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THE LUMINOSITY OF TYPE IA SUPERNOVA AND THE PROPERTIES OF THEIR EARLY-TYPE HOST GALAXIES
KANG, YIJUNG,KIM, YOUNG-LO,LEE, YOUNG-WOOK,LIM, DONGWOOK,CHUNG, CHUL,SUNG, EON-CHANG The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
In type Ia supernovae (SNe Ia) cosmology, a well-established correlation exists between the mass of host galaxies and the Hubble residual (HR) of SNe Ia. In order to investigate the origin of this correlation, we used low-resolution spectroscopic data of early-type host galaxies obtained from our YOnsei Nearby Supernovae Evolution Investigation (YONSEI) project. We measured velocity dispersions and Lick/IDS absorption line indices from these fully calibrated spectra. These indices were used to estimate the luminosity-weighted mean age, metallicity and mass of host galaxies. We found a tight correlation between host mass and population age, which is consistent with the "downsizing" trend in early-type galaxies. This suggests that the well-established correlation between HR and host mass is most likely due to the difference in population age. More observations, which are in progress, are required to understand the impact of luminosity evolution on SNe Ia cosmology.
건설현장 작업종사자의 안전의식이 조직에 대한 신뢰와 이직의도에 미치는 영향
윤이중(Youn, Yijung),김옥규(Kim, Okkyu) 대한건축학회 2020 대한건축학회논문집 Vol.36 No.7
In this study, the purpose of the study was to verify the relationship between construction workers safety consciousness, organizational trust and turn-over intention. A survey for 357 workers was carried out and a statistical analysis was performed using the SPSS 25.0 program. As a result, the following main results were obtained: First, it was found that workers safety consciousness factors such as safety understanding, safety & process importance and regulation strictness have significant positive effects on their organizational trust. Second, it was revealed that the workers organizational trust had a significant negative effect on turn-over intention. Third, it was shown that workers safety consciousness factors such as safety understanding, safety & process importance and regulation strictness have significantly negative effects on turn-over intention. In addition, this study confirmed that the degree of safety understanding of the workers to control safety at the work site is the most important factor in safety consciousness in order to enhance organizational trust and to decrease turn-over intention.