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김영수,김영수,김창주,박한규,최상삼 한국통신학회 1997 韓國通信學會論文誌 Vol.22 No.7
In this paper, we present a performance improvement method for the direction-of-arrival (DOA) estimation algorithm of the narrowband signals incident on a uniform circular array. It is very important to estimate the covariance matrix effectively because the performance of DOA algorithm mainly depends on the exactness of the sampel coveriance matrix which is computed from the received samples of signals. In case of uniform circular array with the even number sensors, the structure of the arrray has a useful geometrical property. Therefore we present the method which can estimate covariance matrix more effectively using this property. The simulation results are shown to demonstrate the superior perfodrmance obtained by the proposed covariance matrix estimation method relative to that of the conventional estimation method.
김영수,김영수 한국전자파학회 2000 한국전자파학회논문지 Vol.11 No.8
본 논문에서는 임의 배열 안테나에 입사하는 다중 협대역 인코히런트 신호를 분리 추정하기 위한 분해능 향상 알고리즘을 제안한다. 도래각 추정 알고리즘의 분해능은 배열 안테나 개구면의 크기에 좌우되므로 분해능을 좋게 하기 위해서는 개구면을 크게 해야 한다. 그러나 실환경하에서 배열 안테나의 개구면 크기를 증기시키는 것은 비 실용적이므로 배열 안테나의 센서간격을 가상적으로 확장시킴으로서 개구면의 크기를 증가시키고 적절한 변환 행렬을 사용하여 이 가상 배열 안테나의 스티어링 행렬을 구하는 방안을 제시한다. 시뮬레이션을 통하여 비교분석한 결과 등간격 협대역 인코히런트 신호가 원형배열 안테나에 입사되었을 경우에 제안된 방법이 표준 MUSIC보다 뛰어난 분해성능을 보여주었다. In this paper, we propose a resolution enhancement method for estimating direction-of-arrival (DOA) of narrowband incoherent signals incident on a general array. The resolution of DOA algorithm is dependent on the aperture size of antenna array. But it is very impractical to increase the physical size of antenna array in real environment. Therefore we propose the method that increases the aperture size by virtually expanding the sensor spacing of original antenna array and then construct the steering matrix of the virtual array using the proper transformation matrix. Superior resolution capabilities achieved with this method are shown by simulation results in comparison with the standard MUSIC for incoherent signals incident on a uniform circular array.
김영수,Kim, Yeong-Su 축산물품질평가원 2015 KAPE누리 Vol.229 No.-
우리나라는 식육 역사가 짧다. 여기에 부정확한 자료가 사실인 냥 유통되고, 과열 먹방이 더해지고 있어 더 많은 육식 괴담이 성행할 것이다. 영화와 TV프로그램 가이드가 있듯, 원초적 미각 단계에서 '식문화(食文化)'단계로 업그레이드 시키는 음식문화 가이드의 양성이 긴요하다.
간암 절제술 후 후기 합병증으로 발생한 기관지담관루의 치료 1 예
김영수,이진우,박현신,김인한,이돈행,김범수,김형길,문계혁,김승연,조진경 대한소화기내시경학회 2001 Clinical Endoscopy Vol.23 No.2
A bronchobiliary fistula (BBF), which is defined by an abnormal communication between the biliary system and the bronchial tree, is an uncommon complication after hemihe-patectomy, trauma, hydatid disease, choledocholithiasis, and other causes of biliary obstruction, BBF are rare complication of hepatic resection that can present from days to years after operation. Management of fistula is often very difficult and can be associated with high morbidity and mortality rates. Early recognition and proper management are essential to avoid a fatal outcome. Endoscopic retrograde cholangiopancreatography (ERCP) and percutaneous trans-hepatic cholangiography (PTC) are the diagnostic studies of choice and offer the possibility of therapeutic intervention. Although large series in the literature emphasize the surgical management of BBF, the reoperative procedures tend to be complicated, with a significant morbidity and mortality. Nonsurgical intervention via ERCP or PTC are more recently notably successful when resolution of a distal biliary obstruction is accomplished. Only after aggressive attempts at nonoperative, interventional techniques have failed should operative approaches be entertained. We are reporting a case of BBF secondary to hepatic resection of hepatocellular carcinoma which was managed by surgical operation.