• Journal of the Korea Society for Simulation
• /
• v.28 no.1
• /
• pp.11-21
• /
• 2019

Modeling and simulation(M&S) method are used to quantify the weapon effectiveness. The weapon effectiveness of artillery shells was also partially studied, but there was a lack of research on the effects of the choice of charge. Therefore, this paper presents an artillery shell's EFD(Expected Fractional Damage) calculation model based on the charge and identifies differences in the weapon effectiveness of 3D building targets according to the selection of the charge. First, the input data of the calculation model was collected and a required number of shoots was calculated to achieve the desired effects using the proposed model. Finally, a paired sample t-test was conducted to verify the proposed model.

• Journal of The Korean Association of Information Education
• /
• v.24 no.6
• /
• pp.551-562
• /
• 2020

The purpose of this study is to investigate the effects of Data Science Education classes using PBL-based App Inventor on elementary student Computational Thinking and Creativity. Based on the results of the pre-requisite analysis by Rossett's demand analysis model, PBL-based Data Science Education class was designed according to the procedure of ADDIE model which is 42 hours of classroom instruction for elementary student. As a result of the Paired t-test, it was proved that the Computational Thinking was statistically significantly improved in the post-test. In addition, as a result of the Paired t-test and Wilcoxon's signed rank test, it was found that the sub-factors of Creativity were 'Originality', 'Fluency', 'Closure', 'Average', and 'Index'. Therefore, it was confirmed that the PBL-based Data Science Education class using App Inventor is effective in improving Computational Thinking and Creativity of elementary student.

• Journal of the Korean Data and Information Science Society
• /
• v.23 no.4
• /
• pp.787-796
• /
• 2012

The aim of this study is to closely examine the changes in their metabolic syndrome index and autonomic nerve systems after the 16-weeks's combined exercise program is carried out on low-level physical strength group (PAPS 4-5 level students). They were divided into two groups; exercise training group (15) and control group (15). This program consisted of five-times-a-week's warm-ups, main activities and warm-downs and it takes 50 minutes per trial. Through SPSS 19.0, all averages and standard deviations of dependent variables were calculated. We first performed Shapiro-Wilk's normality test of the variables. Before verifying the effect of combined exercise program, we tested the equality of means of the variables between combined-exercise-programmed-group and control group through a two-sample t-test and carried out a paired t-test to check if the changes in the variables of two groups before and after 16 weeks are statistically significant. Every statistical test is performed at a significance level of ${\alpha}$=.05. The results are as follows. When it came to metabolic syndrome index, there were statistically meaningful changes in waist measurement, triglyceride, glucose with empty stomach and HDL-C. Also, when it came to autonomic nerve system, there were meaningful changes in all variables. Consequently, it seems that the 16-weeks combined exercise program has positive effects on low level physical strength students.

• Journal of Industrial Convergence
• /
• v.19 no.1
• /
• pp.43-51
• /
• 2021

This study aims to implement analyses of types of conflict perceived by teachers and coping methods. Researchers analyzed 561 survey responses of elementary and secondary teachers using independent t-test and ANOVA. Results are as follows. First, regarding perception of teacher conflict, there were statistically significant mean differences by teacher role, status, and location for conflict toward colleague, parents, and policy, by teacher role and status for conflict toward students, by location for conflict toward administrators, and by teacher role and location for conflict toward staff. Second, in regard to coping methods, gender and teacher status in coping methods for students and gender and teacher role in coping methods for policy showed different aspects in the number of responses. Researchers suggested principals' understanding organizational conflict and enhancing conflict management skills and teachers' discussing strategies for conflict resolution.

• Journal of the Korean Data and Information Science Society
• /
• v.23 no.5
• /
• pp.895-904
• /
• 2012

This study aims to examine the effects of a 12-week compound exercise program (aerobic exercise+weight training) on obese middle school girls' leptin and insulin before and after the exercise. This is achieved by dividing obese middle school girls whose body fat percentage is over 30% into a compound exercise group (n=20) and a control group (n=20) and conducting comparative analysis on them.After the Shapiro-Wilk normality test of the variables, a two-sample t-test was performed to see if the variables have the same mean between the compound exercise and control groups. A paired t-test was also performed to see if the changes in the variables before and after the compound exercise program were statistically significant. For all the statistical analysis, the significance level was set at ${\alpha}=0.05$. The results of this study showed the leptin and insulin levels in the combined exercise group had been significantly decreased. The regular 12 weeks of combined exercise is considered to have a positive impact on leptin and insulin levels in obese schoolgirls.

• Journal of the Korean Society for Library and Information Science
• /
• v.42 no.3
• /
• pp.81-101
• /
• 2008

The purpose of this study is to develop a course with project-based teaming method for LIS education and to examine the effects of this method on improvement of problem solving and self-directed learning ability of LIS undergraduate students. The research design was one-group pretest-posttest design in quasi-experimental research. The data were collected from 23 LIS undergraduate students and analyzed by paired t-test with SPSS. The result demonstrated that project-based learning method has an significant effect on improvement of problem solving and self-directed learning ability of LIS undergraduate students.

• The Journal of the Korea Contents Association
• /
• v.12 no.3
• /
• pp.222-232
• /
• 2012

This study was conducted to compare the task-oriented exercise and weight-shifting exercise program has effectiveness on the static and dynamic balance in patients with total knee replacement. The participants were allocated randomly into 2 group : task-oriented exercise group(n=12) and weight-shifting exercise group(n=12). To evaluate the effects of exercise, subjects were evaluated by using Gaitveiw System and functional reaching test for static balance and Balance System for dynamic balance test. The data was analyzed using a paired t-test and independent t-test to determine the statistical significance. Static balance test and dynamic balance test in task-oriented exercise had statistical significance than weight-shifting exercise program(p<0.05). So this results were suggested that the task-oriented exercise was effective on static and dynamic balance in patients with total knee replacement.

• The Journal of Korean Association of Computer Education
• /
• v.22 no.1
• /
• pp.79-86
• /
• 2019

This study examines the impact of modular robot programming education on middle school informatics curriculum learning motivation. For this purpose, the experiment was conducted with a experimental group of 25 people and a control group of 25 people, and modular robot programming education and learning motivation test were used as research tools. As a result of processing the results of the learning motivation test paper with the independent sample t-test and the paired t-test, the experimental group had 9.36 points higher learning motivation than the control group and 15.44 points higher than the pre-test. In particular, it significantly affected the improvement of all the sub-components of the learning motivation, and among them, it greatly affected the enhancement of attention, relevance and satisfaction. In conclusion, it can be seen that modular robot programming education has a positive effect on improving students' motivation to learn the informatics curriculum.

• The Journal of the Korea Contents Association
• /
• v.16 no.5
• /
• pp.318-326
• /
• 2016

The purpose of this study was to analyze differences in toddler teachers' perception and application of the contents of the Standard Educare Curriculum. The participants of this study were 205 toddler teachers in charge of two-year-old children at childcare centers in Jollanamdo. For the survey, a questionnaire was prepared for the purposes of this study based on the contents of the $3^{rd}$ Standard Educare Curriculum. Collected data were analyzed using SPSS 18.0 through frequency analysis, descriptive statistics, paired sample t test, independent sample t test, F test, and Duncan's post hoc test. The results are as follows. First, toddler teachers' perception of the contents of the National Standard Educare Curriculum was high, and the level of understanding was higher than when their academic degree was high. Second, toddler teachers' application of the contents of the Standard Educare Curriculum was relatively high. Third, there was a significant difference between toddler teachers' perception of the contents of the Standard Educare Curriculum and their actual application of the contents.

• The Journal of Korean Association of Computer Education
• /
• v.18 no.2
• /
• pp.47-57
• /
• 2015

In this study, the experiment was carried out on an experiment group of 24 and a control group of 25 in order to investigate the effect of flipped learning on the motivation and academic achievement of elementary students. Research tools such as flipped learning program, motivation questionnaire and academic achievement questionnaire were used. Study procedures consisted of pre-test, experimental process, and post-test in order and the data processing was performed by independent sample t-test and paired sample t-test. The results show that flipped learning has a positive effect on learning motivation and academic achievement. For instance, flipped learning influenced on improvement of motivation elements such as attention and confidence. Also flipped learning has a more effect on low-level students than high-level students in academic achievement.