钢筋混凝土外粘钢板结构裂缝的有限元数值模拟

随着高技术武器的不断发展,防护工程正面临着前所未有的威胁和挑战,新型防护结构及材料已经成为研究的热点。针对这一实际背景,运用ANSYS大型有限元软件,采用数值模拟的方法对普通钢筋混凝土结构和外粘钢板混凝土结构在相同均布面荷载作用下的变形、钢筋应力以及结构裂缝的开展情况进行了比较。结果表明外粘钢板的钢筋混凝土结构能够大大增强结构的抗力,并且有效的抑制了裂缝的开展。     

面向对象仿真方法框架研究

提出了面向对象仿真方法框架 ,详细说明了它的概念和基本结构 ,通过对某型防空导弹制导控制系统的仿真研究 ,证明了它的合理性和在系统仿真研究中的重要性     

军校学员身体素质现状分析

对指挥院校和技术院校及其不同年级、不同层次学员的主要身体素质进行了测试和分析 ,并将军校学员与部队战士的身体素质进行了比较。     

Birth of a norm champion: how South Africa came to support the NPT’s indefinite extension

In 1995, South Africa was in a special position. It was: a new party to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), the first country to voluntarily renounce nuclear weapons, led by a charismatic leader, and seen as a champion of disarmament principles. Yet South Africa’s new leaders were also interested in affirming their position within the Non-Aligned Movement, which was adamantly opposed to the NPT’s indefinite extension. Why, then, did South Africa decide to support the indefinite extension of the NPT in 1995? Existing scholarship has ascribed too much credit to pressure from the United States, overlooking domestic debates in South Africa and the bifurcation between professional diplomats and political elites. This article, building on new archival sources and in-depth oral-history interviews with major actors, demonstrates that South African diplomats opposed indefinite extension while South African policy elites allocated little attention to the topic until late in the game. The findings contribute to our understanding of South Africa’s norm entrepreneurship, as well as the politics of global nonproliferation.     

两栖重型合成旅登陆作战后勤保障

两栖重型合成旅是登陆作战的拳头力量,其后勤保障能力的强弱对战斗力生成至关重要,必须认清两栖重型合成旅登陆作战的地位作用、保障原则和要求,构建与信息化条件下登陆作战相适应的精确保障模式,准确把握登陆作战各阶段的保障重心,确保两栖重型合成旅登陆作战后勤保障顺利实施。     

弹(箭)体级间连接结构准静载失效实验与数值预示

级间螺栓法兰连接是导弹(火箭)常见的连接方式,但破坏了整体结构连续性,且承载能力薄弱,在外荷载作用下易发生失效而使整弹(箭)结构强度丧失。根据实际导弹(火箭)连接结构特点,简化设计并制作了一组原理性实验件,设计了准静载加载实验测试系统和螺栓响应信号传感器,进行了两次准静载失效实验,并利用ABAQUS软件建立了对应的有限元仿真模型。根据实验效果和实测数据,分析了连接结构在准静载荷载作用下的失效机理,并对比验证发现有限元模型数值模拟效果和精度与实验吻合较好。研究结论可为弹(箭)体级间连接结构承载能力和失效实验设计提供参考。     

Stochastic production capacity: A bane or a boon for quick response supply chains?

The quick response (QR) system that can cope with demand volatility by shortening lead time has been well studied in the literature. Much of the existing literature assumes implicitly or explicitly that the manufacturers under QR can always meet the demand because the production capacity is always sufficient. However, when the order comes with a short lead time under QR, availability of the manufacturer's production capacity is not guaranteed. This motivates us to explore QR in supply chains with stochastic production capacity. Specifically, we study QR in a two-echelon supply chain with Bayesian demand information updating. We consider the situation where the manufacturer's production capacity under QR is uncertain. We first explore how stochastic production capacity affects supply chain decisions and QR implementation. We then incorporate the manufacturer's ability to expand capacity into the model. We explore how the manufacturer determines the optimal capacity expansion decision, and the value of such an ability to the supply chain and its agents. Finally, we extend the model to the two-stage two-ordering case and derive the optimal ordering policy by dynamic programming. We compare the single-ordering and two-ordering cases to generate additional managerial insights about how ordering flexibility affects QR when production capacity is stochastic. We also explore the transparent supply chain and find that our main results still hold.     

装备试验与评价的系统工程管理技术

试验与评价是对装备战技指标进行的全面考核与验证,涉及到多指标、多阶段、多装备层次。结合装备试验与评价的特点与需求,给出了装备试验与评价系统工程管理的概念,明确了其内涵。从寿命周期维、评价指标维和装备层次维三个角度,构建了装备试验与评价的霍尔三维结构模型(HMTE)。针对具体评价指标,对该模型的矩阵映射过程进行了阐述,实现了HMTE的具体化。最后对元模型进行了论述,并通过案例阐述了其具体形式。装备试验与评价系统工程管理方法的应用,有利于装备试验与评价的全面统筹与实施,达到降低试验总费用,提升试验总效能的目标。     

【邀请论文】美军未来司令部探析——成立背景、主要职能与未来前景

新一轮科技革命的快速发展正推动战争形态从信息化向智能化演进。美军作为二战后始终位列世界第一的军事力量,正在积极设计未来战争以应对当前的“大国竞争”,2018年刚刚成立的陆军未来司令部正是在这一背景下产生的。未来司令部隶属于美国陆军,主要负责美陆军新型武器装备的研发、未来作战概念创新以及新兴军事科技的测试和应用。成立两年以来,未来司令部已经拥有了一套完善、严密的组织架构,创造了包括C5ISR作战概念在内的一系列理论成果,在空基导弹、远程精确火力系统等新型作战装备上也取得了众多进展。本文基于大量前沿文献研究,廓清了未来司令部的组织架构,总结了其主要职能,并对这一新设司令部的发展前景进行了展望和预测,期望能够为推进军队现代化和未来化建设提供有益启示。     

二维矩阵卷积在向量处理器中的设计与实现

为了加快卷积神经网络模型的计算速度,便于大规模神经网络模型在嵌入式微处理器中的实现,以FT-matrix2000向量处理器体系结构为研究背景,通过对多核向量处理器体系结构的分析和对卷积神经网络算法的深入研究,提出将规模较小的卷积核数据置于标量存储体,尺寸较大的卷积矩阵置于向量存储体的数据布局方案。针对矩阵卷积中数据难以复用的问题,提出根据卷积核移动步长的不同动态可配置的混洗模式,通过对所取卷积矩阵元素进行不同的移位操作,进而大幅提高卷积矩阵数据的复用率。针对二维矩阵卷积由于存在数据相关性进而难以多核并行的问题,提出将卷积矩阵多核共享,卷积核矩阵多核独享的多核并行方案。设计了卷积核尺寸不变、卷积矩阵规模变化和卷积矩阵尺寸不变、卷积核规模变化的两种计算方式,并在主流CPU、GPU、TI6678、FT-matrix2000平台进行了性能对比与分析。实验结果表明:FT-matrix2000相比CPU最高可加速238倍,相比TI6678可加速21倍,相比GPU可加速663 805倍。