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이광의(Kwang Eui Lee),정철주(Chul Ju Jung),장직현(Jik Hyun Chang) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.2B
본 논문에서는 최소신장트리 문제에 대한 효율적인 병렬 알고리즘을 제시한다. n개의 정점과 m개의 간선을 가진 그래프가 입력으로 주어졌을 때, 이 알고리즘은 EREW PRAM 상에서 O((n+m)/log n)의 처리기를 이용하여 O(log² n)의 시간 내에 원하는 결과를 내준다. 본 논문에서 제시하는 최소신장트리 알고리즘을 기존의 EREW PRAM 알고리즘들에 비하여 더 작은 비용을 가진다.
급성 심근경색 : Gd-DTPA 조영증강 자기공명영상 Gd-DTPA Enhanced Magnetic Resonance Imaging
정경일,김제현,이창호,이영주,김한수,소동문,이영돈,박경주,왕희정,탁승제,이철주,김선용,김옥화,임태환,문창현,최병일,서정호 아주대학교 의과학연구소 1996 아주의학 Vol.1 No.1
This study was undertaken to determine the value of gadolinium dimeglumine (Gd-DTPA) enhanced MRI in the diagnosis of acute myocardial infarction. Seven cats were subjected to 2 hours of left anterior descending coronary arteryocclusion (group 1) and 8 cats to 1 hour of occlusion (group 2). Reperfusion was followed by taking Tl-weighted MR images at 5, 15, 30, 45, 60 minutes after Gd-DTPA (0.2 mmol/kg) injection. Myocardial enhancement patterns were categorized into three zones (central ischemic, peripheral ischemic, and normal) or two zones (ischemic and normal) and the presence of injured myocardium in each zone was confirmed by 2,3,5-triphenyltetrazolium chloride (TTC) staining. Signal intensity (SI) of each zone was evaluated relative to back muscle in regard to its chronological changes and difference among the zones. Group 1 displayed three zones of enhancement in 6 cats whereas 1 cat in group 1 and all in group 2 showed two zones of enhancement. Intermediate SI central zone was compatible but smaller than TTC nonstained area, and determined to be a persistently occlusive injury. High SI peripheral zone in group 1 and high SI ischemic zone in group 2 were stained and determined as reperfused injury although reversibility was not definite. The peak SI, occurring 15 minutes after Gd-DTPA injection, of 2.47±0.48 at peripheral zone was greater than that of 1.66±0.36 at central zone in group 1 and of 1.81±0.41 at ischemic zone in group 2 (p < 0.05). SI of injured myocardium increased more rapidly and decreased more gradually than that of normal myocardium. That the features of SI change with time in injured myocardium was compatible with the results of other studies using different contrast agents. Gd-DTPA enhanced MRI differentiated persistently occlusive injury as central intermediate SI, and reperfused injury as homogenous high SI, with the maximal contrast between the two at 15 minutes after contrast injection, thus indicating the value of Gd-DTPA enhanced MRI in the diagnosis of acute myocardial infarction.