储油罐区灭火确定冷却兵力部署的模拟模型

本文提出了冷却燃烧罐和邻近罐时水枪应放置的位置的一系列数学描述原则,从而建立了油罐灭火冷却力量部署的模拟模型,该模型可方便地用于计算机模拟系统。     

一种性能驱动的时序规划方法

在超级计算机体系结构设计阶段 ,有必要进行时序规划 ,以尽早判断设计方案和性能指标的物理可实现性。提出一种性能驱动的时序规划方法 ,采用适于组件性能描述的时序性能模型 ,并按照线网权重分配路径延时余量 ,算法具有效率高、延时分配合理的优点     

火控雷达的仿真目标建模及实现

中外军队的实践证明 :模拟训练是一种最简便、成本低、效果好的训练方式。对于需要空情保障和训练成本高的雷达训练来说更是如此。探讨了火控雷达回波信号的模型建立及实施方案。     

A single‐period inventory placement problem for a serial supply chain

This article addresses the inventory placement problem in a serial supply chain facing a stochastic demand for a single planning period. All customer demand is served from stage 1, where the product is stored in its final form. If the demand exceeds the supply at stage 1, then stage 1 is resupplied from stocks held at the upstream stages 2 through N, where the product may be stored in finished form or as raw materials or subassemblies. All stocking decisions are made before the demand occurs. The demand is nonnegative and continuous with a known probability distribution, and the purchasing, holding, shipping, processing, and shortage costs are proportional. There are no fixed costs. All unsatisfied demand is lost. The objective is to select the stock quantities that should be placed different stages so as to maximize the expected profit. Under reasonable cost assumptions, this leads to a convex constrained optimization problem. We characterize the properties of the optimal solution and propose an effective algorithm for its computation. For the case of normal demands, the calculations can be done on a spreadsheet. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48:506–517, 2001     

An integer programming model for the weekly tour scheduling problem

We study a workforce planning and scheduling problem in which weekly tours of agents must be designed. Our motivation for this study comes from a call center application where agents serve customers in response to incoming phone calls. Similar to many other applications in the services industry, the demand for service in call centers varies significantly within a day and among days of the week. In our model, a weekly tour of an agent consists of five daily shifts and two days off, where daily shifts within a tour may be different from each other. The starting times of any two consecutive shifts, however, may not differ by more than a specified bound. Furthermore, a tour must also satisfy constraints regarding the days off, for example, it may be required that one of the days off is on a weekend day. The objective is to determine a collection of weekly tours that satisfy the demand for agents' services, while minimizing the total labor cost of the workforce. We describe an integer programming model where a weekly tour is obtained by combining seven daily shift scheduling models and days‐off constraints in a network flow framework. The model is flexible and can accommodate different daily models with varying levels of detail. It readily handles different days‐off rules and constraints regarding start time differentials in consecutive days. Computational results are also presented. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 607–624, 2001.     

多次点火固体火箭发动机在面空导弹上的应用研究

论述了多次点火固体火箭发动机的多次点火的最佳控制,具体研究了两次点火固体火箭发动机的参数对飞行性能的影响,对两次点火固体火箭发动机结合弹道同时最佳化问题给出了仿真结果.     

舰炮系统的分布式交互仿真概述

论述了舰炮系统的分布式交互仿真 (DIS) ,建立了舰炮系统DIS模型并简述了各仿真模块的功能     

索赔离散到达的风险模型

讨论了索赔到达时间和索赔额均服从几何分布的风险模型 ,利用逐段决定马尔可夫骨架过程的广义生成算子去构造有关盈余过程的鞅 ,精确求解了模型的破产概率     

解决大功率柴油机曲轴箱通气装置漏油的途径

介绍了采用气体循环解决某型坦克发动机通气装置漏油问题的方法,通过建立进气系统模型、缸内过程模型、排气系统模型、气体循环系统模型,为进行精确的计算奠定了基础,同时也为硬件设计提供了方案.     

城市环境下单无人机测向定位航迹优化算法

为解决单架无人机在城市环境中对辐射源目标的定位问题,提出了一种基于环境预测法的单无人机测向定位航迹优化算法。使用交互多模型-扩展卡尔曼滤波进行视距和非视距信号混合环境下的目标估计。结合估计的目标位置和城市地理信息模型,基于视线追踪法求解信号遮挡区域和多径信号干扰区域。在滚动时域控制算法框架下生成无人机预测轨迹,以最大化Fisher信息矩阵行列式为测向定位评价准则,考虑建筑物障碍以及其对信号的遮挡和反射效应对无人机测向定位航迹的影响,控制无人机选择最优航向飞行。仿真结果表明,该方法能够使无人机在存在障碍、信号遮挡和多径干扰的环境下实现对目标的高精度测向定位,为解决城市环境下的单架无人机测向定位问题提供了新思路。