• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집D
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• pp.49-53
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• 2001

A conventional flame type gas combustion major portion of heat is transferred to the body by convection due to small radiant ability of the gas flame. Increasing the radiation component of heat flux in the combustion zone allows to augment the efficiency of gas utilization. Such effect can be reached by using radiative gas burner applied to metal mesh combustion. Basically the gas radiant burner consists of metallic mesh of high heat resisting steels. In terms of this regards, we have made the burner consisted of metal mesh and measured the radiative flame stability of natural gas/air mixture on the metal mesh burner. The pressure loss through the metal mesh is defined by pressure-velocity slope. The more increased the pressure-velocity slope of the metal mesh is, the wider the stable zone of radiave flame on the metal mesh burner is. And the augmentation of mixture flowrate through the metal mesh make narrow the permissible range of equivalence ratio.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2016년도 추계학술대회 논문집
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• pp.171-171
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• 2016

Metal mesh는 ITO를 대체한 물질의 85%를 차지하는 신소재로서 저비용 고전도도를 갖고 있어 그 활용도가 높으며, Metal mesh를 활용한 투명 LED 디스플레이는 기존 ITO 투명 디스플레이보다 유지보수가 용이하고, 자원절약뿐만 아니라 경제적이다. 따라서 본 연구는 Metal mesh가 경제적인 활용 및 시장 확대가 가능할 수 있도록 연구하는데 목적이 있다. 본 연구는 Metal mesh를 공정 상 더 쉽게 생산 가능하게 하는 Metal master를 제작하였다. 마스터의 제작 시 문제가 되는 경도를 해결하기 위해 도금액을 개발하여 적용시켰고 노광시간, 선폭, 현상시간의 조절을 통해 상호간의 영향 관계를 규명하고 최적조건을 찾아 Photolithography공정에 적용하였다. 또한 미세패턴 형성의 최적조건을 찾고 니켈 전기도금을 진행하였다. Metal mesh의 문제점인 Visibility, Moire 현상을 해결하기 위해 Metal master의 선폭을 $2.5{\mu}m$까지 낮췄으며, 그 결과, 선폭 $2.5{\mu}m$, 깊이 $8{\mu}m$, 두께 $100{\mu}m$의 Ni master를 제작하였다. 이 마스터를 이용하여 도금부터 전사하는 단계까지 도금공정의 전반적인 내용을 다루었다.

• The Journal of Advanced Prosthodontics
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• 제9권1호
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• pp.22-30
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• 2017

PURPOSE. The aim of this study was to investigate the effect of reinforcing materials on the fracture resistances of glass fiber mesh- and Cr-Co metal mesh-reinforced maxillary complete dentures under fatigue loading. MATERIALS AND METHODS. Glass fiber mesh- and Cr-Co mesh-reinforced maxillary complete dentures were fabricated using silicone molds and acrylic resin. A control group was prepared with no reinforcement (n = 15 per group). After fatigue loading was applied using a chewing simulator, fracture resistance was measured by a universal testing machine. The fracture patterns were analyzed and the fractured surfaces were observed by scanning electron microscopy. RESULTS. After cyclic loading, none of the dentures showed cracks or fractures. During fracture resistance testing, all unreinforced dentures experienced complete fracture. The mesh-reinforced dentures primarily showed posterior framework fracture. Deformation of the all-metal framework caused the metal mesh-reinforced denture to exhibit the highest fracture resistance, followed by the glass fiber mesh-reinforced denture (P<.05) and the control group (P<.05). The glass fiber mesh-reinforced denture primarily maintained its original shape with unbroken fibers. River line pattern of the control group, dimples and interdendritic fractures of the metal mesh group, and radial fracture lines of the glass fiber group were observed on the fractured surfaces. CONCLUSION. The glass fiber mesh-reinforced denture exhibits a fracture resistance higher than that of the unreinforced denture, but lower than that of the metal mesh-reinforced denture because of the deformation of the metal mesh. The glass fiber mesh-reinforced denture maintains its shape even after fracture, indicating the possibility of easier repair.

• 멤브레인
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• 제17권3호
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• pp.174-183
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• 2007

본 연구는 압연공정을 이용하여 금속망 만을 사용하여 금속막을 제조하는 과정과 금속망과 금속분말을 사용하여 금속막을 제조하는 과정에 대해 연구했다. 금속망 압연과정에서 선택된 금속망은 각각 10%, 20% 그리고 30%의 감소율로 압연했다. 이 압연공정은 망 wire의 지름을 변화시키거나 망의 단면적의 감소를 통해 망의 공경 크기를 감소시킨다. 압연된 금속망의 여과율은 압연시키지 않은 금속망의 여과율과 거의 동일한 여과율을 보였으며 금속막의 공경크기 분포 또한 더 균일했다. 금속망 위에 금속분말 층을 제조하는데 있어 분말 접합제로서 PVA를 사용하였으며 1시간 동안 $100^{\circ}C$에서 금속분말 층을 건조시키고 진공에서 3시간 동안 $1000^{\circ}C$에서 소결시키는 방법이 높은 공경 밀도와 균열이 없는 금속망 위에 금속분말 층을 형성하는 최적 조건이었다. 소결 전 30%감소율을 가지는 금속망에 대해 금속분말 층 형성에 압연공정을 적용할 경우 여과율이 약 $0.7{\mu}m$인 금속막이 성공적으로 제조되었다.

• 반도체디스플레이기술학회지
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• 제13권1호
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• pp.83-90
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• 2014

Using a ray tracing simulation, we have investigated the moir${\acute{e}}$ and starburst phenomena of touch screen panels (TSPs) based on opaque metallic grids (square, hexagonal, and random grids). It is demonstrated that employing a random metal mesh is the most effective way to suppress the moir${\acute{e}}$ and starburst phenomena at the same time. At high crossing angles between metal mesh of TSPs and black matrix (BM) of displays, however, a random metal mesh brings in stronger moir${\acute{e}}$ phenomenon than a square metal mesh due to point defects. Though the square metal mesh suppresses the moir${\acute{e}}$ effect substantially at high crossing angles, yet it results in the strongest starburst patterns. We have also provided the simulation scheme that can capture the moir${\acute{e}}$ and starburst patterns observed experimentally and useful design guidelines for metal grids.

• 한국CDE학회논문집
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• 제14권3호
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• pp.197-206
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• 2009

In a finite element analysis of the metal forming processes having large plastic deformation, largely distorted elements are unstable and hence they influence upon the result toward negative way so that adaptive remeshing is required to avoid a failure in the numerical computation. Therefore automatic mesh generation and regeneration is very important to avoid a numerical failure in a finite element analysis. In case of generating quadrilateral mesh, the automation is more difficult than that of triangular mesh because of its geometric complexity. However its demand is very high due to the precision of analysis. Thus, in this study, an automatic quadrilateral mesh generation and regeneration method using grid-based approach is developed. The developed method contains decision of grid size to generate initial mesh inside a two dimensional domain, classification of boundary angles and inner boundary nodes to improve element qualities in case of concave domains, and boundary projection to construct the final mesh.

• 한국콘텐츠학회논문지
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• 제15권10호
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• pp.10-17
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• 2015

투명 LED 디스플레이는 정보제공 서비스 및 경관연출 등을 통하여 도시민에게 다양한 볼거리를 제공하고 있으며 다양한 분야에서 수요가 증가하고 있다. 지금까지 투명전극 소재로서 ITO가 가장 많은 비중을 차지하며 사용되어 온 것은 사실이나, 경제성, 제한적 성능 등 한계로 인하여 새로운 소재를 활용한 연구와 기술개발이 지속적으로 이루어지고 있다. 그 중 메탈메쉬는 ITO를 대체한 물질의 85%를 차지하는 신소재로서 저비용 고전도도를 갖고 있어 그 활용도가 높으며, 메탈메쉬를 활용한 투명 LED 디스플레이는 기존 ITO 투명 디스플레이보다 유지보수가 용이하고, 자원절약뿐만 아니라 경제적이다. 따라서 본 연구는 투명 LED 디스플레이 기술의 경제적인 활용 및 시장 확대가 가능할 수 있도록 메탈메쉬를 활용한 LED 투명 디스플레이 Prototype을 제안하는데 목적이 있다. 이에 메탈메쉬를 활용한 투명 LED 디스플레이 개발 방법을 제시하고 이를 기반으로 Prototype을 제작하였으며, ITO와 메탈 메쉬의 특성비교 실험을 통해 투명 LED 디스플레이 개발에 있어 투명전극소재로 메탈메쉬의 활용 가능성을 제시하였다.

• 소성∙가공
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• 제15권3호
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• pp.189-194
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• 2006

In this paper, an automated adaptive mesh generation scheme, based on an advancing-front-Delaunay method, is presented fur finite element simulation of three dimensional bulk metal farming processes. Basic approach is introduced in detail, including a surface meshing and volume meshing technique and a mesh density control scheme. The presented approach is applied to automatic forging simulation in order to evaluate the effect of the developed schemes. Comparison shows a good agreement between required mesh density and generated mesh density, implying that the presented approach is appropriate for automatic mesh generation in metal forming simulation.

• 한국전기전자재료학회논문지
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• 제21권8호
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• pp.776-781
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• 2008

In this study, ubiquitous health care system attaching in chair to monitor ECG for health care was developed at the unconsciousness state. The system conveniently and simple measured ECG at non-consciousness. We measured the contact impedance to skin-electrode of metal mesh electrodes of the system. Contact impedance enable the electrode to use for ECG measurement. The results are that the impedance of the metal mesh electrodes according to sizes is low when the size is 4$cm^2$. As the result, when the size of the metal mesh electrode is 4$cm^2$, the electrode is fit for ECG measurement. We can acquired by positing the arm on the metal mesh electrode. The ECG signal was detected using a high-input-impedance bio-amplifier, and then passed filter circuitry. The measured signal transmitted to a PC through the bluetooth wireless communication and monitored. Data of the non-constrained ECG system attaching in chair is noise-data when comparing metal mesh electrode with the Ag/Agcl electrode but the data is significant to monitor ECG for check the body state.

• 마이크로전자및패키징학회지
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• 제21권2호
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• pp.1-11
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• 2014

Flexible transparent conductive electrodes (TCEs) have recently attracted a great deal of attention owing to rapid advances in flexible electronic devices, such as flexible displays, flexible photovoltanics, and e-papers. As the performance and reliability of flexible electronics are critically affected by the quality of TCE films, it is imperative to develop TCE films with low resistivity and high transparency as well as high flexibility. Indium tin oxide (ITO) has been the most dominant transparent conducting material due to its high optical transparency and electrical conductivity. However, ITO is susceptible to cracking and delamination when it is bent or deformed. Therefore, various types of flexible TCEs, such as carbon nanotube, conducting polymers, graphene, metal mesh, Ag nanowires (NWs), and metal mesh have been extensively investigated. Among several options to replace ITO film, Ag NWs and metal mesh have been suggested as the promising candidate for flexible TCEs. In this paper, we focused on Ag NWs and metal mesh, and summarized the current development status of Ag NWs and metal mesh. The several critical issues such as high contact resistance and haze are discussed, and newly developed technologies to resolve these issues are also presented. In particular, the flexibility and durability of Ag NWs and metal mesh was compared with ITO electrode.