• 한국안전학회지
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• 제22권4호
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• pp.20-25
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• 2007

Instrument transformers are a safe measurement device designed to measure high voltage and large current. A current transformer(CT) is a type of instrument transformer designed to provide a current in its secondary winding proportional to the current flowing in its primary. It is commonly used in metering and protective relaying in the electrical power industry where it facilitates the safe measurement of large current. But, care must be taken that the secondary of a current transformer is not disconnected from its load while current is flowing in the primary, as this will produce a dangerously high voltage across the open secondary, and may permanently affect the accuracy of the transformer. Especially, industrial disaster such as an electric shock and/or a burn accident occurs occasionally by disregard of warning or attention. In this paper, we developed the detector for open of current transformer secondary terminal, and which was tested by the Korea Electrotechnology Research Institute. Test results show that Current Transformer secondary Open Detector(CTOD) interrupted within one second electronically when the 2nd terminal of current transformer opened.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2012년도 춘계학술대회
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• pp.833-836
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• 2012

최대수요전력 관리 장치는 현재 사용전력을 모니터링하여 예측 전력을 계산해 수용가에서 설정한 목표전력을 초과하지 않게 부하를 제어하는 장치이다. 부하의 제어는 예측된 최대수요전력이 목표전력을 초과할 경우 경보를 발생하고 부하를 차단하는 방식을 사용하기 때문에 최대수요전력에 대한 정확한 예측이 중요하다. 전력 변동이 심한 수용가에서는 기존의 예측 방법을 사용할 경우 최대수요전력 관리가 안정적이지 못하다는 단점이 있다. 본 논문에서는 기존의 최대수요전력 예측 방법 및 지수평활방법을 살펴보고 칼만 필터를 사용한 예측 방법을 제안한다.

• 센서학회지
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• 제26권6호
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• pp.420-426
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• 2017

A colorimetric sensor was investigated to achieve a low-cost warning device for harmful gaseous formaldehyde (HCHO). The sensor is based on selective reactions between hydroxylamine sulfate and HCHO, leading to the production of sulfuric acid. The produced acid results in color-changing response through the acid-base reaction with dye molecules impregnated on a solid membrane substrate. For attaining this purpose, sensors were fabricated by drop-casting a dye solution prepared using different pH indicators on various commercially available polymer sheets, and their colorimetric responses were evaluated in terms of sensitivity and reliability. The colorimetric sensor using bromophenol blue (BPB) and nylon sheet was found to exhibit the best performance in HCHO detection. An initial bluish green of a sensor was changed to yellow when exposed to gaseous formaldehyde. The color change was recorded using an office scanner and further analyzed in term of RGB distance for quantifying sensor's response at different HCHO(g) concentrations. It exhibited a recognizable colorimetric response even at 50 ppb, being lower than WHO's standard of 80 ppb. In addition, the sensor was found to have quite good selectivity in HCHO detection under the presence of common volatile organic compounds such as ethanol, toluene, and hexane.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(1)
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• pp.53-56
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• 2001

This paper has been developed a millimeter-wave radar to prevent car collision. This system needs to progress the problem as follows; (1) Increase of traffic accidents causing damage and injuries due to the increased number of motor vehicles and long distance driving, (2) Need for a device to help drivers who are in trouble due to bad weather conditions. (3) Need for a millimeter-wave radar as obstacles which need to be detected are small. This system is composited with some major technologies, Narrow beams to recognize obstacles or other objects, One-side circuit technology to prevent interference between electric waves, and Parts designed for radar products which are able to transmit millimeter - waves. The system has a various a application Field, Car distance auto-control system, prevent bump collision due to unexpected stoppage of the front car or careless driving, obstacle warning system, Car following system, and industrial and military purposes system. We have a looking forward to propose to develop field tests under various road conditions and hybrid car sensor by combining with other sensors

• 한국주거학회논문집
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• 제19권3호
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• pp.21-29
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• 2008

To investigate the actual conditions on the living environment of group-homes for the elderly and their living environment, 4 group-homes were surveyed. As the results, conditions of location for the group-home of the elderly looked positive, on the other hand, safety for criminal prevention, accessability and convenient facilities were not on level satisfied. The average area of each space in the group-home indicated that the bed room was $11.21\;m^2$, the living room $28.13\;m^2$, the kitchen $23.59\;m^2$, and the bath room had an integrated type of bath room and toilet $7.63\;m^2$. The physical environments of each space in the group-home were investigated, In bed room, door, windows and illumination were relatively good but safety was extremely inferior. Living room mostly looked good except the doorsill which needs refurbishment. In kitchen, cooking table, windows, illumination, ventilator were somewhat satisfactory but gas-warning device should have been installed. In addition, in bath room and toilet, location, door, window, illumination and finished material were satisfactory. But the stepped difference between the bath room and other space, safety-bar, emergency bell and floor heating system were seriously deteriorated and must be improved for the safety of the elderly. Conclusively, living environment of group-home for the elderly is mainly satisfactory but it was necessary to take a consideration for their safety.

• Journal of Mechanical Science and Technology
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• 제15권1호
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• pp.10-20
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• 2001

The leak before break(LBB) concept is difficult to apply to a structure with a thin tube that is immersed in a water environment. A heat exchanger in a nuclear power plant is such a structure. The present paper addresses an application of the LBB concept to a heat exchanger in a nuclear power plant. The minimum leaked coolant amount(approximately 37.9 liters) containing the radioactive material which can activate the radiation detector device installed in near the heat exchanger is assumed. A postulated initial flaw size that can not grow to a critical flaw size within the time period to activate the radiation detector is justified. In this case, the radiation detector can activate the warning signal caused by coolant leakage from initially postulated flaws of the heat exchanger. The nuclear plant can safely shutdown when this occurs. Since the postulated initial flaw size can not grow to the critical flaw size, the structural integrity of the heat exchanger is not impeded. Particularly the informational scenario presented in this paper discusses an actual nuclear plant.

• Earthquakes and Structures
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• 제22권1호
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• pp.53-64
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• 2022

This study proposes an intelligent semi-active isolation system combining a variable-stiffness control device and ground motion characteristic prediction. To determine the optimal control parameter in real-time, a genetic algorithm (GA)-fuzzy control law was developed in this study. Data on various types of ground motions were collected, and the ground motion characteristics were quantified to derive a near-fault (NF) characteristic ratio by employing an on-site earthquake early warning system. On the basis of the peak ground acceleration (PGA) and the derived NF ratio, a fuzzy inference system (FIS) was developed. The control parameters were optimized using a GA. To support continuity under near-fault and far-field ground motions, the optimal control parameter was linked with the predicted PGA and NF ratio through the FIS. The GA-fuzzy law was then compared with other control laws to verify its effectiveness. The results revealed that the GA-fuzzy control law could reliably predict different ground motion characteristics for real-time control because of the high sensitivity of its control parameter to the ground motion characteristics. Even under near-fault and far-field ground motions, the GA-fuzzy control law outperformed the FPEEA control law in terms of controlling the isolation layer displacement and the superstructure acceleration.

• 한국인공지능학회지
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• 제11권4호
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• pp.1-8
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• 2023

In this paper, we propose a black ice detection platform framework using Convolutional Neural Networks (CNNs). To overcome black ice problem, we introduce a real-time based early warning platform using CNN-based architecture, and furthermore, in order to enhance the accuracy of black ice detection, we apply a multi-scale dilation convolution feature fusion (MsDC-FF) technique. Then, we establish a specialized experimental platform by using a comprehensive dataset of thermal road black ice images for a training and evaluation purpose. Experimental results of a real-time black ice detection platform show the better performance of our proposed network model compared to conventional image segmentation models. Our proposed platform have achieved real-time segmentation of road black ice areas by deploying a road black ice area segmentation network on the edge device Jetson Nano devices. This approach in parallel using multi-scale dilated convolutions with different dilation rates had faster segmentation speeds due to its smaller model parameters. The proposed MsCD-FF Net(2) model had the fastest segmentation speed at 5.53 frame per second (FPS). Thereby encouraging safe driving for motorists and providing decision support for road surface management in the road traffic monitoring department.

• 시큐리티연구
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• 제14호
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• pp.195-214
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• 2007

이 연구의 목적은 대테러 대응책에서 보안, 경호, 경비시스템을 정부주도형에서 민영화로 전환할 수 있는 구축방안을 제시하고자 하는데 있다. 본 논문에서는 우리나라의 대테러 현황과 선진국과의 비교를 통한 민간시큐리티의 발전방안 중 대테러 전문가 양성을 위한 자격제도 및 제반적인 발전 방안에 대해서 연구하고자 하는데 목적이 있다. 본 논문의 요약은 다음과 같다. 첫째, 국가적 대응전략에서는 선진국과 같은 통합적인 대테러 센터를 설립해야 한다. 둘째, 미국의 대통령 직속기구로 통합된 국토안보부와 같은 (가칭 : 대테러 안전부) 기구를 만들어야 한다. 셋째, 대테러법에 대한 제정이다. 넷째, 국민과 상호신뢰 회복할 수 있는 대테러 업무 민영화에 따른 협력 체제를 만들어야 한다. 다섯째, 테러 경보 체제가 필요하다. 그에 따른 민간시큐리티의 상호연계성과 발전방안으로서는 첫째, 대테러 전문가를 양성해야 한다. 둘째, 대테러 전문가 자격증 제도를 도입시켜야 한다. 셋째, 민영화 된 대테러 연구소가 필요하다. 넷째, 대테러 방지법제정을 위한 민영화의 역할의 중요성이다. 이상에서 살펴본 바와 같이 우리나라의 대테러 전문가 양성을 위한 민간시큐리티의 역할증대 방안에서 본 연구자는 무엇보다도 국가주도형에서 민간시큐리티 관련 분야와 상호 협력하는 체제 또한 학계와 관련하여 상호 보완하는 산 학 관의 협력 체제를 구축해 나가는 것이 절실히 필요하고 위에서 제시한 바와 같이 총론적 접근보다는 대테러의 체계적 연구가 시급히 요구되는 것이 현실이다. 다양한 대테러 전문가를 양성하고 시큐리티 관련 종사자들의 의식전환과 대테러 교육 기자재 및 교육내용을 구축해서 특정단체 권한이 아니고 인권침해 최소화 할 수 있는 다각적 검토 연구가 후속연구를 계속해서 연구되어져야 할 것이라 사료된다.

• 시큐리티연구
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• 제17호
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• pp.157-172
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• 2008

21세기의 세계화, 정보화 시대에서 국가의 안보목표를 달성하기 위한 하나의 수단이 국가 정보라고 할 수 있겠다. 국가안보의 목표를 충실히 달성하기 위해서는 안보환경에 변화에 따라 신축성 있게 부응하는 것이 국민들로부터 신뢰와 지지를 받는 길이므로 매우 중요하다. 그에 따른 국가정보체계는 세계의 안보적 차원에서 군사적, 비군사적 등 수집목표활동이 확대되고 다양한 분야로 정보 첩보들이 복잡하게 연계되어 있기 때문에 체계적으로 파악하기 위해서는 종합적 정보 체계의 확립이 요구된다. 인터넷의 발달로 정부기관은 보다 전문성과 사회성이 있는 정보생산을 위해 노력해야 할 것이다(세종연구소, 2007). 이와 같이 국가위기관리 측면에서 테러의 분야는 여러 사태 중에서도 가장 중요한 분야라고 사료 된다. 지난 17대 때에 테러 방지법이 통과되지 못했지만, 이번 18대에는 법적 반대하는 부분을 원활하게 상호 협조하여 대 테러법이 우선적으로 제정 되야 하는 것이 가장 중요하다고 본 연구자는 생각한다. 인권단체나 수사권에 관련된 기관들 간의 상호 협조, 권한에 대한 양보와 이해가 절실히 필요할 것이다. 본 연구자는 국가정보원 주관으로 국가정보의 국민의 홍보, 교육 참여, 신고, 포상, 피해 보상, UCC제작, 획일 된 대테러 교보제 제작, 대테러 전문가 양성, 대테러 학회 및 협회 창설, 대테러 연구소 설립 등 대테러 정보센타의 소극적 움직임을 탈피하여 적극적인 움직임으로의 전환을 통하여 국민의 대응조치 예방 사전지식을 계몽, 국가정보기관의 이미지 개선이 꼭 필요한 시점이라 사료된다. 즉, 과거 국가정보기관의 인식 탈바꿈과 국익도 필요하겠지만, 국민 개개인의 안전보장을 영위하며 함께 발전할 수 있는 계기가 필요할 것이다.