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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.
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>
Deuk-Chul Kwon,Heechol Choi,Dong-Hun Yu,Hyo-Chang Lee,Hee-Hwan Choe,Nam-Sik Yoon 한국물리학회 2016 Current Applied Physics Vol.16 No.6
In order to overcome limitations on the simulation time step for fluid transport simulations of high density plasma discharges, the dielectric relaxation scheme (DRS) was developed. By imitating a realistic and physical shielding process of electric field perturbation, DRS overcomes the dielectric limitation on simulation time step. However, the electric field was obtained by assuming the drift-diffusion approximation for both the electrons and ions. Although the drift-diffusion expressions are good approximations, the inertial term cannot be neglected in the ion momentum equation for low pressure. Therefore, in this work, we developed the extended dielectric relaxation scheme (EDRS) by introducing an effective electric field. Similar to DRS, EDRS is limited to quasi-neutral plasma with zero current, i.e. EDRS is applicable when the local ambipolarity is satisfied. In order to validate EDRS, two-dimensional fluid simulations for inductively coupled plasma discharges were performed. The simulation results are then compared with experimental measurements by using a Langmuir probe.