• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.233-233
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• 2011

건물 내부의 에너지 효율을 높이기 위해 창호의 단열 효율을 높이는 연구가 최근 큰 주목을 받고 있다. 특히 고굴절률과 저굴절률의 소재를 이용한 다층 박막 구조를 형성하여 높은 광투과율을 유지하면서도 적외선 에너지를 선택적으로 차단하는 창호의 연구가 이루어지고 있다. 본 연구에서는 고굴절률 특성을 가진 TiO2박막을 이종 금속 이온을 sol-gel법을 이용해 첨가 복합화한 후 유리 기판에 스핀 코팅후 열처리하여 성막하였다. 생성된 막은 atomic force microscopy (AFM), 전계 방출 전자현미경, UV-vis를 이용해 각각의 금속 이온에 대한 박막 표면의 형상 변화와 광학적 특성 변화를 확인하였다.

• Membrane Journal
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• v.24 no.4
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• pp.317-324
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• 2014

It is very well known that the conventional polyamide (PA) thin film composite (TFC) reverse osmosis (RO) membranes have excellent permselective properties, but their chlorine tolerance is not good enough. In this study, to improve such chlorine tolerance, microporous membranes containing hydrophilic functional groups such as -COOH were used as a support to prepare PA TFC RO membranes, employing the conventional interfacial polymerization method. Meta-phenylene diamine (MPD) and 2,6-diamine toluene (2,6-DAT) were used as diamine monomers and tri-mesoyl chloride (TMC) as an acid monomer. The membranes prepared were characterized using various instrumental analytical methods and permeation test set-up. The flux obtained from the membranes prepared so was more than $1.0m^3/m^2day$ at 800 psi of operating pressure, while the salt rejection was over 99.0%. The chlorine tolerance of them was also found to be better than that of the membrane prepared by using conventional polysulfone support without hydrophilic functional groups.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.220-221
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• 2007

금속 촉매 성장 (Metal-induced growth) 를 이용하여, 마이크로 사이즈의 결정질 (Microcrystalline) 박막 실리콘 (Silicon, Si)을 성장하였다. 금속 촉매로서는 코발트, 니켈, 코발트/니켈 복합물질(Co, Ni, or Co/Ni) 이 사용되었으며, 실리콘과 반응하여 실리사이드 (Silicide) 층을 형성한다. 이러한 실리사이드 층은 실리콘과 격자 거리가 유사하여 (Little lattice mismatch), 그 위에 실리콘 박막을 성장하기 위한 모체 (Template) 가 된다. XRD (X-ray diffraction) 분석을 통하여, 실리사이드 ($CoSi_2$ or $NiSi_2$) 의 형성과 성장된 박막 실리콘의 결정성을 연구하였다. 이러한 박막을 이용하여, 쇼트키 태양전지 (Schottky Solar cell) 에 응용하였다. 코발트/니켈 복합물질을 이용하였을 경우에 10.6mA/$cm^2$ 단락전류를 얻었으며, 이는 코발트만을 이용한 경우보다 10 배만큼 증가하였다. 이러한 실리사이드를 매개로한 박막 실리콘의 성장은 공정상에서의 열부담 (Thermal budget) 을 줄일 수 있으며, 대면적 응용에 큰 가능성을 가지고 있다.

• Journal of Advanced Navigation Technology
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• v.17 no.5
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• pp.574-580
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• 2013

In this paper, The process of thin-film coating technology was applied to improve adhesion of the hardness thin film and nitride layer. This thin-film coating technology have formed composite thin-film to gain hardness and toughness used in press mold. The thin-film coating manufacturing technology increased vacuum present in the vacuum chamber and improved the throw ratio of the gun power using physical vapor deposition coating technology. Ti alloys target improved performance and surface material through the development of a composite film coating technology for various precision machining parts.

• Composites Research
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• v.13 no.4
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• pp.75-82
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• 2000

A small diameter steel-ball impact experiment was performed to study the impact resistance of the surface of glass plates bonded with glass fabric/epoxy lamina. Five kinds of materials were used in this study: soda-lime glass plates, glass/epoxy lamina(one layer)-bonded and unbonded glass plates, glass/epoxy lamina(three layers)-bonded and unbonded glass plates. The range of impact velocity was 40 120m/s. The maximum stress and absorbed fracture energy were measured on the back surface of glass plates. With increasing impact velocity, various types of surface cracks such as ring, cone, radial and lateral cracks took place in the interior near the impacted site of glass plates. The cracks drastically decreased with glass/epoxy lamina coating. The surface fracture behavior could be evaluated using the maximum stress and the absorbed fracture energy.

• Proceedings of the Membrane Society of Korea Conference
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• 1992.10a
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• pp.49-52
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• 1992

본 연구에서는 기체분리용 고분자 분리막을 박막화하기 위하여 기체의 선택도와 투과도가 서로 상이한 celluloseacetate(CA), polyvinylchloride(PVC) 및 polystyrene(PS) 등의 고분자용액을 사용하여 수면전개법에 수면 전개기구와 박막의 구조적 특성을 연구하였고, 또한 기체 분리막으로서의 이 수면전개막을 개발하기 위하여 CA, PVC, PS 단일 적층막, CA-PVC 복합적 층막, PVC/PS 혼합적층막의 형태로 제막하여 기체분리효과를 검토하였다.

• Membrane Journal
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• v.6 no.4
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• pp.265-272
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• 1996

The (polymer/carrier) composite membranes for separating the metallic ion have been prepared by the water cast-method. The morphology of these membranes was affected by the physical properties of the spreading solution. The surface tension of the (polymer/18-crown-6) composite solution was decreased with increasing the concentration of 18-crown-6 compound and the surface tension of polymer solution decreased the following order PVC>PS>CA. The viscosity of CA solution decreased with increasing the contents of the 18-crown-6 compound, but PVC and PS solutions showed no significance changes according as the concentration of 18-crown-6 compound. In the composite solutions, the spreading ability was improved by' the cyclic 18-crown-6 molecules which acted as an electric buffer and diminished the intermolecular force between the polymer chains. The (polymer/18-crown-6) composite membrane was more uniform than that of the mono polymer membrane on the coagulation state of polymer, and the top and bottom sides of membrane showed also the more smooth structure according as the concentration increment of 18-crown-6 molecule.

• Electrical & Electronic Materials
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• v.3 no.2
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• pp.131-137
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• 1990

스퍼터링시 타겟에서 튀어나오는 원자의 방출각도분포를 새로운 함수로 표현하고 이를 이용하여 박막의 두께와 조성분초를 예측하는 방법을 구하였다. 2원계 RbFe박막의 복합타겟 마그네트론 스퍼터에 의해 제작된 박막의 조성 및 두께해석에 본 모델을 적용한 결과, 스퍼터시 Tb는 overcosine, Fe는 undercosine 방출분포를 갖는다는 것이 밝혀졌으며 이를 이용하여 실용디스크의 대면적균일화 방안의 도출기반을 마련하게 되었다.

• Proceedings of the Korean Magnestics Society Conference
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• 2011.06a
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• pp.52-52
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• 2011

• Proceedings of the Korean Ceranic Society Conference
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• 2004.10a
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• pp.95.3-95.3
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• 2004