• Journal of Conservation Science
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• v.27 no.4
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• pp.371-380
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• 2011

For studying of the characteristics and structures of material in lacquer layer in Joseon Dynasty, 6 types and 7 pieces of sample were observed with the optical microscope and the polarizing microscope. For analyzing, SEM-EDS and FT-IR were used and TOF-SIMS was also used on trial. The former is directly varnished on the iron layer so the sample includes more iron component than the others. In the results of the trial analyzing in TOF-SIMS, it is possible to verify the minerals on the foundation layer with the infinitesimalsample. The analysis results of lacquer layer with FT-IR are compared with previous studies and all the samples have the spectrum of the lacquer. Through the result of the Joseon lacquer layer, there are not many samples, however, when it compared with unified Silla, the period of the Three States, and the previous era, the lacquer layers are simpler than the relics from previous era. It looks to have the relation with the simplification of manufacturing method because of expanding of the using of lacquer wares.

• International Journal of Highway Engineering
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• v.5 no.2 s.16
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• pp.15-24
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• 2003

The performance of waterproofing system (WPS) is known to be a function of many complex interaction of material factors, design details, and the quality of construction, but it is mainly determined by the bond strength, which is measured by tensile adhesive strength (TAS) test. to the concrete bridge deck. In this research, eight waterproofing membranes were selected from commercial market and the tensile adhesive characteristics of the WPS on concrete bridge deck were investigated in view of various factor in asphalt pavement. The factors include type of asphalt mixture, pavement thickness, paving temperature and influence of wheel loading. TAS test of different asphalt pavement types showed that TAS of WPS under SMA (Stone Mastic Asphalt) pavement was greater than that under dense asphalt pavement. TAS of sheet membranes was improved as the compaction temperature of asphalt concrete increase, but TAS of liquid membranes were not. The influence of thickness of pavement val minimal with given laboratory test condition. TAS of sheet membranes after wheel tracking test were in the order of the sites under wheel path (UWP), before wheel tracking (BWT) and nearby wheel path (NWP). Since TAS of the same WPS of UWP was higher than TAS of BWT, wheel loading had function of pressing WPS resulting in higher adhesive strength. But liquid membranes were variable on types. The feature of detached interface after TAS test showed that sheet types were all detached in between deck concrete and WPS, and liquid types were detached in between asphalt pavement and WPS.

• Journal of Conservation Science
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• v.32 no.2
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• pp.109-121
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• 2016

Mother-of-pearl turtle shell lacquerware refers to a decoration made of a mother-of-pearl, a turtle shell and metal wires. This lacquerware features bright color tone as it is produced by sprinkling metal powder over its entire surface. This study aimed to find out its material properties and characteristics by using an optical microscopy and conducting a SEM-EDS analysis on the cross section of lacquer coating. As a result, it was found that charcoal powder and soil powder were mixed for undercoating. Then a mixture of cinnabar lacquer and monoclinic arsenic sulfide mineral ($As_2S_3$) was coated on the undercoating and brass powder was sprinkled on top of it. Especially, a little amount of pigment was found on the lacquer layer, which is distinguished from the colors used for conventional lacquer patterns. In addition, it was also found that the cinnabar lacquer and monoclinic arsenic sulfide mineral were mixed together.

• Journal of Welding and Joining
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• v.2 no.2
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• pp.22-28
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• 1984

$CO_2$ 용접은 50년 중반경에 실용화되어 조선물량의 증가와 더불어 발전해 왔다. 당사(대우조선)에서는 81년 CO$_{2}$ 용접기를 도입한 이래 84년 초부터 $CO_2$ 용접법의 확대 보급을 목적으로, 페인트가 용접성에 미치는 영향을 연구하였다. 유기페인트와 무기페인트 등 페인트 종류를 달리했을 때 용접결함의 발생정도, 도막 두께를 달리했을 때 결함의 원인 중 가장 크게 영향을 미치는 용접결함의 발생 정도, 기타 용접조건에 따른 용접결함의 발생정도를 실험을 통하여 연구하였다. 연구 결과에 의하여 당사에서는 무기페인트의 사용이 권장되고 있다.

• Polymer(Korea)
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• v.26 no.2
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• pp.193-199
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• 2002

The dichloro-polyester polyol (DCBAO) which was synthesized in our earlier work was cured at room temperature with two different type of curing agents including Desmodur N-3300 and Desmodur L-75 to get a polyurethane flame-retardant coatings (DCBAO/N-3300=DEBAN and DCBAO/L-75=DCBAL). We could not observe any deterioration of physical properties of the flame-retardant PU coatings (UCBAN and DCBAL) in comparison with the conventional PU coatings. Thermal resistance of DCBAL-type flame-retardant coatings, which was measured by yellowness index difference, was inferior to that of DCBAL-type PU coatings. We believe that this phenomena is attributed to the poor thermal resistance of Desmodur L-75 isocyanate. It was observed that the LOI values were 25∼26% for the PU coatings containing 20∼30 wt% of 2,4-dichlorobenzoic acid.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.13 no.5
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• pp.241-246
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• 2003

The transparent conducting thin film of ATO (antimony-doped tin oxide) was successfully fabricated on$SiO_2$/glass substrate by a sol-gel dip coating method. The crystalline phase of the ATO thin film was identified as SnO$_2$ major phase and the film thickness was about 100 nm/layer at the withdrawal speed of 50 mm/minute. Optical transmittance and electrical resistivity of the 400 nm-thick ATO thin film which was annealed under nitrogen atmosphere were 84% and $5.0\times 10^{-3}\Omega \textrm{cm}$, respectively. It was found that the $SiO_2$ layer inhibited Na ion diffusion and the formation of impurities like $Na_2SnO_3$ or SnO while increasing Sb ion concentration and higher ratio of $Sb^{5+}/Sb^{3+}$in the film. Annealing at nitrogen atmosphere leads to the reduction of $Sn^{4+}$ as well as $Sb^{5+}$ resulting in decrease of the electrical resistivity of the film.

• Applied Chemistry for Engineering
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• v.16 no.3
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• pp.449-455
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• 2005

Electron beam (EB) and ultraviolet (UV) curable monomers (AF-1 with mono functionality and AF-2 with tetra functionality) containing hydroxy and acrylate group for anti-fogging coating were synthesized and applied to EB and UV-curable coating systems. The synthesized reactive AF-1 and AF-2 monomers were first formulated into UV-curable system and the optimization of film properties for anti-fogging coating was investigated. The 5:17.5 ratio for AF-1 and AF-2 was found to be the best optimized formulation for anti-fogging coating without destroying the other essential properties such as hardness, solvent resistance, and adhesion. The optimized formulation was applied to the EB-curable system, and EB and UV-curable systems were compared. The results demonstrated that both EB and UV-cured films coated on PC sheet showed excellent anti-fogging properties; however, the EB-cured film exhibited better hardness, adhesion, and water repellent properties than the UV-cured film.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.613-616
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• 2008

This study is about appling non-exposure waterproofing method which combines the Cement Polymer Modified Waterproof Membrane coating and Selfadhesive Rubberized Asphalt sheet to the Roof Structure, Because there are a lot of problems in previous methods. So We had the performance tests using waterproofing method which combines two materials, and we analyzed the results. This study showed us very important results. We had bond strength test and tensile test under high, normal and low temperature, and the results were successful. And we also tested for coping with crack and movement. We found that tested materials were safe in those conditions. I think that Non-Exposure waterproofing method which combines the Cement Polymer Modified Waterproof Membrane coating and Selfadhesive Rubberized Asphalt sheet is available to concrete structure.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.7 no.4
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• pp.68-75
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• 2008

This paper investigates the correlation between surface roughness and gloss of aluminium sheet painted waterborne paint. One customer criterion of automotive quality is the as-painted appearance of the final products. Especially, the current emphasis on control of surface roughness of sanded aluminium sheet has been prompted by the automotive industry's concern with the as-painted appearance. because the influence of such characteristics on paintability, and painted appearance is important in defining outer panel requirements for automobile. This paper is dedicated primarily to the issue of painted appearance and reviews for improvement of roughness. The conclusions are obtained as follows ; 1) Painted aluminium sheet appearance is strongly affected by surface roughness of base-metal and influenced by sand paper and sanding method. 2) The painted appearance of aluminium sheets was determined and related to surface roughness parameters, combination of sand paper.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.316-316
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• 2013

GZO/Ag/GZO 다층 투명 전도막은 투명 산화물 전극 사이에 빛이 투과할 수 있는 수준의 매우 얇은 금속을 삽입하여 낮은 면저항과 높은 투과율을 구현하는 기술로 금속의 유연성과 낮은 비저항, 산화물은 높은 투과도와 안정성을 동시에 이용할 수 있는 투명전도막이다. 본 연구에서는 RF 마그네트론 스퍼터와 전자빔 증착을 이용하여 GZO 박막 사이에 Ag 박막을 삽입한 GZO/Ag/GZO 구조의 박막을 제작하였다. Ag 박막의 두께와 공정 압력이 박막에 미치는 영향을 연구하였으며, 급속 열처리에 따른 GZO/Ag/GZO 박막의 특성을 분석하였다. Ag 삽입 박막 두께와 GZO/Ag/GZO 박막의 열처리 온도 최적화를 통하여 $2.2{\times}10-5{\Omega}{\cdot}cm$의 가장 낮은 비저항과 88.9%의 투과율을 나타내었다.