• Journal of Sport and Applied Science
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• v.7 no.4
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• pp.13-18
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• 2023

Purpose: This study aims to determine what changes occur in body composition and performance by subjecting youth soccer players to weight training and combined training, which are known to be effective in improving anaerobic capacity, for 6 weeks. Research design, data, and methodology: This study was conducted on 30 high school soccer players from S City who had no current injuries or medical problems and had been registered as players with the Korea Football Association for more than 3 years. Subjects were divided into a weight training group (WTG, n=15) and a combined training group (CTG, n=15). Training lasted 6 weeks, and measurements were taken before and after training. Mean (M) and standard deviation (SD) were calculated to present the descriptive statistics of all dependent variables. Paired t-tests were used to test for within-group differences. Further, Independent t-tests were employed to test for between-group differences. Results: In terms of body composition, height significantly increased in WTG and CTG, and body fat percentage significantly decreased in CTG. As for performance, WTG's 20m sprint record decreased significantly. Conclusion: As a result, this study confirmed that weight training improved the 20m sprint ability of youth soccer players. Future research could provide more useful information by extending the study period and incorporating the physical characteristics of adolescents.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.2 no.1
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• pp.11-23
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• 1991

The main purpose of this study was to investigated the relationship between test anxiety and academic performance, additionally to examine the sexual and developmental differences in test anxiety. Test anxiety was assessed by the TAI-K(Kim Moonjoo, 1990) and was done to 388 3rd, 4th, 5th, 6th, grades and 104 9th grades. The level of TAI-K scores devided into a threeway split or five-way split. In the case of elementary school, four main cognitive subject-areas makes(the mean sum of semester) were used as academic performance indicator and with secondary school, all twelve subject-areas were included. The data were processed by correlational analysis and one-way ANOVA. The Results of this study are as follws : 1) Test anxiety correlated negatively and significantly with academic performance. While in the case of elementary school, in four cognitive subject-areas(Korean, Mathmatics, Society and Physics), two variables showed negative relationship, it was shown negatively in six subject-areas among twelve by secondary students. 2) In the area of sexual differences in test anxiety, female showed significantly higher level than male in elementary school however, there were no significant differences in secondary school. 3) In the area of developmental differences in test anxiety, in the case of elementary school. there were no significant differences between four grades.

• Korean Journal of Childcare and Education
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• v.11 no.6
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• pp.199-219
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• 2015

The purpose of this study was to identify the relationship among beginning early childhood teachers' role performance and self leadership, and childcare teachers's supports. The subjects in this study were 491 beginning early childhood teachers working in kindergartens and child care centers across the country. Childcare teachers' support questionnaire(Jae-Young Lee, 2012) role performance questionnaire(Bog-Mae Park, 2011), and self-leadership questionnaire(Dong-Hyen Park,2014) were used for this study. For the research analysis, frequency, Cronbach's ${\alpha}$ coefficient, ANOVA test, $Scheff{\acute{e}}$ post-hoc analysis and Pearson's correlation were calculated and regression analysis were conducted. The results are as follows. Firstly, it was revealed that there are statistically meaningful differences in beginning early childhood teachers 'role performance and self leadership, and childcare teachers's support which were related to early childhood teachers' salary, education background, and age. Also, there are statistically meaningful differences in beginning early childhood teachers' role performance and childcare teachers's support, which were related to type of child-care center role performance, but there were no differences in beginning early childhood teachers' self leadership. Secondly, childcare teachers's support have statistically meaningful positive influences on beginning early childhood teachers' role performance through the mediation of self leadership. Through this study, it is possible to provide basic information to seek ways to enhance beginning early childhood teachers' role performance and self leadership under the considerations of their individual background characteristics, and to promote the practical support for the director or colleagues.

• Journal of Biosystems Engineering
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• v.5 no.1
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• pp.58-65
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• 1980

Sinkage differences between the wheels of a transplanter which are caused by the different hard pan of fields and land preparation affect the field performance of a rice transplanter. In this experiment the relationships between the sinkage differences of the wheels of a transplanter and the planting distance, planting angle, planting depth and deviation from a straight transplanting line were investigated. The objective of this experiment was to obtain some basic informations for the effective use of the rice transplanter . The results of this experiment are as follows. 1. Transplanting distance became shorter as the sinkage differences increased. This effect was greater on the side of the transplanter with a shallower sinkage. 2. The depth of transplanting increased as the differences in the depth of sinkage increase for the side with the deeper sinkage. An opposite trend was observed for the side with shallower sinkage. 3. The angle of transplanted seedlings from the vertical portion increased slightly as the sinkage differences increased. The variation in results were greater from the side of the transplanter with deeper sinkage than with shallower sinkage. 5. The best postures of planted seedling were found when the water depth was 3 cm for the side of transplanter with deeper sinkage and 4 cm for the shallower sinkage side. The relationships between the postures of planted seedling and water depth. , or $y=67.62 + 10.69x-1.76x^2$ for the side of transplanter with deeper sinkage and $y=66.64+11.62x-1.50x^2$ for the side with shallower sinkage, were found from this experiment.

• Journal of The Korean Society of Integrative Medicine
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• v.4 no.3
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• pp.109-119
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• 2016

Purpose : The purpose of this research is to find clinical effects of functional resistance training using weighted vest on gross motor and balance abilities of children with dyskinetic cerebral palsy. Methods : This study selects 3 subjects for 8~12 years old who were diagnosed with children with dyskinetic cerebral palsy. The Design is ABA design of single-subject research design. Baseline(A) and TypeII Baseline(A : 12weeks) phases were received with NDT treatment, Intervention(B : 12weeks) phase provided with 40 minute functional resistance training using weighted vest in a session twice a week. In order to analyze the measure results of gross motor function and performance, balance abilities in children dyskinetic cerebral palsy during baseline, intervention and typeII baseline phase. Result : A statistically significant differences in the total GMFM including walking/running/jumping during baseline, intervention, typeII baseline, but no significant differences in the lying/rolling, sitting, crawling/kneeling and standing. A statistically significant differences in the total GMPM including dissociated movement, coordination, weight shift, stability during baseline, intervention, typeII baseline, but no significant differences in the body alignment domains. A statistically significant differences in the length and surface area ellipse of center of pressure during baseline, intervention, typeII baseline. Conclusion : The intervention method to facilitate multi-joint and closed kinematic chain movement equipped weighted vest applied functional resistance training on children with dyskinetic cerebral palsy effectively improve on gross motor function and performance, balance abilities.

• The Journal of Korean Association of Computer Education
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• v.23 no.3
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• pp.59-64
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• 2020

This study conducted a 15-week experiment on 236 students who took a major in engineering to find out the impact of learning through flipped learning on their academic performance. Previous flipped learning studies have largely been tested on learning motivation or learning satisfaction through questionnaires, and few have compared academic performance differences. Therefore, it is necessary to identify the increase and decrease in academic performance in the flipped learning classroom. Studies have shown significant differences that is a big difference between the academic performance of the experimental group appling flipped learning and the control group appling traditional lecture-style classes, and the academic performance of the experimental group was higher than that of the control group. This can be said to have a positive effect on academic performance. Therefore, it is hoped that the flip learning method will be expanded in all curriculums.

• The Journal of the Korea Contents Association
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• v.22 no.1
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• pp.505-515
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• 2022

The purpose of this study is to identify the characteristics and differences in the perception of professionalism of workers in public and private social welfare institutions, and to understand the effect of professionalism perception on job commitment and performance. The main results and implications are as follows. First, there was a statistically significant difference in the perception of professionalism of public and private social workers. Specifically, private 3.26 and public 3.15 were higher in the recognition of professionalism of social workers working in the private sector than in the public sector. Second, both public and private social workers' perception of professionalism had an effect on job commitment and job performance. In other words, the higher the recognition of professionalism, the higher the job commitment and performance of both private and public sector workers. Third, workers in the private sector were higher in both job commitment and job performance than those in public institutions. In short, although professionalism perception affects the job commitment and performance of private and public workers, the job commitment and performance of private social welfare organizations with high professionalism awareness is high.

• Informatization Policy
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• v.30 no.1
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• pp.23-40
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• 2023

Currently, the Ministry of Strategy and Finance operates performance evaluation of the IT projects of the central government. Recently, with the advent of the Digital New Deal and the Digital Platform Government, the budget for IT projects has significantly increased, leading to a higher level of interest in their performance. In this study, performance-related characteristics were selected through previous research, and an empirical analysis was conducted to examine whether there are actual differences in the performance of IT projects given respective characteristics. As a result of the analysis, new projects and others performed by departments or offices had a statistically significant positive effect on each final evaluation score. In contrast, IT support as well as fund-based projects had a statistically significant negative effect on each final evaluation score. This study suggests that when evaluating the performance of IT projects in the future, it is important to consider the unique characteristics of each project, as these may contribute to respective differences in performance.

• ETRI Journal
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• v.28 no.5
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• pp.680-683
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• 2006

One objective in developing the next generation of wireless communication systems is to increase data rates and reliability. A promising way to achieve this is to combine multiple-input and multiple-output signal processing with a space-time coding scheme, which offers higher coding and diversity gains and improves the spectrum efficiency and reliability of a wireless communication system. It is noted, however, that time delay differences and phase differences among different channels increase symbol interference and degrade system performance. In this letter, we investigate phase differences and their effects on multiple-input and multiple-output systems, and propose a compensation algorithm for the Rayleigh fading model to minimize their effects.

• The Journal of Korean Academic Society of Nursing Education
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• v.22 no.3
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• pp.264-273
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• 2016

Purpose: The purpose of this study was to investigate humanistic knowledge, emotional intelligence, and communication skills among nurses and to identify factors influencing the communication skills of nurses in five hospitals. Methods: Data were collected from 248 nurses in hospitals from August 25 to September 9, 2015. Data were analyzed with descriptive statistics, t-test, ANOVA, Pearson's correlations and enter method regression analysis using the SPSS/Win 22.0 program. Results: There were significant differences in humanistic knowledge according to religion, education, work department, number of night duty, pay level satisfaction, job satisfaction, and job performance. There were significant differences in emotional intelligence according to all general characteristics. There were significant differences in communication skills according to education, position, number of night duty, and job performance. Communication skills showed positive correlations with humanistic knowledge and emotional intelligence. Emotional intelligence correlated positively with humanistic knowledge. Emotional intelligence was a significant predictor and accounted for 32% of variance in the communication skills. Conclusion: To strengthen communication skills, programs need to be complemented in order to promote humanistic knowledge and emotional intelligence for nurses.