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李準雄 光云大學校 1976 論文集 Vol.5 No.-
The lower dielectric constant obtainable with foamed insulation of FEP resin varies directly with void content. In order to decrease the dielectric constant of Fluorinated Ethylene Propylene (FEP) resin has made use of foaming specimens. As the results of the study, the logarithm of the dielectric constant decrease linearly from 2.1 of pure FEP resin to 1.52 or less, and at 1 mega Hertz, dielectric loss tangent is also observed about ????? order, so it is very suitable for high frequency insulation cable. The volume resistivity ????? ��m was obtained.
$TiO_2$ 첨가에 따른 ZnO 바리스터의 미세구조의 변화
이준웅,이상석,박춘배,이계호,박용필 한국전기전자재료학회 1990 電氣電子材料學會誌 Vol.3 No.1
본 논문에서는 TiO$_{2}$첨가함량이 ZnO바리스터의 미세구조에 미치는 영양에 대해 검토하였다. 실험결과, TiO$_{2}$ 첨가함량이 증가함에 따라 ZnO 결정립의 평균크기는 점차적으로 감소하였으며 스피넬상은 증가하였다. 그리고 TiO$_{2}$ 첨가에 의해 ZnO 결정립은 불균일하게 이상형으로 거대 성장되었으며 첨가함량 증가에 따라 거래 성장된 결정립의 크기도 증가하였다. 또한 TiO$_{2}$ 첨가함량 증가에 따라 파괴전압이 저하하였으며 이는 ZnO 입자의 평균크기가 증가하기 때문인 것을 확인할 수 있었다.
폴리플로필렌 필름의 열노화에 의한 유전완화현상에 관한 연구
이준웅,김용주,이상석 한국전기전자재료학회 1988 電氣電子材料學會誌 Vol.1 No.1
This paper was a study on dielectric phenomena of the specimen, Polypropylene films which were annealled in air and quenched in liquid nitrogen after aging for 5[hr] in water of 100[.deg.C]. The specimen was measured in temperature range of 15-120[.deg.C] and in frequency range of 30-1x 10$^{6}$ [HZ]. As the results of the study, it was confirmed that the tacticity of specimen was isotactic structure, and the degree of cryatallinity of the specimens calculated by means of Natta's method from XRD (X-ray Diffraction) spectrum was 55[%]. And for dielectric relaxation, .betha. peak-the tan .delta. (spectrum around 20[.deg.C])-attributed due to amorphous regions, and .alpha. peak - the tan .delta. spectrum around 90[.deg.C]-due to crystalline regions. It was identified that the degree of crystallinity of the specimen quenched in the liquid nitrogen was increased to 55-65[%], and that of the specimen annealled in the air was decreased to 55-50[%]. And activation energy from dielectric loss spectra was obtained 34.5[kcal/mole] for .alpha. peak and 80.5[kcal/mole] for .betha. peak, respectively.
李準雄 光云大學校 1974 論文集 Vol.3 No.-
Insulation paper are largely used in the insulation of the electric apparatus. In this experiment have been done on the current and voltage characteristics and the relation between relative humidity and dielectric strength before breakdown occurs. Experimental results slows that diminishing the insulation resistance, increasing tan δand decreasing dielectric strength of paper due to moisture content.
低密度 폴리에틸렌 일렉트렛트의 熱刺 激電流 解析에 關한 硏究
李準雄 光云大學校 1983 論文集 Vol.12 No.-
The thermostimulated discharge currents of low-density polyethylene electrets were measured versus the principal experimental variables. Several electrode types were used for the charging and discharging procedures. The results led to know the experimental conditions for the hetero-charge and homocharge accumulating and decreasing. The electronic structure parameters of polyethylene such as trap level, density of traps, hopping length, mobility, trap time constants were deduced. A method for evaluating the local electric field inside the electret is proposed.