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전투기 흡입구 해머쇼크 설계압력에 대한 확률론적 접근법
배효길,이훈식,김윤미,정인면,이상효,조대영 항공우주시스템공학회 2019 항공우주시스템공학회지 Vol.13 No.5
Inlet hammershock is the critical loads condition for designing the inlet duct structure of a fighter. The sudden flow reduction in engine compressor causes inlet hammershock with high pressure. The traditional method was used to combine extreme conditions (maximum speed, sea level altitude, and cold day) to analyze this compression wave inlet hammershock pressure. However, after the 90s there have been papers that presented the probabilistic approach for the inlet hammershock to achieve the appropriate design pressure. This study shows how to analyze the inlet hammershock pressure by making practical use of the Republic of Korea Air Force real flight usage data under probabilistic approach and then analyze approximately 30% decreased inlet hammershock pressure compared with the traditional valve. 전투기 흡입구 덕트 구조물 설계에 중요한 하중조건으로 흡입구 해머쇼크 조건이 있다. 엔진 압축기 내부유동의 갑작스런 감소에 의하여 큰 압력의 해머쇼크가 발생하게 된다. 압축충격파인 흡입구 해머쇼크 해석을 위한 전통적인 방법은 극단적인 조건들의 조합을(최대 속도, 해수면, 저온 대기) 이용하였지만, 90년대 이후 확률론적 방법을 통해 적절한 해머쇼크 설계압력을 제시한 논문들이 발표되었다. 이를 참고로 본 연구는 한국공군의 비행운용데이터를 활용하여 흡입구 해머쇼크 압력을 확률론적으로 접근하였고, 이를 통해 전통적인 방법 대비 약 30 % 감소된, 흡입구 설계용 해머쇼크 압력을 해석하였다.
박일영,이훈효,최승혜,이성,박승만,윤상섭,임근우 대한응급의학회 1997 대한응급의학회지 Vol.8 No.2
The frequency of stab wounds is gradually increasing and patients with stab wounds visit the hospital through the emergency room. Management options for patients with stab wound include mandatory exploration and selective observation, but recently many authors have emphasized the importance of selective conservation with development of diagnostic procedure and controversy still exists concerning the management of patients with stab wounds. We retrospectively analysed the clinical data of 78 patients with stab wounds who visited the emergency room of St. Paul`s Hospital over 5 years from January 1 1992 to December 31 1996. The following results were obtained; 1) The most prevalent age group were the twenties & the thirties(58.9% of patient) and then most patients were of young age. The male to female ratio was 2.9:1. 2) Most injuries occured at night between 8 p.m. and 4 a.m.(61.5%)and during September injuries were most frequent. 3) The most common causes of stab wound were fighting(55.1%) followed by suicide(21.8%), then accidents including traffic accidents(16.7%) and robbery(6.4%). 4) The instruments most commonly used were knives(53.8%) and broken glass(28.2%). 5) Half of patients were drunk from alcohol and in 3 cases from an antipsychotic drug. 6) In 11 cases(14.1%), there were multiple wound sites and in 8 cases(10.3%) superficial wounds into subcutaneous fatty tissue. 7) According to stab wound sites, the extremities were wounded in 36 cases(46.2%), chest in 21 cases(26.9%), abdomen in 15 cases(19.2%) and neck in 7 cases(9.0%). 8) Emergency explorations were performed in 43 cases(55.1%)under general or regional anesthesia, which included neck in 4 cases(9.3%), chest in 3 cases(7.0%), abdomen in 11 cases(25.6%) and extremity in 25 cases(58.1%). In exploratory laparotomy, negative exploration rate was 18.2%. 9) Death occured in 2 cases(2.6%). One died due to sepsis with multiple colon perforation and the other due to hypovolemic shock with Superior Vena Cava injury.
문인성,박장상,고용복,이훈효,김승남 대한혈관외과학회 1997 Vascular Specialist International Vol.13 No.1
The femoropopliteal arterial bypass is one of the most widely used vascular procedures for arterial reconsturctions of infrainguinal region. We performed 71 femoropopliteal bypass operations in 54 patients from January 1993 to December 1995 at the Dept. of surgery, Kangnam St. Mary's Hospital in Catholic University Medical College. We reviewed these patients retrospectively with admission and out paient charts with following results. 1) Most of patients were male in 50(92.6%) with peak incidence in the seventh decade 29(53.7%). 2) The etiologies were artherosclerosis obliterans(ASO) in 92.6% and thromboangitis obliterans(TAO) in 7.4%. 3) The associated diseases were 31 hypertensions (57.4%), 18 diabetes mellitus(33.3%), 3 chronic renal failures(5.6%), 2 abdominal aortic aneurysms(3.7%) and 2 cerebrovascular accidents(3.7%). 4) We used PTFE(polytetrafluoroethylene) synthetic graft in 65 cases and autogenous saphenous vein in 7 cases for graft material. 5) The inflow procedures were performed simultaneously in 36 cases(50.7%), which were 26 aortobifemoral bypasses, 7 iliofemoral bypasses, 2 AAA(abdominal aorta aneurysm) repairs and 1 aortobiliac bypass. The additional outflow procedures were performed in 6 cases; 4 Taylor's patches and 2 Miller's cuffs. 6) The primary patency rate at six months 93.3%, one year 87.3%,two years 68.3%, three years 48.8% and the secondary patency rate at six months was 93.8%, one year 87.3%, two years 71.2%, three years 61.1. 7) The complications after bypass were 6 wound problems, 3 major amputations, 1 lymphatic leakage, but there were no death cases. Even though our primary patency rate of the femoropopliteal bypass was somewhat poorer than that of reported foreign data, we could find secondary patency rate was acceptable with others by aggressive vascular approaches. After femoropopliteal bypass, even consecutive below knee vascular reconstruction, poor vasculatures were seemed to be the leading cause to major amputations and toe amputations. Further clinical study should be followed in the future.