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흙다짐 건축재료의 적정함수비 현장확인을 위한 낙하시험 방법의 실험적 개선
이종국 한국건축시공학회 2015 한국건축시공학회지 Vol.15 No.1
Although the interest for earth architecture has been expanded and settled as a part of modern architecture, preciselycalculating the ratio of water content in practice is still difficult and the calculation is based on empirical analysis yet. This causes many problems in durability and maintenance of earthen architecture. Therefore, this study investigated tofind the easiest way to correctly calculate the appropriate level of water content ratio (AWCR), which can be used inpractice. Until now, the workers have checked the AWCR based on their own experience with popular but vaguemanuals. On this awareness, we studied the several testing methods and found the dropping test which uses the patternof shape after the sample is dropped. In this point, we studied and developed the definite testing method in terms ofprocess, and shape discrimination. Also we suggest the test recording sheet by using the cobalt chloride(CoCl2) whosecolor is instantly changed when contacts with the moisture. It is believed that this result can help improving the qualityand durability of the earthen architecture using the rammed earth method and the efficiency in practice. 본 연구는 흙건축 시공 시 많이 사용되는 흙다짐 공법의경우, 흙재료의 배합 숙련도에 따라 달라지는 함수량은 강도와 내구성에 크게 영향을 미치게 되므로 이를 적절히 확인하여 시공하는 것은 매우 중요하다. 적정함수량의 산정문제는 실험실 환경에서는 정확하게 구할 수 있지만 현장에서는 여러 여건상 곤란한 것이 현실이다. 따라서 본 연구는 흙건축에 적용되는 흙다짐 공법을 중심으로 낙하시험과 함수율의 관계를 규명하여 실제현장에서 작업자가 쉽게 적정함수비를 판별할 수 있는 용이성과시험의 정확성 문제를 개선하고자 한다. 실험의 결과를 통하여 현장에서 활용할 수 있는 배합설계와 시험방법의 명세화, 낙하형상 판별방법의 과정과 결과를 제시하였다.
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이종국,서재성,Lee, Jong-Guk,Seo, Jae-Seong 대한흉부심장혈관외과학회 1994 Journal of Chest Surgery Vol.27 No.9
We have modified the isolated perfused working rabbit lung model [IPWL] by perfusing the isolated lung with a hollow fiber membrane deoxygenator.For assessment the stored lung was ventilated with FIO2 0.4 and perfused with 37$^{\circ}$C deoxygenated circulating blood at a rate 5ml/kg/min for several hours until lung failure.We chose to compare our developing solution which contained low potassium and pentastarch with the modified Euro-Collins solution .Experiments were divided into four groups[n=6] based on the type of flushing preservation solution and preservation time.The flushed lungs were then preserved into same solution at 8~10$^{\circ}$C with 100% O2 inflated condition for 1 or 20 hours.These following results were obtained.The IPWL model requires only one animal per experiment and allows for the continuous assessment of aerodynamic performance. This should therefore be used as screening test in lung preservation.One hour preservation groups, there were no significant difference in recovery rates of PaO2, PAP and Paw. Survival time in the one hour preservation groups were very significant long in the Group II[LPPS, p<0.01]. Twenty hours preservation groups, there were no significant difference in the recovery rates of PAP and Paw between Group III[m-ECS] and Group IV[NS], but PaO2 was significantly worse at onset of reperfusion in Group III when compared with Group IV [p<0.05]. And also survival time in the 20 hours preservation groups were significant long in the Group IV [p<0.05].
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만성 폐전색증의 폐동맥 색전제거및 내막 절제술;치험 2례
이종국,윤치순,김은기,Lee, Jong-Guk,Yun, Chi-Sun,Kim, Eun-Gi 대한흉부심장혈관외과학회 1991 Journal of Chest Surgery Vol.24 No.12
Two successful pulmonary thromboendartectomies were performed. In the first case, it was performed under cardiopulmonary bypass with moderate hypothermia and ventricular fibrillation In the second case, it was done under deep hypothermia and intermittent circulatory arrest. The patients are recovered uneventfully without complication and discharged from the hospital on warfarin. Their symptoms were improved and the follow-up pulmonary perfusion scans revealed no evidence of residual pulmonary embolus in both cases.
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