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이상윤,라병욱,박동수,황인헌,이덕동,신영남,박성배,이동욱,박용석,박형근,손상호,권태근,채경락,정경득 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-
An Ac-type Plasma Display Panel (PDP) operating with Ne-Ar(0.1%) Penning mixture gas is fabicated. The characterics of the panel with electrodes covered with thin and thick dielectric layers are studied. The brightness of the Neon-orange light emitted by the panel measured as function of applied voltage and frequency. As an application, a graphic display system equipped with PDP showing still and moving pictures is made.
A Design and Measurement of a Reference Signal Generator for a Radar System
Dong-Sik Kim,Min-Chul Kim,Su-Ho Lee,Seung-Hun Baik,Ho-Sang Kwon,Myung-Deuk Jeong 한국전자파학회JEES 2009 Journal of Electromagnetic Engineering and Science Vol.9 No.3
This paper discusses the design and fabrication of a reference signal generator for a naval radar system, including the vibration environment test. The transmit signals of the S-band radar system are synthesized by the reference signal and the phase noise must lower than ?130 ㏈c/㎐ at a 10 ㎑ offset frequency. To achieve this specification, the phase noise of the reference signal needs to be less than ?165 ㏈c/㎐ at a 10 ㎑ offset. For achieving very low phase noise performance by the reference signal generator, the phase locked loop technique is applied with a 10 ㎐ loop bandwidth. Also, this reference signal generator has ±0.35 ppb short-term stability to minimize instant phase errors and high vibration sensitivity against a ship's shaking, unbalanced rotating of antennas and so on.
Kwon, Deuk-Chul,Shin, Sung-Sik,Yu, Dong-Hun Elsevier 2017 Computer physics communications Vol.219 No.-
<P><B>Abstract</B></P> <P>In order to reduce the computing time in simulation of radio frequency (rf) plasma sources, various numerical schemes were developed. It is well known that the upwind, exponential, and power-law schemes can efficiently overcome the limitation on the grid size for fluid transport simulations of high density plasma discharges. Also, the semi-implicit method is a well-known numerical scheme to overcome on the simulation time step. However, despite remarkable advances in numerical techniques and computing power over the last few decades, efficient multi-dimensional modeling of low temperature plasma discharges has remained a considerable challenge. In particular, there was a difficulty on parallelization in time for the time periodic steady state problems such as capacitively coupled plasma discharges and rf sheath dynamics because values of plasma parameters in previous time step are used to calculate new values each time step. Therefore, we present a parallelization method for the time periodic steady state problems by using period-slices. In order to evaluate the efficiency of the developed method, one-dimensional fluid simulations are conducted for describing rf sheath dynamics. The result shows that speedup can be achieved by using a multithreading method.</P>
THEMIS Pi2 observations near dawn and dusk sectors in the inner magnetosphere
Kwon, Hyuck-Jin,Kim, Khan-Hyuk,Lee, Dong-Hun,Takahashi, K.,Park, Young-Deuk,Bonnell, J.W. 한국우주과학회 2010 한국우주과학회보 Vol.19 No.1
The most frequently suggested source for Pi2 pulsations in the inner magnetosphere (L < 4) is standing fast-mode waves trapped in the plasmasphere (i.e., plasmaspheric resonances). They have been considered as the source of low-latitude Pi2 pulsations. Th