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내포 병렬성을 가지는 OpenMP 프로그램의 최초 경합 탐지
천병규,우종정,전용기,Chon, Byoung-Gyu,Woo, Jong-Jung,Jun, Yong-Kee 한국정보처리학회 2001 정보처리학회논문지 A Vol.8 No.3
공유 변수를 가지는 병렬 프로그램의 오류 수정에서 경합 탐지는 중요하다. 왜냐하면, 경합은 프로그램의 비결정적인 수행을 유발하기 때문이다. 기존에 제시된 병렬 프로그램의 오류 수정 기법인 수행중 탐지 기법은 내포된 병렬 프로그램에서 최초 경합 탐지를 보장할 수 없다. 최초 경합을 수정하면 이후에 발생하는 경합들이 나타나지 않을 수 있으므로, 최초경합의 탐지는 중요하다. 본 논문에서는 내포 병렬 루프 프로그램을 대상으로 반복 수행을 통해서 최초경합을 탐지하는 기법을 제시한다. 반복 수행의 횟수는 최악의 경우에 프로그램의 내포 깊이 만큼이며 각 수행시의 효율성은 공유변수의 개수를 V, 프로그램의 최대 병렬성을 T라 할 때, 공간 복잡도 O(VT)와 시간 복잡도 O(T)를 가지므로 기존의 수행중 탐지 기법과 동일하다. 그러므로 본 기법은 효과적이고 실용적인 오류 수정을 가능하게 한다. It is important to detect races for debugging shared-memoy parallel programs, because the races cause unintended nondeterministic program execution. Previous on-the-fly techniques to detect races can not guarantee the first race detection in nested parallel programs. Detecting the first race is important for debugging parallel programs, since the removal of the first race may make the next occurred races disappear. In this paper, we presents an on-the-fly detection technique to detect all of the first races through the reexecution of the debugged programs. We assume that the debugged parallel program may have one-way nested parallel programs. The number of reexecution is at the least the nesting depth of the program in the worst case. The space complexity is O(VT) and the time complexity to detect race in each access of access history is O(T), where V is number of shared variables and T is the maximum parallelism of the program. This efficiency of our technique in each execution is the same with the previous on-the-fly detection techniques. Therefore, this technique makes debugging parallel programs more effective and practical.
千炳圭 안성산업대학교 1985 論文集 Vol.17 No.-
가. MⅠ에서는 完全分解하는데 92分이 所要되었다. 分解時 자리의 바꿈이 MⅡ, MⅢ보다 많으므로 여기에서 몇 分의 時間이 지체되었다. 分解를 한 곳에서 完全히 處理 못하고 자리를 옮겨 分解하다가 다시 돌아오고 이런 反複的인 자리바꿈에서는 100%의 能率的인 分解組立을 할 수 없다. 나. MⅡ에서는 MⅠ보다 工具의 使用範圍를 넓히고 分解組立時 바뀌는 자리이동을 最大限으로 줄여 作業의 能率을 높였다. 다. 氣化器分解時 六角볼트로 固定되었기 때문에, 左則볼트를 푸는데 어렵지는 않지만 右則볼트는 가버너레버 및 덮개 때문에 볼트를 푸는데 나쁘다. 그러므로 氣化器에 使用되는 볼트를 spanner 및 driver 兼用으로 하였으면 좋겠다. 라. 위의 3가지 分解方法中 MⅡ가 가장 적당하다고 여겨진다. MⅠ은 分解時 자리의 位置바꿈이 많고 MⅢ과 MⅡ는 別差異가 없으나 큰 部品부터 分解하다가 작은 部品을 잃어 버리고 分解할 경우가 있다. This study was intended to develop the suitable maintenance method of power tiller engine. This results are summarized as follows; 1. Among the methods of removing parts from power tiller engine, model I (MI) required 92minutes. Compared to MII and MIII, MI needs more time due to wandering around the engine to take parts off. 2. In model II (MII), Technician can remove much more parts in a place than MI. 3. In removing and replacement parts, MII needed the least time among the 3 models and appeared to be a adequate method for engine maintenance.
Imaging Features of Hepatic Adenoma in a Dog with Atypical Computed Tomographic Findings
진한솔,천병규,이가현,박승조,이주환,최지혜 한국임상수의학회 2018 한국임상수의학회지 Vol.35 No.2
Computed tomography (CT) findings of hepatic adenoma in veterinary medicine are variable and unlikein human medicine, not defined clearly. A 12-year-old neutered male Shih Tzu presented after a seizure, with weightloss, salivation, and cachexia. An abdominal mass was identified on radiography, and ultrasonographic images showeda mixed echo pattern with marked vascularity. CT showed that the mass originated from caudate lobe, washeterogeneously hypoattenuated compared with the hepatic parenchyma, and had irregular margins. Contrast enhancedCT showed that the mass enhanced like the surrounding liver parenchyma. However, it contained unenhanced areasand enhanced vessels were observed in the arterial phase at the periphery of the mass. The margins of mass weremore enhanced in the venous phase than the arterial phase and the hypoattenuating regions within the mass werenot enhanced. Greater enhancing in the venous phase is seen with adenomas; however, the heterogeneous enhancementpattern, especially the marginal vascular enhancement and internal hypoattenuating regions, is seen with malignancy. Although this is a single case of hepatic adenoma, the atypical enhanced pattern of this case can provide usefulinformation to predict the malignancy of primary liver tumor.
이가현,전성훈,이상권,천병규,문소현,박준규,조경오,최지혜 대한수의학회 2017 Journal of Veterinary Science Vol.18 No.4
This study evaluated whether renal perfusion changes can be noninvasively estimated by using contrast-enhanced ultrasonography (CEUS) in renal ischemia-reperfusion injury and investigated the correlation between renal perfusion measured by CEUS and necrosis and apoptosis of renal tubular epithelial cells. In six dogs with experimentally induced renal ischemia-reperfusion injury, changes in time to peak intensity, peak intensity, and area under the curve were measured on CEUS. Peak intensity and area under the curve of the renal cortex began to decrease on day 1 (about 20% lower than baseline) and reached the lowest levels (about 50% of baseline) on day 4. They then gradually increased until day 10, at which time peak intensity was about 87% and area under the curve was about 95% of baseline; neither fully recovered. Both parameters were strongly correlated with the necrosis scores on histopathologic examination on day 4 (r = −0.810 of peak intensity and r = −0.886 of area under the curve). CEUS allowed quantitative evaluation of perfusion changes in acute renal ischemia-reperfusion injury, and CEUS results were correlated with renal tubular damage on histopathologic examination. Thus, CEUS could be a noninvasive, quantitative diagnostic method for determining progress of renal ischemia-reperfusion injury.