• Korean Journal of Childcare and Education
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• v.13 no.6
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• pp.111-126
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• 2017

Objective: The purpose of this study is to investigate the moderating role of Ego-Resilience between Peer Attachment and Mobile Phone Dependency in late adolescence. Methods: The participants were 2056 third year high school adolescents (1,041 boys and 1,015 girls) from the Korea Youth Panel Study (KYPS), a national representative of Korean Children and adolescence. Hierarchical Regression was used for data analysis. Results: First, the correlation between peer attachment, ego-resilience and mobile phone dependency were all significant. Second, ego-resilience takes the role of moderator for mobile phone dependency. In detail, ego-resilience relieves the mobile phone dependency caused by 'peer relationships' or 'conflict in peer relationships. Conclusion/Implications: Ego-resilience was found to control the relationship between peer attachment and mobile phone dependency. Therefore, in order to lower the dependence of mobile phones in adolescents with low peer attachment, a program that can enhance ego-resilience is needed.

• Korean Journal of Child Studies
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• v.37 no.1
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• pp.17-36
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• 2016

Objective: Taking note of the fact that North Korean refugee children experience frequent separation from their mothers and long-term maternal deprivation during their childhood, this study examined the relationship between children's separation experiences and attachment. Methods: A total of 37 children aged from 5 to 9 were assessed on their attachment using the Separation Anxiety Test, and their mothers reported on their child's separation experiences. Results and Conclusion: The major findings of this study were as follows: first, the result of evaluating their attachment pattern showed North Korean refugee children had a high level of insecure attachment with a high tendency for avoidant attachment. This avoidant attachment tendency is probably due to growing up in a repressed emotional environment by frequently experiencing maternal separation in North Korea, China, and even after settling down in South Korea. Second, children's secure attachment level was higher if they did not experience separation from their mother, if their mother had a high level of education in South Korea, or if they lived with a big family.

• Korean Journal of Child Studies
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• v.37 no.5
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• pp.5-18
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• 2016

Objective: Sex differences in attachment types are absent during early childhood, but emerge in middle childhood. Prior research has shown that boys classify as more often avoidant than ambivalent. The purpose of this study was to investigate marked sex differences in the distribution of attachment types in middle childhood, especially in boys. Methods: Attachment was assessed with the Separation Anxiety Test in a sample of 208 boys in Grades 3 and 4. Their socioeconomic backgrounds and developmental histories were also collected. Results: The distribution of attachment types was differed from those in early childhood, with insecure boys more often avoidant (31.3%) than ambivalent (7.2%). Insecure-avoidant boys were rated as over 10% compared the global distribution. Conclusion: These results supported the hypothesis of adrenarche in middle childhood. Boys may be changed to have more avoidant types in attachment.

• Journal of Environmental Health Sciences
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• v.24 no.2
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• pp.104-109
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• 1998

The objective of this study was to examine the effect of polymer coating on the initial microorganism attachment and the biofilm growth. Such as nonion(polyacrylamine), anion(CMC-Na) and cation polymer coagulant(chitosan and PEI) were used for coating material of the support carrier(acryl plate). When polymer coagulant was coated with 5, 10, 20, 35, 50, 100 and 200 mg/l on the surface of acryl plate, initial microorganism attachment increased and optimum concentration for the attachment was 35 mg/l. Biofilm growth experiments were conducted with the substrate loading of 12.7gSCOD/$m^2\cdot$ day using RBC. The polymer coagulants such as CMC-Na, polyacrylamide, PEI and chitosan coating on the acryl plate facilitated the biofilm growth of microorganisms. Until the biofilm dry weight grows up to 0. 0038g/cm$^2$, biofilm growth on the plate coated with cation polymer like chitosan was better than that on the coated plate of nonion(polyacrylamine), anion(CMC-Na) polymer coagulant.

• Korean Journal of Childcare and Education
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• v.13 no.4
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• pp.37-51
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• 2017

Objective: The purpose of this study was to examine the effects of child abuse, children's peer attachment and self-esteem on children's depression/anxiety. In addition, the mediating role of children's peer attachment and self-esteem between child abuse and children's depression/anxiety was investigated. Methods: Using the data of 396 children in grades 4~6 from the Korean Welfare Panel Study (2015), this study was conducted by applying Structural Equation Modeling (SEM). Results: The results of this study were as follows. First, child abuse had a direct influence on children's depression/anxiety, and self-esteem. Second, children's self-esteem had a direct influence on depression/anxiety. Third, children's self-esteem had mediating effects on the relationship between child abuse and children's depression/anxiety. Fourth, children's peer relationships had a direct influence on self-esteem. But, children's peer attachment did not have a direct influence on depression/anxiety. The effect of children's peer attachment on their depression/anxiety was partially mediated by children's self-esteem. Conclusion/Implications: In conclusion, child abuse, children's peer attachment and self-esteem have a direct or indirect impact on the depression/anxiety of children.

• Korean Journal of Child Studies
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• v.37 no.4
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• pp.1-15
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• 2016

Objective: The purpose of this study was to explore the influences of maternal attitude toward child emotional expressiveness, young child attachment stability, and emotion regulation ability on problematic behaviors. The participants of this study consisted of 279 children (age 5), and their mothers, and 48 teachers. Methods: The data was analyzed by means of t -test, Pearson correlation, confirmatory factor analysis, and SEM analyses. Results and Conclusion: The major findings were as follows. First, higher maternal attitude toward child emotional expressiveness was associated with better child attachment stability. Second, higher child attachment stability was associated with better child emotion regulation at home and lower problematic behavior. Third, higher child emotion regulation at home and in the classroom was associated with lower problematic behavior. Fourth, maternal attitudes toward child emotional expressiveness directly impacted levels of problematic behavior. Fifth, child emotional regulation fully mediated the effect of attachment stability on problematic behavior.

• Korean Journal of Child Studies
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• v.37 no.3
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• pp.83-93
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• 2016

Objective: This study examined that general characteristics such as gender, age, period of stay at an institution, size of facility, and temperament and attachment affect young children's development under institutional care. Methods: A total of 94 young children (ages 2-4years), who live in 32 institutions in Seoul were assessed on their development using the Korean-Age & Stage Questionnaire. Pearson productmoment correlation analysis, and multiple regression analyses were used for data analysis. Results: The major findings of this study were as follows: first, a longer period of stay at an institution had more positive effects on the development of communication. Facilities with more than 60 children had lower communication, gross motor, and fine motor development compared to facilities with less than 60 children. Second, social temperament had positive effects on communication, problem solving, and personal-social development. Emotional temperament had no effects on all development areas. Third, attachment had positive effects on all development areas. Lastly, social temperament and attachment had interactive effects on communication, gross motor, problem solving, and personal-social development. Conclusion: These results imply that caretakers in institutions should give developmental mediation services for considering temperament and facilitation of attachment.

• Korean Journal of Child Studies
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• v.37 no.1
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• pp.95-108
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• 2016

Objective: The purpose of this study was to examine the mediating effect of internet use type on the relationship between parental attachment and school life adjustment. Methods: For this study, data were drawn from 4th wave panel data of Korea Children and Youth Panel Survey. 1,537 1st graders of middle school were used for analysis. Results: The results of this study were summarized as follows. First, adolescents' parental attachment positively influenced school life adjustment. Second, study oriented internet use positively influenced school life adjustment. However, entertainment oriented internet use negatively influenced school life adjustment, and relation oriented internet use did not influence school life adjustment. Third, study and entertainment oriented internet use mediated parental attachment and school life adjustment. However, relation oriented internet use did not mediate parental attachment and school life adjustment. Conclusion: The discovery that study oriented internet is a factor that can improve school life adjustment carries a significant meaning. Based on the results, some implications are discussed to improve school life adjustment in early adolescence.

• 제어로봇시스템학회:학술대회논문집
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• 1996.10b
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• pp.151-155
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• 1996

To automate an excavator the control issues resulting from environmental uncertainties must be solved. In particular the interactions between the excavation tool and the excavation environment are dynamic, unstructured and complex. In addition, operating modes of an excavator depend on working conditions, which makes it difficult to derive the exact mathematical model of excavator. Even after the exact mathematical model is established, it is difficult to design of a controller because the system equations are highly nonlinear and the state variable are coupled. The objective of this study is to design a multi-layer neural network which controls the position of excavator's attachment. In this paper, a dynamic controller has been developed based on an error back-propagation(BP) neural network. Computer simulation results demonstrate such powerful characteristics of the proposed controller as adaptation to changing environment, robustness to disturbance and performance improvement with the on-line learning in the position control of excavator attachment.

• Journal of the Korean Home Economics Association
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• v.26 no.1
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• pp.163-177
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• 1988

The purpose of this study was to investigate the supporting-attitude type of the eldest son and his wife living seperately from his parents. This research focused on the various degree of intergenerational solidarity between the eldest son and his wife and his parents. For this study, the supporting-attitude types were classified into 4 types: these combine 2 types of residence (living together with the parents or living seperately from the parents) with 2 types of financial support (with with-out financial support0. The concept of intergenerational solidarity, comprises three elements: objective solidarity, subjective solidarity (attachment and conflict), and consensual solidarity (filial obligation). The subjects of this study were 166 couples living seperately from son's parents in Seoul city. The data were analyzed by multiple discriminant analyses, one way ANOVA's, and the paired t-test. The results of this study are as follows; 1. Although the majority of the eldest sons live now away from the parents home, they expect to eventually live together with and support their parents financially. The majority of the wives, however, do not want to live together with their husbands' parents even though expecting to support them financially. 2. According to the discriminant analyses, the supporting-attitude types of the eldest sons were discriminated by attachment and conflict, and those of their wives by conflict and obligation. 3. There were significant difference between supporting-attitude types in terms of intergenerational solidarity. In general, the couples expecting to live together with the parents reported a higher degree of attachment, a stronger sense of obligation, and a lower degree of conflict than the couples expecting to live seperately from the parents. 4. Significant differences between the husbands and the wives were found in attachment, obligation, and conflict. While the husbands showed higher attachment and obligation than their wives, the wives showed higher conflict than the husbands. No significant difference, however, was found between the couples in objective solidarity.