基于微分几何与李群的无人机编队会合方法

在领航-跟随编队模式下,设计了一种基于追缉策略的无人机编队会合方法。首先,基于微分几何曲线论和弗雷涅-塞雷标架建立了无人机非解耦三维运动模型,其中将曲率和挠率作为控制量;结合该模型给出了无人机三维编队会合问题的数学描述,它将导弹制导问题中的终端落角约束映射为编队会合问题中僚机的航迹倾角约束,同时引入额外的航迹方位角约束;然后使用特殊正交群的元素来度量长僚机方向偏差,并通过局部坐标映射将其映射为对应李代数空间中的旋量;接着,基于该旋量设计了编队会合几何导引律,并给出相应的曲率和挠率控制指令;最后,分别在长机稳定平飞和转弯机动条件下进行了多机编队会合数字仿真实验,仿真结果显示僚机能够有效地跟踪长机航向并收敛至指定位形,说明了方法的有效性。     

谈外国旅游团来琼免签政策实施的不足与完善

外国旅游团来琼免签政策是目前我国实施时间最长、最宽松的区域性免签便利政策。阐述了外国旅游团来琼免签政策沿革演变历程,从入出境管理和边防检查的角度分析了其施行过程中存在的不足与原因,提出了完善免签政策的措施。     

基于改进萤火虫优化算法的BP神经网络目标群威胁判断

以舰艇防空作战目标选择决策和规划需求为背景,针对萤火虫算法求解精度不高且收敛速度较慢的问题,提出可动态调整步长的改进萤火虫优化算法。在改进萤火虫优化算法的基础上,建立基于改进萤火虫优化算法的BP神经网络目标群威胁判断结构模型。通过改进萤火虫算法优化BP神经网络的初始权值和阈值,能够更好地预测测试集。实验结果表明,该方法可快速、准确地实现目标群威胁判断。     

Estimating the probability that a simulated system will be the best

Consider a stochastic simulation experiment consisting of v independent vector replications consisting of an observation from each of k independent systems. Typical system comparisons are based on mean (long‐run) performance. However, the probability that a system will actually be the best is sometimes more relevant, and can provide a very different perspective than the systems' means. Empirically, we select one system as the best performer (i.e., it wins) on each replication. Each system has an unknown constant probability of winning on any replication and the numbers of wins for the individual systems follow a multinomial distribution. Procedures exist for selecting the system with the largest probability of being the best. This paper addresses the companion problem of estimating the probability that each system will be the best. The maximum likelihood estimators (MLEs) of the multinomial cell probabilities for a set of v vector replications across k systems are well known. We use these same v vector replications to form v^k unique vectors (termed pseudo‐replications) that contain one observation from each system and develop estimators based on AVC (All Vector Comparisons). In other words, we compare every observation from each system with every combination of observations from the remaining systems and note the best performer in each pseudo‐replication. AVC provides lower variance estimators of the probability that each system will be the best than the MLEs. We also derive confidence intervals for the AVC point estimators, present a portion of an extensive empirical evaluation and provide a realistic example. © 2002 Wiley Periodicals, Inc. Naval Research Logistics 49: 341–358, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/nav.10019     

高炮旅(团)作战面向对象Petri网模型

概要分析了高炮旅(团)指挥控制与信息处理分发过程,对基本Petri进行扩展构建了面向对象Petri网模型,采用其分层次构建了高炮旅(团)作战OPN模型,较好地实现了对传统指控体制下高炮群作战与信息分发过程的静态与动态描述,为下一步具体仿真实现,找出现有传统指控体制存在的薄弱环节,进行相应改进提供了基础和依据。     

MPP数据并行FORTRAN汇编代码模拟环境的设计与实现

本文阐述了一种在单机上模拟ＭＰＰ机执行并行汇编代码的方法。这种并行汇编代码由ＭＰＰＦＯＲＴＲＡＮ编译器生成。由于在一个大型工程中，编译生成的目标代码运行环境不一定能及时具备，所以，研制汇编代码模拟环境ＤＰＦＡＳ有助于及早验证编译目标代码的正确性和完备性。本文通过共享进程组在ＳＧＩ工作站上实现多机环境模拟和远程地址访问模拟。此模拟环境的实现对ＭＰＰ数据并行ＦＯＲＴＲＡＮ编译器的正确性验证和效率评估有一定的帮助。     

模糊多属性群决策与潜艇作战方案优选

分析了潜艇作战方案的优选实质是一个模糊多属性的群决策过程,建立了模糊多属性群决策的一般模型,介绍了一种以模糊理想解与模糊负理想解同时作为参照基准,以海明距离作为测度工具,以相对贴近度作为衡量标准的模糊折衷型多属性群决策方法,应用实例表明此方法可行有效。     

Fully sequential procedures for comparing constrained systems via simulation

We consider the problem of finding the system with the best primary performance measure among a finite number of simulated systems in the presence of a stochastic constraint on a single real‐valued secondary performance measure. Solving this problem requires the identification and removal from consideration of infeasible systems (Phase I) and of systems whose primary performance measure is dominated by that of other feasible systems (Phase II). We use indifference zones in both phases and consider two approaches, namely, carrying out Phases I and II sequentially and carrying out Phases I and II simultaneously, and we provide specific example procedures of each type. We present theoretical results guaranteeing that our approaches (general and specific, sequential and simultaneous) yield the best system with at least a prespecified probability, and we provide a portion of an extensive numerical study aimed at evaluating and comparing the performance of our approaches. The experimental results show that both new procedures are useful for constrained ranking and selection, with neither procedure showing uniform superiority over the other.© 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010     

健康跑对增进体质弱势群体女大学生身心健康的研究

运用文献资料、问卷调查法和数理统计法，对高校女大学生体质弱势群体开展健康跑进行了实验研究。结果表明：体质弱势群体女大学生长期进行健康跑锻炼后，有氧耐力得到了明显的提高，改善了心肺机能，并且带来了积极的主观感受体验，对弱势群体女大学生增强体质，保持青春活力有重要作用。     

基于熵权多目标决策的雷达网战损装备抢修排序方法

分析了熵权的理论基础，给出了一种基于熵权多目标决策的雷达网战损装备抢修排序方法。其中，采用熵权与决策者的主观权重相结合的方法确定综合权重，使权重的确定更加合理。最后通过实例对该方法的可行性和实用性进行了说明。