基于 SBM的操作级并行处理算法研究

SBM是支持操作级并行的一种有效的同步机制。文中基于SBM对结点调度和barrier插入算法进行了深入的研究,提出了一套有效的开发操作级并行的方案。用一有向图G(N,A)表示指令之间的相关关系,并以结点的临界路径为关键字将结点从小到大进行排序。按照排序后的结点顺序,描述了一种分配算法,将结点分配给各处理机。同时,描述了相关结点之间的barrier插入算法。     

登月舱制动段最优机动中的状态跟踪

本文根据登月舱的运动方程,在固定推力条件下,给出最优推力方向。在最优推力方向上对摄动方程加入自适应调节控制,得到状态跟踪的稳定性,使受控系统的输出跟踪状态精度得到保证。     

zn及Zn／Si02复合添加剂的摩擦学性能

实验室自制了锂基润滑脂,通过四球试验研究zn作为锂基润滑脂添加剂在不同工况条件的摩擦学性能,利用光学显微镜和EDX分析了磨斑表面形貌及元素组成,探讨了zn的润滑作用机理,并对zn与SiO2不同复配方案的摩擦学性能进行了研究。结果表明：在低载荷条件,zn能更显著地提高锂基润滑脂的抗磨性能;在中高载荷条件,zn同时具有减摩抗磨性能,但对Pn值的提高没有太大帮助。EDX能谱分析表明磨斑表面存在特征zn元素,说明zn能够在摩擦表面沉积,形成摩擦学性能显著的表面润滑层;同时,zn与硬质颗粒SiO2在适宜的复配比例时具有一定的协同效应,能提高锂基润滑脂的摩擦学性能．     

预应力作用超磁致伸缩材料磁滞回线的温度敏感性分析

超磁致伸缩材料Terfenol-D具有应力温度敏感特性。通过循环油浴加热的实验方法,测量超磁致伸缩材料在力热磁耦合下的磁滞回线,发现预应力的增加有效降低了温度对材料低磁场性能的影响,材料显示了良好的低磁场温度稳定性能。试件在高预应力120 MPa、磁场强度300 kA/m的条件,磁化强度出现先增大后减小的现象,磁化衰减幅度得到减弱。     

基于能量均衡的无线传感器网络生命周期延长策略

为了从能量均衡角度出发解决无线传感器网络生命周期延长问题,从而延长整个物联网生命周期,针对无线传感器网络节点遭遇"路由空洞"的时候出现路由中断和生命周期缩短现象,分析能量消耗原理,构建最优跳数模型和能量均衡协议,并提出采用能量均衡的思路减少节点能量消耗。实验仿真发现,应用能量均衡协议使无线传感器网络节点能量分布更加均匀,节点能量消耗时间明显变长,而个别节点能量消耗速度明显大于其他节点的情况得以减少,达到延长无线传感器网络生命周期的目的。仿真结果验证了该方法的可行性。     

基于PEPA的目标选择方法

目标选择是军事作战领域的重要内容,而一体化联合作战更是要求目标选择从系统的角度出发,对指控系统进行破击目标选择。基于反映系统动态特性和消减主观因素的考虑,本文将过程代数的思想引入到指控系统破击目标选择领域中来。通过案例,对某防空指控系统进行简要分析,在硬杀伤和资源约束的条件下,进行目标方案选择的分析,过程简洁、结论客观、方案可行,证实了该方法的有效性,为指挥决策提供了借鉴和帮助。     

Does Health Spending Crowd out Defense in the United States? Evidence from Wavelet Multiresolution Analysis

Abstract

This study investigates the association between defense and health spending using multi-resolution analysis incorporating the structural change model. Our empirical results suggested that a negative correlation between defense and health spending persists over the entire period of 1941–2013 in the very long-run (over 16 years cycle), but there is a change in correlation between defense and health spending in the short-run (2–4 years cycle), medium-run (4–8 years cycle), and long-run (8–16 years cycle) during the same period. In particular, there appears to have been a trade-off relationship between defense and health spending during the ex-Korean War period, but there was a complementary relationship between defense and health spending during the post-Korean War period. The crowding-out effect of health spending on defense spending during the period when the Affordable Care Act was put into effect relies on the strength of the positive correlation in the long-run (8–16 years cycle) and negative correlation in the short-run (2–4 years cycle) and very long-run (over 16 years cycle).     

Cost allocation of capacity investment games

Consider a manufacturer serving a set of retail stores each of which faces deterministic demands in a finite planning horizon. At the beginning of the planning horizon, the production capacity of the manufacturer is built, followed by production, outsourcing to third party manufacturers if necessary and distribution to the retail stores. Because the retail stores are usually managed by different managers who act as independent profit centers, it is desirable that the total cost is divided among the retail stores so that their incentives can be appropriately captured and thus efficient operations can be achieved. Under various conditions, we prove that there is a fair allocation of costs among the retail stores in the sense that no subset of retail stores subsidizes others, or equivalently, the resulting capacity investment game has a nonempty core, that is, the capacity investment game is a balanced game. In addition, our proof provides a mechanism to compute a fair cost allocation. © 2013 Wiley Periodicals, Inc. Naval Research Logistics 60: 512–523, 2013     

一种基于节点资源利用率的无标度网络路由策略

本文研究了节点负载处理能力异质条件下的无标度网络交通动力学过程,提出了一种基于节点资源利用率的全局动态路由策略。该策略利用网络中节点资源利用率构建了一种全局代价函数,选择使该代价函数最小的路径来传输负载。实验结果表明该路由策略在略微增加平均路径长度的情况下成倍地提高了网络负载传输能力,与有效路由策略的比较进一步验证了该策略的有效性。