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이학인(Hak-in Lee),유승열(Seong-yeol Yoo),이지은(Ji-eun Lee),노명규(Myoungyu Noh) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
We have designed a micro flywheel energy storage system in which the flywheel stores the electrical energy in terms of the kinetic energy and converts this kinetic energy into the electrical energy when necessary. The flywheel is supported by two radial permanent magnet passive bearings. Permanent magnet passive bearings use the repulsive forces between two sets of permanent magnets so that contact free rotation is possible. The toroidally-wound BLDC motor which has high efficiency and little additional negative radial stiffness is used for motoring and generation. Micro flywheel energy storage system is optimally designed to have the maximum energy storage capacity. In this paper, we present the design process of the micro flywheel energy storage system.
조은경(Eun Kyung Cho),최은수(Eun Soo Choi),박현진(Hyun Jin Park),김용태(Yong Tae Kim),김용준(Yong Joon Kim),이상민(Sang Min Lee),이홍순(Hong Soon Lee),김병열(Byung Yul Kim),유수웅(Soo Woong Yoo),이학중(Hak Choong Lee) 대한내과학회 1993 대한내과학회지 Vol.45 No.3
Background: Since initial treatment for complete heart block with external transvenous pacemaker by Zoll in 1952, the frequency of the use for cardic pacing has increased considerably and the indications for long term pacing have greatly extended according to the development of smaller and multiprogrammable pacemakers. Complications related to cardic pacemaker have also been diversified. Method: To examine complications related to them, we studied 59 implantations of permanent pacemaker from January 1986 to October 1992 at National Medical Center. Results: 1n this study we experienced 16 cases (27.1%) of complications for cardiac pacing in 59 implantations of permenent pacemaker. They included two cases (12.5%) of pacing failure, two cases (12.5%) of undersensing of wide QRS wave, one ease (6.3%) of undersensing of APC, one case (6.3%) of dislodgement, three cases (18.8%) of oversensing, two cases (12.5%) of pacemaker induced CHF, three cases (18.8%) of competition and two cases (12.5%) of wound infection. Conclusion: With more frequent use of permanent pacemaker, it is thought that the development of ideal pacemaker is required.
관동맥조영동안 심전도변화와 QT 간격 증가의 임상적 의의
이범우(Bum Woo Lee),성상규(Sang Kyu Sung),이은주(Eun Joo Lee),장대환(Dae Hwan Jang),이홍순(Hong Soon Lee),이학중(Hak Choong Lee) 대한내과학회 1988 대한내과학회지 Vol.34 No.3
N/A We studied the electrocardiographic changes which were induced by injection of radiopaque contrast media during selective coronary angiography in 16 patients with chest pain. Electrocardiograms were obtained before, during and after selective coronary angiography. Electrocardiographic changes were a according to kinds and numbers of diseased coronary vessels. After selective coronary angiography, electrocardiographic finding showed more frequent changes of T wave than those of S-T segment in 12-standard lead. And there was no difference of electrocardiographic changes between normal groups and abnormal groups of coronary angiograhic finding. During coronary angiography, prolongation of Q-T interval was initiated about 4 sec after contrast media was injected into coronary artery and persisted for 8 see nearly. Also Q-T interval was significantly prolonged during coronary angiography when was compared with precoronary angiography (p<0.01). We concluded that changes of T wave were more prominent and prolongation of Q-T interval could be warning sign of ventricular fibrillation.