http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 윤현기 (검색결과 189 건)
- 무료
- 기관 내 무료
- 유료
-
윤현기,탁혜영,이창문,변헌수,윤순도 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
In this work, biodegradable films were prepared by using jerusalem artichoke-JA, mungbean starch-MBS, polyvinyl alcohol-PVA, and plasticizers( glycerol-GL, citric Acid-CA, and ascorbic Acid-AsA). The prepared films were synthesized by using UV curing process. The films were characterized by scanning electron microscope-SEM and fourier transform infrared(FT-IR). The physical/optical properties of the films was investigated including their tensile strength-TS, elongation at break-%E, swelling behavior-SB, solubility-S, and water vapor absorption. The results, it could be verified that TS and water resistance were improved by the addition of JA. In addition, the biodegradability in soil and applicability of the coating on a fruit were evaluated. The degree of biodegradability revealed that the films are degraded by about 40-80% after 170days. When compared with the decomposition of an uncoated apple and a coated apple revealed that even after 70 days, the coated apple did not decompose.
-
-
윤현기 기독교통일학회 2021 기독교와 통일 Vol.12 No.1
North Korean defectors live with trauma for the psychological shock they experienced during defection and the pain they went through at the crossroads of life and death. Various studies on their trauma have followed one after another. The latest ones include “Effects of Domestic Violence on Mental Health of Victimized Female North Korean Defectors” (Cho Sung-hee et al., 2019). This study is to look into North Korean defectors’ mental health-related difficulties increasing in the contactless way of life caused by the sudden COVID-19 outbreak. This study utilizes existing studies and literature studies on factors affecting North Korean defectors’ mental health during their empirical settlement in the two Korean societies. This study examines the background of mental health they experienced in the closed North Korean society and their settlement process in South Korea and seeks measures for their mental health stability. The analysis was conducted by referring to the “Emergency Survey: North Korean Defectors’ Society in COVID-19” seminar of Radio Free Asia and Saejowi Initiative for National Integration in November 2020 and an online seminar Hanawon and National Mental Health Center hosted in December. According to the result of the analysis, the threat of unemployment attributable to economic difficulties, loneliness, and social relations are three of the factors that threaten North Korean defectors’ mental health amid COVID-19. In view of their negative mental health status and its seriousness in the pandemic era, the conclusion of this study presents cases and roles of relevant institutions and organizations, South Korean churches in particular. 탈북민들은 탈북과정에서 얻은 심리적 충격과 생과사의 갈림길에서 경험한 고통으로 트라우마를 가지고 살아간다. 탈북민들의 트라우마에 관한 연구는 꾸준히 이어져 왔다. 최근의 연구로 “북한이탈여성의 가정폭력피해가 정신건강에 미치는 영향”등 다양하다. 본 연구는 급작스럽게 닥친 코로나로 비대면 문화속에 심화되어지는 탈북민 정신건강의 어려움에 대해 살펴본다. 본 연구는 탈북민들의 경험적 북한사회와 한국사회 정착에서 정신건강에 영향을 미치는 요인에 대해 기존의 연구와 문헌연구를 활용하였다. 탈북민들이 폐쇄된 북한사회에서, 한국사회 정착과정에서 겪은 정신건강의 배경에 대해 알아보고 탈북민들의 안정적인 정신건강의 방안을 모색하였다. 2020년 11월 자유아시아방송, 새조위가 실시한 “긴급설문: 코로나19속 탈북민 사회”세미나와 12월 하나원, 국립정신건강센터가 주최한 온라인 세미나를 참조하여 분석하였다. 분석결과 코로나이후 탈북민들의 정신건강에 위협을 미치는 요소는 첫째, 경제적 어려움으로 인한 실직에 대한 위협, 둘째, 외로움, 셋째 사회관계성이다. 결론에서는 코로나시대 탈북민들의 부정적인 정신건강의 실태와 심각성에 비추어 관련기관, 단체, 특히 한국교회의 사례와 역할을 제시하였다.
-
-
-
Discharge header design inside a reactor pool for flow stability in a research reactor
윤현기,최용석,서경우,김성훈 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.10
An open-pool type research reactor is designed and operated considering the accessibility around the pool top area to enhance the reactor utilization. The reactor structure assembly is placed at the bottom of the pool and filled with water as a primary coolant for the core cooling and radiation shielding. Most radioactive materials are generated from the fuel assemblies in the reactor core and circulated with the primary coolant. If the primary coolant goes up to the pool surface, the radiation level increases around the working area near the top of the pool. Hence, the hot water layer is designed and formed at the upper part of the pool to suppress the rising of the primary coolant to the pool surface. The temperature gradient is established from the hot water layer to the primary coolant. As this temperature gradient suppresses the circulation of the primary coolant at the upper region of the pool, the radioactive primary coolant rising up directly to the pool surface is minimized.Water mixing between these layers is reduced because the hot water layer is formed above the primary coolant with a higher temperature. The radiation level above the pool surface area is maintained as low as reasonably achievable since the radioactive materials in the primary coolant are trapped under the hot water layer. The key to maintaining the stable hot water layer and keeping the radiation level low on the pool surface is to have a stable flow of the primary coolant. In the research reactor with a downward core flow, the primary coolant is dumped into the reactor pool and goes to the reactor core through the flow guide structure. Flow fields of the primary coolant at the lower region of the reactor pool are largely affected by the dumped primary coolant. Simple, circular, and duct type discharge headers are designed to control the flow fields and make the primary coolant flow stable in the reactor pool. In this research, flow fields of the primary coolant and hot water layer are numerically simulated in the reactor pool. The heat transfer rate, temperature, and velocity fields are taken into consideration to determine the formation of the stable hot water layer and primary coolant flow. The bulk Richardson number is used to evaluate the stability of the flow field. A duct type discharge header is finally chosen to dump the primary coolant into the reactor pool. The bulk Richardson number should be higher than 2.7 and the temperature of the hot water layer should be 1 C higher than the temperature of the primary coolant to maintain the stability of the stratified thermal layer.
-
-
-
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
