• Nuclear Engineering and Technology
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• 제55권11호
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• pp.4252-4265
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• 2023

In the case of nuclear power plants near end of their design life, a reassessment of the performance of safetyrelated equipment may be necessary to determine whether to shut down or extend the operation of the power plant. Therefore, it is necessary to evaluate the level of performance decline due to degradation. Electrical cabinets, including MCC and switchgear, are representative safety-related equipment. Several studies have assessed the degradation and seismic performance of nuclear power plant equipment. Most of those researches are limited to individual components due to the size of safety-related equipment and test equipment. However, only a few studies assessed the degradation performance of electrical cabinets. The equipment of various nuclear power plants is anchored to concrete foundations, and crack in concrete foundations is one of the most representative of degradation that could be visually confirmed. However, it is difficult to find a study for analysis through testing the effect of cracks in concrete foundations on the response of electrical cabinet internal equipment fixed by anchors. In this study, using a simple cabinet model considering cast-in-place anchor in uncracked and cracked concretes, a tri-axial shaking table tests were performed and the seismic behavior were observed.

• 반도체디스플레이기술학회지
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• 제11권2호
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• pp.59-62
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• 2012

This test method covers a procedure for measuring particle removal characteristic of equipment fan filter unit(EFFU) installed inside of semiconductor process equipments, FPD manufacturing equipments and so on. Since EFFU is a combination of air filter and the assembly of fan, motor and frame, the integrity of these parts is very important for the performance of EFFU. So a conventional particle removal test method for air filters is not suitable for EFFU particle removal performance. This test method defines an evaluation method for EFFU which is installed inside an enclosed space to remove particles that are generated inside process equipment. The particle removal performance of EFFUs is usually depending on the performance of filter media and air flow rate. To understand a performance of an EFFU, the filter media characteristic, air flow rate and the integrity of EFFU parts should be considered simultaneously. This test method is intended to demonstrate the system performance of an EFFU and successfully evaluated EFFU performance characteristics.

• 한국산업융합학회 논문집
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• 제25권6_2호
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• pp.1063-1069
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• 2022

In modern industry, vacuum has grown into an indispensable industrial field. The performance of the vacuum pump in the degasser system among mud treatment system facilities was verified by a numerical analysis method. The degasser system is an equipment for removing the gas contained in the mud, and it is a work process that requires a vacuum. This study analyzed the vacuum pump performance of the degasser used in drilling for resource development of onshore and offshore plants. The vacuum pump used in the degasser system was designed with a discharge rate of 0.099kg/s. The DM(Design Modeler) program of ansys workbench 17.2 was used to modify the model of the vacuum pump used in the degasser system. And for performance analysis, CFX, which is known to be suitable for rotating system analysis, was used. Finally the performance analysis results of the vacuum pump and the prototype performance test results were compared and analyzed.

• 한국산업융합학회 논문집
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• 제22권2호
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• pp.81-86
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• 2019

Although the localization rate of shipbuilding and marine equipment goods is set to be 70 percent by 2020, but the localization rate of equipment and materials for shipbuilding and marine facilities is currently 10 to 30 percent. For Korea's Big 3 shipbuilders, which build 70 percent of the world's largest shipbuilders, localization of shipbuilding equipment and equipment is an essential factor. In particular, there is a growing need to localize equipment and materials in terms of the number of lead standards and A/S. It is expected that there will be a rapid expansion of LNG carriers in the future, and it is necessary to develop equipment and equipment materials of LNG ships. In this study, the design and manufacture of LNG vessel equipment was conducted. Design and basic performance tests of 4-inch QCDC for LNG bunkering were conducted.

• 한국기계가공학회지
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• 제19권10호
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• pp.74-80
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• 2020

Crawler-type hydraulic devices facilitate forward and backward driving of construction equipment by converting power into mechanical energy. The existing hydraulic device performance test process is time- and labor-intensive. This study aims to improve efficiency and productivity by automating the hydraulic device production performance test processes, which have been separately conducted so far. We also used SolidWorksⓇ, a 3D modeling program, and ANSYSⓇ, a structural analysis tool, for structural analysis and to verify the suitability of fixing pins required for connecting a hydraulic device to performance test equipment. Our results that employing an automated hydraulic device performance test process improves efficiency.

• 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.

• 한국가스학회지
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• 제26권4호
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• pp.18-26
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• 2022

한국 정부는 열사용기자재(산업용 보일러)의 폭발, 화재에 대한 위험과 안전한 사용 및 관리를 고려하여 에너지이용합리화법에 따라 열사용 기자재(산업용 보일러) 검사를 수행하고 있다. 이 연구는 열사용기자재(산업용 보일러)에 대한 검사 결과 데이터를 통해 안전 및 성능 취약점을 도출하는데 목적이 있다. 이 연구는 2016년 1월부터 2020년 12월까지의 열사용기자재(산업용 보일러) 불합격 검사결과인 1,249건을 조사하였다. 연구방법은 불합격률 분산 수치가 높은 보일러 타입별 불합격 사유와 검사 방법별 불합격 사유를 통계적으로 분석하는 것이다. 안전 및 성능 취약점 카테고리는 18가지로 축약되었으며, 각 카데코리별 주요 불합격 원인은 검사원들의 의견을 추가 분석하여 제안하였다. 이 연구가 열사용기자재(산업용 보일러)의 안전 및 성능 취약점을 다루는데 기초 자료가 될 것으로 기대한다.

• 한국산학기술학회논문지
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• 제10권9호
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• pp.2313-2318
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• 2009

본 논문에서는 RFID 기반 하에 발전설비를 관리할 때, 상태정보를 효율적으로 관리하기 위한 방안으로 필요한 RFID 주파수 인식 성능을 분석하였다. 제안된 논문은 모니터링 서비스에서 발전설비의 고장 상태를 진단하기 위해서, 발전설비 및 주요 자재에 부착시, 인식 성능의 최적화를 목적으로 연구되었다. 본 논문의 결과는 발전설비에 RFID를 적용하는 환경에 유용할 것으로 사료된다.

• Nuclear Engineering and Technology
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• 제55권9호
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• pp.3342-3351
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• 2023

High-density polyethylene (HDPE) pipelines in nuclear power plants (NPPs) have to meet high requirements for seismic performance. HDPE pipes have been proved to have good seismic performance, but joints are the weak links in the pipelines, and pipeline failures usually initiate from the defects inside the joints. Limited data are available on the seismic performance of butt-fusion joints of HDPE pipelines in NPPs, especially in terms of defects changes inside the joints after earthquakes. In this paper, full-scale shaking table tests were performed on a test section of suspended HDPE pipelines in an NPP, which included straight pipes, elbows, and 10 butt-fusion joints. During the tests, the seismic load-induced strain of the joints was analyzed by strain gauges, and it was much smaller than the internal pressure and self-weight-induced strain. Before and after the shaking table tests, phased array ultrasonic testing (PA-UT) was conducted to detect defects inside the joints. The locations, numbers, and dimensions of the defects were analyzed. It was found that defects were more likely to occur in elbows joints. No new defect was observed after the shaking table tests, and the defects showed no significant growth, indicating the satisfactory seismic performance of the butt-fusion joints.

• 한국정보통신학회논문지
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• 제22권9호
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• pp.1220-1227
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• 2018

항공전자장비는 항공기에 탑재되는 전자장비를 의미한다. 항공전자장비의 고장은 항공기 운용에 중대한 영향을 미칠 뿐만 아니라 조종사와 승객의 안전까지 위협할 수 있다. 이에 항공전자장비는 타 용도로 사용되는 전자장비들 보다 높은 신뢰성과 안전성을 가지도록 요구도로 규정되어 있다. 항공전자장비는 설계 초기 단계에서부터 안전과 관련된 요구사항 충족을 위해 부품 선정과 시스템 설계를 고려해야 한다. 본 논문에서는 항공전자장비의 안전성, 신뢰성 성능 분석 방법을 설명하고, 안전 요구 성능 충족을 위해 수행할 수 있는 여러 설계 개선 방법을 실제 항공전자장비 개발 사례를 들어 소개한다. 마지막으로 설계 개선된 항공전자장비의 안전 성능 수치를 재분석하고, 개선 전 값과 비교하여 제시한 설계 변경의 유효성을 입증하였다.