• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.727-729
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• 2005

본 논문에서는 낙뢰에서 발생하는 VHF 대역의 신호를 광대역 간섭계를 통하여 낙뢰의 방전경고 측정하는 거리 낙뢰관측 시스템을 소개하고자 한다. 측정시스템은 3개의 광대역 전계센서와 LF/VLF 대역의 전계센서로 구성된다. 측정된 신호는 잡음 제거를 위한 필터를 거쳐 디지털 신호로 변환되어 메모리에 저장되어 진다. 각각의 센서로부터 측정된 신호는 FFT분석을 거쳐 신호원인 낙뢰의 방위각과 고도각이 계산되어진다. 이 시스템은 30 km 내외의 뇌운의 방전 경로의 형성과 진전과정을 세밀하게 관측할 수 있다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2007.11a
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• pp.175-176
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• 2007

• 한국초전도학회:학술대회논문집
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• 2008.08a
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• pp.36-36
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• 2008

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.06a
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• pp.791-792
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• 2008

• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.126-127
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• 2019

• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.22-24
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• 2019

• Proceedings of the KIPE Conference
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• 2018.11a
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• pp.209-210
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• 2018

• Transactions of the Korean Society of Automotive Engineers
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• v.2 no.5
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• pp.121-134
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• 1994

Shock tube investigation of ethylene oxide-$0_{2}-N_{2}$ mixture have been performed to reveal detonation characteristics of the mixture in terms of detonation pressure and speed. Theoretical calculation of thermodynamic parameters at the Chapmann-Jouguet detonation of the mixture has been also performed. A comparision of the observed results with the calculated ones can lead us to predict the detonation parameters of ethylene oxide in an artificial air. In addition, we have observed ignition delay times of ethylene oxide mixtures. The best fit of the observed delay times to Arrhenius gas kinetic relation gives : ${\tau}=10^{-144}{e{xp}}(E_a/RT)[C_{2}H_{4}O]^{-4.8}[O_{2}]^{-12.4}[N_{2}]^{-14.1}$ $E_a=3.67kcal/mole$ The observed activation energy is markedly reduced, compared with the case of ethylene oxide diluted in Ar. It could be due to the factor that $N_2$ play a role as detonation promoter yielding very reactive NOx radicals.

• Proceedings of the KIEE Conference
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• 2000.11a
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• pp.122-124
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• 2000

This study is focused on developing a program which can edit different formats of power system data used by system operators PSS/E program, which has been widely used as a tool for power system analysis. Provides only a limited function of editing PSS/E input data. Considering that more and more power system analysers will be developed and applied for power system planning and operation in the near future, unified handling of multi-types of power system data format, such as conversion of one input data format into another, is indispensible. In this paper, a new power system data editor, functionally augmented from PSS/E editor, is introduced. The new editing program was developed in GUI environment for users to conveniently edit input data for EUROSTAG program without running several editors. Considerable savings in time and manpower are expected.

• Journal of Applied Reliability
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• v.13 no.2
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• pp.117-127
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• 2013

In this paper, we studied the correlation between the activation energy($E_a$) of the raw materials and the structural characteristics of the White LED PKGs. The samples used in the study were composed of low power LED 3type and high power LED 5type. To calculate the activation energy($E_a$) of the White LED PKGs conducted three conditions of high temperature operation test based on the Arrhenius model. The number of samples used in the experiment is 10, respectively. The $T_j$ of Conditions and target specifics expressed $T_{j1}$, $T_{j2}$, $T_{j3}$. The activation energy ($E_a$) of the samples was calculated based on the value of the actually measured lifetime. We investigated the correlation between the activation energy ($E_a$) of the raw materials and the structural characteristics of the White LED PKGs. As a result, White LED PKGs activation energy($E_a$) value was confirmed that the material properties affected more than the structural characteristics of the LED PKGs and we found that activation energy of each LED Model has difference. Normally, The activation energy of phosphor of YAG type was indicated from 0.21 to 0.25[eV] and Silicate type was indicated from 0.12 to 0.16[eV]. According to the results, we confirmed that the activation energy of phosphor of YAG type is higher more than The activation energy of phosphor of Silicate type.