一种针对分布式MIMO雷达的高效干扰功率分配方法

MIMO雷达的种类很多,其中分布式MIMO雷达是具有空间分集特性的一种,具有较强的代表性。针对采用多波束多信号干扰设备干扰分布式MIMO雷达的情况,要考虑针对MIMO雷达各节点干扰功率的分配问题,提出了采用能量集中法进行功率分配。给出分配方法及干扰效果的仿真实验,结果表明在使用相同的干扰功率情况下,所讨论的方法比传统的干扰等比例分配法具有更佳的干扰效果。     

Nuclear deterrence and cyber warfare: coexistence or competition?

Nuclear deterrence and cyber war seem almost antithetical in their respective intellectual pedigrees. Nuclear weapons are unique in their ability to create mass destruction in a short time. Information or “cyber” weapons, at least for the most part, aim at sowing confusion or mass disruption instead of widespread physical destruction. Nevertheless, there are some intersections between cyber and nuclear matters, and these have the potential to become troublesome for the future of nuclear deterrence. For example, cyber attacks might complicate the management of a nuclear crisis. As well, information attacks on command-control and communications systems might lead to a mistaken nuclear launch based on false warnings, to erroneous interpretations of data or to panic on account of feared information blackout. It is not inconceivable that future nuclear strike planning will include a preliminary wave of cyber strikes or at least a more protracted “preparation of the battlefield” by roaming through enemy networks to plant malware or map vulnerabilities.     

Sharp bounds for the reliability of systems and mixtures with ordered components

In this article, we study how to derive bounds for the reliability and the expected lifetime of a coherent system with heterogeneous ordered components. These bounds can be used to compare the performance of the systems obtained by permuting the components at a given system structure, that is, to study where we should place the different components at a system structure to get the most reliable system. Moreover, a similar procedure is applied to get bounds for mixtures and for the generalized proportional hazard rate model when the baseline populations are ordered. © 2017 Wiley Periodicals, Inc. Naval Research Logistics 64: 108–116, 2017     

The role and capabilities of major weapon systems transferred between 1950 and 2010: Empirical examinations of an arms transfer data set

Arms transfers provide exporters an avenue to provide security to other states while gaining economic benefits. Arms transfers provide importers an avenue to gain security without having to rely on alliances. Past research uses aggregate measures of the monetary or security value of major weapon system transfers without accounting for strategic differences in possible use in interstate and civil conflict. This article presents a data set on interstate transfers of major weapon systems between 1950 and 2010 building upon Stockholm Peach Research Institute’s Arms Trade Register with several improvements. First, it disaggregates land weapons and air weapons into categories reflecting their strategic capabilities. Second, model level characteristics (e.g. age, speed, and range) are drawn from Jane’s Defence sources. Additionally, the data set covers a larger range of time and states than previous data sets categorizing arms. To demonstrate the usefulness, this article first presents summary statistics of the data set and then replicates an earlier test to show that the effect of human rights and regime types on United States transfers differs across the categories of arms compared to alternative measures of arms transfers.     

满足线性二次型调节器性能指标的群系统编队跟踪问题优化控制方法

针对群系统编队跟踪问题,提出一种满足线性二次型调节器性能指标的优化控制方法。建立编队跟踪问题的数学描述和设计编队跟踪控制协议。给出群系统实现编队跟踪的充要条件,借助李雅普诺夫第二方法分析系统的稳定性。得到了控制协议能够最小化线性二次型调节器性能指标的拓扑条件,设计了编〖BHDWG8,WK10YQ,DK1*2,WK1*2D〗〖XCWL.TIF;%129%129〗听语音 聊科研与作者互动 队跟踪算法。仿真实验验证了控制方法的有效性。     

Thermal explosion of a reactive gas mixture at constant pressure for non-uniform and uniform temperature systems

In this study, the approximate and exact solutions for the stationary-state of the solids model with neglecting reactant consumption for both non-uniform and uniform temperature systems were applied on gas ignition under a constant pressure condition. The criticality conditions for a slab, an infinite cylinder, and a sphere are determined and discussed using dimensionless temperatures under constant ambient and surface temperatures for a non-uniform temperature system. Exact solution for a Semenov model with convection heat loss was also presented. The solution of the Semenov problem for constant volume or density as a solid and constant pressure were compared. The critical parameter δ is calculated and compared with those of Frank-Kamenetskii solution values. The validation of the calculated ignition temperatures with other exact solution and experimental results were offered. The relation between critical parameters form Semenov and F.K. models solution was introduced.     

分布式储能技术的探索与实践

文章阐述了分布式储能技术的重要意义,介绍了分布式储能技术在经济社会可持续发展重要领域——能源互联网发展中的重要地位,并对分布式储能的技术形态与载体进行了分析,最后以信息网络重要组成部分——数据中心为应用场景,对分布式储能技术的实践进行了探讨。     

适用于云计算的多接收方代理重加密方案

在云计算环境下,绝大多数信息处理和存储都被转移到云中心,用户终端的计算和存储能力将逐渐弱化。本文针对这一趋势,提出一种适用于云计算的多接收方代理重加密方案,充分利用云中心的分布式计算能力,使用随机数重用和密文聚合技术,大大降低了计算和传输负担,实验表明本方案具有较高的效率。     

基于流量均衡和跨层技术的星群路由算法

针对分布式星群网络业务通信QoS不高的问题,提出了一种基于流量均衡和跨层技术的分布式星群网络路由算法(TACA)。该算法首先通过跨层技术将物理层、MAC层的相关信息搜集起来,作为判断链路负载状况的依据;然后对不同类型的业务进行分类,根据链路负载状况和业务QoS级别选择不同的路由层次,从而均衡流量以提高QoS。仿真表明,该路由算法在一定程度上降低了星群的呼叫阻塞率和切换阻塞率,平衡了网络的负载,提高了网络吞吐量。     

ON THE USE OF TERROR WEAPONS VERSUS MODERN WEAPON SYSTEMS IN AN ARMS RACE BETWEEN DEVELOPED AND LESS DEVELOPED COUNTRIES

Some of the most active arms races are taking place between developed and less developed countries. The inability of less developed countries to compete financially, as well as technologically, with developed countries may be forcing the former to acquire terror weapons (TWP). The Iran–Iraq war in the 1980s and the events of 9/11 proved that the use of TWP is no longer a mere threat; there are several organizations and countries that will not hesitate to use them. This study develops a model of resource allocation in an arms race between a developed country that is characterized by state‐of‐the‐art technology and high GDP, and a less developed country whose technological capability and GDP are much lower. The model is used to predict the optimal mix of weapons of the two countries that are engaged in the arms race. Applying the model to the arms race between Israel and Syria demonstrates its use.