• Journal of Korean Clinical Health Science
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• v.5 no.1
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• pp.803-807
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• 2017

Purpose . The purpose of this study was to investigate the stress level and sleep type on university students at health series. Method . This research conducts a survey of 250 university students on health series. The research tools were structured questionnaires. The questionnaire about stress was measured using psychological stress questionnaire in life stress and sleep type was measured using the Korean Translation of Composite Scale of Measuring Morningness-Evening. Result . In this study, university students 16.4% of the students were at warning. The morning sleep types were 55.2% in all health series university students but slee type was not in the most of sleep type. There were not correlation between the sleep type and stress level. Conclusion . It is seems to need to management of stress on university students at health series.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.29 no.1
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• pp.108-118
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• 2019

Objective: The purpose of this study was to investigate the effects of occupational stress factors on the level of stress and depression of entertainment program producers and entertainment program writers. Methods: This study was based on analysis of a survey collected by 65 respondents out of 224 questionnaires who are entertainment program PDs and entertainment program writers. The survey was conducted from December 20, 2017 to February 20, 2018. Results: In the logistic regression analysis conducted to investigate the factors affecting the stress level in the job-related characteristics of a) higher total career, b) shorter working period in the current firm, c) longer weekly working hours and d) more count of weekend work, the results found higher stress levels. In the sub-factors of job stress, the stress level encountered by respondents was significantly higher for those with a) higher job demand, b) lower insufficient job control and c) higher job instability. In the logistic regression analysis conducted to investigate the factors affecting depression, the depression level in entertainment PD was higher than the entertainment writer in the sociodemographic characteristics. In the sub-factors of job stress, the stress level was significantly higher for those with higher job demand, lower insufficient job control, and higher job instability. For job-related characteristics, depression was significantly higher for longer weekly working hours. Conclusions: Entertainment program producers and entertainment program writers suffer from psychosocial stress and depression which are caused by excessive job demands, lack of job autonomy and job instabilities. Those factors must be managed and also their workweek should be shortened.

• The Journal of Advanced Prosthodontics
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• v.12 no.5
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• pp.316-321
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• 2020

PURPOSE. The stress distribution and microgap formation on an implant abutment structure was evaluated to determine the relationship between the direction of the load and the stress value. MATERIALS AND METHODS. Two types of three-dimensional models for the mandibular first molar were designed: bone-level implant and tissue-level implant. Each group consisted of an implant, surrounding bone, abutment, screw, and crown. Static finite element analysis was simulated through 200 N of occlusal load and preload at five different load directions: 0, 15, 30, 45, and 60°. The von Mises stress of the abutment and implant was evaluated. Microgap formation on the implant-abutment interface was also analyzed. RESULTS. The stress values in the implant were as follows: 525, 322, 561, 778, and 1150 MPa in a bone level implant, and 254, 182, 259, 364, and 436 MPa in a tissue level implant at a load direction of 0, 15, 30, 45, and 60°, respectively. For microgap formation between the implant and abutment interface, three to seven-micron gaps were observed in the bone level implant under a load at 45 and 60°. In contrast, a three-micron gap was observed in the tissue level implant under a load at only 60°. CONCLUSION. The mean stress of bone-level implant showed 2.2 times higher than that of tissue-level implant. When considering the loading point of occlusal surface and the direction of load, higher stress was noted when the vector was from the center of rotation in the implant prostheses.

• Journal of Families and Better Life
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• v.14 no.4
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• pp.219-232
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• 1996

This study was investigated the perceived level of stress and the coping method which the adolescent were confronting. The subject of this investigation was high school students who resided in the City of Pusan. Life Event Scale and Coping Methods Scale were used as the methods for examination. The data were analyzed using M, SD, t-test one-way ANOVA scheffe-test and Pearson's correlation related with this study problem were tested. The results of this study are as follows: 1. The perceived level of teenager's stress was little low with M=1.65 When dividing sphere of perceived level the stress by school problem was the highest and the circumstance problem personal one family one and a companion one are followed in regular sequence. 2. It was found that degree of stress made a difference according to the sex course grade school year religion parents's presence or absence SES the satisfactory degree of school life the satisfactory degree of school life the satisfactory degree of home life and the rearing attitude of parents. 3. As the coping score of teenager's stress was M=2.54. The short-term coping method was higher compared with the long-term one regarding coping methods. 4. It was found that the coping method of stress differed from each other according to variables of sex school year the satisfactory degree of school life and the satisfactory degree of home life. 5. It was found that the perceived level of stress had negative correlation with the coping method and especially long-term coping method had higher negative correlation.

• Journal of Ocean Engineering and Technology
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• v.17 no.2
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• pp.54-59
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• 2003

The characteristics of the parameters for the probability distribution of fatigue crack growth life, using the non-Gaussian random process simulation method is investigated. In this paper, the material resistance to fatigue crack growth is treated as a spatial random process, which varies randomly on the crack surface. Using the previous experimental data, the crack length equals the number of cycle curves that are simulated. The results are obtained for constant stress intensity factor range conditions with stress ratios of R=0.2, three specimen thickness of 6, 12 and 18mm, and the four stress intensity level. The probability distribution function of fatigue crack growth life seems to follow the 3-parameter Wiubull,, showing a slight dependence on specimen thickness and stress intensity level. The shape parameter, $\alpha$, does not show the dependency of thickness and stress intensity level, but the scale parameter, $\beta$, and location parameter, ${\gamma}$, are decreased by increasing the specimen thickness and stress intensity level. The slope for the stress intensity level is larger than the specimen thickness.

• Journal of Oral Medicine and Pain
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• v.39 no.2
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• pp.46-54
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• 2014

Purpose: The aim of this study was to investigate the effects of academic stress and self-control ability on temporomandibular disorder (TMD) of adolescents. Methods: Participants were 1,112 teenagers who were 1st grade students of middle and high school. After checking their academic stress and self-control ability through a self-administrated questionnaire, the students were examined their TMD by two trained dentists. We drew a comparison the level of their academic stress and self-control ability between the students with and without TMD. We divided them to four groups according to the level of academic stress and self-control. And we checked prevalence of TMD in each level. Results: The group of students with TMD was higher academic stress score level than the students without TMD (p<0.05). And they had lower self-control score level than the students without TMD (p<0.05). Even if they were under the same academic stress, the group of students with higher self-control score was less TMD prevalence than the students with lower score. Conclusions: Academic stress makes adolescents to increase TMD and high ability of self-control makes them to decrease it. And these tendencies are seemed to have a great influence on young male student.

• BMB Reports
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• v.29 no.5
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• pp.393-397
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• 1996

Sprague-Dawley male rats (150 g) were chronically treated with 5 v/v % ethanol admixed with nutritionally complete liquid diet and fed ad libitum for 3 weeks. Controls were pair fed with the isocaloric sucrose liquid diet. One half of each group was exposed to cold stress at $4^{\circ}C$ either for 24 h (for determination of mRNA by in situ hybridization) or for 48 h (for determination of enzyme activity). Chronic ethanol treatment (ethanol) did not affect tyrosine hydroxylase (TH) mRNA level in locus coeruleus (LC) of brain and adrenal medulla (AM) compared to controls. Cold stress showed strong increase of TH mRNA level in LC and AM compared to controls. Pretreated ethanol reduced the increased TH mRNA level by cold stress in LC and AM. Ethanol did not affect TH activity in LC and adrenal glands (adrenals). Cold stress increased TH activity in LC but not in adrenals. Pretreated ethanol did not reduce the increased TH activity by cold stress in LC but this result was not shown in adrenals. It is suggested that ethanol does not affect the message level and enzyme protein level for TH in LC and AM in normal rat. It is also hypothesized that pretreated ethanol reduces the magnitude of acute cold stress response, that is induction of TH mRNA in LC and AM, and does not reduce the increased TH enzyme protein that is also acute cold stress response in LC.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2002.10a
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• pp.301-306
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• 2002

The characteristics of parameters for the probability distribution of fatigue crack growth lives by the non-Gaussian random process simulation method is investigated. In this paper, the material resistance to fatigue crack growth is treated as a spatial random process, which varies randomly on the crack surface. Using the previous experimental data, the crack length - the number of cycles curves are simulated. The results are obtained for constant stress intensity factor range conditions with stress ratio of R=0.2, three specimen thickness of 6, 12 and 18mm, and the four stress intensity level. The probability distribution function of fatigue crack growth lives seems to follow the 3-parameter Wiubull and shows a slight dependence on specimen thickness and stress intensity level. The shape parameter, ${\alpha}$, does not show the dependency of thickness and stress intensity level, but the scale parameter, ${\beta}$, and location parameter, ${\upsilon}$, are decreased by increasing the specimen thickness and stress intensity level. The slope for the stress intensity level is larger than the specimen thickness.

• Korean Journal of Childcare and Education
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• v.14 no.6
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• pp.53-67
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• 2018

Objective: This study aimed to investigate the effect of parent- teacher communication on childcare teacher's job stress and turnover intention. This study also examined if the level of active stress coping used functions as a moderator in relationships among parent-teacher communication, childcare teacher's job stress, and their turnover intention. Methods: To achieve this, this study used data from 223 surveys from childcare teachers and analyzed the data with SEM and multi-group SEM analysis methods. Results: First, parent-childcare teacher communication influenced the teacher's turover intention through job stress. Second, the effect of parent-childcare teacher communication on job stress was not found in the higher-level of the active stress coping group. This was different from the significant effect in the lower-level of the active stress coping group. Also, parent-childcare teacher communication influenced teacher's turnover intention through job stress in the lower-level of the active stress coping group. In contrast, the mediation effect was not shown in the higher group. Conclusion/Implications: The results of this study show the effect of parent-childcare teacher communication on teacher's job stress and their turnover intention. Also, this study shows that the level of active stress coping could moderate the relationship among parent-childcare teacher communication, teacher's job stress, and their turnover intention.

• Korean Journal of Adult Nursing
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• v.21 no.6
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• pp.639-651
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• 2009

Purpose: This study examined relationships among stress, stress coping strategies, and somatization in mothers-in-law from multi-cultural families in a rural area. Methods: Elderly mothers-in-law (n=227) living with foreign daughters-in-law completed a self-reporting questionnaire. Data were collected from April to August 2009. Questions related to stress (Visual Analog Scale, VAS), coping strategies (Coping Strategy Scale) for stress, and somatization (Symptom Check List 90, Revised). SPSS/WIN 12.0 program was used for descriptive analysis, t-test, one-way ANOVA, Pearson correlation, and multiple regression analyses. Results: Subjects had a moderate level of stress (5.03). There were significant differences in stress level according to age, educational level, religion, chronic disease, health status, number of children, agreement of an international marriage of her sons, satisfaction in living with a foreign daughter-in-law, and family conflict. Stress showed a significant positive correlation with offensive coping strategy, passive strategy, and somatization. Stress, offensive coping strategy, and passive coping strategy affected the level of somatization. Conclusion: In a family situation involving co-habitation of mother- and foreign daughter-in-law, increased stress experienced by the mother-in-law can lead to increased offensive and passive coping strategies, and increased somatization. More effective means of stress reduction are needed for mothers-in-law from multi-cultural families.