• 한국산업보건학회지
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• 제29권4호
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• pp.590-602
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• 2019

Objectives: This study was conducted to prevent asphyxiation of firefighters during confined space rescue. The specific purpose was to identify the magnitude of the problem, identify the cause of the accidents, and suggest measures to ensure safety of confined space rescues. Methods: We collected data from National Fallen Firefighters Memorial, press releases, and other sources In order to identify the current situation of asphyxiation incidents among firefighters from 1945 to 2019. In addition, an incident investigation was conducted for each case, and the processes, causes, and control measures of the incidents were described as a narrative data entry. Results: Over the past 73 years, eight incidents involving firefighter in Korea have occurred. In these incidents, five firefighters were killed, and eight were injured. The confined spaces incidents occurred were water supply tanks, wastewater treatment tanks, pickling pits, septic tanks, and more. The causes were three cases of hydrogen sulfide poisoning, one of oxygen deficiency, one of carbon monoxide poisoning, and three unclassifiable asphyxiations. The people in need were all workers in various industries. Conclusions: The number of firefighters' deaths and injuries during rescues in confined spaces was severe and the risks have not been completely eliminated. By establishing and implementing a precise incident investigation system, according control measures should be initiatedin order to prevent a recurrence of the same type of disaster and reflected in the SOP. In particular, due to the high risk of occurrence at workplaces, cooperation between fire and rescue authority and relevant agencies such as the Ministry of Employment and Labor and the KOSHA should be strengthened.

• 한국가스학회지
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• 제19권4호
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• pp.62-67
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• 2015

본 논문에서는 LPG 소형저장탱크의 보급확대에 따른 위험성감소 방안으로 소형저장탱크의 지상 및 지하매몰 설치에 대한 피해영향평가를 수행하였다. 지하에 설치된 소형저장탱크의 피해영향평가를 수행하기 위해 FDS를 활용하여 격납형으로 설치된 소형저장탱크를 모사하였고, FDS로부터 소형저장탱크실의 최대 압력을 도출하여 피해영향 평가 프로그램인 Phast의 입력변수로 활용하였다. 지상 및 지하에 설치된 소형저장탱크의 각각의 피해영향평가를 시뮬레이션을 통해 연소하한계(LFL) 및 연소상한계(UFL)의 확산범위, 고압분출화재(Jet fire), 폭발 등 피해영향을 정량적인 수치로 제시하였다.

• Design & Manufacturing
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• 제16권4호
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• pp.52-59
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• 2022

Currently, Korea is an aging society and is expected to become a super-aged society in about four years. X-ray devices are widely used for early diagnosis in hospitals, and many X-ray technologies are being developed. The development of X-ray device technology is important, but it is also important to increase the reliability of the device through accurate data management. Sensor nodes such as temperature, voltage, and current of the diagnosis device may malfunction or transmit inaccurate data due to various causes such as failure or power outage. Therefore, in this study, the temperature, tube voltage, and tube current data related to each sensor and detection circuit of the diagnostic X-ray imaging device were measured and analyzed. Based on QC data, device failure prediction and diagnosis algorithms were designed and performed. The fault diagnosis algorithm can configure a simulator capable of setting user parameter values, displaying sensor output graphs, and displaying signs of sensor abnormalities, and can check the detection results when each sensor is operating normally and when the sensor is abnormal. It is judged that efficient device management and diagnosis is possible because it monitors abnormal data values (temperature, voltage, current) in real time and automatically diagnoses failures by feeding back the abnormal values detected at each stage. Although this algorithm cannot predict all failures related to temperature, voltage, and current of diagnostic X-ray imaging devices, it can detect temperature rise, bouncing values, device physical limits, input/output values, and radiation-related anomalies. exposure. If a value exceeding the maximum variation value of each data occurs, it is judged that it will be possible to check and respond in preparation for device failure. If a device's sensor fails, unexpected accidents may occur, increasing costs and risks, and regular maintenance cannot cope with all errors or failures. Therefore, since real-time maintenance through continuous data monitoring is possible, reliability improvement, maintenance cost reduction, and efficient management of equipment are expected to be possible.

• 한국산업융합학회 논문집
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• 제23권3호
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• pp.419-425
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• 2020

There are many accident risks in logging operation of forestry such as struck by felled trees and caught in, under, or between felled trees. These accidents are primarily occurred by not keeping a safe distance between workers. According to the forestry safety instruction, workers are not supposed to go into the safety zone which is a circle with a radius of more 2 times the height of felling tree. However, this rule does not keep because of poor safety consciousness, poor sight and extreme noise of logging operation machines. This problem causes many major accidents every year. To solve this problem, we made forestry safety helmets based on IoT technology. These helmets have functions to make a visual and an acoustic alarm signal when reach the distance between workers within 20 meters. We developed the algorithm to operate the helmet's functions and conducted tests to check the functions. As a result of tests, we assured the normal system operating conditions.

• International Journal of Concrete Structures and Materials
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• 제10권1호
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• pp.75-85
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• 2016

Fire ranks high among the potential risks faced by most buildings and structures. A full understanding of temperature effects on fiber reinforced concrete is still lacking. This investigation focuses on the study of the residual compressive strength, stress strain behavior and surface cracking of structural polypropylene fiber-reinforced concrete subjected to temperatures up to $300^{\circ}C$. A total of 48 cubes was cast with different fiber dosages and tested under compression after exposing to different temperatures. Concrete cubes with varying macro (structural) fiber dosages were exposed to different temperatures and tested to observe the stress-strain behavior. Digital image correlation, an advanced non-contacting method was used for measuring the strain. Trends in the relative residual strengths with respect to different fiber dosages indicate an improvement up to 15 % in the ultimate compressive strengths at all exposure temperatures. The stress-strain curves show an improvement in post peak behavior with increasing fiber dosage at all exposure temperatures considered in this study.

• 한국가스학회지
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• 제13권3호
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• pp.7-14
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• 2009

위험물들은 위험물의 사용, 저장 및 관리뿐만 아니라 수송시에도 많은 위험성을 내포하고 있어 많은 나라에서는 적당한 기준을 마련하여 특별히 관리하고 있다. 우리나라 철도 위험물 안전수송에 관한 철도안전법 개정을 위하여 국내 철도 위험물의 수송량과 종류를 분석하고 국내외 위험물분류기준을 비교하였다. 우리나라는 지리적으로 대륙을 연결하기 편리한 위치에 있어 향후 국경을 넘어 대륙을 횡단하는 국제법을 채택하는 것이 매우 유리하고, 수송되어야 할 물질의 종류가 다양해질 것을 대비하여 국제적으로 통용될 수 있는 위험물분류와 위험물판정방법을 채택하는 것을 제안하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 D
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• pp.2289-2291
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• 2002

In maned airport, crews may have risks as they manage passenger control system in IPMS in damage situations such as fire in a airport. So the application of unmanned autonomous system can reduce the number of boarding crews and attribute to safe airplane transportation. PBBC model can be used to obtain control strategy, and airplane and enhance operators' skill by simulating the airport. The paper suggests an intelligent system of the pbbc control using microprocessor in integrated platform management system which can take measures against passenger situation of a airplane excluding unnecessary warnings with undamaged situations. The system here detected the passenger more accurately and adopted more appriate measures according to airplane status compared with conventional systems.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2002년도 춘계학술발표논문집 (하)
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• pp.1203-1206
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• 2002

통합플랫폼 관리체재의 운용에 있어서 승객제어장치를 제어하고 감시하는 공항관리자에게는 공항관련 등의 상황통제시 항상 위험이 존재하고 있다. 비행기에 무인화를 도입하면 인간이 수동적으로 처리해야 하는 부분을 기계로 대체하면 보다 안전하게 되어 여러 위험도를 감소시킬 수 있는 해결책의 하나가 될 수가 있을 것으로 본다. 제안된 방법의 성능을 평가하기 위해, 탑승시스템을 조작하는 제어시스템의 컴퓨터 시뮬레이터를 만들어 수행해 보았다. 본 논문에서는 통합플랫폼 관리체재 하에서 열악한 손상조건에서도 탑승객의 불편을 주지 않고 비행기의 여러 가지 돌발상황에 따른 적절한 조치를 자동적으로 취해주는 마이크로프로세서를 이용한 탑승시스템을 설계하고 구현했다. 제안하는 시스템은 기존 시스템과 비교시 보다 정밀하게 탑승영역활동을 하였고 돌발시에도 비행기가 처한 상황에 따라 보다 적절한 조치를 취할 수가 있었다.

• 한국가스학회지
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• 제24권6호
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• pp.83-90
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• 2020

본 연구는 국제공동 연구로 만들어진 HyKoRAM 프로그램을 이용하여 위험성평가를 진행하였다. 수소충전소 내 압축기, 저장탱크, 수소 배관 등 주요 시설 및 구성품의 설계 사양, 실증 단지 주변의 환경 조건 등을 반영한 대안의 사고 시나리오와 시설에서 발생할 수 있는 최악의 시나리오에 기반하여 위험성 평가를 실시하였다. 수소충전소의 잠재 위험을 확인하여 수소 저장 탱크, 처리 시설, 저장 시설 등에서 발생 가능한 최악의 누출, 화재, 폭발, 사고 시나리오를 도출하고, 사고 발생 가능성과 인체, 주변 시설 피해 영향 분석을 하여 안전성을 검토하고자 한다.

• 방사성폐기물학회지
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• 제20권3호
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• pp.365-369
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• 2022

Operating and decommissioning nuclear power plants generates radioactive waste. This radioactive waste can be categorized into several different levels, for example, low, intermediate, and high, according to the regulations. Currently, low and intermediate-level waste are stored in conventional 200-liter drums to be disposed. However, in Korea, the disposal of intermediate-level radioactive waste is virtually impossible as there are no available facilities. Furthermore, large-sized intermediate-level radioactive waste, such as reactor internals from decommissioning, need to be segmented into smaller sizes so they can be adequately stored in the conventional drums. This segmentation process requires additional costs and also produces secondary waste. Therefore, this paper suggests repurposing the no-longer-used spent nuclear fuel casks. The casks are larger in size than the conventional drums, thus requiring less segmentation of waste. Furthermore, the safety requirements of the spent nuclear fuel casks are severer than those of the drums. Hence, repurposed spent nuclear fuel casks could better address potential risks such as dropping, submerging, or a fire. In addition, the spent nuclear fuel casks need to be disposed in compliance with the regulations for low level radioactive waste. This cost may be avoided by repurposing the casks.