排序方式: 共有113条查询结果,搜索用时 0 毫秒
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互联网的快速发展使得传统的POP组网方式面临巨大的挑战,部署SPR(Single POP Router)路由器被认为是解决问题的有效手段。提出了异构路由器的聚合交换技术,可以将POP中的多个异构路由器以集群的方式实现一个规模更大的SPR路由器,具有降低组网成本、保护现有投资、简化网络管理、提高交换效率等优点。给出了聚合交换技术中需要重点研究的几个关键问题以及研究思路。 相似文献
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提出了一种脉冲群间多普勒频率变化率的高精度测量算法,该算法利用脉冲群内相邻脉冲对间的互相关函数估计脉冲群模糊频率,在连续脉冲群间选择任一相同模糊频率进行解模糊得到各脉冲群相对频率,由于这些相对频率包含相同的模糊,从而可以利用差分或滤波算法得到脉冲群间多普勒频率变化率。该算法具有相对频率估计精度高、解模糊过程简单、运算量小、多普勒频率变化率测量精度高等优点。计算机仿真和地面缩比试验均证明了该测量算法的有效性。 相似文献
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Toshihiro Higuchi 《战略研究杂志》2013,36(1):83-116
The idea of ‘clean’ bombs, nuclear weapons with a reduced amount of radioactive fallout resulting from their fission part, has met much ridicule since its public inauguration in 1956. Many scholars have regarded the bombs as a propaganda tool, stopping short of analyzing their role in the transformative phase of US nuclear strategy in the 1950s. This paper reexamines the clean bomb episode through 1958, shedding light upon the dynamic relationship between the development of nuclear weapons technology and the evolution of nuclear strategy from massive retaliation to flexible response. It also discusses the mechanism and momentum of nuclear weapons technology innovation until the US suspended nuclear testing in late 1958. 相似文献
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为研究子弹圆环内均匀散布的情况子母弹对圆目标的毁伤概率,首先研究子弹散布范围覆盖圆目标的面积,然后用概率分析的方法推导出了子弹单圆环均匀散布下子母弹单发射及相关射击对圆目标的毁伤概率计算公式,并讨论了子弹多环均匀散布下子母弹毁伤概率的计算方法。算例表明子弹双圆环内均匀散布时,子母弹对圆目标的毁伤概率要略高于子弹单环对圆目标的毁伤概率。 相似文献
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In the aftermath of September 11, 2001 and Hurricane Katrina, the United States government has spent tens of billions of dollars to improve the nation's ability to respond to a natural disaster or terrorist attack, but the emphasis on immediate first response has left many long-term environmental, political, and technological challenges unaddressed. Although a dirty bomb attack is unlikely to yield the same amount of physical devastation and death as caused by Katrina or a nuclear weapon, the social, psychological, and economic impact would be enormous. At present, however, the United States lacks the technology necessary to decontaminate a large, densely populated urban area under time, political, and economic constraints. This article reviews past cleanup experiences and current decontamination capabilities to consider the long-term implications of a dirty bomb, identifies weaknesses in America's existing response capabilities, notes possible areas of political friction, and considers the implications of the failure to adequately prepare. Having the appropriate decontamination techniques established and long-term plans in place before an incident occurs will significantly improve the government's ability to protect public and environmental security, establish a viable decontamination strategy, allow residents to return to their homes, and get the local economy back on its feet. 相似文献