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김영진,오삼권,임기욱 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-
기업 내 관련 업무 및 조직의 유기적 연결을 통한 원활한 정보의 흐름은 생산성의 중대에 많은 영향을 주며 기업의 경쟁력과도 밀접한 관계가 있다.이러한 이유로 연구개발에서부터 설계, 제조, 판매에 이르기까지 컴퓨터와 통신기술을 활용하여 기업의 업무 흐름을 통합적으로 관리할 수 있는 컴퓨팅 시스템이 필요하다.그러나 기업 내 업무의 성격 및 규모, 어플리케이션 튜닝 등의 충분한 검토가 수행되지 않은 컴퓨팅 시스템은 개발비용의 부담과 더불어 시스템의 성능을 오히려 저하시킬 수 있다.본 논문은 생산 제조 업체의 업무의 성격과 환경에 적합하고 업무의 흐름을 유기적으로 통합 관리할 수 있는 클라이언트/서버 기반 생산 관리 시스템을 설계 및 구현하였다.
대퇴-대퇴동맥간 우회로술 후 하지 허혈증상 재발 및 이식편 폐색의 원인
김형기,김영욱,허승,나목찬 대한혈관외과학회 2002 Vascular Specialist International Vol.18 No.1
With increasing number of high-risk advanced atherosclerotic patients, crossover femoro-femoral pypass (FFB) became commonly chosen extra-anatomic bypass for symptomatic iliac artery occlusive disease. But the causes FFB graft failure have not been clarified yet. Purpose: We aimed to investigate the natural course of native artery disease, the causes of graft occlusion and recurrent leg ischemia after FFBs. Method: Among 162 primary FFBs for ??atherosclerotic iliac occlusive disease, 45 patients who underwent follow-up arteriography for recurrent ischemic symptom were enrolled. We investigated the interval changes between initial preoperative and follow-up angiograms and categorized then as inflow, outflow and/or graft lesion into stenosis >50% or occlusion. And the patients were divided into 2 groups as patent FFB group and occluded FFB group. We compared interval changes on angiograms between patient and occluded FFB groups to find out any difference and tried to determine the ultimate causes of recurrent leg ischemia considering not only the interval changes but the preexisting, untreated leg arterial lesions. Result: The follow-up angiography was most commonly performed within 1 year after FFV with mean interval of 21.2 ± 21.6 months. Interval changes between 2 angiograms were 24 (53.3%) FFB grafts occlusion, 8 (17.8%) inflow iliac disease progression, and 26 (57.8%) outflow arterial occlusion. Comparing the interval changes between patent and occluded FFB groups, the significantly higher frequency of outflow occlusion was noted in occluded FFB group (75% ??vs 38.1%, P=0.012). The most common finding on follow-up ??angiongram responsible for the recurrent ischemia was also outflowarterial occlusion even in patent FFB group. Conclusion: The most common cause of graft occlusion and recurrent leg ischemia was outflow arterial occlusion after FFB.
유기용제 노출에 따른 신발제조업체 근무 여성근로자들에서의 후천적 색각이상
변주현,이광영,김영기,고광욱,이용환 대한산업의학회 2001 대한직업환경의학회지 Vol.13 No.3
목적 : 복합유기용제에 노출되는 신발제조업체 근무 여성근로자들에서 유기용제 누적노출량과 후천성 색각이상 발현빈도간의 상관성을 조사하기 위해 본 연구를 실시하였다. 방법 : 신발제조업체 근무 여성근로자들 가운데 유기용제에 노출되는 85명과 유기용제에 노출되지 않는 근로자 88명을 대상으로 조사하였다. 조도가 표준화된 방에서 시력검사와 색각이상 검사를 실시하였다. 작업 부서를 접착, 사상 및 선처리 부서로 나누었고 작업 부서별로 현재노출량과 누적노출량을 구하였다. 결과 : 색각이상의 유병률은 노출군이 대조군보다 통계학적으로 유의하게 높았으며 (P=0.017). 유기용제 노출군 85명 가운데 후천적 색각이상인 청황색 색각이상자가 5명(5.9 %)이었다. 안증상도 노출군이 대조군보다 발생빈도가 높았으며 통계학적으로 유의한 차이를 보였다(P=0.001). 색 혼란지수에 영향을 줄 수 있는 변수들인 연령, 교육기간, 누적노출량 등은 유의한 변수로 나타나지 않았다. 결론 : 유기용제 노출군에서 색각이상의 유병률이 대조군보다 유의하게 높았으며, 특히 유기용제 노출군에서 후천적 색각이상인 청황색 색각이상도 발견되었다. 그러나 유기용제 누적노출량과 색 혼란지수와 유의한 연관성은 발견할 수 없었는데 이는 유기용제의 노출량이 너무 낮았으며, 근로자의 이직률 또한 놓아 누적노출량 계산을 위한 추적기간이 제한되었기 때문인 것으로 생각되며 앞으로 고농도 노출 근로자를 대상으로 연구를 하면 분명한 결과를 얻을 수 있을 것으로 기대된다. Objectives : This study was undertaken to investigate the relationship between color vision defects and occupational exposure to mixed organic solvents in women workers who were engaged in the shoe manufacturing industry. Methods : A total of 173 women workers were involved in this study, 85 of whom were exposed to mixed organic solvents and were defined as the exposed group, and 88 workers comprised the non-exposed control group. The patients were questioned as to their drinking history, the year in which they were exposed and whether they had eye symptoms of blureed vision, eye fatigue, and eye irritation. The exposed workers in the shoe manufacturing factory were engaged in 3 work areas which were pasting, trimming, and cleaning. Their Color vision was assessed using the Hahn's double 15 hue test under standard illumination and their current and cumulative exposure levels were measured. Results : The prevalence of color vision defect was 21.2% in the exposed group and 8.0% in the control group, and the blue-yellow defect was found to be 5.9% in the exposed group. The logistic regression for the acquired dyschromatopsia and color confusion index showed that there were no variables that had significant relationships. Eye symptoms were more frequently developed in the exposed group. Conclusions : There is a possibility of developing color vision defects when workers are exposed to mixed organic solvents. However, the results of the color confusion index showed that there was no significant relationship to the coumulative exposure level, because of the low exposure level and high occupational turn over rate of the workers. Because the workers in the present study were exposed to low level solvents it will be necessary to study workers exposed to higher levels of organic solvents.
Sound Analysis in an In Vitro Endotracheal Tube Model
( Young Sik Park ),( Young Wook Kee ),( Kwang Suk Park ),( Jin Woo Lee ),( Sang Min Lee ),( Jae Joon Yim ),( Chul Gyu Yoo ),( Young Whan Kim ),( Sung Koo Han ),( Seok Chul Yang1 ) 대한내과학회 2011 The Korean Journal of Internal Medicine Vol.26 No.4
Background/Aims: Complete endotracheal tube obstruction is a medical emergency, and partial occlusion causes increased breathing rates and failure to wean off mechanical ventilation. Partial occlusion may be underestimated due to the lack of proper detection methods. We tested whether the sound of an endotracheal tube could be used to detect an endotracheal tube obstruction using an in vitro model. Methods: An endotracheal tube was connected to a ventilator on one end and a test lung on the other. Sounds were recorded with a microphone located inside the endotracheal tube via a connector. During mechanical ventilation, we changed the endotracheal tube internal diameter from 5.0 to 8.0 mm and different grades of obstruction at different sites were used along the tube. Sound energy was compared among the different conditions. Results: The energy of endotracheal tube sounds was positively correlated with the internal diameter and negatively correlated with the degree of obstruction. The rate of decline in energy differed with obstruction location. When the obstruction was more distal, the rate of decline in endotracheal sound energy was more rapid. Conclusions: Changes in the sound of an endotracheal tube can be used to detect an obstruction. Further studies are needed for clinical application.