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기업의 재무적 활동성지표와 수익성지표의 동질성에 관한 사례연구
신영빈(Youngbin Shin),정기만(Kiman Jeomg) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
투자자의 투자종목의 선택이나 기업의 성장성, 장기성, 효율성 등을 평가하는 관점에서 수익성지표와 황동성지표는 정보이용자에게 중요한 정보를 제공한다. 기업수익력을 평가할수 있는 수익성지표와 활동성지표의 동질성을 검증하기 위해서 사례기업인 SK텔레콤와 LG유플러스의 수익성비율사례분석과 활동성비율사례분석을 하였다. 결과적으로 수익성비율에서는 SK텔레콤이 우수한 모습을 보였고 활동성비율에서는 LG유플러스가 재고자산회전율을 제외한 지표에서는 우세한 모습을 보였기 때문에 수익성지표와 활동성지표사이에는 연관성을 찾기는 어렵다고 보인다. 더 객관적인 사실파악을 위해서 추후에 더 많은 사례기업의 검토가 필요하다고 본다.
Cho, Youngbin,Son, Minjeong,Jeong, Hyuntae,Shin, Jennifer H. American Society for Cell Biology 2018 Molecular biology of the cell Vol.29 No.19
<P>During wound healing, cells migrate with electrotactic bias as a collective entity. Unlike the case of the electric field (EF)-induced single-cell migration, the sensitivity of electrotactic response of the monolayer depends primarily on the integrity of the cell–cell junctions. Although there exist biochemical clues on how cells sense the EF, a well-defined physical portrait to illustrate how collective cells respond to directional EF remains elusive. Here, we developed an EF stimulating system integrated with a hydrogel-based traction measurement platform to quantify the EF-induced changes in cellular tractions, from which the complete in-plane intercellular stress tensor can be calculated. We chose immortalized human keratinocytes, HaCaT, as our model cells to investigate the role of EF in epithelial migration during wound healing. Immediately after the onset of EF (0.5 V/cm), the HaCaT monolayer migrated toward anode with ordered directedness and enhanced speed as early as 15 min. Cellular traction and intercellular stresses were gradually aligned perpendicular to the direction of the EF until 50 min. The EF-induced reorientation of physical stresses was then followed by the delayed cell-body reorientation in the direction perpendicular to the EF. Once the intercellular stresses were aligned, the reversal of the EF direction redirected the reversed migration of the cells without any apparent disruption of the intercellular stresses. The results suggest that the dislodging of the physical stress alignment along the adjacent cells should not be necessary for changing the direction of the monolayer migration.</P>