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복수구조 전개 및 발사체 분리직후 시스템 자동운용을 위한 큐브위성의 메커니즘 설계
이명재,정현모,오현웅,Lee, Myoung-Jae,Jung, Hyun-Mo,Oh, Hyun-Ung 항공우주시스템공학회 2013 항공우주시스템공학회지 Vol.7 No.3
In case of cube satellite, it is difficult to realize the same performance as commercial satellite due to its highly restricted unit accommodation space. To maximize the performance of the cube satellite, design concept considering the multi-function of satellite is required. In this paper, mechanism design of cube satellite which is applicable for the holding and release of multi-deployable structures has been proposed and investigated. In addition, a switch mechanism design for the autonomous system operation just after the cube satellite separation from P-POD has also been proposed. The effectiveness of the mechanism design for holding and release of multi-deployable structures has been demonstrated by EM test of the holding and release mechanism.
고분자 플라스틱 기판과 유리 기판위에 증착한 알류미늄 박막 특성 분석
이명재,곽성관,김동식,김장권,Lee, Myoung-Jae,Kwak, Sung-Kwan,Kim, Dong-Sik,Kim, Jang-Kwon 대한전자공학회 2002 電子工學會論文誌 IE (Industry electronics) Vol.39 No.2
플라스틱 기반 평판디스플레이 장치를 위한 Al 박막(1000-4000${\AA}$)을 직류-마그네트론 스퍼터링으로 유리 기판과 고분자 플라스틱 기판위에 증착하였다. 고분자 플라스틱 기판위에 증착된 Al박막의 전기적 특성을 향상시키고, 열 팽창을 줄이기 위하여 단계적 열 처리법을 사용하였다. 이러한 공정을 사용함으로써, 고분자 기판위에 증착된 박막의 크랙과 기판의 휨현상이 없는 Al 박막을 성공적으로 증착하였다. 또한, Al 박막의 열처리와 증착공정은 모두 200$^{\circ}C$ 이하에서 이루어 졌기 때문에, 이러한 저온 공정은 고분자 플라스틱 기판에 적용이 가능하다. Al 박막의 특성과 신뢰성을 조사하기 위하여 주사 전자 현미경(SEM), 원자력 현미경(AFM), X-선 회절 분석법(XRD)과 비저항등의 전기적 특성을 측정하였다. Al films (1000~4000${\AA}$)were deposited on glass and polymer(polyethersulfine) plastic substrates by DC-magnetron sputtering for plastic-based flat-panel displays. A stepped heating process was used both to improve the electrical characteristics and to diminish the thermal expansion of the polymer substrates. Following this procedure, we could succeed in sputtering Al films without any cracking or shrinkage of the polymer substrates. The treatment temperatures and deposited process of Al films were under 200$^{\circ}C$. Also, this low temperature fabrication process allows the application of plastic substrates. Scanning Electrom Microscopy, Atomic Force Microscopy, X-ray Dffractometry, and electrical measurements such as resistivity measurements were performed to investigate the properties of deposited the Al films and their reliability.?
철도교량 교각 안전성 평가를 위한 현장 충격 진동하중 실험
유민택 ( Yoo Mintaek ),이명재 ( Lee Myoung-jae ),정현석 ( Jung Hyun-seok ),이일화 ( Lee Il-wha ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
The current stability assessment criteria for railway bridge pier depends on only macroscopy visual examination, therefore, it is needs to systematic and quantitative method for evaluating the stability of railway bridge pier system. In this research, the impact load tests were performed to measure natural frequency of railway bridge pier, the results of tests were analyzed to evaluate bridge pier stability quantitatively. The targer bridge pier is located in Donghae-Nambu line which has plan to be removed. In order to measure dynamic behavior of bridge pier, three accelerometers were installed model pier, which are attached from 50 cm of upper and lower side and center of pier. As the results, the bridge pier is generally stable in case of rock condition, and is not stable in case of sand condition. In addition, scour effect could be evaluate by analyzing torsional dynamic behavior of bridge pier.