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사각 캐비티를 가진 수평채널 내에서의 혼합대류에 관한 수치적 연구
고영창(Y. C. Ko),배대석(D. S. Bae) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A numerical simulation is carried out mixed conviction in horizontal channel with a heat source from below of rectangular cavity. Finite volume method was employed for the discretization and PISO algorithm was used for calculating pressure term. The parameters governing the problem are the Reynolds number (10?²≤Re≤50), the Rayleigh number (10³≤Ra≤2.06×10?) the Prandtl number (0.72≤Pr≤909.1), the aspect ratio (0.5≤A=D/H≤2) and the angle of inclination (0˚≤θ≤60˚). Mean Nusselt number distributions were obtained and effect of Reynolds, Rayleigh number and Prandtl number on mixed convection in the horizontal channel with rectangular cavity were investigated.
고영창(Young-Chang Ko),배대석(Dae-Seok Bae) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
A two-dimensional numerical calculation has been performed to investigate mixed convection in rectangular cavity with high viscous fluid. In this study, the High Prandtl number was 909, the Reynolds number was varied from 0 to 10, the Rayleigh number from 0 to 10? and the aspect ratio from 0.5 to 1. The governing equations were discretized using the finite volume method. From a parametric study, velocity and temperature distributions were obtained and discussed. Average Nusselt number distributions were obtained and effect of Reynolds number, Rayleigh number and the aspect ratio on mixed convection in the rectangular cavity with high viscous fluid were investigated.
CDGPS의 요동 측정 결과를 이용한 Spotlight SAR 영상 형성에관한 연구
황정훈,고영창,김소연,권경일,윤상호,김형석,신현익 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.2
To develop and evaluate the real-time SAR(Synthetic Aperture Radar) motion measurement system, true antenna phase center(APC) positions during SAT(Synthetic Aperture Time) are needed. In this paper, CDGPS(Carrier phase Differential Global Positioning System) post processing method is proposed to get the true APC position for spotlight SAR image formation. The CDGPS position is smoothed to remove high frequency noise which exists inherently in the carrier phase measurement. This paper shows smoothed CDGPS data is enough to provide the true APC for high-quality SAR image formation through motion measurement result, phase error estimation and IRF(Impulse Response Function) analysis.
Management of Early Implant Failure Associated with A Remnant: A Case Report
이정원,이동섭,고영창,정정우,이승희,이용무 대한구강악안면임플란트학회 2023 대한구강악안면임프란트학회지 Vol.27 No.4
Implant restoration, a predictive procedure for edentulous areas, can suffer from early failure due to several factors. While thorough debridement of the extraction socket is standard practice for implant placement, unintentional remnant can occur. This case report presents an early implant failure following placement and guided bone regeneration. Radiological examination revealed radiopaque material around the implant, prompting material removal and subsequent biopsy. The histological analysis identified the area surrounding the bone material as granulation tissue containing chronic inflammatory cells, while the hard tissue area exhibited hypercementosis or periapical cemento-osseoeous dysplasia. These findings suggest unintentional placement of the implant into a remnant following the previous extraction. This case highlights the importance of thorough debridement after tooth extraction. Moreover, pre-implant placement radiological evaluation is necessary to avoid implant failure associated with unintentionally retaining lesion.