• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2012년도 춘계학술발표회 논문집
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• pp.296-297
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• 2012

전기 방사(Electrospinning)를 이용하여 하이브리드 태양전지용 금속 메쉬 제조에 관한 연구를 진행하였다. 금속 메쉬 제조를 위해 각종 고분자 물질을 이용한 용액에 이용하여 금속 섬유를 제조하였으며, 전기 방사된 고분자 금속 섬유는 열처리를 이용해 금속 섬유를 전환시켰다. 각각 제작된 금속 섬유의 형상 및 조성 그리고 전기적 특성을 관찰하여 금속 메쉬 제작에 영향을 미치는 각종 요인들을 분석해 보았다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.133.2-133.2
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• 2016

차세대 디스플레이로 유연하고 투명한 기능들이 요구되면서 Indium Tin Oxide(ITO)를 대체하기 위한 투명전극 개발 연구가 많이 수행되고 있다. ITO는 높은 투과도와 낮은 저항으로 현재 가장 많이 활용되고 있는 투명전극 소재이지만 유연성이 떨어져 유연 터치 패널 소재로 활용하기 어렵다. 이러한 문제 해결을 위해 ITO 대체 물질로 CNT, Graphene, Metal mesh, Ag nano wire, 전도성 고분자 등의 차세대 투명 전극 소재가 대두되고 있다. 본 연구에서는 메탈 메쉬 전극 소재로 사용하기 위해 Cu 박막 증착 시 플라즈마 표면처리를 통해 밀착력 및 저항을 개선하였다. Cu 금속 박막의 양산화를 위한 공정으로 자체 제작한 Linear Ion Source(LIS)가 부착된 roll to roll 시스템을 적용하여 플라즈마 전처리 공정 및 Ni buffer layer 도입 이후 Cu 박막을 형성하였다. 그 결과 PET 기판과 Cu 박막 사이의 밀착력을 0 degree에서 5 degree까지 향상시킬 수 있었고, 플라즈마 표면처리를 시행함으로써 저항 또한 감소되는 결과를 얻을 수 있었다. 본 연구를 통해서 폴리머 기판 소재에 in-situ로 표면처리 및 Cu 금속 박막을 증착함으로써 금속 박막의 밀착력 및 전기적 특성이 향상되는 공정 기술을 개발하였다.

• 한국환경과학회지
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• 제5권4호
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• pp.481-494
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• 1996

This study was performed to investigate the relationship between concentrations of heavy metals in sediment and the depths of 27 sampling sites along the West Nakdong river in downstream of Nakdong River. The deepest site was Kangdong bridge nearby 20ft. From here, the depth was shallowed to Chidong gradually. In each site the smaller mesh was, the liger concentration of heavy metal becomed. Concentration of Zn, Cd, Cr and Cu at inflow point of Shinoe stream was 576.016 ppm, 262.307 ppm, 68.674 ppm and 61.634 ppm, respectively, the concentration was the higest at this point. From here, it was lowered gradually. The concentration of heavy metal at inflow point of Joman river was 155.328 ppm, 56.485 ppm, 25.200 ppm and 31.172 ppm, respectively, those concentrations were liger than other points with the exception of Shinoe stream. Therefore, woman river and Shinoe stream were the major source of pollution in West Nakdong river. Among two sources Shinoe stream was more important source of pollution. West Nakdong river has become lake by Noksan floodgate because it's pollution has had influence on Bonglim.

• 한국주조공학회지
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• 제11권1호
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• pp.79-84
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• 1991

The process of solidification of metal is accompanied by liquid-solid change and known as Stefan's heat conduction problem on the moving boundary. In this study the temperature distribution in ingot and metallic mould during casting was analyzed by the two dimensional heat conduction theory. The transient temperature distribution was numerically calculated using a finite element method on the nodal point of mesh screen representing ingot and mould cross section. The theory was applied on the casting of aluminum(purity ; 99%) in flat ingot mould of GC25. The analysis will make it possible to calculate an optimum mould shape of which temperature gradient becomes minimum.

• 한국정밀공학회지
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• 제15권4호
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• pp.58-67
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• 1998

A sectional analysis of sheet metal forming process with an arbitrary tool shape is proposed in the present work. To improve the numerical convergence in the conventional membrane sectional analysis, the Bending Energy Augmented Membrane (BEAM) elements had been developed. The BEAM elements particularly improve the stability and convergence of the finite element method for the case of deep drawing. In this work, the FERGUBON spline (C$^2$-continuous) was used to fit the deformed mesh to smooth the given curves and calculate the local curvature of the deformed sheet. The fittings of the deformed sheet and tool surface profile ensure the stability and the convergence of the finite element analysis of highly nonlinear stamping processes. A center floor section and front fender section are analyzed to show the accuracy and robustness of the approach. The results obtained by the proposed approach are compared with the available experimental data.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 추계학술대회논문집B
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• pp.514-519
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• 2000

Predicting a pressure drop between inlet and outlet of the filter system is essential in designing the optimum filter system. This experiment has been carried out to investigate several design parameters which influence in a pressure drop, such as different tube length and metal fiber filter mesh size. A 1/50 scale filter system was made to simulate a real filter system. Results are compared with Darcy equation for a porous media.

• 대한화학회지
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• 제15권6호
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• pp.366-369
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• 1971

The cation exchange chromatographic method for the analysis of Babbitt metal has been studied. The quantitative separation of the mixture of Sb, Cu, Pb, and Sn ions has been obtained by elution, through 5cm column of resin, Rexyn 101 (Na form, 100~200 mesh), using 0.1 M NaCl solution for Sb, pH 4.5 and pH 7 solution of 0.01 M Na-Citrate + 0.1 M $NaNO_3$ for Cu and Pb, and 2NHCl solution for Sn as eluent.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.354-358
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• 1996

At design stage of the TRXI agricultural tractor transmission (New product of TongYang Moolsan Co., Ltd), the noise and vibration of the transmission were analyzed theoretically for the optimal design of the transmission . For this analysis, the finite element model was developed using a commercial computer software, ANSYS. The noise and vibration of the TRXI transmission housing were predicted by the modal analysis. Natural frequency of the TRXI transmission housing was ranged from 12.53Hz(1st mode ) to 30.05Hz(5th mode). The fifth mode took place at the bearing metal in the area of rear transmission housing and was very close to the gear mesh frequency (30.5Hz) of low rang gear at the low creep shifting . Based on the results , the bearing metal of the range shift housing was reenforced with the rib at design stage.

• 소성∙가공
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• 제1권1호
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• pp.95-103
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• 1992

The plane strain analysis for simulating the stretch/draw forming operation with an arbitrarily-shaped tool profile is introduced. An implicit, incremental, updated Lagrangian formulation with a rigid-viscoplastic constitutive equation is employed. Contact and friction are considered through the mesh-normal, which compatibly describes arbitrary tool surfaces and FEM meshes without depending on the explicit spatial derivatives of tool surfaces. The linear line elements are used for depicting the formed sheet, based on membrane approximation. The FEM formulation is tested in the sections of automotive inner panel and two-side draw-in. Not only the excellent agreement between measured and computed strains is obtained in the stretched section, but also the numerical stability of formulation is verified in the draw-in section.

• 동력기계공학회지
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• 제14권6호
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• pp.54-60
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• 2010

The automotive air conditioning hose is used for connecting the components of air conditioner in a vehicle. The hose is usually manufactured by the swaging process to connect the rubber hose with the metal fitting at the end of the hose. The swaging process leads to various stress and strain configurations in the hose, which give a critical effect on the hose performance. In this paper, the deformation characteristics of an air-conditioning hose during the swaging process were analyzed using the nonlinear finite element method. Especially the rubber layers, which are contacted with the metal fittings, were divided with finer mesh density than the reinforcement braids to increase the solution accuracy. The material properties were obtained from experimental data, and the contact conditions were used in consideration of the real manufacturing process.