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심근경색에서 측부순환 유무에 따른 99mTc-MIBI 심근 SPECT 소견
김덕윤(Deog Yoon Kim),양형인(Hyung In Yang),강홍선(Heung Sun Kang),조정휘(Chung Whee Choue),김권삼(Kwon Sam Kim),김명식(Myung Shick Kim),송정상(Jung Sang Song),배종화(Jong Hoa Bae),김재만(Jae Man Kim),나득영(Deug Young Na),박은경(Eun 대한핵의학회 1994 핵의학 분자영상 Vol.28 No.1
N/A The coronary collateral vessels have revealed their significance in terms of reduction of infarct size, preservation left ventricular function, and prevention of left ventricular aneurysm in patients with myocardial infarction. The purpose of this study were to evaluated the relation between collateral circulation and 99mTc-MIBI Heart SPECT in patient with acute myocardial infarction and their clinical significance. The fifty six MI patients with antegrade TIMI perfusion grade 0 and 1 were studied. The pat#ients #were classified into two groups; Group I inclueded 30 patients with grade 2, 3 Collateral flow. Group II inclueded 26 patients with grade 0, 1 Collateral flow. Collateral filling were graded from 0 to 3; 0- none, 1- Filling of side branch only, 2- Partial filling of the epicardial segment, 3- Complete filling of epicardial segment. Clinical variables, left ventricular function, 99mTc-MIBI Heart SPECT were analyzed with angiographic finding. Results were following: 1) Collateral visualization was found to be greater in patient with invoivement of right coronary artery (RCA). The callateral development site of infarct related artery was RCA 15 cases, left anterior descending artery (LAD) 10 cases, left circumflex artery (LCX) 5 cases, and the collateral circulation from LAD to RCA was 13 cases (40.6%). 2) There was a tendency to be decreased in peak CK activity with group I . 3) The presence of good collateral channels was more frequently 99mTc-MIBI reversible perfusion defect (83.4% vs 15.3%, p<0.05). 4) No differences af left ventrieular end diastolic volume (LVEDV), left ventricular end systolic volume (LVESV), ejection fraction (EF) were noted between group I and group II. The presence of good collateral channels did affect the frequency of occurrence of 99mTc-MlBI reversible perfusion defect.
김재만 ( J M Kim ) 대한임상검사과학회 1991 대한임상검사과학회지(KJCLS) Vol.23 No.1
Recently, the 51Cr-release assay have been used in the measurement of cell-mediated cytotoxicity. The cell-mediated cytotoxicity is dependent on the frequency and activity of effector cells. The number of effector cells relate to the number of target cells. Generally, increase or decrease of the effector cells to the fixed number of target cells induce the increased or decreased cell-mediated cytotoxicity. But, the correlation between the number of effector cells and the number of target cells not always fixed and although the effector cells are numerous to the target cells, the effector cells can not lyse all target cells. However, in the majority of cases, cell-mediated cytotoxicity have been performed in a simple E: T ratios. This method of interpretation can not represents results that have the object because results are simple comparison at one point E : T ratio. Results of cytotoxicity should be considered and represented the two factors of frequency and activity of the effector cells. Thus a trial to interpret by scientific method results of cell-mediated cytotoxicity have been. Cell-mediated cytotoxicity is represented by Exponential fit equation Y =A (1-e-kx). The estimation unit is LU (lytic unit) and one LU defin as that 1 x 106 effector cells lyse a 30% of 5 x 10 3 target cells. In this study, LAK Oymphokine activated killer) cells and NK (natural killer) cells were used as the effector cells and the K562, Hela, MCF-7 and Raji cell-line were used as the target cells. Resuts were represented that interpretation of results utilized LU has the object better than percent(%) lysis according to E : T ratios.
시변 시간 지연을 갖는 불확실한 비선형 시스템의 비약성 보장 비용 제어
김재만(Jae Man Kim),최윤호(Yoon Ho Choi),박진배(Jin Bae Park) 대한전기학회 2012 전기학회논문지 Vol.61 No.3
In this paper, we present a non-fragile guaranteed cost control design method for uncertain nonlinear systems with time varying delays in state and control input, even though the controller gain is perturbed. The uncertain nonlinear term in the systems is norm bounded and the linear matrix inequality(LMI) optimization method is employed as a stability analysis of the systems. We design a robust controller and show the asymptotical stability of uncertain time-varying systems based on Lyapunov method. Also, we guarantee a specific level of performance of the systems. The simulations are carried out to demonstrate the effectiveness of the proposed method.