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ABS 장착한 승용차의 제동거리 측정 표준안의 비교연구
박용주(Yongjoo Park),탁태오(Taeoh Tak),최성진(Sungjin Choi),이경희(Kyunghee Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Measurment of braking distance for passenger car with ABS system is very complicated process since braking involves interaction among the driver-ear-environment. In this research, two methods for measuring braking distance for ABS equipped vehicle, which are used in KS R 1107[ISO 11835:1995 Road Vehicles - Motor vehicles with antilock braking system - Measurement of braking performance] and ISO/FDIS 21994 Passenger cars - Stopping distance at straight-line braking with ABS - Open-loop test method. respectively. Theoretical differences between two methods are analyzed, and actual measurments are made and compared. Both methods showed similar results and they showed some difference clue to the measuring conditions and method.
이주항(Ju-Hang Lee),박용주(Clara Yongjoo Park) 전남대학교 생활과학연구소 2019 生活科學硏究 Vol.29 No.1
Objectives : Many older adults have gastrointestinal disorders and chronic diseases such as cardiovascular disease (CVD) and diabetes mellitus (DM). Nutrition knowledge and attitude of caregivers who visit and participate in providing meals for the elderly, especially those with chronic diseases, may affect the nutrient intake and health status of the care recipients. The purpose of this study was to investigate general nutritional knowledge and disease-related nutrition knowledge of caregivers and their association with nutrition attitude. Methods : Surveys were conducted by questionnaire either online or offline. Subject characteristics, general nutrition knowledge, disease-related nutrition knowledge (gastrointestinal tract diseases, CVD, and DM), nutrition attitude toward oneself and toward the care-recipient were evaluated. Statistical analyses were performed by χ2-test, Wilcoxon Rank-sum test, Kruskal-Wallis H test, and Spearman’s correlation. Results : Among the 251 caregivers that completed the survey, 76% worked in the homes of the care recipients. Mean age was 57.6(± 8.5) years. Nutrition knowledge was not associated with years of experience as a caregiver or additional nutrition education. Participants’ percentage of correct answers was relatively low for nutrition knowledge that changed over the years. General and disease-related nutrition knowledge of caregivers were positively correlated with nutrition attitude. Caregivers who put top priority on ‘nutrition’ and ‘care recipients disease’ had higher nutrition knowledge. Nutrition attitude was lower towards care recipients compared to that towards ones own intake. Conclusions : Nutrition attitude was positively associated with nutrition knowledge in caregivers, although nutrition knowledge did not differ by additional nutrition education. More effective strategies for caregivers to acquire recent nutrition knowledge and apply them more effectively to care-recipients are needed.
하이브리드 제상 방식을 적용한 냉장고용 핀-관 열교환기의 제상 성능 평가
이수원(Suwon Lee),박용주(Yongjoo Park),권래언(Laeun Kweon),정영만(Youngman Jeong),이재근(Jaekeun Lee) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.1
The hybrid defrost process combined with hot-gas bypass defrost and electric heater defrost was experimentally evaluated about its defrost performance in the fin-tube evaporators of household refrigerators. Also the hybrid defrost process was compared with only electric heater defrost process. The defrost efficiency of the hybrid defrost process was shown two times higher than electric heater defrost process. The defrost time of the hybrid defrost process was shorten about 10%∼50% than electric heater defrost process. Thermal shock after defrost process was decreased about 50% for the case of the hybrid defrost. It was found that energy consumption ratio of defrost process was reduced up to 7.4% compared with 22.4% of electric heater defrost at the condition of 25℃ ambient temperature.