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介绍了基于虚拟仪器的通信设备自动测试系统设计思路及方法, 给出了此类自动测试系统的硬件平台,重点介绍了虚拟仪器在自动测试系统中的应用以及对通信设备自动测试的软件体系结构设计。 相似文献
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在对网络化校准技术深入研究的过程中,对网络化校准系统体系结构与构建、系统应用软件设计等关键技术进行了研究,以此为基础设计了一个网络化示波器校准系统并进行了实际测试分析。 相似文献
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低频超宽带合成孔径雷达(Ultra Wide Band Synthetic Aperture Radar,UWBSAR)的辐射校准是系统研制和应用过程中必须面对的课题。低频UWBSAR的特点使得常规SAR辐射校准技术不再适用。充分考虑校准参数随频率和方位角的变化,给出适合该系统的辐射校准方法,得到低频UWBSAR图像辐射校准模型。利用该模型,对系统辐射校准误差进行了分析。 相似文献
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虚拟仪器测试系统简介 总被引:3,自引:0,他引:3
本文介绍了虚拟仪器的结构和特点,通过对PCI、PCI、VXI三种不同总线主要性能的比较,指出了基于三种不同总线的虚拟仪器测试系统的特点及应用范围。 相似文献
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针对加速度计安装方向和位置向量补偿的问题,理论上推导了一种六加速度计无陀螺惯性导航系统安装误差校准方法,通过重力效应进行加速度计方向向量的校准,通过载体旋转产生的向心加速度进行位置向量的校准,然后利用校准的结果进行加速度计输出补偿,并进行了计算机数字仿真。仿真结果表明,经加速度计安装校准和补偿,系统精度可提高600倍以上,验证了该方法的有效性。 相似文献
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介绍了一种新型辐亮度校准系统,通过溯源至国家辐照度标准,构建了军用光辐射校准平台。对系统的测量不确定度分析表明,该系统可以满足装备计量保障对测试不确定度比的通用要求,适用于装备专用检测设备的辐亮度校准。 相似文献
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AbstractThis paper examines the impact of civil war on military expenditure. We employ two measures of military expenditure: the share of military expenditure in general government expenditure and the logarithm of military expenditures. We would reasonably expect a priori that military expenditure as a share of general government expenditure increases during a civil war and that such increases would taper off over the duration of a civil war. We also explore whether the termination of a civil war induces a decline in the share of military expenditure as a share of the general government expenditure in the short-run. We find evidence the of share of military expenditure increases during a civil war and falls in the year succeeding the end of a civil war, and, in particular, if a war ends in a peace treaty. The level of military expenditures, however, rises during civil wars and does not appear to decline in the short-term after the end of a civil war. 相似文献
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就树视图与数据库的结合实现树视图的无级动态维护提出了一种解决方法 ,进而拓展了树视图的功能 ,使其能够得到更多的使用。 相似文献
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王兴波 《国防科技大学学报》1995,17(4):136-142
利用插入节点的算法,本文研究了B—样条曲线的形状,得到了B—样条曲线拐点的一个定理。该定理描述了当控制多边形只有一个拐向点时B—样条曲线的拐点、尖点和二重点的关系。此项研究对于工程应用中的CAD有较实际的指导作用。 相似文献
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We study the supplier relationship choice for a buyer that invests in transferable capacity operated by a supplier. With a long‐term relationship, the buyer commits to source from a supplier over a long period of time. With a short‐term relationship, the buyer leaves open the option of switching to a new supplier in the future. The buyer has incomplete information about a supplies efficiency, and thus uses auctions to select suppliers and determine the contracts. In addition, the buyer faces uncertain demand for the product. A long‐term relationship may be beneficial for the buyer because it motivates more aggressive bidding at the beginning, resulting a lower initial price. A short‐term relationship may be advantageous because it allows switching, with capacity transfer at some cost, to a more efficient supplier in the future. We find that there exists a critical level of the switching cost above which a long‐term relationship is better for the buyer than a short‐term relationship. In addition, this critical switching cost decreases with demand uncertainty, implying a long‐term relationship is more favorable for a buyer facing volatile demand. Finally, we find that in a long‐term relationship, capacity can be either higher or lower than in a short‐term relationship. © 2009 Wiley Periodicals, Inc. Naval Research Logistics 2009 相似文献
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冯文敏 《中国人民武装警察部队学院学报》2011,27(3):93-96
摘要是从论文中提炼出来的语义完整的概括文章主旨的紧缩性短语的短文;关键词是从报告、论文中选取出来的,用以表示全文主题内容信息的词或词组。摘要、关键词是文献检索的重要标识,具有窥一斑而见全豹的作用。读者只要浏览摘要及关键词,便可了解文章大意,决定是否阅读全文。二者都是为文献检索提供信息或直接为某些文章所转摘。所以,应按照规范要求,把握摘要四要素,认真撰写摘要,准确选取关键词。将文献信息全面、准确、清晰地提供给读者,提高文献转摘率和被引用率。 相似文献
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周承顺 《中国人民武装警察部队学院学报》2005,21(1):11-13
期刊的传统风格特色是创办品牌、名牌期刊的基础,是其构成要素的一部分。要将期刊办成品牌期刊、名牌期刊,就必须把它过去的风格特色继承下来、传承下去,这是实施精品战略,锻造品牌期刊的基础和前提。论述了品牌期刊的价值构成及要素,并对如何培育锻造品牌期刊作了一些有益的探讨。 相似文献
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This article concerns scheduling policies in a surveillance system aimed at detecting a terrorist attack in time. Terrorist suspects arriving at a public area are subject to continuous monitoring, while a surveillance team takes their biometric signatures and compares them with records stored in a terrorist database. Because the surveillance team can screen only one terrorist suspect at a time, the team faces a dynamic scheduling problem among the suspects. We build a model consisting of an M/G/1 queue with two types of customers—red and white—to study this problem. Both types of customers are impatient but the reneging time distributions are different. The server only receives a reward by serving a red customer and can use the time a customer has spent in the queue to deduce its likely type. In a few special cases, a simple service rule—such as first‐come‐first‐serve—is optimal. We explain why the problem is in general difficult and we develop a heuristic policy motivated by the fact that terrorist attacks tend to be rare events. © 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2009 相似文献
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侯遵泽 《中国人民武装警察部队学院学报》2008,24(8):7-11
在城市地震发生后,火灾往往是最危险的。因此,进行地震火灾危险性分析十分重要。分析了地震火灾产生的原因及其影响因素,提出了地震火灾灾度概念和城市地震火灾危险性分析的模型,建立了城市居民区地震火灾风险评价体系。研究结果可以给城市居民小区地震火灾风险评估提供一套理论模型,用以评价未来某一城市的地震火灾风险。 相似文献
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Anders Corr 《The Nonproliferation Review》2013,20(1):127-147
Nuclear proliferation, lax security standards in the storage of fissile materials, and international apathy in the prosecution of terrorists make nuclear terror a serious threat to the United States and its allies, yet no doctrine of retaliation has been established. To decrease the probability of terrorist use of nuclear weapons, a doctrine of retaliation—a negligence doctrine—should be considered. If the United States can distinguish whose fissile material was used for a nuclear terror event, a negligence doctrine would prescribe retaliation against that state. Where the proximate cause—terrorists—is unavailable for deterrent retaliation, deterring an accessible mediate cause—a state that has failed to adequately secure its fissile material—is one of a few effective alternatives. In the absence of such a negligence doctrine, the United States and its allies are increasingly vulnerable to a nuclear terror attack and the ensuing negative consequences. 相似文献
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Olivier Chopin 《战略研究杂志》2017,40(4):532-553
ABSTRACTThis article argues that the intelligence sector is a privileged vantage point to observe and analyse a transformation of the State in France, as this transformation deeply affects the heart of the executive power and the French intelligence and security apparatus. Traditionally, intelligence was not conceived in France as a functional tool in the hands of the decision-maker but was rather defined as a ‘regalian power’. Intelligence activities were derived from a very specific conception of the State, and especially the particular notion of ‘reason of State’ (raison d’État). The current intelligence reform prompts speculation as to whether it represents more than a ‘simple’ functional reorganisation or in fact could signify that intelligence is now recognised as a tool in the hands of a ‘État de droit’ (‘liberal state’). The idea of a French ‘exceptionalism’ is addressed through a theoretical approach of the way France redefines intelligence and surveillance in relation with a major evolution of the notion of ‘reason of State’ itself. Then the article illustrates the assumption of a ‘lost tradition’ of reason of State through an analysis of the current reform of the intelligence sector in France. This reform is based on processes of rationalisation, centralization, modernisation and normalisation of both intelligence activities and intelligence services in France. As a conclusion, the article addresses the reactions to the January and November 2015 terrorist attacks in Paris, and asks whether resilience towards terrorism requires to accelerate the pace of the transformation of the French intelligence sector. 相似文献