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류경하,김재형,이태현,이상혁,반병민,Ryu, Kyung-Ha,Kim, Jae-Hyoung,Lee, Tae-Hyun,Lee, Sang-Hyuk,Bahn, Byoung-Min 대한기계학회 2015 대한기계학회 논문집 C. 기술과 교육 Vol.3 No.4
원자력 발전이 중요한 에너지 공급역할을 담당하기 위해서는 안전성을 확보하고, 사용 후 핵연료 문제를 해결하여야 한다. 이와 같은 문제를 해결하기 위한 방안으로 소듐이나 납비스무스 공융합금 등과 같은 액체금속을 냉각재로 이용하는 방안이 연구되고 있다. 본 논문에서는 액체금속 유동모사 실증 설비 개발을 위한 설계변수 검토, 설계 해석, 구조재의 선정 및 설비 개발 결과를 서술하였다. 설비의 개발은 열수력 해석코드의 해석을 통해 수행되었고 충분한 자연순환 유량을 갖는 설비제작 기술을 확보하였다. To maintain sustainability of nuclear energy as an important energy source, both safety problem and Spent Nuclear Fuels(SNFs) problem should be solved. In case of Gen-IV reactors such as fast reactor, SNFs can be used as fuels by using fast neutrons. It can be a suitable treatment method of high-level waste in near future. Liquid metals such as Sodium or Lead-Bismuth Eutectic (LBE) can be possibly used as a coolant to use fast neutrons. In this paper, it was described that natural circulation parameter studies, design analyses, material selections and a completion of facilities. To develop a natural circulation facility, thermal hydraulic analyses were performed. Installation technique of liquid metal natural circulation were secured.
류경하,이태현,박종원,권혁성,강보식 사단법인 유공압건설기계학회 2022 드라이브·컨트롤 Vol.19 No.4
The performance and reliability of foreign servomotors and domestic servomotors for manufacturing robots were compared and verified. The mass productivity was confirmed by satisfying the requirements of the demanding companies. The servomotor was designed in consideration of mass productivity while satisfying the requirements of the demanding company. It was mounted on a real robot to check its performance and reliability. To secure mass-production performance, we designed and manufactured easy-to-manufacture parts and jigs to manufacture servomotors and achieved the goal of the mass-production evaluation of servomotors through individual performance evaluation, robot mounting test evaluation, and supplementation.
사회초년생의 평가염려 완벽주의가 특성불안에 미치는 영향: 부적응적 인지정서조절 전략과 속박감의 이중매개효과
류경하,김종남 한국건강심리학회 2019 한국심리학회지 건강 Vol.24 No.4
The purpose of this study was to investigate the effect of maladaptive cognitive emotion regulation strategy and entrapment in the relationship between evaluative concerns perfectionism and trait anxiety. Also, this study focused on identifying the mediating effects of evaluative concerns perfectionism and trait anxiety with non-adaptive cognitive emotion regulation strategy and entrapment categorized into internal and external entrapment. The Multidimensional Perfectionism Scale(HMPS), Multidimensional Perfectionism Scale(FMPS), Cognitive Emotion Regulation Questionnaire(CERQ), Entrapement Scale(ES), State-Trait Anxiety Inventory(STAI) were used as measurements. The data from 324 new employees were used for analysis. The results of this study can be summarized as follows. First, evaluative concerns perfectionism showed a significant positive correlation with maladaptive cognitive and emotion regulation strategy and entrapment. Also maladaptive cognitive emotion regulation strategy showed a significant positive correlation with entrapment and trait anxiety. Additionally, evaluative concerns perfectionism showed a significant positive correlation with trait anxiety. Second, evaluative concerns perfectionism had a direct effect on trait anxiety as well as an indirect effect on trait anxiety via maladaptive cognitive emotion regulation strategy, and internal, external entrapment. So, maladaptive cognitive emotion regulation strategy, and internal, external entrapment had a dual mediating effect between evaluative concerns perfectionism and trait anxiety. Based on the results of this study, the implications and limitations of this study were discussed with suggestions for the further study. 본 연구는 사회초년생의 평가염려 완벽주의 성향과 특성불안의 관계에서 부적응적 인지정서조절전략 및 속박감이 미치는 영향을 확인하고자 하였다. 더 나아가 속박감을 내적, 외적 속박감으로 나누어 각각이 부적응적 인지정서조절 전략과 함께 평가염려 완벽주의와 특성불안에 미치는 이중매개효과를 확인하고자 하였다. 이를 위해 사회초년생 370명을 대상으로 평가염려 완벽주의 척도, 부적응적 인지정서조절 전략 척도, 속박감 척도, 특성불안 검사를 실시하였다. 이들 중 불성실한 응답자의 자료를 제외하고 324명의 자료가 최종분석에 사용되었다. 분석 결과 평가염려 완벽주의는 부적응적 인지정서조절 전략, 속박감과 정적 상관을 보였으며 부적응적 인지정서조절 전략은 속박감, 특성불안과 정적 상관을 보였고, 속박감은 특성불안과 유의한 정적 상관을 가졌다. 또한 평가염려 완벽주의와 특성불안과의 관계에서 부적응적 인지정서조절 전략과 내적, 외적 속박감의 이중매개효과를 검증한 결과, 부분이중매개효과가 확인되었다. 이러한 결과는 추후 평가염려 완벽주의자의 특성불안에 대한 치료의 효과성을 높이기 위해 부적응적 인지정서조절 전략을 긍정적 인지정서조절 전략으로 바꾸고 내적, 외적 속박감을 감소시키는 방법에 주목할 필요가 있음을 시사한다. 끝으로 본 연구결과를 바탕으로 연구의 의의와 더불어 제한점을 제시하였다.
류경하,송인영,이태현,이상혁,김영중,김지현 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.5
To evaluate equipment survivability of the polymer Viton, used in sealing materials, the effects of itsthermal degradation were investigated in severe accident (SA) environment in a nuclear power plant. Viton specimens were prepared and thermally degraded at different SA temperature profiles. Changes inmechanical properties at different temperature profiles in different SA states were investigated. Thethermal lag analysis was performed at calculated convective heat transfer conditions to predict theexposure temperature of the polymer inside the safety-related equipment. The polymer that was thermallydegraded at postaccident states exhibited the highest change in its mechanical properties, such astensile strength and elongation
Numerical investigation on the hydraulic loss correlation of ring-type spacer grids
류경하,신용훈,조재현,허정호,이태현,박종원,박재영,강보식 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
An accurate prediction of the pressure drop along the flow paths is crucial in the design of advancedpassive systems cooled by heavy liquid metal coolants. To date, a generic pressure drop correlation overspacer grids by Rehme has been applied extensively, which was obtained from substantial experimentaldata with multiple types of components. However, a few experimental studies have reported that thecorrelation may give large discrepancies. To provide a more reliable correlation for ring-type spacer grids,the current numerical study aims at figuring out the most critical factor among four hypothetical parameters,namely the flow area blockage ratio, number of fuel rods, type of fluid, and thickness of thespacer grid in the flow direction. Through a set of computational fluid dynamics simulations, weobserved that the flow area blockage ratio dominantly influences the pressure loss characteristics, andthus its dependence should be more emphasized, whereas the other parameters have little impact. Hence, we suggest a new correlation for the drag coefficient as CB ¼ Cv,m/ε2.7, where Cv,m is formulated bya nonlinear fit of simulation data such that Cv,m ¼ 11.33 ln(0.02 ln(Reb))