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지석만,최주호,김준범,하덕식 한국 항공대학교 항공산업기술연구소 2001 航空宇宙産業技術硏究所 硏究誌 Vol.11 No.-
This paper addresses a method for numerical simulation in the pressing process of hot glass. Updated Lagrangian finite element formulations are employed for the flow and energy equations to accommodate moving meshes. The model is assumed axi-symmetric and creep flow is assumed due to the high viscosity. Commercial software ANSYS is used to solve the coupled flow and energy equations. Moving contact points as well as free surface during the pressing are effectively calculated and updated by utilizing API functions of CAD software Unigraphics. The mesh distortion problem near the wall is overcome by automatic remeshing, and the temperatures of the new mesh are conveniently interpolated by using a unique function of ANSYS. The developed model is applied to the pressing process of TV glasses. In conclusion, the presented method shows that the pressing process accompanying moving boundary can be simulated by effectively combining general purpose softwares without resorting to special dedicated codes.
BF 인증기준의 바닥 안전성에 관한 정량적 평가지표 검토
지석원 ( Ji Suk-won ),백권혁 ( Baik Kwon-hyuk ),최수경 ( Choi Soo-kyung ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
For Barrier-Free certification, the floor and ground surfaces must be finished with materials that are not slippery, flat, and have low-impact in fallis. However, the BF Certification Act does not provide specific methods to meet these regulations. In performance-based design, the responsibility of proving the performance rests with the building owner and architect, so quantitative evaluation indexes are needed to select suitable materials. Furthermore, changes in performance after completion should be checked periodically in 'As-Is' conditions. There are various methods for slips, trips and falls risk assessment, causing confusion for users. In this study, the results of previous studies on the evaluation methods of slips, trips and falls were considered closely, and each quantitative evaluation index that can be used in the new construction and maintenance phase was presented.
KOMPSAT-3A Cal/Val을 위한 Spatial Target 설치방법 연구
지석원,서두천,진청길 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
한국항공우주연구원은 2015 년 3 월 25 일 KOMPSAT-3A 위성을 성공적으로 발사하였다. KOMPSAT-3A 위성의 광학 및 IR 품질 확인 및 검보정을 수행하기 위해서 전라남도 고흥항공센터에 Spatial Edge 타겟을 설치하였다. Spatial 품질측정 인자인 MTF 측정과 IR 영상의 NETD 측정을 위해 위성진행방향과 5 도 차이가 영상에서 나타나도록 지상타겟을 설치하였으며, 설치된 타겟이 KOMPSAT-3A 의 영상 품질 측정 및 검보정 작업에 적합하도록 위성 탑재체의 특성치 및 건설재료기술 및 건설공법, 제작기술까지도 고려하였다. 본 논문에서는 KOMPSAT-3A Cal/Val 을 위해 적합한 지상 Spatial Edge 타겟설치 방법을 기술한다. KOMPSAT3A is the satellite Korea Aerospace Research Institute (KARI) launched on 25 March 2015. ground target was required to perform a quality check and calibration of KOMPSAT-3A image according to the launch of the satellite, KARI installed ground Spatial Edge target in Go-heung Aviation Center located in Jeollanam-do, Republic of Korea to perform KOMPSAT-3A Cal/Val. The spatial target was designed to appear bright/dark area for measuring NETD and including a line displaced diagonally to the satellite direction measurements for MTF measurement. Construction materials technology and construction method, manufacturing technologies as well as remote sensing technologies also should be considered for the installation of this kind of spatial target. This study is to evaluate the proper way to install Spatial Edge target on the ground for KOMPSAT-3A Cal / Val.