• Journal of the Korea institute for structural maintenance and inspection
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• v.12 no.1
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• pp.73-80
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• 2008

Experimental study has been performed in order to construct the standard test methods and appraisal criteria by investigating the influence of specimen types(property, width, layers) and loading rate on the tensile characteristics of FRP used in strengthening RC structures. The FRP composite tested in this study are the unidirectional CFRP sheet/strip and the bidirectional GFRP sheet. Test variables consist of the various width ranging from 10mm to 25mm and number of CFRP sheets plied up to 5 layers. Test results indicated that maximum tensile strength and minimum coefficient of variation are recorded at each different width according to the fiber types and weaving directions. Also, the average tensile strengths of CFRP sheets are decreased as the number of layer of CFRP sheet are increased.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1995.04a
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• pp.73-80
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• 1995

본 연구에서는 범용 구조해석 프로그램인 NASTRAN을 이용하여 실위성용 복합소재 태양전지판 구조물의 유한요소 모델링을 통해 진동특성에 대한 해석을 수행하였으며, 진동 특성 측정용 치구를 제작하고, 측정센서의 질량이 미치는 영향을 해석적인 방법으로 분석하였으며, 진동특성 측정시험을 수행하였다. 최종적으로 해석결과를 시험결과와 비교하므로써 태양전지판 구조물의 진동특성 시험방법을 정립하고 모델링기법을 검증하였다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.13 no.2 s.54
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• pp.189-198
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• 2009

In this paper, the performance of bridge health monitoring system(BHMS) installed in suspension bridge was tested and the field loading tests have been done by using BHMS to get quantitative results on the response of bridge. Before the field tests, globally structural analysis was performed to verify and estimate the test results and the static and dynamic field loading tests were carried out. Depending on comparison with results of field tests and structural analysis, field tests results were evaluated as 30%~50% less than structural analysis results, so it was confirmed that the bridge has excellent structural performance. Therefore field test results were measured within an acceptable error range, so it is verified that the BHMS in the bridge has been reliable and efficient.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.299-300
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• 2019

본 논문에서는 MVDC(Medium-Voltage DC) 차단기의 성능평가를 수행하기 위해 사용되는 단락 시험 설비의 새로운 구조를 제시한다. 단락 시험 설비는 직류 고전압과 고전류를 발생시키고 이러한 조건에서 차단기의 개폐 성능을 검증한다. 고전압과 고전류를 단일 회로로 합성하는 구조의 경우, 단락 시험 설비의 규모와 전력용량이 매우 크다. 제시하는 단락 시험 설비는 별개의 회로인 고전류원과 고전압원으로 구성된다. 각 회로에서 직류 고전압과 고전류를 발생시켜 단락 시험을 수행하는 구조이다. 제시하는 단락 시험 설비의 구조와 동작 원리를 설명하고 시뮬레이션 분석을 통하여 그 성능을 검증하였다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.19 no.4 s.74
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• pp.325-335
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• 2006

In this paper, flexural test, girder-connection test and barrier-connection test for the pultruded composite bridge deck of hollow section, were carried out and its structural characteristics were evaluated. In the flexural test specimen, deflection was measured at center of the span and strains were measured at various locations to see the structural behavior up to the failure. In addition, finite element analysis was performed for the flexural test specimen and the results were compared with experiments, and load carrying capacity was evaluated. Also, field load test was conducted for the demonstration plate girder bridge and other field applications were described.

• Journal of the Korean Society for Railway
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• v.12 no.4
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• pp.518-525
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• 2009

This paper describes the evaluation of structural performance test and finite element analysis to verify the design of Bimodal Tram made of sandwich composites. The sandwich composite applied to vehicle structure was composed of a aluminum honeycomb core and WR580/NF4000 glass fabric/epoxy laminate composite facesheet. The load tests of vehicle structure were conducted for vertical load, compressive load, torsion and modal analysis according to JlS E 7105. The structural Integrity of vehicle was evaluated by the measurement of displacement, stress and natural frequency obtained from dial gauge, strain gauge and gravity sensor, respectively. And finite element analysis using ANSYS v11.0 was done to compare with structural test. The results showed that the displacement, stress and natural frequency were in an good agreement with those of structural analysis using the proposed finite element models.

• Proceedings of the KIEE Conference
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• 1999.11c
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• pp.712-714
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• 1999

신규 광대역 멀티미디어 서비스를 효과적으로 제공하기 위한 새로운 망구조 및 전승기술들이 도입되면서, 이러한 시설들 관리할 새로운 시스템들이 요구되고 있다. 본 논문에서는 비대칭 디지털 가입자망을 유지보수관리하기 위한 전산화 방안에 대하여 기술한다. 먼저 성능 감시 및 감독을 위한 객체를 분석하고 이를 바탕으로 시험 관리시스템 및 시험 드라이버의 구조 및 기능을 설계한다. 마지막으로 시험 통신 프로토콜을 정의하고 시험응답의 예를 통한 정보요소 내용을 기술한다.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.05c
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• pp.33-38
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• 1996

영광 3,4호기용 원전연료에 사용되는 구조용 부품들 중에서 coil형 Holddown spring을 포함한 Upper end fitting assembly, Lower end fitting 등을 국내에서 제조할 수 있는 제조공정이 대우 정밀(주)에서 개발되었다. 이 공정에서 제조한 시제품들에 대하여 기계/구조적인 설계 관점에서 요구되는 제 조건들의 만족 여부를 구조강도 및 특성시험을 통하여 검증하였다. 검증시험 결과 주조제품인 Holddown plate 및 Lower end fitting은 주조물에서 요구되는 제기준과 기계/구조적인 설계 관건에서의 구조적 강도요건을 만족하고 있었고 coil형 Holddown spring의 특성이 설계 요구범위내에 있음이 확인됨으로서 향후 생산될 원전연료에는 금번에 개발된 공정으로 제조될 부품들이 사용필 수 있으리라 전망된다.

• Journal of the Korea Society of Computer and Information
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• v.13 no.4
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• pp.87-95
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• 2008

In this paper, we developed a selectable observation Point test architecture and test procedure for clocked 4-bit synchronous counter circuit based on boundary scan architecture. To develope, we analyze the operation of Sample/Preload instruction on boundary scan architecture. The Sample/Preload instruction make Possible to snapshot of outputs of CUT(circuit under test) at the specific time. But the changes of output of CUT during normal operation are not possible to observe using Sample/Preload in typical scan architecture. We suggested a selectable observation point test architecture that allows to select output of CUT and to observe of the changes of selected output of CUT during normal operation. The suggested a selectable observation point test architecture and test procedure is simulated by Altera Max 10.0. The simulation results of 4-bit counter shows the accurate operation and effectiveness of the proposed test architecture and procedure.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.36 no.9
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• pp.1087-1094
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• 2012

This study deals with structural analysis and testing under loading conditions calculated by computational fluid dynamics for a small composite blade that is utilized in a dual rotor wind turbine system. First, the aerodynamic forces were analyzed at the rated and cutout wind speed to identify the bending moment distribution along the blade length in previous research. Then, full-scale structural tests were conducted according to IEC 61400-2 to evaluate the structural integrity of the composite blade. These results were compared with finite element analysis to identify the accuracy of the structural analysis. Based on these results, it was revealed that the existing blade has a very high safety margin. Then, the layup of the composite blade was redesigned and analyzed using finite element analysis to achieve structural integrity and economic efficiency.