• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2000년도 춘계학술대회 발표논문집
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• pp.201-208
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• 2000

We are concerned in the estimation of lifetime distribution of a component having a few observed failure data and we demonstrate that we can use the maximum likelihood estimation utilizing the censored data when the number of components in use is quite large. Weibull distribution is assumed fur the lifetime and a simple estimation procedure is introduced. We also propose the method of determining the optimal number of spares required for a specified period without introducing cost functions. The proposed methods are applied to the photon stop and the water-cooled flange which are major components in Pohang Light Source.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 춘계학술대회논문집
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• pp.353-356
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• 2003

Acoustic holography is adopted in identifying the noise sources of a vehicle's underbody. Wind noise from a vehicle's underbody accounts for a large portion of the overall noise level due to the complex flow structure. Current study presents the development process of acoustic holography in the vehicle underbody, and discusses the results obtained using the method. Difficulties associated with using acoustic holography as well as the implication of the results regarding future noise reduction possibilities are discussed.

• 전기화학회지
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• 제5권4호
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• pp.189-191
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• 2002

Reversible trans-cis isomerization of meta-bipyridylazobenzene coordinated to cobalt was achieved by a combination of photoirradiation with a single UV light source and a Co(II)/Co(III) redox reaction. The trans/cis conversion performance was significantly improved in the meta-form compared with the meta-form ligated to cobalt.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.933-936
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• 2007

An inductively coupled plasma source with internaltype linear inductive antennas named as "multiple Utype antenna" was developed for the substrate size of $2,300mm\;{\times}\;2,000mm$. High density plasmas on the order of $1.18\;{\times}\;10^{11}\;cm^{-3}$ could be obtained and the RF power of 8kW with good plasma stability.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2013년도 전력전자학술대회 논문집
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• pp.382-383
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• 2013

본 논문에서는 대용량 3상 전류형인버터의 효율향상을 위해 스위칭손실을 저감시킬 수 있는 3단계 스위칭시퀀스 기반 SVPWM 제어기법을 제안하고, 기존 SPWM 혹은 SVPWM 제어기법과 비교/검토하여 시뮬레이션 해석을 통해 유효성을 검증한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(5)
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• pp.249-252
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• 2001

A large number of soft switching topologies included a resonant circuit have been proposed. But these circuits increase number of switch in circuit and complicate sequence of switching operation. In this Paper, the authors propose power conversion system, DC-AC inverter of high efficiency and high power factor with soft switching mode by partial resonant method. The result is that the switching loss is very low and the efficiency of system is high. And the snubber condenser used in partial resonant circuit makes charging energy regenerated at input power source for resonant operation.

• 스마트미디어저널
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• 제4권3호
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• pp.62-67
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• 2015

The trend keywords in ICT sector will be Big Data, Internet of Things, and Cloud Computing. The rear end to support those techniques requires a large-capacity storage technology of low-cost. Therefore, we proposed the prototype of low-cost and mass distributed storage system based on PC using open-source Ceph FS for SMB.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2003년도 학술대회논문집
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• pp.15-18
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• 2003

무전극 형광램프는 발광하는 부분의 사이즈가 크고 광원의 특성상 점광원으로 볼 수 없기 때문에 효율적인 광학기구를 설계하기 어렵다. 특히 반사판 설계시 반사광이 램프로 재흡수 되는 것을 고려하여야 한다. 본 논문은 무전극 형광램프에 대하여 반사광이 램프로 재흡수 되는 것을 막고 효율을 높이며 목표배광에 맞출 수 있는 2차원 축대칭형 반사판 설계법을 제시하였다. 그리고 이 설계법의 문제점과 해결방법에 대하여 고찰하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2015년도 전력전자학술대회 논문집
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• pp.103-104
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• 2015

Solar energy has proven to be a potential clean energy source to help offset the large consumption of fossil. Nowadays, many research projects aim to enhance photovoltaic (PV) system performance and functionality. This research focuses on integrating self-monitor capability into dc-dc converters that control PV panels to detect a fault in series-connected PV cells, called hot spotting. A detection method using ac parameter characterization is proposed and its operation is examined through simulation.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 추계학술대회논문집 II
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• pp.628-632
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• 2001

In this paper, Firstly, it is shown that the bending mode vibration source of vertical pump system is comparatively large because resonance. Secondly in order to the bending mode vibration of vertical pump some practical dynamic absorber have been developed and its effectiveness is investigated as installing it at the vertical pump system practically.