基于质量损失的过程网络及其关键质量链分析

针对传统的过程能力分析仅以生产线中某一单一的生产工序(过程)为对象这一问题,将影响产品质量的所有生产过程视为一个过程网络,根据Taguchi田口方法,阐述了过程能力指数与质量损失的关系,给出了生产制造过程网络过程能力指数的计算方法.进一步应用PERT/CPM的基本思想,建立了生产制造过程网络关键质量链的规划模型,将质量损失最大的路径视为关键质量链.通过实例分析表明,以上方法改进了传统的统计质量控制和分析方法,能够有效地实现过程网络的质量管理.     

偏序集最小顶点割算法与最小费用赶工问题

在网络计划问题中,一项大的工程由许多工序合成。工序与工序之间存在着一定的前后关系,每个工序有着自己的正常加工时间和通过赶工所能达到的最短加工时间以及每赶工一天的赶工费用。设一项工程的正常工期为T天,通过对所有可能的工序赶工,整个工程能达到的最短工期为S天。本文的问题是,对于任意给定的t(S t相似文献   

Computing latest starting times of activities in interval-valued networks with minimal time lags

This paper deals with problems of determining possible values of earliest and latest starting times of an activity in networks with minimal time lags and imprecise durations that are represented by means of interval or fuzzy numbers. Although minimal time lags are practical in different projects, former researchers have not considered these problems.After proposing propositions which reduce the search space, a novel polynomial algorithm is presented to compute intervals of possible values of latest starting times in interval-valued networks with minimal time lags. Then, the results are extended to networks with fuzzy durations.