• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.19 no.1
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• pp.33-39
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• 2013

Background: The purpose of this study was to find out the effect of trunk stabilization training on the self posture control efficacy, physical self-description and perception stress in high school students. Methods: 92 voluntary students (73 females, 19 males) participated in this study. They received trunk stabilization training for 40 minutes per day and a time per week during 6 weeks period. Trunk stabilization training was an approach of education in proper posture and coordination of movement. In the evaluation, the self posture control efficacy scale (SPCES) was used to measure the posture control efficacy, the physical self-description questionnaire (PSDQ) was used to measure the physical self description and the perception stress scale (PSS) was used to measure the stress. All measurement of each subject were measured before and after stabilization training. Results: The SPCES were significantly different before and after (p<.05). The PSDQ and PSS were no significantly different before and after (p>.05) but the means were increased slightly. Conclusion: Conclusionally these results suggest that the trunk stabilization training increased the self posture control efficacy and would give help to control Students themselves.

• The Korean Journal of Community Living Science
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• v.28 no.2
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• pp.289-300
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• 2017

This study was performed to investigate the effects of academic stress and academic burnout on smartphone addiction in junior high school students. A survey was conducted using a convenient sample drawn from 306 students at six junior high schools in Seoul. Data were analyzed using the SPSS 23.0 program. The results show that 21.6% of students were at risk of smartphone addiction. The high risk of smartphone addiction group used smartphone longer during weekdays and weekends. In addition, the high level of academic stress and academic burnout groups showed higher smartphone addiction scores compared to the lower level of academic stress and academic burnout groups. Smartphone addiction was positively correlated with academic stress and academic burnout. Furthermore, the results show that academic achievement and attending class, academic stress and disengagement, and academic burnout affected smartphone addiction. Therefore, to prevent smartphone addiction in adolescents, academic stress should be reduced in adolescents as well as develop educational programs to help students release or control their academic stress.

• Korean Journal of Applied Biomechanics
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• v.23 no.2
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• pp.117-123
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• 2013

The purpose of this study was to provide data to increase the success rate of penalty kicks through quantifying the shape of skilled kicks by performing a kinematic analysis on the change of movement during the kicking phase which the goalkeeper uses as a vital clue. Three high definition video cameras(GR-HD1KR, JVC, Japan) were used for the study and 18 reflective markers were attached to the body joints. Corners of the goal, difficult for goalkeepers to block, were set as aims and 1 m by 1.2 m targets were installed. Each subject had five sets of kicks at random, and the analysis was done on the movements that hit the target. Time, speed of the right lower limb's center of mass, joint angle, and angular velocity were chosen as factors and the results of the analysis showed statistical significance. The player taking a penalty kick should train to avoid leaning one's body towards the kicking direction and change the angle of the right foot right before the impact to decide the direction of the ball. The goalkeeper can increase the save success rate by studying the angle of the kicker's body and the right foot as well as the timing of the kick.

• Advances in nano research
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• v.14 no.6
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• pp.541-555
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• 2023

The extensive use of polymeric matrix composites in the athletic sector may be attributed to its high strength-to-weight ratio, production economy, and a longer lifespan than conventional materials. This study explored the impact of carbon nanotubes on the properties of different composite field sports equipment components. The test specimens were fabricated using the compression molding technique. The insertion of carbon nanotubes increases mechanical properties related to the process parameters to account for an improvement in the stick sections' overall performance. The dynamic response of functionally graded reinforced nanocomposite wire structure is examined in this paper on the bases of high-order hyperbolic beam theory lined to the size-dependent nonclassical nonlocal theory under the external mechanical load due to the physical activities. Finally, the impact of different parameters on the stability of nanocomposite structures is discussed in detail.

• 대한공업교육학회지
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• v.41 no.2
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• pp.89-118
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• 2016

In this study, the model of Turtle Ship, which is evaluated as one of the world's first ironclad ship in battle as well as the traditional scientific and technological heritage in Korea, was combined with the Physical Computing Platform(Arduino and App Inventor) that enables students to learn the basic concepts of IT in an easy and fun way. Thus, this study contrived the Physical Computing Platform-based Turtle Ship model which will make the students of Industrial Specialized High School develop the technological literacy and humanities-based knowledge through flexible education out of stereotype and single subject as well as enhance the potential of creative convergence education. The following is a summary of the main results obtained through this study: First, Arduino-based Main-controller design and making is helpful to learn of the hardware and software knowledge about EEC(Electron Electronics Control) and to confirm the basic characteristics and performance of interaction of Arduino and actuators. Second, The fundamental Instructional environments of abilities such as implementing EEC systems, thinking logically, and problem-solving skills were provided by designing of pattern diagram, designing an actuator circuit and making, the creation of sketches as technical programming and developing of mobile app. Thirdly, This is physical computing platform based Turtle ship model that will enable students to bring up their technological literacy and interest in the cultural heritage.

• Physical Therapy Korea
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• v.17 no.4
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• pp.69-76
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• 2010

The purposes of this study were to examine the reliability and validity of Korean translation of Pediatric Evaluation of Disability Inventory (PEDI-K) in school-aged children with cerebral palsy (CP). The PEDI-K, Functional Independence Measure for Children (WeeFIM) and Gross Motor Function Classification System (GMIFCS) were completed in 104 school-aged children with CP by therapists. The internal consistency of the PEDI-K was calculated by Cronbach's alpha (${\alpha}$) for assessing reliability. Concurrent validity was evaluated by correlation with the subsets of WeeFIM. Discriminant validity was assessed by comparing GMFCS levels with tests of the PEDI-K. The results showed that internal consistency was good (Cronbach's ${\alpha}$ ranged from .97~.98). Concurrent validity was demonstrated. The correlation with WeeFIM was high in the Functional Skills (self-care, r=.74~.94; mobility, r=.59~.91; social function, r=.65~.93) and in the Caregiver Assistance (self-care, r=.75~.94; mobility, r=.63~.90; social function, r=.78~.96). Discriminant validity was demonstrated on significant decreases in domain scores with increasing GMFCS levels. Reliability and validity have been demonstrated on the PEDI-K. This study extends usage of PEDI-K in clinical activities and research.

• Journal of the Korean Society of School Health
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• v.30 no.3
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• pp.325-335
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• 2017

Purpose: The purpose of this study was to investigate the effect of physical activity on suicidal ideation according to gender in South Korean adolescents. Methods: This study is designed as a cross-sectional study. Using the statistics from the 12th (2016) Korea Youth Risk Behavior Web-based Survey, hierarchical logistic regression analysis was conducted. The study sample comprised 62,558 middle and high school students aged primarily 12 to 17. Results: The rate of engaging in physical activity more than three times a week was 39.6% for boys and 28.8% for girls and the rate of suicide ideation was 9.35% for boys and 14.9% for girls. Male students were 1.42 times more likely to commit suicide when they did not engage in physical activity than when they do more than three times a week but it was found to have no significant effect on female students. Conclusion: Physical activity should be encouraged in the physical education curriculum and the school health area to reduce suicidal ideation in adolescents. Differentiated interventions are required according to gender. It is suggested that intervention programs involving physical activity be implemented more actively for male students and intervention programs centering on obesity and smoking prevention be implemented for female students.

• Journal of Life Science
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• v.18 no.8
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• pp.1072-1082
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• 2008

The purpose of this study was to report the difference of nutritional factors for high school female tennis players pre and during the competition. A total of 7 tennis players (4 elite and 3 non-elite) participated in this study. All participants reported the total food lists and amounts of ingestion prior to 3 days and during 3 days the competition. The total calorie of prior to the competition for elite group (2869.7${\pm}$426.6 kcal) was significantly higher than non-elite group (1743.4${\pm}$220.8 kcal). The amount of carbohydrate for elite group (pre: 242.2${\pm}$188.4 g, during: 241.6${\pm}$ 201.4 g) was statistically higher than non-elite group (pre: 173.9${\pm}$127.1 g, during: 206.8${\pm}$123.7 g) pre and during the competition. There were no different amount of protein and fat between two group before and during the competition. The amount of calcium and phosphorus were also no different among the groups The consumption of iron was different prior to the competition (15.95${\pm}$3.09 vs. 10.36${\pm}$2.40 mg). The elite group (1.76${\pm}$0.30 mg) consumed vitamin B1 more than non-elite group (1.21${\pm}$0.23 mg) during the competition. No different other vitamines between two groups pre and during the competition.

• Korean Journal of Health Education and Promotion
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• v.23 no.3
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• pp.37-51
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• 2006

Objectives: The objective of this study is to investigate the relation between the obesity prevalence of elementary school students and some factors such as socio-demographic factors, parent's obesity, diet habit and physical activity. Methods: The students of the fourth(443), fifth(405) and sixth grade(417) at six elementary schools in the school district of Daejeon metropolitan city were sample-surveyed and classified into a normal group, a non-intensive obesity group, and a highly intensive obesity group. Results: 1. The obesity rate of the elementary school students in the school district of Daejeon metropolitan city was total 14.2%. 2. The obesity rate of students with parents who had high BMI was notably higher than the other groups. 3. Diet factors such as eating fast, always eating one more, liking fatty food and the frequency of snacks were more critical than physical activity factors in relation to school children's obesity. Conclusions: From the above evidences, it is apparent that the obesity of elementary school students have strong relations with eating habits. It is needed that obesity prevention program such as effective meal guidance in addition to intense physical activities is included in the curriculums of health education for elementary school students.

• The Journal of Korean Society for School & Community Health Education
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• v.12 no.1
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• pp.1-20
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• 2011

Purpose: The purpose of this study is to analyze factors affecting suicidal ideation of athletes in middle and high school. Methods: The data in this study came from the survey which conducted to 500 students of physical education high school athletes and elite athletes in general school from the beginning of December 2009 to the end of January 2010 in Seoul and Kyunggi. Finally 436 cases was used. The dependant variable is suicidal ideation in this study. And the independent variables are socio-demographic factors, exercise-related factors, school and family environments, stress and depression factor. The analysis method is logistic regression analysis. Finally 436 cases was used. Results: First, the rate of suicidal ideation of athletes in middle and high school was 28.9%. Second, there were significant differences between stress and sex, grades, athletic career, kind of sport, sport skill level, the average exercise time per day, family circumstances, life satisfaction, future expectations. Third, there were significant differences between depression and sex, academic achievements, the average exercise time per day, family circumstances, life satisfaction, future expectations. Fourth, there were significant differences between suicidal ideation and sport skill level, academic achievements, the average exercise time per day, family circumstances, life satisfaction, future expectations. Fifth, the higher level of stress and degree of depression, the more increased the risk of suicidal ideation. Conclusions: Considering the close relationship between suicidal ideation and suicidal attempt, to reduce the suicidal ideation of athletes in middle and high school it is necessary to adjust exercising time properly and to promote life satisfaction. Also to overcome depression and stress support system should be established and to promote self-efficacy cognition strength program should be introduced in the school. So athletes in middle and high school should have confidence and self-confidence on the future.