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161.
Assemble‐to‐order (ATO) is an important operational strategy for manufacturing firms to achieve quick response to customer orders while keeping low finished good inventories. This strategy has been successfully used not only by manufacturers (e.g., Dell, IBM) but also by retailers (e.g., Amazon.com). The evaluation of order‐based performance is known to be an important but difficult task, and the existing literature has been mainly focused on stochastic comparison to obtain performance bounds. In this article, we develop an extremely simple Stein–Chen approximation as well as its error‐bound for order‐based fill rate for a multiproduct multicomponent ATO system with random leadtimes to replenish components. This approximation gives an expression for order‐based fill rate in terms of component‐based fill rates. The approximation has the property that the higher the component replenishment leadtime variability, the smaller the error bound. The result allows an operations manager to analyze the improvement in order‐based fill rates when the base‐stock level for any component changes. Numerical studies demonstrate that the approximation performs well, especially when the demand processes of different components are highly correlated; when the components have high base‐stock levels; or when the component replenishment leadtimes have high variability. © 2012 Wiley Periodicals, Inc. Naval Research Logistics, 2012 相似文献
162.
边防武警执行命令行为的刑法学分析 总被引:2,自引:0,他引:2
基于我国的边防体制,边防武警执行命令的行为在边防管理活动中属行政行为,执行军事命令的行为属军事行为。边防武警执行命令行为性质的不同定位,导致了不同的法律意义。在不同的情况下,边防武警对命令有效性的审查义务在范围和程度上是不同的,由此,在认定犯罪排除事由的构成上也应加以区别。执行命令作为排除犯罪的事由,基于不同的要件,可构成合法化事由或者免责事由。在命令合法有效的时候,执行命令就成为合法化事由。在命令不具有合法有效性的时候,执行命令就不能成为合法化事由,但在一定情况下,执行违法命令可以构成免责事由,从而排除行为的犯罪性。 相似文献
163.
武器系统概率指标的贝叶斯决策评定方法 总被引:1,自引:1,他引:0
剖析了武器系统试验工程领域中常用二项分布经典假设检验方法存在的问题,从贝叶斯决策思想和理论出发提出了概率指标评定的新方法,通过实例对比证明了贝叶斯决策评定方法有效解决了二项分布经典假设检验方法中存在的问题。 相似文献
164.
165.
We consider an EOQ model with multiple suppliers that have random capacities, which leads to uncertain yield in orders. A given order is fully received from a supplier if the order quantity is less than the supplier's capacity; otherwise, the quantity received is equal to the available capacity. The optimal order quantities for the suppliers can be obtained as the unique solution of an implicit set of equations in which the expected unsatisfied order is the same for each supplier. Further characterizations and properties are obtained for the uniform and exponential capacity cases with discussions on the issues related to diversification among suppliers. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2006 相似文献
166.
This article deals with the investigation of the effects of porosity distributions on nonlinear free vibration and transient analysis of porous functionally graded skew (PFGS) plates. The effective material properties of the PFGS plates are obtained from the modified power-law equations in which gradation varies through the thickness of the PFGS plate. A nonlinear finite element (FE) formulation for the overall PFGS plate is derived by adopting first-order shear deformation theory (FSDT) in conjunction with von Karman’s nonlinear strain displacement relations. The governing equations of the PFGS plate are derived using the principle of virtual work. The direct iterative method and Newmark’s integration technique are espoused to solve nonlinear mathematical relations. The influences of the porosity distributions and porosity parameter indices on the nonlinear frequency responses of the PFGS plate for different skew angles are studied in various parameters. The effects of volume fraction grading index and skew angle on the plate’s nonlinear dynamic responses for various porosity distributions are illustrated in detail. 相似文献
167.
非线性自适应统计滤波器在声测量信号处理中的应用 总被引:2,自引:1,他引:1
颜冰 《海军工程大学学报》2000,(5):39-44
从α-stable分布特征出发,阐述了处理非高斯噪声的LMP、顺序统计、群组等非线性统计滤波器自适应算法;实例验算表明了在α-stable分布下,非线性统计自适应器性能优于传统的线性自适应滤波器,且收敛速度更快. 相似文献
168.
综述了四节点等参单元存在的问题,以及提高其精度的途径,并对这些方法略做评述,且探讨了发展高精度单元的方法。 相似文献
169.
为了提高大长径比发动机药柱结构完整性水平,基于三维黏弹性有限元法,计算某大长径比固体发动机在温度和内压荷载联合作用下的结构响应;研究伞盘结构及其位置对药柱最大Von Mises应变的影响规律;讨论当伞盘位于药柱中部时,伞盘最大Von Mises应变随伞盘宽度、深度以及顶部圆弧半径比的变化规律。结果表明,伞盘位于药柱中部时可以有效地降低大长径比药柱的最大Von Mises应变,增加伞盘宽度、深度或选取合适的半径比均可降低伞盘结构的最大Von Mises应变。所得结论可为固体发动机设计提供参考。 相似文献
170.