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김우람,장학,박상훈,고경석 대한성형외과학회 2005 Archives of Plastic Surgery Vol.32 No.2
Defect on the temporal area caused by, surgical ablation of a tumor or an infection should be reconstructed immediately to prevent potentially life-threatening complications such as meningitis and cerebrospinal fluid leakage. The defect on the temporal area usually presents as a typical 'cone-shape'. Successful reconstruction requires sufficient volume of well-vascularized soft tissue to cover the exposed bone and dura. From 1994 through 2003, the authors applied rectus abdominis free flap for the reconstruction of the temporal defect from 1994 through 2003. There were 10 patients with a mean age of 52.1 years. Of these 10 patients, external auditory canal cancer was present in four patients, temporal bone cancer in two, parotid gland cancer in one and three patients were reconstructed after debridement of infection(destructive chronic otitis media). All the free flaps survived, and flap-related complications did not occur. Compared to a local flap, the rectus abdominis free flap can provide sufficient volume of well-vascularized tissue to cover the large defect and can be well-tolerated during an adjuvant radiation therapy. The long and flat muscle can be easily molded to fit in to the 'cone-shape' temporal defect without dead space. It is also preferred because of the low donor site morbidity, a large skin island and an excellent vascular pedicle. Two-team approach without position change is possible. In conclusion, the authors think that rectus abdominis free flap should be considered as one of the most useful method for the reconstruction of a cone-shaped temporal defect.
Extraction of valuable inorganic salts from waste scrubbing liquid of de-SOx/de-NOx
김우람,이헌석,오수관,조영민 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
According to the IMO (international maritime organization) policy, every ship entering the Baltic has to equip the gas cleaning scrubber. Although various advanced de-SOx/de-NOx devices have been proposed, recovery of waste scrubbing liquid is of critical interests in a limited space of the ship. This waste solution contains many types of salts, this work attempts to recover some valuable materials before disposal. Some typical processes including thermal evaluation, low temperature extraction method and a selective organic solvent extraction method were experimentally evaluated. It primarily aims for extraction of ammonium sulfates and nitrates. Extraction yield was found 82.7% by heating evaporation. The obtained material was analyzed in its chemical and physical properties using TGA, FT-IR, EA and SEM-EDX.
비전통적 오차 최소화 방식에 기초한 비선형 빔의 휨에 대한 혼합형 유한요소해석 모델 연구
김우람,최윤대,Kim, Woo-Ram,Choi, Youn-Dae 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.6
In this paper, new type of finite element models for the analysis of nonlinear beam bending are developed by using unconventional residual minimizing method to increase accuracy of finite element solutions and overcome some of computational drawbacks. Developing procedures of the new models are presented along with the comparison of the numerical results of existing beam bending models.
1P-678 Preparation liquid propellants by dinitramide based oxidizers
김우람,박연수,권윤자,조영민 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
인공위성 자세 제어용으로서 적합한 비추력과 밀도 비추력을 갖춘 액상추진제를 고에너지산화제인 ADN[ammonium dinitramide], GDN[guanidine dinitramide], Py-DN[pyridinium dinitramide] 을 기반으로 각각 시험제조하였다. 추진제는 연료와 산화제, 용매와 상안정제 등을 혼합하여 제조하였고, 상안정성(DSC, freezing point), 밀도(ρ) 및 비추력(Isp)을 관찰하였다. 주 연료는 메탄올을 적용하되 에탄올과 혼합하여 발열량을 조절하였으며, 용매 내에서의 분산을 돕기 위하여 수산화아민을 비롯한 유기첨가물을 여러가지 비율로 첨가해보았다. 각 시료의 열분해 온도는 산화제 종류에 따라 168°C에서 182°C로 분포하였고, ADN 기반의 KHU-22 시료가 가장 높은 열분해 온도를 보여줌으로써 열안정성이 상대적으로 우수하다고 판단할 수 있었다. 각 시료의 비추력은 210 - 240 sec 로 나타났는 바, 기존의 상용 제품과 유사한 성능을 보유하고 있는 것으로 평가되었다. 한편, guanidine carbonate와 pyridine hydrochloride를 모체로 두 개의 질산기를 결합시킨 GDN과 Py-DN은 보조 추진제로서 액체연료의 발열량을 제어할 수 있는 조합으로의 개발여지가 충분하다.