• Journal of Korean Society of Occupational and Environmental Hygiene
• /
• v.29 no.1
• /
• pp.69-81
• /
• 2019

Objective: The purpose of this study was to find out what kind of change in death rate when job stress is solved by calculating job stress relieve coefficient. Methods: This study used the data of the fourth working condition survey. Regression analysis was used to determine the relationship between health effects recognition and Death rate per 10,000 workers. After that the recognizing and non - recognizing groups were categorized by health effects recognition, and the differences between the two groups were confirmed by cross tabulation analysis. Results: Regress analysis P-value is 0.011 and $R^2$ is 0.979. Death rate per 10,000 worker increased with the increase in the number of non - health impact recognizing group. The relieve factors were (1) work culture(2.859) (2) physical environment(2.184), (3) improper reward (1,839), (4) relationship conflict(1.646), (5) job requirement(1.613), (6) job autonomy(1.354), (7) job instability(1.334), And (8) organizational system(1.201). The higher the relieve coefficient is, the higher the probability of belonging to the non - health impact recognizing group when there is no job stress factor. Conclusions: When job stress is resolved, there is a high probability that the health impact recognition is reduced, which can lead to an increase in death rate. but according to previous studies, Job stress can cause accidents by reducing the safety behavior of accidents. The job stress management plan should simultaneously consider reducing job stress and increasing health impact recognition.

• The Journal of Korea Robotics Society
• /
• v.11 no.2
• /
• pp.83-91
• /
• 2016

Most of outdoor mobile robots have a suspension on each wheel in order to relieve the shock by ground obstacles and to improve the driving stability. Typically, in the actual operations, the suspensions have been used under a given set of conditions as all the damping and spring coefficients of the suspensions are fixed. However, it is necessary to readjust the coefficients of the suspensions according to surface conditions that may cause the unstable shaking of a robot body at high speed driving. Therefore, this paper is focused on the mobility analysis of an outdoor robot when the coefficients of suspensions (in particular, damping coefficients) are changed while driving on an uneven road surface. In this paper, a semi-active suspension with twelve damping coefficient levels was used and a small sized vehicle with the suspensions was employed to analyze the mobility dependent on a change of the damping coefficient. And the mobility was evaluated through driving experiments on a bumped slope.

• Tribology and Lubricants
• /
• v.29 no.6
• /
• pp.353-359
• /
• 2013

The rollers and/or races in cylindrical and tapered roller bearings should be profiled to relieve high edge stress concentrations caused by their finite lengths and misalignment. In this study, a numerical analysis was performed to investigate the elastohydrodynamic lubrication (EHL) of a Lundberg profile-type cylindrical roller. A finite difference method with fully nonuniform grids and the Newton-Raphson method were used to present detailed EHL pressure distributions and film shapes, as well as the variations in the minimum and central film thicknesses with the profile modification coefficient. In the Lundberg profile, the maximum pressure and minimum film thickness always occurred near the edges. Proper modification of the Lundberg profile considerably increased the minimum film thickness.

• Journal of the Korean Geotechnical Society
• /
• v.33 no.12
• /
• pp.75-80
• /
• 2017

Permeable block pavement systems are widely used to relieve the flood and enhance water circulation. However, domestic design method has not yet been established well. Although AASHTO 93 flexible pavement design method is applied as a structural design method outside the country, there is a lack of information on layer coefficient of the permeable pavement materials, which makes it difficult to apply the design to various materials. Therefore, in this study, a method of calculating the layer coefficient of permeable block pavement materials by plate load test was presented and the layer coefficient of a permeable block pavement in a testbed was evaluated. Overall, calculated layer coefficient of open graded aggregate and permeable block pavement surface layer were similar to those of the conventional values. The presented method may be used to evaluate layer coefficients of permeable block pavements for design.

• Proceedings of the Korea Contents Association Conference
• /
• 2006.05a
• /
• pp.75-79
• /
• 2006

The Purpose of the study is to analyze the change of the unbalanced national development by the construction of multifunctional administrative city and innovation cities. In this study, index of unbalanced national development is measured by unbalanced distribution of population on national land. Gini's coefficient is used to measure the unbalanced distribution of population. As a result, the construction of multifunctional administrative city and innovation cities will relieve the unbalanced national development. but the effect will be insignificant. For the relief of unbalanced national development, various policy and strategy will have to develop.

• Korean Journal of Occupational Health Nursing
• /
• v.24 no.4
• /
• pp.323-330
• /
• 2015

Purpose: The purpose of this study was to investigate job stress, coping type, and job satisfaction in firefighters. Methods: It was a descriptive study, and 114 subjects were recruited during July to August, 2014. The data were analyzed by t-test, ANOVA (Sheffe's test), and Pearson's correlation coefficient using SPSS/WIN 22.0. Results: The job stress level of subjects was 47.45, coping type was 2.38 and the level of subjects' job satisfaction was 2.97. The job satisfaction was very closely negatively correlated with the job stress (r=-.66, p<.001). Conclusion: These results may contribute to better understanding of stress degree, coping type, and job satisfaction in firefighters. Further follow-up study on firefighters is necessary to relieve their job stress and increase active coping type.

• Korean Journal of Occupational Health Nursing
• /
• v.17 no.2
• /
• pp.146-154
• /
• 2008

Purpose: The purpose of this study is to investigate the degree of job stress and job satisfaction and the relationship between job stress and job satisfaction of Medical Aid Client Managers. Method: Data were collected from 185 Medical Aid Client Managers in 234 areas between April 2-15, 2007. Collected data was analyzed for the frequency, t-test, ANOVA, Pearson's Correlation Coefficient etc. Results: The average score of job stress was 2.6. Job instability was highest as 2.9 and job autonomy was lowest as 2.2. in eight items. When the job stress of Medical Aid Client Managers was converted to 100 point, the average was 51.7 and ranked in upper 50% of Korean woman workers' job stress. Among the eight items, because the relationship satisfaction and the instability of duty regime ranked in upper 25% of Korean woman workers' job stress, those items were identified to have high stress. The average score of job satisfaction was 2.3 out 4.0 which could be interpreted as unsatisfactory. The correlation between the job stress and the job satisfaction demonstrated significant difference. Decrease of the job satisfaction was associated with increase of the job stress. In regard to the eight items, the inverse correlation was demonstrated to be significant in organization, inappropriate compensation, and workplace culture. Conclusion: Medical Aid Client Managers have high stress in carrying out their duties. They have experienced very severe instability in their duty regime. Also, they have felt alienated from their organization and experienced unfair rewards. They had low duty satisfaction but got a heavy workload and experienced overtime work. To relieve job overburden of Medical Aid Client Managers. it was necessary to improve business system and also was necessary to relieve a regional disparity of business charge.

• Journal of Sensor Science and Technology
• /
• v.26 no.6
• /
• pp.438-444
• /
• 2017

In this paper, we focus on optimization of the in-situ phosphorous (P) doping of low-pressure chemical vapor deposited (LPCVD) poly Si resistors for obtaining near-zero temperature coefficient of resistance (TCR) at temperature range from 25 to $600^{\circ}C$. The deposited poly Si films were annealed by rapid thermal anneal (RTA) process at the temperature range from 900 to $1000^{\circ}C$ for 90s in nitrogen ambient to relieve intrinsic stress and decrease the TCR in the poly Si layer and get the Ohmic contact. After the RTA process, a roughness of the thin film was slightly changed but the grain size and crystallinity of the thin film with the increase in anneal temperature. The film annealed at $1,000^{\circ}C$ showed the behavior of Schottky contact and had dislocations in the films. Ohmic contact and TCR of $334.4{\pm}8.2$ (ppm/K) within 4 inch wafer were obtained in the measuring temperature range of 25 to $600^{\circ}C$ for the optimized 200 nm thick-poly Si film with width/length of $20{\mu}m/1,800{\mu}m$. This shows the potential of in-situ P doped LPCVD poly Si as a resistor for pressure sensor in harsh environment applications.

• The Journal of the Korea Contents Association
• /
• v.13 no.9
• /
• pp.334-343
• /
• 2013

This study was conducted to examine the readiness for death and death anxiety among hospitalized cancer patients. A convenience sample of 183 cancer patients admitted to four hospitals in Korea was recruited for this study. Data were collected in 2010. Collected data were analyzed with descriptive statistics, independent t-test, one-way ANOVA, and Pearson's correlation coefficient. The mean scores of readiness for death and death anxiety were 1.99(${\pm}0.69$) and 2.21(${\pm}0.59$) out of 4, respectively. 'Psychological readiness' showed the highest mean score among the death anxiety domains, and 'dying process' had the highest mean score among the death anxiety domains. No statistically significant correlation was found between readiness for death and death anxiety. Readiness for death was statistically significantly different according to age, afterlife beliefs, stage of cancer, duration of disease, and number of symptoms. Death anxiety showed significant difference according to faith in God and afterlife beliefs. Distress in the process of dying needs to be managed for cancer patients and spiritual interventions should be considered to relieve death anxiety.

• Journal of Korean Academy of Nursing
• /
• v.45 no.6
• /
• pp.890-899
• /
• 2015

Purpose: The purpose of this study was to identify the level of distress and posttraumatic growth in fathers of chronically ill children and also, to identify the relation between characteristics of the fathers and children and their posttraumatic growth and to investigate factors that influence posttraumatic growth. Methods: In this study, 48 fathers who visited a university hospital in Seoul, Korea and who gave written consent completed the questionnaire between September 23 and November 19, 2013. Data were analyzed using Mann-Whitney U test, Kruskal-Wallis test, Pearson correlation coefficient and stepwise multiple regression. Results: The level of distress in fathers of chronically ill children was relatively high and the majority of them were experiencing posttraumatic growth. Models including the variable (deliberate rumination, religiousness, optimism) explained 64.3% (F=26.38, p <.001) of the variance for posttraumatic growth. Deliberate rumination (${\beta}=.59$, p <.001) was the most influential factor. Conclusion: The findings demonstrate that it is essential for nurses to intervene and facilitate continuously so as to promote posttraumatic growth and relieve distress in fathers of chronically ill children. Furthermore, it is also necessary for nurses to find ways to develop ideal interventions to activate deliberate rumination and offer spiritual care and help maintain optimism in these individuals.