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Uniformity of Droplet of Eutectic NaCl-MgCl2 System for Corrosion Test of Coating Layer
Wonseok Lee,Wonseok Yang,Jihun Kim,Hyeongbin Kim,Taeho Jang,Sungyeol Choi 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
Corrosion-related challenges remain a significant research topic in developing next-generation Molten Salt Reactors (MSRs). To gain a deeper understanding of preventing corrosion in MSRs, previous studies have attempted to improve the corrosion resistance of structural alloys by coating surfaces such as alumina coating. To conduct a corrosion test of coating alloys fully immersed in molten salt, it’s important to ensure that the coating application process is carefully carried out. Ideally, coating all sides of the alloy is necessary to avoid gaps like corners of the alloy, while only applying a one-sided coating alloy can lead to galvanic corrosion with the base metals. Using the droplet shape of eutectic salt applied to only one side of the coating alloy would avoid these problems in conventional corrosion immersion tests, as corrosion would occur solely on the coating surface. Although the droplet method for corrosion tests cannot fully replicate corrosion in the MSRs environment, it offers a valuable tool for comparing and evaluating the corrosion resistance of different coating surfaces of alloys. However, the surface area is important due to the effect of diffusion in the corrosion of alloy in molten salt environments, but it is difficult to unify in the case of droplet tests. Therefore, understanding the droplet-alloy properties and corrosion mechanism is needed to accurately predict and analyze these test systems’ behavior highlighting unity for corrosion tests of different coating surfaces of alloys. To analyze the molten salt droplet behavior on various samples, pelletized eutectic NaCl-MgCl2 was prepared as salt and W-, Mo-coating, and base SS316 as samples. At room temperature, the same mass of pelletized eutectic NaCl-MgCl2 was placed on different samples under an argon atmosphere and heated to a eutectic point of 500°C in a furnace. After every hour, the molten droplets were hardened by rapid cooling at room temperature outside the furnace. The mass loss of salts and the contact area of the samples were measured by mass balance and SEM. The shape, surface area to volume ratio, and evaporation of the droplets of NaCl-MgCl2 per each coating sample and hour were analyzed to identify the optimal mass to equalize the contact coating surface of alloys with salts. Furthermore, We also analyzed whether their results reached saturation of corrosion products through ICP-MS. This will be significant research for the uniformity of the liquid-drop shape corrosion test of the coating sample in molten eutectic salts.
초등학교 태권도 수련생들의 참여동기가 신체적 자기효능감 및 사회성에 미치는 영향
장원석 ( Jang Wonseok ),이재봉 ( Lee Jeabong ) 한국체육대학교 체육과학연구소 2020 스포츠사이언스 Vol.38 No.2
본 연구는 초등학생 태권도장 수련생들을 대상으로 태권도 참여동기와 신체적 자기효능감 및 사회성 수준을 파악하고, 태권도 참여동기와 신체적 자기효능감 및 사회성 간의 영향관계를 검증하는데 그 목적이 있다. 이에 초등학교 태권도 수련생 160명을 대상으로 설문조사를 수행하였으며, SPSS 26.0 프로그램을 이용하여 통계적 분석을 수행하였다. 본 연구의 주요 연구결과를 제시하면 다음과 같다. 첫째, 초등학교 태권도 수련생들의 참여동기가 이들의 신체적 자기효능감에 미치는 영향을 검증한 결과, 초등학교 태권도 수련생들의 참여동기 요인 중 건강증진, 자기계발, 여가활동 요인이 인지된 신체능력에 유의미한 정(+)의 영향을 미치는 것으로 나타났다. 한편, 초등학교 태권도 수련생들의 참여동기 요인 중 건강증진과 자기계발 요인이 신체적 자기표현 자신감에 유의미한 정(+)의 영향을 미치는 것으로 나타났다. 둘째, 초등학교 태권도 수련생들의 신체적 자기효능감이 사회성에 미치는 영향을 검증한 결과, 초등학교 태권도 수련생들의 신체적 자기효능감 요인인 인지된 신체능력과 신체적 자기표현 자신감 요인 모두 사회성에 유의미한 정(+)의 영향을 미치는 것으로 나타났다. 셋째, 초등학교 태권도 수련생들의 참여동기가 사회성에 미치는 영향을 검증한 결과, 초등학교 태권도 수련생들의 참여동기 요인 중 즐거움, 자기계발, 여가활동 요인이 사회성에 직접적으로 유의미한 정(+)의 영향을 미치는 것으로 나타났다. The purpose of this study is to identify the motivation for participation in Taekwondo, the level of physical self-efficacy and sociality, and to verify the relationship between the motivation for participation in Taekwondo and the effect between physical self-efficacy and sociality for elementary school trainees. A survey was conducted on 160 Taekwondo trainees in elementary schools and a statistical analysis was conducted using the SPSS 26.0 program. The main findings of this study are presented as follows. First, the results of verifying the effect of the participation motivation of elementary school Taekwondo trainees on their physical self-efficacy showed that among the factors of the participation motivation of elementary school Taekwondo trainees, health promotion, self-development and leisure activities had significant effects on the perceived physical ability. Meanwhile, among the factors of the motivation for participation, health promotion and self-development factors were found to have significant effects on physical self-expression confidence. Second, as a result of verifying the effect of physical self-efficacy on sociality of elementary school Taekwondo trainees, both perceived physical ability and physical self-expression confidence factors, which are factors of physical self-efficacy of Taekwondo trainees in elementary school have significant effect on sociality. Third, as a result of verifying the effects of the participation motivation of elementary school Taekwondo trainees on their sociality, the factors of pleasure, self-development, and leisure activities among the factors of Taekwondo trainees in elementary school directly affect sociality.
SWAT HRU의 공간적인 지형 특성을 고려한 유사평가 분석
장원석 ( Jang Wonseok ),유동선 ( Yoo Dongseon ),박윤식 ( Park Younshik ),김종건 ( Kim Jonggun ),최중대 ( Choi Joongdae ),임경재 ( Lim Kyoung Jae ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-
There are wide ranges of hydrologic and water quality models available. Among those the watershed scale Soil and Water Assessment Tool (SWAT) has been widely used, compared with other models because of its prediction accuracy and functionalities in simulating the runoff, sediment, nutrient, and pesticide at spatial and temporal context. The SWAT model, semi-distributed model, first divides the watershed into multiple subwatersheds, and then extracts the basic computation element, called the Hydrologic Response Unit (HRU) with land use and soil maps. In the process of HRU generation, the spatial information of land use and soil maps within each subwatershed is lost because the SWAT model is semi-distributed model. In other words, the areas with the same land use and the same soil are grouped into one single HRU within each subwatershed although its topographic features are significantly different. The SWAT model estimates the HRU topographic data based on the average slope of each subwatershed, and then use these topographic data for all HRUs within the subwatershed. To improve the SWAT capabilities for various watershed scenarios, the Spatially-Distributed HRU (SD-HRU) module was developed in this study to simulate site-specific topographic data, instead of using the same topographic data for all HRUs. The SD-HRU was applied to the Hae-an watershed, where field slope lengths and slopes are measured for all agricultural fields to examine the necessity of using the SD-HRU in accurate sediment simulation using the SWAT model. It was found that the simulated sediment decreased by 26 %, compared with currently available SWAT model and decreased by 68 %, compared with the result using SWAT area-weighted slope and slope length module. The analysis revealed that the SD-HRU module needs to be applied in SWAT sediment simulation for accurate analysis of soil erosion and sediment behaviors. If the SD-HRU module is not applied in SWAT runs, the other SWAT factors may be over or under estimated, resulting in errors in physical and empirical computation modules although the SWAT estimated flow and sediment values match the measured data reasonably well.