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김여정,형식,KIM YEOJEONG,HYUNG SIEK,ALLER LAWRENCE H. 한국천문학회 2000 天文學論叢 Vol.15 No.suppl1
Symbiotic stars are known as binary systems with both cool and hot components with enshrounding nebulous gas. The cool component, M-type giant, is presumably loosing its mass into a hot white or main sequence companion star through the inner Lagrangian point. The lines emit from the ionized nebulous region around the hot star while the mass loss or accretion activity is believed to be the main cause of sudden variation of the continuum and line fluxes. We selected 17 symbiotics for which the emission line fluxes were measured from the IUE SWP, LWR data, to find variability of spectrum. We also investigated the periodic variation of emissions or eclipsing effect from the IUE lines. All of our symbiotics show very high electron densities in the emission regions. For other optical symbiotics, the observations had been carried in 1999 with BOAO mid-resolution spectrometer. We classified symbiotics based on their outburst activities, or emission line characteristics, i.e., $OVI{\lambda}6830.\;The\;OVI{\lambda}6830$ emission lines are also found in S-type symbiotics, which have been known as charateristics of D-types.
김강민,김여정,윤태석,KIM KANG-MIN,KIM YEOJEONG,YOON TAE SEOG 한국천문학회 2001 Journal of The Korean Astronomical Society Vol.34 No.1
We tested the characteristics of the BOAO Medium Dispersion Spectrograph (MDS) such as the CCD capabilities, wavelength shift by gravity direction variation, slit illumination function and efficiency. Then we calculated the appropriate exposure time to obtain the given S/N ratio for several given magnitudes. Also the remaining problems to be improved were discussed.
전진무(Jinmoo Jeon),민경휘(Gyeonghwi Min),김여정(Yeojeong Kim),김동현(Donghyun Kim) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
The knuckle of the in-wheel system functions as a knuckle of the conventional vehicle and a housing for supporting the reducer and the motor. In-wheel knuckle should maintain rigidity against deformation by the motor and reducer during inwheel operation in order to ensure NVH performance, also in order to secure the vehicle R&H performance, it should be designed to support load from wheel, secure stiffness and reduce the unsprung mass. In this thesis, we performed the lightweight of knuckle in in-wheel system with motor and reducer by using topology optimization. After the optimization, we verified the static strength and stiffness analysis through finite element analysis and compared the transmission error through the gear analysis program and then we could check the effectiveness of the lightweight design. As a result of comparison between before and after, we confirmed stiffness securement and weight reduction.