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권우철(Woo Chul Kwon),윤준용(Joon-yong Yoon),이병휘(Byeong-Huee Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Distribution manifolds for room heating systems are used to optimally distribute the heating fluid in ondol(Korean underfloor heating system) circuits for each room heating separately in a house whose heating systems are district , central or individual heating systems. Recently, the energy saving is one of hot issues in industrial and engineering fields, so distribution manifolds for room heating systems are developed to improve the heating efficiency and save heating cost. In this study, Items and methods of distribution manifolds for performance evaluation of room heating systems are researched. For performance evaluations, flow rate distribution accuracy test, hydraulic characteristics per flow rate control valve’s indicat or and noise tests are researched.
Joon-yong Yoon(윤준용),Woo Chul Kwon(권우철),Youn-hwan Kim(김윤환) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
In this paper, the aerodynamic characteristics of a helicopter rotor in hover were compared based on a variety of inflow conditions using Blade Element Momentum Theory (BEMT). BEMT has been widely used as an aerodynamic analysis method for helicopter rotors because of its simpler code and shorter calculating time than computational fluid dynamics (CFD) analysis. In order to verify the validity of inflow models, we applied the conventional inflow conditions and Madsen's inflow condition to the helicopter rotor in hover. The results were compared with Caradonna and Tung's data.
증례 : 호흡기 ; 이물질 흡인과 관련된 기관지 방선균증 1예
노진규 ( Jin Kyu Noh ),정순희 ( Soon Hee Jung ),권우철 ( Woo Cheol Kwon ),이민수 ( Min Su Lee ),리원연 ( Won Yeon Lee ),신계철 ( Kye Chul Shin ),용석중 ( Suk Joong Yong ) 대한내과학회 2009 대한내과학회지 Vol.77 No.5S
기관지 방선균증은 드문 경우로 면역기능이 저하되거나 구강위생이 좋지 않은 경우 발생할 수 있다. 만성적인 경과를 보이기 때문에 진단이 늦어지고 폐암으로 오인되기도 한다. 원발성 기관지 방선균증은 매우 드문 사례로 기관지 방선균증이 의심될 때는 악성종양과 이물질 흡인을 고려하여야 한다. 본 증례는 기관지내시경을 시행하여 생선뼈로 판단되는 이물질과 육아조직을 제거하였으며 기관지세척을 통한 세포학적 검사에서 sulfur granule을 확인하여 기관지 방선균증을 진단하였다. Actinomycosis is a chronic suppurative infection that infiltrates mucosa associated tissues. Primary endobronchial actinomycosis is rare and very uncommon in association with a foreign body aspiration. We diagnosed endobronchial actinomycosis associated with a fish bone aspiration. The patient was a 55-year-old male with no history of hypertension, diabetes, or pulmonary tuberculosis. About 5 years ago, he had an episode of choking while eating fish, and had suffered a chronic cough and sputum since that episode. The patient underwent a fiberoptic bronchoscopy, and granulation tissue and foreign bodies were noted in the right lower bronchus. We diagnosed actinomycosis by the presence of sulfur granules in the bronchial wash cytology. We removed the foreign bodies, which were identified as fish bones, by rigid bronchoscopy. The patient was treated with intravenous antibiotics for 1 week and oral antibiotics for 5 weeks, and his symptoms resolved. Serial fiberoptic bronchoscopy documented a gradual resolution of the granulation tissue and inflammation. (Korean J Med 77:S1178-S1182, 2009)
이달의 X-선 : 중심정맥카테터 삽입의 이상위치로 발생한 편측성 흉수 1례
김재석 ( Jae Seok Kim ),김상하 ( Sang Ha Kim ),이낙원 ( Nak Won Lee ),권우철 ( Woo Cheol Kwon ),최훈 ( Hun Choi ),변종원 ( Jong Won Beon ),홍태원 ( Tae Won Hong ),신계철 ( Kye Chul Shin ),용석중 ( Suk Joong Yong ) 대한결핵 및 호흡기학회 2006 Tuberculosis and Respiratory Diseases Vol.60 No.6
중심정맥카테터 삽입 후 생길 수 있는 드문 합병증 중에 하나인 흉수 발생은 카테터와 관련된 혈관벽의 손상을 흉수 발생의 기전으로 설명하고 있다. 저자들은 우측 쇄골하정맥으로 이어지는 이상혈관 내로 카테터가 위치한 후 혈관 파열로 인하여 발생한 흉수 1례를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Central venous catheterization is used to provide a large amount of fluid, total parenteral nutrition and to administer antitumor agents with few complications reported. We report an uncommon case of pleural effusion that occurred after central venous catheterization. In many cases, the mechanism for the pleural effusion after central venous catheterization occurs through an injury to the superior vena cava by the continuous mechanical force of the catheter tip, the flow of large amount of fluid and an osmotic injury to the wall of the vein. This case is somewhat different in that the central catheter was placed in an aberrant vessel resulting in the pleural effusion. A post-placement chest roentgenogram and the correct approach of catheterization are important for preventing this complication. (Tuberc Respir Dis 2006; 60: 690-693)