• Journal of Korean Society of Occupational and Environmental Hygiene
• /
• v.23 no.1
• /
• pp.27-34
• /
• 2013

Objectives: The purpose of this study is to calculate the worker-DNEL (Derived No Effect Level) values using the REACH guidance and compare the calculated DNELs with existing Korea occupational exposure limits (KOELs) for evaluation of the applicability of the worker-DNELs as provisional occupational exposure limits for chemicals that are not established KOELs in the workplace. Methods: The worker-DNELs for 46 chemicals among 113 hazardous substance requiring management were calculated using the REACH guidance, and a paired t-test was performed to see if there is any statistical difference between two lists (worker-DNELs vs KOELs). The ratios of KOELs over worker-DNELs were also calculated to compare the overall levels of two lists using the geometric means method. Results: The calculated worker-DNELs for 46 chemicals ranged from 0.001 to $329mg/m^3$ (GM= 6.9, GSD = 10.8), and appeared to be a significant difference between the worker-DNELs and the KOELs (p < 0.01). In addition, the ratios of KOELs over worker-DNELs ranged from 0.3 to 394 times (GM = 10.2, GSD = 3.9), indicating that the worker-DNELs were, on average, 27 times lower than the KOELs. Conclusions: Therefore, the study results show that the calculated worker-DNELs can be applied and used as provisional occupational exposure limits in the workplace in order to reduce worker exposures to chemicals and health risks, and manage potential worker exposures based on the precautionary principle through comprehensive chemical risk assessment.

• Journal of Biosystems Engineering
• /
• v.38 no.1
• /
• pp.33-40
• /
• 2013

Purpose: The goal of this study was to build an accurate digital factory that evaluates the performance of a factory using computer simulation. To achieve this goal, we evaluated the effect of worker-related variables on production in a simulation model using comparative analysis of two cases. Methods: The overall work process and worker-related variables were determined and used to build a simulation model. Siemens PLM Software's Plant Simulation was used to build a simulation model. Also, two simulation models were built, where the only difference was the use of the worker-related variable, and the total daily production analyzed and compared in terms of the individual process. Additionally, worker efficiency was evaluated based on worker analysis. Results: When the daily production of the two models were compared, a 0.16% error rate was observed for the model where the worker-related variables were applied and error rate was approximately 5.35% for the model where the worker-related variables were not applied. In addition, the production in the individual processes showed lower error rate in the model that included the worker-related variables than the model where the worker-related variables were not used. Also, among the total of 22 workers, only three workers satisfied the IFRS (International Financial Reporting Standards) suggested worker capacity rate (90%). Conclusions: In the daily total production and individual process production, the model that included the worker-related variables produced results that were closer to the real production values. This result indicates the importance of worker elements as input variables, in regards to building accurate simulation models. Also, as suggested in this study, the model that included the worker-related variables can be utilized to analyze in more detail actual production. The results from this study are expected to be utilized to improve the work process and worker efficiency.

• Journal of the Korean Dietetic Association
• /
• v.3 no.1
• /
• pp.63-73
• /
• 1997

This study was conducted to evaluate the industry foodservice management practices and to suggest guidelines for the effective foodservice management. The survey for the analysis was conducted through the questionnaires to dietitians. They were divided into two groups : the site color worker and the blue color worker. The questionnaires were received for a response rate of 73.2%. Statistical data analysis was completed using the SAS programs for descriptive analysis, $x^2$ test, T-test, F-test, and Fisher's LSD. The results of the study can be summarized as follows : 1) The level of education of dietitians and food cost in the employee feeding operations for the blue color worker was lower than the employee feeding operations for the white color worker. 2) The labor productivity indices were not significantly different according to types of workers. But in the employee feeding operations for the blue color worker, full-time foodservice employees worked more than 10.7 hour per week than their counterpart. This indicates the full-time foodservice employees in the employee feeding operations for the blue color worker performed more loaded work compared to the employee feeding operations for the white color worker. 3) Equipped rate of facilities in the employee feeding operations for the blue color worker was low especially in the food preparation and cooking processes.

• Journal of Environmental Health Sciences
• /
• v.37 no.5
• /
• pp.342-347
• /
• 2011

Healthy worker effect (HWE) refers to the consistent tendency for actively employed individuals to have a more favorable mortality experience than the population at large. Although HWE has been well known since the 1970s, only a few studies in occupational epidemiology have attempted to fully define and evaluate HWE. HWE can be separated into effects on the initial hiring into the workforce (healthy worker hire effect) and those on continuing employment (healthy worker survival effect). In this review, we summarize the methods for minimizingor adjusting for the healthy worker effect available in occupational epidemiology. It is noteworthy that healthy worker survival effect appears complicated, considering that employment status plays simultaneous roles as a counfounding variable and intermediate variable, whereas healthy worker hire effect may be adjusted by incorporating health status at baseline into the statistical model. In addition, two retrospective cohort studies for workers in the semiconductor industry and Vietnam veterans in Korea, respectively, were introduced, and their results were explained in terms of healthy worker effect.

• Korean Journal of Social Welfare
• /
• v.58 no.1
• /
• pp.209-235
• /
• 2006

This study was performed to analysis the social worker's duty in korea and suggest for typology duties of 1st grade social worker, 2nd or 3th grade social worker's qualification. 911 social workers responded to questioner. This objectives was accomplished by the measuring to frequency of duties, and the qualifying cognition of each grade social worker's duties. As a result, social worker spent more time carried out maintenance of facility, direct services, intake, management of file and official document duties than personal management, planning and financial program, evaluation and termination duties. Type of social worker's duties fined out composed of 4 type. Type I(The 1st grade social worker's duties) was belonged to 53 task elements, type IV(The 2nd or 3rd grade social worker's duties) was subjected to 11 task elements. 21 task elements performed to either 1st grade social worker or 2nd, 3rd grade social worker by type or uniqueness of social work practices. To allocation of duties by each grade social worker, fitting out of qualification system, the task elements for each grade of social worker must be prescribed by the rules. This allocation of duties by each grade social worker would be utilized to support qualified social work services, and to strengthening of their professional.

• Proceedings of the Korean Nuclear Society Conference
• /
• 1998.05b
• /
• pp.577-582
• /
• 1998

In nuclear power plant, it has been the important object to reduce the occupational radiation exposure (ORE). Recently, the optimization concept of management science has been studied to reduce the ORE in nuclear power plant. In optimization of the worker allocation, the collective dose, working time, individual dose, an total number of worker must be considered and their priority orders must be thought because the main constraint is necessary for determining the constraints variable of the radiological worker allocation problem. The ultimate object of this study s to look into the change of the optimal allocation of the radiological worker as priority order changes. In this study, the priority order is the characteristic of goal programming that is a kind of multi-objective linear programming. From a result of study using goal programming, the total number of worker and collective dose of worker have changed as the priority order has changed and the collective dose limit have played an important role in reducing the ORE.

• Journal of the Korean Home Economics Association
• /
• v.39 no.3
• /
• pp.47-66
• /
• 2001

The purpose of this study is to find the difference of household/work characteristics, family life satisfaction, and work satisfaction between home-based workers and out-of-home workers. The data of this study was collected from 230 married womens(home-based worker : 103 cases out-of-home worker : 127 cases) living in seoul. The major findings of the study are as follows. 1) Home-based worker's consumption expenditure structure, wive's housework time, schedule flexibility and degree of interruption, work loads were significantly higher than out-of-home workers. 2) Home-based worker's average monthly wage of her own and work time were significantly lower than out-of-home jokers. 3) Home-based worker's child care satisfaction and time use satisfaction were significantly higher than out-of-home workers. Out-of-home worker's self-fulfillment satisfaction, satisfaction of relation with supervisor, job stability satisfaction, work time satisfaction was significantly higher than home-based workers.

• Korean Journal of Social Welfare
• /
• v.58 no.2
• /
• pp.355-375
• /
• 2006

The objective of this study examined the effect of job characteristics on the job satisfaction of social worker employed by 1st social agency, hospitals. Data were collected by 240 social workers. Based on Hackman and Oldham's(1975) theory of core job characteristics, this study was to defined other element of job characteristics, in social worker's duties, focused on moderating effect of self-confidence for job satisfaction, and compared to social worker's job characteristics between 1st social agency and hospitals. The results of this study were summarized as follows; first, job autonomy, feedback among Hackman and Oldham's 5 core job characteristics showed positive influence on job satisfaction. The other job characteristics found out significantly effected social worker's job satisfaction than Hackman and Oldham's 5 core job characteristics. Second, identities of social worker's job, cognition of professional level, necessity, and self-confidence variables were found to have a statistically significant strong relationship with job satisfaction of 1st setting social worker. The other side, necessity, self-confidence, sex, social worker's academic career variables positive influenced medical social worker's job satisfaction. Third, the moderating variables which had significant difference among social worker's working conditions. 1st setting social worker's self-confidence partial moderated the effect of job characteristics on social worker's job satisfaction. But, medical social worker's self-confidence not moderated the effect of job characteristics on job satisfaction. As a result, Social worker's job satisfaction depended on job characteristics and self-confidence. Therefore, to assure the job satisfaction, redesign for social worker's job characteristics, reinforced their self-confidence. Staff-development education program, supportive environment, supervision program is strongly recommended.

• Journal of the Korea Society of Computer and Information
• /
• v.23 no.7
• /
• pp.113-120
• /
• 2018

The purpose of this study is to derive implications for effective management of the public social worker by investigating the relationship between social support, job attitude and self-esteem of the public social worker. In order to accomplish this research purpose, social support of the public social worker as independent variables, job attitude as a dependent variable, and self-esteem as a parameter were analyzed and the relationship between these variables was analyzed. As a result, emotional, evaluative, material, and informational support, which constitute the social support of the public social worker, have a significant effect on job attitude, and self-esteem has a mediating effect on the relationship between these variables. Based on the results of this analysis, the importance of social support of the public social worker was suggested.

• Korean Journal of Social Welfare
• /
• v.46
• /
• pp.377-403
• /
• 2001

The purpose of this study is to measure the social worker's knowledge about facts on aging and attitude toward the elderly between Korea and Japan. and to find out the variables that may influence their attitude. Four hundred and sixty two social workers working in nursing homes were given the questionnaire containing the Kyung San Facts on Aging Quiz to measure the level of knowledge about aging and Yoon (1988)'s scale to find the direction of attitude toward the elderly. The results of this study are analyzed as follows: (1) The Korean social worker's level of knowledge about aging was 63.0%, which was lower than Japanese social worker's level (67.6%). (2) Using 5 points scale. mean of the Korean social worker's attitude toward the elderly was 2.2 (44.8%), which was significantly different from the Japanese social worker's attitude 3.2 (63.4%). (3) Using multiple regression analysis, the social worker's level of knowledge about aging was the most significant predictor to explain the social worker's attitude toward the elderly. The other variables that are also statistically significant predictors of the social workers' attitude were country, personal experience with the elderly. and voluntary experience for the elderly. Especially the significant predictors to explain the Korean social workers' attitude were their levels of knowledge about aging. age, and classification of social worker license. On the other hand. the significant predictors to explain the Japanese social workers' attitude were their levels of knowledge about aging and periods of activity, Based on the research results, implications for practice and education methods for making social workers' attitude toward the elderly more positive are also suggested.