• Nuclear Engineering and Technology
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• v.50 no.8
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• pp.1372-1386
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• 2018

Despite recent advances in multi-hazard analysis, the complexity and inherent nature of such problems make quantification of the landslide effect in a probabilistic safety assessment (PSA) of NPPs challenging. Therefore, in this paper, a practical approach was presented for performing an earthquake-induced landslide PSA for NPPs subject to seismic hazard. To demonstrate the effectiveness of the proposed approach, it was applied to Korean typical NPP in Korea as a numerical example. The assessment result revealed the quantitative probabilistic effects of peripheral slope failure and subsequent run-out effect on the risk of core damage frequency (CDF) of a NPP during the earthquake event. Parametric studies were conducted to demonstrate how parameters for slope, and physical relation between the slope and NPP, changed the CDF risk of the NPP. Finally, based on these results, the effective strategies were suggested to mitigate the CDF risk to the NPP resulting from the vulnerabilities inherent in adjacent slopes. The proposed approach can be expected to provide an effective framework for performing the earthquake-induced landslide PSA and decision support to increase NPP safety.

• The Journal of the Acoustical Society of Korea
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• v.40 no.1
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• pp.73-83
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• 2021

Wind power energy harvesting has a big potential as a future clean energy resource, but accompanies infrasonic noises. The infrasound is difficult to shield and can induce various negative physiological effects. In this study, the Wind Turbine Syndrome (WTS) caused by the infrasonic noises are introduced, and the technical aspects for the measurement and management of the infrasonic noises from wind power plants are discussed.

• Current Photovoltaic Research
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• v.10 no.4
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• pp.116-120
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• 2022

Solar energy is rapidly being utilized to generate power in Europe and other countries, but the environmental effect of building and operating solar farms is not fully understood. The building of a solar park demands the removal of certain vegetation and the leveling of the land. Solar energy infrastructure may involve considerable landscape change, altering soil biological processes and influencing hydrologic, carbon and vegetative dynamics. To rebuild the solar PV facilities soils, inherent plant fields might require to be re-established. Within the scope of this research, we presented an analysis of the effects that were caused by the solar farm.

• Nuclear Engineering and Technology
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• v.54 no.11
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• pp.4170-4180
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• 2022

The task complexity (TACOM) measure was previously developed to quantify the complexity of proceduralized tasks conducted by nuclear power plant operators. Following the development of the TACOM measure, its appropriateness has been validated by investigating the relationship between TACOM scores and three kinds of human performance data, namely response times, human error probabilities, and subjective workload scores. However, the information reflected in quantified TACOM scores is still insufficient to determine the levels of complexity of proceduralized tasks for human reliability analysis (HRA) applications. In this regard, the objective of this study is to suggest criteria for determining the levels of task complexity based on logistic regression between human error occurrences in digitalized main control rooms and TACOM scores. Analysis results confirmed that the likelihood of human error occurrence according to the TACOM score is secured. This result strongly implies that the TACOM measure can be used to identify the levels of task complexity, which could be applicable to various research domains including HRA.

• Annual Conference of KIPS
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• 2022.11a
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• pp.141-143
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• 2022

풍력 설비 공유 플랫폼은 풍력발전에 참여하고 있는 기업들간에 보유하고 있는 설비나 부품에 대한 정보를 공유하도록 지원해 주는 플랫폼이다. 이를 위해 내 설비관리, 고장이력 관리, 설비공개 현황, 내 계약 현황 기능을 구현하였다. 풍력 설비 공유 플랫폼을 통해 발전소 설비에 문제가 발생했을 시, 주변의 다른 발전소에서 보유하고 있는 예비 부품을 빠르게 공급받을 수 있도록 지원해 줄 뿐만 아니라, 고장이 빈번한 부품에 대한 구매정보, 고장이력정보 등을 사전에 구축 할 수 있도록 관리해줌으로써 추후 문제 발생 시 빠른 대응이 가능하다.

• International conference on construction engineering and project management
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• 2011.02a
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• pp.84-87
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• 2011

This paper describes the application of the three sustainable design elements for a residential project in the county of Los Angeles, USA. The first design element is the green building design in which a base model will be created using the Autodesk REVIT MEP program for the analysis by Building Information Modeling (BIM) for the energy analysis modeling process to determine the energy savings for each of the recommended design features. The second element is the Low Impact Development design for the site design using specialty material and structural devices for infiltration and recycling of storm water for reuse. The third element is the application of drought tolerant plant species in the site's landscaping design as a means to conserve water. The construction cost associated with the application of these three elements will be reviewed to determine the practicality and effectiveness of this sustainable design approach.

• Annual Conference of KIPS
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• 2024.10a
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• pp.533-536
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• 2024

운전지원은 원자력 분야에서 인공지능 기술의 현장 적용 가능성이 가장 높은 기능 중에 하나이다. 원전 시설을 감시, 비정상 탐지, 사고 예측, 조치 지원과 같은 다양한 세부 기능에서 인공지능기술을 적용하기 위한 연구가 수행되고 있다. 원전은 안전상의 이유로 규제기관의 신뢰성 검토를 통한 허가를 받은 기능만 현장에서 운용 가능하다. 그러나, 인공지능 기술은 전통적인 소프트웨어와는 다른 특성들 때문에 기존 방식으로는 신뢰성을 평가하기 어렵고 이것은 현장 적용을 더디게 하는 요소가 된다. 이 논문은 국내외 문헌조사를 통해 원전분야에서 인공지능 모델의 신뢰성을 평가하기 위한 항목들을 검증 요건으로 제안한다. 이러한 검증 요건에 대한 정성적, 정량적 평가는 원전 인공지능 모델의 신뢰성을 평가하는데 도움이 될 것으로 기대된다.

• Journal of Institute of Convergence Technology
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• v.13 no.1
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• pp.13-17
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• 2023

Direct air capture (DAC) refers to the process of permanently removing CO₂ from the atmosphere by capturing CO₂ that has been emitted into the atmosphere from the past to the present directly from the atmosphere. DAC is a process that captures CO₂ that exists at 400 ppm in the atmosphere, so it has the problem of requiring a significant amount of air and high energy compared to CO₂ capture from a point source such as exhaust gas from a coal-fired power plant. In this study, we aim to introduce the performance, characteristics, and processes of absorbents that can be applied to DAC, focusing on the DAC process using absorbents developed to date, and present challenges that must be overcome in future DAC technology development.

• Korean Chemical Engineering Research
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• v.50 no.2
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• pp.365-370
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• 2012

In this study, Economic analysis of supercritical coal-fired power plant with $CO_2$ capture process was performed. For this purpose, chemical absorption method using amine solvent, which is commercially available and most suitable for existing thermal power plant, was studied. For the evaluation of the economic analysis of coal-fired power plant with post-combustion $CO_2$ capture process in Korea, energy penalty after $CO_2$ capture was calculated using the power equivalent factor suggested by Bolland et al. And the overnight cost of power plant (or cost of plant construction) and the operation cost reported by the IEA (International Energy Agency) were used. Based on chemical absorption method using a amine solvent and 3.31 GJ/$tonCO_2$ as a regeneration energy in the stripper, the net power efficiency was reduced from 41.0% (without $CO_2$ capture) to 31.6% (with $CO_2$ capture) and the levelized cost of electricity was increased from 45.5 USD/MWh (Reference case, without $CO_2$ capture) to 73.9 USD/MWh (With $CO_2$ capture) and the cost of $CO_2$ avoided was estimated as 41.3 USD/$tonCO_2$.

• Journal of The Korean Association For Science Education
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• v.32 no.4
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• pp.775-788
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• 2012

This study was done at a scientific camp sponsored by Nara Women's University Secondary School, Japan. In this school, $10^{th}$ grade students from 4 East Asian countries: Korea, Japan, Taiwan, and Singapore, participated. We made a research on students' perceptions about nuclear energy. Sample populations include 77 students in total, with 12 Korean, 46 Japanese, 9 Taiwanese and 10 Singaporean students. Overall perceptions comparison about nuclear energy shows average values from the order of highest Korea, Taiwan, Singapore, and to lowest, Japan. We implemented a T-test to identify perception differences about nuclear energy, with one group that include 3 countries (Korea, Taiwan and Singapore) and another group that includes all the Japanese students. T-test results of perceptions about nuclear energy shows students from the 3 countries of Korea, Taiwan and Singapore having higher average than Japanese students. (p<.05). Korean average scores regarding overall perceptions about nuclear energy show as the highest in all 4 East Asian countries and also highest in all subcategories. On the contrary in Japan, they have lower and negative perceptions of nuclear energy. In spite of these facts, perceptions of Japanese students about nuclear energy seem lowest and negative mainly because of the recent Fukushima nuclear power plant disaster, caused by the tsunami and its subsequent damages and fears of radiation leaks, etc. This shows that negative information about future disasters and its resulting damages like the Chernobyl nuclear accident could influence more on people's risk perception than general information like nuclear energy-related technologies or the news that the plant is operating normally, etc. Even if the possibility of this kind of accident is very low, just one accident could bring abnormal risks to technology itself. This strong signal makes negative image and strengthens its perceptions to the people. This could bring a stigma about nuclear energy. This study shows that Government's policy about the highest priority for nuclear energy safety is most important. As long as such perception and decision are fixed, we found that it might not be easy to get changed again because they were already fortified and maintained.