• Electrical & Electronic Materials
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• v.7 no.6
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• pp.462-472
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• 1994

In this paper, electron drift velocity is experimentally measured in SF$_{6}$+N$_{2}$ Gas by induced cur-rent method and quantitaive production of electron transport coefficient is calculated by backward-prolongation of Boltzmann equation. Then electron energy distribution function and attachment coefficients are calculated. This paper can use the electron drift velocity by experimentally and the electron transport coefficient by calculated as a basic data of mixed Gas by comparing and investigating.g.

• Journal of Fisheries and Marine Sciences Education
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• v.22 no.2
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• pp.205-217
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• 2010

This study attempted to investigate the influence of psychological separation and parental attachment of school resilience of middle school students. Although six hundred forty two middle school students participated in this study, final subjects of this study were 492(male, 243; female, 249) ones. Participants completed Psychological Separation Inventory, Parental Attachment Inventory and School Resilience Scale. Collected data were statistically analyzed using t-test, product moment correlation coefficient and multiple regression. The results of analyses revealed psychological separation statistically significantly predicted school resilience of middle school students and parental attachment statistically significantly predicted school resilience of middle school students. Based upon above results, it is concluded that psychological separation and parental attachment can be useful protective factors for school resilience. The implications of these results were discussed and future research questions were suggested with several comments on limitations of this study.

• Women's Health Nursing
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• v.19 no.3
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• pp.142-152
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• 2013

Purpose: The Purpose of this study was to investigate relationships between maternal fetal attachment and state anxiety for pregnant women in preterm labor. Methods: The subjects consisted of 56 pregnant women in preterm labor on C hospital. The data were analyzed using SPSS computer program that includes descriptive statistics, mean, standard deviation, t-test, ANOVA, Scheffe? test and Pearson correlation coefficient. Results: Age distribution was 30~39 years of age. Mean score of maternal fetal attachment was 91.50. The group whose planned pregnancy was highest showed higher maternal fetal attachment. The primigravida group showed high maternal fetal attachment. Most frequently practiced attachment item was: "I'm really looking forward to seeing what the baby looks like". The next was was: "I enjoy watching my tummy jiggle as the baby kicks inside". There was no difference in degree of anxiety by general and obstetrical characteristics. There was statistically significant of negative correlation between maternal fetal attachment and state anxiety for pregnant women with preterm labor. Conclusion: Findings provide useful information for further studies in reducing anxiety and intervention programs relating to pregnancy and preterm labor. To increase maternal fetal attachment of pregnant women with preterm labor, it is necessary to standardize prenatal education program.

• The Journal of Korean Academic Society of Nursing Education
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• v.15 no.2
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• pp.302-310
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• 2009

Purpose: The purpose of this study was to examine the attachment of middle school students to their parents, their self-control, problem behavior, and the mediating effect of self-control on the relationship between parent-adolescent attachment and problem behavior. Method: Data were collected by questionnaires from 467 students in middle schools from May 19 to 30, 2008. Data were analyzed by Pearson's correlation coefficient and multiple regression procedures. Result: 1. The students investigated received a mean score of 2.76 and 3.01 on attachment for fathers and mothers respectively. They received a mean score of 3.32 on self-control. The most prevalent self-perceived problem behavior among the students was going home late at night without permission followed by bullying friends for no reason and drinking. 2. Among parent-adolescent attachment, self-control and problem behavior, parent-adolescent attachment had a positive correlation to self-control and a negative correlation to problem behavior. 3. Self-control had a mediating effect on the relationship between parent-adolescent attachment and problem behavior. Conclusion: Parent-adolescent attachment influenced problem behavior through the mediating effect of self-control, and is expected to lay the foundation for the prevention of adolescent problem behavior.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.60 no.1
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• pp.27-31
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• 2011

In this paper, the electron transport characteristics in $CF_4$ has been analysed over the E/N range 1~300[Td] by a two-term approximation Boltzmann equation method and by a Monte Carlo simulation. The motion has been calculated to give swarm parameters for the electron drift velocity, longitudinal diffusion coefficient, the ratio of the diffusion coefficient to the mobility, electron ionization and attachment coefficients, effective ionization coefficient, mean energy, collision frequency and the electron energy distribution function. The electron energy distribution function has been analysed in $CF_4$ at E/N=5, 10, 100, 200 and 300[Td] for a case of the equilibrium region in the mean electron energy and respective set of electron collision cross sections. The results of Boltzmann equation and Monte Carlo simulation have been compared with experimental data by Y. Nakamura and M. Hayashi. The swarm parameter from the swarm study are expected to serve as a critical test of current theories of low energy electron scattering by atoms and molecules, in particular, as well as crucial information for quantitative simulations of weakly ionized plasmas.

• Journal of Engineering Education Research
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• v.13 no.5
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• pp.8-14
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• 2010

This study intends to study about the blade performance loss occurred due to the variation in the shape of an airfoil from attachment/non-attachment of an erosion shield for the hovercraft. The model in this study has used NACA44XXseries, has designed NACA44XX-series by using the Auto CAD, and it designed the shape that has attached an erosion shield to this model according to the thickness and length. By using these models, a grid was generated by GAMBIT and the lift coefficient ($C_l$) and the drag coefficient ($C_d$) were calculated FLUENT code for flow analysis. Through this, the $C_l$ and $C_d$ have calculated and compared the lift-to-drag ratio that an indicator of airfoil performance according to the shape and attachment/non-attachment of erosion shield.

• Journal of Advanced Marine Engineering and Technology
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• v.33 no.7
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• pp.1017-1025
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• 2009

This study intends to study about the blade performance loss occurred due to the variation in the shape of airfoil from the attachment/non-attachment of blade erosion shield for hovercraft. This study model has used NACA 4412, has designed NACA 4412 by using Auto CAD and designed the shape that has attached an erosion shield to this model according to the thickness and length. By using these models, we have generated a grid by using GAMBIT and calculated the lift coefficient (Cl) and drag coefficient (Cd) by using the FLUENT code for flow analysis. Through this, we have calculated and compared the lift-to-drag ratio that is an indicator of airfoil performance according to the shape and attachment/non-attachment of erosion shield.

• The Journal of Korean Society for School & Community Health Education
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• v.14 no.1
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• pp.37-47
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• 2013

Objectives: A descriptive correlational study was designed to examine the relationship of anger to psychosomatic symptoms. In addition, this study investigated the mediating effect of parental attachment in relation to anger and other variable. Methods: Data were collected from 112 subjects in grade 4 or 6, and descriptive statistics, Pearson correlation coefficient, and hierachical multiple regression were used with SPSS/PC 18.0 program to analyze the data. Results: There was a significantly positive effects between state-trait anger and psychosomatic symptoms. Father attachment negatively correlated state-trait anger and psychosomatic symptoms. Also, mother attachment negatively correlated state anger and psychosomatic symptoms. However, maternal attachment was not significantly associated with trait anger. Parental attachment had a significant mediating effect in relation to state-trait anger and psychosomatic symptoms. Conclusions: For the effective management of multi-cultural children's psychosomatic symptoms, programs including parental attachment increasing strategies should be established. These programs can increase parental attachment security which is mediator role between anger and psychosomatic symptoms.

• Child Health Nursing Research
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• v.16 no.2
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• pp.156-163
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• 2010

Purpose: This descriptive correlational study was designed to examine the relationship of attachment security to social anxiety and depression. In addition, the mediating effect of self competency in relation to attachment security and the other variables was investigated. Methods: Data were collected from 194 students in grade 5 or 6, and descriptive statistics, Pearson correlation coefficient, and hierachical multiple regression were used with SPSS/PC 12.0 program to analyze the data. The instruments used were Kerns, Klepac and Cole's Security Scale, La Greca & Stones' Revised Social Anxiety Scales for children (SASC-R), Cho and Lee's Korean form of Kovacs' children's Depression Inventory (CDI) and Harter' Self-perception Profile for Children. Results: There were significantly negative effects between attachment security and the variables, social anxiety and depression. Also, self competency was negatively correlated with social anxiety and depression. Self competency had a significant mediating effect on the relation of social anxiety and depression to attachment security. Conclusion: For the effective management and prevention of social anxiety and depression in school-aged children, programs including strategies to increase self competency should be developed. These programs can increase self competency which has a mediator role between attachment security and the other variables (social anxiety and depression).

• Child Health Nursing Research
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• v.17 no.3
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• pp.167-173
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• 2011

Purpose: This study was conducted to compare the postural habits, body image, and peer attachment of adolescents with idiopathic scoliosis and healthy adolescents, and to examine the correlation between body image and peer attachment in each group. Methods: Eighty-three adolescents with idiopathic scoliosis and 83 healthy adolescents were recruited from 4 middle schools located in W city. Data were collected from November 22 to December 6 2010 using a structured questionnaire including items about postural habits, body image, and peer attachment. Data were analyzed using descriptive statistics, $X^2$-test, independent t-test and Pearson Correlation Coefficient. Results: Compared to healthy adolescents, adolescents with idiopathic scoliosis were more likely to use one hand, to lean back while seated, and to put weight on one leg while standing. The score for body image was significantly lower for adolescents with idiopathic scoliosis compared to healthy adolescents, but peer attachment was not significantly different between the two groups. Body image was significantly correlated with peer attachment only for the adolescents with idiopathic scoliosis. Conclusion: Interventions to promote balanced postural habits in adolescents with idiopathic scoliosis are needed. Information on body image and peer attachment for these adolescents should also be considered when developing interventions.