复合铝基润滑脂制备与性能

复合铝基润滑脂是性能优良的多效润滑脂,尤其是泵送性能良好,适用于集中润滑系统,已在冶金等行业获得广泛应用。考察了组成、工艺和添加剂对复合铝基润滑脂性能的影响,复合铝皂对环烷基油的稠化能力优于对石蜡基油的稠化能力,增大基础油黏度有利于改善润滑脂的性能,采用异丙醇铝三聚物比采用异丙醇铝制备复合铝基润滑脂的工艺可靠,产品性能更稳定。通过配方和工艺条件优化,制备的复合铝基润滑脂具有高滴点,良好的胶体安定性、机械安定性、氧化安定性、抗水性、防腐性和抗磨性。     

基于C3D辅助的战场传感器监视系统设计与实现

首先介绍了战场传感器监视系统的定义和各国现有典型系统。其次针对战场监视特殊的应用环境,利用C3D辅助技术,将相对定位与基于三维地图环境下的绝对定位相结合,通过坐标转换和地图匹配将位置信息直观准确反映在电子地图上,设计了基于C3D辅助的战场传感器监视系统,并对该系统进行了实现。最后通过对3D-MDS(C,D)定位算法的验证结果表明,在长1000m×7m宽的道路上,布撒120个节点,对于速度为3m/s的装甲车定位误差仅为2.1687米。该系统可对定位算法的定位精度进行评测及误差进行修正,防止由于误差累积造成误差放大。     

k-ary n-cube中的移动气泡流控策略

在k-ary n-cube网络中,气泡流控是一种有效、实用的死锁避免技术,它不必依赖虚通道就能避免环网中出现的死锁问题。如果流控策略能感知到维度内缓冲区的总体使用情况,就能够更加高效地进行调度,从而提高网络性能。为了避免关键气泡机制引起的阻塞,提出了伪报文协议;结合伪报文协议,设计了移动气泡流控策略,它有效实现了维度内的全局资源感知能力。与局部气泡流控相比,路由器每条输入通道仅设置一个报文缓冲区就可以避免环网中的死锁,即最小资源需求减少了一半。网络模拟结果表明,该机制不会出现永久阻塞;在distribute、hotregion和uniform传输模式中,该机制可以有效提高网络吞吐率20%以上,并且在网络饱和后吞吐率依然维持稳定。     

双预测结构融合的复杂红外图像背景抑制算法

针对复杂红外图像的背景抑制问题,提出了一种双预测结构融合的复杂红外图像背景抑制算法.算法以图像中每个像素为中心,在其局部区域内根据灰度相似程度和空间分布相关性计算像素的核值相似程度,然后根据核值相似程度有侧重地融合两种不同结构的空间滤波器的输出作为最终的预测结果,最后将原始图像与预测图像相减完成背景抑制.实验结果表明,本文提出的算法能够较好地抑制不同红外图像中的复杂背景,算法结构简单,具有较强的应用价值.     

基于特征融合的刀具磨损监测方法

提出了一种基于特征融合的刀具磨损监测方法,将该方法应用于铣刀磨损监测取得了较好的效果,文中论述了特征融合方法的基本思想,多传感器信号的特征关联、抽取及正规化处理,作为融合中心的神经网络的构造及训练等内容。实验分析表明,该方法实现刀具磨损监测是行之有效的。     

Formulations for dynamic lot sizing with service levels

In this article, we study deterministic dynamic lot‐sizing problems with a service‐level constraint on the total number of periods in which backlogs can occur over a finite planning horizon. We give a natural mixed integer programming formulation for the single item problem (LS‐SL‐I) and study the structure of its solution. We show that an optimal solution to this problem can be found in \begin{align*}\mathcal O(n^2\kappa)\end{align*} time, where n is the planning horizon and \begin{align*}\kappa=\mathcal O(n)\end{align*} is the maximum number of periods in which demand can be backlogged. Using the proposed shortest path algorithms, we develop alternative tight extended formulations for LS‐SL‐I and one of its relaxations, which we refer to as uncapacitated lot sizing with setups for stocks and backlogs. {We show that this relaxation also appears as a substructure in a lot‐sizing problem which limits the total amount of a period's demand met from a later period, across all periods.} We report computational results that compare the natural and extended formulations on multi‐item service‐level constrained instances. © 2013 Wiley Periodicals, Inc. Naval Research Logistics, 2013     

用于目标跟踪无线传感器网络的动态分簇算法

针对跟踪精度和网络能耗的问题,提出了一种用于目标跟踪无线传感器网络的基于预测的动态分簇算法.把目标运动过程看作是高斯马尔可夫过程,根据目标历史轨迹,估计下一时刻位置坐标和运动速度,然后基于估计结果优化选择分簇的簇头和簇成员,形成一个动态分簇来实现目标跟踪.仿真结果表明:该算法使目标跟踪有较好的跟踪精度,能有效均衡网络能耗,延长网络寿命.     

NSHT预警装备体系网络化建模与分析

针对NSHT的运动特性和NSHT预警装备网络化趋势,对NSHT情报的分布式碎片化的特点进行了分析,设计了装备体系节点间的信息流向。在此基础上,提出了基于复杂网络理论的NSHT预警装备体系网络模型,并对网络模型的拓扑结构、统计特征等进行了研究,提出了NSHT预警装备体系连接结构的设计建议和应用思路。     

UNCLOS and maritime security: the “securitisation” of the South China Sea disputes

This Critical Comment seeks to situate the United Nations Convention on the Law of the Sea (UNCLOS) within the context of South China Sea (SCS) dispute. Bearing in mind that maritime actions of the main disputants – China, Vietnam, and the Philippines – increasingly “securitise” these long-standing disputes and vice versa, the study examines the concept of a maritime “regime complex.” Whereas efforts have being made to examine UNCLOS and indeed the dispute within the framework of a maritime “regime complex,” the key finding shows that the increased “securitisation” of the disputes makes it difficult to envisage effective engagement of UNCLOS as a resolution mechanism. It will also reveal that China's firmly established expansionist agenda in the SCS region is indicative of Beijing's susceptibility to compromise a diplomatic solution to these long-standing disputes. These discoveries are structured around the knowledge that the spatial relation of the SCS critically espouses not only its geo-strategic significance in terms of natural resources endowment, but also the enduring maritime disputes within the region.     

FINANCIAL VERSUS HUMAN RESOURCES IN THE GREEK–TURKISH ARMS RACE 10 YEARS ON: A FORECASTING INVESTIGATION USING ARTIFICIAL NEURAL NETWORKS

This paper looks into the Greek–Turkish arms race a decade after an earlier contribution to the issue that relied heavily on artificial neural networks. The time period between the two papers contributes to the reliability of the results derived, not just by increasing the number of observations, but also mainly by incorporating the progress made in the realm of artificial intelligence. The focus on the case of both countries unlike the paper mentioned above that dealt with just the Greek side provides ample room for comparative purposes regarding the determinants of defense expenditure on both sides. The results derived in terms of input significance estimation support the findings of the earlier research as indicated above, pointing to the leading role of the demographic preponderance of Turkey over Greece. The paper also points to the fact that 10 years later, Turkey continues to set the arms race rules against its rival by determining the defense expenditure of Greece, whereas the role of the latter in affecting the military spending of Turkey is non‐existent.