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나선형의 표면돌출물이 부착된 원주의 근접후류에 관한 실험적 연구
권기정,김형범,Gwon, Gi-Jeong,Kim, Hyeong-Beom 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.8
Surface protrusions have been attached on a cylinder surface to reduce the flow-induced structural vibration by controlling the wake flow. Wind tunnel tests on the near wake of a circular cylinder with surface protrusions were carried out to investigate the flow characteristics of the controlled wake. Three experimental models were used in this experiment; one plain cylinder of diameter D and two cylinders wrapped helically by three small wires of diameter d=0.075D with pitches of 5D and 10D, respectively. Free stream velocity was ranged to have Reynolds number from 5000 to 50,000. Streamwise and vertical velocity components of the wake were measured by a hot-wire anemometry. The spanwise velocity component measured by a one-component fiber optic LDV revealed that time-averaged wake field has a nearly two-dimensional structure. It was found that the surface protrusions elongate the vortex formation region, which decrease the vortex shedding frequency. The suppression of vortices caused by the surface protrusions increases the velocity deficit in the center of wake region.
폐결핵의 외과적 요법에 대한 임상적 고찰: 3,566예의 분석
권기정,김응수,권태원,Gwon, Gi-Jeong,Kim, Eung-Su,Gwon, Tae-Won 대한흉부심장혈관외과학회 1992 Journal of Chest Surgery (J Chest Surg) Vol.25 No.5
Between October 1964 and August 1979, 2,537 patients underwent operation for pulmonary disease including tuberculosis at the National Kongju Hospital. Ages at operation ranged from 6.6 to 67.6 years with a mean age of 30.8 years and the male to female ratio was 3.07: l. Indications for operation were, respectively, as follows; destroyed lobe or segment with /without cavity[68.6%], ipsilateral total destroyed lung[14.8%], empyema with/wit-hout fistula[6.0%], atelectasis with bronchostenosis[2.6%], bronchiectasis[2.4%], tuberculoma[1.6%], lung abscess[1.7%], etc. There were 1,416 thoracoplasties[most common], 915 lobectomies, 591 pneumonectomies, etc. 1,073 patients with hemoptysis were found, streaking[23.8%], mild[42.3%], moderate[26.6%], severe[3.4%] and massive[3.9%] as the severity. Tuberculosis was the most common cause of severe and massive hem-optysis. Postoperative complications were developed 16.% of the operated cases, bleeding was the most frequent complication found in these cases. The mortality of operation was 8%, the most common cause of death was bleeding also.