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이상익(S.I Lee),유재근(J.G Yoo),전정채(J.C Jeon),전현재(H.J Jeon),허혜성(H.S Heo),최규하(G.H Choe) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
Recently the harmonic generation has deteriorated the quality of electricity and affected the performance on the electrical installation including personal computer, fax, community devices and so on. Some studies of harmonic affects in diagnosis and the cause of accident has not done by the experimental data of harmonic source but merely by presumption according to qualitative analysis. So, in order to research the harmonic affect on the electrical installation according to quantitative analysis and gather reliable data over and over again, it is necessary to develop an Harmonic power source which is capable of generating some harmonics. In this paper, we described about realization of Harmonic power source control module which can produce and added harmonics for the analysis due to harmonic effects.
이상익(S.I Lee),유재근(J.G Yoo),전정채(J.C Jeon),전현재(H.J Jeon),허혜성(H.S Heo),최규하(G.H Choe) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
This paper presented a actual conditions on a false-tripping of ELB(Earth Leakage Breakers) and an assessment of the harmonics due to non-linear electronic equipment such as personal computers, rectifier, electric furnace and test equipments in plant installations. Actual conditions on a failure of ELB were surveyed and analyzed by making up a question to safety managers of plant installations. Also, power quality measurements such as harmonic currents, voltage and current waveform and current imbalance were made at various plant installations where nuisance tripping of ELB is often occurred. The results of this study can be used in making decisions regarding cause of ELB trip and operating and tripping characteristics test of ELB when subjected to distorted current waveform.
다채널 전극을 이용한 초음파 자극 시 쥐 해마 신경 세포의 활동 전위 검출
한희석,전현재,황서영,이예나,변경민,전상범,김태성,Han, H.S.,Jeon, H.J.,Hwang, S.Y.,Lee, Y.N.,Byun, K.M.,Jun, S.B.,Kim, T.S. 대한의용생체공학회 2013 의공학회지 Vol.34 No.4
It is known that ultrasound affects action potentials in neurons, but the underlying principles of ultrasonic neural stimulation are not clearly elucidated yet. In this study, we measured the action potentials of rat hippocampal neurons cultured on multi-electrode arrays during ultrasound stimulation. From most of electrodes, it was observed that the ultrasound stimulation increased the frequencies of action potentials (i.e., spikes) during ultrasound stimulation.
이상익(S.I Lee),전현재(H.J Jeon),김기현(G.H. Kim),배석명(S.M. Bae) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
전기설비에서 전기안전을 확보하기 위해 전기설비의 전압, 전류, 절연저항, 누설전류 등을 직접 측정하고 관리하려면 시간과 비용이 많이 소요된다. 최근 전력 IT기술들의 발전과 활용이 증가하고 있는데 이러한 기술들을 전기설비 전기안전 관리에 적용할 경우 운영 및 유지보수의 효율성과 전기안전을 확보할 수 있다. 따라서 전기설비의 효율적인 관리와 전기안전을 확보하기 위한 전력 IT 기반 전기안전감시시스템을 설계하여 활용하고자 한다.