• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2007년도 춘계학술대회 논문집
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• pp.55-59
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• 2007

Technologies of super-precision micro pattern mold machining and high-performance optical films manufacturing using thereof forms the basis of recent display industries which have developed remarkably. Especially, it is the light guide plates and high luminous intensity prism sheets at BLU or FLU in LCD and lenses at virtual keyboard's display to be manufactured by micro machining technology. One way the industry requires to do that is by developing high-performance light guide plates or films which are existing light guide plates, diffusion films and luminance enhancement prism films all in one. In this research effort, basic processing of the micro pyramid structure by shaping method is proposed. Experiments of mold machining of pitch $20{\mu}m$ tetrahedral pyramid and pitch $100{\mu}m$ trihedral pyramid using a $90^{\circ}$ diamond tool were conducted to identify a variety of machining features, such as cutting forces, conditions of the surface, shapes of chips, and influence of materials.

• Current Optics and Photonics
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• 제2권2호
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• pp.140-146
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• 2018

In this paper, mesoscale optical surface structures are found to possess both geometric and wave optics features. The study reveals that geometric optic analysis cannot correctly predict the experimental results of light transmission or reflection by mesoscale optical structures, and that, for reliable analyses, a hybrid approach incorporating both geometric and wave optic theories should be employed. By analyzing the transmission patterns generated by the mesoscale periodic pyramid prism plates, we show that the wave optic feature is mainly ascribed to the edge diffraction effect and we estimate the relative contributions of the wave optic diffraction effect and the geometric refraction effect to the total scattering field distribution with respect to the relative dimension of the structures.

• 한국분말재료학회지
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• 제22권3호
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• pp.169-174
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• 2015

The optical film for light luminance improvement of BLU that is used in LCD/LED and retro-reflective film is used as luminous sign consist of square and triangular pyramid structure pattern based on V-shape micro prism pattern. In this study, we analyzed machining characteristics of Cu-plated flat mold by shaping with diamond tool. First, cutting conditions were optimizing as V-groove machining for the experiment of micro prism structure mold machining with prism pattern shape, cutting force and roughness. Second, the micro prism structure such as square and triangular pyramid pattern were machined by cross machining method with optimizing cutting conditions. Burr and chip shape were discussed with material properties and machining method.

• Journal of the Optical Society of Korea
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• 제12권1호
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• pp.25-30
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• 2008

The optical performances of 15-inch edge-lit backlight were simulated by using a Monte Carlo ray-tracing technique. The backlight model was built by combining a wedge-type light guide plate, a diffuser sheet, a tubular fluorescent lamp with a lamp reflector, and two crossed prism sheets. Angular distributions of the luminance on each optical component obtained from simulation were consistent with those obtained from experiments on a real 15-inch backlight. The constructed backlight model was used to evaluate the optical performances of a micro-pyramid film. It was found that the on-axis luminance gain on the pyramid film is higher than that on one prism film but much lower than that on the two crossed prism films. These results suggest that a reliable simulation model can be used to develop new hybrid films and to optimize the optical structure of edge-lit backlight in order to reduce the developmental period.

• 한국광학회지
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• 제23권3호
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• pp.119-123
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• 2012

LCD backlight unit (BLU)에서 도광판 상부에 micro reverse-pyramid array (MRPA) 또는 micro reverse-cone array (MRCA)을 설치함으로써 기존의 확산 시트와 프리즘 시트를 없애고 구조를 단순화하였으며, 광학적 시뮬레이션을 통하여 새로운 도광판의 최적 조건을 얻었다. MRPA와 MRCA의 측면각과 높이, 윗변의 반지름이나 윗변의 길이에 따라 휘도와 시야각의 변화를 구하였다. MRPA와 MRCA 구조물의 최적의 형상은 측면각이 각각 59도와 57도이었으며, 시야각은 68도와 64도이었다. 구조물의 높이는 큰 영향을 주지 않았다.

• Bulletin of the Korean Chemical Society
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• 제30권9호
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• pp.2132-2134
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• 2009

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 춘계학술대회 논문집
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• pp.407-408
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• 2009

• 한국수학교육학회지시리즈C:초등수학교육
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• 제27권2호
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• pp.139-153
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• 2024

본 연구는 초등 수학 교과서와 관련하여 입체도형의 지도와 관련된 교수학적 시사점을 제시하고자 하였다. 국정 1종 및 검정 10종의 교과서를 분석하였으며 각기둥과 각뿔 단원 내 수학적 개념의 정의와 시각적으로 표현된 예시를 분석하였다. 분석 결과, 동일한 교육과정이 반영되었음에도 불구하고 수학적 개념의 정의 방법 및 내용이 다르게 나타났다. 또한, 각기둥과 각뿔을 학습하는 과정에서 다양한 형태로 표현된 시각적 예시가 제공되었다. 본 연구의 결과를 바탕으로 수학적 개념의 정의를 이해하고 학생에게 적절한 방식으로 지도할 필요가 있으며 시각적 예시를 제시하는 과정에서 각 차시의 목표 및 활동의 목표를 고려하여야 한다는 시사점을 도출하였다.

• 대한수학교육학회지:수학교육학연구
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• 제21권3호
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• pp.221-237
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• 2011

본 논문에서는 2007 교육과정에 따른 <5-1>, <6-1> 교과서에서 특정한 입체도형을 다루기에 앞서 일반적인 입체도형을 도입하고 있다는 것, <5-1>, <6-1>, <6-2> 교과서에서 구체적인 물건으로부터 입체도형을 추상해 내는 과정이 생략되어 있다는 것, 입체도형 관련 지도 내용의 몇몇 정의가 일관적이지 않고 모호하다는 세 가지에 초점을 맞추어 교과서에서의 입체도형 관련 지도 내용을 비판적으로 분석하고 있다. 이러한 논의를 바탕으로 다음의 네 가지를 제안할 수 있다. 첫째, 교과서의 지도 내용과 교육과정에서 규정하는 지도 내용을 일치시켜야 한다. 둘째, 초등교사에게 지도 내용의 범위를 지도서와 교육과정 해설서를 통해 상세히 알려줄 필요가 있다. 셋째, 교과서의 학년별 지도 내용을 재검토해야 한다. 넷째, 교과서의 상시 수정이 제도적으로 가능해야 한다.

• Journal of Information Display
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• 제9권1호
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• pp.26-32
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• 2008

The dependence of optical performances of collimating films such as prism films and pyramid films on the reflecting properties of reflection films were investigated by using a ray tracing technique. The angular distribution of the luminance and the on-axis luminance gain were obtained by using a simple backlight model composed of a reflection film, a virtual flat light source, and a collimating film. Three kinds of reflecting properties were used, which were a perfect Lambertian reflector, a perfect mirror reflector, and a reflector having both diffuse and specular properties. It was found that the on-axis luminance gain was the highest in the simulation where a mirror reflector was used, while the viewing angle was the widest where the Lambertian reflector was used. This result indicates that it is necessary to optimize the simulation condition such as the reflecting properties in order to predict the optical performances of collimating films accurately. Quantitative correlation between the optical characteristics of collimating films and the reflecting properties of reflection films can be used to improve simulation technique for the development and the optimization of collimating films for LCD backlight applications.