• 한국직업건강간호학회지
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• 제27권3호
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• pp.171-179
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• 2018

Purpose: The purpose of this study was to examine the mental health and presenteeism of early childhood teachers and to explore the effects of working conditions and job satisfaction on these. Methods: Data from the 4thKorean Work Environment Survey were used. The sample consisted of 474 female early-childhood teachers from private facilities. Mental health was measured using the WHO-Wellbeing Index. Presenteeism was attributed to a participant upon indication that, during the past 12 months, she had ever attended work, despite being sick. The data by complex sample design were analyzed through the Rao-Scott $x^2$ test and logistic regression analysis. Results: 37.9% of early childhood teachers reported poor mental health and 34.2% had experienced presenteeism. Early childhood teachers in permanent employment, who did not work evening shifts, and with sustainable jobs, were more likely to have better mental health. Moreover, those in permanent employment and remunerated appropriately were less likely to experience presenteeism. Conclusion: Type of employment, number of days working in the evening, and job sustainability affect mental health. Further, type of employment, number of workers, and being well paid have an effect on presenteeism. We suggest that improved working conditions should precede the improvement of early-childhood teachers' mental health.

• Journal of Nutrition and Health
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• 제31권1호
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• pp.5-12
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• 1998

This study was designed to examine how dietary protein levels affect organ growth and protein metabolism in early and normally weaned rats. Early and normally weaned rats separated fro the dam on the 15th and 121st day postpartum, respectively. were fed diets containing three levels of protein : low(10%) , normal (20%),and high(40%) . On the 35th day, the weight and DNA, RNA and protein contents in brain , liver, and kidney were determined to ascertain organ and cellular growth. Furthermore, serum total protein , albumin , $\alpha$-amino N and creatine and urinary urea N, and creatinine were determined in order to ascertain protein metabolism and renal functions. Dietary protein levels were not observed to significantly affect total DNA content, which may represent an index of cell number in the liver, brain and kidney. Fresh weight and protein/DNA ratio, which may represent indices of cell size, significantly increased in proportion to dietary protein in the kidney. As for the early weaned rats , the liver cell size significantly decreased. Dietary protein levels and weaning periods did not affect serum total protein and albumin . However, serum urea-N significantly increased in proportion to dietary protein levels whereas serum $\alpha$-amino N was decreased by early weaning . Nitrogen retention was lower in early weaned rats fed low or high levels of protein than in normally weaned rats. The results demonstrate that low or high levels of dietary protein have less desirable effects on protein metabolism in prematurely weaned rats.

• Nuclear Engineering and Technology
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• 제44권7호
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• pp.745-754
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• 2012

The correlations between Large Early Release Frequency (LERF) and Early Fatality need to be investigated for risk-informed application and regulation. In Regulatory Guide (RG) -1.174, while there are decision-making criteria using the measures of Core Damage Frequency (CDF) and LERF, there are no specific criteria on LERF. Since there are both huge uncertainties and large costs needed in off-site consequence calculation, a LERF assessment methodology needs to be developed, and its correlation factor needs to be identified, for risk-informed decision-making. A new method for estimating off-site consequence has been presented and performed for assessing health effects caused by radioisotopes released from severe accidents of nuclear power plants in this study. The MACCS2 code is used for validating the source term quantitatively regarding health effects, depending on the release characteristics of radioisotopes during severe accidents. This study developed a method for identifying correlations between LERF and Early Fatality and validates the results of the model using the MACCS2 code. The results of this study may contribute to defining LERF and finding a measure for risk-informed regulations and risk-informed decision-making.

• 한국보육지원학회지
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• 제18권6호
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• pp.21-36
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• 2022

Objective: The present study examined long-term effects of media use during early childhood on grit in middle childhood, focusing on the mediating role of attention problems. Methods: For statistical analysis, the 6th, 7th, and 11th data sets from the Panel Study on Korean Children were used. A total of 1,352 cases were finally selected. Descriptive statistics analysis, correlation analysis, path analysis, and bootstrapping were conducted. Results: The results showed that the use of media for educational purposes in early childhood did not have a significant effect on attention problems and grit. However, when the media use time for play in early childhood was longer, levels of attention problems in early childhood were higher and levels of grit in middle childhood were lower. The mediating effect of attention problems on the relationship between media use time for play of young children and grit of middle childhood was significant. Conclusion/Implications: Findings of the present study suggest that the use of media for play during early childhood needs to be carefully monitored because it can have a negative effect on attention and grit development.

• 아동학회지
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• 제22권4호
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• pp.167-188
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• 2001

This study investigated the relationship of daily life activity experiences to violent behaviors and their moderating effects on the relationship between stress and violent behaviors in early adolescence. A sample of 134 second year middle school students carried electronic watches for one week and provided reports on their objective activity situation and subjective states when signalled at random times. Stress was positively correlated with violent behaviors. Daily activity experiences were correlated with violent behaviors and moderated the relationship between stress and violent behaviors. More time spent in socializing and passive leisure, and negative emotional states during schoolwork and active leisure were correlated with higher violent behaviors. Lower motivational states during schoolwork were correlated with higher violent behaviors. Lower cognition of importance and attention states during schoolwork and higher cognition of importance and attention states during active leisure and maintenance activities were correlated with higher violent behaviors. Finally, the moderating effects of negative emotion during active leisure, motivation and attention states during schoolwork on the relationship of stress with violent behaviors were found among girls only.

• 한국막학회:학술대회논문집
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• 한국막학회 1995년도 춘계 총회 및 학술발표회
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• pp.1-4
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• 1995

The microstructure of polymer membranes produced via thermally induced phase separation (TIPS) of polymer solutions is a strong function of both the early-stage (by spinodal decomposition or nucleation & growth) and the late-stage phase separation (referred to in general as coarsening). In the case of early stage effects, the membrane morphology resulting from a nucleation & growth mechanism is either a poorly interconnecsed, stringy, beady structure which is mechanically fragile or a well interconnected structure with highly nonuniform pore sizes. In contrast, spinodal decomposition results in a well interconnected, mechanically strong membrane with highly uniform pore sizes. Here I describe recent quantitative studies of the coarsening effects on the microstructure of membranes produced via TIPS process. The dependence of microstructure on coarsening time, quench depth, solution viscosity, and polymer molecular weight was investigated in order to distinguish among three possible coarsening mechanisms, Ostwald ripening, coalescence, and hydrodynamic flow, which may be responsible for structural evolution after the early-stage phase Separation (spinodal decomposition or nucleation & growth).

• 대한가정학회지
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• 제42권11호
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• pp.123-136
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• 2004

The Purpose of this study was to investigate the effects of self-efficacy on the early childhood teachers' self-concept and job satisfaction. 191 early Childhood-teachers were surveyed for this study. Spss/pc was run for statistical data analysis. This study abstracted that the most important factors for Early Childhood-teachers to have Self-efficacy are life self, duty, working environment, payment, and promotion opportunity and concluded that the more payment and promotion opportunity, the more Self-efficacy teachers have. In conclusion, this study implies that retraining and teaching programs for teachers need to be accessed variably, considered with the results of this paper.

• International Journal of Oral Biology
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• 제35권4호
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• pp.197-202
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• 2010

Most oral microorganisms exist as biofilms which initiate formation via the attachment of an early colonizer to host proteins on the tooth surface. Fusobacterium nucleatum act as a bridge between early and late colonizers. Dental biofilms eventually comprise dental pathogens such as Porphyromonas gingivalis, Treponema denticola and Tannerella forsythia. To evaluate the effects of mutual interactions between oral bacteria on the growth of biofilms, periodontopathogens were co-cultured with a $0.4\;{\mu}m$ barrier. Streptococcus gordonii inhibited the growth of F. nucleatum and periodontopathogens. However, F. nucleatum, P. gingivalis and T. denticola activated the growth of other bacteria. A co-culture system of early and late colonizers could be a useful tool to further understand bacterial interactions during the development of dental biofilm.

• 한국산학기술학회논문지
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• 제21권12호
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• pp.570-577
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• 2020

본 연구의 목적은 영유아교사의 놀이성, 민감성, 놀이교수효능감 간의 관계를 분석하고 놀이성, 민감성이 놀이교수 효능감에 미치는 영향에 대해 알아보고자 한다. 이를 위하여 본 연구에서는 J도에 소재하고 있는 유치원, 어린이집 18개소에 근무하고 있는 영유아교사 262명을 대상으로 설문 조사를 하였다. 본 연구에 사용된 연구도구는 놀이성 척도, 민감성 척도, 놀이 교수 효능감 척도이며 본 연구에 맞게 수정, 보완하여 사용하였다. 본 연구의 결과를 분석하기 위하여 SPSS 22.0 프로그램을 사용하였으며, 빈도와 백분율, Pearson의 적률상관관계, 중다회귀분석을 통해 자료를 분석하였다. 연구 결과 첫째, 영유아교사의 놀이성, 민감성, 놀이교수 효능감 간에는 정적인 상관관계가 있는 것으로 나타났다. 둘째 영유아교사의 놀이성, 민감성이 놀이교수 효능감에 미치는 영향을 살펴 본 결과 모두 통계적으로 유의한 영향을 미치는 것으로 나타났다. 결론적으로 영유아교사의 놀이성, 민감성, 놀이교수 효능감 간에는 모두 유의미한 상관이 있었으며, 두 변인 모두 유아-교사 상호작용에 영향을 미치는 요인이었으며, 이는 영유아교사가 민감하고 놀이성이 높으면 놀이교수 효능감도 높다라는 것을 확인하였다는 점에서 본 연구의 의의를 찾을 수 있다.

• 한국수정란이식학회지
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• 제9권2호
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• pp.181-188
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• 1994