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STELLA-2 소듐 시험 시설 고온 배관 계통의 설계 및 건전성 평가
손석권(Seok-Kwon Son),이형연(Hyeong-Yeon Lee),주용선(Yong-Sun Ju),어재혁(JaeHyuk Eoh),김종범(Jong-Bum Kim),정지영(Ji-Young Jeong) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.9
본 연구에서는 한국원자력연구원이 개발 중인 소듐 열유동 종합효과 시험장치(STELLA-2)의 주요 배관 계통을 대상으로 고온 설계를 수행하고, 두 가지 설계기술기준에 따라 배관의 건전성 평가를 수행하였다. 배관 설계기술기준으로는 일반 압력배관에 관한 ASME B31.1과 프랑스의 원자력등급 배관 설계기술기준인 RCC-MRx RD-3600을 적용하였으며, 이들 기술기준의 보수성을 정량적으로 비교 및 분석하였다. STELLA-2 소듐시설에서는 모의 잔열제거계통(Model DHRS), 모의 중간열전달계통(Model IHTS) 및 펌프 모의계통(PSLS)에 배관이 설치되는데, 두 설계기술기준을 따라 이들 배관 계통에 대해 건전성 평가를 수행한 결과 설계 건전성이 확인되었으며, 설계 기술기준 간 비교분석 결과 유지하중에 대해서는 ASME B31.1이, 열하중에 대해서는 RCC-MRx RD-3600이 더 보수적인 것으로 평가되었다. In this study, elevated temperature design and integrity evaluation have been conducted using two different piping design codes for the high-temperature piping systems of sodium integral effect test loop for safety simulation and assessment(STELLA-2) being developed by KAERI(Korea Atomic Energy Research Institute). The design code of ASME B31.1 for power piping and French nuclear grade piping design guideline, RCC-MRx RD-3600 were applied, and conservatism of those codes was quantified based on the piping integrity evaluation results. The piping system of Model DHRS, Model IHTS and PSLS are to be installed in STELLA-2. The integrity evaluation results for the three piping systems according to the two design codes showed that integrity of the piping system was confirmed. As a code comparison result, ASME B31.1 was shown to be more conservative for sustained loads while RD-3600 was more conservative for thermal loads compared to B31.1.
An Analysis of Research Trends of Domestic Mathematics Struggling Learners Using Topic Modeling
손태권(Tae-Kwon Son)안도연(Do-Yeon Ahn),유성윤(Sung-Yoon Yoo),이광호(Kwang-Ho Lee) 한국교원대학교 뇌기반교육연구소 2021 Brain, Digital, & Learning Vol.11 No.1
Mathematics struggling learners are an important agenda to be solved in mathematics education and the country. Our research purpose is that understand the research trends on mathematics struggling learners have been categorized and flowed. In consideration of this purpose, we examined 782 domestic papers published from 1980 to 2019 using topic modeling to identify the research trend of mathematics struggling learners. The findings indicated that there were different core keywords by period. Additionally, six topics were derived such as ‘Struggling Factors’, ‘Programs for Struggling Learner’, ‘Learning Fractions’, ‘Errors of Struggling Learner’, ‘Instruction Methods’, ‘Supplementary Materials & System’. Additionally, each topic showed a different weight change according to the time series change and hot topics appeared as a teaching method. Based on these findings, we suggest implications for educators and researchers. First, research for struggling learners in other areas of mathematics should be spread. Second, research on the diagnosis of underachievers in mathematics learning needs to be spread. Third, research on social and cultural variables that cause struggling learners in mathematics learning needs to be spread.
손태권(Tae-Kwon Son),이광호(Kwang-Ho Lee),성창근(Chang-Keun Sung) 한국교원대학교 뇌기반교육연구소 2019 Brain, Digital, & Learning Vol.9 No.3
The purpose of this study is to suggest the direction of the development of the working memory assessment tool based on Baddeley(2018)’s working memory multicomponent model. To do this, we first examined the concept of working memory and neurological basis through literature review, and selected measurement factors for development of working memory assessment tool. Based on the selected measurement factors, we analyzed the developed tasks of working memory tools and revealed its characteristics and limitations. We suggest the points to be considered by the developer and the assessment tool user when developing or using the work memory assessment tool and suggested suitable tasks for each work memory measurement factors. This study is significant in that it establishes the neurological basis of working memory and suggests the points to be considered by the developers and the authors, thereby providing a basis for the development of the working memory assessment tool.