연성판 부착에 의한 원주 후류제어 특성

문경록(K. R. Moon),도덕희(D.H. Doh),조효제(H.J. Jo),조경래(G.R. Cho),김병열(B.Y. Kim),황태규(T.G. Hwang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5

The wakes of a cylindrical body upon which a flexible plate has been attached have been investigated. The plate is made of silicon with configurations of 50㎜(W) × 150㎜(L) × 0.3㎜(T). The cylinder wakes have been tested with PIV experiments under the conditions with and without the flexible plate. The diameter of the installed cylinder body is 30㎜ and the Reynolds numbers are 2730, 6160 and 9750 wi th the diameter. The measurement system consists of an Ar-ion laser(6W), a high speed camera(1024 × 992 pixel, 500fps) and a host computer. FFT analyses have been carried out using the velocity vectors obtained by PIV measurements at the point X/D=1.52 and Z/D=0.52. It has been verified that the flexible plate suppresses or damps the vortices separated from the cylinder body, which makes the cylinder's wakes stable. With increase of Re numbers the intensity of the dominant frequency of the wakes become smaller.

식도질환의 외과적 수술에 대한 임상적 고찰

허용,이강식,이재진,김병열,이정호,유회성,Hur, Y.,Lee, K.S.,Lee, J.J,Kim, B.Y,Lee, J.H.,Yu, H.S. 대한흉부심장혈관외과학회 1988 Journal of Chest Surgery (J Chest Surg) Vol.21 No.6

Since Jan. 1957, 142 cases of benign esophageal stricture, 55 males and 87 females, were managed in our hospital, and their ages ranged from 3 to 77 years. old[mean 31.2yrs]. The most common cause was caustic burns and they all complained dysphagia and some loss of weight, general malaise and substernal pain, which usually appeared in 1 month to 1 year after ingestion of corrosive agents. The mid 1/3 of the thoracic esophagus was the most prevalent portion[29%] but rather evenly distributed along the entire esophagus. Operations were done on 129 patients, of whom 50 patients had ECG[esophagocologastrostomy], 5 PCG[pharyn-gocologastrostomy], 34 EG[esophagogastrostomy], 4 EJG[esophagojejunogastrostomy], 3 PG[pharyngogastrostomy], 2 esophageal end to end anastomosis and 31 Gastrostomy. There were 6 deaths in the postoperative period, so its operative mortality was 4.7%, among them 3 were ECG cases, 2 EG and 1 EJG. And 34 complications occurred so it recorded 24% complication rate. and in details in ECG 46%, PCG 60%, EG 17.6%, EJG 25%, and PG 33%. When we reviewed periodic variations, the mortality rate of the first 20 yrs. period was 6.9%, next 10yrs. 2.6% and now for last 2yrs non.

폐암의 임상적 고찰 (III)

허용,유환국,안욱수,김병열,이정호,유회성,Hur, Y.,Yu, H.K.,Ahn, W.S.,Kim, B.Y.,Lee, J.H.,Yu, H.S. 대한흉부심장혈관외과학회 1990 Journal of Chest Surgery (J Chest Surg) Vol.23 No.1

A total of 129 patients with a confirmed diagnosis of primary lung cancer were treated at Dep. of Thoracic k Cardiovascular Surgery, National Medical Center, Seoul, Korea, between July, 1981 and Dec., 1988. Particular emphasis was given in this review to the 72 patients that underwent surgical resection of their primary lung lesion. Factors such as histology, type of resection, sex, age, staging, and degree of dissemination were considered possible influences on survival. The age group of fifty k sixty decade occupied 55.8 %, and the youngest being 24 years and oldest 78 years. The incidence ratio of male to female was 3,2:1. The subjective symptoms of the patients were coughing [72.6%], chest pain [48.2%] and hemoptysis [35.6%], which were due to primary local influence. The confirmed diagnostic procedures were bronchoscopic biopsy, sputum cytology needle aspiration biopsy, open lung biopsy, anterior mediastinotomy & lymph node biopsy. By pathologic classifications, the squamous cell carcinoma was the most prevalent, 67 cases [51.9 %], and the adenocarcinoma in 36 cases [27.9%], undifferentiated small cell carcinoma in 13 cases [10.1 %], undifferentiated large cell carcinoma in 9 cases [6.9%], bronchioloalveolar carcinoma was 4 cases [3.1%]. The lymph node dissection with pneumonectomy [42 cases], lobectomy [14 cases] and pneumonectomy [6 cases], lobectomy [9 cases] without lymph node dissection were performed. The post operative TNM Staging[AJC] in 72 cases were Stage I in 24 cases, Stage II in 27 cases, and Stage III in 21 cases. Overall resectable was possible in 72 cases [55.8 %], and the operation mortality was 5.6 % [4 cases].

성인의 선천성 식도.기관지루 6례 보고

허용,강경훈,문경훈,김병열,이정호,유회성,손진희,박효숙,Hur, Y.,Kang, K.H.,Moon, K.H.,Kim, B.Y.,Lee, J.H.,Yu, H.S.,Sohn, J.H.,Park, H.S. 대한흉부심장혈관외과학회 1988 Journal of Chest Surgery (J Chest Surg) Vol.21 No.3

We had been experienced 6 cases of congenital esophagobronchial fistula which underwent surgical intervention in all cases. Of the 6 patients, 5 patients were male, one patient was female. The mean age of patients was 37.8 years old and clinical symptom free period was 27.1 years. According to Braimbridge`s classification, they were belonged to the type II[3 cases], type III[2 cases], <% type I[1 case]. Pre-operative diagnosis was available in 4 cases and the 2 cases could be diagnosed at operation field. The fistulectomy were performed in all cases, concomitant segmental resection[1 case], lobectomy[1 case], bi-lobectomy[1 case], and pneumonectomy[3 cases] were combined.

인공심장판막 실패에 대한 재치환술의 임상적 고찰

최병철,유환국,안욱수,허용,김병열,이정호,유회성,Choi, B.C.,Yoo, H.K.,Ahn, W.S.,Hur, Y.,Kim, B.Y.,Yoo, H.S. 대한심장혈관흉부외과학회 1991 Journal of Chest Surgery (J Chest Surg) Vol.24 No.7

To evaluate risks, complications and mortality of reoperations on heart valve prosthesis, we reviewed clinical records of 53 patients who underwent reoperation because of prosthetic valve failure[PVF], from Jan 1959 through Jun. 1991. They had undergone 48 mitral, 10 aortic valve rereplacement Primary tissue failure was the main cause of reoperation : it occurred in 51 valves at a mean postoperative interval of 58 months. Calcification and collagen disruption of prosthesis were main causes of primary tissue failure in macro and micropathology, In 3 failing mechanical prostheses, paravalvular leak was in 2 cases, another one case had the thrombi at the hinge portion. If conditions such as emergency operation with or without endocarditis, thromboembolism and advanced NYHA functional class are prevented, we think that reoperative valve replacement has similar morbidity and mortality to initial valve replacement surgery. But our sturdy represents higher mortality [22.6%] because of late surgical intervention failing the prevention of conditions leading to myocardial damage. In conclusion if the tearing, calcification, and a new murmur were detected the early reoperation should be considered to increase late survival.

낭종성 종격동종양의 임상적 고찰: 11례 보고

허용,이상목,이섭,유환국,안욱수,김병열,이정호,유회성,Hur, Y.,Lee, S.M.,Lee, S.,Yu, H.K.,Ahn, W.S.,Kim, B.Y.,Lee, J.H.,Yu, H.S 대한흉부심장혈관외과학회 1991 Journal of Chest Surgery (J Chest Surg) Vol.24 No.10

Congenital cysts of the mediastinum are rare, but interesting lesions. Such cysts are important because they may produce distressing symptoms and because some have a malignant potential. Mediastinal cysts of foregut origin represent an important diagnostic group. Classified according to their anomalous embryonic origins they include pericardial, bronchogenic, esophageal, enteric, and nonspecific cysts. A series of 11 consecutive surgically treated cases from the Dep. of Thoracic & Cardiovascular Surgery in National Medical Center from Oct. 1959 to Dec. 1990, all successfully resolved without mortality. The 8 bronchogenic, 1 enteric, & 2 non specific cysts are included in this series. And 2 of 11 were asymptomatic patients presented. The clinical & pathological behavior of the individual cysts comprise a wide variety of patterns. Proper utilization of the many diagnostic tests available can accurately characterize the cysts. The exact histologic diagnosis, however, is rarely made prior to operation.

속도장-압력장 동시측정 기술개발

도덕희(Doh D.H.),조효제(Jo H.J.),김병열(K. B.Y.),문경록(Moon K.R.),이창제(Lee C.J.) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-

A simultaneous measurement system for the velocity field and the pressure field of fluid flows is constructed. The measurement system consists of a PIV system and a pressure measurement system. The pressure fields are calculated by using the velocity field obtaind by the PIV system and the reference pressure measured simultaneously at a reference point. The flow field around a rectangular bluff body square is investigated, and the characteristics between the flow fields and the pressure field near the body are discussed.