基于局域网的分布式战斗机空战仿真系统

简要介绍了一种实时分布交互式战斗机空战仿真系统的开发。整个系统按照分层模块思想设计,对空战中战斗机关键子系统和关键行为进行了精确的数学建模,减少了建模的复杂度、保持了平台的开放性和可维护性,据此实现了局域网环境下的分布交互式空战仿真研究。初步的仿真结果表明系统具有实时、精确、高逼真度、高效费比的特点,可作为飞机设计和空战研究的重要辅助手段。     

基于正交最小二乘估计的非线性时间序列的预测

在对非线性时间序列的短期预测中经常采用局部线性化的预测算法 ,原有的算法使用普通最小二乘法 (LS)估计近似线性模型的参数。对于存在噪声的数据 ,该算法的数值稳定性较差。本文在对非线性空间进行局部线性化的基础上 ,采用正交最小二乘方法 (OLS)对线性模型同时进行结构选择与参数辨识 ,改善了数值的病态特性 ,增强了算法的稳定性     

具有节点失效的网络可靠度的信息交互算法

提出了一种用于计算具有节点失效的网络可靠度的新计算方法。该算法依据不交化代数及协同计算的思想,采用节点信息义互的方法直接获得网络的不交化最小路集。算法简便易行,具有分布计算的特点,为大型网络系统的可靠性度计算提供了一种新的途径。     

局部自动喷水灭火应用系统存在问题及对策

分析了局部自动喷水灭火系统在设计、施工、使用过程中存在的问题，并就今后局部应用系统发展提出对策。     

面向多平台多目标协同跟踪的指派问题

针对多平台多目标协同跟踪中要求多个无人地面平台尽可能均匀地协同跟踪多个目标的特点,提出了改进的离散粒子群优化算法。首先采用连续型粒子群优化算法中的速度和位置迭代公式,然后对粒子位置进行离散编码,使粒子编码对应于可行的指派方案;其次,在优化算法中引入局部搜索,提高算法寻优性能。最后将所提算法应用于多平台多目标协同跟踪中的指派问题,并与未加入局部搜索的粒子群优化算法比较,仿真结果表明,加入局部搜索后的离散粒子群优化算法具有较好的寻优性能。     

Adaptive random search for continuous simulation optimization

We present, analyze, and compare three random search methods for solving stochastic optimization problems with uncountable feasible regions. Our adaptive search with resampling (ASR) approach is a framework for designing provably convergent algorithms that are adaptive and may consequently involve local search. The deterministic and stochastic shrinking ball (DSB and SSB) approaches are also convergent, but they are based on pure random search with the only difference being the estimator of the optimal solution [the DSB method was originally proposed and analyzed by Baumert and Smith]. The three methods use different techniques to reduce the effects of noise in the estimated objective function values. Our ASR method achieves this goal through resampling of already sampled points, whereas the DSB and SSB approaches address it by averaging observations in balls that shrink with time. We present conditions under which the three methods are convergent, both in probability and almost surely, and provide a limited computational study aimed at comparing the methods. Although further investigation is needed, our numerical results suggest that the ASR approach is promising, especially for difficult problems where the probability of identifying good solutions using pure random search is small. © 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010     

Why internal conflict deteriorates state capacity? Evidence from Colombian municipalities

Previous work has documented a negative correlation between internal conflict and state capacity. We attempt to shed light on mechanisms that underlie this relationship, using data for Colombian municipalities. We rely on identifying heterogeneous effects of different types of violent events on state capacity, taking advantage of variability across municipalities in the prevalence of specific manifestations of conflict and their intensity. Our findings suggest that events making civilians feel targeted affect the state’s capacity to collect taxes, while those reflecting a stronger military capacity of illegal armies, in particular their large-scale attacks, affect the state’s capacity to provide public goods.     

基于移动自组网的智能战场架构理论研究

提出了一种基于移动自组网的智能战场网络架构模型,对基于移动自组网的网络架构模型及软件平台结构进行了描述,并将该模型和传统的通信模型进行了对比。分析结果表明,该智能战场架构模型将对实现智能战场起到积极的推动作用。     

用户意图的网络边缘主动计算方法

互联网端到端的设计原则没有区分端系统和网络间接口,使得用户分组处理期望无法告知网络,降低了网络效能。首次提出用户转发意图概念,端系统凭此向网络通告其意图,并借助网络边缘计算能力得以执行,实现用户意图在网络节点转发决策中的主动使能,构成新型主动表意网络i-ECAN。主动表意网络可以在视频直播加速、物联网数据融合、端系统安全认证等场景中得到应用。基于CORE模拟器构建网络演示环境,对无线网络切换和基于主动表意网络的无线网络切换的延迟进行比较,证明了主动表意网络机制的合理性和可行性。主动表意网络扩展了新的端系统和网络之间的接口,为人-网协同提供了基础。     

特殊半鞅的强大数定律

利用特殊半鞅的收敛定理和一般形式的Kronecker引理,给出了特殊半鞅和非负特殊半鞅强大数定律的一般形式,推广和完善了已有的结果.