基于状态的装备可靠度模型及其应用

为应用基于状态的装备可靠度模型,实现对装备的精确维修,采用了比例风险模型（Proportional Hazards Model,PHM）将装备的年龄信息及检测所得状态信息融入系统的风险函数中。考虑到样本包含截尾数据的情形,应用极大似然估计方法对模型中的参数进行了估计以及相应的模型检验。通过对该方法在一个实际案例中应用的详细分析,验证了方法的可行性。     

小口径舰炮对空虚拟校射校正量的最优估计

首先建立了小口径舰炮对空虚拟校射脱靶量的观测方程,分析了脱靶量的统计性质,在此基础上推导出校正量的最优估计量,并用仿真结果验证了结论的正确性。     

A novel modeling approach for express package carrier planning

Express package carrier networks have large numbers of heavily‐interconnected and tightly‐constrained resources, making the planning process difficult. A decision made in one area of the network can impact virtually any other area as well. Mathematical programming therefore seems like a logical approach to solving such problems, taking into account all of these interactions. The tight time windows and nonlinear cost functions of these systems, however, often make traditional approaches such as multicommodity flow formulations intractable. This is due to both the large number of constraints and the weakness of the linear programming (LP) relaxations arising in these formulations. To overcome these obstacles, we propose a model in which variables represent combinations of loads and their corresponding routings, rather than assigning individual loads to individual arcs in the network. In doing so, we incorporate much of the problem complexity implicitly within the variable definition, rather than explicitly within the constraints. This approach enables us to linearize the cost structure, strengthen the LP relaxation of the formulation, and drastically reduce the number of constraints. In addition, it greatly facilitates the inclusion of other stages of the (typically decomposed) planning process. We show how the use of templates, in place of traditional delayed column generation, allows us to identify promising candidate variables, ensuring high‐quality solutions in reasonable run times while also enabling the inclusion of additional operational considerations that would be difficult if not impossible to capture in a traditional approach. Computational results are presented using data from a major international package carrier. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

基于小波变换的宽带模糊函数估计器

提出了一种基于小波变换的宽带模糊函数参数估计器,即通过交互小波变换计算宽带模糊函数,取宽带模糊函数模的平方的峰值点对应参数作为目标时延与时间伸缩的估计．仿真结果表明,该估计器的估计性能好于直接模糊函数估计器,且计算方便,非常适合于实际宽带处理系统应用．     

The assignment of storage locations to containers for a container stack

Assigning storage locations to incoming or reshuffled containers is a fundamental problem essential to the operations efficiency of container terminals. The problem is notoriously hard for its combinatorial and dynamic nature. In this article, we minimize the number of reshuffles in assigning storage locations for incoming and reshuffled export containers. For the static problem to empty a given stack without any new container arrival, the optimum reshuffle sequence is identified by an integer program (IP). The integer program captures the evolution of stack configurations as a function of decisions and is of interest by itself. Heuristics based on the integer program are then derived. Their competitiveness in accuracy and time are established by extensive numerical runs comparing them with existing heuristics in literature and in practice as well as with extensions of the existing heuristics. Variants of the IP‐based heuristics are then applied to the dynamic problem with continual retrievals and arrivals of containers. Again, numerical runs confirm that the IP‐based heuristic is competitive. © 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2009     

参数估计的质量评定

本文综述了参数估计的种种标准,特别介绍了推广意义下的强、弱一致性。这些推广意义下的新标准,可以扩展传统标准的应用范围。并给予了实例论证。     

ADAPTIVE BAYES RIDGE ESTIMATION FOR THE PARAMETERS OF THE LINEAR MODEL

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编队辐射源威胁估计研究

针对编队辐射源威胁估计结果在用途上的不同要求,以编队辐射源识别过程为依据,提出了便于编队指挥员把握战场电磁态势的宏观辐射源威胁等级划分方法,并以此为基础,利用多属性决策理论研究了微观编队辐射源威胁系数的计算方法,并以编队电子对抗中的融合识别为例给出了仿真实例。实例表明,该方法可实现编队辐射源威胁估计结果在宏观与微观使用上的统一。     

飞行器有源对消隐身技术

隐身技术已经成为现代高性能飞行器设计的重要支撑,是先进战机的基本要求。现行的隐身设计方法主要包括气动外形优化以及隐身材料涂覆。随着雷达探测能力的不断提升,尤其在米波雷达探测背景下,外形优化与隐身涂层变得不再有效,有源隐身技术被重新予以重视并有望成为新的隐身技术突破点。本文着重分析了有源对消技术的基本概念、技术现状以及相应的关键技术,对该技术体制的优势和特点进行了归纳和总结。