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엘레멘트 인버스 재킷 변환과 유사한 DFT의 새로운 희소 행렬 분해
이광재,박대철,이문호,최승제,Lee, Kwang-Jae,Park, Dae-Chul,Lee, Moon-Ho,Choi, Seung-Je 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.4C
This paper addresses a new representation of DFT matrix via the Jacket transform based on the element inverse processing. We simply represent the inverse of the DFT matrix following on the factorization way of the Jacket transform, and the results show that the inverse of DFT matrix is only simply related to its sparse matrix and the permutations. The decomposed DFT matrix via Jacket matrix has a strong geometric structure that exhibits a block modulating property. This means that the DFT matrix decomposed via the Jacket matrix can be interpreted as a block modulating process. 본 논문은 엘레멘트 인버스 처리에 근거한 재킷 변환을 통한 DFT 행렬의 새로운 표현을 다룬다. DFT 행렬의 역을 단지 재킷 변환의 소행렬 분해에 따라 표현하며 이러한 결과는 DFT 행렬의 역이 단지 이의 희소 행렬과 치환 행렬에만 관련됨을 보여준다. 재킷 행렬을 통한 DFT 행렬의 분해는 블록 변조 특성을 나타내는 강한 기하 구조를 갖는다. 이는 재킷 행렬을 통해 분해된 DFT 행렬은 블록 변조 과정으로 해석할 수 있음을 의미한다.
박제우(Park Je-Woo),김흥진(Kim Hong-Jin),이광재(Lee Kwang-Jae),김대근(Kim Dai-Keun),조지성(Jo Ji-Seong) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
Increasing heights of tall buildings often require supplementary damping system for occupant comfort in windy condition. This paper presents a liquid column vibration absorber (LCVA) installed in a 64-story building, which is the highest residential building with flat plate structural system in Korea, for mitigation of wind-induced motion. LCVA is a special type of secondary mass-type dampers relying on the motion of a column of liquid in a U-shaped container to counteract the forces acting on the structure. Since it has different dimensions for vertical and horizontal portions of container, it has benefits of easy tuning and wide natural frequency range. To evaluate the control performance of LCVA, an experiment using 1/20 scaled model is performed. The test structure is excited using a sinusoidal signal ranging 0.1~3.0㎐ with 5.5㎜ displacement, and acceleration and displacement of the structure, water height, and shear force are measured. Experiment results indicate that the LCVA increase the energy dissipation capacity of the building significantly
증례 : 소화기 ; 간내 담관암 환자에서 발생한 간기관지루 1예
김정훈 ( Jeong Hoon Kim ),배상훈 ( Sang Hoon Bae ),배영석 ( Young Seok Bae ),이광재 ( Kwang Jae Lee ),홍준호 ( Jun Ho Hong ),윤정빈 ( Jeong Bin Yoon ),제인수 ( In Soo Je ) 대한내과학회 2009 대한내과학회지 Vol.77 No.5S
저자들은 고열과 가래 그리고 객혈을 주소로 내원한 간내담관암 환자에서 화농성 간병변으로부터 간기관지루가 형성된 것을 농양조영술을 통해 확인하였고, 경피적 배농술과 항생제 치료로 증상을 호전시켰다. 이후 간내 담관암이 인접장기로 전이되어 보존적 수술을 시행하였고, 수술 후 특이 증상의 호소 없이 지내다가 담관염과 폐렴을 동반한 패혈증으로 인해 사망에 이르게 된 1예를 경험하였기에 문헌고찰과 함께 이를 보고하는 바이다. We report an uncommon hepatobronchial fistula in a patient with a liver abscess and cholangiocarcinoma. A 66-year-old man was admitted because of a fever, right upper quadrant pain, and hemoptysis with a fishy smell. At admission, computed tomography showed an intrahepatic abscess located near the dome. Diagnostic percutaneous transhepatic cavitography disclosed a hepatobronchial fistula and a biopsy revealed intrahepatic cholangiocarcinoma. After antibiotic therapy and percutaneous drainage of the hepatic abscess for 5 weeks, his symptoms disappeared. However, he died of sepsis from cholangitis and pneumonia despite surgery and intensive medical treatment. (Korean J Med 77:S1137-S1141, 2009)
난소절제후 Estrogen을 투여한 흰쥐 대동맥에서 Protein Kinase C-α와 Fas 발현의 변화
이왕수,이상엽,안지현,송영빈,김학진,이광재,유재격,김상욱,김태호,김치정,류왕성 중앙대학교 의과대학 의과학연구소 2001 中央醫大誌 Vol.26 No.3
Estrogen is believed to decrease coronary artery disease. Protein kinase C-α(PKCα)appear to be important in signal conduction pathways. Estrogen treatment increases catalytic activity of PKCα,and activation of PKCαcan modulate estrogen receptor levels and responsiveness. And it was reported that activation of PKC can protect cells from apoptosis induced by Fas ligation. But the beneficial effect of estrogen on PKCαwas not clearly demonstrated. The objective of this study was to evaluate the role of PKCαafter ovariectomy and estrogen therapy in rat aorta. The results were summarized as below: 1. The significant pathological changes were not observed in the rat aorta irrelevant to ovariectomy and estrogen therapy. 2. The expression of Fas was decreased in the aorta of estrogen-treated rats than that of ovariectomized rats without estrogen therapy. 3. Increased expression of PKCαwas more marked in the aprta of estrogen-treated rats than that of ovariectomized rat without estrogen therapy. In conclusion,PKCαmay be important in signal conduation pathway on the effect of estrogen. Activation of PKCαby estrogen reduced Fas expression, suggesting that PKCαactivation may play a role in protection against atherasclerosis. Further studies are needed to elucidate the role of PKCαafter estrogen therapy.
김호동,이광재,김진홍,조성원,이규현,진윤미,고준호,고광현,고영윤,원제환,함기백 대한소화기학회 2000 대한소화기학회지 Vol.36 No.1
Wandering spleen is a rare condition characterized by laxity or absence of the supporting splenic ligaments, in which a long pedicle allows the spleen to migrate from its normal position in the left upper quadrant. The patients are usually asymptomatic. When torsion of the pedicle occurs, a variety of clinical manifestations from mild intermittent abdominal pain to acute abdominal crisis may occur. We experienced a case of wandering spleen mimicking tumor in the left lobe of the liver in a 65-year-old female, and the spleen scan was useful for the diagnosis.
고윤웅,한지숙,오제덕,이선주,이광재,양우익 대한감염학회 1991 감염 Vol.23 No.2
The Aspergilli are among the most common and ubiquitous saprophytic fungi in the environment. Aspergillosis is divided into several cartegories, among which the invasive aspergillsois (IA) causes significant morbidity and mortality in immunocompromized host especially from pulmonary infection. The clinical aspect off 40 cases of aspergillsois were studied. who were admitted Severance Hospital between January, 1985 and June, 1990. The following results were observed. 1) Among these 40 cases, 1 was diagnosed as allergic aspergillsois, 25 as aspergilloma (pulmonary 22, paranasal sinus 3), 11 as IA (pulmonary 5, brain 3, sinus with contiguous invasion 3) and 3 as pleural aspergillsois. 2) Among 22 cases of pulmonary aspergilloma, the most frequently associated underlying diseases were pulmonary tuberculosis in 17 and others were COPD in 3, bronchiectasis in 2 and bronchial asthma in 1. Among 5 cases of invasive pulmonary aspergillsois (IPA), acute lymphocytic leukemia was the underlying disease in 3, acute myelogenous leukemia in 1 and myelodysplastic syndrome in 1. 3) The specific diagnosis of aspergilloma was made by surgical biopsy in 15, transbronchial lung biopsy in 4 and compatible finding of chest X-ray with positive antibody against Aspergillus antigen in 6. Among 3 cases of pleural aspergillsois, 2 were diagnosed by pleural biopsy and 1 by culture of pleural fluid. 4) In cases of IA, the specific diagnosis was made by histopathologic findings in 9. Among 5 cases of IPA, 2 were diagnosed by needle aspiration biopsy, 2 by clinical diagnostic criteria and 1 by open lung biopsy. 5) The severe granulocytopenia (<500/㎣) before pulmonary infiltrates was noted in all cases of IPA. 6) All the 22 cases of pulmonary aspergilloma were improved with surgical resection in 13 and 9 with conservative treatment. In contrast, 3 of 5 IPA were dead inspite of amphotericin B treatment and 2 were recovered with improvement of underlying disease or granulocytopenia. Six cases of invasive sinus or brain aspergillosis were improved with surgical removal and amphotericin B treatment, and 2 pleural aspergillosis with surgical drainage. With the above results, several types of aspergillosis were confirmed and the prognosis seemed to depend on underlying disease. Because of high fatality of IPA, it is more stressed that the pro-phylactic measures, efforts of discernible diagnostic approaches and as early empirical antifungal treatment as possible might give rise to not only the therapeutic success of IPA but also the improvement in prognosis of underlying diseases.
김진홍,김상돈,김윤정,이한민,엄철,지석배,이광재,조성원,임현이 대한소화기내시경학회 1998 Clinical Endoscopy Vol.18 No.3
Since amyloidosis is usually diagnosed later in the disease process, a high index of suspicion is therefore necessary for earlier diagnosis. Confirmative diagnosis rests on a biopsy of the involved organ. Gastrointestinal amyloidosis causes a variety of symptoms including intestinal obstruction, ulcers, malabsorption, hemorrhaging, protein loss, diarrhea, anorexia, nausea, vomiting, and dysphagia. We confirmed amyloid deposits in the stomach in three patients with epigastric pain through a biopsy of erosive gastritis documented on a gastrofiberscopy. One patient with primary amyloidosis which had invaded his kidney, stomach, and heart, expired, although aggressive treatment with a pacemaker insertion, peritoneal dialysis, and ventilator care was performed. Another patient with multiple myeloma died on the 38th day, after having started systemic chemotherapy. The other patient with secondary amyloidosis due to rheumatoid arthritis, is currently receiving colchicine at our out patient clinic.