装备保障综合演练风险分析

采用工作结构分解(Work Breakdown Structure,WBS)和风险结构分解法(Risk Breakdown Structure,RBS)对装备保障综合演练全过程的风险及其风险因素进行了系统分析,得出了装备保障综合演练过程中存在的7类风险、24种风险因素;运用网络层次分析法(Analytic Network Process,ANP)对各种风险及其风险因素进行了评估,得出了其对装备保障综合演练风险影响的权重及排序。研究结果可为装备保障综合演练顺利开展,确保人员、装备安全提供参考。     

平面 NURBS 曲线的椭圆弧自适应逼近

给出了用椭圆弧及双椭圆弧自适应逼近平面NURBS曲线的算法。算法所得到的椭圆样条能够G1连续 ,双椭圆样条还能够保形。与现行的圆弧逼近算法相比 ,本算法不需要求解非线性方程组 ,而是由给定的插补误差自动计算参数增量 ,得到椭圆曲线的特征点 ,还可以将误差控制在预期的范围之内 ;与现行的直线插补方法相比 ,不需要额外的时间和空间 ,也适用于CNC环境。本算法在腔体加工、二维轮廓加工等方面有特别的实用价值。     

模型三组元喷嘴雾化SMD变化规律

为了充分研究新型三组元喷嘴的内混腔雾化特性 ,设计了模型喷嘴进行多工况试验。试验发现 ,维持气体或液体压降不变 ,改变另一种介质的压降 ,会得到不同的雾化平均直径随气体压降或液体压降 ,以及气液比ALR的变化曲线 ,这些曲线有着明显的规律。大量试验表明 ,虽然平均直径SMD随气体压降或液体压降的变化曲线明显不同 ,但其随气液比的变化规律却趋于相同     

提高理工科学生听力水平的探讨

本文紧紧围绕目前理工科学生实际听力水平状况,详细分析了影响理工科学生听力水平提高的两大制约因素,即语言因素和心理因素;讨论了语言教师针对这两大因素如何加强听力教学;最后根据全国四、六级英语统考题型,提出了听力测试中的有关技巧。     

“常规武器装备研制程序”的不足与改进

我国早期制定的《常规武器装备研制程序》,已不能适应当今武器装备研制过程中的可靠性和装备综合保障的新的观念和要求.现分析了原研制程序在这方面的不足,并提出修订研制程序的阶段划分并调整各阶段工作内容的建议;从根本上规范了武器装备研制工作,使其与装备综合保障工作同步进行和相互协调,以求所研制的武器装备交付部队使用后,能尽快形成战斗力.     

坦克团装备技术保障能力评价模型

在效能—费用分析的基础上,提出了一个坦克团装备保障评价模型.该模型通过对坦克团有关统计数据的分析、加工和综合处理,生成一个评价参数,量化反映坦克团装备保障的能力.     

An exact analysis of a joint production‐inventory problem in two‐echelon inventory systems

We consider a two‐echelon inventory system with a manufacturer operating from a warehouse supplying multiple distribution centers (DCs) that satisfy the demand originating from multiple sources. The manufacturer has a finite production capacity and production times are stochastic. Demand from each source follows an independent Poisson process. We assume that the transportation times between the warehouse and DCs may be positive which may require keeping inventory at both the warehouse and DCs. Inventory in both echelons is managed using the base‐stock policy. Each demand source can procure the product from one or more DCs, each incurring a different fulfilment cost. The objective is to determine the optimal base‐stock levels at the warehouse and DCs as well as the assignment of the demand sources to the DCs so that the sum of inventory holding, backlog, and transportation costs is minimized. We obtain a simple equation for finding the optimal base‐stock level at each DC and an upper bound for the optimal base‐stock level at the warehouse. We demonstrate several managerial insights including that the demand from each source is optimally fulfilled entirely from a single distribution center, and as the system's utilization approaches 1, the optimal base‐stock level increases in the transportation time at a rate equal to the demand rate arriving at the DC. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011     

Approximation methods for the analysis of a multicomponent,multiproduct assemble‐to‐order system

In this article, we consider the performance evaluation of a multicomponent, multiproduct assemble‐to‐order (ATO) system. Each component is managed independently using a base‐stock policy at a supply facility with limited production capacity and an infinite buffer. The arrivals of demands follow a multivariate Poisson process and unfilled demands are backlogged. Because exact analysis of the proposed system is not feasible, we propose two approximation methods which provide upper and lower bounds for various performance measures such as fill rate, average waiting time, and average number of backorders of the proposed system. Our computational experiments demonstrate the effectiveness of the two approximation methods under various system settings. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011     

基于小波变换和支持向量机的水下目标分类方法

水下目标识别技术是世界各国十分重视的研究课题之一,具有重要的理论和应用价值。简要介绍了小波变换、多分辨率分析及支持向量机的基本原理,针对舰船辐射噪声信号,利用小波变换来完成信号的预处理和滤波,在小波变换后信号的多尺度子空间上提取信号的能量特征参数,归一化处理后构建特征向量,最后用支持向量机算法进行分类。仿真结果表明,利用小波变换的多分辨率分析和支持向量机能对舰船辐射噪声信号进行有效分类识别。     

OCPN装备综合保障工作流引擎设计

针对装备综合保障工作流建模要求,构建了对象有色Petri网(Object-Oriented Colored Petri Net,OCPN)模型,给出该模型的形式化定义。结合装备使用过程综合保障工作,建立基于OCPN的工作流模型。根据工作流的执行过程,进行了工作流引擎体系结构以及相关类的设计,为工作流模型的计算机化以及工作流管理系统设计与实现提供了一种新的思路。