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A study of food preference and demand for development of easy swallowing ‘Care Food’ products
Dahyeon Ko,Hayoung Jang,Hyeongyeong Kim,Joohee Lee,Juyeon Park,Soyoung Joo,Jieun Oh,Mi Sook Cho 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Dysphagia is a significant cause of under-nutrition in elderly. This study investigated dysphagia patients’ food preference and demand for development of easy swallowing care food product(ESCF). A survey was conducted on 124 participants(62 dysphagia group, 62 control group) for dietary attributes, purchasing attributes of care food, demand of menu types and preference of food groups. Dysphagia group feel uncomfortable with swallowing(45.2%). Long meal time(33.9%) and low diversity of edible foods(32.2%) are also the inconvenience factors. When purchasing care food for elderly, safety properties are the most important in both(6.02±1.25, 5.78±1.88). The highest demand of menu types is main dishes(53.2%) and the most preferred food group is fruit(3.95±0.91) in dysphagia group. In control group, side dishes(48.4%) is the highest and fruit(3.83±0.97) is the most. It shows that elderly dysphagia patients need more various ESCF products for their health. This work was carried out with the support of ‘High Value-Added Food Technology Development Project’ in INSTITUTE OF PLANNING AND EVALUATION FOR TECHNOLOGY IN FOOD, AGRICULTURE AND FORESTRY.
Spent Fuel Characteristics of Small Modular Reactors and Its Management Implications
Dahyeon Woo,Chansoo Lee,Youho Lee 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
Since SMR’s reduced reactor radius results in higher neutron leakage, SMR operates at a relatively lower discharge burnup level than traditional Light Water Reactors (LWRs). It may result in larger spent fuel amounts for SMRs. Furthermore, recent studies demonstrated that NuScale reactor will generate a significantly higher volume of low- and intermediate-level waste owing to components located near the active core including the core barrel and the neutron reflector. For spent nuclear fuel simulation, FRAPCON-4.0 was updated. Major modifications were made for fission and decay gas release, pellet swelling, cladding creep, axial temperature distribution, corrosion, and extended simulation time covering from steady-state to dry storage. In this study, typical 17×17 PWR fuel (60 MWd/kgU) and NuScale Power Module (36 MWd/kgU) was compared. NuFuel-HTP2™ fuel assembly, which has a half-length of proven LWR fuel, was employed. Owing to the lower discharge burnup and operating temperature, the maximum hydrogen pickup was 73 wppm and the maximum hoop stress was ~25 MPa. Therefore, hydride reorientation issue is irrelevant to SMR spent fuel. In this context, the current regulatory limit for dry storage (i.e. 400°C and 90 MPa) can be significantly alleviated for LWR-based SMRs. The increased safety margin for SMR spent fuel may compensate high spent fuel management cost of SMRs incurred by an increased amount. The comprehensive analysis on SMR spent fuel management implications are discussed based on simulated SMR fuel characteristics.
Dahyeon Woo,Youho Lee 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
Hydride reorientation is one of the major concerns for cladding integrity during dry storage. In this study, mechanical property of post-reorientation cladding was investigated according to the morphology and amount of the hydrides. Cladding peak temperature limit 400°C was suggested by U.S. NRC in concern of cladding creep and hydride reorientation. In line with this regulatory limit, hydride reorientation was conducted during cool-down process from the maximum temperature of 400°C, using constant internal pressurization method. The specimens were charged for hydrogen from 100 to 1,000 wppm, and various pressures range of 7.5-18.5 MPa were applied. The morphology was examined by optical microscopy. Radial hydride fraction (RHF) and radial hydride continuous path (RHCP) were calculated using image analysis software PROPHET. Finally, strain energy density (SED) was investigated via ring compress tests and the hydrogen concentration was analyzed. The result shows that when RHF is higher than 5%, SED exponentially decreases with RHF. For RHF less than 5%, SED was primarily affected by the total amount of hydrogen. Shortened length of radial hydrides with the presence of circumferential hydrides may block the radial propagation of crack. The result implies that lower burnup spent fuel with lower hydrogen concentration may be more vulnerable in terms of radial hydride compared to higher burnup fuel.
Dahyeon Woo,Joo-Hee Kang,Jarugula Rajesh,Youho Lee 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
Hydride reorientation is widely known as one of the major degradation mechanisms in Zirconium cladding during dry storage. Some previous theoretical models for hydride reorientation used assumption of an ideal radial basal pole orientation for HCP structure of Zirconium cladding. Under this assumption, circumferential hydride was considered to precipitate in the basal plane while radial hydride was considered to precipitate in the prismatic plane, thereby giving energetical penalty on thermodynamical precipitation of radial hydrides. However, in reality, reactor-grade Zirconium cladding exhibits average 30° tilted texture, adding complexity to the hydride precipitation mechanism. In this study, reactor-grade Zirconium cladding was charged with hydrogen and hydride reorientation -treated specimens were fabricated. Microstructural characterization of hydrides was conducted via following three methods in terms of interface and stored energy. And this study aimed to compare these characteristics between circumferential and radial hydrides. Using Electron Back Scattered Diffraction (EBSD), the interface was investigated assuming that interface lies parallel to the axial axis of the tube. These were further validated with Transmission Electron Microscope (TEM). In addition, Differential Scanning Calorimetry (DSC) analysis was conducted to calculate the stored energy. This investigation is expected to establish fundamental understanding of how hydrides precipitate in Zirconium cladding with different orientations. And it will also increase the predictability of radial hydride formation and help understanding the mechanical behavior of Zirconium cladding with radial hydrides.
실시간 마커 이미지 추출 기법을 이용한 컬러링 증강현실 콘텐츠
강다현 ( Dahyeon Kang ),최충현 ( Chunghyun Choe ),김난희 ( Lanhee Kim ),이승현 ( Seunghyun Lee ),이창환 ( Changhwan Yi ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.2
현재 많은 증강현실 콘텐츠는 장면에 따른 미리 지정된 3D 모델을 표시하고 있다. 이렇게 고정된 모델만 표시하는 콘텐츠는 짧은 사용시간을 가지게 된다. 본 논문에서는 증강현실 콘텐츠의 사용시간을 늘리기 위해 증강현실의 마커 이미지를 실시간으로 추출하는 기법을 이용한 컬러링 종이 증강현실 콘텐츠를 제작하였다. 이 콘텐츠는 사용자가 컬러링 종이에 있는 도면에 채색하면, 채색된 도면의 내용을 반영한 3D 모델을 표시하는 증강현실 콘텐츠이다.
대학생의 주체성과 주체적 참여의 관계에서 학업 회복력의 매개효과
홍다현(Dahyeon Hong),기희경(Heekyung Kee),김정섭(Jungsub Kim) 중앙대학교 한국교육문제연구소 2021 한국교육문제연구 Vol.39 No.3
이 연구의 목적은 대학생의 주체성이 대학생활 및 학업 활동에서의 주체적 참여에 영향을 미치는 과정에서 학업 회복력의 매개효과를 알아보는 것이다. 이를 위해 부산광역시에 소재한 대학교의 남·여 대학생 314명의 자료를 바탕으로 주요 변인 간의 상관관계 분석과 구조방정식 모형을 검증하였다. 이 연구의 주요 결과는 다음과 같다. 첫째, 주체성, 학업 회복력, 주체적 참여는 유의미한 정적 상관이 나타났다. 둘째, 대학생의 주체성과 주체적 참여의 관계에서 학업 회복력은 부분매개 효과를 가지는 것으로 나타났다. 이는 대학생의 주체적 참여 수준을 높이기 위해서는 주체성과 학업 회복력이 매우 중요한 변인임을 보여준다. 이 연구는 이러한 연구결과를 바탕으로 대학생의 주체적 참여 향상을 위한 주체성과 학업 회복력의 중요성과 시사점을 논의하였다. The purpose of this study was to investigate the mediating effect of academic buoyancy in the relationship between agency and agentic engagement of university students. For this purpose, the data from 314 university students in Busan were analyzed for statistical results using SPSS 25.0 and AMOS 25.0. The main results of this study are as follows. First, there was a significant positive correlation between agency, academic buoyancy, and agentic engagement. Second, academic buoyancy had a partially mediating effect in the relationship between agency and agentic engagement of university students. This shows that agency and academic buoyancy are very important variables to increase the level of active participation of university students. Based on these results, this study discussed the importance and implications of agency and academic buoyancy for improving the agentic engagement of university students.