• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2005년도 Proceedings of The 6th korea-china joint workshop on nuclear waste management
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• pp.258-268
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• 2005

A new approach has been adopted to remove the hot particulates from nuclear facilities, KAERI, South Korea, by using the new compact cyclone train, made of steel ness steel, with optional vortex finder length. Flow rate results showed a dramatic change in removal efficiency, performance was changed with the change of exit tube length. The 15 m/s flow rate was found suitable one for new equipment with the 49 mm optimum exit tube length for 76 mm cyclone body diameter. Results shows the removal efficiency for $1\;{\mu}m$ was more than $65\%$ and for $10\;{\mu}m$ was seen ${\~}97\%$. Over 15 m/s flow rate, was not shown much different in removal efficiency. The removal efficiency increased with the flow rate, and pressure drop. Cut size diameter decrease with the inlet flow rate. Cut size diameter found lowest with 49 mm exit tube length and 15 m/s flow rate. For filters the performance decreased with the inlet velocity increased.

• 한국진공학회지
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• 제16권4호
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• pp.235-243
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• 2007

지금 국내에서는 토카막 핵융합실험장치, 대전류 중성입자빔 실험장치 및 우주 모의실험실 같은 거대시설의 건설과 운용이 활발하다. 이런 시설의 핵심설비인 대형 진공용기는 중소형 용기에 비해 누설 가능성은 높은 반면 기체누설을 검사하는 것은 까다롭다. 중소형 용기에서 널리 사용되는 헬륨누설검사 방법을 어떻게 효율적으로 이런 대형 용기에 적용할 수 있는가 알아보기 위해, 다양한 가상적인 누설검사 시스템들을 구성하고 압력분포 및 헬륨 분압을 계산하여 주어진 장치조건에서 적절한 검사 시스템을 찾는 방법에 대해 논한다.

• Smart Structures and Systems
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• 제5권4호
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• pp.483-494
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• 2009

Damage detection has been proven to be a challenging task in structural health monitoring (SHM) due to the fact that damage cannot be measured. The difficulty associated with damage detection is related to electing a feature that is sensitive to damage occurrence and evolution. This difficulty increases as the damage size decreases limiting the ability to detect damage occurrence at the micron and submicron length scale. Damage detection at this length scale is of interest for sensitive structures such as aircrafts and nuclear facilities. In this paper a new photonic sensor based on photonic crystal (PhC) technology that can be synthesized at the nanoscale is introduced. PhCs are synthetic materials that are capable of controlling light propagation by creating a photonic bandgap where light is forbidden to propagate. The interesting feature of PhC is that its photonic signature is strongly tied to its microstructure periodicity. This study demonstrates that when a PhC sensor adhered to polymer substrate experiences micron or submicron damage, it will experience changes in its microstructural periodicity thereby creating a photonic signature that can be related to damage severity. This concept is validated here using a three-dimensional integrated numerical simulation.

• Perspectives in Nursing Science
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• 제6권1호
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• pp.55-65
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• 2009

The Korean government introduced Home Care Services System to cut medical cost and make efficient use of limited medical resources because of increasing chronic diseases and the growing population of the elderly. The Korean government established measures to control the use of insurance services by restricting the number of nurse's visits to patient's home and by asking the patients to shoulder the transportation fee of nurses during the visit. Factors such as oversupply of hospital facilities, low price of home care services, high insurance coverage for hospital services and increased nuclear family set up resulted in the limited use of home care nursing services. The introduction of long-term care insurance in 2007 brought the decrease in the number of home care agencies and these agencies are facing a crisis today. The increase in chronic diseases and growing population of the elderly recently resulted in the need to control the high medical cost. Home care services for early discharge patients and chronic-severe disease patients will contribute in the reduction of medical cost at the same time improves the quality of patient's life. To catch up with the demands of the nation, accessibility to home care services should be improved and policies such as the expansion of home care services insurance coverage and promotion of establishing home care agencies should be considered.

• 한국CDE학회논문집
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• 제18권3호
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• pp.200-210
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• 2013

It has become important to manage plant data effectively and to share these data among different organizations that are located in different places and participate in a variety of lifecycle phases. ISO 15926 is an international standard for integration of lifecycle data for process plants including oil and gas facilities. This standard consists of several parts providing a generic data model, reference data, and implementation methods. iRINGTools is a tool developed for the exchange of plant design data. This tool supports the implementation methods specified in ISO 15926. In this paper, the exchange of plant design data using iRINGTools is investigated. For this, sample P&ID data was modeled and data exchange experiment was performed. From the experiment, a data exchange procedure based on ISO 15926 is established and design data types that can be practically exchanged using ISO 15926 were identified.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.468-470
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• 2015

EMP(ElectroMagnetic Pulse)는 미국이 태평양에서 실시한 수소폭탄 실험에서 처음으로 그 존재가 발견되었다. 핵무기는 열과 폭발력으로 인명을 살상하는 무기이지만, 우연히 발견된 EMP는 인명의 손상 없이 전자장비에 치명적인 손상을 가할 수 있는 무기체계로 활용될 수 있으며, 특히 컴퓨터 등 전자장치에 의해 작동되는 자동화 무기체계를 효과적으로 무력화 할 수 있다. 따라서 주요 군사시설은 EMP로부터 보호되는 설비가 필수적으로 구비되고 있다. 본 논문에서는 EMP의 개념에 대해 설명하고, EMP로부터 보호하기 위한 대응 방안에 대해 조사하여 기술하였다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제18권2호
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• pp.65-76
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• 2012

South Korea's rapid ageing and the fast increase of nuclear families have led to the social isolation of the elderly and generational conflicts. In order to solve these social problems, this study explores the ways in which different generations can communicate and interact more actively. We surveyed 110 social workers who run generation-integrated programs at community centers in Gyeonggi province, and also examined the spatial design of the four age-integrated community centers and analysed its effect on the intergenerational exchange. We propose several suggestions for intergenerational exchange programs and effective space planning to facilitate intergenerational interactions in multi-generational community centers. To develop intergenerational interactions and keep their constant relationship, the users of community centers should be the core of generation-integrated programs which can facilitate the intergenerational exchange and interactions.

• 대한인간공학회지
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• 제30권1호
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• pp.117-125
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• 2011

While human error happens repeatedly in the semiconductor industry in Korea, which has brought a tremendous loss from manpower, welfare etc., there are limitations to human error prevention activities. When a semiconductor company introduces new machines and facilities from Japan or Germany, the companies often do not consider human factors in the design. Also, semiconductor companies are so occupied with promoting increased productivity, their attention to human errors has been pushed aside. Negative aspects of technical exchange associated with safety management are one aspect of the industry's nature. A semiconductor company recently began acknowledging on the back of TQM(Total Quality Management) that human error has a decisive effect on the safety. There are a number of uncontrollable and hard to handle event sets because the nature of these events with a human error may often be threatened or very intensive. It is strongly required that systemic studies should be performed to grasp the whole picture of a current situation for hazard factors. This study aims to examine the human error approach through the case of human error prevention field activities in a semiconductor industry compared with the activities and experience in nuclear power plants.

• 한국안전학회지
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• 제29권4호
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• pp.184-190
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• 2014

Decommissioning process of nuclear facilities consist of a sequence of problem solving activities, because there may exist not only working environments contaminated by radiological exposure but also industrial hazards such as fire, explosions, toxic materials, and electrical and physical hazards. Therefore, not a few countries in the world have been trying to develop appropriate counter techniques in order to guarantee safety and efficiency of the process. In spite of that, there still exists neither domestic nor international standard. Unfortunately, however, there are few workers who experienced decommissioning operations a lot in the past. As a solution, it is quite necessary to utilize experts' opinions for risk assessment in decommissioning process. As for an individual hazard factor, risk assessment techniques are getting known to industrial workers with advance of safety technology, but the way how to integrate those results is not yet. This paper aimed to find out an appropriate technique to integrate individual risk assessment results from the viewpoint of experts. Thus, on one hand the whole risk assessment activity for decommissioning operations was modeled as a sequence of individual risk assessment steps which can be classified into two activities, decontamination and dismantling, and on the other, a risk assessment structure was introduced. The whole model was inferred with Fuzzy theory and techniques, and a numerical example was appended for comprehension.

• 동력기계공학회지
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• 제6권1호
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• pp.68-73
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• 2002

An opportunity to use the elevated temperature has been recently increasing in various elements of heat facilities or machines such as heat exchanger tubes, pressure vessels, engines of aircraft, boilers and turbines in power plants, and nuclear reactor components, etc. as machinery industry develops. Thus, the development of such elevated-temperature heat-resisting materials and the studies on their elevated-temperature materials friction welding, creep design and analysis have been considered as an important and needful fact. In this paper, friction welding optimization for 1Cr0.5Mo to STS304 and AE applications for the weld quality evaluation were investigated. The important results of this study are as follows : The techniques for dissimilar friction welding optimization of the elevated temperature materials 1Cr0.5Mo and STS304 and its real-time weld quality evaluation by AE were developed, considering on both strength and toughness. Quantitative relationship was identified among welding condition, weld quality and cumulative AE counts.