• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.7
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• pp.10-14
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• 2015

Recently, the collection of the sensor data and its analysis become important as the smart buildings equipped with the various sensors appear as a usual scene. The interconnection through the wire cable among the sensors is indispensible because of the information collections such as the temperature, the humidity, and the luminance in the rooms and the hallways for the effective management of the in-building energies. However, these interconnections through the cabling will be very costly, time-consuming, and a difficult task since they will cause some damages to the buildings. Therefore, the interconnections through the unwired connections are required in terms of the deployment effectiveness such as time and cost In this paper, the design and the short sequence operation appropriateness are confirmed through the simulation of the signal measurement system for in-building propagation characteristics based on short signature sequence and the analysis of the system characteristics based on the false alarm probability is performed thereafter.

• 한국문화재보존과학회:학술대회논문집
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• 2002.02a
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• pp.37-44
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• 2002

암석이 화학적으로 매우 불균일하기 때문에 암석에 있어서 자연적인 풍화와 인위적인 오염에서 기인한 손상을 구별짓는다는 것은 간단하지 않다. 석재의 화학적인 풍화는 스며든 빗물이나 오염먼지 등에 의해 생성된 물질의 농도변화로 표현되어 진다. 특히 벽면 표면의 두터운 검은 외각과 얇은 검은 막은 미관상으로 뿐만 아니라 암석 자체에도 큰 손상을 끼친다. 일반적으로 이런 검은 물질들은 비 등의 수분과 직접적인 접촉이 없고, 농축된 오염물질들이 쉽게 쌓일 수 있는 곳에서 찾아볼 수 있다. 천연 암석과 마찬가지로 검게 손상된 층 또한 화학적으로 매우 복잡한 체계를 갖고 있어 그 생성 원인과 메커니즘을 규명하는 것이 어려운 일이다. 이 흑색 층은 일반적으로 공기오염물질, 유기물, 철과 망간등의 유색광물의 이동과 침착의 현상에서 생성될 수 있다. 건물들의 외벽에 사용된 여러 종류의 사암과 석회암, 인조석의 표면에는 여러 풍화 손상 형태가 나타나고 있다. 특히 표면에 있는 검은 막의 성질을 알아보기 위해 화학성분을 주성분과 미량성분으로 나누어 측정하였고, 화학적인 특징을 예측하기 위해서 분석자료를 여러 통계적인 방법으로 처리하였다.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.2
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• pp.3-6
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• 2015

Recently, the collection of the sensor data and its analysis become important as the smart buildings equipped with the various sensors appear as a usual scene. The interconnection through the wire cable among the sensors is indispensible because of the information collections such as the temperature, the humidity, and the luminance in the rooms and the hallways for the effective management of the in-building energies. However, these interconnections through the cabling will be very costly, time-consuming, and a difficult task since they will cause some damages to the buildings. Therefore, the interconnections through the unwired connections are required in terms of the deployment effectiveness such as time and cost In this paper, the design and the operation appropriateness are confirmed through the simulation of the signal measurement system for in-building propagation characteristics based on signature sequence and the analysis of the collected measurement data is performed thereafter.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.1
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• pp.3-6
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• 2015

Recently, the collection of the sensor data and its analysis become important as the smart buildings equipped with the various sensors appear as a usual scene. The interconnection through the wire cable among the sensors is indispensible because of the information collections such as the temperature, the humidity, and the luminance in the rooms and the hallways for the effective management of the in-building energies. However, these interconnections through the cabling will be very costly, time-consuming, and a difficult task since they will cause some damages to the buildings. Therefore, the interconnections through the unwired connections are required in terms of the deployment effectiveness such as time and cost In this paper, the design and the operation appropriateness are confirmed through the simulation of the signal measurement system for in-building propagation characteristics based on signature sequence.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05a
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• pp.806-811
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• 1998

핵연료 피복관의 산화반응 현상은 중대사고시 원자로와 격납건물의 건전성을 위협하는 중요한 원인중의 하나이다 본 논문에서는 MELCOR에서 사용증인 Urbanic-Heidrich 상관식과 SCDAP/RELAP5/MOD3.1에서 사용중인 MATPRO-EG&G 상관식을 사용하여 산화 반응 모델이 노심손상에 미치는 영향을 울진원전3,4호기를 대상으로 MELCOR의 입력변수의 변화에 따른 민감도를 분석하였다. 분석결과, Urbanic-Heidrich 상관식이 MATPRO-EG&G상관식에 비해 핵연료 용융시작을 약 394초, 원자로 노심 하부에서의 용융물 재배치 (relocation)시작을 약 434초 가량 빨리 초래하여 사고진행에는 큰영향이 없음을 나타내고 있으나 노심하부 파손시점까지 발생한 수소량은 Urbanic-Heidrich 상관식이 MATPRO-EG&G상관식에 비해 약 1.4배정도 더 많이 발생시켜 격납건물 건전성에 대한 영향이 매우 크므로 보다 자세한 모델검토가 요구된다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.25 no.1
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• pp.57-64
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• 2012

Since a seismic exceeding design load can result in exposing radioactive material during disposal process of radioactive wastes, the repository should be designed with enough seismic margin. In this paper, a seismic fragility analysis was performed to evaluate the seismic capacity of surface facility structures. According to the analysis results, since inspection & store facility and radioactive waste facility have a rectangle geometry, the seismic capacity was differently presented about 23%~43% according to the axis of structures. The HCLPF capacity of inspection & store facility and radioactive waste facility was 0.52g and 0.93g, respectively. And it was observed that seismic capacity of radioactive waste facility was similar to that of a containment for nuclear power plants.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05a
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• pp.789-794
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• 1998

중대사고 해석 전산 코드 국산화의 필요성이 대두되고 있는 이때 우리가 개발해야 할 코드의 요건을 다음 여섯 가지로 정리하였다: 1) 종합적인 해석 코드. 2) 1차계통과 격납건물 모사 능력의 유연성, 3) 자세한 발전소 거동 모사, 4) 사용자 편의성, 5) 개선 및 새로운 모델 접목의 용이성. 그리소 6) 최신 모델 포함. 이런 관점에서 기존의 중대사고 해석코드를 분석한 결과 코드 개발의 기준 코드로 MELCOR를 선정하였다. MELCOR는 계통 모사의 유연성 때문에 상용 발전소 뿐만 아니라 앞으로 개발 계획 중인 차세대나 중소형 원자로까지도 확장이 가능하며, 상세한 열수력 기본 지배 방정식을 활용하고. 모델 분석 및 개선에 필요한 코드에의 자유로운 접근이 허용되며, 지속적인 코드 개선이 이루어져 최신 모델을 보유하고 있다. 이미 MELCOR는 상당한 수준의 결과를 예측하고 있기만. 노심 손상 모델을 개선하고 격납건물 안에서의 주요 현상 모사 모델을 추가하며. 또한 국내에서 이루어지고 있는 SONATA 실험이나 증기 폭발 실험 결과들을 MELCOR에 반영하는 것이 가급적 짧은 시간에 기술 자립을 이를 수 있는 방법으로 판단된다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.35 no.1
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• pp.35-44
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• 2022

It is essential to control the lateral displacement and differential axial shortening of the vertical elements in high-rise buildings. Recently, an outrigger or a mega structure system has been adopted to control the lateral displacement. Furthermore, to resolve the problems caused by differential axial shortening in high-rise buildings, analytical prediction and correction is often studied; however, the study on the comparisons of the lateral load resisting systems to address differential axial shortening is less. Therefore, in this paper, a 60-story RC residential building using an outrigger or a mega structure system is analyzed with a construction sequence. Moreover, differential axial shortening can result in an additional member force of structural members and failure of non-structural members. These problems caused by differential axial shortening affects the behaviors and can damage the important structure member in the high-rise buildings. Hence, the effects of the systems on differential axial shortening between the vertical elements in high-rise buildings are studied.

• Journal of Digital Contents Society
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• v.19 no.5
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• pp.899-906
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• 2018

In the entire process of disaster management, it is very significant to construct related information as well as perform quantitative assessment of damage losses with respect to minimizing the effect of disasters. Many countries have paid much attention not only to studying risk assessment methodologies including constructing inventories, hazard mapping, vulnerability assessment and direct/indirect damage loss estimation, but also to developing risk analysis tools investigated in this paper. We conducted comparison studies of representative earthquake damage risk analysis tools, and the result of this study is able to provide useful information to decision makers and researchers who can contribute to development of effective disaster management.

• The Journal of the Convergence on Culture Technology
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• v.10 no.1
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• pp.565-570
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• 2024

Recently, due to adjacent excavation work such as new buildings and common tunnel expansion concentrated around the urban railway, deformation of the underground box and tunnel structure of the urban railway built underground has occurred, and as a result, repair and reinforcement work is frequently carried. In addition, the subway is responsible for large-scale transportation, so ensuring the safety and drivability of underground structures is very important. Accordingly, an automated measurement system is being introduced to manage the safety of underground box structures. However, there is no analysis of structural damage vulnerabilities caused by subsidence or uplift of underground box structures. In this study, we aim to analyze damage vulnerabilities for safety monitoring of underground box structures. In addition, we intend to analyze major core monitoring locations by modeling underground box structures through numerical analysis. Therefore, we would like to suggest sensor installation locations and damage vulnerable areas for safety monitoring of underground box structures in the future.