Transforming the Spanish military

The article analyses the Spanish military transformation. This process started in 2004 as a means to adapt the force structure, organization and capabilities of the Spanish military to meet present and future threats in compliance with NATO’s initiatives, thus ensuring the continuity of the equipment modernization, professionalization and the adjustment of the country’s defence architecture to the post-cold war environment. A decade later, although transformation is still a priority for the Ministry of Defence, limited political will, a lack of strategic guidance, poor resource management and the effects of the economic crisis are compromising its development. This article describes the Spanish military transformation and assesses its value in adapting the country’s armed forces to the current and prospective security environment.     

AES密码的三种等价形式

分离了AES密码中S盒的仿射变换,得到了与原密码S盒不同的三种等价密码.研究发现列混合矩阵在很大程度上影响仿射变换的提取,在这种意义上提出了对列混合变换的改进建议.     

全局仿射变换条件下图像不变量提取新方法

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基于Chirp变换的快速离散时间尺度变换

提出了一种新的快速离散时间尺度变换算法。给出了离散时间信号尺度变换的构造表达式及其Chirp变换快速实现流程。讨论了Chirp变换实现中的参数选取准则,分析了Chirp变换的信号带宽问题。讨论了算法的运算效率并与其它算法进行了比较。仿真试验证明了本文算法的有效性。