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오충석,선병찬,박용규,노웅래 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
한국형 발사체의 달 탐사용 상단 회전안정화 규격을 설계하기 위해 유사 발사체의 회전안정화 방식을 조사하였으며 분석을 수행하였다. 사례조사한 발사체 및 위성은 Delta-Ⅱ, Space Shuttle PAM(Payload Assist Module), Lunar Prospector/TLI 및 M-V로 상단 발사체 고체 모터 규격 및 회전안정화 시스템 규격을 정리하였다. The study on the upper stage spin-stabilization of the similar launch vehicle has been conducted to define the requirement of KSLV-Ⅱ upper stage spin-stabilization system. The specification of the spin-stabilization system of Delta-Ⅱ, Space Shuttle PAM(Payload Assist Module), Lunar Prospector/TLI and M-V was investigated and summarized.
비용 효율적인 유연 디스플레이용 무색 투명 폴리이미드 필름 제작
오충석,조다운,김지호 한국반도체디스플레이기술학회 2023 반도체디스플레이기술학회지 Vol.22 No.1
As the demand for large flexible displays such as tablet computers continues to rise, there is an increasing need for cost-efficient colorless and optically transparent polyimide film that can meet the desired performance, particularly optical transmittance. In this study, we investigated a detailed procedure for achieving optimal optical transmittance using two different combinations of monomers: 6FDA+BAPB and 6FDA+BPA+TFDB. We employed a design of experiment method to systematically synthesize polymers, allowing for the optimization of optical transmittance. In addition, we were able to achieve uniform thickness in the films by using a doctor blade. By comparing the price and optical transmittance of four different monomer combinations, we obtained fundamental data on the production of polyimide films that can be customized to meet the specific price and performance requirements of manufacturers. This approach enables users to select the most suitable polyimide film based on their desired price and performance parameters while achieving optimal optical transmittance.