分数阶终端滑模控制器在DTC系统中的应用

针对SVPWM调制的永磁同步电机直接转矩控制系统磁链和转矩波动较大的问题,结合非奇异终端滑模和分数阶微积分理论的特点,设计了一种分数阶非奇异终端滑模控制器。结合直接转矩原理和分数阶微积分理论,对误差进行分数阶微分后与误差之和作为滑模面;根据非奇异终端滑模控制原理,在所设计分数阶滑模面的基础上确定了相应的控制律;利用李亚普诺夫定理证明了滑模面的稳定性和可达性。仿真结果表明,该策略能提高系统的动静态性能,可以进一步抑制磁链和转矩波动。     

Bullwhip and reverse bullwhip effects under the rationing game

When an unreliable supplier serves multiple retailers, the retailers may compete with each other by inflating their order quantities in order to obtain their desired allocation from the supplier, a behavior known as the rationing game. We introduce capacity information sharing and a capacity reservation mechanism in the rationing game and show that a Nash equilibrium always exists. Moreover, we provide conditions guaranteeing the existence of the reverse bullwhip effect upstream, a consequence of the disruption caused by the supplier. In contrast, we also provide conditions under which the bullwhip effect does not exist. In addition, we show that a smaller unit reservation payment leads to more bullwhip and reverse bullwhip effects, while a large unit underage cost results in a more severe bullwhip effect. © 2017 Wiley Periodicals, Inc. Naval Research Logistics 64: 203–216, 2017     

Is Britain a force for good? Investigating British citizens’ narrative understanding of war

It is commonly assumed in the foreign policy literature that narratives are uniquely persuasive and thus integral to obtaining public support for war. Yet, empirical research on “strategic narrative” is often vague on both the concept of narrative and how it persuades. Moreover, the stories publics use to interpret war are rarely examined. This paper offers a novel approach to studying “from the ground up” the war stories of individual British citizens. It examines public interpretations of war through emplotment: the way people select and link events to create a coherent story. Examining the wars people include and those they silence, it illustrates how a diverse range of citizens morally evaluates Britain’s military role, be it as a Force for Good, a Force for Ill or a country Learning from its Mistakes. In doing so, the paper offers an alternative methodological approach to studying how individual citizens understand war.     

Homes for heroes? Assessing the impact of the UK’s Military Covenant

The British Military Covenant can be located in and from many sources and from 2011 onwards in primary legislation. This article argues that the provision of military housing amounts to an early test of how the military covenant is understood and used by those involved in defence policy, and those in the armed forces affected by it. It finds that housing was a prominent feature of how service personnel understood how they were valued, but was not explicitly understood as a covenant issue by those personnel or the officials in charge of the Defence Estates. We locate three reasons for this: (1) the covenant has been poorly translated from aspiration into policy practice, (2) the covenant is unevenly understood across its stakeholders which has the effect of generating disappointment through misaligned expectations, (3) those engaged in the reform process surrounding the Defence Infrastructure Organisation (DIO) saw the covenant as a means to energise reform. Ultimately housing was seen as a dry and technocratic business area and thus an issue ripe for being refracted through the covenant was ultimately left outside of its remit.     

Bolstering components for maximizing system lifetime

This article considers the problem of which component should be “bolstered” or “improved” in order to stochastically maximize the lifetime of a parallel system, series system, or in general, k-out-of-n system. Various ways of bolstering including active redundance, standby redundancy, and burn-in are studied. Also the method of reducing working temperature or stress level according to Arrhenius models is investigated. © 1998 John Wiley & Sons, Inc. Naval Research Logistics 45: 497–509, 1998     

海军军事数据在指挥控制中的作用及层次关联分析

信息化条件下的海上作战中,数据的重要性不断凸显,数据建设已成为信息化建设的核心内容之一,加强数据研究愈发重要,因此以海军军事数据为研究对象,论述海军军事数据在指挥控制中的作用、特点,重点以海军水面舰艇作战能力数据为研究对象,对海军军事数据之间的层次关联性进行了分析研究,建立了海军水面舰艇作战能力数据的层次关系模型,为海军军事数据的进一步深入研究打下基础。     

Xunzi on the Role of the Military in a Well-Ordered State

Chapter 15 of the Xunzi stands as the most comprehensive account of the early Confucian analysis of warfare. Unlike a range of other early, non-Confucian discussions on warfare, particular strategies and tactics are taken to be of secondary importance. Thus, Xunzi refuses to discuss practical military strategy without framing it within a much broader ethical, social, and political context. On his account, a well-ordered, flourishing state necessarily rests upon a particular set of rituals and social norms in which people can cultivate themselves morally. Such a state has nothing to fear from any enemy, no matter how tactically sophisticated or militarily skilled. To many, such a view seems overly optimistic. However, given that Xunzi is anything but Pollyannaish in other parts of the text and is quite pessimistic about human nature in general, it behooves us to dig a bit more deeply into his ideas about military affairs and examine whether they can be understood in a more plausible light. This article provides a reading of Xunzi’s views on military affairs that is internally consistent and corresponds with Xunzi’s broader ethical and political views, while also showing why someone of Xunzi’s obvious intellectual acumen might hold such a view.     

高精度CFD程序的内外子区域划分异构并行算法

对计算流体力学(Computational Fluid Dynamics, CFD)程序CNS提出一种Offload模式下对任务内外子区域划分的异构并行算法,结合结构化网格下有限差分计算和四阶龙格-库塔方法的特点,引入ghost网格点区域,设计了一种ghost区域收缩计算策略,显著降低了异构计算资源之间的数据传输开销,负载均衡时CPU端的计算与MPI通信完全和加速器端的计算重叠,提高了异构协同并行性。推导了保证计算正确性的ghost区域的参数,分析了负载均衡的条件。在"CPU(Intel Haswell Xeon E5-2670 12 cores×2)+加速器(Xeon Phi 7120A×2)"的服务器上测得该算法较直接将任务子块整体迁至加速器端计算的异构算法性能平均提升至5.9倍,较MPI/OpenMP两级并行算法使用24个纯CPU核的性能,该算法使用单加速器时加速至1.27倍,使用双加速器加速至1.45倍。讨论和分析了性能瓶颈与存在的问题。     

From Westphalian Failure to Heterarchic Governance in MENA: The Case of Syria

Abstract

The problematic export of the Westphalian system to MENA is examined, taking Syria as exemplar. The export model is juxtaposed to actual non-lineal trajectories, semi-sovereignty and hybrid or failing states. This is manifested in post-uprising Syria in failing statehood, fragmented and overlapping governance, permeable and collapsing borders, the loss of sovereignty to trans-state movements, “competitive regime-building” between the Asad regime and jihadist warlords, and “competitive interventionism” by external powers filling the governance vacuum with their own proxies. The result is heterarchic zones of limited statehood in which state sovereignty is contested by both international (supra-state) penetration and sub-state fragmentation.     

新时代与公共政策的创新

公共政策,既是时代的产物,又为时代服务。新时代要求公共政策的创新必须更加聚焦,一切以调动广大人民群众的积极性,增强民族的凝聚力、创造力为出发点;要求公共政策的创新以人民为中心,一切以人民是否满意,是否具有获得感、幸福感、安全感、自豪感为落脚点;要求公共政策的创新,应当以社会问题为重点,以推动解决主要矛盾、化解社会各领域的主要问题为根本要求;要求公共政策的研究应当提高定位、开阔视野,跟上时代步伐,多出系统性、前瞻性研究成果和高质量研究人才,为党和国家的科学决策贡献更多的智慧力量。