差分跳频码性能检验研究

差分跳频是一种新的扩展频谱通信技术.在介绍差分跳频基本原理的基础上,将差分跳频的频率跳变过程建模成齐次马尔可夫链.分析了G函数的功能,重点讨论了差分跳频码性能的检验方法,包括不可约性、频隙滞留、均匀性和随机性检验,其中频隙滞留是首次提出应用于差分跳频码性能的检验.这些检验方法对于差分跳频G函数的设计具有一定的指导意义.     

高精度气压源的Fuzzy-PID控制研究

设计了Fuzzy-PID双模控制器并应用到高精度气源压力控制系统中.试验表明,单纯采用PID控制的高精度气源压力控制系统具有精度高的优点,但不适应系统参数的变化.Fuzzy-PID双模控制器具有响应速度快、稳态误差小、鲁棒性强的优点.通过试验比较了传统PID、Fuzzy控制和Fuzzy-PID双模控制3种控制策略,试验结果表明,Fuzzy-PID双模控制器综合了Fuzzy控制和PID控制的优点,适用于高精度气源压力控制系统.     

一类非线性时滞双曲型偏微分方程的振动性

研究一类非线性时滞双曲型偏泛函微分方程解的振动性,利用微分不等式方法和广义Riccati变换,获得了该类方程在第一类边值条件下振动的新的充分条件,所得结果通过实例加以阐明.     

Neo-conservation

Africa's wildlife is in danger. The last couple of years have been disastrous for the African elephant as poaching for ivory reached record numbers. Rhinos have been hit hard with several sub-species becoming extinct. The current anti-poaching and anti-trafficking operations lack the sophistication and determination that is found abundantly within criminal organisations immersed in this illicit trade. Terrorism, rebellious elements and corrupt officials all benefit from the destruction of Africa's eco-system and the inaction or lack of efficient action thereof by law enforcement officials. This commentary suggests new courses of action using methods from the fields of counter-terrorism and special operations.     

UNITED NATIONS SECURITY COUNCIL REFORM

Much has changed since the United Nations was established in 1945. New challenges confront the organization including global warming, global diseases and global terrorism. Responding to these challenges requires continual change, adaptation and learning—a hallmark of the stewardship of current UN Secretary General Kofi Annan. In 1997 Annan announced major structural changes to streamline the organization, follow up five years later by another initiative to clarify, simplify and rationalize the organization and subsequent efforts to streamline UN peacekeeping. The UN has also forged new partnerships with civil society and the private sector. Important as these changes are, reform of the General Assembly and the Security Council hold the organization hostage to the vested interests of key member states. There are a number of options to make the Council more representative including regionalism, population distribution, economic weight, culture/religion/civilization and democracy. Clearly the largest challenge is the absence of representation for Asia, Africa and Latin America. Currently Germany, Japan, India and Brazil have strong claims—plus at least one candidate from Africa. Should these four countries decide to act in unison, they could force reform of the Security Council     

The inherent propensity toward peace or war embodied in weaponry

Thomas Schelling argues that armed adversaries face an inherent propensity toward peace or war embodied in their weaponry, geography and military organizations. Inherent propensity is the idea that there are characteristics embodied in the weapons that push adversaries toward peace or war, independent of the goals of the decision‐makers, the political disagreement between adversaries, and misperceptions about mutual resolve and hostility. We theoretically illustrate inherent propensity in conventional and nuclear arms settings using Lanchester and Intriligator war models. Our work extends the Intriligator‐Brito model, identifies when the competing Richardson and Intriligator‐Brito views of the relationship between arms races and war are correct, illustrates the stabilizing/destabilizing effects of alliances, and highlights the importance of arms quality control in the US‐USSR relationship.     

一种针对HIGHT的改进差分故障的分析

为评估HIGHT轻型分组密码抗故障攻击能力,基于单字节故障模型,提出一种改进的HIGHT故障攻击方法．首先在HIGHT最后1轮注入单字节故障恢复SK124和SK1262个轮密钥,然后增加故障注入深度,在HIGHT倒数第5轮注入单字节故障恢复HIGHT另外10个轮密钥,从而恢复HIGHT的全部主密钥．实验结果表明：仅需22次故障注入即可恢复HIGHT全部128位主密钥,优于现有故障攻击方法所需的32次故障注入．     

The practice and theory of British counterinsurgency: the histories of the atrocities at the Palestinian villages of al-Bassa and Halhul, 1938–1939

This article details two largely unreported atrocities by British forces operating against Arab rebels during the Arab revolt, 1936–9, at the Palestinian villages of al-Bassa and Halhul. It then examines the military-legal system that underpinned and authorised British military forces operating in aid of the civil power, suggesting that the law in place at the time allowed for a level of reprisals and punitive actions, such as happened at al-Bassa and Halhul. The article does not conclude that the law allowed for atrocities but it does argue that it gave a basic form and understanding to an operational method that was brutal and could lead to atrocities. It thus tests the idea in much of the literature on counterinsurgency that the British were restrained and used minimum force when compared to other colonial and neo-colonial powers fighting insurgents.     

The virtual dimension of contemporary insurgency and counterinsurgency

This paper looks at the virtual dimension of contemporary insurgency and counterinsurgency. It argues that the West is faltering in the ‘War of Ideas’ with global Jihad for the main reason that the messages that we wish to convey lack narrative coherence. This is a result of the fact that we misapprehend the nature of the virtual operational environment whereas our opponents possess an intuitive grasp of it as a result of which their structure and method of operations are better adapted and more effective than our own. There is no reason, beyond inertia, that this should remain the case.     

Zodiac算法新的不可能差分攻击

重新评估了Zodiac算法抵抗不可能差分攻击的能力。通过分析Zodiac算法的线性层,给出了Zodiac算法两条新的14轮不可能差分。利用新的不可能差分,结合Early-Abort技术对完整16轮的Zodiac算法进行了不可能差分攻击。攻击过程中一共恢复6个字节的密钥,其时间复杂度只有2_32.6次加密,数据复杂度约为2_85.6个明文,该攻击结果与已有最好的结果相比,时间复杂度降低了一个因子2₃₃。结果表明由于Zodiac算法线性层的扩散性差,使得该算法对不可能差分分析是不免疫的。