战时装备保障过程建模仿真研究

目前战时装备保障方案制定,多是依靠基本原则和经验,过程描述随意性大,同时保障活动的组织缺乏有效的手段,导致方案缺乏科学性、可操作性差。为此借鉴过程管理的思想,应用IDEF3方法建立装备保障准备阶段过程模型,形成规范的、易于交流的保障流程,依据过程模型采用离散事件仿真的方法对不同活动组合的过程效率进行了分析,改变以往根据排队理论经过大量计算分析效率的方式,实现战时快速准确优化过程的目的,为装备保障方案的形成提供方法支持。     

军队会计流程存在的问题及优化策略

在新军事变革的背景下,军队会计流程存在不适应新管理体制需要、信息技术应用对会计流程再造力度不够、军队会计科目设置影响流程等问题。本文从界定军队会计流程的含义入手,提出了优化军队会计流程、建立智能化军队会计信息系统的四项策略,即重塑军队会计流程体系、重构军队会计信息系统、调整军队会计科目体系以及完善各流程会计处理方法。优化军队会计流程、建设智能化军队会计信息系统,不仅能够反映军事经济活动的历史信息,还能为不同类型的信息使用者提供预测、决策等支持,并有利于改善军队会计核算质量,准确反映各类资产负债的价值信息和单位的真实财务状况,对于提高军队会计信息质量具有一定的借鉴意义。     

基于支持向量机的威胁判断模型

目标威胁判断是防空作战中一项重要内容,在建立目标威胁模型时,首先要挑选特征参数,分析了影响威胁度的若干因素.这里采用Rough理论中知识约简方法选择目标的特征参数;支持向量机是一类新型机器学习方法,由于其出色的学习能力,该技术已成为当前国际机器学习界的研究热点,利用支持向量机建立了威胁判断模型,给出了实例和解决此问题的支持向量机源程序.通过实例与神经网络法的结果进行了比较,结果表明支持向量机比较精确和简单.     

人工造雾成雾过程微物理性能分析

通过对人造雾宏观性能和微物理性能变化过程的观测与分析,研究了人造雾成雾过程和成雾机理,并结合对云雾生长理论的分析比较了实际雾滴粒径分布范围、生长时间等与理论计算结果的异同。结果显示人造雾的雾滴粒径和生长时间与理论计算结果基本相符,但其具体的生长过程与理论过程有所差别;人造雾与天然雾相比,雾滴数密度稍大,但雾滴粒径和含水量稍小,雾滴谱分布特点有所不同。     

Sequential and systematic sampling plans for the Markov‐dependent production process

Acceptance sampling plans are used to assess the quality of an ongoing production process, in addition to the lot acceptance. In this paper, we consider sampling inspection plans for monitoring the Markov‐dependent production process. We construct sequential plans that satisfy the usual probability requirements at acceptable quality level and rejectable quality level and, in addition, possess the minimum average sample number under semicurtailed inspection. As these plans result in large sample sizes, especially when the serial correlation is high, we suggest new plans called “systematic sampling plans.” The minimum average sample number systematic plans that satisfy the probability requirements are constructed. Our algorithm uses some simple recurrence relations to compute the required acceptance probabilities. The optimal systematic plans require much smaller sample sizes and acceptance numbers, compared to the sequential plans. However, they need larger production runs to make a decision. Tables for choosing appropriate sequential and systematic plans are provided. The problem of selecting the best systematic sampling plan is also addressed. The operating characteristic curves of some of the sequential and the systematic plans are compared, and are observed to be almost identical. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 451–467, 2001     

Asymptotically optimal component assembly plans in repairable systems and server allocation in parallel multiserver queues

T identical exponential lifetime components out of which G are initially functioning (and B are not) are to be allocated to N subsystems, which are connected either in parallel or in series. Subsystem i, i = 1,…, N, functions when at least K_i of its components function and the whole system is maintained by a single repairman. Component repair times are identical independent exponentials and repaired components are as good as new. The problem of the determination of the assembly plan that will maximize the system reliability at any (arbitrary) time instant t is solved when the component failure rate is sufficiently small. For the parallel configuration, the optimal assembly plan allocates as many components as possible to the subsystem with the smallest K_i and allocates functioning components to subsystems in increasing order of the K_i's. For the series configuration, the optimal assembly plan allocates both the surplus and the functioning components equally to all subsystems whenever possible, and when not possible it favors subsystems in decreasing order of the K_i's. The solution is interpreted in the context of the optimal allocation of processors and an initial number of jobs in a problem of routing time consuming jobs to parallel multiprocessor queues. © John Wiley & Sons, Inc. Naval Research Logistics 48: 732–746, 2001     

论师范院校语文教育理论课教学改革和实验

语文教育理论课普遍存在教学结构不合理 ,理论体系和技能训练体系不完整 ,缺乏系统性和科学性 ,理论传授与能力训练相脱节等问题 ,影响了教学质量的提高 ,制约了教学改革的展开。本文对该课程的教学结构进行重新审视、梳理 ,将之划分为两个系统 ,并将其各自要素及相互关系进行分析 ,论证了理论知识系统与教学技能训练系统在教学过程中相互对应 ,同步进行 ,共同深化的科学性和可行性。     

利用AHP确定决策方案排序的一种改进方法

针对在用AHP法求解权重排序向量时 ,用不同的计算方法导致排序方案不一致的矛盾现象 ,提出了一种在单准则下综合各个排序方案信息的方法 ,使AHP法更趋于完善     

Preservation of unimodality under shock models

A number of results pertaining to preservation of aging properties (IFR, IFRA etc.) under various shock models are available in the literature. Our aim in this paper is to examine in the same spirit, the preservation of unimodality under various shock models. For example, it is proved that in a non-homogeneous Poisson shock model if {p_k}_K≥0, the sequence of probabilities with which the device fails on the kth shock, is unimodal then under some suitable conditions on the mean value function Λ (t), the corresponding survival function is also unimodal. The other shock models under which the preservation of unimodality is considered in this paper are pure birth shock model and a more general shock model in which shocks occur according to a general counting process. © 1999 John Wiley & Sons, Inc. Naval Research Logistics 46: 952–957, 1999     

坦克发动机自行加温过程研究

为改进坦克发动机冷却系统,以12150L型坦克发动机为例,通过建立公式对发动机自行 加温过程进行了计算,得出不同条件下冷却液温度随时间的变化关系;并通过试验验证。由此为改进冷 却系统提供了理论依据。