http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
다발성 외상으로 인한 심한 폐 좌상과 스트레스성 심근병 환자에서 체외막형 산화기의 치료 경험
이대상 ( Dae Sang Lee ),길은미 ( Eun Mi Gil ),이아란 ( A Lan Lee ),하태순 ( Tae Sun Ha ),정치량 ( Chi Ryang Chung ),박치민 ( Chi Min Park ),조양현 ( Yang Hyun Cho ) 대한외상학회 2014 大韓外傷學會誌 Vol.27 No.4
A 55 year-old man hit a vehicle while riding a bicycle. He was diagnosed as left hemopneumothorax, multiple rib fracture, cerebral hemorrhage, and skull fracture. Initially he suffered from hypoxia requiring 100% oxygen with a mechanical ventilator. Finally he became hypotensive. Venovenous extracorporeal membrane oxygenation (ECMO) was initiated to support patient’s gas exchange. Because hypotension and left ventricular dysfuction persisted, we converted the mode of support to veno-arterio-venous ECMO. Over four days of intensive care, we could wean off ECMO. The patient went to rehabilitation facility after 45 days of hospitalization. Although trauma and bleeding are considered as relative contraindication of ECMO, careful decision making and management may enable us to use ECMO for trauma-related refractory heart and/or lung failure. [ J Trauma Inj 2014; 27: 229-32 ]
입자추적법을 이용한 소규모 하천 및 해역으로의 부유사 확산 예측
탁대호 ( Dae-ho Tac ),이대인 ( Dae-in Lee ),서정범 ( Jung-bum Seo ),이돈길 ( Don-gil Lee ),정병길 ( Byung-gil Jung ) 한국환경기술학회 2015 한국환경기술학회지 Vol.16 No.5
본 연구는 급경사 및 사행이 심한 소규모 하천에서의 부유토사 확산예측을 입자추적자방법으로 예측하였다. 입자추적자 방법을 적용하기 위해서는 특별한 시나리오가 필요하다. 시나리오는 첫째 강우유출해석(SWMM), 둘째 하천수면형계산(HEC-RAS), 셋째 2차원 하천흐름해석(DIVAST), 마지막으로 입자추적모형을 이용한 부유토사확산 예측으로 구성하였다. 2014년 8월에 발생한 집중호우자료를 분석하여 부유토사확산을 예측한 결과, 하구의 조사정점에서 27%의 오차가 나타났으나, 이런 오차는 조사정점이 하천경사가 급변하고 단면이 급확대 되어 유속이 감소하는 현상에 대한 예측이 가지는 한계일 것으로 판단된다. 또한 하류에서는 유속이 감소되어 방류입자들이 외해로 나가지 못하고 하류에서 정체되는 것으로 나타났다. 본 연구에서 수행한 결과는 향후 소규모 급경사 하천에서의 수질변화 모의의 기본적인 방법으로 적용이 가능할 것이다. This research was performed to simulations of the diffusion of suspended sediment in a steep slope and meandering small river. In order to predict it, the scenario was summarized as following steps: 1. The analysis of rainfall runoff for the study area using SWMM. 2. Computing the water surface using HEC-RAS. 3. Computing the two-d imentional river flow using DIVAST. 4. The simulation of the suspended sediment using particle tracking method. The result of the simulation of suspended sediment was according to the rainfall in August. The result showed a good agrement with the diffusion pattern in this study area. Also the particles did not go out to offshore because the velocity was decreased by the change of bottom slope from steep to mild. The result of this study will be used for a small and steep river to simulate water quality widely.
이대인 ( Lee Dae In ),박청길 ( Park Cheong Gil ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.5
The objective of this paper is to estimate the reduction rate of pollutant loads from pollution sources using the three dimensional eco-hydrodynamic model for effective water quality management of Masan Bay that was designated as a special management area. COD distribution of the bay was mostly over 3㎎/L. this value exceeded the seawater quality criteria Ⅲ. Total loads of COD, DIN and DIP from point sources were 15.532.5, 11,107.6 and 440.9㎏/day. respectively. A pattern of simulated residual current was dominated by southward flow at surface level. The calculated results by ecological modeling were in fairly good agreement with the observed values. It was evaluated that reduction of total polutant loads from point sources by over 60% is required in order to keep the level below 3 ㎎/L in COD which is the aiming seawater quality criteria of Masan Bay.
방경근,이대길,Bang, Gyeong-Geun,Lee, Dae-Gil 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.11
For the stable operation of high speed air spindle, the low rotational inertia and high damping ratio of spindle shafts as well as high fundamental natural frequency are indispensable. Conventional steel spindles are net appropriate for very high speed operation because of their high rotational inertia and low damping ratio. In this study, a high speed spindle composed of carbon fiber epoxy composite shaft and steel flange was designed for maximum critical speed considering minimum static deflection and radial expansion due to bending load and centrifugal force during high speed relation. The stacking angle and the stacking thickness of the composite shaft and the adhesive bonding length of the 7teel flange were selected through vibrational analysis considering static and thermal loads due to temperature rise.
동시경화 강철-복합재료 원형 단일 겹치기 조인트의 최적설계
조덕현,이대길,Jo, Deok-Hyeon,Lee, Dae-Gil 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.5
In this paper, a failure model for co-cured steel-composite tubular single lap joints has been proposed incorporating the nonlinear mechanical behavior of steel adherends and different failure mode s such as steel adherend failure and composite adherend failure. The characteristics of the co-cured steel-composite tubular single lap joint were investigated with respect to the test temperature, the stacking sequence of composite adherend, the thickness ratio of steel adherend to composite adherend, and the scarf ratio of steel adherend. Thus, the optimum design method for the co-cured steel-composite tubular single lap joint was suggested.
비틀림 접착 조인트의 피로 수명에 대한 표면 조도와 접착 두께의 영향
권재욱,이대길,Gwon, Jae-Uk,Lee, Dae-Gil 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.8
Since the surface roughness of adherends affects much the strength of adhesivelybonded joints, the effect of surface roughness on the fatigue life of adhesively bonded tubular single lap joints was investigated analytically and experimentally by fatigue torsion test. The stiffness of the interfacial layer between adherends and adhesive was modeled as a normal statistical distribution function of surface roughness of adherends. From the investigation, it was found that the optimum surface roughness of adherends for the fatigue strength of tubular single lap joints was dependent on bondthickness and applied load.
오제훈,이대길,O, Je-Hun,Lee, Dae-Gil 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.11
During the curing process of thick glass/epoxy laminates, a substantial amount of temperature lag and overshoot at the center of the laminates is usually experienced due to the large thickness and low thermal conductivity of the glass/epoxy composites. Also, it takes a longer time for full and uniform consolidation. In this work, temperature, degree of cure and consolidation of a 20 mm thick unidirectional glass/epoxy laminate were investigated using an experiment and a 3-dimentional numerical analysis. From the experimental and numerical results, it was found that the experimentally obtained temperature profile agreed well with the numerical one, and the cure cycle recommended by the prepreg manufacturer should be modified to prevent a temperature overshoot and to obtain full consolidation.
동시경화법으로 제조된 복합재료 조인트의 강도 및 파괴모드 연구
최진호,이대길,Choi, Jin-Ho,Lee, Dae-Gil 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.3
The joint design and manufacture of the composite structure have become an important research area because the structural efficiency of the composite structure is often determined by its joint not by its basic structure. The co-cured joint is an efficient joint technique because both curing and jointing for composite structures are achieved simultaneously. In this paper, the torque capacities of the co-cured tubular lap joint with and without knurling of the pyamid type were experimentally measure. From the experimental resuts, it was found that the excess resin played a role as an adhesive in the co-cured tubular lap joint whose steel adherends were not knurled. Also, it was found that the torque capacity of the co-cured joint was increased as the knurling size of the pyramid type on the surface of the steel adherend was increased.