• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2013.05a
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• pp.96-96
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• 2013

그래핀과 금속 결합에서 발생하는 접촉 저항을 줄이기 위한 목적으로, 소자 제작에 사용되는 $SiO_2$ 기판의 표면을 플라즈마를 사용하여 에칭하는 최적의 조건에 대해 연구하였다. 기존에 발표된 연구 결과에 따라 $SF_6$와 $O_2$를 섞어 플라즈마 처리를 하였고, 플라즈마 방전에 사용 된 두 가스의 혼합 비율을 조절함으로써 소자 제작에 적합한 조건을 찾고자 하였다. 플라즈마 처리 전후의 $SiO_2$ 기판의 표면 측정은 AFM (Atomic Force Microscope)을 사용하였고, 단면은 SEM(Scanning Electron Microscope)을 통해 확인하였다.

• Proceedings of the KIEE Conference
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• 2002.07c
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• pp.1437-1439
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• 2002

실리콘 고무는 내열성, 내후성, 발수성, 내오염성, 내트래킹성 등이 우수하여 옥외절연물용의 외피 재료로 널리 사용되고 있다. 폴리머 애자에서 전기방전 (코로나, 트래킹 등)에 의한 외피표면의 발수성 저하가 절연물의 장기성능에 있어서 가장 중요한 인자들 중에 하나이다. 실리콘 고무에는 ATH가 다량 첨가되는데 ATH의 첨가량, 표면처리상태, 입도 등에 의해 실리콘 고무의 발수성과 발수성회복 특성은 다르게 나타난다. 본 논문에서는 입도가 다른 2종의 ATH를 선택하여 실리콘 폴리머 대비 ATH의 첨가량을 달리하여 실리콘 고무의 발수성에 관련한 특성을 조사하였다. ATH의 입도 및 코로나 처리시간에 따라서 접촉각의 변화를 관찰하였으며, 코로나 처리 후 경과시간에 따른 발수성의 회복특성을 접촉각의 측정을 통하여 조사하였다.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1998.06b
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• pp.19-27
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• 1998

박판금속성형공정을 통하여 컴퓨터를 이용한 계산방법으로 효율적이고 정확하게 해석할 수 있는 박판성형해석시스템인 SAIT_STAMP를 개발하였다. 또한 이를 현업문제에 적용하여 금형의 개발기간과 비용을 줄이고 성형품 품질저하 문제들을 해결하는데 이용하였다. SAIT_STAMP 는 성형해석, 성형후해석 프로그램과 전·후 처리기로 구성이 되어있다. 금형과 재료의 접촉 및 마찰을 고려한 새로운 접촉처리방법을 성형해석에 적용하여 해석속도와 해석정확도를 향상하였고 다단계성형 및 유압성형 등 박판성형에 필요한 대부분의 기능을 개발하여 적용하였다. 성형후해석은 성형해석의 결과를 토대로 스프링백해석을 수행한다. Visual C++을 사용하여 개발된 전·후 처리기는 window 95N/T 환경의 PC에서 수행된다. 개발된 프로그램을 이용하여 현업 문제에 적용 해석하였으며 상용S/W 대비 우수한 결과를 얻었다. 현재 삼성내 9개 관계사에서 설치되어 사용중이며 프로그램의 대외신뢰성확보를 위해 대학과 비경쟁업체에 프로그램을 설치하여 프로그램을 설치하여 프로그램의 시험과 성능향상을 하고 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.489-492
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• 2011

최근 멀티-터치 디바이스에 대한 관심이 증가함에 따라서 멀티-터치 디바이스를 처리하는 시스템 프레임 워크도 같이 연구, 개발되고 있다. 본 논문에서는 기존의 멀티-터치 시스템 프레임워크와는 다른 촉각 피드백을 지원하는 비접촉식 멀티-포인팅 프레임워크에 대해서 소개할 것이다. 이 멀티 포인팅 프레임워크의 목적은 다수의 사용자가 다수의 디바이스를 이용하여, 시스템을 제어하고, 사용자의 입력에 따라서, 시스템으로부터 촉각 피드백을 받을 수 있는 소프트웨어적인 기본 환경을 제공하는 것이다. 이러한 멀티 포인팅 프레임워크를 구성하고 있는 각 파트에 대해서 살펴보고, 실제로 적용된 사례에 대해서 살펴보도록 한다.

• 전자공학회논문지 IE
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• v.44 no.3
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• pp.6-11
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• 2007

In this study, which was performed to identify a degradation mechanism in macromolecular insulating material, the contact angle, surface potential decay, surface resistance rate and XPS analysis were compared after exposure of fibre-glass-reinforced polymer laminate to plasma discharge. In the case of chemical changes arising from plasma treatment, carboxyl radicals were generated mainly in the plasma-treated surface, which was rapidly changed to a hydrophilic surface. In the corona potential decay study to determine the electrical changes, leading to a negative surface for the untreated specimen. However, in the case of the hydrophilic surface, a lot of carboxy radicals(-COO) acting as positive polarity were generated, resulting in a positive surface. Owing to such a positive surface, the charges of applied negative polarity were decreased rapidly.

• Journal of the Institute of Convergence Signal Processing
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• v.13 no.4
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• pp.201-206
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• 2012

The indirect-contact ECG measurement is a newly developed method for unconstrained and nonconscious measurement in daily life. This study introduced a new method of electrode circuit design developed for reducing the 60Hz power line noise observed at the indirect-contact ECG measurement. By the introduced common-mode-driven shielding, the voltage of the electrical shield surrounding the capacitive coupling electrode is maintained at the same as the common mode voltage. Though the method cannot reduce the level of common mode voltage itself, that reduces effectively the differential mode noise converted from the common mode voltage by the difference of cloth impedance between the two capacitive coupling electrode. The experiment results using the actual indirect-contact ECG showed that the 60Hz power line noise was reduced remarkably though the reduction ratio was smaller than the expected by the theory. Especially, the reduction ratio became large for the large difference of cloth. It is expected that the introduced method is useful for reducing the power line noise under condition of poor electrical grounding.

• Korean Journal of Plant Resources
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• v.24 no.4
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• pp.430-437
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• 2011

The epidermal recovering-effects of the Cnidium officinale extract after inducing contact-dermatitis by 1-chloro-2,4-dinitrochlorobenzene (DNCB) showed by measuring thickness of skin, identifying IgE amounts in plasma, and activities of anti-oxidant enzymes using histochemical and biochemical methods. By three-time applications of the extract, morphological changes of dermatitis in impaired region were recovered dramatically and shape of skin surface and thickness of epidermis were restored to be normal. Also, lipid content was recovered to the level of normal state. We suggested that extract treatment lowered a hypersensitive reaction by decreasing of IgE level in blood and restored activities of superoxide dismutase and catalase. In conclusion, we proposed that C. officinale extract might be used as natural resources for treating effectively allergic contact-dermatitis.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.3
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• pp.440-447
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• 2006

This study was aimed at the improvement of the effluent quality of municipal wastewater treatment plant by Oenanthe javanica and Bio-string media. The results were compared with conventional sedimentation tank and pilot sedimentation plant. In this study BOD as organic pollutants, SS, Nitrogen and Phosphorus were tested to evaluate the removal efficiencies for the advanced treatment. The result were as follow: in the Pilot Plant experiment, Tank 2 was fairly high removal efficiency as compared with Tank 1. The removal efficiency of BOD and SS in Tank 2 were as a range of $7.9%{\sim}38.8%,\;14.3%{\sim}60.0%$ and the removal efficiency of T-N, T-P were a range of $9.6%{\sim}31.5%,\;33.0%{\sim}80.0%$ respectively. The removal efficiency of T-P and SS were much higher than BOB and T-N.

• Journal of Korean Ophthalmic Optics Society
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• v.15 no.3
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• pp.207-212
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• 2010

Purpose: Rigid gas permeable (RGP) contact lenses, based on fluorosilicone acrylate, were treated with plasma in air. Methods: The chemical compositions were analyzed by using X-ray photoelectron spectroscopy (XPS), the surface morphology and roughness of RGP contact lenses were observed by using atomic force microscopy (AFM), and the wettability changes were estimated by wetting angle measurement. Results: As the contact lenses were treated by the plasma, the F contents decreased significantly, and the O and Si contents increased on the surface. The number of oxygen-containing hydrophilic radicals (C-O and Si-O) increased greatly, the hydrophobic surface decreased, and the wetting angle increased. But the C-O bonds created with exchange of the fluorine did not increase a wettability. The surface compositions were not remarkably changed for the 6 months after plasma treatment, but the wetting angle increased again. Conclusions: It was considered that the improved wettability of the RGP contact lenses of high fluorine content after plasma treatment was affected by the activation of surface, the increase of Si-O, and the decrease of hydrophobic surface.

• Journal of the Korean Applied Science and Technology
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• v.40 no.1
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• pp.71-80
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• 2023

Silver paste is a valuable electrode material for electronic device applications because it is easy to handle with relatively low heat treatment. This study treated the electrode surface using an atmospheric-pressure plasma jet on the silver-paste electrode. This plasma jet was generated in an argon atmosphere using a high voltage of 5.5 to 6.5 kV with an operating frequency of 11.5 kHz. Plasma-jet may be more beneficial to the printing process by performing it at atmospheric pressure. The electrode surface becomes hydrophilic quickly and contact angle variation is observed on the electrode surface as a function of plasma treatment time, applied voltage, and gas flow rate. Also, there was no deviation in the contact angle after the plasma treatment in the large-area sample, that means a uniform result could be obtained regardless of the substrate size. The outcomes of this study are expected to be very useful in forming a stacked structure in the manufacture of large-area electronic devices and future applications.