准最优增量搜索效率分析

在对极限搜索圆进行特殊分割的条件下,导出准最优增量搜索和准最优总量搜索发现目标概率的计算公式,并通过对搜索力变化时两种发现概率的比较,得出了准最优增量搜索优于准最优总量搜索的重要结论.     

军事训练演习数据汇集与融合系统的设计与实现

实现海量军事训练演习数据的汇集与融合,是生成相应的作战效能数据的基础。结合军事训练基地数据的收集与运用现状,提出了一个基于Web服务的多源异构数据汇集与融合系统的解决方案：运用XML Schema技术实现了异构数据模式的标准化转换,完成了多源数据的汇集;以作战平台为中心,以作战效能的各项影响因素为维度,实现了相关数据的融合。设计了系统的功能与架构并加以实现。运行情况表明,系统能够满足功能需求,具备良好的数据整合与处理能力。     

公共服务均等化视域下新疆南疆教育扶持政策研究

新疆南疆落后的经济社会造成教育发展缓慢、水平低下，大力发展南疆教育具有极端重要性，近年来国家对南疆教育实施了一系列扶持政策并且取得了良好的效果。本文运用公共服务均等化的分析框架，对南疆教育扶持政策所体现出的价值取向、政府职能转变，以及教育公共服务均等化的物质基础和逻辑起点等四个方面进行了理性分析，并从大力发展国民经济、优化资源配置机制和完善转移支付制度三个角度提出优化南疆教育均等化的建议。     

The effect of terror on job stability among security guards

Palestinian uprising, ‘intifada’, aggravated the recession of 2001–2004 in Israel which dampened demand for labor in all industries except security services. We use this exogenous shock to study whether a cohort of young men who were attached to temporary jobs as security guards for unusually long periods of time during the intifada landed on an inferior career path, as compared to security guards from a pre-intifada cohort. We find that the intifada cohort had less employment mobility, were ultimately less connected with the labor market, and earned less on jobs after the security services, relatively to the pre-intifada cohort.     

基于语义的AdHoc网络服务发现

在分析现有的Ad Hoc网络服务发现方法的基础上,提出一种基于语义的Ad Hoc网络服务发现方法。该方法基于语义推理机制,能对服务进行准确地刻画,大大提高了查准率;又由于该方法在考虑服务本身的同时,还考虑了服务的节点属性和节点所处的环境属性,可以有效地改善服务质量。仿真结果表明,与同类的Ad Hoc网络服务发现方法相比,该方法在查准率方面具有较大的优越性。     

A misclassification cost‐minimizing evolutionary–neural classification approach

Machine learning algorithms that incorporate misclassification costs have recently received considerable attention. In this paper, we use the principles of evolution to develop and test an evolutionary/genetic algorithm (GA)‐based neural approach that incorporates asymmetric Type I and Type II error costs. Using simulated, real‐world medical and financial data sets, we compare the results of the proposed approach with other statistical, mathematical, and machine learning approaches, which include statistical linear discriminant analysis, back‐propagation artificial neural network, integrated cost preference‐based linear mathematical programming‐based minimize squared deviations, linear integrated cost preference‐based GA, decision trees (C 5.0, and CART), and inexpensive classification with expensive tests algorithm. Our results indicate that the proposed approach incorporating asymmetric error costs results in equal or lower holdout sample misclassification cost when compared with the other statistical, mathematical, and machine learning misclassification cost‐minimizing approaches. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006.     

空间绳网系统展开动力学特性分析

空间绳网系统是一种新型轻质空间柔性结构,具有很大的应用价值。针对地面环境和太空环境下的不同受力特性,推导空间绳网动力学模型;通过地面试验验证仿真模型的可信度;基于展开面积、飞行距离等性能参数,仿真分析空间绳网展开过程中的绳网位形、应力分布以及能量变化等动力学特性,分析轨道高度、捕获方向和发射参数对展开效果的影响。     

灰色组合模型在股指预测中的新发现

针对四项灰色组合模型,提出了较优的最佳等维新息两项组合灰色模型预测。通过证券市场股指预测的实证分析,发现灰色组合模型均不及两次拟合灰色模型适用。     

Research communication security in the 90s: A view from the UK

This paper develops a methodology for measuring the capital value of military assets in monetary terms. We distinguish between two military capital measures. One measure, called the value of military capital (services) summarizes the value of military defense assets during a particular year. A comparison of the capital‐services value of U.S. and Soviet tactical combat aircraft is provided for the period 1970–1984.

One feature of the capital‐services measure that makes it particularly interesting is that its size can be compared with such military expenditures as operating and support. While these latter expenditures reflect the readiness of a defense establishment, the relevant capital‐services measure reflects force structure and modernization.

A second measure, called the value of military capital (wealth), summarizes the military benefits obtained from defense assets over the remainder of their service lives. This measure depreciates the capital as it ages, and is useful for comparing military wealth with other types of wealth in the economy. We provide this measure for the U.S. military capital stock for 1925–1984.     

Web GIS／“北斗”技术在应急器材保障系统中的应用研究

通过分析万维网地理信息技术、"北斗"卫星定位技术和网络技术的综合应用,提出了应用Web GIS和"北斗"卫星定位技术的应急器材保障系统的基本思路和方法,探讨了实现应急器材保障系统的技术途径.