• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1997년도 제25회 춘계학술대회
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• pp.101-110
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• 1997

An experimental study was performed to discover the tribological behaviors of pure silver coated 52100 bearing steel. Pure silver coatings ranging from 80 nm to several micrometers were produced by a thermal evaporation coating method. Experiments using a thrust ball bearing-typed rolling test-rig were performed for the investigations of the influence of coating thickness on the tribological rolling behavior. The existence of optimum film thickness which revealed minimum rolling resistance was discovered. A careful analysis on the contact surfaces for the optimum film thickness has been performed. The contact patches produced by the transferred silver films played an important role for the rolling resistance to keep low.

• 전자공학회논문지A
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• 제33A권12호
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• pp.53-58
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• 1996

In this paper, a simple fabrication technique of an air-bridge for interconnection of isolated electrodes of microwave active and passive devices and MMIC's is proposed. The proposed air-bridge proceses are mainly combinations of thermal evaporation, positive photoresist and image reversal processes for easy lift-off of up to 2.0 .mu.m thick metal. According to the resutls of air-birdge processes, it is confirmed that air-gap and thickness of theair-bridge are about 3.5.mu.m, and 2.0.mu.m, respectively. And it is also possible to make the fine air-bridge with widths of 5~60.mu.m and post-intervals of 25~200.mu.m withot collapse. finally, GaAs power MESFET's and rectangular spiral inductors are fabricatd and measured in order to confirm of feasibility of the proposed air-bridge processes. The MAG of the fabricated power MESFET's is 10dB at 10GHz, and the inductance of the (200.mu. * 6 turns) rectangular spiral inductors 4.5 nH inX-band.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.355-358
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• 2008

We report a method for improving characteristics of AC PDP in this study. This improvement is obtained by spreading MgO nanoparticles on transparent dielectric layer. These nanoparticles are covered with MgO protective layer by electron beam evaporation. MgO nanoparticle has difference in cathodoluminescence stronger than MgO layer by electron beam evaporation. This method worked for reducing statistical delay especially. Efficacy, discharge voltage and luminance were also improved But these improvements has limited lifetime because continuous ion bombardments changed characteristic of MgO surface.

• 한국전기전자재료학회논문지
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• 제19권1호
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• pp.13-17
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• 2006

The one-dimensional ZnO nanostructures prepared through thermal evaporation under various cooling down procedures by changing the flow rates of the carrier gas and the reactive gas were investigated. The nanorod structures were changed into the nanonail types with a broad head through the reduction of the flow rate of the carrier gas. The decrease of the reactive gas reduced the length of the nail heads due to the limited mass transport of reactive gas. The intensity ratio of the ultraviolet emission/green emission of photoluminescence was proportional to the length of the broad head showing a larger surface area. The vertically aligned nanostructures were grown along the [0001] direction of ZnO regardless of the aligned directions. The crystal direction of the nanostructures was determined by that of the initial ZnO crystal.

• Carbon letters
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• 제11권2호
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• pp.127-130
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• 2010

Boron doped fullerene $C_{60}$ ($B:C_{60}$) films were prepared by the thermal evaporation of $C_{60}$ powder using argon plasma treatment. The morphology and structural characteristics of the thin films were investigated by scanning electron microscope (SEM), Fourier transform infra-red spectroscopy (FTIR) and x-ray photo electron spectroscopy (XPS). The electrochemical application of the boron doped fullerene film as a coating layer for silicon anodes in lithium ion batteries was also investigated. Cyclic voltammetry (CV) measurements were applied to the $B:C_{60}$ coated silicon electrodes at a scan rate of $0.05\;mVs^{-1}$. The CV results show that the $B:C_{60}$ coating layer act as a passivation layer with respect to the insertion and extraction of lithium ions into the silicon film electrode.

• 대한기계학회논문집
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• 제10권1호
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• pp.150-156
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• 1986

본 논문에서는 열전달을 포함한 사이클 해석의 좀 더 실제적인 경우로서, 주어진 연소가스로부터 랜킨사이클을 사용하여 동력을 추출할 때 최대의 출력을 추출하기 위한 사이클의 운전조건을 고찰하고, 대표적인 랜킨 사이클에 대하여 여러가지 운전조건에 따른 출력등을 계산하여, 그 결과를 고찰하였다.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1997년도 제26회 추계학술대회
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• pp.51-58
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• 1997

An experimental study was performed to discover the tribological behaviors of pure tin and zinc coated 52100 bearing steel. Pure tin coatings ranging from 30 nm to 30,000 nm and pure zinc coatings ranging from 500 nm to 52,000 nm were produced by a thermal evaporation coating method. Experiments using a thrust ball bearing-typed rolling test-rig were performed for the investigations of the effect of coating thickness on the tribological rolling behavior. Results showed that the existence of optimum film thickness which revealed minimum rolling resistance was discovered for tin and zinc coating. The compatibility of coating matehal to iron showed no significant effect on the rolling resistance behavior. The hardness of coating material revealed significant influence to the rolling resistance behavior.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.1275-1276
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• 2008

In this study, a micro-cavity organic light-emittingdevice (OLED) with semi-transparent-Ag/AgO hole injecting layer (HIL) was fabricated and their performance was investigated. For the fabrication of OLEDs N,N-diphenyl-N,N-(3-methyphenyl)-1,1-biphenyl-4-4-diamine (TPD), known as a hole transporting material and tris (8-hydroxyquinolinato)-aluminum ($Alq_3$) as both electron-transporting layer (ETL) and emission layer (EML) were deposited using thermal evaporation technique. And Al layer as cathode was then deposited using thermal evaporation technique. Effects of the semi-transparent-Ag/AgO layers on the resulting OLED performance were investigated.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2001년도 제34회 추계학술대회 개최
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• pp.27-34
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• 2001

A new functionally gradient metal coating method using an atomic mixing technique was developed. In this work the effect of silver atomic mixing on the tribological characteristics of silver$.$ films. has been investigated experimentally. Atomic mixing was implemented by using the, bombardment .of accelerated Ar ions during the thermal evaporation coating process of silver films. Experiments were performed in dry conditions using a ball-on-disk test rig at a load range of 19.6 mN - 17.64 N and a sliding velocity of 20 mm/sec. Results showed that the life of functionally gradient silver coating was enhanced about 100 times more than that of thermally evaporated silver coating and 2 times more than that of IBAD silver coating. The functionally gradient. film also showed low friction and wear compared to those of the evaporated silver and

• 한국결정학회:학술대회논문집
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• 한국결정학회 2002년도 정기총회 및 추계학술연구발표회
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• pp.17-17
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• 2002

Time-of-flight impact collision ion scattering spectroscopy (TOF-ICISS) was applied to study the geometrical structure of the epitaxially grown BaTiO₃ layers on the MgO(100) surface. Hetero-epitaxial BaTiO₃ layers can be deposited by the following steps: first thermal evaporation of titanium onto the MgO(100) surface in the atmosphere of oxygen at 400℃, secondly thermal evaporation of barium in the same manner, and finally annealing at 800℃. Well ordered perovskite BaTiO₃ was confirmed from the ICISS spectra and reflection high electron energy diffraction (RHEED) patterns. It was also revealed that BaTiO₃ had cubic structure with the same lattice parameter of bulk phase.