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공압시스템 제습용 중공사막 모듈의 하우징 형태에 따른 제습효율 특성 연구
정은아,이기윤,윤소남 사단법인 유공압건설기계학회 2019 드라이브·컨트롤 Vol.16 No.2
In this study, flow analysis and dehumidification experiments were performed on hollow fiber membrane module to confirm the dehumidification characteristics for its different configurations. The CFD for the three different models was conducted using 30℃ temperature and 30%RH inlet humidity for quantitative analysis. Each model has different shape parameters i.e. the number of baffles. Comparison between flow analysis results and dehumidification experiment results revealed a percentage error of about 5%. The difference in relative humidity between the inlet and outlet for each model was calculated using flow analysis data. It was established that the difference in relative humidity of the inlet and outlet for the refined model with three baffles was highest among the three modeled modules of hollow fiber membrane module, i.e. around 9%.
정은아,Haroon Ahmad Khan,윤소남,이기윤 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.10
In this study, a flow analysis and a fluid-solid interaction analysis were performed on a hollow fiber membrane module used for dehumidification of a pneumatic system. To ensure the reliability of the flow analysis results, we performed the dehumidification experiment at a temperature of 30 ◦ C and a relative humidity(RH) of 30% on a module with a similar to that of the analyses. shape only the part containing hollow fiber membranes was considered. Results of the dehumidification experiments were compared with the results of the flow analysis. The results of dehumidification experiments and the flow analysis had a difference of approximately 5%, and although the five models had different grid numbers, the results of flow analysis showed a difference of about 1% in the dehumidification efficiency ensuring the accuracy. A one-way fluid-solid interaction analysis with various materials was performed. From the result, we found that the baffle having the largest shape deformation was the one made of polyethylene material, which was then subjected to a 2-way fluid-solid interaction at 0.53 bar, 1 bar, 5 bar, and 10 bar. The fluid flow and the dehumidification characteristics were determined for different shapes of the deformed baffle. Finally, the effects of three types of flow paths based on the positions of the inlet and the outlet on the baffle deformation and the dehumidification efficiency were studied. We found that dehumidification efficiency was highest when inlet and outlet were positioned in a straight line.
일제시기 신문 스케치사진의 사진사적 연구 - 『동아일보』를 중심으로 -
정은아,박주석 한국사진학회 2022 AURA Vol.- No.48
‘Sketch-sajin’ is photograph published singly on newspapers without articles by journalists who, as a part of their work, take pictures of nature and urban landscapes, everyday life, animals and plants, and so on. In 『Maeil Shinbo』, sketch-sajin appeared together with illustrations in 1911. Sketch-sajin and illustrations showed a close relationship, showing similar forms in material and composition. As public journals by Koreans became available in 1920, Korean public newspapers including『Donga Ilbo』 followed the norm of photographs of 『Maeil Shinbo』. Since the 1930s, sketch-sajin has been actively published and developed in Korean public journals to the extent that one or two pictures are published every day. The subjects can be broadly divided into nature and cities, daily life, and animals and plants. The photographs were mainly expressed with a sense of the seasons and were filmed in the style of ‘yesulsajin’. Most of the photographers who shot the sketch-sajin were photo-journalists employed to newspapers. In the realm of newspapers, sketch-sajin played a role of weather forecast, appreciation, and alleviation of the heavy atmosphere. Some sketch-sajin even reflected social conditions and conveyed political messages. In the field of photography, sketch-sajin has much value as an independent photographic work, contributing to the introduction and diffusion of ‘yesulsajin’ and ‘sinheungsajin’. And sketch-sajin was repeatedly exposed to readers and played a role in spreading the modern visual system. This paper was written with the intention of clarifying the historical process.
정은아,김남일 한국의사학회 2002 한국의사학회지 Vol.15 No.2
The Oriental Obstetrics and Gynecology is a branch of the Oriental Medicine that treat of physiological and pathological diseases of the female. The origin of the Oriental Obstetrics and Gynecology begins at the pregnancy and delivery of the women. Therefore it has significant meanings about the birth of human beings. The field of this study has been very important to the Oriental Medicine. Accordingly the present writer is planning to study of the level of the Oriental Obstetrics and Gynecology and its effects in those days, through Heo Jun(許浚)'s 『Eonhaetaesanjipyo』(『諺解胎産集要』) that is a work of the Oriental Obstetrics and Gynecology books in the history of Korean Oriental Medicine.
또래 괴롭힘 그림책에서 나타난 갈등 해결의 주체와 갈등 상황에 대처하는 방식 분석
정은아,현은자 한국콘텐츠학회 2019 한국콘텐츠학회논문지 Vol.19 No.1
This study aims to look closely picture books regarding bullying and to analyze people directly involved in resolution to bullying problems and conflict-coping method in those picture books. 71 picture books on bullying were examined in this study. Results are as follows: (1) As person directly involved in resolution to bullying problems, ‘victim by himself’ settles a conflict situation over half of the books, followed by ‘victim and other character’ and ‘other character alone’. (2) various types are described relatively evenly such as ‘getting positive mind or building confidence’, ‘distancing bullies group or making new friends’, ‘gaining recognition by showing one's competence off', ‘helping bullies or being nice to bullies’ for conflict-coping method to bullying problems. In conclusion, the necessity of community effort rather than an individual's own effort to solve bullying problems and possibilities of teaching of language use in those books were discussed. 본 연구는 또래 괴롭힘 그림책을 살펴보고 갈등 해결의 주체와 갈등 상황에 대처하는 방식을 분석하는 것을 목적으로 한다. 본 연구는 또래 괴롭힘을 그리고 있는 그림책 71종을 대상으로 하여 분석을 실행하였다. 연구 결과는 첫째, 갈등 해결의 주체를 살펴보았을 때 피해자가 스스로 또래 괴롭힘 문제를 해결하는 경우가 가장 많이 나타났으며 본인과 다른 인물이 함께 해결하기와 다른 인물이 해결하기가 뒤를 이었다. 둘째, 갈등 상황에 대한 대처 방식을 살펴보았을 때 자신감을 증대하거나 긍정적인 심리를 획득하는 것, 가해자 무리를 떠나 새로운 친구를 사귀는 것, 자신의 능력을 선보여 인정을 받는 것, 가해자에게 도움을 주거나 친절히 대하는 것 등 다양한 대처방식이 비교적 고르게 나타났다. 본 연구에서 긍정적으로 여겨지는 대처방식들을 다양하게 제시함으로써 독자들이 이를 바람직한 모델링의 대상으로 삼을 수 있을 것으로 기대된다. 또래 괴롭힘 문제의 해결에서 피해자 본인의 주체성을 강조하되 또래 괴롭힘 문제를 개인이 혼자 풀어야 하는 문제로 치부하기 보다는 사회 공동체적 노력에 대한 필요성, 그리고 그림책을 통한 언어 사용 지도의 가능성을 논의하였다.