最小费用树

本文在赋边权w和顶点权θ的网络中,建立了最小费用树问题的网络模型。文中对问题的复杂性进行了讨论并给出了求解问题的算法     

基于CEC系统舰艇编队防空作战最小共享信息集研究

根据最小共享信息集的概念,提出了基于CEC系统舰艇编队协同防空作战的智能系统模型,分析了舰艇编队CEC系统的作战功能和作战信息,提出了确定舰艇编队协同防空作战的最小共享信息集的事件法,并应用信息论证明了事件法的确能够减少通信的信息量。在上述基础上,确定了舰艇编队协同防空作战的最小共享信息集。     

某装备系统机电产品贮存可靠性评估方法

针对某装备系统机电产品长期自然贮存环境下可靠性无法准确评估的难题,提出了一种基于极小χ2估计和拟合优度检验的贮存可靠性评估方法,并对试验数据进行了分析、计算和处理。该方法通过拟合产品的失效分布来确定其分布函数参数,并根据确定的分布函数来预测产品的贮存可靠寿命。与现有的评估方法相比,采用该方法确定的分布函数更能反映产品的可靠性变化规律,对机电产品的贮存寿命预测结果更加合理,在工程研究领域具有很好的实用价值。     

Minimum violations and predictive meta‐rankings for college football

This article presents two meta‐ranking models that minimize or nearly minimize violations of past game results while predicting future game winners as well as or better than leading current systems—a combination never before offered for college football. Key to both is the development and integration of a highly predictive ensemble probability model generated from the analysis of 36 existing college football ranking systems. This ensemble model is used to determine a target ranking that is used in two versions of a hierarchical multiobjective mixed binary integer linear program (MOMBILP). When compared to 75 other systems out‐of‐sample, one MOMBILP was the leading predictive system while getting within 0.64% of the retrodictive optimum; the other MOMBILP minimized violations while achieving a prediction total that was 2.55% lower than the best mark. For bowls, prediction sums were not statistically significantly different from the leading value, while achieving optimum or near‐optimum violation counts. This performance points to these models as potential means of reconciling the contrasting perspectives of predictiveness versus the matching of past performance when it comes to ranking fairness in college football. © 2013 Wiley Periodicals, Inc. Naval Research Logistics 61: 17–33, 2014     

An interactive approach to multicriteria sorting for quasiconcave value functions

In this article, we develop an interactive algorithm to place alternatives in ordered preference classes for a decision maker (DM) with an increasing quasiconcave value function. Such value functions are quite general in that they include linear and concave value functions. Our aim is to elicit sorting information from the DM as few times as possible; our algorithm places other alternatives using previous responses from the DM utilizing properties of quasiconcave value functions. As an application, we sort 81 global MBA programs into preference classes using criteria such as alumni career progress, idea generation, and diversity. We study the performance of our proposed algorithm, when we change the number of criteria, number of alternatives, and introduce response errors. © 2014 Wiley Periodicals, Inc. Naval Research Logistics 61: 447–457, 2014     

一类分段线性费用网络流问题

本文通过把一类分段线性费用网络流问题化成线性费用网络流问题,给出了求解这类分段线性费用网络流问题的算法。     

气液两相管流流型识别理论研究进展

综述了气液两相流流型识别理论及方法的研究进展。首先探讨了流型划分问题，然后针对水平管路、垂直管路及摇摆管路介绍了两相流流型转换机理及转换的边界条件；对于流型的在线识别，介绍了基于波动理论、神经网络和图像处理的流型识别方法。最后提出了气液两相管流流型识别中亟待开展的理论研究方向。     

Estimating failure time distribution and its parameters based on intermediate data from a Wiener degradation model

Instead of measuring a Wiener degradation or performance process at predetermined time points to track degradation or performance of a product for estimating its lifetime, we propose to obtain the first‐passage times of the process over certain nonfailure thresholds. Based on only these intermediate data, we obtain the uniformly minimum variance unbiased estimator and uniformly most accurate confidence interval for the mean lifetime. For estimating the lifetime distribution function, we propose a modified maximum likelihood estimator and a new estimator and prove that, by increasing the sample size of the intermediate data, these estimators and the above‐mentioned estimator of the mean lifetime can achieve the same levels of accuracy as the estimators assuming one has failure times. Thus, our method of using only intermediate data is useful for highly reliable products when their failure times are difficult to obtain. Furthermore, we show that the proposed new estimator of the lifetime distribution function is more accurate than the standard and modified maximum likelihood estimators. We also obtain approximate confidence intervals for the lifetime distribution function and its percentiles. Finally, we use light‐emitting diodes as an example to illustrate our method and demonstrate how to validate the Wiener assumption during the testing. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

基于RLS算法的自适应逆控制系统的研究

提出了一种基于RLS算法的自适应逆控制系统,并对最小相位对象和非最小相位对象分别用此系统建模,进行仿真研究.仿真结果表明,基于RLS算法的自适应逆控制系统的收敛速度快,抗干扰性能好,而且得到的稳态误差较小.     

确定重构相空间维数的方法

计算混沌统计特征量前必须先获得重构相空间的维数,因此给出了最大特征值不变法、几何不变量法、虚假邻点法、预测误差最小法、最小Shannon熵法、经验赋值法六种确定方法,得出了应用最大特征值不变法和最小Shannon熵法的工程案例计算结果。