• Journal of Radiation Protection and Research
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• 제41권4호
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• pp.409-417
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• 2016

Background: Airborne radioactive particulate in many important nuclear facilities (particularly nuclear power plants) will have a strong impact on the relative public dose if they are released into the corresponding environment traversing the stack or vents. The radiation protection researchers have regarded the relative environment assessing and estimation of public doses. And the model of assessing impact of discharges radioactive substance to the environment have been recommended by many international organizations (e.g. IAEA) with the nuclear energy safety and radiation protection. Materials and Methods: This paper introduced the generic models that were suggested by International Atomic Energy Agency (IAEA), for use in assessing the impact of discharges of radioactive substances to the environment (e.g. IAEA Safety Report Series No.19). Results and Discussion: The writers of this paper, based on the recommend methods, assessed the discharge limits in some airborne radioactive substances discharging standards. The reasons that IAEA method are introduced are mainly the following considerations: IAEA is one of international organizations with some authorities in the nuclear energy safety and radiation protection; and, more important, the recommend modes are operational methods rather than the methods having little operations such as that have used by some researchers. Conclusion: It is wish that the introduced methods in this paper can be referenced in draft or revise of the standards related to discharges of radioactive substances to the environment.

• 한국해양공학회지
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• 제29권2호
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• pp.120-127
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• 2015

When a deep-seabed lifting pump is kept this device has bending and deformation in the axis due to its long length(8m). These influences can be caused a breakdown. Therefore, a mounting must be developed to keep the lifting pump safe. This paper discusses the hydraulic cylinder design of the lifting pump and structural safety estimation of the mounting using SBD(simulation-based design). The multi-body dynamic simulation method is used, which has been used in the automotive, structural, ship building, and robotics industries. In this study, the position and diameter of the hydraulic cylinder were determined based on the results of the strokes and buckling loads for the design positions of the hydraulic cylinder. A structural dynamic model of the mounting system was constructed using the determined design values, and the structural safety was evaluated using this dynamic model. According to these results, this system has a sufficient safety factor to manufacture.

• 한국터널지하공간학회 논문집
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• 제13권2호
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• pp.115-131
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• 2011

최근 들어 방재 및 환경훼손 측면을 고려하여 병설터널의 시공 사례가 증가하고 있다. 병설터널의 굴착 시 필라(Pillar)부에 응력이 집중되어 터널의 안정성이 저하된다. 필라부의 거동에 대한 기존 연구들은 주로 수치해석과 실내 모형 실험을 통한 병설터널의 거동평가 및 지표침하 경향 분석 등에 국한되어 있어서, 필라부의 정량적 안정성 평가에는 한계가 있다. 따라서 본 연구에서는 병설터널의 필라폭이 터널의 안정성에 미치는 영향을 정량적으로 살펴보았다. 이를 위해 토피고가 다른 두 단면에 대해 전단강도 감소법을 이용한 수치해석적 방법으로 구한 터널 전체 안전율, Matsuda 등이 제안한 식을 이용하여 구한 필라부 국부안전율, 및 필라부의 강도/응력비를 산정하고 결과를 분석하였다. 합리적인 병설터널의 필라부 설계를 위해, 평균 강도/응력비, Matsuda 제안식에 의한 안전율, 수치해석적으로 구한 전체 안전율이 독립적으로 사용되기보다는 유기적으로 사용되어야 할 것으로 판단되었다.

• Nuclear Engineering and Technology
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• 제42권4호
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• pp.450-459
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• 2010

The present paper investigates the collapse pressure of cylinders with intermediate thickness subjected to external pressure based on detailed elastic-plastic finite element (FE) analyses. The effect of the initial ovality of the tube on the collapse pressure was explicitly considered in the FE analyses. Based on the present FE results, the analytical yield locus, considering the interaction between the plastic collapse and local instability due to initial ovality, was also proposed. The collapse pressure values based on the proposed yield locus agree well with the present FE results; thus, the validity of the proposed yield locus for the thickness range of interest was verified. Moreover, the partial safety factor concept based on the structural reliability theory was also applied to the proposed collapse pressure estimation model, and, thus, the priority of importance of respective parameter constituting for the collapse of cylinders under external pressure was estimated in this study. From the application of the partial safety factor concept, the yield strength was concluded to be the most sensitive, and the initial ovality of tube was not so effective in the proposed collapse pressure estimation model. The present deterministic and probabilistic results are expected to be utilized in the design and maintenance of cylinders subjected to external pressure with initial ovality, such as the once-through type steam generator.

• 국제학술발표논문집
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• The 4th International Conference on Construction Engineering and Project Management Organized by the University of New South Wales
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• pp.168-175
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• 2011

Construction accidents are major problem in Turkish Construction industry and especially fatally rates are very high. Current legislative system on occupational safety in Turkey enforces employers to implement safety measures as well as safety management systems. However level of consciousness in the industry is unsatisfactory and safety are perceived as extra cost and unnecessary expenditure. Moreover, especially in small residential building constructions which have a big share in the industry and unfortunately safety measures to mitigate or abate construction risks do not exist. The study focuses on small residential building construction sites and in the scope of this study, thirty building projects are examined. For each building project, project cost including labour and material costs, service and consultancy costs for mechanical, electrical systems as well as architectural and structural services, costs for supervision and finally general expenditures for construction site facilities were calculated. On the other hand, occupational safety costs for personal protective equipment, collective protective measures, consultancy and training were determined. Work breakdown structures were established and for each work item firstly occupational risks were evaluated and furthermore according to risk scores safety measures to be implemented were defined and related costs were calculated. The study gave results for total safety cost on average, in terms of percentage of total project cost (3.73% of total project cost), safety cost per man-hour (0.40 USD) and safety cost in terms of unit construction area (11.60 USD per square meter). Since safety management is a part of whole project management process, study gives suggestions and techniques to calculate safety costs and implement safety measures as a part of project management service for professionals. Authors believe that suggested approach may easily developed by the usage of more data to establish a model for estimation not only for building construction sites but also for all construction projects.

• 한국화재소방학회논문지
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• 제24권2호
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• pp.120-125
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• 2010

본 연구에서는 최대 지친상태가 신체의 평형성, 민첩성, 순발력에 미치는 영향을 조사하여 소방공무원의 안전을 위한 기초자료 제공을 목적으로 하며 연구에서 얻어진 결과를 제시하면 다음과 같다. 순발력 평가를 위한 제자리 높이뛰기는 운동부하 검사 전에는 $41.0{\pm}3.2cm$, 검사 후 즉 최대 지친상태에서는 $42.2{\pm}6.02cm$로 측정되었다. 평형성 검사에서 정적평형성 평가를 위한 눈감고 한발로 서기는 운동부하 검사 전 에는 $40.3{\pm}36.8$sec 검사 후는 $27.5{\pm}27.18$sec로 측정되어 약 32% 감소하는 경향이 나타났다. 동적평형성 검사를 위한 평균대 걷기에서는 운동부하 검사 전에는 $6.2{\pm}1.22$sec 검사 후에는 $6.4{\pm}1.57$sec로 나타났으며 통계적으로 유의하였다. 민첩성 평가를 위한 반복 옆뛰기 결과 운동부하 검사 전에는 $40.3{\pm}3.40$rep/20sec 검사 후에는 $43.3{\pm}2.50$rep/20sec로 통계적으로 유의하게 증가하였다. 또한 전신반응검사에서는 운동부하 검사 전에는 $0.21{\pm}0.05$sec, 검사 후에는 $0.18{\pm}0.02$sec로 약간 감소하였다.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2018년도 공동국제학술발표회
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• pp.127-127
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• 2018

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2018년도 공동국제학술발표회
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• pp.8-8
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• 2018

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2018년도 공동국제학술발표회
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• pp.126-126
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• 2018

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(2)
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• pp.1181-1181
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• 2005