一类非线性时滞双曲型偏微分方程的振动性

研究一类非线性时滞双曲型偏泛函微分方程解的振动性,利用微分不等式方法和广义Riccati变换,获得了该类方程在第一类边值条件下振动的新的充分条件,所得结果通过实例加以阐明.     

DEFENSE SPENDING AND ECONOMIC GROWTH IN TURKEY: A LINEAR AND NON‐LINEAR GRANGER CAUSALITY APPROACH

This paper uses linear and non‐linear Granger causality methods to determine the causal relationship between defense spending and economic growth in Turkey for the period 1949–2004. The innovative feature of this paper is that it provides evidence regarding the nonlinear causal dependence between military spending and economic growth in Turkey. The empirical results contribute to the empirical literature by indicating support for both linear and non‐linear causality between military expenditures and economic development and they may prove useful in theoretical and empirical research by regulators and policy makers.     

基于TRIZ的陆军装备保障转型活动生成研究

TRIZ是一种通过解决冲突来解决发明问题的理论,具有系统性、科学性和创新性相统一的特点．通过建立陆军装备保障目标能力参数体系,分析目标能力提升中存在的冲突情况并加以解决,建立了基于TRIZ的陆军装备保障转型活动生成方法,以期有效解决装备保障转型活动生成的关键难题．     

基于ANP的装备保障转型影响因素分析

针对装备保障转型影响因素众多、转型重要程度难以确定等问题,分析了保障转型外部和内部影响因素,建立了保障转型影响因素ANP模型,利用ANP方法对装备保障转型影响因素进行了权重确定,为确定装备保障转型影响因素重要性程度提供了一种定量化分析方法,明确了装备保障转型应优先重点解决的关键问题．     

基于时滞分割法的具有leakage项时滞的离散型神经网络状态估计

摘要：研究一类具有leakage时滞的离散型神经网络的状态估计问题．通过构造新的Lyapunov泛函得到保证估计误差全局渐近稳定的充分条件,并通过求解一个线性矩阵不等式（LMI）得到状态估计器的增益矩阵．采用一种新的时滞分割方法将变时滞区间分割为多个子区间,使该结果在获得更小的保守性同时也降低了计算的复杂度．     

基于GDOP的多基地雷达布站优化研究

以BLUE算法和GDOP为基本定位算法和精度分析工具,评估多基地雷达的定位性能,建立以GDOP最小值最小和有效监控区最大为目标的多基地雷达布站优化模型.仿真结果表明,通过以下措施可提高定位性能:①增加收发站总数;②采取扇形方式布站;③优先增加部署接收站;④交替部署收发站;⑤通过优化模型优化扇形布站分布角总和.     

Formation of adiabatic shearing band for high-strength Ti-5553 alloy: A dramatic thermoplastic microstructural evolution

By using split Hopkinson pressure bar, optical microscopy and electronic microscopy, we investigate the influence of initial microstructures on the adiabatic shear behavior of high-strength Ti–5Al–5V–5Mo–3Cr (Ti-5553) alloy with lamellar microstructure and bimodal microstructure. Lamellar alloy tends to form adiabatic shearing band (ASB) at low compression strain, while bimodal alloy is considerably ASB-resistant. Comparing with the initial microstructure of Ti-5553 alloy, we find that the microstructure of the ASB changes dramatically. Adiabatic shear of lamellar Ti-5553 alloy not only results in the formation of recrystallized β nano-grains within the ASB, but also leads to the chemical redistribution of the alloying elements such as Al, V, Cr and Mo. As a result, the alloying elements distribute evenly in the ASB. In contrast, the dramatic adiabatic shear of bimodal alloy might give rise to the complete lamination of the globular primary α grain and the equiaxial prior β grain, which is accompanied by the dynamic recrystallization of α lamellae and β lamellae. As a result, ASB of bimodal alloy is composed of α/β nano-multilayers. Chemical redistribution does not occur in ASB of bimodal alloy. Bimodal Ti-5553 alloy should be a promising candidate for high performance armors with high mass efficiency due to the processes high dynamic flow stress and excellent ASB-resistance.     

A branch and bound algorithm for the minimum storage‐time sequencing problem

The minimum storage‐time sequencing problem generalizes many well‐known problems in combinatorial optimization, such as the directed linear arrangement and the problem of minimizing the weighted sum of completion times, subject to precedence constraints on a single processor. In this paper we propose a new lower bound, based on a Lagrangian relaxation, which can be computed very efficiently. To improve upon this lower bound, we employ a bundle optimization algorithm. We also show that the best bound obtainable by this approach equals the one obtainable from the linear relaxation computed on a formulation whose first Chvàtal closure equals the convex hull of all the integer solutions of the problem. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 313–331, 2001     

计算机人机交互界面的变化与计算机的发展

讨论人机交互界面性质设定变化对计算机发展的影响问题.认为人与计算机是通过一定界面进行信息交流的,而界面是否友好直接关系到计算机的应用及发展.及时改变人机交互界面的性质是计算机发展的关键.     

稳健局部线性嵌入方法

针对局部线性嵌入方法对于噪声的敏感性,从分析噪声对数据集局部特性的影响入手,提出了稳健局部线性嵌入方法。通过与局部线性嵌入方法的理论分析和实例对比,表明稳健局部线性嵌入方法不仅对噪声影响不敏感,而且对邻域的选择有较好的适应性,可更好地挖掘数据集的本征特性,具有更强的数据可视化能力。