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관성-마찰 압전 작동기를 적용한 소형 위성용 포커스 메커니즘 설계
홍대기(Dae-Gi Hong),황재혁(Jai-Hyuk Hwang) 항공우주시스템공학회 2018 항공우주시스템공학회 학술대회 발표집 Vol.2018 No.11
소형 지구 관측 위성의 경우 정밀한 관측을 위해 광학 요소 간의 정렬이 중요하다. 그러나 위성 카메라는 진동 운동 및 충격이 가해지는 발사 환경과 무중력, 진공, 복사열 및 가스 제거가 이루어지는 우주 환경에서 광학 요소 간 정렬오차가 발생한다. 광학 요소들 간의 정렬오차는 화질 저하를 야기하고, 정렬오차를 보상하기 위해 리포커싱 프로세스가 필요하다. 본 논문에서는 리포커싱 과정을 수행하기 위한 3-축 포커스 메커니즘을 제안하였다. 본 메커니즘은 부 반사경의 뒷면에 부착되어 3-축 운동을 통한 x축, y축 틸트 및 de-space를 보정한다. 이를 위해 3개의 관성-마찰 압전 작동기로 포커스 메커니즘을 구성하였으며, 제작된 포커스 메커니즘은 PD 서보 제어를 통하여 우수한 서보 성능을 입증하였다.
홍대식(Hong, Dae Sik),임덕기(Lim, Duk Gi) 서강대학교 법학연구소 2012 법과기업연구 Vol.2 No.1
The Internet use environment is expected to change rapidly. Accordingly, to flexibly cope with these changes in the Internet environment and to secure national competitiveness in the Internet Services market, the government should establish policies that aggressively invigorate internet use. Future policies and legal systems for promotion of Internet use must take the characteristics of Internet-based services into consideration and come up with ways to provide appropriate support. To this end, it is necessary to prepare the promotion policy for enhancement of the reliability of Internet-based services and contents, and lay the foundation for development of support programs. Also, it is necessary to promote a sound Internet use culture and fair competition and win-win cooperation among Internet service providers. The entry barrier must be lowered so that new Internet-related enterprises can enter the market more easily and the support system must be instituted. In consideration of the global nature of the Internet, the foundation for global cooperation in regard to extraterrestrial application of Internet-related laws must be laid down, and the grounds for cross-recognition of extraterrestrial application in related countries must be prepared. That is, efforts must be made to figure out ways to enhance the global governance competency.
김종기,홍대형,Kim, Jong-Gi,Hong, Dae-Hyung 한국건축역사학회 1992 건축역사연구 Vol.1 No.1
I'm going to endow with any characters to the mixed history of Korean Contemporary Architecture, and rearrange the relations between motive of transfer and the ideology which is concluded in expression through considering the transitional period which is based on the modernity, tradition and additional area such as ideology, politics, technology, literature, sculpture and painting etc. This abstract explain only characters of revivalism in Korean Contemporary Architecture. Revivalism have some complexed nationalistic leanings. Our transitional succession returned to revivalism that is limitted by its form. Of course, that is dued to complexed operating such as the Ideal Nationalism against the severance of our culture which had been done by Japan, the Superior Nationalism which is developed by antagonism of our own ideology was dued to dividing into sections of our own country, and the Resistant Nationalism against foreign culture.
이해관계자 요구사항 기반 기술정보 도출 방법론 - 나노 센서 사례
기완욱,김광수,홍대근,Gi, Wan Wook,Kim, Kwang Soo,Hong, Dae Geun 한국시스템엔지니어링학회 2018 시스템엔지니어링학술지 Vol.14 No.1
For the purpose of technology planning and R&D strategy, this research developed a methodology for deriving technical information based on stakeholder requirements using natural language processing technology. The requirements are decomposed into semantic information based on grammar rules, and then the requirement information based technology information can be derived by linking with the three technical information extracted from the patent.