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단일 및 이중 파형 실린더 주위 열 유동장의 대형 와 모사
오경진(Kyung Jin Oh),윤현식(Hyun Sik Yoon) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The present study investigates three-dimensional fluid flow and heat transfer around the single and double wavy cylinders at a Reynolds number of 3000 and Prandtl number of 0.7 by using large eddy simulation (LES). The spanwise wavelengths (λ/ D<SUB>m</SUB>) for the single and double wavy cylinders are 6.06. The wave amplitude (a/ D<SUB>m</SUB>) is fixed as the value of 0.152. For the purpose of the comparison, the smooth cylinder is also considered. The time averaged drag and fluctuating lift for the double wavy cylinder showed about 16% and 97% reduction, respectively compared to those for the smooth cylinder. Total surface-averaged Nusselt number for a smooth cylinder is larger than that of the single and double wavy cylinders. However, the local Nusselt number along the spanwise is strongly dependent on the spanwise geometric disturbance. The flow structures and isotherms distributions are analyzed to confirm the dependence of force and heat transfer coefficients on the wavy shape.
오경진 ( Kyung Jin Oh ),이기병 ( Ki Byung Lee ),홍순원 ( Soon Won Hong ),정교태 ( Kyo Tae Jung ),최홍규 ( Hong Kyu Choi ),김형중 ( Hyung Jung Kim ),안철민 ( Chul Min Ahn ),장윤수 ( Yoon Soo Chang ) 대한결핵 및 호흡기학회 2009 Tuberculosis and Respiratory Diseases Vol.67 No.5
Malignant rhabdoid tumors arise primarily from the kidney. Extrarenal malignant rhabdoid tumors are rare, with the liver, central nervous system, and skin reported as the primary sites. Malignant rhabdoid tumors of the mediastinum are extremely rare among extrarenal malignant rhadoid tumors; only 3 cases have been reported to date, all characterized by aggressive clinical behavior. We experienced a 35-year-old woman diagnosed with malignant rhabdoid tumor in the anterior mediastinum with multiple metastases. The tumor was surgically unresectable, and treated with palliative radiation therapy. Three-month after radiation treatment, she died from dissemination of the malignant rabdoid tumor.
김선 ( Sun Kim ),오경진 ( Kyung Jin Oh ),김정희 ( Jeong Hee Kim ),선용한 ( Young Han Sun ),임대현 ( Dae Hyun Lim ) 대한천식알레르기학회(구 대한알레르기학회) 2018 Allergy Asthma & Respiratory Disease Vol.6 No.6
Purpose: Foreign body aspiration in children is emergent and can cause serious complications. This study aims to show the clinical characteristics of foreign body aspiration and to analyze the clinical cases of delayed diagnosis to predict and prevent complications. Methods: We retrospectively reviewed the medical records of 63 children (48 in Inha University Hospital and 15 in Gachon University Gil Medical Center) who were diagnosed with foreign body aspiration through bronchoscopy from 1996 to 2017 in Incheon City, and analyzed clinical characteristics. Patients were divided into 3 groups: those were diagnosed within 24 hours, delayed after 24 hours, or delayed more than 7 days according to time elapse from the time of foreign body aspiration, and clinical characteristics of each group were compared. Results: Aspiration occurred in 58.7% at 1 year and 15.9% at 2 years. Cough (65.1%) and coarse breathing sound (41.3%) were most common, and radiologic findings were commonly presented as emphysema on the affected side (41.3%). Nuts were most common (42.9%), and there was no difference in the frequency between the right and left main bronchi. The documented history of foreign body aspiration was more frequently found in the early diagnosed group; however, sputum, fever, and complications were more frequent in the delayed diagnosed group. Conclusion: If a patient with respiratory disease has persistent fever or sputum, foreign body aspiration should be suspected. (Allergy Asthma Respir Dis 2018;6:303-309)