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CFAR 검파기법을 이용한 주파수 영역 부분적응 어레이 알고리듬
문성훈,한동석,Mun, Seong-Hun,Han, Dong-Seok 대한전자공학회 2001 電子工學會論文誌-SP (Signal processing) Vol.43 No.2
본 논문에서는 주파수 영역 적응 어레이의 계산량을 감소시키기 위한 주파수 영역 부분적응 어레이 알고리듬인 센서링(censoring) 알고리듬을 제안하고, 이를 공간평활(spatial smoothing) 기법과 결합하여 공간평활로 인한 계산량 문제를 해결할 수 있는 센서링 공간평활 알고리듬을 제안한다. 제안한 센서링 알고리듬은 CFAR(constant false alarm rate) 검파기법을 이용하여 각 주파수 대역에 간섭신호가 있는지를 판단하고 간섭신호가 있는 주파수 대역의 해당 가중치에 대해서만 적응 알고리듬을 적용한다. 모의실험을 통하여 제안한 알고리듬을 사용한 GSC(generalized sidelobe canceller)가 기존의 주파수 영역 LMS(least mean square) 알고리듬을 사용한 GSC에 비하여 크게 줄어든 계산량으로 빠르게 간섭신호를 제거함을 확인하였다. This paper proposes a frequency-domain partially adaptive algorithm, called a censoring algorithm, to reduce the computational complexity of the frequency domain adaptive array. The proposed censoring algorithm determines the existence of interferences in the frequency-domain at each frequency bin using a constant false alarm rate (CFAR) processor. The censoring algorithm adapts only those parts of the weights that correspond to the frequency bins expected to contain interferences. The censoring algorithm is also expanded to overcome the signal cancellation phenomenon caused by smart jammers. Accordingly, a censoring spatial smoothing, which combines the censoring algorithm with spatial smoothing, is proposed. Simulation results show that the proposed algorithms are effective in removing interferences with only part of the computational complexity of conventional algorithms yet with the same level of performance.
Von Willebrand factor 이상을 보이는 Heyde 증후군
이태영 ( Lee Tae Yeong ),한상영 ( Han Sang Yeong ),문성훈 ( Mun Seong Hun ),장채령 ( Jang Chae Lyeong ),장진석 ( Jang Jin Seog ),박미경 ( Park Mi Gyeong ),이종훈 ( Lee Jong Hun ),노명환 ( No Myeong Hwan ),신우원 ( Sin U Won ),최 대한소화기학회 2004 대한소화기학회지 Vol.43 No.2
A 68-year-old woman with known severe aortic stenosis was admitted to the hospital because of hematochezia and dizziness. She had received several blood transfusions over the preceding 3 years and undergone right hemicolectomy 2 years ago for severe lower gastrointestinal bleeding. Postoperative histology revealed angiodysplasia involving the ascending colon. After the hemicolectomy, she continued to have hematochezia and anemia and required additional blood transfusions for anemia. During this admission, platelet count, activated partial- thromboplastin time, von Willebrand factor antigen, and von Willebrand factor ristocetin cofactor were normal. She had a severe deficiency of high-molecular-weight multimers of von Willebrand factor. Colonoscopy showed angiodysplasia in the transverse colon at this time. Successful coagulation of the bleeding angiodysplasia was achieved by argon plasma coagulator. No additional bleeding was observed thereafter. We report a case of Heyde`s syndrome with abnormal von Willebrand factor in a patient who presented with intestinal angiodysplasia and aortic stenosis. (Korean J Gastroenterol 2004; 43:133-136)
대한간학회지 제8차 춘계학술대회 초록집 : 포스터 전시 ; 악성흑색종에 의한 전격성 간부전 1예
주희린 ( Ju Hui Lin ),유정남 ( Yu Jeong Nam ),문성훈 ( Mun Seong Hun ),조정환 ( Jo Jeong Hwan ),이종훈 ( Lee Jong Hun ),노명환 ( No Myeong Hwan ),한상영 ( Han Sang Yeong ),최석렬 ( Choe Seog Lyeol ),신우원 ( Sin U Won ) 대한간학회 2002 Clinical and Molecular Hepatology(대한간학회지) Vol.8 No.2(S)
송진우 ( Song Jin U ),김명환 ( Kim Myeong Hwan ),서욱장 ( Seo Ug Jang ),오동렬 ( O Dong Lyeol ),김기덕 ( Kim Gi Deog ),문성훈 ( Mun Seong Hun ),양동훈 ( Yang Dong Hun ),송문희 ( Song Mun Hui ),이상수 ( Lee Sang Su ),서동완 ( Seo D 대한소화기학회 2003 대한소화기학회지 Vol.42 No.5
Eosinophilic pancreatitis is a rare disorder that may only be diagnosed after pancreatic resection under the suspection of a pancreatic tumor. We experienced a 65-year-old female patient whose initial presentation suggested pancreatic cancer. Radiologic evaluation revealed a pancreatic mass-like lesion which was obstructing the main pancreatic duct. Endoscopic retrograde cholangiopancreatography (ERCP) showed double duct strictures involving the distal common bile duct and the main pancreatic duct. Serum IgE level was elevated. Percutaneous core needle biopsy with an 18-gauge needle was performed targeting the pancreatic lesion. The biopsy specimen revealed fibrotic interlobular septum and intralobular fibrosis with prominent eosinophilic infiltration. The patient was treated with oral prednisolone (40 mg/day). A plastic stent was inserted into the narrowed common bile duct. After three months of oral steroid therapy, symptoms and signs improved rapidly and serum IgE level was decreased. Abdominal computed tomography and ERCP revealed remission of pancreatic mass-like lesion. (Korean J Gastroenterol 2003;42:444-449)