• 한국실내디자인학회논문집
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• 제19권3호
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• pp.86-94
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• 2010

Art-Wall is the term for a surface wall representing artistic expression by using different materials or images in interior spaces. Usually this is the focal point in an interior space and sometimes it called as an image wall. In the new millenium Art-walls began to use in living spaces. While in the early stages of the development, Art-Wall was limited in a living room, in contemporary it spread into overall living spaces using various patterns and materials. Therefore, the research on Art-Walls in contemporary living spaces is essential to understand this development. The purpose of this study is to find out characteristics of patterns on Art-Walls as an imagery element in contemporary interior spaces. To analyze the characteristic, the analysis table for Art-Walls are constructed based on classifications of wallpapers and textiles. Based on this analysis table, 89 examples of Art-Walls from four major periodicals from 2008 to 2009 were examined. As a result of the analysis, in contemporary interior spaces solid-texture pattern is most frequently appeared. Then natural motifs are the next most popular using oversized or irregular layouts. The result shows that naturalistic expression is significant in interior space in 2008 to 2009. Therefore, Art-Walls that adapted diverse patterns are an essential element in contemporary interiors to represent the major concept of the space.

• 한국정밀공학회지
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• 제27권7호
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• pp.13-20
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• 2010

Due to the recent quantum leaps forward in bio-, nano-, and information-technologies, the precisionization and miniaturization of mechanical and electrical components are in high demand. The allowable margin for vibration limits for such equipments is becoming stricter. In order to meet this demand, understandings on the characteristics of vibration isolation systems are highly required. Among the components comprising the vibration isolation system, air spring has become a focal point. In order to develop a complex defect tester for COG bonding of display panels, a vibration isolation system composed of air springs for mounting is considered in this study. The dynamic characteristics of the air spring are investigated, which is the most essential ingredient for reducing the vibration problem of the tester to the lowest level. Uncoupled dynamic parameters of the air spring are identified through MTS experiments, followed by suggestion of a model-based approach to obtain the remaining coupled dynamic parameters. Finally, the dynamic behaviors of the air spring are estimated and discussed.

• 농촌계획
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• 제24권2호
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• pp.21-29
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• 2018

Riparian management has become important as stream water quality as well as riparian ecosystem gain more public attentions. The objective of this study was to determine riparian widths based on the functions of nutrient removal and wildlife habitat protection and to apply for the Jinwee stream area as a preliminary case. Nitrogen and phosphorus filtration efficiencies were considered in water quality aspect, while the habitat radii of amphibian and reptiles were used for wildlife conservation purpose. In addition, observation of endangered species and human impact on wildlife disturbance in riparian area were also taken into account in determining riparian widths. The stream confluence zone was emphasized by doubling the riparian widths as the focal point for wildlife habitat conservation. As the results, three different levels of riparian widths were proposed depending on the major riparian functions and applied to the Jinwee stream section as the case study. The proposed method can be used to determine riparian width in other stream areas based on different functional focus, ie, water quality or riparian conservation purposes.

• 한국전자파학회논문지
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• 제10권2호
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• pp.207-217
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• 1999

오프셋 반사경 안테나에서 1차복사기가 초점에 위치 하지 않을 경우 개구면 상의 전계분포에 위상왜곡이 생기게 되어 최대 빔 방향이 바뀌고 이득이 감소하며 사이드로브가 증가한다. 이런 스캔특성을 고찰하기 위 하여 1차복사기가 초점에서 벗어나 있는 오프셋 반사경 안테나의 복사패턴을 짧은 시간에 정확하게 계산할 수 었도록 Zernike 다항식을 이용하여 해석하고 이로부터 반사경의 구조에 따른 스캔로스에 관한 데이터를 나타냈다. 또한 오프셋 반사경 안테나에서 구조에 따른 BDF를 계산할 수 있도록 이론을 전개하고 계산 결과 를 제시하여 빔 편향 특성을 알아볼 수 있게 하였으며 간단한 BDF 근사식도 제시하였다.

• Transactions on Electrical and Electronic Materials
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• 제16권4호
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• pp.201-205
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• 2015

This paper dealt with the condensing technology of an LED light source that uses a parabolic reflector to replace a searchlight equipped with a xenon lamp. A ray-tracing simulation was conducted to analyze the influence of the diameter of the reflector and the size of the light source on light condensing. The combination of a parabolic reflector with a diameter of 620 mm and a focal distance of 220 mm, and a 9 mm multi-chip package (MCP) with a luminous flux of 7,000 lm showed the narrowest beam angle. The luminous intensity at the center was measured at 7.7×10⁶ cd. The distance between the light source and the point where the illuminance was 1 lx was calculated to be 2.8 km. The power consumption of the system was 95 W, which is only 9.5% of that of the 1 kW xenon searchlight, and the beam angle was 1.03°. In a site experiment, it was confirmed that the light ray reflected from the LED searchlight proceeds forward without any diffusion because of the narrow beam angle.

• 한국광학회지
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• 제26권6호
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• pp.299-305
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• 2015

사람 눈의 각막에 평행하게 입사하는 광선의 높이에 따른 결상점을 근사 없이 스넬의 법칙으로 분석하였다. 광선들이 망막의 동일한 한 점에 결상하도록 각막에 입사하는 광선들의 높이에 따른 입사각을 계산하기 위하여 결상점으로부터 광선을 역추적하여 각막 전면에 입사하는 광선의 입사각을 계산 하였다. 눈 자체로는 구면수차를 유발할 수밖에 없기 때문에, 구면 수차를 보정할 수 있는 비구면 렌즈 설계에 대한 조건을 유도 하였다. 계산을 쉽게 하기 위하여 렌즈 후면은 구면으로 고정하고 렌즈 전면을 비구면 렌즈 설계를 위하여 높이에 따른 곡률을 계산하였다.

• Journal of Welding and Joining
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• 제29권4호
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• pp.80-84
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• 2011

In the 5xxx series Al-Mg alloy, magnesium addition can increase the strength of aluminum alloy by solid solution strengthening but it has a relatively low melting and boiling temperature. During full -penetration laser welding of the Al-Mg alloys, its low boiling point and high vapor pressure brings about the spiky humping bead on the bottom side. Under back-side shielding, the spiking of back bead can be reduced but it restraints the process flexibility. In this study, a square pulse waveform modulation was employed to stabilize keyhole and back bead surface without back-side shielding. By using an experimental design, the bead shapes were evaluated for various process parameters such as the focal position, welding velocity and waveform parameters and the smooth back bead shape could be achieved.

• 치과방사선
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• 제23권2호
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• pp.373-378
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• 1993

저자들은 희귀한 하악과두의 골연골종으로 진단 내려진 27세 남성 환자에서 아래와 같은 사항을 관찰하였다. 1. 임상적으로 좌측안면부의 비대칭과, 교합이상 그리고 저작 시 좌측 악관절의 동통이 있었다. 2. 방사선학적으로 좌측과두에 내측으로 균일한 방사선불투과성의 종괴가 보였으며, 좌측 하악지 길이의 증가 및 우측으로의 하악 변위가 관찰되었다. 또 골스캔상에서 좌측 악관절부위의 hot spot이 관찰되었다. 3. 조직병리학적으로 불규칙한 골의 형성과 연골모를 볼 수 있었다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제14권3호
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• pp.201-206
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• 1992

The eyelids perform many complex functions and are esthetically important, since eye is focal point of face. Tumor extirpation or trauma can lead to full-thickness eyelid defect, which Should be reconstructed as soon as possible There are a number of operation methods for lower lid reconstruction, and among them, Hughes procedure is a time-honored method. Its advantages are good cosmetic result and conjunctival repair by using eyelid structures to rebuild eyelid structures. However, this is a two-staged procedure in which the vision of the affected eye is obstructed during the interval between the operations. We experienced a case of trauma-induced full-thickness lower lid defect extending over one-third of lid length treated by Hughes method. The cosmetic and functional result was good and there was no donor site morbidity, and now we report this case with review of literatures.

• 조명전기설비학회논문지
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• 제21권6호
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• pp.26-32
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• 2007

기존의 LED 광학계의 설계법은 크게 점광원 가정법과 가초점 설계법이 있으나, 이 설계법들은 LED와 광학계간의 거리가 매우 좁아지게 될 경우 큰 오차가 발생하는 단점이 존재하였다. 본 논문에서는 LED를 등간격으로 분할하여 각부분의 배광을 예측하고, 광선의 역추적 기법을 활용하여 이에 대한 결과를 확인한 후 분할된 각 구간에 대하여 세그먼트의 개별적인 설계를 통하여 오차를 감소시키는 새로운 설계법을 제시한다. 설계법의 설명이후에 2종의 예시 광학계를 설계하고 광학 성능 예측 프로그램을 통하여 배광과 광학 효율을 평가하였다.