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김현종(Hyun Jong Kim),홍운기(Woon Ki Hong),조철균(Chol Kyoon Cho) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.5
N/A Chronic pancreatitis in Korea has increased according to the change of diet. The conservative treatment of chronic pancreatitis was limited in symptomatic relief of pain and associated complications, so surgical approches in managements have been proposed to relieve the intractable pain and maintain the exocrine and endocrine function of pancreas. The surgical procedures were drainage of main pancreatic duct and resection of diseased portion of pancreas. 8 patients were treated surgically at the department of surgery, Chonnam University Hospital frorn January 1985 to December 1992. 7 patients were man. Indications of surgery were intractable pain and duodenal obstruction due to complication. Operative procedures were two Whipple's procedure, three longitudinal pancreaticojejunostomy, one distal pancreatectomy, one sphincteroplasty and one gastrojejunostomy in duodenal obstruction. Except bypass patient, seven patients improved in relief of pain and nutrition.
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신현성 ( Hyun-sung Shin ),홍교영 ( Gyo-young Hong ),한지애 ( Ji Ae Han ),홍운기 ( Woon Ki Hong ) 한국항행학회 2017 韓國航行學會論文誌 Vol.21 No.6
최근 항공교통량이 폭발적으로 증가됨에 따라 항공로 수용력 증대를 위한 다양한 연구가 진행되고 있다. 기존 VOR/DME장비를 기준으로 설정된 항공로 상 분리간격의 한계를 보완하기 위하여 인공위성을 활용하는 GNSS가 고려되고 있다. 또한 GNSS 오차를 보정할 수 있는 시스템인 SBAS를 이용하여 더욱 더 정확한 위치정보를 얻으려 노력하고 있다. ICAO에서는 2025년까지 SBAS 도입을 권고하고 있고 우리나라 또한 2014년부터 한국형 SBAS인 KASS개발에 착수하였다. 이에 KASS 개발에 따른 노력으로, 적절한 수신기 설계가 요구되어 본 논문에서는 측정항목에 대한 간섭임계값 및 위성 수신 안테나의 앙각에 따른 수신 안테나 이득을 분석하였다. Recently, as the air traffic volume has been explosively increased, various studies are being conducted to increase the air passenger capacity. In order to compensate the limitation of the separation distance on the aerodrome established on the basis of existing VOR / DME equipment, GNSS utilizing satellite is considered. In addition, we are trying to obtain more precise location information by using SBAS, a system that can correct GNSS error. ICAO recommends introducing SBAS until 2025, and Korea has also started to develop KASS, a Korean SBAS since 2014. Therefore, in this paper, we analyze the interference threshold for the measurement items and the receiving antenna gain according to the elevation angle of the satellite receiving antenna.
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EGNOS 사례를 활용한 KASS 비행시험 요구 사항 분석
손성진 ( Sung-jin Son ),홍교영 ( Gyo-young Hong ),홍운기 ( Woon Ki Hong ),김군택 ( Koon-tack Kim ) 한국항행학회 2017 韓國航行學會論文誌 Vol.21 No.6
SBAS는 위성기반 항법보정시스템으로 지상국에서의 GNSS신호 분석을 기반으로 정지궤도위성을 통해 GNSS신호의 보정정보와 무결성정보를 제공하는 시스템이다. 한국형 SBAS인 KASS는 2022년 APV-1급 SoL서비스를 목표로 하고 있다. SoL서비스를 제공하기 위해서는 충분한 각종 지상 및 비행시험이 사전에 수행되어야 한다. 그러나 국내에서는 아직 한국형 SBAS인 KASS가 증축되지 않은 관계로 구체적 세부 평가항목이 제시되어 있지 않다. KASS와 호환성이 가장 높을 것이라 예상되고 현재 개발 후 서비스되어 지고 있는 EGNOS는 평가항목이 이미 제시되어있다. 본 논문에서는 EGNOS 구축에 적용된 규정서를 분석하여 비행시험시 요구되는 지상 및 비행시험 평가항목들의 기준을 분석하였고 이는 향후, 국가가 수행하는 비행점검 과정에 참고 될 수 있을 것으로 기대된다. SBAS is a satellite based navigation correction system that provides correction information and integrity information of GNSS signal through geostationary satellite based on analysis of GNSS signal in ground station. KASS, a Korean SBAS, is aiming at the APV-1 class SoL service in 2022. Sufficient ground and flight tests must be performed in advance to provide SoL services. However, since KASS, the Korean SBAS, has not yet been added in Korea, specific detailed evaluation items are not presented. EGNOS, which is expected to be the most compatible with KASS and is being serviced after its development, has already been evaluated. In this paper, we analyze the regulations applied to EGNOS construction and analyze the criteria of ground and flight test evaluation items required for flight testing, which is expected to be referenced to the flight inspection process in the future.
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항공 응용 분야 : 차로 제한 조건을 이용한 차로 구분 성능 분석
강우용 ( Woo Yong Kang ),이은성 ( Eun Sung Lee ),박재익 ( Jae Ik Park ),한지애 ( Ji Ae Han ),홍운기 ( Woon Ki Hong ),김현수 ( Hyun So Kim ),허문범 ( Moon Beon Heo ),남기욱 ( Gi Wook Nam ) 한국항행학회 2011 韓國航行學會論文誌 Vol.15 No.3
본 논문에서는 위성항법 기반 교통인프라에서 제공되는 정보를 이용하여 차로 구분에 적용할 때 차로 구분 성능을 향상시키기 위한 차로 제한 조건을 제시하고 시뮬레이션을 통하여 성능을 검증하였다. 차로 제한 조건은 차량의 진행 방향과 차량이 위치하고 있는 차로의 관계를 이용하여 1차로와 마지막 차로의 차로 구분 임계치를 크게 설정하여 차로 구분 성공률을 향상시키는 기법이다. 시뮬레이션 결과 차로 제한 조건을 사용할 경우 4차로에서는 40%, 6차로에서는 25%, 8차로에서는 15%의 성능차로 구분 성능이 향상됨을 확인하였다. This paper focus on lane recognition performance test using a road lane constraint with transport infrastructure information. The constraint is determined through the relation of the drive direction and vehicle position. The road lane constraint sets large limit for first and last lane. To analyze the performance of the proposed method, simulations are carried out. The results show that the lane recognition performance using a constraint is improved 40% at four-lane, 25% at six-lane, 15% at eight-lane.
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후복막강 출혈이 동반된 복부 둔상시 진단적 복강 세척술의 의의
홍운기,조영국,김현종,김영진 대한외상학회 1992 大韓外傷學會誌 Vol.5 No.2
Diagnostic peritoneal lavage is safe, accurate, rapid and effective means in evaluating blunt abdominal trauma. However, one of major problems in this thechnic is the high sensitivity leading to a significant incidence of unnecessary laparotomies. Some investiga- tors pointed out that peritoneal lavage is an inaccurate indicator of retroperitoneal organ injury. They recommended the use of further diagnostic modalities for the diagnosis of retroperitoneal I.njuries, such as abdominal computed tomography, abdominal ultrasonogra- phy, angiography, intravenous pyelogram, cystography and gastrographic upper gastrointes- tinal series. We retrospectively reviewed medical records of 58 cases with blunt abdominal trauma accompaning retroperitoneal hemorrhage, which had been admitted to emergency room of Chonnam University Hopital from Jan, 1988 to May, 1991. All of them were performed peritoneal lavage. Fourth-nine patients had a positve peritoneal lavage and twenty-nine of fourthy-nine had intraperitoneal injury and they were performed surgiacal procedure, the others (twenty patients) had no intraperitoneal injury except retroperitoneal hemorrhge in spite of positive peritoneal lavage. Only four of twenty patients were performed surgical procedure concerned to retroperitoneal organ injury. Nine patients had a negative peritoneal lavage. There was one false negative. As he was more worsening clinically, we performed laparotomy and repaired jejunal perforation in spite of negative peritoneal lavage. We noticed a high incidence of false positive rate (41%) which led to unnecessary nine laparotomies, because they had no another intraabdominal pathologic feature except retroperitoneal hemorrahge. And seven patients were observed and then recorvered well without any complication by roentgenographic imaging studies and repeated physical examination in spite of positive peritoneal lavage. Finally, sensitivity, specificity and false positive rates of diagnostic peritoneal lavage for blunt abdominal injury accompaning retroperitonael hemorrhage are 96.7%, 28.6% and 40.8%. Thus diagnostic peritoneal lavage is an inaccurate indicator of laparotomy for blunt abdominal injury accompaning retroperi- toneal hemorrhge. We also emphasize that diagnostic peritoneal lavage should be carefully interpreted for decision to perform laparotomy so that we can avoid unnecessary laparotomies.
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