Abstract In view of the increasing tendency to make use of second-hand items, we present a schematic framework that models the possible reuse of an item considering its defective condition, based on the delay time concept. A parallel between the traditional delay time model for single-component systems and the proposed model for the reuse of items is provided in order to emphasize our contribution. In general terms, our model may be applied to any component that wears out over time and that may be replaced by a new one or by a refurbished item. The results show reductions in the order of 36.7 % in the expected cost over an inspection cycle. Also, results indicate that the higher the level of reused items, the lower the expected cost, which suggests the reuse of items can serve not only to generate less severe environmental impacts but also to generate economic benefits. Finally, the main contribution of this paper is an inspection policy that encompasses the level of reused items, in a way that links the condition of the item with savings made by recycling it. The findings presented here reinforce the need to use recycled items, since apart from this leading to greater sustainability in the use of natural resources, some conditions may well result in cost savings.

中文翻译：

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基于延迟时间建模的二手物品使用

摘要 鉴于使用二手物品的趋势越来越大，我们提出了一个示意图框架，该框架基于延迟时间概念，对考虑其缺陷条件的物品的可能再利用进行建模。提供了用于单组件系统的传统延迟时间模型与用于项目重用的建议模型之间的并行，以强调我们的贡献。一般而言，我们的模型可应用于任何随时间磨损且可能被新部件或翻新部件替换的部件。结果表明，在一个检查周期内，预期成本降低了 36.7%。此外，结果表明重复使用的物品水平越高，预期成本越低，这表明物品的再利用不仅可以减少严重的环境影响，还可以产生经济效益。最后，本文的主要贡献是包含再利用物品水平的检查政策，以将物品状况与回收利用所节省的费用联系起来。这里提出的研究结果强调了使用回收物品的必要性，因为除了这会导致自然资源使用的更大可持续性之外，某些条件很可能会导致成本节约。