• Resources Recycling
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• v.9 no.6
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• pp.53-57
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• 2000

In the present paper, a current technical progress for recycling of used steel can is described. The developed technology was a kind of pre-treatment through an automatic equipment system to increase recycling and melting efficiency of used steel co. The process consisted of several unit processes such as breaking of steel can bale, removing dust, separation of aluminum can, delacquering, and compressing to bale. Also, aluminum powders were recovered as a by-product at the delacquering step. The process was carried out automatically through by use of the developed equipment system. The automatic system could be very available in mass treatment of used steel can.

• Tunnel and Underground Space
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• v.31 no.3
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• pp.198-209
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• 2021

Recently, the demand for demolition of unnecessary steel shell structure is increasing due to deterioration and unsatisfactory functional conditions and the issue of demolition is becoming a major highlight. This execution case was intended to describe an application of the felling method, a explosive demolition method to demolish steel shell structures, for the demolition of a steel stack and steel head tank. As a result of the explosive demolition, the steel stack and steel head tank had collapsed precisely according to the estimated direction. And the explosive demolition was completed without causing any damage to surrounding facilities.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2009.05a
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• pp.144-149
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• 2009

본 논문은 스틸 파이프 생산시 저불량율, 고수율을 가진 제품을 분류하고 모형화하기 위하여 과거 스틸 파이프 생산이력을 비교, 분석하여 주요 특성들이 불량율, 수율에 어떠한 영향을 미치는가를 파악함으로써 향후 스틸 파이프 생산 공정에서 저불량율, 고수율의 제품을 생산하는데 주요한 지표로 활용코자 하는데 그 목적이 있다. 과거 스틸 파이프 산업에 대한 주요 특성별 수율 측정에 대한 연구가 미흡하였으나, 본 논문에서 이를 구체화 하여 주요 특성별 불량률과 수율이 어떠한 형태를 나타내는지를 분류하고, 그 영향정도를 구분하고자 한다.

• Bulletin of the Korea Photovoltaic Society
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• v.6 no.1
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• pp.92-99
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• 2020

스틸 보 기초 모듈러 구조체를 이용한 접지는 구조체와 대지접지(접지극) 사이 거리가 짧아 감전사고를 유효하게 방지할 수 있다. 스틸 보 기초 모듈러 구조체 접지저항 계산 결과, 제3종 접지극으로 사용하기에 충분하므로 별도의 접지극 매설 및 접지선 포설 등의 시공이 불필요하다. 결론적으로 태양광 발전설비에서 스틸 보 기초 모듈러 구조체를 이용한 접지는 기술적 및 경제적으로 보다 유리한 방식이며 태양광 발전설비의 안전하고 효율적인 운용을 보장한다.

• Journal of Korean Association for Spatial Structures
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• v.21 no.1
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• pp.12-17
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• 2021

• Journal of Korean Association for Spatial Structures
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• v.23 no.3
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• pp.4-10
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• 2023

• Journal of the Korean Society of Propulsion Engineers
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• v.16 no.5
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• pp.89-96
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• 2012

The rubber side could be contaminated using the existing pulse echo method because the ultrasonic wave was incident on the rubber side from the interior of the steel motor case, which could lead to the critical disbond defect. To develop the test method which can be replaced the existing method, the ultrasonic wave was incident on steel face of the steel/rubber adhesive test block. Rubber resonance frequencies measured from the steel/rubber adhesive test block were in good agreement with theoretically predicted rubber resonance frequencies. This paper was described about the ultrasonic resonance method to convert the rubber resonance frequency into the rubber thickness.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.137.2-137.2
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• 2010

본 연구는 스테인리스 스틸(STS)을 직접메탄올 연료전지(DMFC)용 바이폴라 플레이트에 적용하기 위한 것이다. 약산성의 연료전지 환경에서 부식저항성을 향상시키고자 오스테나이트계 STS 316L과 페라이트계 STS 430에 UBM(unbalanced magnetron) DC sputter로 CrN 코팅막을 제작하였다. CrN이 코팅된 스테인리스 스틸은 부식특성, 접촉 저항 및 접촉각 등을 측정하여 무 코팅의 스테인리스 스틸과 특성을 비교하였다. 그리고 이들 재료의 연료전지(DMFC) 적용 가능성을 알아보기 위하여 단위전지로 제작하여 연료전지 성능 등을 측정하고 평가하였다. 무 코팅 스테인리스 스틸(STS 316L, STS 430)과 CrN 코팅 스테인리스 스틸의 부식저항 특성은 동전위와 정전위 실험으로 조사하였다. 동전위 부식 실험은 -0.4~1.0 V로 0.001 M의 황산용액 또는 메탄올을 첨가하여 질소 또는 공기의 환경에서 실험을 실시하였으며, 정전위 부식 실험은 0.4 V 또는 0.6 V에서 진행하였다. 연료전지의 단전지 측정은 실제 DMFC의 운전조건에서 실시하였다. 부식실험과 단전지 실험 전/후 메탈 바이폴라 플레이트의 조직 변화는 SEM을 통해 관찰하였고, 부식산화물의 화학적 조성과 메탈 바이폴라의 표면은 EDS를 이용하여 측정하였다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2012.05a
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• pp.562-569
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• 2012

The rubber side could be contaminated using the existing pulse echo method because the ultrasonic wave was incident on the rubber side from the interior of the steel motor case, which could lead to the critical disbond defect. To develop the test method which can be replaced the existing method, the ultrasonic wave was incident on steel face of the steel/rubber adhesive test block. Rubber resonance frequencies measured from the steel/rubber adhesive test block were in good agreement with theoretically predicted rubber resonance frequencies. This paper was described about the ultrasonic resonance method to convert the rubber resonance frequency into the rubber thickness.

• Composites Research
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• v.34 no.1
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• pp.47-50
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• 2021

In this paper, the Curing process for Epoxy Molding Compound (EMC) Package was developed by comparing the performance of the EMC/Cu Bi-layer package manufactured by the conventional Hot Press process system and Carbon Nanotubes (CNT) Heater process system of the surface heating system. The viscosity of EMC was measured by using a rheometer for the curing cycle of the CNT Heater. In the EMC/Cu Bi-layer Package manufactured through the two process methods by mentioned above, the voids inside the EMC was analyzed using an optical microscope. In addition, the interfacial void and warpage of the EMC/Cu Bi-layer Package were analyzed through C-Scanning Acoustic Microscope and 3D-Digital Image Correlation. According to these experimental results, it was confirmed that there was neither void in the EMC interior nor difference in the warpage at room temperature, the zero-warpage temperature and the change in warpage.