拟带宽 Toeplitz 系统的秩 1 修正算法

本文以带宽Ｔｏｅｐｌｉｔｚ系统的快速并行解法为基础,通过建立秩１的修正格式讨论了拟带宽Ｔｏｅｐｌｉｔｚ系统的一种快速并行算法,其串行运算量为９ｎｈ＋Ｏ（ｈ）．设ｐ为处理机台数,当ｐ≤ｎ时,并行运算量为　;当ｐ＝３ｎ时,运算量为２ｈ￣２ｌｏｇ２ｎ＋Ｏ（１）,其中ｈ表示拟带宽宽度。     

多传感器信息的表决融合

介绍了一种多传感器信息综合方法─—表决融合。这种方法的前提是各传感器自身的处理器完成对各自的原始探测信息的处理,处理结果以合乎要求的形式输入融合中心,以便融合中心能以表决的形式进行融合处理。由于融合中心没有复杂的信息处理任务,因此,十分便于工程实现。作为例子,本文给出的是一个３传感器目标检测系统,每个传感器都定义了置信级别。融合中心的工作就是利用各传感器的检测结果和相应的置信水平来进行融合处理的。最后,还对文献１进行了探讨。     

现代舰载光电装备与高科技局部海战

以现代物理、计算机、自动控制、信息处理与融合等高新技术为支撑的现代舰载光电装备技术,在现代海战中有着举足轻重的作用.根据现代海战的基本特点,论证了高科技局部海战对光电装备的3大需求,阐述了现代舰载光电装备的类别及其发展趋势.     

磁性微粉/聚乙烯复合材料的电磁特性

研究了磁性微粉的物相组成及其与聚乙烯相复合制成的吸波材料在８． ２～１２． ４ＧＨｚ 频段内的电磁特性。结果表明： 复合材料中聚乙烯的加入量对电磁特性在上述频段内各频率范围影响程度不同； 磁性微粉中聚碳硅烷量为２０％ 时， 反射衰减大于６ｄＢ对应的频带宽度为２ＧＨｚ。     

A bicriterion approach to common flow allowances due window assignment and scheduling with controllable processing times

We investigate a single‐machine scheduling problem for which both the job processing times and due windows are decision variables to be determined by the decision maker. The job processing times are controllable as a linear or convex function of the amount of a common continuously divisible resource allocated to the jobs, where the resource allocated to the jobs can be used in discrete or continuous quantities. We use the common flow allowances due window assignment method to assign due windows to the jobs. We consider two performance criteria: (i) the total weighted number of early and tardy jobs plus the weighted due window assignment cost, and (ii) the resource consumption cost. For each resource consumption function, the objective is to minimize the first criterion, while keeping the value of the second criterion no greater than a given limit. We analyze the computational complexity, devise pseudo‐polynomial dynamic programming solution algorithms, and provide fully polynomial‐time approximation schemes and an enhanced volume algorithm to find high‐quality solutions quickly for the considered problems. We conduct extensive numerical studies to assess the performance of the algorithms. The computational results show that the proposed algorithms are very efficient in finding optimal or near‐optimal solutions. © 2017 Wiley Periodicals, Inc. Naval Research Logistics, 64: 41–63, 2017     

Reliability bounds for the NBUE distributions

In this paper, we study upper and lower bounds on the reliability in new better than used in expectation (NBUE) life distribution class with fixed first two moments. By a constructive proof, we determine the upper bounds on the reliability analytically in different regions and show that these bounds are sharp. For the lower bounds, similar results are obtained except in one region. For that region, a conjecture is given for further study. © 2002 Wiley Periodicals, Inc. Naval Research Logistics 49: 781–797, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/nav.10035     

Approximation schemes for single‐machine scheduling with a fixed maintenance activity to minimize the total amount of late work

We consider the problem of scheduling n independent and simultaneously available jobs without preemption on a single machine, where the machine has a fixed maintenance activity. The objective is to find the optimal job sequence to minimize the total amount of late work, where the late work of a job is the amount of processing of the job that is performed after its due date. We first discuss the approximability of the problem. We then develop two pseudo‐polynomial dynamic programming algorithms and a fully polynomial‐time approximation scheme for the problem. Finally, we conduct extensive numerical studies to evaluate the performance of the proposed algorithms. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 172–183, 2016     

Stochastic regret minimization for revenue management problems with nonstationary demands

We study an admission control model in revenue management with nonstationary and correlated demands over a finite discrete time horizon. The arrival probabilities are updated by current available information, that is, past customer arrivals and some other exogenous information. We develop a regret‐based framework, which measures the difference in revenue between a clairvoyant optimal policy that has access to all realizations of randomness a priori and a given feasible policy which does not have access to this future information. This regret minimization framework better spells out the trade‐offs of each accept/reject decision. We proceed using the lens of approximation algorithms to devise a conceptually simple regret‐parity policy. We show the proposed policy achieves 2‐approximation of the optimal policy in terms of total regret for a two‐class problem, and then extend our results to a multiclass problem with a fairness constraint. Our goal in this article is to make progress toward understanding the marriage between stochastic regret minimization and approximation algorithms in the realm of revenue management and dynamic resource allocation. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 433–448, 2016     

稀薄流高超声速飞行器气动加热耦合计算

针对稀薄流域高超声速飞行器的气动加热问题,开展耦合数值计算研究。通过引入牛顿冷却定律,将直接模拟蒙特卡洛数值模拟方法与结构传热计算方法相结合,设计一种可对全机外形进行气动热和结构传热计算的高效松耦合方法,实现飞行器防热层结构材料温度分布特性的数值模拟。在以钝锥外形为例对直接模拟蒙特卡洛数值模拟程序进行验证的基础上,采用该方法对X37B轨道飞行器外形长时加热与结构传热过程进行数值模拟,给出结构温度及热流密度随飞行时间的变化规律。研究结果表明,设计的耦合计算方法能够模拟稀薄流域高超声速飞行器的气动加热及结构传热耦合过程,可为该类飞行器的气动热分析及热防护设计提供技术支持。     

多功能虚拟仪器软面板的设计与实现

介绍了虚拟仪器的概念、特点 .运用虚拟仪器集成的设计思想 ,利用可视化图形编程环境 ,实现了多功能虚拟仪器软面板 ;对测试数据的保存、打印、测试过程的动态显示及仪器界面的转换等功能的实现作了深入的探讨 .