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盧壹守(Il-Soo Rho),姜大夏(Dae-Ha Kang) 대한전기학회 2007 전기학회논문지 Vol.56 No.12
In this study a low-signal equivalent circuit based on the Double Schottky Barrier model is proposed for ZnO-based varistor. Since pin-lead inductance and stray capacitance are considered in pin-lead type ZnO varistor these inductance and capacitance could be removed from the experimental dielectric data of the varistor. According to the equivalent circuit simulation results the higher the varistor-voltage of varistor sample the capacitance of dielectric layer is larger, and the capacitances of semiconducting layer and depletion layer are smaller, while the parallel resistances of semiconducting layer and depletion layer are more larger values. Spectra of the dielectric loss factor tanδ show 2 peaks in low frequency and high frequency regions respectively. The low-frequency peak is due to the relaxation by deep donors and the high-frequency peak is due to the relaxation by shallow donors. Above results are well consistent with the theoretical mechanism of ZnO varistor.
강대하(Dae-Ha Kang),박상호(Sang-Ho Park),노일수(Il-Soo Rho),최필수(Phil-Soo Choi),심재구(Jae-Gu Sim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
In this study dielectric and piezoelectric properties of fluoro-rubber/PZT composite were measured and analyzed by composite's laws. As the results the Rayleigh's equation was well consistent with experimental results qualitatively and the Bruggeman's equation was more well consistent with the experimental results for volume fraction of PZT quantitatively.
강대하(Dae Ha Kang),이재훈(Jae Hoon Lee),노일수(Il Soo Rho),박상호(Sang Ho Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In this paper dielectric and piezoelectric properties were measured for 2 phase - dispersed composite system consisting of ferroelectric ceramic PZTparticles and polymer PVC. The results were analyzed and the validity of composite theories for experimental results were discussed. And also in high temperature where ionic conductivity is dominated, linear and nonlinear permittivites were measured and discussed.
강대하(Dae-Ha Kang),박상호(Sang-Ho Park),박윤동(Yun-Dong Park),최필수(Phil-Soo Choi),노일수(Il-Soo Rho) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
From dielectric constants and conductivities obtained by experiments mol-conductivities and segmental-mode relaxation frequencies were analyzed. As a result it was found that above two parameters have relation of a proportional ratio 1.