第四阶段是主动维修（proactive maintenance）和维修策略优化阶段，即综合上述三种模式的优点，确定适宜的维 修策略。
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A proactive maintenance based on machine learning approach is defined at first to solve the problems such as knowledge acquisition automatically and help make decision about the fault source and maintenance.
另一方面,通过决策树方法得到的知识模型,辅助故障源的判断,能够在故障发生之前提前预防,达到主动维修的目的。
参考来源 - 基于机器学习的油液分析系统研究·2,447,543篇论文数据，部分数据来源于NoteExpress
保持准确和最新记录的基础设施和附近植被主动维修，可按期风险和责任减少。
By maintaining accurate and up to date records of the infrastructure and nearby vegetation proactive maintenance can be scheduled and the risk and liability reduced.
预防性维修属于一种主动维修，其主要目的是延长设备寿命、延长设备无故障时间、降低设备全寿命费用。
As a kind of initiative maintenance, preventive maintenance mainly aims at prolonging service life of medical equipment, extending their fault-free time and lowering the whole life expense.
在没有当班工程师/总工程师指导的情况下，主动并预见性的着手于预防性维修计划中规定的工作任务。
Use initiative and foresight to undertake tasks outlined within the preventative maintenance program without the direction of the Shift Engineer/Chief Engineer.
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