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Buffer sizing approach with dependence assumption between activities in critical chain scheduling

机译：关键链调度中活动之间具有依赖假设的缓冲区大小确定方法

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The critical chain/buffer management (CC/BM) methodology, proposed by E.M. Goldratt [1997. Critical chain. New York: The North River Press], introduced the concept of buffers to protect the critical chain against the disruptions. The buffer sizes reflect the uncertainty in the estimation of project duration and affect the project scheduling performance. However, the most current buffer sizing approaches make the assumption that project activity durations are independent. In this paper, the effects of the dependence between activities on project duration performances are analysed, a method for determining buffer sizes with dependence assumption between activities is introduced. Specifically, two definitions reflecting dependence, which are the dependence degree and the dependence factor, are integrated into the formulation of buffer sizing approach. The suggested method is tested and compared with the methods with independence assumption, the root square error method, the adaptive procedure with resource tightness and the adaptive procedure with density. The results indicate that the methods with independence assumption may underestimate the buffer size when at least one of the two definitions is at a high level, while the suggested method can provide better protection in such circumstances.
机译：关键链/缓冲区管理（CC / BM）方法，由E.M. Goldratt提出[1997。关键链。纽约：北河出版社]引入了缓冲的概念，以保护关键链免受破坏。缓冲区大小反映了项目工期估计中的不确定性，并影响项目进度性能。但是，最新的缓冲区大小确定方法假设项目活动的持续时间是独立的。本文分析了活动之间的依赖关系对项目工期绩效的影响，介绍了一种基于活动之间的依赖假设确定缓冲区大小的方法。具体地，将反映依赖性的两个定义，即依赖性程度和依赖性因子，整合到缓冲器大小确定方法的公式中。对所提出的方法进行了测试，并与独立假设方法，均方根方法，资源紧张的自适应方法和密度的自适应方法进行了比较。结果表明，当两个定义中的至少一个处于较高级别时，具有独立性假设的方法可能会低估缓冲区大小，而建议的方法可以在这种情况下提供更好的保护。

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