesh with $45^{\circ}$ more bent than plane, flexura tensile stress, shear stress, displacement will be reduced and structural function will be improved.

• Fire Science and Engineering
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• v.31 no.3
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• pp.54-62
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• 2017

The aim of this study is to find out the water spray features of in-rack sprinklers for rack storage. This study conducted cold water flow test, measurement of spray angle and densities by angles for sprinkler head manufactured by a Korean company and a U.S. company. Korean sprinkler head had a wide angle of water spary. The water spray angle of a U.S. sprinkler head was narrow compared to the Korean sprinkler. In comparison of the Korean head with U.S. head of the same K80, the Korean head can send water to parts that are difficult to directly spray, but the spraying density by angle was low. U.S. head can send more water than Korean head at a narrow angle. In conclusion, for flammable materials placed in two or more rows in a rack storage, a zigzag arrangement with face sprinklers will be effective.

• Proceedings of the Korean Geotechical Society Conference
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• 1991.10a
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• pp.348-361
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• 1991

When reinforcing strip footing on a sand 8round with reticulated root piles, reinforcing effect depends on the length , number, cross sectional area, penetration angle, spacing, and Young's modulus of piles. the mode of action of reinfocement tendons in soil isn't one of carring developed tensile stresses but of anisotropic(uni-directional) reduction or even supression of one normal strain rate. R. H. Bassett and N. C. Last proposed that the reinforcement should be located on the direction of minor strain rate which coincides with the tensile strain rate in the velocity characteristics. Based on this proposal the author carried out a series of 2 - dimentional finite element analysis which varies the parameters mentioned above.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.2
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• pp.7-12
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• 2001

In this paper, the optical arrangement of LED lamps was studied using an optical design software for illumination applications. A standard source was constructed, and then simulated its light distribution characteristics of the basic arrangements by shape, by angle, and by displacement. And the color variation circuit was constructed to obtain stabilized light and color output in consideration of the electrical and optical characteristics of high brightness RGB LEDs.