• International Journal of Reliability and Applications
• /
• v.3 no.2
• /
• pp.61-80
• /
• 2002

Tree-harvesting worker data of 508 separate worker accidents are analyzed and an exploratory approach taken. The worker accident data cover a sample of five years. The scope of the study was the southeastern United States of America. As might be hypothesized, the chainsaw was the most hazardous type of tree-harvesting equipment. It accounted for 55％ of the tree-harvesting accidents. Most chainsaw accidents resulted in injuries to the lower extremities and were more frequent among younger employees. The probability of one or more chainsaw accidents occurring in any 30-day period was approximately 0.856. Chainsaw accidents were more likely to occur in late morning and early afternoon. We used statistical tools such as Pareto charts, c-charts and Ishikawa diagrams. Such tools are useful in diagnosing the root-cause of tree-harvesting worker accidents and help in developing preventive safety programs. Recommendations to help improve the quality of information of accident data collected by insurance companies and others are briefly given. The strategy and culture of continuous process improvements are stressed.

• International Journal of Internet, Broadcasting and Communication
• /
• v.12 no.3
• /
• pp.171-176
• /
• 2020

This paper presents an implementation of a gesture recognition platform that can be used in a factory workplaces. The platform consists of signages that display worker's job orders and a control center that is used to manage work orders for factory workers. Each worker does not need to bring work order documents and can browse the assigned work orders on the signage at his/her workplace. The contents of signage can be controlled by worker's hand and arm gestures. Gestures are extracted from body movement tracked by 3D depth camera and converted to the commandsthat control displayed content of the signage. Using the control center, the factory manager can assign tasks to each worker, upload work order documents to the system, and see each worker's progress. The implementation has been applied experimentally to a machining factory workplace. This flatform provides convenience for factory workers when they are working at workplaces, improves security of techincal documents, but can also be used to build smart factories.

• Journal of the Korea Society of Computer and Information
• /
• v.23 no.6
• /
• pp.67-73
• /
• 2018

The purpose of this study is to investigate the relationship between interpersonal stress and job burnout, turnover intention of social welfare worker's in social welfare center and efficient response of welfare worker's. In order to accomplish this study purpose, the interpersonal stress of social welfare worker's in social welfare center as an independent variable, interpersonal stress as a dependent variable of job burnout and turnover intention, and stress coping ability as a moderating variable were selected. The causal relationship between interpersonal stress and job burnout, turnover intention and the moderating effect of stress coping ability were analyzed. As a result of the analysis, the interpersonal stress of social welfare worker's showed a significant effect on job burnout and turnover intention. Also, moderating effects of stress copying ability were significant. Based on the results of this analysis, the theoretical implications and policy implications of this study are suggested, and the directions and limitations of this study are suggested.

• 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.

• The Journal of the Korea Contents Association
• /
• v.20 no.11
• /
• pp.237-248
• /
• 2020

This study investigates the effect of work environment-in terms of job demands and job resources-on worker job engagement and burnout based on the JD-R model. The aim is to provide preliminary data to formulate policy and practical measures to strengthen job engagement and prevent burnout of workers at a community children's center. To this end, a self-administered questionnaire was answered by 447 workers at such a center in the city of Daejeon, Korea, and the results were analyzed using SPSS 23.0 and AMOS 23.0. The research model had a statistically acceptable fit, with CFI = .900, TLI = .887, and RMSEA = .077. The following correlations were found among the key variables: i) a greater perceived amount of job resources led to a stronger worker job engagement but did not directly influence worker burnout; ii) more perceived job demands caused a higher worker burnout but did not directly influence worker job engagement; and iii) the greater the worker job engagement, the less burned out the workers were. These conclusions contribute to understanding the effect of the work environment on worker job engagement and burnout based on the JD-R model. We emphasize the need to improve this environment in community children's centers with supportive policy and practical measures to enhance worker job engagement and reduce burnout.

• Journal of Korean Society of Forest Science
• /
• v.105 no.4
• /
• pp.441-448
• /
• 2016

The purpose of this study was to broaden our knowledge on the productivity and costs of felling operation in three different harvesting methods(whole tree, tree-length and cut-to-length). Felling was conducted in three different harvesting methods with two workers who have different work experiences. Worker A and B have had felling experiences for about 5 years and 15 years, respectively. Felling productivity in whole tree method was $10.3m^3/SMH$ for worker A and $12.7m^3/SMH$ for worker B. Felling costs for worker A and B were $2,066won/m^3$ and $2,201won/m^3$, respectively. Although felling productivity of worker B in whole tree method was higher than worker A, felling costs of worker A were similar to worker B because the wage of worker B was more expensive than the wage of worker A (p>0.05). In tree-length method, felling cost of worker B were cheaper than that of worker A. Felling productivity and cost in tree-length method were $2.2m^3/SMH$ and $9,890won/m^3$ for worker A and $3.3m^3/SMH$ and $8,459won/m^3$ for worker B, respectively (p<0.05). In cut-to-length method, felling productivity and cost were $2.3m^3/SMH$ and $9,584won/m^3$ for worker A and $3.0m^3/SMH$ and $9,395won/m^3$ for worker B, respectively. Felling productivity of worker B was higher than that of worker A(p>0.05). Our preliminary results found that harvesting methods and worker's experiences highly affect on the productivity and costs of felling operations. These results should be useful for forest managers when planning cost-effective harvesting operations.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
• /
• v.15 no.4
• /
• pp.318-328
• /
• 2003

Numerical simulation using computational fluid dynamics (CFD) is performed to calculate the velocities and temperature profiles of air in adjacent to a worker within the individual local air conditioning system. The calculation domain is the space of ㄴ between walls and a worker in the climate room. The fresh air is supplied from the three different inlets located on the right, left and center wall in the climate room. In this study, the calculated data of velocities and temperature profiles of air in the nearest the skin of a worker are used to calculate the PMV (Predicted Mean Vote) for evaluation of thermal comfort of a worker in the local air conditioning system. Because the data of veto-cities temperature profiles of air in adjacent to a worker and the PMV of a worker are the design parameters of the local air conditioning system. The results of calculation show that the fresh air velocity and injection position are closely related to the PMV value. In individual air condition system of ㄴ, the appropriate PMV are obtained when the fresh air velocity and position are 1.0 m/s, throat of a worker and are 1.5 m/s, head of a worker, respectively. The method of numerical calculation is effective to obtain the optimum velocity and position of the fresh air for optimum the PMV and energy saving in individual local air conditioning system.

• Journal of The Korea Institute of Healthcare Architecture
• /
• v.17 no.4
• /
• pp.15-23
• /
• 2011

Long-term care Insurance system for the Elderly was started to respond to the aged society on July 2008 in Korea. So responsibility of the care for the old is being changed from the family to the society. The introduction of that insurance system has brought the growth of demand for care service. To improve the level of quality for care service providers in long-term care, the role of care worker in providers is recognized as important. But welfare system for the care worker seems to be poor. So the Seoul Metropolitan Council is preparing an ordinance for the care worker and the purpose of this study is for the ordinance as well. Questionnaires, interviews, documentary surveys were used to carry out this study. The results of this study are summarized as follows. The job stability is the most important thing for the care worker, so local government has to make efforts to promote the job stability of care worker. A welfare center for care workers is needed for the health for care workers in the local government. And the local government has to supervise service providers more strictly and evaluate them in treatments of care worker.

• PNF and Movement
• /
• v.21 no.2
• /
• pp.171-183
• /
• 2023

Purpose: The purpose of this study was to compare universal goniometry (UG), which is commonly used in clinical practice to measure the range of motion (ROM) of finger joints with a wearable soft sensor glove, and to analyze the reliability to determine its usefulness. Methods: Ten healthy adults (6 males, 4 females) participated in this study. The metacarpophalangeal joint (MCP), interphalangeal joint (IP), and proximal interphalangeal joint (PIP) of both hands were measured using UG and Mollisen HAND soft sensor gloves during active flexion, according to the American Society for Hand Therapists' measurement criteria. Measurements were taken in triplicate and averaged. The mean and standard deviation of the two methods were calculated, and the 95% limits of agreement (LOA) of the measurements were calculated using the intraclass correlation coefficient (ICC) and Bland-Altman plot to examine the reliability and discrepancies between the measurements. Results: The results of the mean values of the flexion angles for the active range of motion (AROM) of the finger joints showed large angular differences in the finger joints, except for the MCP of the thumb. In the inter-rater reliability analysis according to the measurement method, the ICC (2, 1) value showed a low level close to 0, and the mean difference by the Bland-Altman plot showed a value greater than 0, showing a pattern of discrepancy. The 95% LOA had a wide range of differences. Conclusion: This study is a preliminary study investigating the usefulness of the soft sensor glove, and the reliability analysis showed a low level of reliability and inconsistency. However, if future studies can overcome the limitations of this study and the technical problems of the soft sensor glove in the development stage, it is suggested that the measurement instrument can show more accurate measurement and higher reliability when measuring ROM with UG.

• Korean Journal of Labor Studies
• /
• v.24 no.2
• /
• pp.137-179
• /
• 2018

To reduce labor market discrimination, there are lively discussions about the role of extant labor regime based on labor unions. It includes both the critical perspective on extant labor movement and the necessity of new actors for resolving discriminations within labor market. Among new actors, the present study focuses on contingent labor centers. Specifically, we have investigated on the development and identity of contingent labor centers as coalition of local government-labor organization. The core content of this study is to reconstruct the activities and strategies of contingent labor centers throughout the longitudinal approach. From many evidences, we can confirm that contingent labor centers have evolved via three phases such as differentiation, de- politicizing, and networks. This finding also provides insights about inside relationships between contingent labor centers and outside tensions between contingent labor center and extant labor organizations. We finally discuss on the theoretical implications of contingent labor center as new actor for contingent worker movement.