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IPA/물 혼합액의 PEI/PDMS 복합막 모듈을 이용한 투과증발 파일롯 분리특성
천봉수,정성일,임지원 한국막학회 2015 멤브레인 Vol.25 No.5
Isopropyl alcohol (IPA)/물의 투과증발 분리특성을 알아보기 위해 상용화된 Polyetherimide (PEI) 중공사막에 Poly(dimethyl siloxane) (PDMS)로 코팅한 복합막 모듈을 이용하여 파일롯 테스트를 실시하였다. 공급액으로는 물과 IPA를 각각 85 : 15로 혼합하여 사용하였다. 실험 결과로 25°C에서 투과도 0.52 kg/m2h, IPA 농도 68.5%로 높은 수치를, 55°C에서 투과도 1.368 kg/m2h, IPA 농도 61.2%로 높은 투과도를 얻을 수 있었다. 테스트를 진행한 복합막 모듈의 내구성을 알아보기 위하여 약 100일간 반응온도를 50°C로 설정하여 장기테스트를 진행하였고 그 결과 약 1.03~1.15 kg/m2h의 투과도와 61.8~62.5%의 IPA 농도로 초기 측정량과 큰 차이가 없음을 나타내었다. To determine the pervaporation separation characteristics of IPA/water mixtures, PEI/PDMS hollow fiber membrane module commercialized by Airrane Co. was subjected to both lab and pilot tests. The flux of 0.52 kg/m2h and IPA concentration of 68.5% at 25°C were obtained whereas the 1.368 kg/m2h and 61.2% were measured at 55°C. In order to realized the durability of the module, the long-term test (at 50°C) of 100 days has been conducted and as a result, the flux 1.03~1.15 kg/m2h and IPA concentration 61.8~62.5% were maintained with the initial values.
Research trends in studies of medical students’ characteristics: a scoping review
정성수,박귀화,노혜린,윤소정,이건호,천경희 한국의학교육학회 2017 Korean journal of medical education Vol.29 No.3
The purpose of this study is to investigate domestic and international research trends in studies of medical students’ characteristics by using the scoping review methods. This study adopted the scoping review to assess papers on the characteristics of medical students. The procedure of research was carried out according to the five steps of the scoping review. The full texts of 100 papers are obtained and are read closely, after which suitable 88 papers are extracted by us for this research. The review is mapped by the year of the study, source, location, author, research design, research subject, objective, and key results. The frequency is analyzed by using Microsoft Excel and SPSS. We found 70 papers (79.5%) on a single medical school, 15 (17.0%) on multiple medical schools, and three (3.4%) on mixed schools, including medical and nonmedical schools. Sixty-nine (79.5%) were cross-sectional studies and 18 (20.5%) were longitudinal studies. Eighty-two papers (93.2%) adopted questionnaire surveys. We summarized research trends of studies on medical students in Korea and overseas by topic, and mapped them into physical health, mental health, psychological characteristics, cognitive characteristics, social characteristics, and career. This study provides insights into the future directions of research for the characteristics of medical students.