• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.1943-1954
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• 2008

The Seoul Metro has been playing a vital role in public transportation for last 35 years as the feet of 10 millions of Seoul citizens. It currently takes charge of over 45% of the national subway transit and transports 4 millions of citizens a day. The purpose of this study is to suggest a plan for crew members' working condition improvement and job satisfaction improvement which will lead to the finest quality of service to the citizens. We examined the working conditions of the crew members and surveyed crew members about the working conditions and the extent of job satisfaction. The results of our study can also be used as basic materials for building the road map to the management improvement.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.14-21
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• 2011

Reliability means that a product maintains its initial quality and performance at certain period of time(time, distance, cycle etc) under given condition without failure. Given conditions include both environmental condition and operating condition. Environmental condition means common natural environment such as temperature, humidity, vibration, and working condition means artificial environment such as voltage, current load, install place, hours of use, which occurs during using the product. In the field of railway vehicles, although components of railway vehicles with reliability are the trend of mandatory as persisting period of railway vehicles is extended, using components of railway vehicles is insufficient for the practical reliability assessment. but the meaning of the first railway operating agnecy to acquire the parts in the field, the data suggest the reliability of products if you can and can show the reliability of modular units and modular units can provide the reliability of if you can present reliability of the entire system is thought to be here. In this study, lifespan of micro-switch for master controller is analyzed and prediction is performed based on its field data considering the special circumstances of railway vehicles operating agency, such as a large number of trains operates on the same line.

• 시스템엔지니어링학술지
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• 제7권1호
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• pp.57-69
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• 2011

Reliability means that a product maintains its initial quality and performance at certain period of time(time, distance, cycle etc) under given condition without failure. Given conditions include both environmental condition and operating condition. Environmental condition means common natural environment such as temperature, humidity, vibration, and working condition means artificial environment such as voltage, current load, install place, hours of use, which occurs during using the product. In the field of railway vehicles, although components of railway vehicles with reliability are the trend of mandatory as persisting period of railway vehicles is extended, using components of railway vehicles is insufficient for the practical reliability assessment. but the meaning of the first railway operating agency to acquire the parts in the field, the data suggest the reliability of products if you can and can show the reliability of modular units and modular units can provide the reliability of if you can present reliability of the entire system is thought to be here In this study, lifespan of micro-switch for master controller is analyzed and prediction is performed based on its field data considering the special circumstances of railway vehicles operating agency, such as a large number of trains operates on the same line.

• 한국산업보건학회지
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• 제11권3호
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• pp.179-189
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• 2001

This study was performed to identify the current status of work environment management and to provide appropriate recommendations for small scale industry with less than 5 workers from September, 2000 to October, 2000 in Seoul city and Gyoung-gi province. The 211 companies were surveyed by checklist included the elements of management of work environment, hazardous chemicals, MSDS, personal protective equipment, and ventilation system. The proportion of metal products manufacturing and printing industries are 25.6 % and 22.3%, respectively. The daily working hours in printing industry is longer than others. The industries that produce potentially hazardous agents, such as noise, dust, metal, organic solvents, radiation and chemical material are pulp, plating, machinery, and printing, respectively. In above industries, only 2.8 % of those recognised and had MSDS. The proportion of companies providing fire extinguishers, safety showers are found to be 13.3 %, 7.1 %, respectively. Only 24.2 % of companies provided personal protective equipment to the workers. The ventilation system was operated in most of companies. But local exhaust ventilation system is provided to 22.3 % of those, also had not been annually inspected. This study showed that the current status of occupational safety and health was not appropriate for workers in small scale industries. It is suggested that annual physical examination have to be performed, MSDS usage must become widespread, and employer and emplyees in small scale industry should be educated for the treatment and storage of hazardous chemicals to improve the occupational safety and health of the working environment. also, regulatory standard has to be applied to local exhaust ventilation system in small scale industry to improve the working condition.

• International Journal of Railway
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• 제5권1호
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• pp.1-9
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• 2012

Reliability means that a product maintains its initial quality and performance at a certain period of time (time, distance, cycle etc) under given condition without failure. The given conditions include both environmental condition and operating condition. Environmental condition means a common natural environment such as temperature, humidity, vibration, and working condition means an artificial environment such as voltage, current load, place for installment, and hours of use, which occurs during the life of the product. In the field of railway vehicles, it is mandatory to use a part with the proved reliability as the extension of the life of vehicle become highly necessary. But the reliable assessment method for the reliability of the part is insufficient. If the reliability of the railway vehicle parts could be assessed by using the field data, the reliability of the entire system could also be evaluated reliably. In this study, life span of micro-switch for master controller is analyzed and prediction is performed based on its field data given by an operator considering the special circumstances of railway vehicles such as the operation of a large number of trains on the same line.

• 대한안전경영과학회지
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• 제26권3호
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• pp.101-106
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• 2024

The health and working conditions of employees have become increasingly important issues in modern society. In recent years, there has been a continuous rise in problems related to the deterioration of workers' alth, which seriously affects their safety and overall quality of life. Although existing research has investigated various factors affecting workers' health and working conditions, there is still a lack of studies that scientifically analyze and identify key variables from the vast number of factors. This study employs the Lasso (Least Absolute Shrinkage and Selection Operator) technique to mathematically analyze the key variables influencing workers' health status and satisfaction with their working environment. Lasso is a technique used in machine learning to identify a small number of variables that impact the dependent variable among a large set of variables, thereby reducing model complexity and improving predictive accuracy. The results of the study can be utilized in efficiently improving workers' health and working environments by focusing on a smaller set of impactful variables.

• 한국직업건강간호학회지
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• 제27권3호
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• pp.171-179
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• 2018

Purpose: The purpose of this study was to examine the mental health and presenteeism of early childhood teachers and to explore the effects of working conditions and job satisfaction on these. Methods: Data from the 4thKorean Work Environment Survey were used. The sample consisted of 474 female early-childhood teachers from private facilities. Mental health was measured using the WHO-Wellbeing Index. Presenteeism was attributed to a participant upon indication that, during the past 12 months, she had ever attended work, despite being sick. The data by complex sample design were analyzed through the Rao-Scott $x^2$ test and logistic regression analysis. Results: 37.9% of early childhood teachers reported poor mental health and 34.2% had experienced presenteeism. Early childhood teachers in permanent employment, who did not work evening shifts, and with sustainable jobs, were more likely to have better mental health. Moreover, those in permanent employment and remunerated appropriately were less likely to experience presenteeism. Conclusion: Type of employment, number of days working in the evening, and job sustainability affect mental health. Further, type of employment, number of workers, and being well paid have an effect on presenteeism. We suggest that improved working conditions should precede the improvement of early-childhood teachers' mental health.

• Composites Research
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• 제26권4호
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• pp.265-272
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• 2013

섬유강화플라스틱(Fiber-reinforced plastic, FRP)은 복합재료 보트를 만드는 데 주 구조물로 사용되고 그것들 대부분은 몰드에서 만들어진다. 이러한 제품들은 몰드에서 분리될 때나 높은 온도의 환경에서 변형이 생긴다. 그러므로 다양한 제작 및 작동 조건에서 적층복합재료 구조물의 변형에 대한 실험적 조사 및 평가는 필수적이다. 불포화 폴리에스테르수지와 유리섬유를 이용하여 L-shape과 Curve-shape 시편을 제작하였다. 경화제 비율과 제작온도, 네 가지 작동온도가 입력인자(독립변수)로 사용되었고 출력인자는 시편에서 측정되는 변형이다. 결과로부터 경화제 비율이 높을수록 또한 제작온도가 높을수록 변형이 작게 생김을 알 수 있었다. 작동온도가 상승할 때 초기 변형 값에 따라 큰 변화를 보였다. 또한 변형 값이나 입력인자들은 회귀 방정식으로부터 예측할 수 있었다.

• 대한디지털의료영상학회논문지
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• 제5권1호
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• pp.138-149
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• 2002

During the period from may to June 2000, a questionnaire study was carried out on 65 male radiological technologist who had been engaged at VDT work, to find out correlation their symptoms to VDT syndrome factors, work environment and condition. The results were as follows : 1. The mean age was 41.0 years, the mean relay working time was 3.75 hours and the mean duration of using computer monitor was 5.9 years, the satisfactory of working was 44.6% the others 55.4%, among these, 3.1% had symptoms before using the VDT and the others had not. 2. The prevalence of symptoms was the highest on wholebody tired, followed by eye, neck, low back, in decreased order and the lowest was fatique of wrist. 3. There was not significant correlation of symptoms to age, but significant to working time, working duration. 4. There was not significant correlation of symptoms to satisfactory. 5. Working desk, monitor, illuminations, temperature, and noise were significantly related to symptoms. 6. There was significant relation of symptoms to CT, MRI workers.

• 한국안전학회지
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• 제20권2호
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• pp.133-139
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• 2005

TWe investigated whether work ability index(WAI) was highly correlated with work environment(physical work environment, working condition and work form) correlated high. The study population consisted of technicians from one manufacturing company in South Korea(n=104). WAI and work environment were analyzed by correlation and multiple regression. Therefore, we conclude that the correlation of WAI and work environment in this population was high. So if there are the older employees having a poor score on the items related to work environment, we can elevate the work ability by dealing with work environment. Moreover, we can make the best program to maintain and raise WAI in short term.