• Proceedings of the Optical Society of Korea Conference
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• 1990.02a
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• pp.29-33
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• 1990

Efficient numerical method is developed for treating electromagnetic problems of scattering and radiation from surfaces. Special consideration is given to the treatment of edges so that rather arbitrary geometrical configurations may be handled. For the conducting body problems considered, an electric field integral formulation is used, and the method of moments is applied using pulse expantions to present currents. Numerial results indicate that the approach is free os anomalies in the behavior of current for body of revoution.

• Journal of electromagnetic engineering and science
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• v.3 no.1
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• pp.67-71
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• 2003

In this paper, frequency modulated(FM) reflectometry is proposed to measure group velocity of microwave transmission line Various microwave transmission lines such as periodically loaded conducting posts in a waveguide and nonradiative dielectric(NRD) guide are adopted to measure their group velocity The result compared with that from network analyzer shows good agreement, indicating the validity of our measurement method.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.4 no.3
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• pp.209-213
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• 2003

Polyaniline (PANi) composite particles were synthesized by chemical oxidation polymerization of aniline in presence of poly-n-isopropyl acryl amide (PNIPAM). The PANi particles formed in the reaction medium deposited onto non-conducting PNIPAM template to produce PANi-coated composite particles. The formation of composite was confirmed by FT-IR spectroscopy, and UV-VIS spectroscopy, and their morphological structures were examined by scanning electron microscopy (SEM). From the experimental results, it was determined that PANi was successfully coated onto non-conducting PNIPAM.

• Proceedings of the KIEE Conference
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• 2003.10a
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• pp.82-85
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• 2003

In this paper, we present the analysis of electromagnetic scattering from arbitrarily shaped three-dimensional conducting objects coated with a dielectric material. The integral equation treated here is the combined field integral equation. Numerical results of radar cross section for coated conducting structure are presented and compared with other available solutions.

• Proceedings of the Materials Research Society of Korea Conference
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• 2007.11a
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• pp.43.2-43.2
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• 2007

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 1999.02a
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• pp.1-6
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• 1999

The recent progress in the new cooling technology for superconducting systems without liquid cryogens is briefly presented. In these conduction-cooled systems, the super-conducting magnets are cooled by a direct contact with closed-cycle cryocoolers and only electricity is supplied to maintain the cryogenic temperatures. It is reported that at least 20 conduction-cooled (low Tc or high Tc) super- conducting systems have been constructed, tested, or commercially used worldwide. Some of the significant design issues are discussed in comparison with the conventional liquid-helium cooled systems.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.6
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• pp.807-814
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• 1999

In this paper, it is shown that high frequency current can be controlled to concentrate near the desired path in a conducting plate. A conducting plate is modelled to examine current distribution. And current distribution is analyzed in view of the frequency and geometric characteristics of current path. The high frequency current behavior from the analysis is compared with the experiments. The results, obtained by the experiments of test specimens, are in good agreement with the analytical results.

• Journal of electromagnetic engineering and science
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• v.1 no.2
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• pp.173-175
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• 2001

A polarizability fur a circular aperture near a conducting plane is derived. The Mantel-transform and mode-matching is used to obtain a simple series solution. The presented series solution is fast convergent so that it is very efficient fur numerical computations.

• Proceedings of the Korean Fiber Society Conference
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• 1998.10a
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• pp.232-235
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• 1998

ion conducting polymers have been extensively investigated because of their potential application as an electrolyte in solid state batteries [1]. Among the polymer electrolytes, solid polymer electrolytes (SPEs) composed of ion conducting polymer and alkali metal salt have many advantages such as high ionic conductivity, high energy density and light weight. This made them suitable replacement for liquid electrolytes. (omitted)

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.822-824
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• 2002

Transparent conducting ZnO:$Ga_2O_3$ thin films were deposited on glass substrates using rf magnetron sputtering method. The ZnO:$Ga_2O_3$ thin films were highly c-axis oriented normal to the substrates and had smooth surface features. The sheet resistance of the films was 2.8-6.4 ${\Omega}/{\square}$ at the growth temperature ranging from 25 to 30$^{\circ}C$.