• 마이크로전자및패키징학회지
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• 제16권3호
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• pp.45-51
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• 2009

본 연구에서는 습식 방법으로 진행 되는 BGA 현상 공정에 있어 기존의 수평 장비를 대체하여 수직 장비를 개발하였다. 지그를 이용하여 기판을 수직 방향으로 고정한 후 습식 공정을 진행함으로써 기존 수평 장비의 단점인 롤러와 기판 표면 회로 패턴의 충돌로 인한 회로 패턴 손상 문제를 원천적으로 제거하고자 하였다. 개발된 수직 장비의 공정 특성을 수평 장비와 비교 평가 하기 위하여 유니포미터 측정, 회로 패턴 손상 평가 및 불량 평가의 실험을 수행하였다. 평가 결과 수직 장비의 유니포미티 특성은 수평 장비와 동일한 수준이며 중력 방향의 액흐름에 대한 공정 특성 영향은 미미한 것으로 확인 되었다. 또한, 수평 장비 대비 $3{\sim}4{\mu}m$ 더 미세한 회로 패턴에 대해여 손상 없이 공정을 진행 할 수 있음을 확인 할 수 있었다.

• 한국응급구조학회지
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• 제26권1호
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• pp.87-99
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• 2022

Purpose: This study aimed to provide basic data for the improvement of the standards related to the performance improvement of the firefighting equipment standards for special ambulances. Methods: Among the domestic firefighting equipment standards, the special ambulance standard was compared with the NFPA 1917 standard for the United States automobile ambulance 2019 and European Union European standard EN 1789 medical vehicle and its equipment, a road ambulance. Results: Anti-skid performance based on indoor noise standards, performance standards for interior lights, seat belt warning device, child car seat fixing device, safety handle, auxiliary footrest, and flooring materials should be supplemented. Conclusion: It is necessary to strengthen the production and performance standards for improvement to a level corresponding to the national standards, such as the United States and European Union.

• 산업경영시스템학회지
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• 제33권2호
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• pp.39-47
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• 2010

Bonding glasses is one of the important PDP (Plasma Panel Display) manufacturing processes. Bonding process includes aligning front and rear glasses with fixing clips. In this process, clips have to maintain perfect alignment between the front and rear glasses. The panel which is fixed by clips goes to next process called sealing. The sealing process is performed in high temperature ($465^{\circ}C$). During sealing process, alignment is very important because it can affect seriously on the PDP screen quality. This study suggests redesigned clips to improve PDP panel alignment and also shows stabilization of clips in a high temperature during sealing process.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.1667-1671
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• 2003

A computer program to calculate properties of nitrogen is developed. Procedures for the calculation is briefly discussed. The program calculates unknown thermodynamic properties fixing the state with two independent input properties. If input value by user is inappropriate, it displays an error message and replaces the input value with an appropriate one. In addition user can change units with easy. The program developed in this work can be utilized to calculate parameters required for the simulation and design of an equipment using nitrogen.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.256-260
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• 2003

A computer program to calculate thermodynamic properties of oxygen is developed. Procedures for the calculation is briefly discussed. The program calculates unknown thermodynamic properties fixing the state with two independent input properties. If input value by user is inappropriate, it displays an error message. In addition user can change units with easy. The program developed in this work can be utilized to calculate parameters required for the simulation and design of an equipment using oxygen.

• Earthquakes and Structures
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• 제23권3호
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• pp.245-257
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• 2022

This study is a basic study on the seismic reinforcement method of anchors of fixed parts in order to reduce the effect of seismic motion that affects the facilities in the event of an earthquake. By applying the test method of ICC ES AC 156, a seismic simulation experiment was performed on the vibration table with three axes simultaneously using the number of connecting bolts between cabinets and channels as a parameter. In addition, the reliability of the experiment was verified using numerical analysis, and the part about the dynamic characteristics that could not be performed according to the experimental limit was investigated through numerical analysis. As a result of the experiment, it was confirmed that the natural frequency of the main body was increased due to the increase in the number of connecting bolts between the cabinet-channel. Accordingly, it was judged that the rigidity of the lower part of the cabinet was increased due to seismic reinforcement. It was analyzed that the impact delivered to the body was effectively reduced. In the future, if the reinforcement of the connection parts mentioned in this study is added to the existing seismic reinforcement of the electrical cabinets, it is expected that the damage to the electrical cabinets of the power plant equipment caused by an earthquake will be effectively reduced.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 추계 학술논문 발표대회
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• pp.200-201
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• 2015

The unit modular method is one in which unit modules are prefabricated at a factory and then constructed at a construction site. That is why an important process, transporting unit module, is added in this method. The purpose of this study is to analyse the load for transporting unit module. The results of the analysis of the driving experimental runs revealed that a maximum load of 15 kN was applied on adapter block type A and a maximum load of 25 kN on adapter block type B. These loads were recorded at the points in the road test when the low-bed trailer was driving through unstable sections of the test such as stopping, restarting, passing over a speed bump or taking a left turn at speed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 추계학술대회 논문집 전기설비전문위원
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• pp.3-5
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• 2008

Electricity Technology Management Act were carried out enactment in last 1995 to prevent illegal construction practices of electricity equipment, Later electricity supervision service is ordered to electricity supervision trade who register by law demarcated Dept of Architecture, Wish to investigate present condition and problem of current electricity supervision system in this treatise and present improvement plan for right fixing of electricity supervision system.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 춘계학술대회논문집
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• pp.1218-1222
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• 2006

The bolts fixing the valve cover to the engine were often reported to be failed in a wheel loader model. Recently this failures were continually repeated in the specified equipment. In order to identify the fatigue fractures of the bolts, various vibration tests were carried out. From these tests, it was found out that the failure was due to the resonance between the excitation force of engine and the transverse mode of engine valve cover. So, the several modifications for the bolts were considered to avoid the resonance. Finally, the bolt failure problem was clearly resolved.

• 미래기술융합논문지
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• 제2권4호
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• pp.1-6
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• 2023

파워인덕터 생산용 표면 UV 인쇄장치 성능 연구는 원기둥 자석의 자력 형성이 상, 하로 형성되게 제작함으로써 제품 고정 시 제품이 뒤집히거나, 세워지는 현상을 방지하는 기술을 적용하여 인쇄 진행 시 품질 소모성 자재(제판, Squeegee)의 파손을 방지하고, 인쇄 품질을 향상시킬 수 있다. 자력의 방향을 바꾼 원기둥 자석의 개발로 파우더 압축으로 제작한 메탈 소재 제품에 대한 고정 방법이 안정화 되어 소형 제품에 대한 생산 능력이 증대할 것이다. 최종적으로 원기둥 자석을 활용한 파워인덕터 표면 UV 인쇄 장치를 연구함으로써, 기존 작업 진행하던 스프레이, Deeping 방식과 차별성을 둘 수 있고, 생산량이 크게 향상될 것이며 결과적으로는 인원 감축으로 원가절감 및 경쟁력 있는 제품 생산을 할 수 있을 것이다.