基于小波分析对网络协议指纹识别的研究

小波分析是当前信号、信息获取与处理领域(尤其是故障诊断分析与检测技术)中一个十分活跃且迅速发展的新领域,是当今国际研究热点,它同时具有理论深刻和应用十分广泛的双重意义。基于小波分析对网络协议进行指纹识别研究,利用小波变换把原始信号分解成多频段的信号,对信号进行塔式分解,通过计算处理每一层取得所有的有关Wi信息,提取指纹特征信息,并提出了检测方法和指纹识别系统的体系结构,对解决当今日益突出的网络安全问题进行有益尝试。     

Inventory competition with yield reliability improvement

This article studies the inventory competition under yield uncertainty. Two firms with random yield compete for substitutable demand: If one firm suffers a stockout, which can be caused by yield failure, its unsatisfied customers may switch to its competitor. We first study the case in which two competing firms decide order quantities based on the exogenous reliability levels. The results from the traditional inventory competition are generalized to the case with yield uncertainty and we find that quantity and reliability can be complementary instruments in the competition. Furthermore, we allow the firms to endogenously improve their yield reliability before competing in quantity. We show that the reliability game is submodular under some assumptions. The results indicate that the competition in quantity can discourage the reliability improvement. With an extensive numerical study, we also demonstrate the robustness of our analytical results in more general settings. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 107–126, 2015     

信号源检定装置不确定度的评定

在填写"建立计量标准技术报告"时,要求报告中所涉及的内容要准确、可靠,对所测的数据及实验结果要实事求是。其重要目的是应根据分析结果直接判断计量标准是否符合国家检定系统表和国家计量检定规程的要求,做出计量标准是否可以开展所申请项目的检定校准工作的结论。就不确定度的评定做了详尽的分析,并给出了相应的算法。     

Why provoke? the Sino-US competition in East Asia and North Korea’s strategic choice

This article seeks to make sense of North Korean provocations in light of the Sino-US strategic competition in post-Cold War East Asia, where such variables as China’s rise, US’s pivot to Asia, and growing Sino-ROK economic ties are driving the strategic choices of major states in the region. The article examines the main motivations behind Pyongyang’s provocations since the end of the Cold War, discusses their implications for the Sino-US strategic competition in East Asia, and offers predictions about the future of North Korean provocations. The central thesis of the article is that Pyongyang has exploited the Sino-US strategic competition in East Asia for its regime survival. By raising North Korea’s strategic value to China, the intensifying Sino-US competition allows Pyongyang to continue provocations, regardless of Beijing’s explicit opposition.     

Competitive location and capacity decisions for firms serving time‐sensitive customers

In this article we explore how two competing firms locate and set capacities to serve time‐sensitive customers. Because customers are time‐sensitive, they may decline to place an order from either competitor if their expected waiting time is large. We develop a two‐stage game where firms set capacities and then locations, and show that three types of subgame perfect equilibria are possible: local monopoly (in which each customer is served by a single firm, but some customers may be left unserved), constrained local monopoly (in which firms serve the entire interval of customers but do not compete with each other), and constrained competition (in which firms also serve the entire interval of customers, but now compete for some customers). We perform a comparative statics analysis to illustrate differences in the equilibrium behavior of a duopolist and a coordinated monopolist. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

基于脊线相似性的指纹三角形匹配算法

指纹匹配算法是指纹准确识别的关键算法之一。在常见的三角形匹配算法的基础上，提出了一种改进的基于脊线相似性的三角形匹配算法。在对指纹预处理图像进行八邻域特征提取后，利用脊线的相似性选择特征点进行三角形匹配，在一定程度上减少了相似三角形的个数，提高了匹配速度与精度。实验证明，本算法取得了良好的识别效果。     

一种基于核心数据区监视的交叉验证方法

通常商用体系结构模拟器不开源,仿真过程中无法直接获取中间结果.提出了一种基于核心数据区监视的交叉验证方法,可将体系结构模拟器运行过程中核心数据区的变化情况提取出来,用以支持该模拟器与寄存器传输级代码的模拟结果进行交叉比对,快速精确定位两者的执行差异,提高验证人员的查错效率.实验分析和实际应用表明,本方法比传统方法可将查...     

Wisdom without tears: Statecraft and the uses of history

The world is mired in history again, as historical modes of competition return and historical grievances fuel the policies of multiple revisionist actors. If the end of history has ended, then it follows that the time is ripe for an engagement with history’s wisdom. We argue that the making of American statecraft—the deliberate, coordinated use of national power to achieve important objectives—can be significantly enhanced by a better understanding of the past. This essay, which draws on the extensive literature on history and statecraft, U.S. foreign policy, and the author’s own research and experiences, offers a defense of the use of history to improve statecraft, as well as a typology of ten distinct ways in which an understanding of history can improve government policy.     

Some implications of pricing bundles

In this article, we consider a problem in which two suppliers can sell their respective products both individually and together as a bundle, and study the impact of bundle pricing. Four pricing models (centralized, decentralized, coop–comp, and comp–coop) are analyzed with regard to the competition formats and sequences. As one would expect, the firms are always better off when pricing decisions are centralized. However, rather surprisingly, we find that firms may be worse off if the bundle prices are set in a cooperative way; we provide analytical characterization of those instances. Numerical studies show that these insights also hold for some nonlinear demand. © 2013 Wiley Periodicals, Inc. Naval Research Logistics, 2013     

Research communication

A UK House of Commons Defence Committee (HCDC) Report on the Gulf War recommended that the UK should be self‐sufficient in supporting its Armed Forces in times of crisis and not even rely on its Allies. This recommendation is at odds with UK Government policy which rejects any formal strategy of support for the defence industrial base preferring international open competition as its procurement philosophy. This paper examines the various factors ranging from the supply of raw materials, production capacity, stockpiling, international joint ventures, and competition through to the effects on the technological update of weapon systems resulting from this philosophy. It draws conclusions supporting the HCDC recommendation and calls for joint MOD‐Industry action to address the issues involved and thereby reduce the risks to the Defence of the Realm.