Disruption management in production planning

We study the problem of recovering a production plan after a disruption, where the disruption may be caused by incidents such as power failure, market change, machine breakdown, supply shortage, worker no‐show, and others. The new recovery plan we seek after has to not only suit the changed environment brought about by the disruption, but also be close to the initial plan so as not to cause too much customer unsatisfaction or inconvenience for current‐stage and downstream operations. For the general‐cost case, we propose a dynamic programming method for the problem. For the convex‐cost case, a general problem which involves both cost and demand disruptions can be solved by considering the cost disruption first and then the demand disruption. We find that a pure demand disruption is easy to handle; and for a pure cost disruption, we propose a greedy method which is provably efficient. Our computational studies also reveal insights that will be helpful to managing disruptions in production planning. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005.     

A concave‐cost production planning problem with remanufacturing options

We focus on the concave‐cost version of a production planning problem where a manufacturer can meet demand by either producing new items or by remanufacturing used items. Unprocessed used items are disposed. We show the NP‐hardness of the problem even when all the costs are stationary. Utilizing the special structure of the extreme‐point optimal solutions for the minimum concave‐cost problem with a network flow type feasible region, we develop a polynomial‐time heuristic for the problem. Our computational study indicates that the heuristic is a very efficient way to solve the problem as far as solution speed and quality are concerned. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005     

培育人民军队过硬战斗精神努力推进军事斗争准备

战争是敌对双方物质和精神力量的综合较量,培养过硬的战斗精神对取得战争胜利至关重要。培养过硬战斗精神必须不断强化官兵“军魂”意识,必须把握其衡量评判标准,必须认清其生成机制,必须塑造正确的价值导向。     

小口径火炮侵彻钢靶模拟实验研究及有限元分析

对小口径火炮侵彻钢靶问题,分别进行了实验和有限元分析,并将所得结果进行了比较;分析了小口径火炮侵彻钢靶的侵彻过程,得到了带空腔弹丸高速垂直侵彻钢板的典型破坏模式.     

基于随机虚拟样机的某型自行火炮扭力轴动力仿真

依据随机动力学、多体系统动力学和数理统计理论,借助MSC\Adams仿真软件和MATLAB工具,提出随机虚拟样机的概念。并以某型自行火炮的扭力轴为例,在建立的虚拟样机上,实现不确定性因素下从底盘整体到悬挂系统、再到扭力轴的动力仿真。     

身管武器生产定型时机的量化决策

提出以大型试验批个数来确定身管武器生产定型时机的方法,并依据统计决策与贝叶斯分析方法,结合专家信息与收集的数据,对身管武器生产定型时机作出量化判定,为定型委员会的决策提供理论与数据支持。     

基于特征融合的刀具磨损监测方法

提出了一种基于特征融合的刀具磨损监测方法,将该方法应用于铣刀磨损监测取得了较好的效果,文中论述了特征融合方法的基本思想,多传感器信号的特征关联、抽取及正规化处理,作为融合中心的神经网络的构造及训练等内容。实验分析表明,该方法实现刀具磨损监测是行之有效的。     

分布共享存储系统中程序访存行为对性能的影响

本文首先提取了分布共享存储系统（ＤＳＭ）中程序访存行为的几个重要参数,并以此建立了一个处理机效率模型。在此模型基础上分析了访存行为的各种因素对处理机效率的影响情况,文章最后给出了提高处理机效率的几种技术途径。     

球面聚焦超声场计算与测量实验

研究了球面聚焦超声场的声压场计算.应用物理声学方法,推导了聚焦超声场声压的积分表达式,并通过数值分析法进行了计算和仿真,同时讨论了两种特殊情况下的声压近似解析式.最后推出了测量高强度聚焦超声装置声压的实例,其结果与理论仿真结果相近,偏差不大于3%.     

Bayesian sampling plans for exponential distributions with interval censored samples

This article studies the problem of designing Bayesian sampling plans (BSP) with interval censored samples. First, an algorithm for deriving the conventional BSP is proposed. The BSP is shown to possess some monotonicity. Based on the BSP and using the property of monotonicity, a new sampling plan modified by the curtailment procedure is proposed. The resulting curtailed Bayesian sampling plan (CBSP) can reduce the duration time of life test experiment, and it is optimal in the sense that its associated Bayes risk is smaller than the Bayes risk of the BSP if the cost of the duration time of life test experiment is considered. A numerical example to compute the Bayes risks of BSP and CBSP and related quantities is given. Also, a Monte Carlo simulation study is performed to illustrate the performance of the CBSP compared with the BSP. The simulation results demonstrate that our proposed CBSP has better performance because it has smaller risk. The CBSP is recommended. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 604–616, 2015