• Proceedings of the Korea Air Pollution Research Association Conference
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• 2007.10a
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• pp.490-491
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• 2007

• The Transactions of the Korea Information Processing Society
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• v.5 no.10
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• pp.2641-2653
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• 1998

• Proceedings of the Korean Magnestics Society Conference
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• 2011.06a
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• pp.166-166
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• 2011

• 대한생식의학회:학술대회논문집
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• 2001.06a
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• pp.43-44
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• 2001

• 대한생식의학회:학술대회논문집
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• 2003.12a
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• pp.83-84
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• 2003

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.170-170
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• 2017

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2259-2261
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• 2003

본 연구에서는 전원선로의 정전시나 입력 전원에 이상 상태가 발생했을 때 정상적인 전원을 컴퓨터에 공급하는 Power Supply 내장용 무정전 전원장치(Uninterruptible Power System : UPS)의 개발하였다. 본 연구에서 개발한 내장형 무정전 전원장치는 마이컴(PIC16C74A)을 이용하여 컴퓨터 Power Supply 내부에 장착하였으며, 사용자가 편리하도록 하기 위해서 내장형 무정전 전원장치의 그래픽 사용자 인터페이스를 구현하였다.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2005.11a
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• pp.255-258
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• 2005

A blind-mode integer frequency offset estimation algorithm is proposed for an OFDM system. Imperfect integer frequency offset estimation causes ambiguity in the data sub-carrier position. Morelli's blind integer frequency offiet estimation algorithm exploits the likelihood function by comparing the power in sub-carriers. It, however, shows performance degradation when there is the fractional frequency offset. The proposed algorithm solves this by using interpolation in the frequency domain. In this algorithm, it is exploited that the effect of the frequency offset is shown as a shift of power spectrum. By calculating the covariance of over-sampled samples, most approximate samples to integer point are obtained. It enables integer frequency offset estimation less affected by fractional frequency offset.

• Journal of the Korean Society for Precision Engineering
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• v.5 no.4
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• pp.39-47
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• 1988

There are many methods in measuring the signal of cutting, but by measuring the multi-signal, we can pick up the wear and chipping of the tool more accurately. Hence, the present study is concerned with analysing the dynamic component as well as the static component measured by the tool dynamometer, finding out which signal is involved in each component, comparing the capability of the cemented carbide drill and the HSS drill, and discussing the chipping of the cemented carbide drill. In addition, discussion is made about the characteristics of the frequency of the torque and thrust in connection with the dynamic component.

• Proceedings of the KIEE Conference
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• 1998.07e
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• pp.1746-1748
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• 1998

In this paper, the relation between the increment of metallic content such as copper(Cu) and iron(Fe) according to degradation of pole-transformer oil and change of electrical characteristics according to increment of metallic content was studied. As the result, electrical characteristics was decrease according to increment of metallic content, especially copper content, and the trend of T.C.G(Total Carbonic Gas) agreed with the trend of copper content.