• 대한예방의학회:학술대회논문집
• /
• 2001.10a
• /
• pp.258-259
• /
• 2001

• 대한예방의학회:학술대회논문집
• /
• 2005.10a
• /
• pp.353-353
• /
• 2005

• 대한예방의학회:학술대회논문집
• /
• 1993.10a
• /
• pp.139-140
• /
• 1993

• The Korea Swine Journal
• /
• v.18 no.6 s.202
• /
• pp.74-75
• /
• 1996

사전예방 및 오염자 부담원칙을 정립하여야 한다. 환경파괴는 쉽지만 복구는 정말 어려우므로 사회문화생활과 경제활동 등 모든 분야에서 환경안전이 최대한 고려되어야 한다. 이를 위하여 환경위해요소에 대한 빈틈없는 사전예방체제를 확립하는 것이 필수적이다. 그리고 사전예방의 실효성을 높이기 위해서 원인자가 오염제거와 복구의 비용을 부담하는 원칙을 철저히 지켜나가야 한다.

• 대한예방의학회:학술대회논문집
• /
• 2005.10a
• /
• pp.352-352
• /
• 2005

• 대한예방의학회:학술대회논문집
• /
• 2000.10a
• /
• pp.189-192
• /
• 2000

• 대한예방의학회:학술대회논문집
• /
• 1998.10b
• /
• pp.163-164
• /
• 1998

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.2
• /
• pp.1-7
• /
• 2016

Although the second driving device of KTX, which consists of the wheel and the axle reduction gears unit, is a mechanically integrated structure, its preventive maintenance (PM) requires two separate intervals due to the different technical requirements. In particular, these subsystems perform attaching and detaching work simultaneously according to the maintenance directive. Therefore, to reduce the unnecessary amount of PM and high logistic availability of the train, it is important to optimize PM with regard to reliability-centered maintenance toward a cost-effective solution. In this study, fault tree analysis and reliability of the subsystems, considering the criticality of the components, were performed using the data derived from field data in maintenance. The cost optimization of the PM was derived from a genetic algorithm considering the target reliability and improvement factor. The cost optimization was derived from a maximum of the fitness function of the individual in generation. The optimal TBO of them using the genetic algorithm was 2.85x106 km, which is reduced to approximately 21% compared to the conventional method.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.1
• /
• pp.274-283
• /
• 2016

The study of maintenance planning is important in military weapon systems because it can improve their availability and reduce the operational and maintenance cost during the total life cycle. In maintenance planning, it is important to determine the preventive maintenance task and its optimal interval. This paper focuses on the hard time task, which is one of the preventive maintenance tasks. A hard time task removes an item or restorative action before some specified maximum age limit to prevent functional failure. The Monte-Carlo simulation model was proposed to help understand the cost effectiveness of a hard time task. In the simulation, various shape parameters of the Weibull distribution and cost ratio of corrective maintenance to preventive maintenance were assumed. Using a Monte-Carlo simulation, a quantified cost saving effect and optimal preventive maintenance interval were suggested.

• Journal of the Korean Society of Hazard Mitigation
• /
• v.9 no.4
• /
• pp.45-51
• /
• 2009

The paper presents the economic analysis of optimized-rehabilitation area method considered as one of the preventive maintenance methods in asphalt concrete pavement. The optimized-rehabilitation area was selected based on the analysis of traffic lane characteristics. The main concept of the selected method was to minimize the maintenance cost. The effective width of traffic lane in this method was 70 cm of each wheel path. According to the traffic survey conducted in this research, more than 95% of vehicles passed within the width of each wheel path. The new preventive optimized-rehabilitation area method showed less maintenance cost than the conventional overlay. In addition, traffic congestions and the user cost can be reduced. The research results revealed that the total maintenance cost was reduced by 35% by using the new method compare to the conventional one.