• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1480-1481
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• 2008

In this paper, we present surface treatments for achieving bonds between PMMA and PDMS substrates. Silane primer is used for the formation of hydroxyl group on PMMA surfaces. The formed hydroxyl groups enhance the bonding strength of PDMS-PMMA substrates without channel clogging and structure deformation. The bonding strength on the different surface treatments (include oxygen plasma, 3-APTES, and corona discharge) is evaluated to find optimal bonding condition. The maximum bonding strength at the optimal surface treatment is over 300 kPa. The surface treatment using silane primer can be used to the bonding process of Micro-TAS and Lab-on-a-Chip.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 1999.11a
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• pp.95-98
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• 1999

This paper describes preliminary discussions on spatial distribution of NO density, which is mostly contained in simulated NOX exhaust, between a wire-cylinder geometry discharge gaps by using Laser Induced Fluorescence(LIF) Spectroscopy. Spatial distribution of NO density will be measured with varying NO concentrations from 166 to 644[ppm] and diameters of central electrode from 6 to 10mm. Pulsed Nd:YAG laser, Optical Parametric Oscillator(OPO), and Frequency Doubler are used to excite NO molecules to their excited state.

• Macromolecular Research
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• v.10 no.5
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• pp.273-277
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• 2002

Ultra-thin polymer films containing cobalt(II) meso-tetraphenylporphyrin(CoTPP) have been prepared by vacuum codeposition of the metal complex and trans-2-butene as an organic monomer using an inductively coupled RF glow discharge operating at 7-9 Watts. The polymer films were characterized by sorption measurements. Sorption data obtained for polymer films containing CoTPP indicate that the CoTPP molecules are capable of reversibly binding oxygen molecules. It was found that the adjacent CoTPP molecules in the aggregated metal complex phase could irreversibly share the oxygen molecules. A dispersion of the metal complex molecules in the polymer matrix was made to maintain the reversible reactivity of the metal complex molecules with oxygen in the polymer films via vacuum evaporation process. The Henry mode solubility constant, the Langmuir mode capacity constant, the amount of binding oxygen, and the dissociation equilibrium in the dual mode sorption theory were discussed.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.989-993
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• 2002

Barrier ribs in the color plasma display panel(PDP) function to maintain the discharge space between to glass plates as well as to prevent optical crosstalk. Patterning of barrier ribs is one of unique processes for making PDP. In this work photosensitive barrier rib pastes were prepared by incorporating binder polymer, solvent, functional monomers photoinitiator, mid barrier rib powder. Study on the function of materials for the barrier rib paste were undertaken. After optimization of paste formulation, both photolithographic and transparent soft molding method resulted in fine pattern of barrier ribs with high aspect ratio.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.799-802
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• 2002

For purer images in plasma display panel, a new dielectric compositions containing neodymium oxide were studied. In the present study, Pb-based compositions were used as mother glasses (PbO-$B_2O_3-SiO_2Nd_2O_3$) and thermal, dielectric, and optical properties were measured. As a result the new dielectric with a rare-earth oxide made selectively visible light penetrated and showed especially noticeable absorption properties at 585 nm that is surely related to the erroneous gas from Ne discharge. Thus, this light purple colored glass composition will help PDP to come true to get better imaging process.

• KIEE International Transactions on Electrophysics and Applications
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• v.2C no.6
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• pp.292-296
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• 2002

A new sustain driving method for the AC PDP is presented. In this driving method, the voltage source is connected to a storage capacitor, this storage capacitor charges an intermediate capacitor through LC resonance, and the panel is charged from the intermediate capacitor indirectly. In this way, the current flowing into the AC PDP when the sustain discharge occurs is reduced because the current is indirectly supplied from a capacitor, a limited source of charge. Thus, the input power to the output luminance efficiency is improved. Since the voltage supplied to the storage capacitor is doubled through LC resonance, this method call drive an AC PDP with a voltage source of about half of the voltage necessary in the conventional driving methods. The experiments showed that this charge-controlled driving method could drive ail AC PDP with a voltage source of as low as 107V. Using a panel of the conventional structure, luminous efficiency of 1.28 lm/W was achieved.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1999.11a
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• pp.42-48
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• 1999

An experimental study was performed to discover the effect of environment on the tribological behavior of Si-incorporated diamond-like carbon(Si-DLC) film slid on a steel ball. The films were deposited on Si(100) wafers from radio-frequency glow discharge of mixtures of benzene and dilute silane gases. Experiments using a ball-on-disk test-rig was performed under vacuum, dry air and ambient air conditions. It was observed that coefficient of friction was decreased as the environmental condition changes from vacuum, to dry air. It was also observed that the coefficient of friction decreased with increasing silicon concentration in the film. Chemical analyses of debris suggested that the low and stable friction coefficient is closely related to the silicon rich oxide debris and the rolling action.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.08a
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• pp.106-106
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• 2010

AC PDP(Plasma Display Panel)는 상압에 가까운 압력에서 DBD(Dielectric Barrier Discharge) 방전을 이용한 디스플레이다. AC PDP는 보통 면 방전을 이용하기 때문에 대향 방전과는 다른 방전 현상을 보인다. 본 연구에서는 4인치 test 패널 제작하여 격벽 높이 변화에 따른 방전 현상을 연구하였다. PDP 셀은 $1mm^3$ 보다 작은 크기를 가지고 있기 때문에 방전 현상을 분석하는 것은 쉽지 않다. 그래서 이 연구에서는 2, 3차원 유체 시뮬레이션을 이용하여 실험 결과에 대한 방전 현상을 연구하였다. 테스트 패널을 통하여 정적 마진, 휘도, 소비전력, 발광효율 등을 구하였고, Fluid 시뮬레이션을 통하여 전기장 분포, 하전입자 및 여기종 입자들의 개수 및 밀도 분포, 벽전하 분포 등을 통하여 방전 특성의 경향성을 분석하였다. 격벽 높이가 높아질수록 방전 공간이 넓어지면서 효율이 증가하였으나 $140\;{\mu}m$ 이상의 높이에서는 광 변환 효율이 감소하면서 효율이 오히려 감소하였다.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.02a
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• pp.490-490
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• 2012

Ballast capacitor에 저장된 에너지로 방전 에너지를 조절할 수 있는 방전장치를 개발하였다. 본 연구에서는 ballast capacitor의 용량을 조절하여 micro-size의 아크 플라즈마를 발생시켰으며, 용량변화에 따른 플라즈마의 온도를 측정하였다. 또한 ICCD camera를 이용하여 ballast capacitor의 용량변화에 따른 cathode의 변화를 관찰하였다. Optical Emission Spectroscopy를 통하여 플라즈마의 광학적 특성을 분석하였다. 마이크로 아크 방전의 주파수를 높이기 위하여 switching device를 병렬로 연결하여 아크 플라즈마를 구동시켰으며, 발생된 마이크로 아크 플라즈마는 정밀방전 가공에 응용되었다. 본 연구는 2011년도 지식경제부의 재원으로 한국에너지 기술평가원(KETEP)의 지원을 받아 수행한 연구 과제입니다(No. 20104010100670).

• 한국정보디스플레이학회:학술대회논문집
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• 2000.01a
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• pp.121-122
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• 2000

The understanding of reset scheme is essential for the driving of AC PDP (Plasma Display Panel). The characteristics of reset period of AC PDP was examined with the variation of pulse time and voltage in the ADS (Address Display Separated) driving method presented by Fujitsu,. The addressing characteristics showed drastic change as a function of the erasing time and addressing pulse width. In this paper, these results were explained by the change of wall charge variation, and it was estimated with the currents through each electrode.