反红外隐身飞机技术研究

随着隐身技术在军用飞机上的广泛应用,反隐身技术成为赢取未来高技术战争必须研究的课题.以F-117 A和B-2飞机为例,分析了现有的飞机红外隐身技术措施,对红外隐身前后系统作用距离进行估算,重点阐述了未来反红外隐身飞机的技术措施,对飞机反隐身技术的发展提出了展望.     

Analysis of a finite‐buffer bulk‐service queue with discrete‐Markovian arrival process: D‐MAP/Ga,b/1/N

Discrete‐time queues with D‐MAP arrival process are more useful in modeling and performance analysis of telecommunication networks based on the ATM environment. This paper analyzes a finite‐buffer discrete‐time queue with general bulk‐service rule, wherein the arrival process is D‐MAP and service times are arbitrarily and independently distributed. The distributions of buffer contents at various epochs (departure, random, and prearrival) have been obtained using imbedded Markov chain and supplementary variable methods. Finally, some performance measures such as loss probability and average delay are discussed. Numerical results are also presented in some cases. © 2003 Wiley Periodicals, Inc. Naval Research Logistics 50: 345–363, 2003.     

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     

基于层次分析法的人为电磁环境复杂程度评估

针对战场电磁环境复杂多变,定性、定量描述难的特点,运用层次分析法(AHP)探索人为电磁环境复杂程度评估问题。建立了评估人为电磁环境的递阶层次结构,细化了评估指标,明确了评价标准,并通过对组合权重的计算,最终将对人为电磁环境复杂程度的评估转换为13个底层参量的检测数据,4个分值标准和5个评定层次。该方法对评估电磁环境的一般复杂性和特定复杂性具有一定的指导意义,较好地满足了战场电磁环境复杂程度评估的需求。     

FlexRay在导弹测试系统中的应用

针对导弹测试系统可靠性差、通信速率低的缺点,在分析测试需求的基础上,提出了一种基于Flex Ray总线技术的导弹测试系统总体设计方案,给出了数字信号处理器与总线控制器的接口硬件电路、软件流程,分析了设计中需要考虑的主要问题。     

基于模糊数的防空C3I系统效能评估

根据模糊数适于量化模糊信息的特点,运用模糊集理论,提出了一种基于模糊数的模糊综合评估方法.通过计算被评估系统效能的模糊数,将问题转化为模糊数的排序问题,并给出了采用该方法对防空C3I系统效能评估的模型及实现步骤.该方法能对防空C3I系统的效能指标进行合理的量化处理,较好地解决了防空C3I系统效能评估问题,通过计算实例验证了该方法的正确性和实用性.     

美军ASPEN1000DM净水装置对我军反渗透野营供水装备研究的启示

消化研究美军ASPEN1000DM反渗透净水装置,掌握了其技术性能参数和净水工艺流程,并对其先进性和不足之处进行综合评价。在此基础上,提出我军应从改进反渗透系统进水的预处理、增加装置能源的选择性、研制能量回收装置和优化反渗透净水装置的设计以及水质在线监测等方面加强反渗透净水装备的研制,以提高我军供水装备的水平。     

指定目标不延误条件下的拦截决策算法

从现有的拦截排序准则出发,根据实际作战中进袭目标的特点,应用现代排序理论,分别建立了动态目标拦截排序模型和总损失最小化模型,给出相应的求解算法。最后实例计算得出模型既体现了现有的拦截准则,又对现有的准则进行了推广。     

太平天国北伐的两个问题研究

准确地说,太平天国起义后有两次北伐。太平天国第一次北伐的目的地是哪?学界多认为是小天堂南京,笔者认为应是河南和北京,否则不能解释太平天国自广西出发后游行半个中国再到南京的问题。以往论者多采用罗大纲的供词论证太平天国第二次北伐的战略,笔者认为罗大纲供词不足为据。第二次北伐为什么不取最便捷的京杭运河而由浦口向北向西,经安徽、河南等数省取北京呢?笔者认为是杨秀清军事战略的失误,这导致了太平军北伐最终失利。     

RGB-D传感器的标定实验分析

分析了RGB-D传感器的标定模型及标定方法,利用标定棋盘和Matlab工具箱对RGB-D传感器进行了标定。采用摄像机标定方法计算了彩色摄像机和深度摄像机的初始化参数,根据标定棋盘和标定板的共面关系计算了相对位姿的初始估计值,并采用非线性最小化方法对标定参数进行了优化。实验结果表明:标定后的彩色图像和深度图像的重投影误差较小,深度测量不确定性标准差比标定前约减小了1/2,有效地提高了RGB-D传感器的测量精度。