• 아동학회지
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• 제33권2호
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• pp.111-127
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• 2012

This study compared a number of related variables according to children's stress types using the data mining method. The sample population was taken from the Korean Youth Panel Survey (KYPS) data (2688, sixth-grade elementary students). The results of the decision tree model revealed that : (1) Parental expectations in terms of study, life satisfaction, self-esteem, parental attachment, aggression, the spousal relationship, other cognition (one's own misdeeds), and study related worries were all related to parent stress. (2) Life satisfaction, study related worries, admitting one's own misdeeds, gender, other cognition (one's own misdeeds), aggression, the spousal relationship, and a sense of alienation in the school were all related to appearance stress. (3) Study related worries, parental expectations in terms of study, aggression, life satisfaction, self-esteem, parental attachment, satisfying parental expectations, parental attachment, and teacher attachment were all related to academic stress. (4) A sense of alienation in the school, mixing with peers in the school, aggression, self-esteem, other cognition (one's own misdeeds), study related worries, parental abuse, and life satisfaction were all significantly related to friend stress. These results suggested that children's diverse conditions should be considered according to the stress types if we are to understand and cope with these stress types more efficiently.

• International Journal of Reliability and Applications
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• 제15권2호
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• pp.85-98
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• 2014

Accelerated life testing (ALT) is a well famous technique in life testing and reliability studies, this is particularly used to induce so high stress leading to failure of the highly reliable units quickly under stipulated duration of time. The step-stress ALT is one of the systematic experimental strategy of ALT applied to fail the units in steps. In this article we focus on two important issues (i) necessity of life tests at higher steps with relevant causes (ii) to develop a new optimum test plan for 3-step SSALT under the modified cumulative exposure model proposed by Khamis and Higgins (1998). It is assumed that the lifetime of test units follows Rayleigh distribution and its scale parameter at constant stress level is assumed to be a log-linear function of the stress. The maximum likelihood estimates of the parameters involved in the step-stress ALT model are obtained. A simulation study is performed for numerical investigation of the proposed new optimum plan 3-step, step-stress ALT. The necessity of the life test units at 3-step step-stress is also numerically examined in comparison to simple step-stress setup.

• 한국가정과교육학회지
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• 제8권1호
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• pp.59-78
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• 1996

The purpose of this study were to investigate adolescents’level of stress, and coping behavior of stress as related to socio-demographic variables. The subjects were 270 first-grade middle school students and 258 first-grade high school students in Ansan. The data were analyzed by S.A.S. Program Package, the statistical methods of Frequency, Percentage, Mean, Standard deviation, T-test, One-way Anova, DMR(Duncan’s Multiple Range Test) The results of this study were as followed：1) The general tendency of adolescents’level of stress, and coping behavior of stress were that high school students experienced more stress than middle school students and both experienced more stress in school life than in family life. 2) According to personal variable, there were differences in the grade and scholarly attainment in the low-level stress group. According to parents variables, the level of stress differed significantly according to mother’s school career and father’s occupation in the low-level-stress group. There was significant difference in accordance with mother’s occupation in the high-level-stress group. 3) The coping behavior of stress according to adolescent variables differed significantly according to grades, the monthly income of the household, mother’s level of education and the father’s occupation.

• 보건교육건강증진학회지
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• 제30권5호
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• pp.153-162
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• 2013

Objectives: The purpose of this study was to examine the effect of the horticultural activity program on high school students' stress, self-esteem and quality of life. Methods: Research method used in this was nonequivalent control group pre-test and post-test design. The number of students in experimental and control group were 25 students; The horticultural activities were conducted 15 times twice a week from May $30^{th}$ 2012 to July $18^{th}$ 2012. Results: There were statistically significant differences of stress scores(F=12.678, p=.001) self-esteem scores(t=-2.836, p=.009), quality of life scores (t=-2.958, p=.007) between the experimental and control group. Conclusions: Based on the results, horticultural activity program for high school students was effective in decreasing stress, increasing self-esteem and quality of life. Therefore the horticultural activity program can be adopted as a effective intervention for high school students.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2004년도 학술대회지
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• pp.339-349
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• 2004

The method for fatigue life prediction of ball bearing is proposed applying the algorithm of contact fatigue prediction based on stress analysis. In order to do this, a series of simulation such as initial surface stress analysis, EHL analysis, subsurface stress analysis and fatigue analysis are conducted from the loading at each ball location calculated for a bearing subjected to external bearing load and contact shape function. And uniaxial fatigue tests are performed to obtain fatigue parameter of AISI 52100 steel. It was found that since stress is usually higher at the inner raceway contact than at the outer raceway contact, fatigue failure occurs on the inner raceway first. When the fatigue life calculated in the stress-based method are compared with $L_{50}$ life of L-P model, Crossland criterion for the radial load increment is similar to $L_{50}$ life and Dang Van criterion for the axial load increment is similar. In the case of EHL contact. there is no difference of fatigue life between dry contact and EHL contact, when maximum Hertz pressure exceeds 2.5GPa.

• 한국응급구조학회지
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• 제23권3호
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• pp.83-96
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• 2019

Purpose: This study was conducted to provide fundamental resource in improving the quality of life and stress by understanding the influence of egoresilience and social support by paramedic students during field practice. Methods: The measurement instrument consisted of 100 questions on the general characteristics, egoresilience, social support, stress, and quality of life of the participants. Frequency and descriptive analysis, t-test, ANOVA, correlation analysis, and multiple regression analysis were performed. Results: The average scores for egoresilience, social support, and stress were 3.00, 3.14, and 1.68 out of 4.00, respectively. The degree of stress was high enough to be statistically significant in the case of women compared to men, and if unsatisfied with one's major. The average quality of life score was 4.50. The degree of quality of life was high enough to be statistically significant in the case of men compared to women, smokers, drinkers, and if content with one's major. Conclusion: It is suggested that colleges develop programs to increase the satisfaction rate of the students and improve their egoresilience and social support. Such programs would improve the quality of life and address the stress experienced by emergency medical technology students.

• 한국해양공학회지
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• 제25권5호
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• pp.47-51
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• 2011

This paper analyzes the fatigue-life of welded joints using the notch stress approach. In the notch stress approach, the notch effects are usually approximated by introducing weld-bead parameters for the local detailed weld joints. The actual bead shape is complex and 3-dimensional. It may also greatly influence the fatigue strength. In this study, the welded shape was modeled using a 3D-scanner. The critical distance method was adopted in the evaluation of the fatigue effective notch stress for the weldments. Fatigue life tests were performed to verify the present method of fatigue life estimation for two types of welded plates with longitudinal attachments. The estimated results of the present methods were applied to the results of the experiment. The results of the analysis showed that the scatter of fatigue-life for the experimental data expressed in the nominal stress was significantly reduced by applying the effective fatigue stress of the present study.

• 한국융합학회논문지
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• 제11권6호
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• pp.297-310
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• 2020

본 연구는 다문화가정 청소년의 문화적응 스트레스가 학교생활적응에 미치는 영향에서 우울이 매개효과를 갖는지 분석하였다. 이를 위해 한국아동·청소년정책연구원(National Youth Policy Institute: NYPI)의 다문화청소년패널 데이터 6차년도(2016) 중 총 1,329명을 대상으로 회귀분석을 실시하였다. 연구의 주요결과는 다음과 같다. 첫째, 다문화가정 청소년의 문화적응 스트레스는 학교생활적응에 있어 직접적인 영향을 미치는 것으로 나타났다. 둘째, 문화적응 스트레스가 학교생활적응에 영향을 미치는 경로에서 우울이 두 변수간 부분매개역할을 하고 있는 것으로 나타났다. 이러한 결과를 토대로 다문화가정 청소년의 문화적응 스트레스를 감소시키고 학교생활적응 정도를 향상시키기 위한 응집력강화프로그램 등 소수문화를 수용하는 태도의 중요성을 강조하는 실천적 방안에 대해 논의하였다. 향후 연구에서는 비 다문화가정 청소년과 비교하여 어느 시기에 가장 많은 심리·정서적 불안감에 놓여있고, 학교생활적응 정도에 변화가 있는지 추가적인 연구를 진행이 필요할 것이다.

• 대한지역사회영양학회지
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• 제7권5호
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• pp.705-714
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• 2002

The purpose of this study was to examine the relative importance of everyday life stress, obesity stress, and social support on the BMIs of junior. high school students. Subjects in this study consisted of 229 adolescents from two junior high schools in Iksan-city and Hamyul-eup. For data analyses, the frequencies, percentages, means, 1-tests, Chi-squares, one-way ANOVAS, Pearson's correlation coefficients and regressions were conducted using SPSS WIN program. The mean BMI of the subjects was 20.18, and the ratio of students'BMIs less than 20 was 56.8%, that of students'BMIs greater than or equal to 25 was 8.3%. There were no statistical differences in BMIs by grade and sex. Statistically significant differences in the obesity of the junior high school students were detected according to demographic characteristics such as economic levels, areas of residence, TV watching time, and fathers'physiques. There were significant differences in everyday life stresses, obesity stresses, and social support by sex, but not by grade. Girls showed higher stress levels than boys, specially in family-related life stresses, social relationships, and self-related stresses. Also girls showed higher stress level related to obesity than boys. Girls got more support from their mothers, siblings and friends than boys. With respect to the type of social support, girls perceived more financial, informational, emotional, and judgemental support than boys. These results suggest that girls became more stressed, although on the other hand, they received more social support than boys. The higher the economic level, the longer the TV watching time, and the higher the stresses from everyday life and obesity, the higher the BHIs of the junior high school students were. In conclusion, everyday life stress and obesity stress were the important factors in relation to the junior high school students'obesity.

• 한국콘텐츠학회논문지
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• 제14권11호
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• pp.820-828
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• 2014

본 연구는 중학생의 자살생각에 미치는 영향요인을 파악하기 위하여 시도되었다. 자료는 D광역시의 중학생 673명을 대상으로 설문조사하여 수집하였다. 연구도구는 일상생활 스트레스, 삶의 문제, 사회적지지, 우울 및 자살생각 척도를 이용하였다. 자료분석은 SPSS/WIN 19.0 프로그램을 이용하여 빈도분석, 평균과 표준편차, t-test, One-way ANOVA, Pearson's correlation coefficients, multiple regression analysis로 하였다. 대상자의 자살생각은 5점 만점에 1.22점으로 나타났다. 대상자의 종교, 학업성적, 가족형태, 학교폭력 경험 유무, 경제상태에서 유의한 자살생각 차이가 있었다. 대상자의 자살생각은 일상생활 스트레스, 삶의 문제 및 우울과 정적, 사회적지지와는 부적 상관관계가 있었다. 중학생의 자살생각에 영향을 미치는 요인은 삶의 문제, 우울, 사회적지지, 일상생활 스트레스, 학교폭력 경험으로 나타났다. 본 연구의 이러한 결과에 기초하여 중학생의 자살생각을 예방하기 위해 삶의 문제, 우울, 일상생활 스트레스 및 학교폭력을 감소시키고 사회적지지를 증진하는 중재 프로그램을 고안할 필요가 있다고 본다.