• 한국안전학회지
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• 제36권2호
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• pp.26-31
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• 2021

Buildings with glass curtain walls have become popular due to their appealing aesthetics and ability to let in natural light. However, light reflection from the glass surface is unavoidable in these buildings. In particular, the reflection of light from the glass envelope can create afterimage glare, a hazard to nearby drivers and pedestrians. Despite this potential danger, glare from buildings with curtain walls has not been well-studied. Hence, we analyzed the effect of light reflection on glare around a glass-enclosed skyscraper, depending on its surface reflectance. We investigated the potential hazard of glare to drivers using a commercially available software program. The results indicate that the direction of light reflection is distinctive when the incident angle of solar light increases. Moreover, this light reflection is high enough to induce an afterimage to drivers and pedestrians near the building. We found that keeping the reflectance of the building surface under 3% is required to minimize the afterimage hazard to drivers. Consequently, we recommend managing glass reflectance and installing additional traffic safety systems to reduce traffic accidents near curtain wall buildings.

• 한국안광학회지
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• 제1권1호
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• pp.93-102
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• 1996

렌즈의 광학계의 분광투과률을 높이기 위한 방법으로 무반사막의 다층화에 의한 광대역화와 낮은 반사률이 중요하다. 그러나 잔류반사광이 발생하여 반사색광이 미약하게 나타난다. 이런 반사색광은 두께, 굴절율, 층수, 입사광의 파장, 기판물질 등의 구조에 의한 반사광의 파장 영역을 제어할 수 있다. l층, 2층 구조에서 ${\lambda}s/{\lambda}$=1.0인 조건하에서 무반사시키면, 다른 영역에서 나온 반사광들이 색혼합된 반사색광을 얻을 수 있고, 3층 구조에서 ${\lambda}0/{\lambda}$가 $PI{\ll}1$, $P2{\gg}1$ 에서 무반사시키면 P1< ${\lambda}0/{\lambda}$

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.276-279
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• 2003

The phase change upon reflection from target surfaces in white-light interferometer induces measurement errors when target surfaces are composed of dissimilar materials. We prove that this phase change on reflection considered of the polarization of the white-light causes the shift of both envelope peak position and fringe peak position of several tens of nanometer. In addition, we propose a new equation of white-light interference fringe pertinent to the polarization of source.

• 한국안광학회지
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• 제3권1호
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• pp.201-207
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• 1998

눈의 cornea, crystalline의 reflection pattern을 알기 위해 matrix를 이용하여 image의 위치, size를 이론적으로 계산하였고, 3개의 light source와 reflex camera를 이용하여 reflection pattern를 측정할 수 있는 system을 만들었다. 단일 광원을 이용하여 retina에서 반사 pattern으로부터 눈의 원시 및 근시 등을 측정하였고, 2개의 광원을 이용한 reflection pattern으로부터 cornea, crystalline의 curvature를 측정하였다.

• 한국생산제조학회지
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• 제18권6호
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• pp.621-628
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• 2009

Because the Ultra-Precision Technology increase its competitiveness in the field of the design, precision of processing technology, confidence and fixation degree are major considerations. According to Pattern shapes using these processing technologies, Light Reflection has influence on the sense of sight about human being. Based on background of these studies, we draw a plan about a round workpiece using a 3D design program and analyze the effect on Light Reflection changing a pattern angle and a source of light through SPEOS program in this research. We make Pattern form as V-Shape, and compare the area distributed by Light Reflection by classifying angle into 4 and analyze changes according to a source of light. In order to measure and evaluate the data from simulation analysis we has manufactured Diamond Tool and has processed Pattern precision using a Ultra-Precision Machine. Based on the result of this study, we forecast that the field of design will achieve rapid growth due to Ultra-Precision Technology in the world market.

• 한국의상디자인학회지
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• 제13권3호
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• pp.1-14
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• 2011

A dress is commonly designed and worn as a work of art. It is developed through various ways to show the expression of our bodies with functional aspects. Light plays a role in everyday life functionally and aesthetically. We can use the light in many different ways in order to enhance the beauty of the designs. The purpose of this study is to suggest sensible designs with the active expression of light reflection. The designs are especially focused on utilizing light that shows the combination between natural human body's movement and reflection of the light. The use of reflective materials shows the character of movement when it exposes to light. The methods allow to amplify the aesthetic effects of the designs. Reflective materials were used in the resulting design to show the various effects of light by applying the movement which is artistic and aesthetic pleasing aspect for the clothing. The movement is accentuated when the wearer moves, or the air flows through the adding materials on the clothing. In addition, the beads attached to the end of the springs to show the movement of the light. The combination of the spring and the light movement resulted in a dazzling effect. I hope in the future, more studies will be conducted to further use of fiber optics and other innovative ways to use light in fashion.

• 한국광학회지
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• 제15권4호
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• pp.331-336
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• 2004

백색광주사간섭계는 금속 물질의 반사시 발생하는 위상 변화에 의해 금속의 두께 측정에서 수십 나노 미터(nm)의 오차를 갖는다. 실제로 반도체 공정이나 초 정밀가공 부품에 많이 쓰이는 금, 은, 알루미늄, 크롬 등의 금속은 약 10∼30 nm의 측정 오차를 야기 시킨다. 본 논문에서는 수치 해석을 통해 백색광의 편광을 고려한 반사시 위상 변화에 의해서 간섭무늬의 두 정점, 위상 정점과 가시도 정점이 이동함을 보인다. 또한 백색광의 두 편광성분, 수직 편광성분과 수평 편광성분에 의해 재구성된 간섭 무늬식을 제안한다.

• 한국진공학회지
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• 제17권3호
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• pp.211-214
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• 2008

Metal organic chemical vapor deposition (MOCVD)를 이용하여 사파이어 기판 위에 405 nm의 파장을 갖는 GaN light-emitting diode (LED)를 제작하였다. LED의 InGaN 활성층에서 생성되어 칩의 후면으로 향하는 광자를 전면으로 반사시키기 위하여, 사파이어 기판 후면에 반사막을 증착하였다. 반사막으로는 Al을 사용하였으며, 사파이어 기판에 대한 Al 박막의 접착력을 개선하기 위하여 사파이어 기판 후면에 Ti를 먼저 증착한 후에 Al을 증착하였다. Ti-Al 반사막을 채용한 결과, 광추출 효율이 52 % 향상되었다.

• 한국안전학회지
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• 제22권6호
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• pp.13-19
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• 2007

Diesel car's smoke measurement equipment and method were investigated based on the exhaust gas regulations. Reflection photo method and light extinction method for measuring smoke were compared under conditions of both no load mode and Lug-down 3 mode. Free acceleration mode at no load condition was used for regular inspection of diesel car, and Lug-down 3 mode was used for fine inspection of the diesel car. A correlation between no load mode and Lug-down 3 mode was investigated in this research. The smoke measured with reflection photo method was 1.5${\sim}$2 times higher than that of light extinction method The correlation coefficient between reflection photo method and light extinction method for measuring smoke was 0.83, which shows comparatively high correlation between the two methods for measuring smoke in diesel engines.

• Journal of the Optical Society of Korea
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• 제18권6호
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• pp.672-678
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• 2014

We propose a method to estimate the 3-D shape of surfaces with specular reflection, using a model of the difference in appearance between images reflected from a flat surface and a curved surface. First, we analyze the geometry of spatial reflection from a specular surface and how reflected light varies due to a curved surface. This is used to estimate 3-D shape. The proposed method is shown to be effective in experiments using illumination from spatially distributed light sources and a camera capturing the reflected light from curved, specular surfaces.