통합 검색 | Korea Science

김길상;김정부;정상진
- 대한전기학회:학술대회논문집
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- 대한전기학회 1989년도 하계종합학술대회 논문집
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- pp.411-414
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- 1989
It is well known that switching overvoltages in the electric power system can damage electric power apparatus. To investigate switching overvoltages, electric power system has been modeled using mathematical equal ions. Using developed model, switching overvoltages in the transformer terminal have been computed and analysed.
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김창수;이창호;진병문
- 대한전기학회:학술대회논문집
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- 대한전기학회 2002년도 하계학술대회 논문집 A
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- pp.395-397
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- 2002
Recently, electric heating using midnight power has brought a rapid increase. Therefore, the increase of midnight power use has much influenced on midnight load pattern and share more than 20% of total midnight electricity consumption. Hence, the distortion of load by using midnight power apparatus is severe and made the usage pattern ineffective electricity usage pattern. This paper analyze the load pattern of midnight power apparatus and policies that can effectively build midnight load. In addition, it provides policies on shifting midnight power apparatus load.
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정지현;지상원;장지성
- 동력기계공학회지
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- 제11권3호
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- pp.59-65
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- 2007
In this study, 6-DOF simulator using pneumatic cylinder driving apparatus was manufactured because a pneumatic cylinder driving apparatus is superior to electric driving motor and hydraulic actuator, which used in traditional 6-DOF simulator, in competitive price and acceleration performance, and, 6-DOF motion can be realized at a low price in case that relatively low load is imposed on the simulator. The possible range of pose control of the simulator was investigated by inverse kinematics, and, it was controlled by a linear controller derived from linear model of the simulator. The Experimental results show that the simulator follows given coordinate well.
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최남호;구경완;이명섭;한상옥;정재기;조성배
- 한국전기전자재료학회:학술대회논문집
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- 한국전기전자재료학회 1999년도 추계학술대회 논문집
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- pp.187-190
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- 1999
To reduce the maintenance expence, and the possibility of electric outage and accident, accurate measurement should be carried. But the classical method has some problems in the aspect of man power, reliability, and expence. In this paper, we propose a new type apparatus, which could detect the degree of contamination on insulators on outdoor insulation system, such as transmission and distribution line insulator and bushing. The new type apparatus consists of Pelltier module, electrode system, and measuring part. At first leakage current detecting method was considered, then with the fault(oxidation of electrode) of that method we should propose a another method. We carried various test to prove the possiblity and reliability of the propoused apparatus. And we get some useful result with laboratory test.
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Min, Byung-Chan;Chung, S.C.;Min, S.W.;Kim, S.K.;Park, S.J.;Kim, C.J.;Shin, J.S.;Kim, J.S.;Lee, D.H.;Sakamoto, K.
- 산업경영시스템학회지
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- 제22권53호
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- pp.69-78
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- 1999
We developed an apparatus for odorous stimuli control to record olfactory evoked potentials from human scalp. The characteristics of the apparatus were as follows. 1. Translating the subjects respiration into electric signals with a sensor attached to the nose. The period and timing of odorous stimuli could be adjusted, so that stimuli could be synchronous with respiration. 2. The respirations translated into electric signals were made constant in amplitude by using an auto gain control circuit. 3. The interstimulus interval of odorous could be arbitrarily selected once every 1 to 9 respirations so that adaptation could be prevented. We obtained olfactory - evoked potentials (OEPs) to odorous stimuli using this apparatus from the site of Cz, whose positive peak latencies were approximately $180{\pm}23ms$. Such response were not recorded if oxygen stimuli were used instead of odorous or with click sounds produced by the switching electromagnetic valve.
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