• 한국환경보건학회지
• /
• 제50권2호
• /
• pp.157-167
• /
• 2024

Background: Several previous studies have shown that commuting is a source of stress for undergraduate students. However, few studies have investigated the effect of commuting on academic stress among undergraduate students, and there has been little awareness of the environmental impact of commuting. Objectives: To evaluate the associations between commute type and/or time and academic stress among undergraduate students in South Korea, focusing on environmental sustainability. Methods: We conducted an online survey and obtained information on commute types, commute times, and academic stress from 510 undergraduate students aged ≥19 years. Academic stress was comprised of five sub-categories of stress, and total academic stress ranged from 5 to 25 points. Multiple linear regression analysis was used to analyze the associations between commute type and commute time and academic stress. Furthermore, the students were grouped into 21 categories based on their transportation mode for commuting. CO₂ emission factors per each commuting category were calculated using the transportation type's CO₂ emission data from previous studies. Spearman's correlation analysis was used to confirm the correlation between CO₂ emission factors and total academic stress. Results: Students using home-to-school transportation without transfers (vs. walking) showed a significantly higher total academic stress of 2.19 points (95% CI: 0.58, 3.80). In contrast, students using school-to-home transportation without transfers (vs. walking) showed a significantly lower total academic stress of 1.96 points (95% CI: -3.55, -0.38). Moreover, students using transportation with lower CO₂ emission factors had lower academic stress scores (home-to-school: correlation coefficient = 0.507, p<0.001; school-to-home: correlation coefficient = 0.491, p<0.001). Conclusions: Our findings suggest that both commute type and time are significantly associated with academic stress among South Korean undergraduate students. When students select environmentally-friendly transportation, they may not only improve their mental health but also improve climate resilience.

• 복합신소재구조학회 논문집
• /
• 제7권1호
• /
• pp.25-31
• /
• 2016

Bond stress between cast-in-place ductile fiber reinforced cementitious composites and CFRP plank were experimentally analyzed. As failure shape, the mixture of failure between CFRP plank and epoxy, and failure between concrete and epoxy was shown. In case of RFCON from the suggested simple bond slip relationship, the maximum average bond stress was 5.39MPa, the initial slope was 104.09MPa/mm, and the total slip length was 0.19mm. PPCON showed the maximum average bond stress of 4.31MPa, the initial slope of 126.67MPa/mm, and the total slip length of 0.26mm, while RFCON+ appeared to have 8.71MPa, 137.69MPa/mm, 0.16mm. PPCON+ had 6.19MPa maximum average bond stress, 121.56MPa/mm initial slope, and 0.34mm total slip length. To comprehend the behavior of composite structure of FRP and concrete, local bond slip relation is necessary, and thus a simple relation is suggested to be easily applied on hybrid composite system.

• 임상간호연구
• /
• 제14권1호
• /
• pp.139-150
• /
• 2008

Purpose: The aim of this study was to develop instrument measuring the relocation stress syndrome for patients transferred from intensive care unit to general ward in Korea. Method: For item construction, components were drawn from an extensive review of the literature, existing instruments and the result of qualitative approach. A total 48 items were selected for the first draft. Ten experts evaluated this instrument for content validity and the number of items was reduced to 29. To refine and test reliability and validity of the instrument, data were collected from the 594 patients following transfer from intensive care unit. Results: Preliminarily twenty-nine items were generated through content validity and a pilot study. Using corrected items to total correlation coefficient, this instrument was further shortened to a 25 item scale. Factor analysis extracted a total of 23 items with a 5-point Likert-type scale. Relocation Stress Syndrome (RSS) included three subscales; physical factors (12 items), Patient's recognition to health care providers (8 items), and emotional factors (3 items). The RSS established content validity, construct validity, and reliability. Conclusion: This instrument demonstrates good reliability and validity, and therefore it is an appropriate measurement of assessing relocation stress syndrome in ICU to ward transition period.

• 한국직업건강간호학회지
• /
• 제28권3호
• /
• pp.176-185
• /
• 2019

Purpose: The purpose of this study was to identify the effects of job stress, emotional labor, and positive psychological capital on the job satisfaction of physician assistants (PAs). Methods: The sample consisted of 166 PAs working in general hospitals in B city, Y city, and C city. Data were analyzed through the SPSS/WIN 18.0 program using t-test, ANOVA, $Scheff{\acute{e}}$ test, Pearson's correlation coefficients, and multiple regression. Results: The factors of job stress (${\beta}=-.488$, p<.001), positive psychological capital (${\beta}=.188$, p=.004), and total clinical career (${\beta}=-.147$, p=.014) had the greatest influence on the level of job satisfaction experienced by the PAs. The total explanatory power was 49.9%. Conclusion: It was found that job stress, positive psychological capital, and total clinical career were influencing factors in the job satisfaction of PAs. Therefore, to improve their job satisfaction, it is necessary to develop strategies to manage the job stress experienced by PAs, and to strengthen and develop positive psychological capital.

• 한국윤활학회:학술대회논문집
• /
• 한국윤활학회 2004년도 학술대회지
• /
• pp.245-248
• /
• 2004

The press cutter is productive equipment that practically manufactures materials such as fabrics, papers, films, leathers, rubbers etc. into the desired shapes using cutting method. Plate cutting process is one of the primary energy absorbing mechanisms in a grounding or collision event. The cutting mechanism is complicated and involves plastic flow of plate in the vicinity of the tip, friction between wedge and plate, deformation of plate. In this paper, we studied the effect of friction between cutter and plastic sheet for producing precise and superior products. The press cutter is analyzed numerically using MARC finite element program according to the variation of friction coefficients. The FEM results showed that normal stress, equivalent cauchy stress, normal total strain, equivalent total strain are good when friction coefficient is 0.0 and shear stress, shear total strain are good when friction coefficient is 0.8.

• Journal of Ecology and Environment
• /
• 제34권3호
• /
• pp.251-257
• /
• 2011

The purpose of this study was to investigate the acclimation responses of Tamarix chinensis to cold stress. We evaluated the acclimation responses by measuring biomass, daily elongation rate, chlorophyll content, and total soluble carbohydrate content. The plant samples comprised leaves from seedlings of 2 different ages (8 and 12 weeks); the leaves were collected 0, 2, and 4 weeks after cold treatment. We found that the cold-treated samples showed reduced daily elongation rates and chlorophyll content. Further, these samples showed more than 8-fold increase in the total soluble carbohydrate content. However, the seedling ages did not have a significant influence on the growth of cold-treated seedlings. On the basis of these findings, we can conclude that T. chinensis seedlings aged less than 1 year old show acclimation to cold stress by accumulating soluble carbohydrates. This study may help us understand how T. chinensis seedlings acclimatize to their first cold season.

• 한국생산제조학회지
• /
• 제19권3호
• /
• pp.321-325
• /
• 2010

This study analyzes the results with the simulation of heat transfer, structural stress, fatigue and vibration on main parts of engine. The maximum temperature is shown by $300.73^{\circ}C$ on the upper part of piston with the heat transfer. Maximum total deformation or equivalent stress is shown by 65.31mm or 21364MPa respectively at the upper plane of piston with the structural analysis inclusive of heat transfer. The minimum life is shown by the cycle less than $10^7$ at the part of crankshaft with the fatigue analysis. The frequency with the maximum amplitude of deformation is shown by 14Hz. Maximum total deformation or equivalent stress is shown respectively by 93.99mm on the upper plane of piston or 42625MPa at the part connected with crack shaft and connecting rod at 14Hz. The durability of engine design can be verified by using the analysed result of this study.

• 기본간호학회지
• /
• 제19권2호
• /
• pp.168-178
• /
• 2012

Purpose: The purpose of this study was to compare self-care behavior, diabetes-related stress and stress coping style among 3 blood glucose control groups (good, inadequate, and poor blood glucose control groups). Methods: Participants were 102 type 2 diabetic patients (good group: 41, inadequate group: 31, poor group: 30). Data were collected from Feb 19 to Mar 24, 2010 and were analyzed using Chi-square, Fisher's exact test and ANCOVA with SPSS/WIN 12.0. Results: Using ANCOVA with frequency of admission, and illness duration as covariates, significant differences were found among the 3 groups in self-care behavior (total score) and the exercise subscale. Using ANCOVA significant differences were found among 3 groups in diabetes-related stress (total score), emotional burden subscale and regimen distress subscale. Using ANCOVA no difference in stress coping was found among the 3 groups, but there was a significant difference in the problem-oriented coping subscale. Conclusions: Self-care behavior, diabetes-related stress, and stress coping style are factors influencing blood glucose control. The results of this study suggest that for improving blood glucose control, self care education program focused on diet and exercise in addition to stress management program for promoting problem oriented coping capability are recommended.

• 한국염색가공학회지
• /
• 제10권2호
• /
• pp.45-54
• /
• 1998

This study surveys relation between thermal shrinkage and thermal stress properties after process simulation of heat treatment with various PET filament yarns. For this purpose, 12 kinds of regular yarns and POY, 6 kinds of DTY and 5 kinds of composite yarns were experimented for investigating step thermal shrinkage, total thermal shrinkage and total thermal stress and maximum thermal stress temperature. Thermal stress and shrinkage of the various specimens treated with wet and dry heats were analysed and discussed with the conditions of heat treatment. finally, relationship between thermal stress and shrinkage of the various PET filaments such as regular yarns, POY, DTY and composite yarns were investigated with the PET filament characteristics.

• The Journal of Korean Physical Therapy
• /
• 제6권1호
• /
• pp.49-60
• /
• 1994

Stress is experienced when a person tries to maintain stability in the face of life change but is not able to meet the adaptive demands of change. This can be especially true for the parents who has a cerebral palsy childs who needs long term rare, where parents, are the primary source of care and responsibility. Successful coping leads to maintenance of the parents role and this has an effect on the health status of the child. This descriptive study was attempted to identify stress factors, levels and helpful coping patterns for parents who must take care of cerebral palsy children. Data were collected from 43 subjects who were parents of children diagnosed with cerebral palsy The informations gathered from March 25, 1994 to April 14, 1994 by means of structured questionnaires were analyzed. Two instruments were used to collect the data 1) Lee's stress questionnaire consisted of 33 stress factors and measured by four point Likert scale. 2) Modified Chronic Health Inventory for parents: The modified CHIP included 43 items of coping methods with four point Likert scale. The results of this study were as follows: 1) Stress items could have a maximum score of three points, for a total possible score of 132 points. The mean score for the total was 92.02 points. The item mean score was 2.85 points showing that the parents were experiencing moderate to much stress. 2) The items with the highest stress items were 16 items. The stress items with the lowest mean scores were 10 items. 3) Of the stress categories: The highest stress category was related to changes in the illness status of the child and difficulty in taking rare of the child. The second stressful category was related to the prognosis of the child's condition. The least stress was noticed to social-personal relationships and the responsibility of the care givers. 4) Items measuring coping in the parents had a maximum score of three points each with a total possible roping score of 172 points. The mean score for the total was 103,9 paints. The item mean score was 2.42 points indicating that there were responses of little helpful to moderately helpful on each coping pattern. 5) The most helpful coping items were 7 items. The least helpful coping items were 2 items. 6) Effectiveness of the coping for each patterns was examined : Understanding the illness condition from communication with parents of children with the same condition and consultation with the medical team was the most helpful coping pattern. Family's coorperation and integration and optimism were a moderately helpful coping pattern. Social support psychological stability and self esteem were the least helpful toping pattern. In conclusion, the highest stress for parents of children with cerebropalsy was found to be very stressful changes in the illness of the child and to taking care of a child who is suffering. The parents were helped by the coping methods using understanding of the illness condition through consultation with the medical learn and communication with parents in the same situation. Based on the knowledge, care could develop intervention strategies appropriate for them, help them to develop their effective coping patterns, and give support them in the process of coping with their stress.