• Child Health Nursing Research
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• v.25 no.3
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• pp.245-254
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• 2019

Purpose: The purpose of this study was to obtain research-based evidence on the relationships among general characteristics, family strength, self-control, and happiness among late school-aged children using a correlational research design. Methods: The participants were 172 fifth- and sixth-grade students from two public elementary schools. Data were collected by employing structured questionnaires, including the Korean Family Strengths Scale for Strengthening Family II, a self-control scale, and a happiness scale. Data analysis was conducted using SPSS version 23.0. Results: The level of happiness of late school-aged students showed significant correlations with family strength (r=.78, p<.001), and self-control (r=.59, p<.001). Family strength had a significant positive correlation with self-control (r=.55, p<.001). The factors with a significant impact on participants' happiness were family strength (${\beta}=.63$, p<.001), self-control (${\beta}=.21$, p<.001), exercise frequency, and self-perceived health. The total explanatory power of the model was 69%, and the explanatory power of family strength for the level of happiness was 61%, showing that the family strength was the most important factor that promoted happiness in late school-aged students. Conclusion: These findings imply that improving family strength is an important aspect of promoting happiness among late school-aged children. Interventions to strengthen late school-aged children's self-control are also necessary.

• Proceedings of the Korea Concrete Institute Conference
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• 2004.05a
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• pp.204-207
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• 2004

In this paper, mechanical properties of the high strength lightweight self-compacting concrete with simple mixed design method was investigated. Experimental tests were performed as such compressive strength, splitting tensile strength, modulus of elasticity and density of high strength lightweight self-compacting concrete. The 28 days compressive strength of high strength lightweight self-compacting concrete with the LC replacement ratio of $100\%$ reduces about $31\%$ but LF replacement ratio of $100\%$ increase about $20\%$ compared that of the control concrete. The structural efficiency of high strength lightweight self-compacting concrete increase with proportional to the replacement into of LF. The relationship between the splitting tensile strength and 28 days compressive strength can be represented by the equation $f_s=0.076f_{ck}+0.5582$. The modulus of elasticity was found to be lower than that of normal weight concrete, ranging form 24 to 33 GPa.

• Journal of Families and Better Life
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• v.22 no.1
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• pp.115-127
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• 2004

This study was conducted to find out general status of family strength and self-esteem perceived by adolescent children. The major findings are as follows: 1 ) Adolescent children generally perceived their families as strong. Important factors that affected family strength were parents' level of education, economic status, father's religion, and parents' marital status. 2) Adolescents also evaluated their self-esteem positively, in general. Family type, father's level of education, economic status, father's religion, parents' marital status and mother's employment outside home were important factors that influenced adolescents' self-esteem. 3) The family strength and self-esteem as perceived by adolescents were positively correlated. That is, the more highly the adolescents estimated their family strength, the more likely they had high self-esteem.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2020.11a
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• pp.21-22
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• 2020

This study is about high strength self-leveling mortar according to the mixing ratio of polymer. The self-leveling mortar currently released in Korea maintains a compressive strength of 40 Mpa as of 28 days. In addition, the level of bonding strength and flexural strength are kept the same. However, through this study, it is confirmed how the self-leveling mortar with a compressive strength of 60Mpa as of the 28th is shown according to the amount of polymer mixed. Experimental factors were configured according to the amount of polymer mixed, and the types of experiments were to confirm compressive strength, flexural strength, adhesion strength and flow. In addition, by confirming the early strength, a study was conducted to improve the quick workability compared to the self-horizontal mortar in the market.

• Korean Journal of Human Ecology
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• v.24 no.4
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• pp.499-511
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• 2015

The purposes of this study were to examine the general levels of family strength, self-determination and life satisfaction perceived by university students. Also, this study aimed to verify the mediating effect of self-determination between family strength and life satisfaction. The subjects of this study were 350 university students in Korea and surveyed by self-reported questionnaires. The data was analysed by descriptive statistics, correlation, regression analysis, and Sobel test using SPSS 20.0. The results of the analysis were as follows. First, the levels of family strength, self-determination, life satisfaction perceived by university students were found to be higher than the middle score. Second, in the process of verification for seeking mediating effect of students' self-determination between family strength and life satisfaction, step1 showed that family strength revealed significant effects on life satisfaction level(${\beta}=.62$, p<.001). And in step2, family strength affected students' self-determination significantly(${\beta}=.47$, p<.001). Step3 which used family strength(${\beta}=.33$, p<.001) and self-determination(${\beta}=.62$, p<.001) together showed that self-determination had mediating effects between family strength and life satisfaction of students. It was proved significantly by Sobel test(Z=8.83, p<.001). Therefore, in order to enhance life satisfaction of university students, integrative services and systematic intervention programs as family education are required.

• Korean Journal of Materials Research
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• v.5 no.2
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• pp.191-196
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• 1995

Self-bonding strength developed at the interface of amorphous PEEK films is highly sensitive to the processing variables(time, temperature, and pressure) during the bonding process. In order to examine the effects of these processing variables, amorphous PEEK films were bonded at various bonding conditions and the resultant interfacial bond strengths were measured using a modified single lap-shear test. Experimental results showed that the developed self-bonding strength increases with increase in bonding temperature and is directly proportional to the bonding time raised to the 1/4 power. The applied pressure seems only to produce better wetting at the beginning stage of the bonding process. Conclusively, the self-bonding of amorphous PEEK films provides a great potential for developing excellent bond strength approaching the strength of the parent material without any adhesives in structural applications.

• Journal of muscle and joint health
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• v.15 no.2
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• pp.130-139
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• 2008

Purpose: The purpose of this study was to examine the effect of Tai Chi exercise on muscle strength, grip strength, flexibility, pain, depression and self-efficacy in patients with osteoarthritis. Method: With a quasi-experimental design, 46 persons with osteoarthritis were assigned into an experimental group (n=22) or a control group (n=24). Muscle strength, grip strength, flexibility, pain, depression and self-efficacy were measured both before and after the exercise. Data were analyzed with SPSS WIN using descriptive statistics, t-test, and ANCOVA. Results: The mean age of the subjects was 68 years in the experimental group and 64 years in the control group. After controlling for age and pre-test outcome variables, muscle strength scores (F=-14.8, p= .00), grip strength scores (Rt: F=8.40, p= .01), and self-efficacy (F=47.3, p= .00) improved more in the experimental group than the control group. Joint pain scores (F=15.0, p= .00) and depression scores (F=14.7, p= .00) decreased in the experimental group. Conclusion: Tai Chi exercise is likely to be an effective nursing intervention to improve muscle strength, grip strength, and self-efficacy and reduce pain and depression for patients with osteoarthritis.

• Journal of Family Resource Management and Policy Review
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• v.16 no.3
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• pp.53-65
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• 2012

This study analyzes the relation between family strength, self-efficacy and career maturity of college students. The results from the study are based on surveys, using a questionnaire method, undertaken by students from the Jeonnam area. Data was analyzed using the SPSS 19.0 program and the statistics used for analysis were t-Test, ANOVA, Correlation and Regression. The study found the following results. First, the family strength of the subjects was above average. Second, family strength, self-efficacy, and career maturity showed differences in terms of gender, major satisfaction, career counselling and major area. Third, the correlation among family strength, self-efficacy, and career maturity were observed positively in almost all sub-categories. Forth, the effects of family strength on self-efficacy and career maturity were significant. Based on these results, it is suggested that family strength should be enhanced to improve self-efficacy and career maturity of college students.

• Journal of the Korea institute for structural maintenance and inspection
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• v.24 no.1
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• pp.67-73
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• 2020

In this study, the self-healing performance of mortar beams containing self-healing materials was evaluated through experiments. Normal mortar beams and self-healing mortar beams were used In the experiments. The self-healing performance was evaluated by comparing the mortar compressive strength, member strength, and self-healing effects of cracks. The experimental results showed that the compressive strength of mortar containing self-healing material was smaller than that of normal mortar, but the ratio of 118 days compressive strength to 28 days compressive strength was the same. The member strength tended to increase with increasing curing period. In normal mortar specimens, the member strength did not recover even if the curing period increased, but the strength of the self-healing mortar specimens tended to recover as reaction products were produced. The crack width tended to decrease after the healing periods in both specimens, but the reaction product was observed only in the self-healing mortar specimens.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.16 no.1
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• pp.30-38
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• 2009

Purpose: This randomized study was done to compare the effects of a 6 month Tai Chi exercise and a self-help program on balance, flexibility and muscle strength in women with osteoarthritis (OA). Method: In this experimental study, 82 women with OA recruited from outpatient clinics or community health centers were randomly assigned either to a Tai Chi group or a self-help group. Thirty women (mean age = 62 years) in the Tai Chi group and 39 (mean age = 59 years) in the self-help group completed posttest measures (balance, flexibility, oxygen consumption, abdominal muscle strength, back muscle strength, and grip strength) at 6 months. Results: After the 6 month, Tai Chi participants had significantly greater balance (mean difference = 2.9 vs. 0.9 for the self-help), grip strength (mean difference = 4.6 vs. 0.9 for the self-help), and back muscle strength (mean difference = 4.1 vs. -0.3 for the self-help). However, flexibility, oxygen consumption, and abdominal muscle strength were not significantly different between the groups. Conclusion: Tai Chi increased balance, grip strength and back muscle strength in older women with osteoarthritis compared to the self-help program. Whether these changes improve physical functioning and fall prevention requires further study.