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Numerical Study on the Air-Cushion Unit for Transportation of Large-Sized Glass Plate
임익태,김광선,전현주 한국반도체디스플레이기술학회 2007 반도체디스플레이기술학회지 Vol.6 No.1
Non-contact transportation of a large-sized glass plate using air cushion for the vertical sputtering system of liquid crystal display (LCD) panel was considered. The objective of the study was to design an air pad unit which was composed of multiple injection and exhaust holes and mass flow supplying pipe. The gas was injected through multiple small holes to maintain the force for levitating glass plate. After hitting the plate, the air was vented through exhaust holes. Complex flow field and resulting pressure distribution on the glass surface were numerically studied to design the air injection pad. The exhaust hole size was varied to obtain evenly distributed pressure distribution at fixed diameter of the injection hole. Considering the force for levitating glass plate, the diameter of the exhaust hole of 30 to 40 times of the gas injection hole was recommended.
InGaN/GaN 양자우물의 SA-MOVPE에서 표면확산을 고려한 박막성장 해석
임익태,윤석범 한국반도체디스플레이기술학회 2011 반도체디스플레이기술학회지 Vol.10 No.3
Film growth rate and composition variation are numerically analyzed during the selective area growth of InGaN on the GaN triangular stripe microfacet in this study. Both the vapor phase diffusion and the surface diffusion are considered to determine the In composition on the InGaN surface. To obtain the In composition on the surface, flux of In atoms due to the surface diffusion is added to the concentration determined from the Laplace equation which is governing the gas phase diffusion. The solution model is validated by comparing the growth rates from the analyses to the experimental results of GaN and InN films. The In composition and resulting wave length are increased when the surface diffusion is considered. The In content is also increased according to the increasing mask width. The effect of mask width to the In content and wave length is increasing in the case of a small open region.
암시적 VOF법을 이용한 중력주조에서의 충전 및 응고과정에 대한 연구
임익태,김우승,Im, Ik-Tae,Kim, Woo-Seung 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.1
In this study, a three-dimensional gravity casting problem has been examined to investigate a coupled phenomenon of the filling and solidification process. This work simultaneously considers the two key phenomena of metal casting : the fluid flow during mold filling, and solidification process. The VOF method is used to analyze the free surface flow during filling and the equivalent specific heat method is employed to model the latent heat release during solidification. The time-implicit filling algorithm is applied to save the computational time for analyzing the mold filling process. The three-dimensional benchmark problem used in the MCWASP VII has been solved using both the implicit and explicit algorithm, and the present results are compared with the benchmark experimental results and the other numerical results.
임익태,김우승,Im, lk-Tae,Kim, Woo-Seung 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.8
An algorithm for modeling the filling of metal into a mold and solidification has been developed. This algorithm uses the implicit VOF method for a filling and a general implicit source-based method for solidification. The model for simultaneous filling and solidification is applied to the two-dimensional filling and solidification of a square cavity. The effects of the wall temperature and gate position on the solidification are examined. The mixed natural convection flow and residual flow resulting from the completion of a filling are included in this study to investigate the coupled effects of the filling and natural convection on solidification. Two different filling configurations (assisting flow and opposite flow due to the gate position) are analysed to study the effects of residual flow on solidification. The results clearly show the necessity to carry out a coupled filling and solidification analysis including the effect of natural convection.
A Study on the Dielctric Properties of the PTC BaTiO3 Ceramic Thin Films
임익태,소병문 한국반도체디스플레이기술학회 2012 반도체디스플레이기술학회지 Vol.11 No.3
The films were deposited at evaporator system and were annealed at heat treatment. The films had a dense microstructure with fine grains. The electrical properties of the films were dramatically controlled with annealing. Samples Preparation were analyzed in term of positive temperature coefficient of Resistivity Samples were made in the substrate tempera-true of 400oC deposition time of 10 hours, and forward power of 210watt. R-T(resistivity-temperature) Characteristics of the samples were investigated as a function of the substrate type and the ambient temperature. The resistivity of the thin film specimens was compared with that of the bulk type specimens. By using RF/DC magnetron sputtering system, we obtained lower resistivity in the thermistor with thin BaTiO3 film than that in the bulk type thermistor.
A Numerical Study of the Flow Characteristics and Separation Efficiency of a Hydrocyclone
임익태,곽규동,김세민,박영기 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.11
In this study, mixture flow of sand and water within a hydrocyclone was investigated using the Eulerian-Eulerian model based on a Computational Fluid Dynamics (CFD) technique. Experiments were also performed to validate the numerical analyses results. In Eulerian-Eulerian analyses, both solid and liquid phases are regarded as continua. Accordingly, conservation equations, such as continuity and momentum equations, are applied to each phase of sand and water. In this study, the RNG k-ε model was used as a turbulence model. The results of the computational analysis were compared with those obtained experimentally. The CFD and experimental results were largely consistent with each other. The accuracy of the analysis model was compared with the experiment, and the effects of inlet volume fraction of solid and inlet velocity of the mixture on separation efficiency were examined. Separation efficiency decreased as inlet velocity increased. In addition, separation efficiency was high when solid concentration was low (3%), but there was no relationship between concentration and separation efficiency when the solid concentration was above 6%.