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Construction of a Thermal Vacuum Chamber for Environment Test of Triple CubeSat Mission TRIO-CINEMA
Jeon, Jeheon,Lee, Seongwhan,Yoon, Seyoung,Seon, Jongho,Jin, Ho,Lee, Donghun,Lin, Robert P. 한국우주과학회 2013 Journal of Astronomy and Space Sciences Vol.30 No.4
TRiplet Ionospheric Observatory-CubeSat for Ion, Neutron, Electron & MAgnetic fields (TRIO-CINEMA) is a CubeSat with 3.14 kg in weight and 3-U (10 x 10 x 30 cm) in size, jointly developed by Kyung Hee University and UC Berkeley to measure magnetic fields of near Earth space and detect plasma particles. When a satellite is launched into orbit, it encounters ultrahighvacuum and extreme temperature. To verify the operation and survivability of the satellite in such an extreme space environment, experimental tests are conducted on the ground using thermal vacuum chamber. This paper describes the temperature control device and monitoring system suitable for CubeSat test environment using the thermal vacuum chamber of the School of Space Research, Kyung Hee University. To build the chamber, we use a general purpose thermal analysis program and NX 6.0 TMG program. We carry out thermal vacuum tests on the two flight models developed by Kyung Hee University based on the thermal model of the TRIO-CINEMA satellite. It is expected from this experiment that proper operation of the satellite in the space environment will be achieved.
Higher Order Eigenfields in Mode Ⅱ Cracks Under Elastic-Plastic Deformation
Insu Jeon,Yongwoo Lee,Seyoung Im 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.2
The explicit formulation of the J-integral and the M-integral is constructed in terms of the stress intensity factor and the higher order stress coefficients for Mode II cracks under small or large scale yielding. Furthermore, the stress intensity factor and the higher order stress coefficients as well are computed with the aid of the two-state J-and the M-integral, which is found to be accurate and efficient. It is found that the contribution from the higher order singularities to the J-integral is closely related to the configuration of the plastic zone.<br/>
전미선(Meesun Jeon),박세영(SeYoung-Park) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.2A
한국전자통신연구소 언어정보연구실에서는 (주) 계몽사에서 출판한 학생 백과 사전을 전자도서화하였다. 이 전자도서는 키워드에 대한 하이퍼텍스트, 하이퍼미디어 기능 및 백과사전의 내용을 자연어로 검색할 수 있는 기능, 멀티미디어 데이타를 검색해 볼 수 있는 기능 등을 가지고 있다. 본 논문에서는 하이퍼텍스트 기능을 구현하기 위해 자동으로 키워드를 추출할 대 문서의 의미상 전혀 관계가 없으나 동음이외어인 이유만으로 추출되는 키워드들을 제거하기 위한 키워드망을 제안하기 키워드망 구축에 관해 설명한다.