• Journal of the Korean Society of Food Science and Nutrition
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• v.46 no.11
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• pp.1397-1407
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• 2017

The aim of a school attendance policy (SAP) is to ensure breakfast time for school-aged adolescents. Therefore, this study investigated the effects of SAP on dietary behavior, particularly breakfast consumption, among adolescent middle school students (n=426) in the Ansan area of Gyeonggi-do. After implementation of the SAP, the response rates for eating breakfast every-day among boys (P>0.05) and girls (P<0.05) slightly increased by 44.6% and 35.8%, respectively, compared to before the SAP. Further, the degree of satisfaction with breakfast increased among both boys ('satisfied' and 'strongly satisfied'; 32.4% and 21.6%, respectively) (P<0.01) and girls ('satisfied' and 'strongly satisfied'; 32.8% and 14.2%, respectively) (P<0.001) compared to before the SAP. Moreover, boys (56.8%) and girls (53.9%) were aware that the SAP increased breakfast-eating frequency. Increases in deep sleep as a result of the SAP were high in both boys (39.2%) and girls (47.1%), and sleeping hours among boys (P<0.05) and girls (P<0.01) increased compared to before the SAP. The respondents were aware of the positive effects on physical function such as reduction of physical fatigue (boys 40.1%, girls 38.2%) and improvement of physical health (boys 36.5%, girls 32.8%). Thus, systematic and sustained political support at the national level is required to encourage healthy breakfast eating and physical activity in middle school students.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.12 no.1
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• pp.25-50
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• 2001

Using Fourier transformation and wavelet analysis, we compared the auditory event-related potentials of the patients with attention deficit-hyperactivity disorders(abbr. ADHD, 13 boys) and normal control children(8 boys). Amplitudes of the event-related potentials which were calculated via Fourier transformation were compared between the groups and between conditions(non-target versus target) in each group. To the non-target stimuli, the patients with ADHD showed significantly greater amplitudes across almost all of the electrode sites and frequencies. To the target stimuli, the incidents which ADHD patients showed much higher amplitudes than normal controls significantly decreased, while those of the reverse results increased significantly. These results were consistent with the comparison results about negative difference wave(abbr. Nd wave) using Fourier transformation. In summary, it was proved that non-target stimulus which should be ignored elicited more robust electrical response from the patients with ADHD than normal children, but the target stimulus which reguired active processing did much less electrical activity in the patients. For the patients, they showed much inhibited electrical response to the target stimuli in some electrodes and frequency ranges. Normal children were more strongly stimulated by the target stimuli in almost all electrodes and frequency ranges than the patients, but less in prefrontal leads and frontal leads. Wavelet analysis results proved that early responses(0-300msec) to the nontarget stimuli of the patients were significantly greater than the normal controls in prefrontal, anterior frontal, some parts of temporal, and occipital lobes and that late response(300-370msec) were significantly lesser than normal children in parietal and central electrodes. Target stimuli elicited significantly higher electrical activity in both group than non-target stimuli did. Prefrontal and frontal lobes showed stronger responses in the patients than normal children irrespective of stimulus condition, but parietal and temporal lobes did higher activities in normal children than the patients only to the target stimuli. In conclusion, the patients with ADHD showed much greater responses to the stimuli which should be ignored, but failed to activated the necessary processes to the target stimuli. Also, we found that the frequency-dimension analysis and wavelet analysis were useful for the signal processing such as event related potentials.

• Journal of the Korean Data and Information Science Society
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• v.27 no.4
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• pp.1013-1025
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• 2016

The purpose of this study was to analyze longitudinal effect of physical education activity (PEA) score on self-rated health evaluation change (SHEC). This study used hierarchical linear and nonlinear models to investigate of the SHEC during the transition into adolescence (from middle school 1st to high school 2nd grade). Using the Korea children and youth panel survey (KCYPA), data were collected over the course of five years (from 2010 and 2014). HLM 6.8 computer program was used to analyze the data. The result were as follows. First, boys' SHEC increased across the five years, and girls' SHEC decreased across the five years. Second, boys' the self-rated health was increased across the three years and decreased across the two years. Third, girls' the self-rated health was increased across the two years and decreased across the three years. Fourth, the PEA score of 1st grade of high school showed a significant positive association with the boys' SHEC. Fifth, the PEA score of 1st grade of middle school showed a significant negative association with the girls' SHEC.

• Journal of the korean academy of Pediatric Dentistry
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• v.25 no.1
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• pp.225-233
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• 1998

The purpose of this study was to determine the thickness of the cortical bone at the mandibular angle in children and adolescents. The subjects were composed of 153 subjects who were 3 to 17 years of age that had not been history of bone disease or metabolic disease and no dental caries or tooth loss on mandibular molars. The subjects were divided into three age groups, group I (preschool children) was 3 to 5 years of age and grouop II (school children) was 6 to 11 years of age and group III (adolescence) was 12 to 17 years of age. Panoramic radiographs of these patients were collected and measurements of the thickness of the cortical bone were obtained at the mandibular angle. The average thickness of the cortical bone in the group I was 1.01$\pm$0.18 mm in boys and 1.07$\pm$0.22 mm in girls. In the group II was 1.23$\pm$0.18 mm in boys and 1.32$\pm$0.18 mm in girls. In the group III was 1.60$\pm$0.23 mm in boys and 1.58$\pm$0.20 mm in girls. Statistical analyses did not reveal any significant difference between the right or left side of the mandible but difference was exist between the same age groups by sex, especially in group II (p<0.01), except in group III. The greater thickness of cortical bone in the older age group was shown to be statistically significant. The correlation coefficient between age and the thickness of the cortical bone at the mandibular angle showed a high value of r=0.76.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.2 no.1
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• pp.87-96
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• 1991

A double bhad, placebo controlled study was performed to evaluate the therapeutic effects of Carbamazepine in autistic children, 23 boys with the diagnosis of Pervasive Developmental Disorders according to the DSM-IIIR were selected for study subjects, from Child and Adolescent Psychiatric Outpatient Department of Seoul National University Children Hospital during Oct. $1989{\sim}Nov.$ 1991. Subjects with histories of medical disease or psychiatric diseases were excluded and all study subjects had drug free periods more than 2 Months. Study subjects were randomly assigned to Cabamazepine treatment group(N=12) and placebo group(N=11). After the baseline observation periods, the double blind drug treatment and observation were performed for 12 weeks. Several scales (Ritvo-Freedman Real Life atring Scale. Behavior Checklist) were employed to evaluate the effects of drug treatment during baseline observation periods and the drug treatment periods by two raters blind to the study. Interrater reliability of each scales were .4875~.6613, the socrodemographic variables and the rating scores during baseline observation periods were not significantly different between two groups. Reduction of total scores in Autsm Behavior Checklist scale, i.e.. improvement of global autistic symptoms were noted significantly in Carbamazepine treatment group. Improvement in significant social maturations according to Vineland Social Mataration scale were observed in both patient groups after drug treetment periods.

• Human Ecology Research
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• v.52 no.4
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• pp.395-403
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• 2014

The purpose of this study was to analyze the effects of children's self-esteem on their school adjustment, focusing on the mediation of peer attachment. A total of 2,200 3rd grade children from the third Korea Child-Adolescent Panel Survey participated in this study. The instruments used in this study were the Self-esteem Scale, Peer Attachment Scale, and School Adjustment Scale. The collected data were analyzed by using a Student's t -test, Pearson's partial correlation, simple regression, and hierarchical multiple regression with SPSS ver. 16.0 software. The main results of this study are as follows: first, the boys had higher self-esteem, peer attachment, and school adjustment scores than the girls. Second, there was a significant positive correlation between children's self-esteem and peer attachment as well as a significant positive correlation between children's self-esteem and school adjustment. Further, there was a significant positive correlation between children's peer attachment and school adjustment. Finally, children's self-esteem exerted positive effects on their peer attachment, and children's peer attachment had a positive influence on their school adjustment. The effect of children's self-esteem on their school adjustment was partially mediated by their peer attachment. These findings provide preliminary evidence that the relationships between children's self-esteem and school adjustment may be mediated by their peer attachment.

• The Korean Journal of Community Living Science
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• v.16 no.3
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• pp.65-73
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• 2005

The purpose of the research was to investigate the characteristics and related factors of cyber dating violence. The subjects were 548 adolescents in high schools. The gathered information was analyzed by frequency, percent, 1-test, ANOVA, and Correlation by using SPSS 10.0 program. The results were as follows: (1) $65.3{\%}$ of the answerers experienced cyber dating, and $44.5{\%}$ of the students have experienced cyber dating violence. (2) $40.3{\%}$ of the students were damaged by psychological violence, and $21.1{\%}$ of the students have caused psychological violence. (3) $41.9{\%}$ of the damaged students and $18{\%}$ of the perpetrating students were included in the total answerers, but among 244 experienced students, $94.3{\%}$ were damaged students and $40.6{\%}$ perpetrated sexual violence, so it is concluded that experienced students experience sexual violence. (4) Looking over the social demography factors and cyber dating violence, boys rather than girls, and vocational school students rather than academic school students have more cyber violence experiences. (5) The relationship between psychological and sexual violence has a significant relationship with all cyber violence experiences.

• Journal of Microbiology and Biotechnology
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• v.25 no.12
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• pp.2169-2172
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• 2015

This study investigated the cross-sectional and longitudinal association between adenovirus 36 (Ad36) and obesity in 79 Korean adolescent boys over 1 year. We analyzed the changes in body composition and metabolic risk factors according to the presence of Ad36 antibodies. Ad36 antibodies in serum were detected using the constant virus-decreasing serum method. We found that the fat percentage and fasting insulin in the Ad36-seropositive group were greater than the Ad36-seronegative group. These results suggest that Ad36 infection is associated with an increase of adiposity, and the experience of Ad36 infection may affect the future fat gain of adolescents.

• Korean Journal of Childcare and Education
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• v.14 no.3
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• pp.77-95
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• 2018

Objective: The purpose of this study was to examine the mediating role of school adjustment in the relationship between adolescents' mastery goal orientation and life satisfaction, and the differences according to gender in the relationship. Methods: The participants were 1,947 students from the 3rd, 4th, and 5th waves of the Korean Child Youth Panel Study(KCYPS). The data were analyzed with structural equation modeling(SEM) and multiple group analysis. Results: First, school adjustment of 1st graders in middle school mediated the relation between mastery goal orientation of 6th graders in elementary school and life satisfaction of 2nd graders in middle school. Second, the differences in gender were confirmed. The effect of mastery goal orientation of 6th graders in elementary school on school adjustment of 1st graders in middle school is higher for boys. In contrast, the effect of school adjustment of 1st graders in middle school on life satisfaction of 2nd graders in middle school is higher for girls. Conclusion/Implications: The results of this study suggested that mastery goal orientation before entering middle school and school adjustment after entering middle school could be important variables to increase adolescents' life satisfaction. Also, it is necessary to consider gender difference for long-term intervention for improving adolescent life satisfaction.

• Korean Journal of Health Education and Promotion
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• v.28 no.1
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• pp.93-101
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• 2011

Objectives: The aim of this study was to investigate the prevalence of metabolically obese, normal-weight (MONW) phenotype and the association between lifestyle factors and the risk of MONW in Korean adolescents. Methods: Normal-weight (BMI, 5th to 85th percentile) subjects with ${\geq}1$ metabolic abnormalities were categorized as MONW phenotype. Data from adolescents aged 12 to 18 years who have participated in the Korean National Health and Nutrition Examination Survey in 1998 (n=751) and 2008 (n=455) were analyzed. Physical activity and dietary intakes were assessed. Results: The prevalence of hypertension and hyperglycemia in 2008 decreased compared with that in 1998 (P<0.001) but the prevalence of abdominal obesity, hypertriglyceridemia and low HDL did not changed. The overall prevalence of MONW in Korean adolescents declined over 10 years (P<0.001). Adolescent boys and girls engaging regular exercise significantly increased over 10 years (P<0.01). Physically active adolescents had a lower risk of being MONW in 1998. Dietary intake patterns were not associated with a risk of MONW. Conclusions: The prevalence of MONW among Korean adolescents declined over 10 years which may be due to the decreased prevalence of hypertension and hyperglycemia. The risk of MONW would be lower in individuals who are physically active.