• Human Ecology Research
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• v.51 no.3
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• pp.341-353
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• 2013

The object of this study is to examine the relationship between temperament (emotionality, activity, sociability, and shyness) and the resilience (social competence and language ability) of preschool children from low-income families and the moderating effect of maternal warmth. The subjects were 86 low-income preschool children (42 girls and 44 boys; mean age, 70.57 months), their mothers and teachers, recruited from five daycare centers in Namyangju city and Ansan city located in Gyeonggi-do area. Each child's language ability was individually assessed with with the standardized measure, Preschool Receptive-Expressive Language Scale (PRES) and their teachers reported on children's social competence and parents reported on their child's temperament by questionnaire. The collected data was analyzed by correlation analysis and hierarchical regression. The main results of this study were as follows. First, children's emotionality in temperament and maternal warmth had main effects on social competence. Second, only monthly income level and sex had main effects on language ability. Third, maternal warmth moderated the effects of children's shyness in temperament on social competence and language ability as resilience. Findings could provide basic information for programs to promote resilience in preschool children from low-income families.

• Korean Journal of Child Studies
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• v.22 no.1
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• pp.51-66
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• 2001

This study investigated whether infant child care experience, alone or in combination with mother/child factors, is associated with attachment security. Participants were forty 12-to 18-month-old infants and their mothers. Infants were observed in the Strange Situation to assess the pattern of infant-mother attachment; the Observational Ratings of the Caregiving Environment was used to assess the caregiving environment. Mothers were interviewed with the questionnaires and observed in the laboratory "living room". There were significant main effects of maternal sensitivity and responsiveness and of stability of care on attachment security and on insecure/avoidance. Significant interaction effects revealed that infants were more likely to be secure when high maternal sensitivity/responsiveness was combined with good quality child care, non-maternal care initiated prior to six months of age, or care by close relatives.

• Asian-Australasian Journal of Animal Sciences
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• v.20 no.1
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• pp.19-24
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• 2007

Covariance components and genetic parameters of weekly live body weight from hatching to six weeks of age and age of sexual maturation were estimated in a laying type Japanese quail line. The univariate and bivariate animal model analysis included hatching group and sex as fixed effects. Each trait was analysed with animal as random effect to fit the additive direct effect. Additional random effects incorporated in the models were changed according to the trait examined. The best model for a trait was chosen based on a likelihood ratio test, comparing the models with and without maternal additive genetic and maternal permanent environmental effects. Heritability estimates of live-weight at hatch and one to six weeks of age with their standard errors were 0.22${\pm}$0.088, 0.39${\pm}$0.099, 0.31${\pm}$0.086, 0.38${\pm}$0.056, 0.46${\pm}$0.055, 0.50${\pm}$0.059, and 0.56${\pm}$0.062, respectively. Direct heritability value of age of sexual maturation was moderate (0.24${\pm}$0.055). The variances due to permanent environmental effect of dam after one week of age and maternal genetic effect after two weeks of age were not important sources of variation. The correlations between direct and maternal genetic effects were negative and ranged from high to moderate values (-0.21 to -0.83). Among the weekly live weights, genetic correlations were generally high between not only successive but also early and late weightings. It suggests that selection for final weight may be based on early weight records. Genetic correlations between age of sexual maturation and live weights were low, favourable but had high standard errors. These results indicate that selection for high weight will potentially result in lower age of sexual maturation only with accurate determination of breeding values.

• Korean Journal of Child Studies
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• v.37 no.5
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• pp.33-52
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• 2016

Objective: This study aimed to investigate the trajectory of maternal parenting stress during infancy according to the employment status of mothers when each year's depression was controlled and examine the longitudinal effects of parenting stress on affective parenting and socioemotional developmental outcomes for preschoolers. Methods: Using latent growth modeling, the first 4 waves of panel data collected from 2,078 mothers and their babies were analyzed. This nationwide data was provided from the 2008 Panel Study on Korean Children, conducted by the Korea Institute of Child Care and Education. Results: First, maternal parenting stress showed a linear increasing pattern, and there were individual differences in intercept and slope. Second, when each year's maternal depression was controlled, the intercept of parenting stress was lower, but the rate of increase was higher. In multiple group analyses, this increasing pattern of parenting stress was significant only in unemployed mothers. Lastly, the increase of unemployed mothers' parenting stress had direct effects on child emotionality and peer interaction and had an indirect effect on child peer interaction (mediated by affective parenting). Conclusion: The current study verified that the longitudinal effects of increasing parenting stress of unemployed mothers on affective parenting and child socioemotional development when maternal depression level was controlled. These results imply that we need to pay more attention to emotional health and resources of unemployed mothers and provide them with social support as well as employed mothers.

• Toxicological Research
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• v.17 no.3
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• pp.225-234
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• 2001

The present study was conducted to investigate the effects of Korean red ginseng water extract (KRGWE) on developmental toxicity caused by the environmental estrogen bisphenol A (BPA) in Sprague-Dawley rats. fifty males successfully mated were randomly assigned to five experimental groups, 1.e., group I (vehicle control), group II (BPA 1000mg/kg), group III (KRGWE 400mg/kg), group IV (BPA 1000mg/kg & KRGWE 200mg/kg), and group V (BPA 1000mg/kg & KRGWE 400mg/kg). The test articles were administered by gavage to mated females from gestational days (GD) 1 through 20 (sperm vaginal lavage=day O). All females were subjected to caesarean section on GD 21 and their fetuses were examined for external, visceral, and skeletal abnormalities. In the group II, significant maternal toxic effects including suppressed body weight, decreased body weight gain during pregnancy, and reduced food consumption were observed in pregnant rats. The minimal developmental toxicity including fetal ossification delay was also found in fetuses. In addition, a tendency for increased pregnancy failure, increased pre-and postimplantation loss, and decreased fetal body weight was observed. However, no fetal morpho-logical abnormalities were seen in surviving fetuses at a dose level of 1000mg BPA/kg. On the other hand, the maternal toxicity and developmental toxicity found in the groups IV and V were comparable to those of the group II. There were no adverse signs of either maternal toxicity or developmental toxicity in the group III. These results showed that administration of BPA at a dose level of 1000mg/kg to pregnant rats resulted in significant maternal toxicity and minimal developmental toxicity, and that no protective effects on BPA-induced maternal toxicity and developmental toxicity were found by concomitant gavage dosing of KRGWE.

• Human Ecology Research
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• v.56 no.6
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• pp.541-553
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• 2018

This study examined the influences of infants' age for the first use of smart devices and the amount of time to use them on the externalizing problem behavior as well as investigated whether maternal managing behavior (setting rules on accessing smart devices and monitoring their child's use of smart devices) had moderating effects. The study participants consisted of 521 three to six year old infants (235 boys and 286 girls). The data were analyzed by means of descriptive statistics and a hierarchical regression. The results of this study indicated that the age at first use of smart devices and maternal managing behavior had significant effects on the externalizing problem behavior of infants. The earlier the infants first used smart devices, the higher the level of externalizing problem behavior. Externalizing problem behavior was also found to be higher when the mothers showed no managing behavior. Second, maternal managing behavior moderated the relation between the age at first use of smart devices and the externalizing problem behavior of infants. The effects of the age at first use of smart devices on the externalizing problem behavior of infants were greater when the mothers did not set rules regarding the use of smart devices and did not supervise children when using smart devices.

• Women's Health Nursing
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• v.7 no.1
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• pp.7-17
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• 2001

The purpose of this study was to evaluate the effects on maternal-fetal attachment and self efficacy for delivery using the Taekyo-oriented prenatal class. This class is for 2 hours/week for 4 weeks. The program covers the contents of fetal growth and development including their responding ability, the importance of the uterine environment, sharing the motive and purpose of pregnancy, sharing experiences about pregnancy, sharing of prejudices against delivery, training of maternal-fetal interaction, understanding delivery, relaxation breathing techniques, maternity exercises, writing letters or prayers to the baby, and declaration of loving the baby. This study took place from March 4th to June 15th, 2000, in a university hospital and community care center, and was done by with a pretest-posttest design, with 55 pregnant women who were within 32-36 weeks pregnant and who agreed to participate in this study. Data was measured twice by self-report by the Cranley's Maternal-fetal Attachment Scale(MFAS, 1981), and the Shin's(1997) Self Efficacy for Delivery Scale at the beginning and at the completion of the class. Data was analyzed by SAS. The study results were: 1. The score of maternal-fetal attachment was significantly increased after the Taekyo perspective prenatal class than before the class. (t=7.389, p=0.000) 2. The score of self efficacy for delivery was significantly increased after the Taekyo perspective prenatal class than before the class. (t=8.885, p=0.000) The above results proved that the present Taekyo perspective prenatal education program was effective in increasing maternal-infant attachment and self efficacy for delivery. Therefore, it is concluded that the existing prenatal class should include Taekyo perspective elements. However, further study is needed to compare the effects with preexisted prenatal class.

• Child Health Nursing Research
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• v.16 no.4
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• pp.239-248
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• 2010

Purpose: This study was done to evaluate effects of a mother-fetus interaction promotion program on maternal and infant sleep/activity regulation, and examine the correlation between maternal and infant sleep/activity. Methods: Thirty-four mother-infant dyads were recruited from an OB-GY clinic with postpartum care center, and assigned to the intervention group (17) or control group (17). Data were collected from January 18 to August 5 2005. A programmed education focused on mother-fetus interaction was provided to the intervention group in the 3rd trimester. Maternal sleep/activity record was completed at 32-36 weeks gestation and infant sleep/activity record was completed for one month after birth. Results: During the 3rd trimester, there were no significant differences in maternal sleep/activity between the groups, except for frequency of mothers' night awakening and urination at night. There were no significant differences in infant sleep, but significant difference was found in feeding times between the groups. Correlation of maternal sleep in the 3rd trimester and infant waking times was significant. Conclusion: The results of this study indicate that maternal sleep/activity during pregnancy influences infant sleep/activity at 3-4 weeks, and that nursing interventions to regulate maternal sleep/activity provided to primiparas can be beneficial to the regularity of infant sleep/activity patterns.

• Journal of Korean Academic Society of Home Health Care Nursing
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• v.6
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• pp.66-77
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• 1999

The purpose of this study was to find the effects of an educational program for primiparas on maternal confidence and continuity of breastfeeding. The subjects of this study were the healthy mothers, and the healthy infants whose weight was more than 2.500gm and gestational age was more than 37 weeks. The final targets were thirty seven mothers-19 of intervention group and 18 of control group. Data were collected from 15th of March to 3rd of September, 1999. To the intervention group, education on infant care and breast feeding were provided before discharge. And that, telephone advice was provided within one week after discharge, and at 2 months postpartum. And that, reeducation and counsel were provided at one month and three months postpartum by home-visiting care for the intervention group. For the control group. home visiting was also conducted only for data collection. Data were analyzed by chi-square test and t-test. The results were as follows: 1. The maternal confidence of the experimental group was higher than that of control group at one month postpartum. but the difference of confidence of these two groups were not significant at three months postpartum. 2. For both of experimental and control groups, maternal confidence significantly increased at three months postpartum than one month postpartum. 3. The rate of breastfeeding of the experimental group was higher than that of control group at one month and two months postpartum (p=.050, p=.049). But the difference was not significant at three months, although experimental group continued breastfeeding more(47.4%) than control group(27.8%). In conclusion, educational program for primiparas of this study was effective in the promotion of maternal confidence and breastfeeding.

• Human Ecology Research
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• v.51 no.4
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• pp.403-412
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• 2013

The purpose of this study was to explore the general tendencies of maternal parenting stress, coping style, marital satisfaction and preschool children's withdrawal behavior as well as to investigate the effects of maternal parenting stress, coping style, and marital satisfaction on preschool children's withdrawal behavior. The participants involved 86 mothers of preschoolers and their teachers from one day care center and two kindergartens in Seoul and Gyeong-gi province. Maternal parenting stress, coping style and marital satisfaction were assessed by the mothers' self-reports, whereas the preschool children's withdrawal behavior was assessed by the teacher's report. The data were analyzed by using descriptive statistics, correlation analysis, t-test and multiple regressions. The collected data was analyzed by SPSS ver. 15.0. The major findings were summarized as follows: There were no differences between maternal parenting stress, coping style and marital satisfaction between mothers of boys and girls. Further, there were differences in preschool children's withdrawal behavior between boys and girls; girls showed more withdrawal behaviors than boys. Typical stress due to parenting, outsider's help coping style and marital satisfaction explained the withdrawal behavior of preschool children. As the level of typical stress increase in mothers, preschool children showed increased withdrawal behavior. Moreover, as mothers used fewer outsider's help coping style and had lower marital satisfaction, their preschool children's showed increased withdrawal behavior. In conclusion, maternal parenting stress, coping style and marital satisfaction significantly influence on preschool children's withdrawal behavior.