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오도연 ( Do Yeun Oh ) 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.2(S)
Patients with chronic liver disease frequently show hemostatic abnormalities with complex mechanism. Patients with chronic liver disease may be in hemostatic rebalance by concomitant changes in prohemostatic and antihemostatic pathways. Because the rebalanced hemostatic conditions in patients with chronic liver disease can be only detected by sophisticated tests, results from current routine laboratory tests do not well correlated with clinical findings in patients with chronic liver disease. More studies are required for proper management of hemostatic abnormalities in patients with chronic liver disease.
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오도한,안남현 해양환경안전학회 2019 海洋環境安全學會誌 Vol.25 No.7
Submarines, which have been called an invisible force, are strategic underwater weapon systems that perform missions such as anti-surface warfare, anti-submarine warfare, and high payoff target strikes with the advantage of underwater covertness. A submarine should be able to withstand the hydrostatic pressure of the deep sea. In this respect, the submarine pressure hull, as the main structural system to resist the external pressure corresponding to the submerged depth, should ensure the survivability from hazards and threats such as leakage, fires, shock, explosion, etc. To do this, the initial scantling of the submarine pressure hull must be calculated appropriately in the concept design phase. The shape of the aft transition ring varies according to its connection with the submarine aft end conical structure, pressure hull cylindrical part, and non-pressure hull of the submarine; the design of the aft transition ring should not only take into account stress flow and connectivity but also the cost increase due to the increased man-hours of its complex geometry. Therefore, trade-off studies based on the four different shapes of the aft transition ring are carried out considering both the review of the structural strength through nonlinear finite element analysis (FEA) and economic feasibility by reviewing the estimations of the manufacturing working days and material costs. Finally, the most rational structural aft transition ring shape for a submarine amongst four reviewed types was proposed. 보이지 않는 힘으로도 불리는 잠수함은 수중에서 활동하는 은밀성을 장점으로 대함전, 대잠전 및 핵심표적 타격 등의 임무를 수행하는 전략 수중 무기 체계로 심해에서 높은 수압을 견디며 작전을 수행할 수 있어야 한다. 이러한 관점에서 잠수함 압력 선체는 잠항 깊이에 상응하는 외부 수압에 저항하는 가장 중요한 체계로서 누수, 화재, 충격 및 폭발과 같은 위험으로부터 안전성을 확보함으로써 생존성을 높임과 동시에, 작전 수행 능력을 유지할 수 있게 해주는 강도를 확보하고 있어야 한다. 이를 위해서는 잠수함 압력 선체의 구조 형상 설계가 초기에 수행되는 것이 합리적이다. 특히, 함미 원추부 구조물과 압력선체 평형부 및 함미 비압력선체를 연결하는 함미 트랜지션 링의 경우, 설계된 잠수함에 따라 다양한 형상을 띄고 있다. 본 구조물 설계를 위해서는 응력 흐름과 연결성을 고려한 설계뿐만 아니라 복잡한 형상이 기인한 구조물 제작 투입 시수 증가로 인한 원가 상승 또한 검토해야 한다. 따라서, 본 연구에서는 4가지 서로 다른 형상을 갖는 함미 트랜지션 링에 대해서 비선형 유한요소해석을 통한 구조 강도 검토와 더불어 함미 트랜지션 링 형상 복잡도에 따른 작업 일수 및 자재비 검토를 통해 경제성 측면에서의 적정성 검토를 수행하였으며, 검토된 4가지 형상 중 가장 합리적인 잠수함 함미 트랜지션 링 형상을 제안하였다.
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Stability Analysis of Descriptor System Using Generalized Lyapunov Equation
오도창(Do-Chang Oh),이동기(Dong-Gi Lee) 대한전자공학회 2009 電子工學會論文誌-SC (System and control) Vol.46 No.4
이 논문에서는 특별한 형태의 일반화된 연속시간 Lyapunov 방정식과 해의 존재성에 대해 다룬다. 이것은 무한대의 고유치를 가지는 descriptor 시스템에 대해 시스템의 안정성을 분석하기 위해 필요하다. 주요결과로써 먼저 지수 1과 2를 가지는 경우의 descriptor시스템에 대해 안정성을 위한 필요충분조건을 먼저 제안하고 다음으로 일반적인 경우의 descriptor 시스템에 대하여 특별한 형태의 Lyapunov 방정식을 이용하여 비슷한 안정성 조건을 제안한다. 마지막으로 제안한 방법의 타당성을 보이기 위한 예제를 살펴본다. In this paper we consider the specific types of the generalized continuous-time Lyapunov equation and the existence of solution. This is motivated to analyze the system stability in situations where descriptor system has infinite eigenvalue. As main results, firstly the necessary and sufficient condition for stability of the descriptor system with index one or two will be proposed. Secondly, for the general case of any index, the similar condition for stability of descriptor system will be proposed with the specific type of the generalized Lyapunov equation. Finally some examples are used to show the validity of proposed methods.
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오도석,진은미,이진숙 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
Texture is a sense which is perceived by the character of materials and is one of important elements constituting building. Hut there is no concrete and systematic study on texture because of its complexity of elements which involved the physical property of the surface of substance. Accordingly, the purpose of this study is to grasp the influence of color on texture by average size of particle which is one of physical properties constituting texture. The study is proceeded as total two step. The content is as follows. 1) experiment of evaluation for the influence of color on texture 2) the analysis of influence of color on the evaluation of texture. The result is as follows. 1) According to the result of analysis by average SD score, all four adjectives were more influenced by the average size of particle of texture than color. The influence of color was not appeared. 2) According to the analysis of the average size of particle it is affecting over 60% with comparatively high among all evaluation vocabularies. 3) The influence of color represented relatively low affectivity under 40%.
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GCOTC에 의한 알코올류 분리를 위한 시스템 적합성에 관한 연구
오도석 ( Oh Doe Seok ),김성화 ( Kim Sung Hwa ),이슬 ( Lee Seul ),최재구 ( Choi Jae Gu ) 한국산업보건학회 (구 한국산업위생학회) 2017 한국산업보건학회지 Vol.27 No.2
Objectives: The purpose of this study is to enhance the application of analytical method of polar solvents(alcohols) by GCOTC (gas chromatography open tubular column) through the system suitability test(SST) to estimate the whole chromatographic system performance(integral part). Methods: To perform the SST, carried out repeatability(n=6) as analytical method of polar solvents by GCOTC, got the retention time(t<sub>R</sub>), standard deviation(σ<sub>n-1</sub>) of t<sub>R</sub>, baseline width(w<sub>b</sub>=4σ<sub>n-1</sub>) and calculated dead time(t<sub>m</sub>) by v<sub>m</sub>=d<sup>2</sup>πL(f/4) and v<sub>m</sub>=t<sub>m</sub> x flow rate. Results: In this experiment, obtained the basic data, there were t<sub>m</sub>=2 min, methanol(t<sub>R</sub>=3.569, σ<sub>n-1</sub>=0.01, w<sub>b</sub>=0.04), ethanol (t<sub>R</sub>=3.892, σ<sub>n-1</sub>=0.004, w<sub>b</sub>=0.016), isopropanol(t<sub>R</sub>=4.209, σ<sub>n-1</sub>=0.004, w<sub>b</sub>=0.016). By using these data, calculated the corrected retention time(t<sub>R</sub>`), capacity factor(k), separation factor(α), number of theoretical plate(n) and resolution(R<sub>s</sub>) for SST and got the good results. Conclusions: Through the SST, could reconfirm the whole chromatographic performance system(integral part) for analytical method of polar solvents by GCOTC. Therefore, this analytical method expect to be widely applied at the related areas.
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