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Application Study of Sequential Soil Flusing for Uranium Removal
Seeun Chang,Hyun-Kyu Kim,Woo Shin Park,Sungbin Park,Hongrae Jeon 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
A sequential column experiment was conducted for uranium removal of excessively high or highly U-contaminated soils, simultaneously. Two pilot-scale acryl columns with a 24 cm ID and 48 cm length were uniformly packed with each U-contaminated soil (both < 2 mm, 119, and 22.4 Bq/g as initial U-238 activities). A column packed with soil contained very high U constant located first then sequentially located second columns with relatively lower U-contaminated soil. Thus the effluents which passed very high U-contaminated soil and having extremely high dissolved U concentration was directly inflowed the second columns. Both columns initially and respectively flushed with demi water (or condensing water of air conditioner generated from radiation controlled area) to saturate and displace the air from the pore space. Elution was carried out with alkaline and acidic solutions, respectively, and sequentially. The uranium removal efficiencies were found and a comparison was made with the pilot soil flushing experiments. During this study, a new approach to reducing acidic flushing waste which is considered the biggest defect of soil washing/flushing was established, and optimal factors were calculated to demonstrate industrial-scale uranium decontamination of soil with high uranium content.
Profiling of miRNA expression in mice kidney with diabetic nephropathy
Park, Hye Rim,Lee, Seung Eun,Kim, Hyemi,Jeon, Seeun,Han, Dongkyo,Jin, Young-Ho,Cho, Jeong-Je,Ahn, Hyun-Jong,Park, Cheung-Seog,Lee, Jongsung,Park, Yong Seek THE KOREAN SOCIETY OF TOXICOGENOMICS AND TOXICOPRP 2018 MOLECULAR AND CELLULAR TOXICOLOGY Vol. No.
The Effect of Children's Age on Married Women's Career Reinterruption
Seeun Park,Sun Go 한국유통과학회 2018 The Journal of Industrial Distribution & Business( Vol.9 No.7
Purpose - The main purpose of this paper is to examine the effect of children’s age on maternal labor supply in Korea using survival analysis. Specifically, we focus on the career re-interruption of women having children under age 12, which has rarely been studied in the existing literature. Research design, data, and methodology - We use micro data from the Korea Labor and Income Panel Study (KLIPS) surveyed from 1998 to 2016. Instead of using a pre-school child dummy or the number of young children as an explanatory variable, 9 children’s age dummies are included to capture the effect of nurturing 0 to 9 years old children. This study estimates the hazard of a woman’s exiting the labor market after her first experience of the career interruption, rather than the hazard of the first career interruption itself. A Cox proportional hazard model is applied to numerically capture the impact of children’s age on behavioral changes in maternal labor supply. The sample used in this analysis is women between 15 and 54 years old. Most of all, we restrict the sample to women who had at least a child between 0 and 12 years old at the time of quitting their jobs. Results - The Cox proportional hazard model estimates show a strong negative effect of a 0-year-old child on maternal labor supply. Mothers with newborns have a high hazard ratio of labor force exit after the re-entry. The hazard of women with infants is three times higher than those with children aged 10 to 18. Additionally, the results show that not only newborns, but also children in the age of school-entry have a negative impact on their mother’s labor supply. Conclusions - The findings reveal that children’s ages need to be properly expanded and included when analyzing the effect of children and their ages on married women’s labor supply, especially on women’s career re-interruption. A large negative effect of 7-year-old children on maternal labor supply found here indicates that supporting mothers with school age children as well as pre-school children is necessary to prevent mothers from leaving the labor market.
Ahn, Seeun,Park, Sungon,Park, Sangha,Choi, Hyomin,Jeon, Yein,Lee, Hyejoo The Korea Contents Association 2022 International Journal of Contents Vol.18 No.3
The purpose of this study was to investigate the satisfaction of personnel selection process according to type of personnel manager and to examine whether the relationship between the type of personnel manager and the satisfaction with the personnel selection process was moderated by the applicant's perception of procedural justice. This study was conducted using a between-group design with 208 students from a four-year university in Korea. One group watched a video in which a human personnel manager selected employees and the other group watched a video in which an AI personnel manager selected employees. Participants were randomly assigned to a condition, responded to a demographic questionnaire, and answered measures of procedural justice and satisfaction with personnel selection after watching the video. As a result, the selection process satisfaction was significantly higher when the human personnel manager conducted the selection process than when the AI personnel manager conducted such process. In addition, when procedural justice was perceived as low, there was a significant difference in satisfaction between human and AI groups. However, when procedural justice was perceived as high, there was no significant difference in satisfaction between the two groups. Based on study results, the significance and limitations of this study and suggestions for future studies are discussed.
박세은(Seeun Park),고 선(Sun Go) 한국경제발전학회 2018 經濟發展硏究 Vol.24 No.4
이 논문에서는 자녀 연령 변화가 기혼여성의 노동공급에 어떻게 영향을 미치는지에 대해 노동패널 1~19차 자료를 이용하여 콕스비례위험모형으로 분석 했다. 연구 결과에 따르면 자녀의 연령은 기혼여성의 경력단절과 경력복귀에 긴밀하게 영향을 미쳤다. 미취학연령대 자녀가 있으면 경력단절 위험이 높았 고, 특히 출산 직후 만 0세 자녀가 있으면 취업 후 경력단절 확률이 두 배 이상 상승했다. 경력단절을 경험한 여성의 절반 이상이 경제활동에 다시 참여 했지만, 자녀 연령이 만 0세, 1세, 3세일 경우 여성의 경력복귀 확률이 낮아 졌다. 조사기간 동안 출산을 경험한 여성 표본에 대한 분석 결과에 따르면 자녀가 만 9세가 되면 여성의 경력복귀 확률이 증가했다. 이러한 분석 결과는 여성의 경력단절을 줄이고 경력복귀를 지원하기 위한 정책을 설계할 때 자녀 연령에 따른 여성의 노동공급 행동변화를 고려할 필요가 있음을 시사한다. We study the effect of children’s age on their mother’s labor supply using the Korean Labor and Income Panel Study data. The result from an analysis using the Cox Proportional Hazard model shows that children’s age is closely related with their mother’s career interruption and return. A woman’s hazard rate of career interruption increases when she has a child younger than the school-entry age. The existence of a child whose age is less than one raises the hazard rate of career interruption more than twice. When a child is 0, 1, and 3 years old, the mother’s hazard of career return decreases significantly. Once a child’s age becomes 9, the mother’s hazard of career return rises. The findings imply that policy to reduce women’s career interruption and to help their career return should consider changes in women’s labor supply behaviors caused by their children’s ages.
Jeong, Jiwoon,Kim, Seeun,Park, Changhoon,Park, Kee Hwan,Kang, Ikjae,Park, Su-Jin,Chae, Chanhee BMJ Group Group Ltd 2018 The Veterinary record Vol.182 No.17
<P>This study evaluated porcine reproductive and respiratory syndrome virus (PRRSV)-2 modified live virus (MLV) vaccine against heterologous single and dual challenge of Korean PRRSV-1 and PRRSV-2. Pigs were administered PRRSV-2 MLV vaccine intramuscularly at 21 days of age and inoculated intranasally with both genotypes at 56 days of age. Vaccination of pigs with PRRSV-2 MLV vaccine resulted in reduction of viral loads of both PRRSV-1 and PRRSV-2 after heterologous single and dual challenge with PRRSV-1 and PRRSV-2. In addition, pigs vaccinated with PRRSV-2 MLV vaccine exhibited higher frequencies of PRRSV-1 and PRRSV-2 specific interferon-i secreting cells (IFN-gamma-SC) and showed a significant reduction in lung lesions and PRRSV nucleic acid within the lung lesions after single and dual challenge compared with unvaccinated challenged pigs. Taken together these results demonstrated that vaccination of pigs with PRRSV-2 is efficacious in protecting growing pigs from respiratory disease against heterologous single and dual PRRSV-1 and PRRSV-2 challenge.</P>