• Journal of the Korean Institute of Telematics and Electronics A
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• v.28A no.10
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• pp.774-781
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• 1991

A communication network protocol among programable devices built-i manufacturing field, MAP (Manufacturing Automation Protocol), has to provide the job transfer service carrying out a lot of jobs distributively, and the MMS( manufacturing message specification) defines the above application layer protocol. In this paper user software required in job transfer was implemented. So as to provide each service with compatibility and extension, each module was designed according to the functions. A method is selected in double-assigning their domain and program applicable even in complex process, which loads and proceeds several programs sequentially. In order to confirm the logical validity of the designed protocol, local applying test is accomplished for the application layer of response station. Modelling the job flow process, each serice module is verified with the I/O primitives.

• Journal of Korean Institute of Industrial Engineers
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• v.9 no.1
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• pp.23-31
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• 1983

A group scheduling problem, which is production scheduling problem associated with the concept of group technology, is studied under due date constraints in multi-stage manufacturing systems. The purpose of this paper is to develop and evaluate a practical heuristic procedure for determining group sequence and job sequence within each group to minimize total tardiness in multi-stage manufacturing systems. A heuristic algorithm has been developed by introducing the concept of relative measures of job tardiness and group tardiness for job sequencing and group sequencing, respectively. A numerical example is shown to illustrate the proposed procedure. The heuristic algoirthm is tested by comparisons with problems with known optimal solutions and also with random group schedules for a set of large-size problems. Results indicate that the proposed heuristic algorithm provides good solutions with small computational requirements, and thus is viable for large size problems in practice.

• Korean Journal of Occupational Health Nursing
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• v.9 no.2
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• pp.110-120
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• 2000

The purpose of this study was to examine which factors affected the job stress of workers in the manufacturing industry. The subjects were 128 workers in automobile component manufacturing companies located in Kyonggi-do province. Data were collected through self-reporting technique for 8 days, October 24-31, 2000. The instrument to test the work related truss was NIOSH's Work-related Stress Inventory revised by Korea Occupational Safety and Health Association(KOSHA) in 1999. The collected data were analysed with SAS. and frequency, percentage, mean value, standard deviation, t-test, ANOVA. Scheffe's post hoc test and Pearson's Correlation Coefficients. The major findings were as follows: 1. Mean job stress score for the job-related stress was $2.6{\pm}0.5$ on the basis of 5.0 points. Job stress was significantly different according to gender. The stress by role conflict showed higher score than the stress by role ambiguity. 2. Discretionary power(freedom to determine) of workers was scored $2.6{\pm}0.7$ on the basis of 5.0 points. And it was significantly different according to gender, duration of work and shift experience. 3. The work environment scored $2.2{\pm}0.3$ on the basis of 3.0 points and significant difference according to gender, age, marital status, type of employment, type of service, and shift work. 4. Role ambiguity showed significant negatively correlate with job control(r=-.32, P=.000) and decision making(r=-.31, P=.000). And decision making showed positively correlated with job control(r=.62, P=.000), and role conflict(r=.26, P=.003).

• Journal of the Korea Academia-Industrial cooperation Society
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• v.4 no.3
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• pp.121-125
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• 2003

A switch box is metal box for electric wire pipes in building. In manufacturing this box, the first press is used to mold and the second to fifth presses are used to process four-sides of a box. So four presses, four molds and four workers are needed. This leads to raise the manufacturing cost including machine lease rent, molding fee, and wages. To make matters worse, the roaring sound, vibration, and dangers of safety accidents make employees avoid from working that job. To solve this problem, a new Handling Mechanism and a cam die which combined four-die-involving processes into one die process were developed. That results job automation of the Job with one press and one die. The job avoidance problem is solved and manufacturing cost is reduced as well.

• Journal of the Korea Safety Management & Science
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• v.17 no.4
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• pp.353-363
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• 2015

In unlimited competitive period changed every time, domestic manufacturing industry feels a crisis between China and Japan, who are leaping to manufacturing strong countries with worldwide manufacturing factories. In this situation, many companies make an effort to learn and introduce Toyota production method drawing innovation of production method and reduction of many costs for high quality, but most of cases were failed. The reason for the failure should be that correct understanding and application of TPS corporate culture were insufficient and job attitude was not considered when applying Toyota production system. Therefore, the purposes of this thesis are to arrange major contents based on relative documents of precedent researchers, conduct a survey for employees of middle and small scaled manufacturers who introduced Toyota production system, analyze changes of enterprises' job attitude by introduction of TPS corporate culture and the effects on company's management results through the various analyses for grasping relationship among TPS corporate culture, job attitude and management results, introduce Toyota production system more effectively and suggest measures to maximize company's long-term management results.

• Journal of the Korea Safety Management & Science
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• v.23 no.3
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• pp.47-55
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• 2021

Developed countries that have experienced decline in productivity due to the economic crisis in the past have come to recognize the smart factory as an important means to strengthen the competitiveness of the manufacturing industry due to the increase in labor costs, the avoidance of the manufacturing industry, and the resolution of the shortage of skilled manpower. The necessity of nurturing manpower for self-maintenance was felt through identifying factors for successful smart factory introduction by companies and providing smart factory education. Therefore, the effects of educational satisfaction and operational competency on self-efficacy as a parameter and self-efficacy as a parameter were analyzed using research models and hypotheses to determine whether there was an effect between job satisfaction as a dependent variable. As a result of the analysis, it was found that the mediating effect of self-efficacy and self-efficacy on job satisfaction was found to have significant effects on operational competency and self-efficacy as parameters, as well as educational satisfaction and operational competency. The implication of this study is that continuous education and innovation activities are important in order to increase the business performance of companies, and through this, the manufacturing competitiveness of SMEs can be improved.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.5
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• pp.216-224
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• 2018

The purpose of this study was to measure the depressive symptoms and to determine their relationship with job stress content and social support of manufacturing male workers. A total of 428 male workers were surveyed from July 1 to August 31, 2017 using self-administered questionnaires. For the results, the rate of the depression group was 25.1%. In terms of the CES-D scores by job stress contents, CES-D scores were higher in the high job demand group than in the low group and higher in the low job control group than in the high group. In terms of CES-D scores by social support, CES-D scores were higher in the low supervisor support and coworker support group than in the high group. CES-D scores showed a significant positive correlation with job demand but a negative correlation with job control, supervisor support, and coworker support. In terms of hierarchical multiple regression analysis, higher job demand was associated with lower job control, and lower support of supervisors and coworkers gave high depression scores. Explanatory power for depression score significantly increased by 18.4% according to job demand and added job controls. Explanatory power increased by 14.1% with the support of supervisors and coworkers. The above results suggest that the level of depressive symptoms is highly correlated with job demand, job control, and support of supervisors and coworkers.

• Journal of the Korea Safety Management & Science
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• v.13 no.4
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• pp.35-41
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• 2011

This paper reviewed the relationship between job quality, job satisfaction and occupational injuries, and the mediating effect of job satisfaction. Based on the responses from 278 employees in manufacturing sector, the results of multiple regression analysis showed that all job quality factors(job variety, autonomy, job importance, feedback) have positive relationship with job satisfaction and job satisfaction has negative relationship with number of injuries. Also, job satisfaction was found to mediates the relationship between all job quality factors and occupational injuries.

• Research in Community and Public Health Nursing
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• v.10 no.2
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• pp.387-399
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• 1999

The purpose of this study is to identify the relationships of job stressor. coping strategies. and stress responses of manufactoring workers. Data were collected through self-reported questionnaires from 262 of the manufacturing workers in a local electronic company from July to August. 1999. For data analysis. Cronbach's a. Factor Analysis. Descriptive statistics. ANOVA. and Pearson's correlation coefficient with SPSS/PC+ 7.5 version program were used. The results were as follows: 1. Regard to the stress responses and coping strategies by sociodemographic variables. 'the overall stress responses' showed significant differences by sex. age. marrital state. The use of 'control coping strategy' showed significant differences by sex and the type of work. The use of 'avoid coping strategy' showed significant differences by sex. age. married state. year of career. and income. 2. The average scores of 'the job characteristics and participation in decision making factor'. 'the physical environmental factor'. and 'the role and leadership factor' were 2.66. 2.59. 2.59 in order. The average scores for 'the avoid coping strategy' and 'the control coping strategy' were 3.03. 2.97. The average scores for 'the overall. psychosoical. and physical stress responses' were 2.18. 2.18. 2.23. 3. The 'control coping strategy' was negatively related to 'the job characteristics and participation in decision making factor'. 'the role and leadership factor'. 'the psychosocial stress responses'. and 'the overall responses'. 'The control coping strategy' was positively related to all of 'the job stressors'. 'the physical stress responses', and' the overall stress responses'. 'The physical environment factor' was positively related to all of 'the stress reponses'. 'the role and leadership factor'. and 'the job characteristics and participation in decision making factor'. According to the results of this study, the suggestions were as follows: 1. The coping strategies of manufacturing workers in the specific job stress situation should be considered to future studies. 2. In order to applying the stress management program in the workplace. The organizational intervention focused on 'the job characteristics and participation in decision making' will be needed. 3. To support and use of 'control coping strategy' of the workers. the organizational efforts should be required.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.43 no.3
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• pp.10-20
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• 2020

This paper presents a method to measure the similarity of assigned jobs in the gravure printing operation based on the chromaticity and color sequence, and order the jobs accordingly. The proposed dispatching rule can be used to fulfill diverse manufacturing site requirements because the parameters can be adjusted to prioritize chromaticity and color sequence. In general, dispatching rules either ignore the job-changing time or require that the time be clearly defined. However, in the gravure printing operation targeted in this study, it is difficult to apply the general dispatching rule because of the difficulties in quantifying the job-changing time. Therefore, we propose a method for generalizing assignment rules of the job planner, allocating relative similarity among assigned jobs, and determining the sequence of jobs accordingly. Chromaticity priority is determined by the arrangement of the color assignments in the printing operation; color sequence priority is determined by the addition, deletion, or change in a specific color sequence. Finally, the job similarity is determined by the dot product of the chromaticity and color sequence priorities. Implementation of the proposed dispatching rule at an actual manufacturing site showed the planner present the same job order as that obtained using the proposed rule. Therefore, this rule is expected to be useful in industrial sites where clear quantification of the job-changing time is not possible.