全球信息栅格的产生和实现技术研究

介绍了全球信息栅格的概念与定义,详细论述了全球信息栅格产生与发展的动因、实现技术的研究现状.介绍了研究与实现全球信息栅格的关键技术、基础理论,重点论述了实现全球信息栅格总体架构的有关内容.     

基于RUP的航空兵作战C4ISR体系结构研究

本文分析了C4ISR系统的建模特点,对当前主流体系结构模型开发方法进行了比较,提出了运用Rational统一过程（RUP）开发DoDAF体系结构视图产品,并分析了其可行性。结合航空兵作战的特点,采用Rational ROSE建模工具开发了的相关视图产品,描述了航空兵作战过程,证明了RUP对体系结构的开发有着良好的支持作用。     

多核数字信号处理卷积算法并行优化

针对国防科技大学自主研发的异构多核数字信号处理(digital signal processing, DSP)芯片的特征以及卷积算法自身特点,提出了一种面向多核DSP架构的高性能多核并行卷积实现方案。针对1×1卷积提出了特征图级多核并行方案;针对卷积核大于1的卷积提出了窗口级多核并行优化设计,同时提出了逐元素向量化计算的核内并行优化实现。实验结果表明,所提并行优化方法实现单核计算效率最高能达到64.95%,在带宽受限情况下,多核并行扩展效率可达到48.36%～88.52%,在典型网络ResNet50上的执行性能与E5-2640 CPU相比,获得了5.39倍性能加速。     

面向复杂几何模型的多级并行四面体网格生成算法

高性能计算机的快速发展为数值模拟提供了必需的硬件环境,数值模拟领域对网格的需求已高达数十亿到数百亿量级,而网格生成作为数值模拟的重要一环,其发展则相对滞后,很难满足并行数值模拟求解器对大规模网格的需求。本文面向复杂几何模型提出一种多级并行四面体网格生成算法,该算法首先基于模型的几何特征建立网格的尺寸场,并基于尺寸场和几何实体间的邻接关系对几何实体进行分组,将分组后的几何实体分配到不同的计算节点,在计算节点间采用前沿推进法实现三角形面网格的并行生成,然后在计算节点内对三角形面网格进行二级区域分解,将分解后的子网格分配到各进程中,最后在进程内采用多线程并行方法实现四面体网格的并行生成。通过实际应用三峡大坝模型进行验证,该算法具有良好的并行效率和可扩展性,可以在数千处理器核上实现十亿规模高质量四面体网格的并行生成。     

Multi-scale traffic vehicle detection based on faster R-CNN with NAS optimization and feature enrichment

It well known that vehicle detection is an important component of the field of object detection. However, the environment of vehicle detection is particularly sophisticated in practical processes. It is compara-tively difficult to detect vehicles of various scales in traffic scene images, because the vehicles partially obscured by green belts, roadblocks or other vehicles, as well as influence of some low illumination weather. In this paper, we present a model based on Faster R-CNN with NAS optimization and feature enrichment to realize the effective detection of multi-scale vehicle targets in traffic scenes. First, we proposed a Retinex-based image adaptive correction algorithm (RIAC) to enhance the traffic images in the dataset to reduce the influence of shadow and illumination, and improve the image quality. Second, in order to improve the feature expression of the backbone network, we conducted Neural Architecture Search (NAS) on the backbone network used for feature extraction of Faster R-CNN to generate the optimal cross-layer connection to extract multi-layer features more effectively. Third, we used the object Feature Enrichment that combines the multi-layer feature information and the context information of the last layer after cross-layer connection to enrich the information of vehicle targets, and improve the robustness of the model for challenging targets such as small scale and severe occlusion. In the imple-mentation of the model, K-means clustering algorithm was used to select the suitable anchor size for our dataset to improve the convergence speed of the model. Our model has been trained and tested on the UN-DETRAC dataset, and the obtained results indicate that our method has art-of-state detection performance.     

装甲机械化部队信息系统体系结构研究

为确立装甲机械化部队信息系统建设的体系结构,分析了装甲机械化部队信息系统存在的问题,根据装甲机械化部队军事能力需求得出了装甲机械化部队的信息系统的体系结构方案,并就相关问题进行了描述和探讨,可供装甲机械化部队信息系统建设参考。     

L+1容错恢复策略在复杂军事网络中的应用仿真

以标准3×3网格为基础网络,介绍了L+1容错恢复策略的概念和恢复原理,以海上舰艇编队作战系统网络为研究对象,使用Matlab-Simulink仿真工具,通过对阻塞概率、平均路径长度、路径重新分配概率和有效利用率4个指标的仿真,对比了该网络在无策略、备份多路和L+1容错恢复3种策略下网络的恢复程度,验证了L+1容错恢复策略的有效性和可行性。     

A branch‐and‐price algorithm for parallel machine scheduling with time windows and job priorities

This paper presents a branch‐and‐price algorithm for scheduling n jobs on m nonhomogeneous parallel machines with multiple time windows. An additional feature of the problem is that each job falls into one of ρ priority classes and may require two operations. The objective is to maximize the weighted number of jobs scheduled, where a job in a higher priority class has “infinitely” more weight or value than a job in a lower priority class. The methodology makes use of a greedy randomized adaptive search procedure (GRASP) to find feasible solutions during implicit enumeration and a two‐cycle elimination heuristic when solving the pricing subproblems. Extensive computational results are presented based on data from an application involving the use of communications relay satellites. Many 100‐job instances that were believed to be beyond the capability of exact methods, were solved within minutes. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

C4ISR体系结构产品设计研究

体系结构产品是C4ISR体系结构框架中定义的体系结构描述形式,因此体系结构产品设计是体系结构设计的关键环节。基于C4ISR体系结构框架,对作战节点连接关系、作战活动模型、系统接口描述等核心体系结构产品进行规范化描述,分析了这些核心体系结构产品的数据相关性,提出了体系结构产品设计的检验方法。     

光学系统的副像及其消除方法的探讨

视准式光学系统瞄准具的成像有主像和副像两种情形,主像是对目标瞄准的必要标志,副像则对目标的瞄准产生不良影响,为消除或减弱光学系统所成的副像对瞄准精度的影响,主要分析了光学系统中中心反射镜的反射和有无平行差时产生副像的原因.提出了消除或减弱副像的多项措施,并针对中心反射镜提出了两种截然相反地改进方法.可有效地消除或减弱副像所引起的不良干扰对飞行人员视觉的影响,有效地提高了观察效果和瞄准精度.