• Journal of the Korean Society for Precision Engineering
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• v.25 no.6
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• pp.159-167
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• 2008

Cooling lubricants are used in machining operations in order to reduce friction at the tool-chip and tool-workpiece interfaces, cool both chip and tool, and remove chip. Furthermore, they influence a strong effect on the shearing mechanisms and, consequently, on the machined surface quality and tool wear. However, several researchers state that the costs related to cutting fluids is frequently higher than those related to cutting tools. Moreover, the cooling lubricants cause an increase in both worker's health and social problems related to their use and correct disposal. Therefore, many researchers have focused on the environmentally conscious machining technologies. One of the technologies is known as MQL(Minimum Quantity Lubrication) machining. In this paper, an experimental model to obtain the optimal cutting conditions in MQL turning was suggested, and the effects of cutting conditions on surface roughness and cutting force were analyzed. For these purposes, FFD (Fractional Factorial Design) and RSM (Response Surface Methods) were used for the experiment. Cutting force and surface roughness with different cutting conditions were measured through the external cylindrical turning of Al 6061 based on the experiment plan. The measured data were analyzed by regression analysis and verification experiments with random conditions were conducted to confirm the suggested experimental model.

• Journal of the Korean Society of Physical Medicine
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• v.12 no.2
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• pp.113-120
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• 2017

PURPOSE: The purpose of this study was to investigate the effect of a physical therapy-based tailored exercise program on pain, accident incidence rates, the number of work days lost, and economical loss cost for workers in an automobile parts manufacturing company. METHODS: A total of 530 workers with musculoskeletal symptoms were given a physical therapy-based tailored exercise program twice a week, for one hour a day. This exercise program consisted of movement pattern correction, muscle stretching and strengthening, and postural correction exercises, according to principles of movement impairment syndromes and medical training therapy. From 2011 to 2016, the lost days of work, accident incidence rates, and loss cost were examined. The pain measured by VAS (visual analogue scale) and the number of workers participating in the exercise program from 2014 to 2016 were also measured. The single subjects A-B design was applied and analyzed. RESULTS: After applying the exercise program, pain decreased and the number of workers participating in the program increased. Accident incidence rates, number of work days lost, and economical loss cost decreased. There was a significant correlation between the number of workers who received exercise therapy by year and accident incidence rates, lost days of work, and economical loss cost (p<.05). CONCLUSION: It is necessary to expand the physical therapy-based tailored exercise program to prevent musculoskeletal disorders because it has a positive effect on both workers and employers.

• Journal of Digital Convergence
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• v.17 no.10
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• pp.293-300
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• 2019

The purpose of this study was to analyze turnover intention among non-regular workers in university hospitals. The data was 292 non-regular workers in 7 university hospitals from December 1 to December 31, 2017. ANOVA, t-test were used for analysis of difference by general characteristics, and multiple regression analysis was performed to analyze the effect on turnover intention. The results of the study are as follows. Unjust working environment, employment instability, discrimination experience were found to have a positive(+) effect on turnover intention. Job satisfaction, age, employment type had a significant negative(-) effect on turnover intention. In particular, high discrimination experience of non-regular workers, who occupy a large part of the hospitals in the increasingly competitive medical market, and high turnover intention can be a negative impact on good medical service and hospital management. The government should establish policies for non-regular workers and hospitals need practical changes in welfare, wages and working environment for non-regular workers.

• The Journal of the Korea Contents Association
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• v.19 no.5
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• pp.350-362
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• 2019

The purpose of this study was to examine the effects of job characteristics and health on accident experience by analyzing the data of transportation workers according to age. The analysis used data from 'the fourth Korean Working Conditions Survey(KWCS)'. A total of 1,997 transport workers data were finally analyzed, and correlation analysis, crossover analysis and logistic regression analysis were performed. It was confirmed that there was no correlation between the age of the transport workers and the accident experience. In the relationship between the characteristics of transportation workers and the experience of the accident, it was found that, in the case of older workers, there was a significant effect in the order of 'at mistake someone else hurt', 'musculoskeletal problem', 'cardiovascular problem' and 'repetitive movements of hands or arms', the model explaining power was 56.9%(p <.01). In the case of non-older workers, it was found that 'depression and anxiety disorder', 'relationship between job and safety', 'at mistake someone else hurt' and 'labor union', the model explaining power was 21.8%(p <.01). Therefore, in order to promote prevent accidents of transportation workers in future, it is necessary to consider various variables such as health and job characteristics besides age.

• Journal of dental hygiene science
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• v.9 no.3
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• pp.265-270
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• 2009

This research provides the point of view by operating SPSS(14.0) about effective management and marketing focusing on customer by comparing and analyzing the effect which affects loyalty for the dental clinic and the rapport occurring when the dental worker communicates affirmatively with customers. The data was gathered from 300 customers visiting to a private dental clinic through the self-administered questionnaire in Jinju, Gyeng-nam. The communication(.017) and value property(.006) of service provider affects the rapport significantly. Last, the trust(.000), value property(.023) and the rapport(.000) affect the loyalty-a result variable-significantly.

• Research in Community and Public Health Nursing
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• v.13 no.1
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• pp.17-29
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• 2002

This study was carried out to investigate the effect of Self-foot reflexology (SFR) on the hypertension of workers. The purpose of the research was to evaluate: levels of knowledge, physical and emotional condition, work stress and fatigue on the hypertension of employees in the workplace. Quasi-experimental study was designed in the setting of a nonequivalent control and experimental Group applied by the pre and post test. The total subjects undertaken in the study were total of 34 employees working in three companies in Seoul. The SFR program was consisted of 6 phases. There were 2 minutes for preparation, 4 minutes for slow down, 26 minutes for base reflex, symptoms of a disease reflex and excretion reflex stimulation. Finally, there was 20 minutes relaxation in a comfortable posture and drinking hot water after blood pressure was checked in the order. This program was running 55 minutes a day everyday three times a week during the entire 8 week course. The finding showed blood pressure was reduced significantly. Moreover, the level of total cholesterol. high and low density lipoprotein cholesterol, depression, work stress, and fatigue were decreased in the study. But, they were not statistically significant except as it related to Group comparisons in time. The level of state anxiety was statistically significant between 2 Groups, but not in the time comparison of both Groups. As a summary of the study results, the SFR program was regarded as contributing to the physical and emotional promotion of employees. It had partially increased body circulations of functional organ related to the SFR sites. And, it improved relaxation of physical and mental condition through energy movement 'Chi'. Therefore, the SFR technique should be considered as an effective skill of a nursing program. Furthermore, it can be newly adopted as a nursing curriculum as a part of alternative treatment. However, it still needed to testify its effects through the review study.

• Korea Journal of Hospital Management
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• v.21 no.3
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• pp.22-36
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• 2016

This study aims to analyze the effects of job satisfaction on turnover intention among the nurses in geriatric hospitals. In terms of study methods, this study developed structured questionnaires, and distributed them to nurses working in 11 geriatric hospitals in metropolitan area. A total of 418 questionnaires (response rate: 87.0%) were used for final analysis. We conducted multiple regression analyses to analyze the influence of job satisfaction on turnover intention, adjusting for the characteristics of the research subjects. The results of this study are as follows. First, both job satisfaction and turnover intention were statistically significantly related to individual and hospital characteristics. Second, turnover intention was lower in older age group, and higher in smaller hospitals. As job satisfaction increases, turnover intention decreases. Third, the results of the regression analysis adjusting for subject's characteristics and job satisfaction's sub-categories show that the turnover intention is lower in nurses who are older, day worker, and work in bigger hospitals. Fourth, the result of subgroup analysis by hospital volume show that both of two groups are influenced by hospital ownership and satisfaction about compensation. In addition, professionalism had a significant effect on decreasing turnover intention in smaller hospitals. However, there was no statistically significant relationship between job satisfaction's sub-categories and turnover intention in larger hospitals. The results of this study confirms that job satisfaction lowers turnover intention among nurses in geriatric hospitals. It is suggested that the administrators of those hospitals continue to monitor critical factors associated with job satisfaction, and thus, reduce turnover intention, which helps improve quality of services.

• Korean Journal of Occupational Health Nursing
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• v.20 no.2
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• pp.113-118
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• 2011

Purpose: The purpose of this study was to examine effects of smoking cessation program in large size company using motivational enhancement counseling. Methods: A quasi-experimental design was conducted. 72 workers in intervention group and 65 workers in control group participated in 7 large size companies. Smoking cessation program consisted of a campaign, smoking cessation education, and 6 weeks motivational enhancement counseling. The motivational enhancement counseling was tailored to the individual's stage of change. Stages of smoking behavior, smoking cessation rate, nicotine dependence, and confidence of smoking cessation were assessed after intervention. Results: The results showed that intervention had a significant impact on improving stages of smoking behavior and smoking cessation rate, and impact on decreasing nicotine dependence, compared to those of a control group. Conclusion: The effects and feasibility of smoking cessation program including motivational enhancement counseling were revealed in the large size company. These results might provide information that can be used in improving cultures of smoking cessation for workers.

• Journal of Nutrition and Health
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• v.1 no.3_4
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• pp.197-200
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• 1968

Using the $Methionine-2-C^{14}$, the metabolism of methionine to the experimental rats on rice diet was studied comparing with that to the rats on stock diet in this paper. The National Institute of Health strain of weaning albino rats were housed into the individual cages deviding into 2 groups, the rice diet (RD) group and the stock diet (SD) group, and fed on rice diet and stock diet respectively for 10 weeks. On the day of experiment, the rats were parenterally administered. the $methionine-2-C^{14}$ solution after fasting over night. And then the rats were sacrificed by ether anesthesia by time being of one, three, six, and twelve hours each and the organs, pituitary gland, pancreas, spleen, liver, and kidney, were taken out for the determinations of radioactivities. And also the excretion of radioactivities through urine were determined by time being. The radioactivities were determined by Autoscaler SC-51 using the planchets. The results of radioactivities of urine excretion were shown at table 3 and the results of radioactivities distibutions in the organs by time being after parenteral administration of $methionine-2-C^{14}$ were shown table 4 in the original paper. According to the results, the following are summarized; 1. The growth experiment result of rats on. rice diet and stock diet were same as shown by the previous workers indicating significant growth inhibition at the rice diet group. 2. Due to the result of radioactivity excretion through urine after administration of $methionine-2-C^{14}$, it might he considered that methionine in the rice diet seems to be limited. However, it seems to be not 주 mostly limited. 3. And due to the results of radioactivity distribution in the organs by time being, the radioactivity in the liver tissue showed appearently higher readings at this methionine study compared with the results at the lysine study shown by HAW and his co-worker. This might be interpreted, though it is not clear, that liver might require methionine as a deficient amino acid at the tissue because methionine is limited at the rice diet.

• Korean Journal of Adult Nursing
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• v.27 no.5
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• pp.537-547
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• 2015

Purpose: The purpose of this study was to examine the effects of emotional labor, somatic symptoms, and emotional support on quality of life among middle-aged women workers. Methods: The study design was a descriptive survey research. Data were collected from October 2013 to January 2014 in Korea. A self-reported questionnaire was administerd in a convenience sample of 264 middle aged women in various working places. The survey included socio-demographic and job-related factors, and the questionnaires about emotional labor, somatic symptoms, emotional support, and quality of life. Data were analyzed using descriptive statistics, t-test, ANOVA, pearson's correlation coefficient, and stepwise multiple regression. Results: Stepwise multiple regression showed that somatic symptoms had the greatest effect on quality of life (${\beta}=-1.65$, p<.001), followed by emotional support (${\beta}=0.67$, p<.001), and job satisfaction (${\beta}=3.98$, p<.001). And these variables accounted for 52% of quality of life among middle-aged women workers (F=97.14, p<.001). Conclusion: These results suggest for clinical nurses to take somatic symptoms, emotional support, and job satisfaction into special account in order to improve the middle aged women worker's quality of life. Ultimately, a health promotion program focusing on these influential variables in workplace need to be developed for the given population.