• 한국표면공학회지
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• 제49권2호
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• pp.178-185
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• 2016

In this study, we have fabricated light guide plates (LGPs) in thin film form for edge type back light unit (BLU) by using UV imprint lithography. In the LGPs, the pattern of functional resins on PC and PMMA substrates were successfully transferred from original master mold through PVC stamp. Optimized pattern arrays with slowly-sloped density were designed to obtain high brightness and uniformity. We could obtain a relatively improved brightness of $950cd/m^2$ and a uniformity of 87.3% by using the NP-S20 functional resins at an input power of 1.3 W because NP-S20 resin could show high formability after UV hardening process. The LGP prepared on polymethylmethacrylate (PMMA) substrate exhibited higher brightness than that on polycarbonate (PC) substrate because PMMA has lower refractive index resulting in more refraction toward the vertical direction.

• 전기학회논문지
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• 제67권3호
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• pp.448-453
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• 2018

PV module protective film plays an important role in protecting the solar cell from external environment by anti-hydrolysis polyester, UV resistance and mechanical properties. The backsheet was manufactured by using Roll-to-Roll dry laminating process. The backsheet structure is composed of 3 layers, which are PE, PET, and Fluorine polymer films. In this study, we have experimented the variation of thermal conductivities depending on MgO inputs 10% to 25% in order to confirm the dependence of the module efficiencies. High thermal conductive backsheet can increase the module output power efficiency because the heat is dissipated by spreading out the internal heat. Long-term environment weatherability tests were conducted for confirming 25 year reliability in the field such as PCT, UV, and power efficiency degradations. As the evaluation result, high thermal conductivity can be effective for increase of power efficiency of solar panel by using thermal conductive MgO masterbatch.

• 대한화장품학회지
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• 제28권1호
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• pp.202-213
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• 2002

There have been a lot of research going on for developing a new blend of cosmetic ingredients. such as Porous sphere power, High functional composition power, Ultrafine power, UV sunscreen agent, Flat titanium dioxide etc. It's said that these ingredients will have multi functional effects on foundation users. Regarding foundation products. UV care effect is basic and consumers want special feelings for skin and its'transparency. People also look for a high performance foundation which helps skin stay shineless and flawless with a longlasting beautiful finish. A lot of cosmetics are produced in small quantities resulting in a greater variety depending on consumers'ages, hobbies, trends, season and environment, so more specific cosmetics should be developed. To satisfy more specific clientele, It is expected that special care product will come out. Foundations for the elderly and men are already being considered as well as ones for trans-genders are possibility. It's considered that fecundation is not a makeup but something in skin-care categories based on the development and production of high performonce foundations.

• 대한전자공학회논문지SD
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• 제41권6호
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• pp.53-58
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• 2004

광기능성 색소가 분산된 평면도파로 결합기와 측면연마된 광섬유를 이용한 자외선 센서를 제작하여 광강도 변화에 따른 감도특성을 측정하였다. 광변색성 색소인 스파이록사진이 분간된 폴리머를 평면도파로로 사용하였다. 조사되는 자외선의 강도와 시간에 의해 유효굴절률이 변화하는 성질을 이용하였다. 자외선 조사시간을 3 초와 5 초로 고정한 상태에서 자외선 조사강도를 점차 증가시켰을 때 센서감도가 자각 $1.21{\mu}W/mw$와 $2.75{\mu}W/mw$로 나타났다. 자외선 조사 강도에 따른 출력 광강도의 변화를 측정한 결과 자외선 강도가 클수록 출력 광강도도 증가하고 포화시간은 단축됨을 알 수 있었다.

• 한국안전학회지
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• 제21권5호
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• pp.28-33
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• 2006

The rapidly advanced industrial society takes advantage of high-technology, but it also suffered from the side effects such as various diseases by contamination. Of these problems, air pollution is considered as the most important problem nowadays. Air contamination is not only limited outdoors, but it also causes more serious effect in our indoor air environment. Depending on the notion that indoor air effects physical health seriously, the needs of the air cleaner is more earnest. Therefore, the main purpose of this study is to develop the air cleaner to meet the standard and get rid of poisonous and harmful material from the atmosphere by using a Corona Discharge. According to the purpose of this study, We set the negative ion generator, the UV, $TiO_{2}$ optical catalyzer, the electrical dust collector and the air filter in series order. It emits a lot of negative ions. We use these ions to purify harmful factors and contaminated materials. We collect the dust using static power that comes from the discharge of corona. At the same time, we try to develop the air cleaner to keep the air quality to meet the standard and kill the various viruses using UV LED and $TiO_{2}$ optical catalyzer. In this study, we use the UV LED that is smaller and efficient than a existing UV lamp. What is more, the UV LED has a features that a stabilizer occupying much space is not needed any more.

• Elastomers and Composites
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• 제49권3호
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• pp.210-219
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• 2014

본 연구에서는 아크릴계 점착제를 합성한 후 이소프렌 액상고무를 블렌드하여 광기능성 시트에 적용될 점착제를 제조하였다. 아크릴 점착제의 모노머로는 butyl acrylate, acrylic acid, 2-ethylhexyl acrylate, 2-hydroxyethyl methacrylate를 사용하였고 용매로는 톨루엔을 사용하였다. 고무계 모노머로는 isoprene 액상고무(LIR-50)를 사용하였고, 아크릴 점착제와의 배합량을 0 ~ 50 wt%로 하여 실험을 진행하였다. 결과에 따르면 LIR-50의 함량이 증가할수록 아크릴계 점착제의 최대 단점이었던 전사현상이 감소하였다. 그 이유는 이소프렌 액상고무의 경우 아크릴 점착제와 달리 극성기가 존재하지 않기 때문에 피착재와 이차결합이 발생하지 않아 경시변화에 따른 전사현상이 감소한 것으로 사료된다. 점착제의 자외선 경화 시 광개시제의 함량이 증가함에 따라, UV에 노출되는 시간이 증가함에 따라 점착제의 경화도가 높아지기 때문에 점착력과 전사현상이 감소하였다. 반면 유지력의 경우는 경화도가 증가하여 분자구조가 망상구조를 이루며 점착제 내부응집력이 증가하기 때문에 유지력은 증가하였다.

• 한국의류산업학회지
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• 제4권1호
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• pp.86-91
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• 2002

To estimate dispersion stability of particles, suspending power and particle size were examined as functions of pHs, surfactants, electrolytes and ionic strengths using ${\alpha}-Fe_2O_3$ particle as the model of particulate soil. Suspending power and particle size were determined by UV-Vis spectrumeter and by light scattering using the polarization ratio method, respectively. The suspending power was relatively high with polyanion electrolytes and was low with neutral salts. The suspending power was biphasis, minimum pH 6~7, and the effect of surfactant on the suspending power was insignificant. Generally suspending power increased with decreasing the particle size governed aggregation of dispersed particles regardless of solution conditions. Hence the suspending power was inversely related to the particle size.

• 한국전기전자재료학회논문지
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• 제26권2호
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• pp.164-169
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• 2013

The effect of co-sputtering condition on the structural properties of $Mg_xZn_{1-x}O$ thin films grown by RF magnetron co-sputtering system was investigated for manufacturing UV LED. $Mg_xZn_{1-x}O$ thin films were grown with ZnO and MgO target varying RF power. Structural properties were investigated by X-ray diffraction (XRD) and Energy dispersive spectroscopy (EDS). The $Mg_xZn_{1-x}O$ thin films have sufficient crystallinity on the high ZnO power. The EDS analyzed showed that the Mg content in the $Mg_xZn_{1-x}O$ films decreased from 3.99 to 24.27 at.% as the RF power of ZnO target increased. The Mg content in the $Mg_xZn_{1-x}O$ films could be controlled by co-sputtering power.

• Journal of Power Electronics
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• 제2권3호
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• pp.206-211
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• 2002

Silent gas discharge method has been widely applied fur ozone production, ultraviolet light and UV laser generation. Since ozone and ultraviolet applications have tendency to spread widely in industry, the development of efficient and low - cost power supply for such systems is an important task at present. This paper introduces high-frequency inverter type mode power supply designed fur ozone generation tube and ultraviolet generation excimer lamp and considerations on the design of the inverter and pulse density modulation control strategy applied in it.

• Journal of applied mathematics & informatics
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• 제42권2호
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• pp.445-456
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• 2024

A power cordial labeling of a graph G = (V (G), E(G)) is a bijection f : V (G) → {1, 2, ..., |V (G)|} such that an edge e = uv is assigned the label 1 if f(u) = (f(v))ⁿ or f(v) = (f(u))ⁿ, for some n ∈ ℕ ∪ {0} {0} and the label 0 otherwise, then the number of edges labeled with 0 and the number of edges labeled with 1 differ by at most 1. In this paper, we study power cordial labeling and investigate power cordial labeling for some standard graph families.