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급성 지주막하 출혈에 동반된 관상동맥 연축에 의한 심근경색증 1예
부귀범,박근호,양종태,이동민,장성종,김건영,장경식 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.1
In many cases, acute cerebrovascular disease is accompanied by abnormal electocardiograms. Also, though rather uncommon, acute myocardial infraction is also seen. The mechanism of its occurance is uncertain but it is thought to be related to coronary artery spasms, an abnormal autonomic nervous system, and a catecholamine increase. A female patient of 34 years of age came to the hospital because of sudden headache accompanied by substernal chest pain. A subarachnoid hemorrhage due to a cerebral aneurysm rupture had occured, and there was ST segment elevation in lead II, III, and aVF of the electrocardiogram. A cardiac enzyme test, an echocardiography, and a coronary angiography were performed, and she was diagnosed to have acute myocardial infarction due to coronary artery spasm. Clipping of the aneurysm was performed. With the use of nitrate and an angiotension converting enzyme inhibitor, the condition of the patient improved.
볼트 결합부 풀림에 관한 마찰 특성 : 제Ⅰ보 : 나사 마찰 실험 Ⅰ : Thread Friction Experiments
박태원,신귀수,Jiang, Yanyao,Zhang, Ming 한국안전학회 2003 한국안전학회지 Vol.18 No.2
By using an approach developed to determine the torque-tension relationship for bolted joints, frictional properties of several typical bolted joints were studied experimentally. The specific property by bolted joints certify that the most significant influence of materials and bearing surface condition. Experiments on thread friction shows that prevailing torque nuts with distorted threads provide benefit for preventing self-loosening of the nut. Repeated tightening-loosening generally increases frictions in a bolted joint. It was noted that the data scatter of the experimental results of frictions in a bolted joint may overshadow the influence of size. speed, and contact positions. The results from the experimental investigation will help to better design bolted joints.
볼트 결합부 풀림에 관한 마찰 특성 : 제Ⅱ보 : 너트-와셔 지지 마찰 실험 Ⅱ, Nut - Washer Bearing Friction Experiments
박태원,신귀수,Jiang, Yanyao 한국안전학회 2004 한국안전학회지 Vol.19 No.1
By using an experimental approach recently developed to determine the torque-tension relationship for bearing frictional characteristics of several typical bolted joints were studied The experimental approach allows the direct determination of the bearing friction between the nut and its bearing surface. Detailed friction studies were made on the influences of the size and shape of the hole, the use of a slot in a bolted joint, contact area and position, and other factors such as turning speed, coating, and the use of wax on the bearing surface. The contact area and position of the washer have a marginal effect on the bearing friction. The organic coating on the nuts reduces the bearing friction significantly. Nuts with organic coating over a washer with zinc finish provide the smallest and the most consistent bearing friction. The results from the experimental investigation will be helpful for the better design of bolted joints.
裵相旭,朴太洪,朴貴泰 慶一大學校 1997 論文集 Vol.14 No.2
This paper presents a design method of fuzzy logic controller(FLC). In the proposed method, the parameters of FLC are determined by using Genetic Algorithms(GAs), which is an optimizing algorithm. Two types of FLC are considered. One is FLC with control rules whose fuzzy variables are all assigned by linguistic quantity. The other is FLC with control rules which are inferenced with simplified reasoning. For each FLC, the method of applying the GAs to determine the parameters of the FLC is proposed. By the simulation study for four systems with different characteristic, the usefulness of the proposed design scheme is discussed.
Vision Based Self-Planning System of a Humanoid Robot for Obstacle Avoidance
Tae-Koo Kang,Gwi-Tae Park 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
This paper addresses the vision based path planning. To handle the obstacles which exist beyond the field of view(FOV), this paper uses the 3d panoramic image Moreover, to decide the avoidance direction and walking motion of a humanoid robot for the obstacle avoidance by itself, we propose the vision based path planning using 3d panoramic image. In the vision based path planning, the path and walking motion are decided under environment condition such as the size of obstacle and available space to avoid obstacles. The vision based path planning is applied to a humanoid robot, URIA. The results from these evaluations show that the proposed method can be effectively applied to decide the avoidance direction and the walking motion of a practical humanoid robot.
3D Vision-Based Local Path Planning System of a Humanoid Robot for Obstacle Avoidance
Tae-Koo Kang,Myo-Taeg Lim,Gwi-Tae Park,Dong W. Kim 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.4
This paper addresses the vision based local path planning system for obstacle avoidance. To handle the obstacles which exist beyond the field of view (FOV), we propose a Panoramic Environment Map (PEM) using the MDGHM-SIFT algorithm. Moreover, we propose a Complexity Measure (CM) and Fuzzy logic-based Avoidance Motion Selection (FAMS) system to enable a humanoid robot to automatically decide its own direction and walking motion when avoiding an obstacle. The CM provides automation in deciding the direction of avoidance, whereas the FAMS system chooses the avoidance path and walking motion, based on environment conditions such as the size of the obstacle and the available space around it. The proposed system was applied to a humanoid robot that we designed. The results of the experiment show that the proposed method can be effectively applied to decide the avoidance direction and the walking motion of a humanoid robot.