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강대희,문덕영,유경선,현동훈 한국생산제조학회 2019 한국생산제조학회지 Vol.28 No.4
In this study, we fabricated polyurethane and epoxy lenses with a 135 W LED spotlight using a vacuum casting method. We implemented the lens shape and confirmed the illumination performance compared with that of existing lenses. First, we fabricated a silicone mold for the vacuum casting process with a 135 W LED light lens as a vacuum casting reference. Second, the lens material for the vacuum casting was fabricated using both polyurethane and epoxy materials; the performances of the polyurethane and the epoxy lenses manufactured by the vacuum mold were compared with that of other lenses. Finally, the NEMA type 4 H × 4 V lighting performance was studied.
3-way 초고압 밸브의 유로제어를 위한 니플 파단 특성에 관한 연구
강대희,란지,정윤재,김원태 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.6
The 3-way valve have been used as a valve for opening and closing the valve by the flow control in the pressure system of the cryogenic and high pressure environment. In this paper, numerical analysis and experimental study on fracture nipple of 3-way ultra high pressure valve applied to space launch vehicle was carried out. We have developed a 3-way valve numerical simulation modeler of cryogenic environment usingcommercial software ANSYS 18.2. As results of numerical analysis, optimum nipple condition was derived. In addition, a 3-way valve prototype was fabricated and the fracture test was performed and compared with the numerical analysis results.
Determinants of Poor Self-rated Health in Korean Adults With Diabetes
강대희,이휘원,Minkyo Song,Jae Jeong Yang 대한예방의학회 2015 Journal of Preventive Medicine and Public Health Vol.48 No.6
Objectives: Self-rated health is a measure of perceived health widely used in epidemiological studies. Our study investigated the determinants of poor self-rated health in middle-aged Korean adults with diabetes. Methods: A cross-sectional study was conducted based on the Health Examinees Study. A total of 9759 adults aged 40 to 69 years who reported having physician-diagnosed diabetes were analyzed with regard to a range of health determinants, including sociodemographic, lifestyle, psychosocial, and physical variables, in association with self-rated health status using multivariate logistic regression models. A p-value <0.05 was considered to indicate statistical significance. Results: We found that negative psychosocial conditions, including frequent stress events and severe distress according to the psychosocial well-being index, were most strongly associated with poor self-rated health (odds ratio [OR]Frequent stress events, 5.40; 95% confidence interval [CI], 4.63 to 6.29; ORSevere distress, 11.08; 95% CI, 8.77 to 14.00). Moreover, younger age and being underweight or obese were shown to be associated with poor self-rated health. Physical factors relating to participants’ medical history of diabetes, such as a younger age at diagnosis, a longer duration of diabetes, insulin therapy, hemoglobin A1c levels of 6.5% or more, and comorbidities, were other correlates of poor reported health. Conclusions: Our findings suggest that, in addition to medical variables, unfavorable socioeconomic factors, and adverse lifestyle behaviors, younger age, being underweight or obese, and psychosocial stress could be distinc factors in predicting negative perceived health status in Korean adults with diabetes.
강대희 가톨릭대학교 산업의학센터 2000 韓國의 産業醫學 Vol.39 No.4
The differences in disease occurrence varies from country to country. These might be either due to difference in genetic constituency in individuals from different ethnic backgrounds or to environmental factors including diet and personal habits, or more plausibly to the interactive effects of genetic and environmental factors. Post-gencomic era opens the potential application of functional genomics to the fields of occupational health. This mini-review of $quot;genetic effects in occupational diseases$quot; deals with several newly challenging areas of application of genetic information in occupational health Recent reports regarding the genetic susceptibility to occupational asthma, particularly DRB1 or DQB1 HLA class polymorphism give us interesting insights that the genetic information may play an important role in development of occupational asthma and this can be a good example of how genetic information provide us to better understanding for etiology of occupational diseases. Genetic testing for the employees who apply new jobs or genetic monitoring for the employees in certain hazardous environments also stimulate important issues of ethical, social, and economical problems among employees enforced to take the genetic testing. Finally, how genetic information can be used in delineating work-relatedness in compensating cases for occupational diseases was reviewed.
강대희,안윤옥,Kang, Dae-Hee,Ahn, Yoon-Ok 대한예방의학회 1988 Journal of Preventive Medicine and Public Health Vol.21 No.2
1. 회신율은 연구 주관기관이나 설문조사 내용, 표본의 성격, 응답자에게 주는 이익의 정도, 독촉 방법에 따라 많은 차이를 보이겠지만 본 사례에서 우편설문에 관한 응답양상을 살펴본 바, 회신율에 있어서는 1차 발송후 총 대상에 대하여 약 15-20% , 미응답 대상에 대한 2차 발송 후 2차 대상의 약 30%, 1, 2차 미응답 대상에 대한 3차 발송후 3차 대상의 약 20%정도의 회신율을 보여 총 회신율에 있어서는 약 54%정도를 보이었다. 이것은 사회과학 연구 조사에서의 회신율 10-25%에 비하여는 상당히 높다고 할 수 있고(김경동, 1986), 질문서 회신율이 50%면 분석의 목적 상 무난하다고 보아야 하고, 60%면 좋은 편이고, 70%가 넘으면 아주 훌륭하다는 Babbie(1973)의 의견에 비추어 볼 때 무응답 대상에 대한 비교연구가 수반되어야 정확한 판단을 내릴 수 있겠지만 본 사례에서의 회신율은 그런대로 만족할 수 있는 수준이라고 생각된다. 2. 미응답 대상에 대한 독촉 발송 시기에 있어서는 미응답 대상에 대하여 최초 발송 2주일 후 정도가 적절할 것으로 판단되며, 3차 발송까지 시행하는 것이 회신율을 높일 수 있는 방법으로 생각된다. 3차 발송 이후에도 응답이 없는 경우 또다시 독촉(4차 이상 발송)하여도 전체 회신율에는 크게 영향을 미치지 않을 것으로 예상된다. Christopher는 정부의 후원을 받는 조사 연구의 경우 회신율이 높다고 보고하였는데 이번 조사연구에서도 관련 부처로부터의 협조 공문이 회신율을 높이는데 기여하였다고 사료된다(Oppenheim, 1966).