On‐line parameter estimation for a partially observable system subject to random failure

In this paper, we study the on‐line parameter estimation problem for a partially observable system subject to deterioration and random failure. The state of the system evolves according to a continuous time homogeneous Markov process with a finite state space. The system state is not observable, except for the failure state. The information related to the system state is available at discrete times through inspections. A recursive maximum likelihood (RML) algorithm is proposed for the on‐line parameter estimation of the model. The RML algorithm proposed in the paper is considerably faster and easier to apply than other RML algorithms in the literature, because it does not require projection into the constraint domain and calculation of the gradient on the surface of the constraint manifolds. The algorithm is illustrated by an example using real vibration data. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

分形信号的滤波算法

提出了分形信号的小波分解与重构的一种快速算法。针对分形信号的自相似和长时相关的特点，采用离散小波变换（DWT）对分形信号进行多尺度分解，使其成为各尺度上的近似平稳信号，从而可利用通常的Wiener滤波或Kalman滤波方法进行估计，然后再由DWT进行多尺度重构，估计出被噪声污染了的原始信号。重点对DWT的滤波过程进行算法设计，并估计了计算复杂度。     

C3I系统效能仿真方法及环境研究

采用面向对象的方法和离散事件仿真技术,探讨了C3I系统效能仿真方法,并介绍了C3I系统效能仿真环境的设计思想。该环境能够支持多种模型的集成仿真,并易于扩展和扩充。     

离散小波改进算法在机动车辆换挡信号降噪中的应用

针对机动车辆换挡信号中存在大量强电磁及环境振动噪声的问题,同时考虑到实时性和硬件实现性能的需求,基于最小带宽离散小波算法,提出了简化的、适用于工程实现的小波分解层数确定方法;然后利用初始阈值对各层小波系数进行分类,利用各层中各类系数均值差的模及均方差为依据,设计了各层阈值的自适应迭代确定算法,同时改进了阈值的量化函数。仿真对比试验和应用测试结果表明,该算法具有较好的降噪效果,适用于机动车辆的相关信号检测与降噪。     

An interactive procedure for selecting acceptable alternatives in the presence of multiple criteria

In this paper, we consider the multiple criteria decision‐making problem of partitioning alternatives into acceptable and unacceptable sets. We develop interactive procedures for the cases when the underlying utility function of the decision maker is linear, quasiconcave, and general monotone. We present an application of the procedures to the problem of admitting students to the master's degree program at the Industrial Engineering Department, Middle East Technical University. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 592–606, 2001.     

离散搜索力的最优配置模型及增量搜索计划

目前,离散搜索正越来越普遍地应用于各种搜索实践。为了优化搜索过程,提高离散搜索的效率,应用最优搜索理论,导出了待搜目标服从均匀分布、正态分布时离散搜索力的最优配置模型、目标的踪迹预测方法和最优增量搜索计划的求法,并通过实例作了演示,上述结论和方法为离散搜索力如何实施最优搜索提供了一定的理论依据。     

Effect of bending temperatures on the microstructure and springback of a TRIP steel sheet

Transformation-induced plasticity (TRIP) steel possesses high strength and formability, enabling the use of a thinner gauge material and allowing for the fabrication of complex shapes. In this research, we measured the effect of bending temperatures on the microstructure and air-bending springback angle of TRIP steel at temperatures from 25 to 600 °C. Real-time in situ X-ray diffraction and scanning electron microscopy were used for pre- and postbending analysis. As the prebending temperature increased from 25 °C to 600 °C, the retained austenite (RA) volume fraction decreased, and the RA transformed to bainite at temperatures above 400 °C. The springback angle was positively correlated with the prebending RA volume fraction, with the smallest springback angle achieved at 400 °C. Additionally, the springback angle was positively correlated with the bending angle, because the RA transformation ratio contributed to increased strain hardening. Further microstructure analysis revealed that the RA became elongated in the tension direction as the bending temperatures increased.     

基于军民融合的军事信息资源效能转化

军事信息资源效能转化的强弱,事关军队信息化建设和军队战斗力生成,需要引起高度重视。本文阐述军民融合对军事信息效能转化工作的巨大推动力,并通过分析当前制约军民融合军事信息资源效能转化的内因和外因,提出完善军民融合军事信息资源效能转化工作的措施建议。     

加强海防部队信息化建设

陆军海防部队是新型陆军的重要组成部分。军队规模结构和力量编成调整改革后,海防部队进行了全面整体重塑。海防部队信息化建设矛盾仍存在规划建设多元、装备相对滞后等问题。信息化建设应立足海防部队"岸岛海衔接、侦攻防一体"要求,尽快解决薄弱问题,加速推进向信息化、智能化海防转型发展。     

某高炮数字指挥仪的改造

为了使某高炮数字指挥仪能够适应现代战争的需要,遵照中央军委关于"要用高新技术改造现役装备"的指示,在不降低原高炮数字指挥仪战术技术性能的基础上,加装了红外热像仪、激光测距机、激光距离转换计算机、雷达诸元转换计算机.使该装备不仅能够与部队现配置的雷达连接使用,还增加了目标探测手段,增强了夜间作战能力,提高了装备的性能,成为新一代的光电防空火控系统,适应现代战争的要求.