• Computers and Concrete
• /
• v.25 no.5
• /
• pp.401-409
• /
• 2020

Artificial neural networks are used as a useful tool in distinct fields of civil engineering these days. In order to control long-term quality of Self-Compacting Semi-Lightweight Concrete (SCSLC), the 90 days compressive strength is considered as a key issue in this paper. In fact, combined artificial neural networks are used to predict the compressive strength of SCSLC at 28 and 90 days. These networks are able to re-establish non-linear and complex relationships straightforwardly. In this study, two types of neural networks, including Radial Basis and Multilayer Perceptron, were used. Four groups of concrete mix designs also were made with two water to cement ratios (W/C) of 0.35 and 0.4, as well as 10% of cement weight was replaced with silica fume in half of the mixes, and different amounts of superplasticizer were used. With the help of rheology test and compressive strength results at 7 and 14 days as inputs, the neural networks were used to estimate the 28 and 90 days compressive strengths of above-mentioned mixes. It was necessary to add the 14 days compressive strength in the input layer to gain acceptable results for 90 days compressive strength. Then proper neural networks were prepared for each mix, following which four existing networks were combined, and the combinatorial neural network model properly predicted the compressive strength of different mix designs.

• The Korean Journal of Emergency Medical Services
• /
• v.21 no.2
• /
• pp.89-102
• /
• 2017

Purpose: The purpose of the study was to investigate the effects of subtraction meditation on perceived stress, self-efficacy, blood pressure, and pulse rate in paramedic students. Methods: A quasi-experimental study with non-equivalent comparison groups using pre and post-test design was performed. The experimental group consisted of 27 participants who attended the meditation program, and the control group consisted of 26 non-participants of the program. The data were analyzed using SPSS/WIN 24.0. Results: There were a statistically significant differences between the experimental group and the control group in perceived stress(t=2.301, p=.026), systolic pressure(F=18.531, p=.000), diastolic pressure(F=9.745, p=.003), and pulse rate(F=33.869, p=.000) between pretest and posttest results. Conclusion: The subtraction meditation program can help reduce perceived stress, systolic pressure, diastolic pressure, and pulse rate.

• Nuclear Engineering and Technology
• /
• v.53 no.1
• /
• pp.337-343
• /
• 2021

In this work, self-absorption correction factor related to the variation of the composition and the density of soil samples were evaluated using the p-type HPGe detector. The validated MCNP5 simulation model of this detector was used to evaluate its Full Energy Peak Efficiency (FEPE) under the variation of the composition and the density of the analysed samples. The results indicates that FEPE calculation of low gamma ray is affected by the composition and the density of soil samples. The self-absorption correction factors for different gamma-ray energies which was fitted as a function of FEPEs via density and energy and fitting parameters as polynomial function for the logarithm neper of gamma ray energy help to calculate quickly the detection efficiency of detector. Factor Analysis for the influence of the element composition in analysed samples on the FEPE indicates the FEPE distribution changes from non-metal to metal groups when the gamma ray energy increases from 92 keV to 238 keV. At energies above 238 keV, the FEPE primarily depends only on the metal elements and is significantly affected by aluminium and silicon composition in soil samples.

• The Journal of Korean Association of Computer Education
• /
• v.14 no.1
• /
• pp.35-43
• /
• 2011

The purpose of this research is to confirm that how the support type of the assistant teacher changes the students' creativity and self-efficacy in the Robot Education, particularly Robot Edu-Camp. The study objects are 72 elementary students for 8 groups; each group has 9 students, and 4 groups of them have the assistant teachers and others are supported by giving some feedbacks for their questions or some information if they need. The assumption of this study sets up as in the following; there are no differences for the students' creativity and self-efficacy between the supporting of the assistant teachers with making robots and programing together and the giving feedbacks and information if students need. To verify this assumption, we use the nonequivalent control group in the pretest-posttest designs. The result is as in the following. There's no meaningful differences of the students' creativity by the support type of the assistant teachers. But in the self-efficacy, the groups which are giving feedbacks and information if they need have more higher level of achievement than others. The result shows that if the assistant teachers help the students directly, the students' levels of the self-direction, and control are low because they lean on the teachers. This will give you some implications to the follow-up studies about the support type of the assistant teachers in the Robot Education.

• The Journal of the Korea Contents Association
• /
• v.13 no.9
• /
• pp.227-235
• /
• 2013

This study aims to testify the effect of self-esteem improvement program for elementary school children from single-parent families on their self-esteem and depression. Methods: The research design used in this study was a non-equivalent control group pretest-posttest research design. The participants were divided into two groups, an experimental group(n=11) and a control group(n=13). Data were analysed by using Mann-Whinety U test, Wilcoxon Signed Ranks, Cohen's d with SPSS(PASW)18.0 program. Result: Significant differences were found in scores for self-esteem(z=-2.499, p<.012, ES(d)=0.7) and depression(z=-2.145, p<.032, ES(d)=-0.4) in experimental group. Conclusion: The results indicate that the self-esteem improvement program should be used with elementary school children from single-parent families to help them and to improve their psycho-social adaptation.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.22 no.4
• /
• pp.255-262
• /
• 2021

This study examined the effect of rope play through forest experience on children's self-confidence. Empirical analysis through the experimental design was carried out on an experimental group of 15 (seven male and eight female children) and a control group of 15 (nine male and six female children). Analysis of covariance (ANCOVA) for the effect between the experimental and control groups after the experimental treatment showed that the mean of the experimental group was significantly higher than that of the control group (F=357.350, p<.001). Rope play through forest experience has a statistically significant effect on the children's self-confidence. Consequently, rope play through forest experience between peers is a beneficial experience that helps improve children's self-confidence. Furthermore, it is a positive play activity to help them with a passive character boost to their self-confidence through cooperation between peers.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.12
• /
• pp.5759-5765
• /
• 2011

This study was done to compare the educational effects of two nursing students groups, CPR theoretical and practical education versus CPR theoretical education only. It would be used as a basis for more effective CPR training of future nursing students. The subjects in study were 72 nursing students in D college D city, from august 22 to august 24, 2011. The collected data were analyzed with SPSS WIN 18.0 program for the frequency, percentage, $x^2$-test, t-test and paired t-test. On the findings of this study, CPR training improved not only CPR performance but also self-efficacy in the both groups. Especially, the combination with theoretical and practical education was seen as a more effective methods. Therefore, combinational training would be required for more effective CPR training, rather than focusing on training for improving their simple knowledge. Furthermore, it will help nursing students to perform quickly and accurately CPR in unforeseen situations.

• Journal of the Korean Home Economics Association
• /
• v.40 no.3
• /
• pp.155-164
• /
• 2002

This study was conducted to investigate the differences in environmental and psychological factors in children with obesity and to offer useful information for obesity treatment and prevention. 123 children of 5-6th grade in elementary school and their mothers were included in this study and divided into either the obese group and normal group(obese group: 61, normal group: 62) according to the Weight-Length Index(WLI). Results showed that between the two groups there no significant differences in family income, mother's occupation status, educational level, and anthropometric measurement. Nutritional knowledge in the obese group was significantly higher than that of the normal group(p<0.05). The mothers of children with obesity had a higher level of nutritional knowledge than the mothers of normal children(p<0.05). There were no significant differences in food behavior between the obese and normal groups. There were no significant differences in maternal child-rearing practices and in maternal attitude on flood behavior of children. Considering psychological factors ; 72.1% of the children with obesity appraised their body image as obese(p<0.05), and 54.1% of the mothers in obese group perceived their child's body shape as obese(p<0.05). The level of self-esteem were not significantly different when compared between the obese and normal groups. From these results, it was suggested that effective measures for obesity treatment and prevention should include nutritional monitoring, and such efforts need to be maintained in order to help the obese children and their mothers.

• Journal of Korean Academy of Nursing
• /
• v.42 no.2
• /
• pp.269-279
• /
• 2012

Purpose: To develop a expressive writing program for women with breast cancer and to identify its effects on stress physical symptom, cancer symptom, anxiety, depression, and QOL. Methods: A non-equivalent control pre-post design was used. Participants were recruited from self-help groups in six hospitals and were assigned to the experimental group (29) or control group (29). Data were collected before, after, and at four weeks after the intervention program. Changes in the variables were evaluated to test effects of the developed program, using $X^2$-test, Fisher's exact test, repeated measures ANOVA, and paired t-test. Results: The expressive writing program was developed for women with breast cancer based on Pennebaker's expressive writing. Significant differences were found between the two groups for stress related to physical symptoms ($p$<.00) and quality of life ($p$=.024). No significant differences were found in cancer symptoms, anxiety, or depression between the two groups. Conclusion: The results indicate that the expressive writing program designed to express cancer-related deep thoughts and emotions helps in decreasing physical symptoms and improving QOL. Further studies are needed to identify the effect on emotions such as anxiety and depression for women with breast cancer with above average levels of anxiety and depression.

• The Korean Journal of Elementary Counseling
• /
• v.4 no.1
• /
• pp.85-98
• /
• 2005

This study aimed at examining an effect of a group art treatment program on isolated children's self-concept and adaptation to the school life in an elementary school. To achieve this goal, the two hypotheses were made. Hypothesis 1. Children in the experimental group that participated in the group art treatment program will show more improvement in self-concept than those in the control group. Hypothesis 2. Children in the experimental group that participated in the group art treatment program will show more improvement in the ability to adapt themselves to the school life than those in the control group. To test the hypotheses, the socio-emotional isolation test developed by Heo Seung-hi (1993) was carried out with 120 third-graders at K elementary school in Busan; then, 24 isolated children (12 boys and 12 girls) at the upper 25 percent level were randomly sampled and assigned to each of experimental and control groups. The five-stage art treatment program as a reconstruction of the prior study to meet the goal of this study was provided to children in the experimental group at the researcher's classroom after school for 13 sessions, two sessions per week. The self-concept test manufactured by Song In-seop (1996), the school life adaptation test developed by Lee Yeong-seon (1997), and the experimental group's school life drawing (KSD) were used to test an effect of the program. For data analysis, two methods, a quantitative analysis of two tests and a qualitative analysis of KSD, were used. The findings were as follows: After implementing the art treatment program with the experimental group, there was significant improvement in all areas. This study concluded that if a group art treatment program is applied to elementary school practice, it will help isolated children improve their self-concept and ability to adapt themselves to the school life.