• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.180-180
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• 2016

최근 디스플레이 시장의 주요 키워드는 flexible organic light emitting diode (OLED) 이다. OLED 소자의 수명을 결정하는 가장 큰 요인 중의 하나는 공기 중의 O2와 H2O에 의한 유기물의 열화이다. 따라서 공기 중의 O2나 H2O가 유기물에 쉽게 침투하는 것을 막는 것은 소자의 수명 향상을 위하여 필수적이라 할 수 있다[1-3]. SiNx 박막은 경질로 투과성이 우수하며, 화학적 불활성인 특성으로 이러한 Barrier 역할로 연구되어 산업분야에 다양하게 응용되고 있다[4]. SiNx 박막은 일반적으로 plasma enhanced chemical vapor deposition (PECVD) 기술을 이용하여 증착되는데 기존의 PECVD 기술을 이용한 SiNx 박막은 낮은 water vapor transmission rate (WVTR) 등의 문제점들로 인해 한계점이 들어났다. 본 연구에서는, flexible display의 thin film encapsulation (TFE) 공정에서의 적용을 알아보기 위해 $370{\times}470$ size를 증착할 수 있는 In-line 장비를 이용하였으며, 기존의 PECVD 기술의 문제점으로 지적되고 있는 낮은 WVTR을 해결하기 위하여 저온 (<$100^{\circ}C$) 선형 PECVD 기술을 이용하여 WVTR을 개선하고자 하였다. 공정가스로는 SiH4와 NH3를 사용하였으며, SiH4 Carrier 가스로 He을 추가적으로 사용하였다. 또한 공정 압력은 100mTorr를 유지하였다. 증착된 SiNx 박막의 물리적, 화학적 특성 분석을 위해 분광엘립소메타, field emission electron microscopy (FESEM), X-ray diffraction (XRD), Rutherford backscattering spectrometry (RBS) 등을 이용하여 측정하였으며, 박막에 투습되는 수분의 양은 MOCON사의 AQUATRAN 2(W)로 측정하였다. OLED 소자를 구현하기 위해서는 기본적으로 봉지층에 투습되는 양을 $10-6g/m2{\cdot}day$ 이하로 막아줘야 한다고 알려져 있으나, 기존의 PECVD 기술을 이용하여 제작된 SiNx 박막의 WVTR은 $10-2{\sim}10-3g/m2{\cdot}day$ 레벨의 WVTR 결과를 보이고 있다. 본 연구에서 사용된 저온 선형 PECVD 기술을 이용하여 제작된 SiNx 박막의 WVTR은 $5.0{\times}10-5g/m2{\cdot}day$ 이하의 개선된 결과를 확인 할 수 있었다. 또한 flexible display에 적용하기 위해 SiNx 박막의 두께를 최소화한 100nm의 두께에서도 WVTR은 $5.0{\times}10-5g/m2{\cdot}day$ 이하의 결과가 유지됨을 알 수 있었다.

• Journal of the Korean Geosynthetics Society
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• v.5 no.2
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• pp.39-44
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• 2006

The resistance of flexible PVC geomembranes to leachate chemicals is an important factor when PVC geomembranes are being considered as a barrier layer in a composite liner system. This paper describes laboratory test results that evaluate the chemical compatibility of a 0.76 mm (30 mil) thick flexible PVC geomembrane exposed to a synthetic municipal solid waste (MSW) leachate. Changes in dimensional, physical, and mechanical properties were measured after exposure to the synthetic MSW leachate at $23^{\circ}C$ and $50^{\circ}C$ for 30, 60, 90, and 120 days. Although some variability of the test results is observed due to experimental factors and product variability, the synthetic MSW leachate did not significantly degrade the physical or mechanical properties of the flexible PVC geomembrane. As a result, this paper will conclude the PVC geomembranes are not adversely affected by the synthetic MSW leachate.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.12 no.3
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• pp.139-148
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• 2000

In this paper, the interaction of oblique incident waves with a bottom-mounted and fluid-filled flexible membrane structure is investigated in the frame of linear hydro-elastic theory. The static shape of a membrane structure containing the fluid of a specific density is initially unknown and must be calculated before the hydrodynamic analysis. To solve hydrodynamic problem, the fluid domain is divided into the inner and outer region. The inner solution based on discrete membrane dynamic model and simple-source distribution over the entire fluid boundaries is matched to the outer solution ba~ed on an eigenfunction expansion method. The numerical results were compared to a series of Ohyama's experimental results. The measured reflection and tran¬smission coefficients reasonably follow the trend of predicted values. Using the computer program developed, the performance of a bottom-mounted and fluid-filled flexible membrane strocture is tested with various system parameters (membrane shape, internal pressure, density ratio) and wave characteristics (wave frequencies, incident wave angle). It is found that a bottom-mounted and fluid-filled flexible membrane structure can be an effel;tive wave barrier if properly designed.

• Journal of Fisheries and Marine Sciences Education
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• v.29 no.3
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• pp.899-908
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• 2017

The purpose of this study is to identify challenges related to social, economic and environmental change for fishing villages and suggest the developmental direction of fishing village to actively respond to new changes. This study mainly focuses on fishing village fraternities. Its current problems are summarized as follows: shortage of labor, population aging, entry barrier against newcomers, insufficient guidance and supervision functions, lack of funds of new projects and inadequate statistics and data. The fishing village community in the modern meaning of the term can be understood as an economic and flexible social-cultural community based on openness, cooperation instead of exclusiveness and closeness, which aligns fisheries with local industries. Thus, in order for the fishing village community to improve, the followings areas required. First, strengthening capacity of the fishing village community. Second, establishing the database system and the third, reorganizing the fishing village community into a sea village community.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.11a
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• pp.313-314
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• 2006

In this paper, the inorganic-organic thin film encapsulation layer was newly adopted to protect the organic layer from moisture and oxygen. Using the electron beam, Sputter and Spin-Coater system, the various kinds of inorganic and organic thin-films were deposited onto the Ethylene Terephthalate(PET) and their interface properties between organic and inorganic layer were investigated Results indicates that the SiON/PI/SiON/PI/PET barrier coatings have high potential for flexible organic light-emitting diode(OLED) application.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2001.09a
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• pp.208-211
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• 2001

Geosynthetic Clay Liners (GCLs) have been used for the applications of the hydraulic containment system in landfill due to inexpensive costs, simple workability and distinguished ability as a barrier material. However, bentonite of GCLs is easy to be damaged by the chemical solutions. Thus, there is a need to evaluate the potential susceptibility of GCLs causing Increase the hydraulic conductivity when GCLs are exposed to raw leachate and dissolved humic substances from landfill leachate. The hydraulic conductivity tests were performed with flexible-wall permeameter (the falling -headwater/rising -tailwater procedure) in order to verify the potential susceptibility of GCLs. The values of the hydraulic conductivity conducted with raw leachate as a permeant liquid increased considerably; however, The change of the hydraulic conductivity in the case of humic and fulvic acid were not worthy of notice. As the results of swelling tests of bentonite, however, humic substances can affect badly on the dispersion behavior of bentonite. These results indicate that humic substances dissolved in leachate could reduce the hydraulic conductivity of GCLs in landfill.

• Journal of The Korea Institute of Healthcare Architecture
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• v.13 no.4
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• pp.37-46
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• 2007

The rehabilitation facilities for disabled people keeps going to grow with social changes that disabled people are dramatically increasing. This paper try to provide basic concept of the architectural planning for the disabled rehabilitation facilities. To accomplish this purpose this study has analyzed the behavior pattern of user with disabilities. This study has introduced the problem of using space in the rehabilitation and welfare facilities for the disabled and the architectural concept for resolve it. The architectural planning concept appears by barrier-free accessibility, safety for mobility and use, amenity integrated the spatial cognition and flexible structural system.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.746-749
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• 2002

Aluminum oxide thin films were grown on a poly ethylene naphthalate (PEN) substrate at the temperature of 100$^{\circ}C$ using atomic layer deposition method. The film showed very flat morphology and good adhesion to the substrate. The visible spectrum showed higher transmittance in the range from 400 nm to 800 nm than that of PEN. The water vapor transmission value measured with MOCON for 230nm oxide-deposited PEN was 0.62g/$m^2$/day @ 38$^{\circ}C$, while that of PEN substrate was 1.4g/$m^2$/day @ 38$^{\circ}C$.

• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.1483-1485
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• 2009

Silicon dioxide ($SiO_2$) thin films were deposited using a modified DBD called a "pin-to-plate-type DBD" in order to generate high-density plasmas with a gas mixture of PDMS/$O_2$. The effect of the gas mixture on the physical and chemical properties of $SiO_2$ deposited by the pin-to-plate-type DBD with the mixture of PDMS/$O_2$ was investigated.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.07a
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• pp.504-505
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• 2005

In this report, we demonstrate a high performance polymer thin-film transistor fabricated on a paper substrate. As a water barrier layer, parylene was coated on the paper substrate by using vacuum deposition process. Using poly (3-hexylthiophene) as an active layer, a polymer thin-film transistor with field-effect of up to 0.086 $cm^2/V{\cdot}s$ and on/off ratio of $10^4$ was achieved. The fabrication of polymer thin-film transistor built on a cheap paper substrate is expected to open a channel for future applications in flexible and disposable electronics with extremely low-cost.