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가변 밸브 타이밍(VVA) 기구를 이용한 차세대 연소방식의 연구
현기수(Gisoo Hyun),정찬승(Chansung Chung),두병만(Byungman Doo),구영곤(Younggon Ku) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For this study, a Premixed Charged Compression Ignition (PCCI) Combustion was applied in a Heavy duty Diesel Engine, and has been experimentally investigated from the standpoint of its operating area extension to higher loads and engine performance, such like fuel consumption and emission, improvement. A Variable Valve Actuation (VVA) system was adopted to change the variables of intake and exhaust valve system such like opening, closing timing and valve lift profile. For controlling combustion timing which is a major difficulty for PCCI combustion engine realization, intake vale opening timing was advanced or retarded, and accordingly the effect of Miller cycle was evaluated. As a result, an ideal combustion can be achieved under controlling ignition timing and reducing effective compression ratio by using VVA system.
COVID-19 범유행 시기 일반병동 간호사의 피로도와 전문직 삶의 질과의 상관관계
정현선,신기수,Jung, Hyun-Sun,Shin, Gisoo 경희대학교 동서간호학연구소 2023 동서간호학연구지 Vol.29 No.1
Purpose: The new infectious disease, COVID-19, is not over yet. The study aimed to identify the correlation between fatigue and professional quality of life among nurses in general wards during the COVID-19 pandemic. Methods: A cross-sectional design was used targeting 138 nurses in a tertiary general hospital located in Chungcheongnam-do from November 1 to 3, 2020. Results: The average age of the participants was 30.64 and the score of fatigue was 3.27. For the scores of subscales of professional life quality were 31.41 for compassion satisfaction, 27.12 for compassion fatigue, and 29.43 for burnout. The scores of fatigue were significantly correlated with compassion fatigue and burnout. Conclusion: Based on the results of this study, it is necessary to expand the region and sample to investigate COVID-19 related fatigue and quality of professional life in nurses. In addition, it is necessary to seek interventions that can improve the quality of professional life for nurses.