• Journal of Preventive Medicine and Public Health
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• v.25 no.3 s.39
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• pp.247-268
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• 1992

This study was conducted to evaluate the effect of VDT work on eyes and vision among workers in a TV manufacturing plant. The study subjects consisted of 264 screen workers and 74 non-screen workers who were less than 40 years old male and had no history of opthalmic diseases such as corneal opacities, trauma, keratitis, etc and whose visual acuity on pre-employment health examination by Han's test chart was 1.0 or above. The screen workers were divided into two groups by actual time for screen work in a day : Group I, 60 workers, lesser than 4 hours a day and group II, 204 workers, more than 4 hours a day. From July to October 1992 a questionnaire was administered to all the study subjects for the general charateristics and subjective eye symptoms after which the opthalmologic tests such as visual acuity, spherical equivalent, lacrimal function, ocular pressure, slit lamp test, fundoscopy were conducted by one opthalmologist. The proportion of workers whose present visual acuity was decreased more than 0.15 in comparison with that on the pre-employment health examination by Han's test chart was 20.6% in Group II. 15.0% in Group I and 14.9% in non-screen workers. However, the differences in proportion were not statistically significant. The proportion of workers with decreased visual acuity was not associated with the age, working duration, use of magnifying glass and type of shift work (independent variables) in all of the three groups. However, screen workers working under poor illumination had a higher proportion of persons with decreased visual acuity than those working under adequate illumination (P<0.05) . The proportion of workers whose near vision was decreased was 27.5% in Group II, 18.3% in Group I, and 28.4% in non-screen workers and these differences in proportion were not statistically significant. Changes of near vision were not associated with 4 independent variables in all of the three groups. Six out of seven subjective eye symptoms except tearing were more common in Group I than in non-screen workers and more common in Group II than in Group I (P<0.01). Mean of the total scores for seven subjective symptoms of each worker(2 points for always, 1 point for sometimes, 0 point for never) was not significantly different between workers with decreased visual acuity and workers with no vision change. However, mean of the total scores for Group II was higher than those for the Group I and non-screen workers (P<0.01). Total eye symptom scores were significantly correlated with the grade of screen work, use of magnifying glass, and type of shift work. There was no independent variable which was correlated with the difference in visual acuity between the pre-employment health examination and the present state, the difference between far and near visions, lacrimal function, ocular pressure, and spherical equivalent. Multiple linear regression analysis for the subjective eye symptom scores revealed a positive linear relationship with actual time for screen work and shift work(P<0.01). In this study it was not observed that the VDT work decreased visual acuity but it induces subjective eye symptoms such as eye fatigue, blurred vision, ocular discomfort, etc. Maintenance of adequate illumination in the work place and control of excessive VDT work are recommended to prevent such eye symptoms.

• Journal of Preventive Medicine and Public Health
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• v.27 no.3 s.47
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• pp.547-556
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• 1994

In order to identify the necessary information of biochemical Indices for renal effect of lead for the early detection in medical surveillance of lead worker, the reference values of urinary N-acetyl-$\beta$-D-glucosaminidase (NAG) activities were studied with 205 office workers in one industrial complex area who were not exposed to lead occupationally. While study variables selected for lead exposure were blood lead (PbB), blood zinc protoporphyrin(ZPP) and $\delta$-aminolevulinic acid (DALA) in urine, those for renal effect were urinary N-acetyl-$\beta$-D-glucosaminidase (NAG), blood urea nitrogen (BUN), serum creatinine(Cr), serum uric acid (Ua), and urinary total protein(U-TP). The results obtained were as follows: 1. The mean values of blood lead, ZPP and DALA in all subjects were $14.39{\pm}4.02{\mu}g/dl,\;21.61{\pm}8.00{\mu}g/dl,\;and\;2.73{\pm}0.90mg/l$ respectively. 2. The mean value of urinary NAG activities in all subjects was $3.51{\pm}2.01U/l$. The mean value of urinary NAG activities, which calculated from NAG activities divided by urinary creatinine concentration (CNAG), was $5.42{\pm}5.53U/g$ creatinine and log-arithmic normal distributed. 3. The reference value of urinary NAG activity was 12.06 U/g creatinine(95% CU=10.57-14.76 U/g creatinine). 4. Logarithmic CNAG(r=0.781 p<0.0l), U-TP(r=0.670 p<0.01) and ZPP(r=0.172 p<0.05) showed statistically significant correlation with CNAG.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.178-187
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• 2021

This study is a descriptive correlation study to identify the factors affecting life satisfaction for shift service workers and is a secondary data analysis study using the raw data from the Fifth Korean Work Environment Survey. Five hundred and seventy-seven study subjects were selected from 20-year-old wage workers who had more than one year of work experience at the time of the survey and had worked more than 40 hours a week. The analysis used SPSS 23.0 WIN, including a t-test, one-way ANOVA by Scheffe test, Pearson's correlation oefficients, and Hierarchical multiple regression analysis. Regarding the general characteristics of the subjects, there was a difference in life satisfaction according to age, educational level, industrial type, and subjective health status. The higher the work-life balance and work satisfaction of the shift service worker, the higher the life satisfaction. In addition, social support had a moderating effect on the relationship between work-life balance and work satisfaction of shift service workers. Active social support, work satisfaction, and work-life balance improvement promotion programs were developed and applied to shift work service workers considering the factors influencing life satisfaction, thereby improving the life satisfaction of work shift service workers.

• Journal of dental hygiene science
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• v.18 no.6
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• pp.389-397
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• 2018

The purpose of this study was to examine the self-rated oral health status of industrial workers and influential factors for their work loss caused by dental care in an effort to prepare some information on policy setting about the promotion of the oral health of industrial workers and on the prevention of their oral diseases. The married industrial workers experienced work loss due to dental care more commonly than did the unmarried workers ($x^2=5.10$, p<0.05). In addition, the workers who found themselves to be in worse health experienced significantly more work loss ($x^2=29.69$, p<0.001). The workers who received treatment for oral diseases experienced significantly more work loss than those who did not receive treatment ($x^2=14.60$, p<0.001). In addition, the workers who had oral symptoms requiring treatment experienced more work loss than the others who not ($x^2=11.08$, p<0.01). The experience of not receiving treatment for a perceived oral disease was more dominant among the workers who found themselves to have an oral disease but did not receive treatment than among those who received treatment (p<0.001). Regarding factors affecting the work loss of the industrial workers caused by dental care, the workers whose monthly mean income was larger and who found themselves to be in worse health had significantly more experience of absenting themselves from the office or of leaving work early (p<0.001).

• Journal of Digital Convergence
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• v.16 no.9
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• pp.29-37
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• 2018

The purpose of this study was to investigate factors affecting self-directed learning of workers. For this purpose, 335 workers were surveyed in two cities in the northwestern part of Chungcheongnamdo. The research was carried out by difference test to identify the diffrence of self-directed learning according to general characteristics and by correlation analysis of main variables. Also in order to identify the effect of hope and growth mindset on self-directed learning, hierarchical regression analysis was conducted by diving the group into employee-level and higher employee-level. The main results are as follows. First, Self-directed learning differed by gender. Second, correlation analysis revealed that hope, growth mindset and self-directed learning were positively correlated. Third, regression analysis showed that the pathway thinking of hope and the intelligence of the growth mindset influenced self-directed learning of employee-level workers. And it showed that the pathway thinking of hope influenced self-directed learning of higher employee-level workers. Finally, we discussed policies to enhance workers' self-directed learning based on positions.

• Korean Journal of Social Welfare
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• v.63 no.1
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• pp.291-316
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• 2011

The purpose of this study is to find out the right strategies for social welfare education and the efficient human resource management of public social workers. Not to make any flaws when looking for the appropriate strategies, this report studies how outcomes of social welfare education influences the performances of public social workers and how the empowerment is connected to the relationship between the social welfare education and the performances of public social workers. For clearer study, a survey was conducted for 396 public social workers and the Structural Equation Model by AMOS was used to analyze the outcome. According to the result, the Fitness Index of the Casual Model, proposed by this study, was similarly matched with that of theological model. The Casual Model proved that it explains the connection between social welfare education, job performance and empowerment. Hence, to improve performance of public social workers, various education and training policies for human resources management are needed and basically associates related social welfare education should do their effort. Also to enhance empowerment of public social workers, various measures are needed.

• Journal of Preventive Medicine and Public Health
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• v.27 no.3 s.47
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• pp.597-608
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• 1994

This study was conducted to evaluate the relationships between the environmental exposure and biological monitoring among workers exposed to metallic mercury We interviewed each workers to get the medical history including previous hazardous occupational history. We measured the respiration rate and tidal volume of each worker in order to calculate the 8-hour inhaled mercury of workers. And we wafted to evaluate the effect of exposure duration to mercury concentrations in blood and urine as biologic exposure indices of metallic mercury. The regression and correlation analysis were done to the relationships of 8-hour inhaled mercury and mercury in blood and urine. The results were as follows; 1. The subjects were 35 fluorescent lamp manufacturing workers. The mean age of subjects was .24.8 years old, and the mean work careers of workers was 1.19 years. 89% of the total was consisted man. 2. The correlation coefficients between 8-hour inhaled mercury and mercury in blood and urine were higher than that of only considered air mercury concentration. 3. The correlation coefficients of 8-hour inhaled mercury and mercury in blood and urine were above 0.9 in workers who had exposed to mercury more than 1 year 4. The R-square value and -value of regression analysis between the 8-hour inhaled mercury and mercury in blood and urine was also higher in workers who had exposed to mercury over 1 year than in workers who had less than 1 year working experience. The important results of this study were that relationships between the 8hr-inhaled mercury and mercury in blood and urine was very high than that with air mercury concentration only. And the results were very apparent when considering workers 1 year or more. Therefore we concluded that the work career and respiratory volume of each individuals should be considered in evaluation the, results of biological monitoring of workers exposed to metallic mercury.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.6
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• pp.4040-4047
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• 2015

The purpose of this study was to analyze a change in Post-traumatic Stress Disorder (PTSD) level and the continuity of the effects in music therapy by applying short-term music therapy program in fire fighters with Post-traumatic Stress (PTS). Forty two fire fighters in 3 districts were randomly assigned to experimental group (21 subjects) and control group (21 subjects). Music therapy was applied in totally 10 sessions by two sessions (120 minutes) a day for 5 days. PTS level was measured immediately after the end of program, after 4 weeks, and after 12 weeks. As a result, PTS level has significantly decreased into $8.90{\pm}4.55$ from $26.52{\pm}2.32$ right after the music therapy program(p<0.05). And the effect was shown to be continued significantly up to after 4 weeks($11.95{\pm}4.57$) and after 12 weeks($13.76{\pm}5.62$)(p<0.05). As a result of research, it is considered that the music therapy is effective approach for reduction in PTS as for fire fighters who belong to the group with high risk of PTSD. Accordingly, the application of regular program for managing fire fighters' mental health is understood to likely to contribute to enhancing the field service competence.

• The Korean Journal of Nuclear Medicine Technology
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• v.12 no.3
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• pp.157-170
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• 2008

Purpose: This prospective study was conducted to reveal the haematological index change by low level radiation exposure in radiological environment our hospital workers. Materials and Method: We gathered the cumulative dose by Thermoluminenscent Dosimeters (TLD) over 9-yr period and examined hematological index counts change (RBC, Hb, Platelet, WBC, Monocyte, Lymphocyte, Neutrophilic, Basophilic, Eosinophilic) both occupational workers and controls. Of a total 370 occupational workers and 335 controls were compared. Results: This analysis has led to the following general observations 1) The average cumulative dose in male and female were $9.65{\pm}15.2\;mSv$, $4.82{\pm}5.55\;mSv$ respectively. 2) In both male and female, there were very low relationship between occupation period and cumulative dose (r< ${\pm}0.25$). 3) Occupation period was more increased, in male, WBC counts decreased and increased workers, RBC counts decreased workers were more than controls group (p<0.05). In female, WBC counts decreased and increased workers and W-eosino counts decreased workers were more than controls group (p<0.01). 4) Cumulative dose was more increased, in male, W-Lympho counts decreased workers and Platelet counts deceased workers were more than controls group (p<0.05). In female, W-lympho counts decreased workers and RBC counts decreased workers were more than controls group (p<0.05). Conclusions: We can find some kinds of blood index abnormal distribution in occupational radiation workers by comparing with controls. Occupational workers cannot avoid radiation exposure, in spite of the control it. Actually low level radiation adverse effect occurred not dose but probability. So workers must always try to reduce exposure by ourselves, furthermore as long as possible the government should provide rapidly that national system on radiation control for worker's health.

• KDI Journal of Economic Policy
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• v.31 no.2
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• pp.127-153
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• 2009

There is a growing concern about potential harmful effect of second-hand or environmental tobacco smoking. As a result, smoking bans in workplace become more prevalent worldwide. In Korea, workplace smoking ban policy become more restrictive in 2003 when National health enhancing law was amended. The new law requires all office buildings larger than 3,000 square meters (multi-purpose buildings larger than 2,000 square meters) should be smoke free. Therefore, a lot of indoor office became non smoking area. Previous studies in other counties often found contradicting answers for the effects of workplace smoking ban on smoking behavior. In addition, there was no study in Korea yet that examines the causal impacts of smoking ban on smoking behavior. The situation in Korea might be different from other countries. Using 2001 and 2005 Korea National Health and Nutrition surveys which are representative for population in Korea we try to examine the impacts of law change on current smoker and cigarettes smoked per day. The amended law impacted the whole country at the same time and there was a declining trend in smoking rate even before the legislation update. So, the challenge here is to tease out the true impact only. We compare indoor working occupations which are constrained by the law change with outdoor working occupations which are less impacted. Since the data has been collected before (2001) and after (2005) the law change for treated (indoor working occupations) and control (outdoor working occupations) groups we will use difference in difference method. We restrict our sample to working age (between 20 and 65) since these are the relevant population by the workplace smoking ban policy. We also restrict the sample to indoor occupations (executive or administrative and administrative support) and outdoor occupations (sales and low skilled worker) after dropping unemployed and someone working for military since it is not clear whether these occupations are treated group or control group. This classification was supported when we examined the answers for workplace smoking ban policy existing only in 2005 survey. Sixty eight percent of indoor occupations reported having an office smoking ban policy compared to forty percent of outdoor occupation answering workplace smoking ban policy. The estimated impacts on current smoker are 4.1 percentage point decline and cigarettes per day show statistically significant decline of 2.5 cigarettes per day. Taking into account consumption of average sixteen cigarettes per day among smokers it is sixteen percent decline in smoking rate which is substantial. We tested robustness using the same sample across two surveys and also using tobit model. Our results are robust against both concerns. It is possible that our measure of treated and control group have measurement error which will lead to attenuation bias. However, we are finding statistically significant impacts which might be a lower bound of the true estimates. The magnitude of our finding is not much different from previous finding of significant impacts. For cigarettes per day previous estimates varied from 1.37 to 3.9 and for current smoker it showed between 1%p and 7.8%p.