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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.
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.
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.
Park, Gwi Ok,Yoon, Jeongbae,Park, Eunjun,Park, Su Bin,Kim, Hyunchul,Kim, Kyoung Ho,Jin, Xing,Shin, Tae Joo,Kim, Hansu,Yoon, Won-Sub,Kim, Ji Man American Chemical Society 2015 ACS NANO Vol.9 No.5
<P>To monitor dynamic volume changes of electrode materials during electrochemical lithium storage and removal process is of utmost importance for developing high performance lithium storage materials. We herein report an <I>in operando</I> probing of mesoscopic structural changes in ordered mesoporous electrode materials during cycling with synchrotron-based small angel X-ray scattering (SAXS) technique. <I>In operando</I> SAXS studies combined with electrochemical and other physical characterizations straightforwardly show how porous electrode materials underwent volume changes during the whole process of charge and discharge, with respect to their own reaction mechanism with lithium. This comprehensive information on the pore dynamics as well as volume changes of the electrode materials will not only be critical in further understanding of lithium ion storage reaction mechanism of materials, but also enable the innovative design of high performance nanostructured materials for next generation batteries.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-5/acsnano.5b01378/production/images/medium/nn-2015-013783_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b01378'>ACS Electronic Supporting Info</A></P>