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한충규 한국군사과학기술학회 2002 한국군사과학기술학회지 Vol.5 No.4
A chamber enduring 3,000 bars and an electrical high voltage power system have been designed and installed for studying the characteristics of the plasma produced in electro-thermal chemical propulsion system. In order to test the structural characteristics, polyethylene injectors were used which have 4 or 6 mm inner diameter and several lengths from 15 to 70 mm. The capacitors were charged at the voltages of 5.2, 7.3 and 10.4 kV which correspond to 5.58, 11 and 22.3 kJ in charging energy. The observed resistivities of the plasma injector are close to those predicted by a theoretical model that describes the plasma resistivity according to high current density.
고영호,김광주,한충규,Cedomir Petrovic,Rongwei Hu,이현희,이용재 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.3
X-ray diffraction patterns of ε-FeSi have been measured at pressures up to ~53 GPa with good signal-to-noise ratio and high resolution by using synchrotron radiation. In order to refine the crystal structure, a Rietveld analysis has been performed. The structure of ε-FeSi is cubic with space group P213 and a = 4.4781 ± 0.0026 °A. A third-order Birch-Murnaghan equation of state fit to the experimental data yields V0 = 89.80 ± 0.15 °A3, with a B0 of 204.7 ± 4.9 GPa and B'0= 5.6 ± 0.3. The bulk modulus obtained from this study is not only in very good agreement with those of some previous experimental studies but also in good agreement with those obtained from first-principles calculations.
김선철,최윤수,한충규,조경호,김형원,Kim, Sun-Cheol,Choi, Yoon-Soo,Han, Chung-Kyu,Cho, Kyung-Ho,Kim, Hyoung-Won 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.6
A high power laser beam focused on a small area accelerates a thin material that flies and hits other target material in which a shock wave may be induced. This laser induced shock experimental method is more repeatable and cheaper but worse than other experimental method using gas gun or other apparatus. An optical system including a phase zone plate reduces the interference and also makes the focused-beam-intensity distribution uniform. We wrote a computer code that calculates light ray traces. Using the code we designed and fabricated an optical system including a phase zone plate and improved the laser-beam uniformity. We introduce preliminary experimental results of laser induced shock of the samples such as aluminum and other materials.
50Wh급 배터리 충전을 위한 휴대용 자가발전시스템 연구
이지영(Ji-Young Lee),구대현(Dae-Hyun Koo),한충규(Choong-Kyu Han) 대한전기학회 2012 전기학회논문지 Vol.61 No.2
This paper deals with an design of axial flux electric machine which is a key element for a compact size in a portable and manual generator system. It is expected that the generator system with an axial flux electric machine is more light and has higher efficiency than other types of generator systems. And it is used the soft magnetic composite core instead of silicon steel core in the axial flux electric machine for more compact size. The weight and efficiency of the generator system are the main keys to select the value of design variables. In this paper, the overall design process to meet the design goals, and the design results are presented with experiment results.