• 제목, 요약, 키워드: Decal

검색결과 30건 처리시간 0.039초

항공기 야시조명계통 데칼패널 개발 (The Development of Decal Panel for Night Vision Imaging System of Aircraft)

  • 권종광
    • 한국군사과학기술학회지
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    • v.6 no.2
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    • pp.35-44
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    • 2003
  • A Decal Panel is developed for the Night Vision Imaging System of XKO-1 aircraft. The Decal Panel is a kind of lighting system kits and is installed on each system switch box in crewstation. The Decal Panel consists of upper panel made of polycarbonate and lower panel which is a printed circuit board. This paper includes the design, manufacture, test and evaluation of Decal Panel in addition to items and conditions of environmental test. Besides it is confirmed the Key for manufacturing a decal panel, is depth of paint, dry time period and frequency, and diffusion material for spreading of light.

Decal Method with High Catalyst Transfer Ratio and Its Performance in PEMFC

  • Park, Hyun-Seo;Cho, Yong-Hun;Cho, Yoon-Hwan;Sung, Yung-Eun
    • 한국신재생에너지학회:학술대회논문집
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    • pp.169-171
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    • 2007
  • A breaking layer was introduced to conventional decal transfer method in membrane electrolyte assembly fabrication for high catalyst transfer ratio. In this study, the modified decal transfer method with high catalyst transfer ratio was introduced and its performance is studied. The structural features of electrodes made by decal method were investigated using scanning electron microscopy and current-voltage polarization measurement.

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데칼법을 이용한 연속 제조 공정에서의 고분자 전해질 연료전지용 전극 개발 (Development of a MEA Made by Decal Method in PEM Fuel Cells)

  • 임성대;박석희;윤영기;양태현;김창수
    • 신재생에너지
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    • v.6 no.1
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    • pp.46-52
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    • 2010
  • Membrane electrode assemblies (MEAs) for proton exchange membrane fuel cells (PEMFCs) have been extensively studied to improve their initial performance as well as their durability and to facilitate the commercialization of fuel cell technology. To improve the MEA performance, particularly at low Pt loadings, many approaches have been made. In the present study, MEA performance improvement was performed by adding $TiO_2$ particles into the catalyst layer of MEA. Most of previous studies have focused on the MEA performance enhancement under low humidity conditions by adding metal oxides into the catalyst layer mainly due to the water keeping ability of those metal oxides particles such as $Al_2O_3$, $SiO_2$ and zeolites. However, this study mainly focused on the improvement of MEA performance under fully humidified normal conditions. In this study, the MEA was prepared by decal method aiming for a continuous MEA fabrication process. The decal process can make very thin and uniform catalyst layer on the surface of electrolyte membrane resulting in very low interfacial resistance between catalyst layer and the membrane surface and uniform electrode structure in the MEA. It was found that the addition of $TiO_2$ particles into the catalyst layer made by decal method can minimize water flooding in the catalyst layer, resulting in the improvement of MEA performance.

데칼 공정을 적용한 고성능 MEA 개발 (Development of High Performance MEA by Decal Method for PEM Fuel Cell)

  • 이기섭;이재승;권낙현;황인철
    • 한국수소및신에너지학회논문집
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    • v.22 no.5
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    • pp.585-591
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    • 2011
  • This study has focused on the development of high performance membrane-electrode assemblies (MEAs) fabricated by decal method for proton exchange membrane fuel cell (PEMFC). To study the effect of ionomer contents on performance, we fabricated MEAs with several electrodes which were prepared by varying the quantity of ionomer from 20 wt.% to 45 wt.% in catalyst layer. The MEA performance was obtained through single cell test. The MEA prepared from electrode with 25wt.% of ionomer showed the best performance. We evaluated the surface area and pore volume of electrode with BET. We found that the surface area and pore volume in electrode decreased rapidly at the electrode with 40wt.% of ionomer in catalyst layer. MEA was fabricated by roll laminator machine and the roll laminating conditions for the preparation of MEA, such as laminating press, temperature and speed, were optimized. The MEA performance is not affected by laminating temperature and speed, but roll laminating press have a great effect on MEA performance.

Nafion 함량이 데칼전사기법을 통해 제작된 고분자 전해질 연료전지의 MEA 성능에 미치는 영향 (Effects of Nafion Contents on the Performance of MEAs Prepared by Decal-Transfer Method)

  • 김경희;조은애;한종희;김성현;엄광섭
    • 한국수소및신에너지학회논문집
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    • v.23 no.2
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    • pp.125-133
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    • 2012
  • Nafion ionomer located in electrode helps to increase the platinum utilization and proton conductivity. To achieve higher performance in PEMFCs, it is important an optimum Nafion content in the electrode. As the platinum loading and fabricated method depend on the optimum Nafion content. In this study, we have examined the interrelationship between platinum loading and Nafion content fabricated by decal transfer method. For electrodes with 0.25 and 0.4 mg/$cm^2$ Pt loading, best performance was obtained at 25 wt.% Nafion ionomer loading. It is also found that MEA with 0.25 mg/$cm^2$ Pt, the optimum Nafion content appears differently at low and high current density.

데칼법으로 제조된 고분자 연료전지용 전극 막 접합체의 성능평가 (enhanced performance of Membrane electrode assembly made by decal method)

  • 류성관;박석희;윤영기;이원용;김창수
    • 한국신재생에너지학회:학술대회논문집
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    • pp.65-68
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    • 2007
  • 전극 막 접합체를 만드는 방법 중 연속식 공정으로서의 데칼법의 장점은 제조공정의 단순화와 두께 균일성 그리고 대량생산 등을 그 예로 들 수 있다. 본 실험에서는 코터를 이용해 전극 막 접합체를 만들기 위해 높은 점도의 촉매 슬러리를 제조하였다. Johnson Mattey 사의 HiSPEC 40 wt% Pt/C 촉매와 Dupont사의 20 wt% Nafion Solution 그리고 물을 이용하여 촉매 슬러리를 제조한 후 코터를 이용하여 데칼법으로 전극 막 접합체를 제조하였다. 완성된 전극 막 접합체의 성능 평가를 실시하였으며 상용화된 전극 막 접합체와 그 특성을 비교 분석을 실시해보았다.

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저온 전사법을 이용한 고성능 MEA 제조 (Fabrication of membrane electrode assemblies by low temperature decal methods)

  • 조재형;김장미;;황상엽;안동준;하흥용;김수길
    • 한국신재생에너지학회:학술대회논문집
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    • pp.37-39
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    • 2008
  • 본 연구에서는 저온 데칼 전사법을 이용하여 막 전극 접합체(Membrane Electrode Assembly, MEA)를 제조하였다. 제조된 MEA는 직접 메탄올 연료 전지(Direct Methanol Fuel Cell, DMFC)를 이용하여 성능 테스트를 하였다. 저온 데칼 전사법은 $140^{\circ}C$의 낮은 온도에서 촉매 층을 데칼 기판에서 멤브레인으로 전사시키고, 전사된 촉매 층의 표면에 형성되는 것으로 알려진 이오노머 스킨 층의 형성을 막기 위해 이오노머/촉매/카본/기판의 구조로 되어 있는 데칼 기판을 사용한다. 저온 데칼 전사법으로 제조 된 카본 층이 있는 MEA의 DMFC 성능이 카본 층이 없이 데칼 전사법으로 제조된 MEA나 전통적인 고온 데칼 전사법으로 제조된 MEA, 또는 직접 스프레이 코팅법으로 제조된 MEA의 성능보다 높게 나온 것을 알 수 있다. 저온 데칼 전사법으로 제조된 MEA의 DMFC 성능이 향상된 것은 촉매 층 위에 이오노머 스킨이 형성되지 않아 반응물의 확산이 원활하게 이루어지기 때문이다. 이를 위한 특성 분석으로 EIS, CV를 측정하였다.

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탄화수소계 전해질막과 저온 전사법을 이용한 DMFC용 MEA 제조 (Fabrication of Hydrocarbon Membrane based DMFC MEAs with Low Temperature Decal Method)

  • ;;하흥용;김수길
    • 한국신재생에너지학회:학술대회논문집
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    • pp.415-417
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    • 2009
  • A low temperature decal (LTD) transfer method is tried to fabricated hydrocarbon (HC) membrane based MEA. Sandwiched structures of outer ionomer/catalyst/carbon coating/substrate, which had been developed for Nafion membrane, are used for transfer of catalyst to the HC membrane. Performances of the HC MEA before and after 500hr continuous operation are compared and it is found that a severe delamination occurs at the interface between the HC membrane and the catalyst layer, which is the main reason of the low performance and its degradation. The delamination is due probably to the different nature of HC membrane to the Nafion ionomer. A substitutional method, therefore, is suggested to overcome this. In such a way, the outer ionomer process is removed and the low transfer rate of catalyst by skipping the ionomer process is compensated with optimization of other process variables such as transfer time or temperature. The resulting performance is superior to the original LTD method, which can be explained in terms of low resistive components both in ohmic and kinetic.

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A Study on Expression Techniques of Nail Art: Focused on Nail Holic in 2012

  • Kim, Jeongmee;Jeong, Seungeun
    • 패션비즈니스
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    • v.18 no.6
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    • pp.100-115
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    • 2014
  • This study examined the history of nail art in 20th century, defined characteristics of many techniques used on nails, and analyzed how those techniques have been utilized in recent nail art works. For the method of the study, books and previous studies on nail art were examined as primary sources, and newspaper articles on nail art were studied as references. Then, the case studies were conducted on photographs of nail art works published in Nail Holic in 2012. As a result of analyzing expression techniques of nail art featured on Nail Holic, there had been a total of 517 works created using a single technique. The reason why hand painting is used very frequently is because artists can draw unique images of their own to create various designs according to their tastes. Rhine stone is also very popular, because stones are easy to apply and various in their shapes and colors. There were a total of 555 works created using two or more techniques. The most important point to examine is that hand painting, rhine stone, and 3D art were most popular among all techniques. These works featured highly various effects and images by combining flat effect of hand painting with three-dimensional effects of rhine stone or 3D art. The tendency can also be found in the fact that there have been many works using techniques of flat effects such as decal or marbling combined with techniques of three-dimensional effects such as rhine stone or 3D art.