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이민우,배재성,이수용,이석준,전부일,Lee, Min-Woo,Bae, Jae-Sung,Lee, Soo-Yong,Lee, Seok-Joon,Jeon, Boo-Il 항공우주시스템공학회 2008 항공우주시스템공학회지 Vol.2 No.1
The three-dimensional finite element modeling of a composite rotor blade is very hard and requires much computation effort. The efficient method to model a composite beam is necessary for the dynamic and aeroelastic analyses of rotor blades. In this study, the beam modeling method of a composite rotor blade is studied using VABS. The computer program, VABS (Variational Asymptotic Beam Section Analysis), uses the variational asymptotic method to split a 3-D nonlinear elasticity problem into 2-D cross-sectional analysis and 1-D nonlinear beam problem. The VABS can produce the sectional stiffness coefficients of composite rotor blades with various cross section and initial twist/curvatures, and recover the original 3-D distribution of displacement/strain/stress fields. The results of various cross section beams show that VABS gives us the accurate results comparared to commercial codes and does not need much computation effort. It can be concluded that VABS provides the efficient method to establish the FE model of a composite rotor blade.
과루지실탕(瓜蔞枳實湯)이 흡연(吸煙)으로 인(因)한 만성호흡기질환(慢性呼吸器疾患)의 임상적(臨床的) 고찰(考察)
이민우,박동일,Lee, Min-Woo,Park, Dong-I 대한한방내과학회 1998 大韓韓方內科學會誌 Vol.19 No.1
This study involved 45 man-smoker outpatients of Han-lim oriental medical hospital from Feb. 1, 1998 to May 31, 1998. The results of this study are as follows ; 1. In sex distinction, the average age was 51.9 years with persons aged 25 to 83 years. 40's and 50's are the most as 12 persons (26.7%) respectively, and in order of the next 30's and 60's are 7 persons (15.55%) respectively, more than 71 years are 5 persons (11.10%), less than 30 years are 2 persons. 2. In occupational distinction, farmers are the most as 20 persons (44.4%), and then common desk workers are 11 persons (24.44%), fishermen are 8 persons (17.78%), the others are 6 persons (13.34%) in that order. 3. In the distinction of chief complaint, cough 39 persons (88.67 %), sputum 29 persons (64.44%), dyspnea 13 persons (28.89%), loss of appetite 7 persons (15,56%), chest pain 5 persons (11.11%) in that order 4. the effects after dosage are as follows ; favorable turn of sputum is the most 89.66%, cough 64.10%, chest pain 60%, dypsnea 53.85%, loss of appetite 28.57%. As a whole, more than 68.32% was improved. As the above, it was thought that Kwarujisiltang administration was evidently effective on a chronic disease of the respiratory organs.
현삼(玄蔘)이 $SO_2$로 손상된 흰쥐의 호흡기 조직에 미치는 영향
이민우,전종철,박동일,Lee, Min-Woo,Jeon, Jong-Choul,Park, Dong-Il 대한한방내과학회 2000 大韓韓方內科學會誌 Vol.21 No.4
Objective : This experiment was performed in order to study the effects of Scrophulariae Radix on the injured tracheal tissue induced So, in rats. Methods : Healthy adult male rats weighting about 250g were divided into 4 groups - the Normal group, the Control group, the group of Scrophulariae Radix administration for 5 days after $SO_2$, gas exposure(Sample I), and the group of Scrophulariae Radix administration for 10 days before and for 5 days after $SO_2$, gas exposure(Sample II). Results : In the trachea Control group, the lesion of the ciliated epithelium was severe and the mucus secretion of the respiratory tract was increased significantly. In the trachea of Sample I group, the lesion of the ciliated epithelium and the mucus secretion of the respiratory tract were decreased compared with Control group. In the trachea of Sample II group, the lesion of the ciliated epithelium and the mucus secretion of the respiratory tract were decreased compared with Control and Sample I group. conclusions : According to the above results, Scrophulariae Radix has significant effects on the injuried tracheal tissue caused by $SO_2$ in rats.
장기폭로 시험과 철근 부식 촉진시험의 시간적 상관성에 관한 연구
이민우,박상순,Lee, Min-Woo,Park, Sang-Soon 한국건설순환자원학회 2014 한국건설순환자원학회 논문집 Vol.2 No.4
부식촉진시험의 가장 확실하고 신뢰성이 높은 방법은 해양폭로 시험장에 직접 폭로시켜 철근부식모니터링을 실시하는 방법이지만 장기간이 소요되는 단점이 있다. 그래서 이를 대체하는 수단으로 많은 연구들이 진행되어 왔다. 하지만 부식촉진시험이 폭로환경의 어느 정도 기간에 상응하느냐는 상관성에 대한 규정은 정해져 있지 않은 상황이다. 본 논문에서는 간만대, 침지내 환경을 재현한 철근부식촉진시험과 장기폭로시험을 실시하였다. 환경조건을 변수로 시험을 실시하였으며, 반전지전위법을 통한 철근부식 모니터링을 실시하였다. 부식촉진 시험결과 시험조건 별 상대부식개시시점 도출을 할 수 있었으며, 내구성 해석 프로그램인 Life365와 염화물적정시험을 통해 염화물침투해석을 실시하였다. Recent interest in the increased structural performance and durability evaluation of this concrete structure in a salt damage environment is increasing. The most secure and reliable method of accelerated corrosion test is a method to carry out the rebar corrosion monitoring can be exposed directly to the marine test site exposure. However, long-term exposure testinghas the disadvantage that a long period is necessary. So, a lot of research on RC of salt damage environment have beenpromoted as alternatives to replace this. However, accelerated corrosion test, in the short term only is appropriate and is but an accelerated test method to evaluate the critical chlorine concentration, there is a difficult problem that you still get the answer. It is one of the correlation problems accelerated test correspond to a certain period of exposure environment. Therefore, in this study, to clarify the differences rebar corrosion beginning, through the actual corrosion accelerated test in corrosion time and laboratory test chamber of the structure of the marine environment results in both environments, it is an object of correlation coefficient derived.
입계확산처리된 Nd-Fe-B 소결자석에서 Dy의 확산에 미치는 Cu와 Al 분말의 혼합 효과
이민우,장태석,Lee, Min Woo,Jang, Tae Suk 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.6
We investigate the microstructural and magnetic property changes of $DyH_2$, $Cu+DyH_2$, and $Al+DyH_2$ diffusion-treated NdFeB sintered magnets with the post annealing (PA) temperature. The coercivity of all the diffusion-treated magnets increases with increasing heat treatment temperature except at $910^{\circ}C$, where it decreases slightly. Moreover, at $880^{\circ}C$, the coercivity increases by 3.8 kOe in Cu and 4.7 kOe in Al-mixed $DyH_2$-coated magnets, whereas this increase is relatively low (3.0 kOe) in the magnet coated with only $DyH_2$. Both Cu and Al have an almost similar effect on the coercivity improvement, particularly over the heat treatment temperature range of $790-880^{\circ}C$. The diffusivity and diffusion depth of Dy increases in those magnets that are treated with Cu or Al-mixed $DyH_2$, mainly because of the comparatively easy diffusion path provided by Cu and Al owing to their solubility in the Nd-rich grain boundary phase. The formation of a highly anisotropic $(Nd,\;Dy)_2Fe_{14}B$ phase layer, which acts as the shell in the core-shell-type structure so as to prevent the reverse domain movement, is the cause of enhanced coercivity of diffusion-treated Nd-Fe-B magnets.
이민우,Lee, Min-U 한국건강관리협회 2010 건강소식 Vol.34 No.1
겨울철, 집안 분위기를 아늑하고 따뜻하게 바꿀 수 있는 방법은 없을까? 그동안 어둠을 밝히는 전기 기기로만 생각했던 조명을 이용하면 실내 분위기를 한껏 살릴 수 있다. 거주자의 라이프스타일과 인테리어적인 감각 그리고 눈의 건강을 고려한 탁월한 조명연출법을 살펴보자.
건.찾.사(건강을 찾는 사람들) - 마음으로 세상을 바라보는 사람들, 한국건강관리협회 문화예술 동호회 '마실'
이민우,Lee, Min-U 한국건강관리협회 2010 건강소식 Vol.34 No.1
직장 내 동호회라 하면 으레 축구나 야구, 등산과 같은 스포츠 관련 동호회가 떠오른다. 하지만 한국건강관리협회 서울 서부지부의 '마실'은 문화예술 관람을 목적으로 활동하는 정서적인 친목 동호회이다. 정적이지만 동적인 스포츠 동호회보다 유대가 더 돈독한 마실의 힘. 이는 마음으로 세상을 바라보는 순수한 마음을 가진 사람들이 있기 때문이다.