• 한국식생활문화학회지
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• 제14권5호
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• pp.507-515
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• 1999

A survey was carried out to investigate relation between stress and nutrient intake in adults. There was a positive correlation between stress and food intake in adults statistically. It seems that women was significantly influenced by physical, psychological and nuerosensational stress than men(p<0.05). The average calorie intake of men was 1721.25Kcal(68.85% of RDA), the women was 1568.79kcal(78.44% of RDA). Intake of protein, calcuim, Vit $B_1$, Vit $B_2$, Niacin were quite less than the RDA in men, wherase intake of calcuim, iron, Vit $B_1$ were quite less than the RDA in women. In changes of nutrient intake by stress, men was increased as higher stress amount, but women was decreased as higher stress amount(p<0.05). It was lower level of nutrient intake in the below 60 scores of food attitude group that was needed improve of food intake and counseling of professional nutritionist.

• 정신신체의학
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• 제4권2호
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• pp.182-197
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• 1996

For the purpose of examining the relationship between smoking, perceived stress and vulnerability factors, and furthermore suggesting interventions to reduce excessive smoking and prevent nicotine dependency effectively, the questionnaires of perceived stress(stressful experiences), ways of stress coping(passive and active copings), smoking motives, social influence, age, amounts of smoking, and nicotine dependency were administered to smokers among medical students in Chosun university(n=186). 1) As a result of classifying smokers by the types of smoking, the most was a type of smokers to reduce negative emotions and the next in order were addictive smokers, smoker for stimulation, smoker for pleasure, etc. 2) The effects of motive, age, and active coping style were significant, but the effects of perceived stress, passive coping style, and social influence were not significant in average amount of daily smoking. 3) The effects of motive, social influence, and age were significant, but the effects of perceived stress, passive and active coping styles were not significant in the degree of nicotine dependency. To summarize, it is concluded that there were a lot of people who smoke to solve negative emotions, but the direct effects of perceived stress and passive coping style on both average amounts of daily smoking and the degree of nicotine dependency were not significant. On the other hand, motive, age, active coping style, and social influence were proved to be more important variables than the others in explaining college students' smoking.

• 한국치위생학회지
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• 제12권2호
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• pp.285-292
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• 2012

Objectives : This study examined the stress-coping methods used by Dental Hygiene students according to their degree of self-leadership to provide basic data for students' self-leadership training programs. Methods : Dental Hygiene students in Seoul and Gyeonggi-do were surveyed to measure their self-leadership in six categories-self-expectation, rehearsal, goal-setting, self-compensation, self-criticism, and constructive thinking-sand, in four categories-sproblem-centered coping, social support coping, emotional coping, and wishful thinking coping-son a scale of 1 through 5. Results : The findings of the study were as follows: The overall average score of self-leadership was 3.34 and the scores for each subfactor were 3.82 for self-compensation, 3.57 for self-expectation, 3.44 for rehearsal, 3.42 for goal-setting, 3.30 for self-criticism, and 3.12 for constructive thinking. The overall average score of stress-coping was 3.29 out of 5 and the scores for active coping were 3.14 for problem-centered coping and 3.38 for social support coping and for passive coping were 3.69 for wishful thinking coping and 2.95 for emotional coping. Self-leadership showed significant difference in terms of satisfaction with major and motivation for application. The six sub-factors of self-leadership and problem-centered coping and wishful thinking coping, the sub-factors of stress-coping, had significant correlations. Self-compensation and constructive thinking were significant factors of self-leadership that affect stress-coping. Conclusions : Based on the above findings, it was found that Dental Hygiene students' self-leadership is related to the use of efficient stress-coping. Therefore, it would be necessary to develop and apply educational approaches to improve their self-leadership so they can efficiently cope with various stressors that they will face after finding jobs.

• 지질공학
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• 제28권3호
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• pp.349-365
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• 2018

The strain and acoustic emission (AE) signals of Pocheon granite were measured during uniaxial compression tests to investigate microcrack formation and damage. Crack closure, initiation, and damage stresses of each sample were determined through an analysis of the crack volumetric strain and stiffness. The samples experienced four damage stages according to stress levels: stage 1 = crack closure stage; stage 2 = elastic stage; stage 3 = crack initiation stage; stage 4 = crack damage stage. At least 75% of all AE signals occurred in stages 3 and 4, and different AE parameters were detected in the four stress stages. Rise time, count, energy, and duration clearly showed a tendency to gradually increase with the damage stress stage. In particular, the rise time, energy, and duration increased by at least 95% in stage 4 as compared with stage 1. However, the maximum amplitude showed a smaller increase, and the average frequency decreased slightly at higher stages. These results indicate that as the degree of rock damage increases, the crack size grows larger. The crack types corresponding to the AE signals were determined using the relationship between RA (Rise time / Amplitude) values and average frequencies. Tension cracking was dominant in all stress stages. Shear cracking was rare in stages 1 and 2, but increased in stages 3 and 4. These results are consistent with previous studies that reported cracking begins after samples have already been damaged. Our study shows that the state of rock damage can be investigated solely through an analysis of AE parameters when rocks are under compressive stress. As such, this methodology is suitable for understanding and monitoring the stress state of bedrock.

• Computers and Concrete
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• 제19권1호
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• pp.59-68
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• 2017

This study focused on modeling the behavior of the compressive stress using the average strain and ultrasonic test results in concrete. Feed-forward backpropagation artificial neural network (ANN) models were used to compare four types of concrete mixtures with varying water cement ratio (WC), ordinary concrete (ORC) and concrete with short steel fiber-reinforcement (FRC). Sixteen (16) $150mm{\times}150mm{\times}150mm$ concrete cubes were used; each contained eighteen (18) data sets. Ultrasonic test with pitch-catch configuration was conducted at each loading state to record linear and nonlinear test response with multiple step loads. Statistical Spearman's rank correlation was used to reduce the input parameters. Different types of concrete produced similar top five input parameters that had high correlation to compressive stress: average strain (${\varepsilon}$), fundamental harmonic amplitude (A1), $2^{nd}$ harmonic amplitude (A2), $3^{rd}$ harmonic amplitude (A3), and peak to peak amplitude (PPA). Twenty-eight ANN models were trained, validated and tested. A model was chosen for each WC with the highest Pearson correlation coefficient (R) in testing, and the soundness of the behavior for the input parameters in relation to the compressive stress. The ANN model showed increasing WC produced delayed response to stress at initial stages, abruptly responding after 40%. This was due to the presence of more voids for high water cement ratio that activated Contact Acoustic Nonlinearity (CAN) at the latter stage of the loading path. FRC showed slow response to stress than ORC, indicating the resistance of short steel fiber that delayed stress increase against the loading path.

• 지역사회간호학회지
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• 제27권1호
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• pp.31-42
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• 2016

Purpose: The purpose of this study was to identify the impacts of job stress and job embeddedness on presenteeism among container terminal workers. Methods: The participants were 299 workers at the S Harbor in P City. Data were collected from April 22 to June 5, 2015. The data were analyzed using t-test, ANOVA, $Scheff{\acute{e}}^{\prime}s$ test, Pearson's correlation coefficients, and logistic regression. Results: These workers on presenteeism were affected by the department of work, annual pay, and exercise of more than 30 minutes per day, revealing a statistically significant difference according to these variables. In other words, when job stress was high, job embeddedness was less, the extent of work impairment was higher, and in turn perceived productivity was lower. Work impairment was 3.11 times higher in workers with above-average job stress than those with lower job stress. Perceived productivity was 2.31 times higher in workers with above-average job embeddedness than those with lower job embeddedness. Conclusion: To reduce work impairment and increase productivity among container terminal workers, it is necessary to decrease their job stress, to increase their job embeddedness, and especially to do exercise for more than 30 minutes a day.

• 가정과삶의질연구
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• 제34권1호
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• pp.33-47
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• 2016

The purpose of this study was to examine factors which influence maternal parenting stress. The subjects were 182 mothers with toddlers 12 to 36 months old living in Seoul and Gyeonggi-do Province. The instruments used for this study were a self-report questionnaire, PDH(Parenting Daily Hassles), EAS(Emotionality, Activity, Sociability), Value of children by Lee et al., PAI(Parenting Alliance Inventory), and burden of the costs of children. The data were analyzed by descriptive statistics, Pearson's correlation and Hierarchical multiple regression using the SPSS 18.0 program. The main results of this study were as follows: First, the mean score of activity temperament, emotional value of children and husband's support were higher than average. The mean score of Emotionality temperament, instrumental value of children, burden of the costs of children and maternal stress were average. Second, maternal parenting stress was positively correlated with emotionality temperament, mother's age, burden of the costs of children, and negatively correlated with emotional value of children, and instrumental value of children, husband's support. Third, emotionality temperament, husband's support, burden of the costs of children, maternal employment status, and instrumental value of children had an impact on maternal parenting stress. It is expected that the results of this study will contribute to providing basic data for establishing a policy to decrease maternal parenting stress.

• 한국산학기술학회논문지
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• 제10권9호
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• pp.2471-2477
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• 2009

본 연구는 치과기공사의 작업환경과 직무스트레스 정도를 분석하고 그 상관관계를 알아보기 위해 서울특별시, 인천광역시, 충남지역의 치과기공사 180명을 선정하고 자기 기입식 설문지를 이용하여 2009년 4월 6일에서 5월 20일까지 조사를 실시하였다. 수집된 자료의 분석결과는 다음과 같다. 1. 연구 대상자의 작업 환경정도를 분석한 결과 건강 항목에서 유의한 차이가 있었다(P<0.05). 작업환경 평균은 1.53 으로 높게 나타났다 2. 연구대상자의 직무 스트레스 유발정도를 분석한 결과 모든 변수에서 유의한 항목은 없었다. 직무 스트레스 평균은 3.44로 높게 나타났다. 3. 작업환경과 직무스트레스의 상관관계는 대부분의 변수가 역 상관관계 가 있는 것으로 나타나 작업환경이 나쁠수록 직무스트레스를 많이 받는 것으로 나타났다.

• 문화기술의 융합
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• 제7권1호
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• pp.202-210
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• 2021

본 연구는 어린이집 원장의 리더십역랑과 직무만족도 간의 관계에서 직무스트레스가 매개효과를 파악하는데 그 목적이 있다. G시 소재의 어린이집 원장 212명을 대상으로 설문조사를 실시하였으며, SPSS 21.0 프로그램을 사용하여 분석하였다. 연구결과, 어린이집 원장의 리더십역량은 조금 높게, 직무만족도와 직무스트레스는 보통수준으로 나타났다. 둘째, 어린이집 원장의 리더십역량과 직무만족도는 정적상관관계를, 원장의 직무스트레스는 리더십역량 및 직무만족도와 부적상관관계를 보였다. 셋째, 어린이집 원장의 리더십역량은 직무만족에 영향을 미치며, 직무스트레스는 리더십역량과 직무만족도 사이에서 부분매개 역할을 수행하는 것으로 나타났다. 본 연구는 성공적인 어린이집 운영을 위해서는 원장의 직무스트레스를 감소시키고 직무만족도를 높여 긍정적인 리더십역량을 발휘할 수 있도록 정책적, 제도적으로 다양한 방안을 모색할 필요가 있음을 시사한다.

• 한국재료학회지
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• 제33권2호
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• pp.54-62
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• 2023

The most comprehensive and particularly reliable method for non-destructively measuring the residual stress of the surface layer of metals is the sin²ψ method. When X-rays were used the relationship of ε_φψ-sin²ψ measured on the surface layer of the processing metal did not show linearity when the sin²ψ method was used. In this case, since the effective penetration depth changes according to the changing direction of the incident X-ray, σ_φ becomes a sin²ψ function. Since σ_φ cannot be used as a constant, the relationship in ε_φψ-sin²ψ cannot be linear. Therefore, in this paper, the orthogonal function method according to Warren's diffraction theory and the basic profile of normal distribution were synthesized, and the X-ray diffraction profile was calculated and reviewed when there was a linear strain (stress) gradient on the surface. When there is a strain gradient, the X-ray diffraction profile becomes asymmetric, and as a result, the peak position, the position of half-maximum, and the centroid position show different values. The difference between the peak position and the centroid position appeared more clearly as the strain (stress) gradient became larger, and the basic profile width was smaller. The weighted average strain enables stress analysis when there is a strain (stress) gradient, based on the strain value corresponding to the centroid position of the diffracted X-rays. At the 1/5 I_max max height of X-ray diffraction, the position where the diffracted X-ray is divided into two by drawing a straight line parallel to the background, corresponds approximately to the centroid position.