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11.
比较了认知无线电网络中几种典型的协作感知方案在篡改感知数据(SSDF)攻击条件下的感知性能,并提出了一种增强型加权序贯检测（EWSPRT）协作方案。在该方案中,各次用户首先通过能量检测得到2 bit本地决策,然后收集其它协作用户的感知结果进行决策融合和最终判决,并依据历史观测信息动态更新各协作用户的融合权重;利用改进的信任度更新算法能使恶意用户的融合权重更快地降低,从而有效地减少SSDF攻击对协作过程的影响。Monte-Carlo仿真结果表明,与传统方案相比,EWSPRT方案能够更有效地抵抗SSDF攻击。 相似文献
12.
《Journal of medical economics》2013,16(4):331-338
AbstractObjective: To estimate the clinical outcomes and costs associated with reconfiguring the management of TIA in the UK to offer patients rapid access to outpatient clinics for specialist assessment and treatment.Methods: An economic deterministic model was run comparing two pathways – one arm representing current clinical care based on national guidelines and clinical practice and patient referral to a weekly outpatient clinic, and a revised care pathway replicating phase 2 of the EXPRESS study with patient referral to a daily outpatient clinic. The outcomes of the model were measured in terms of recurrent strokes avoided and net budget impact to secondary care.Results: Reconfiguring TIA care pathways in the UK could result in the avoidance of 8,164 recurrent stroke events. The model predicts savings of £25,573,279 for the UK healthcare system over 12 months. Annual net savings are predicted in England (£24,916,011), Scotland (£80,554) and Northern Ireland (£1,041,817). In Wales, increased costs of £450,435 are estimated.Limitations: Using the data published from the EXPRESS study, it is not possible to model a stepwise approach to implementing the revised TIA care pathway. It is therefore assumed that it would be possible to implement the revised TIA care pathway as detailed in the EXPRESS study across the UK and achieve the reduction in recurrent stroke risk that was reported.Conclusions: The model suggests that the reconfiguration of TIA care pathways in the UK to offer rapid access to treatment and assessment could prevent TIA-related future stroke events and potentially result in cost savings to the healthcare system. 相似文献
13.
Michel Cyrille Samba 《International economic journal》2013,27(3):470-482
ABSTRACTThe current empirical study contributes to the literature on the exchange market pressure. First we construct as proposed by Eichengreen, Rose, and Wyplosz [1996. Contagious currency crises: First tests. The Scandinavian Journal of Economics, 98 (4), 463–484], a continuous measure of EMP for the CAEMC franc zone, using quarterly data from 1985Q1 to 2012Q2. We then address the main macroeconomic determinants of this EMP.We find that our main measure for EMP as well as two alternative measures of this index captures quite well episodes of crises of the CFA (XAF) currency. During the period of study, the common currency of the CAEMC countries experienced about four speculative attacks, with the one in 1993 ending with the devaluation of that currency in January 1994. The other attacks were warded off through reserves losses, as it is clear that the currency peg was maintained principally through changes in reserves. We also find that the GDP growth, the trade balance and the international oil price are the main contributors of EMP and therefore the most significant predictors of currency crises in the CAEMC area. 相似文献
14.
数字化时代的报纸生存 总被引：1，自引：0，他引：1
陈飞 《浙江工商职业技术学院学报》2009,8(1):30-31
在网络媒体的冲击下,传统报纸的生存一度岌岌可危,甚至有人预言,传统报纸会在2044年走向灭亡。而事实上,虽然网络媒体确实取得了迅猛的发展,网络广告市场增长强劲,但报纸并未因此而走向末路,毕竟传统报纸在本地新闻和深度报道上的优势,仍是网络媒体所无法企及的。面对网络媒体的竞争压力,传统报纸媒体如果能充分发挥自己的特长,通过掌握内容资源优势来对抗网络媒体的技术优势,那么传统报纸反而能借助网络来扩大自己影响力,增强自身生存能力。从某种程度上来说,正是网络媒体咄咄逼人的姿态,促使传统报纸扬长避短,走上转变报道内容与方式的改革之路,从而增强了报纸的竞争力与生命力。 相似文献
15.
This paper analyzes a small open economy model under inflation targeting. It shows why such a monetary regime is vulnerable to speculative attacks that take place over a short period rather than instantaneously. The speed at which the regime collapses, and the extent of reserve losses, are increasing in the central bank's explicit or implicit commitment to intervene in the foreign exchange market. Attacks are therefore ranked, from most to least severe, as follows: Exchange rate targeting, CPI inflation targeting, domestic nontradables inflation targeting, and money targeting. Under inflation targeting the size of the attack is increasing in the tradables consumption share. 相似文献
16.
杜文晟 《黄石理工学院学报》2007,23(6):37-40
结合高校机房管理实践,分析了常见的ARP欺骗攻击的表现形式、主要危害及运作原理,提出了实际可操作的、比较完善的解决方法. 相似文献
17.
内容中心网络（CCN）是一种革命性的网络架构,采用内容路由、网内缓存等技术来提高网络中的内容分发效率,但其自身的结构特点使之面临很多的安全问题。通过对CCN网络工作机制的研究,分析了CCN面临的非授权访问、隐私泄露、泛洪攻击等安全风险;然后,总结了每种安全风险的解决方案及各自优缺点;最后,展望了未来的研究方向。 相似文献
18.
19.
Woondo Choi 《Global Economic Review》2013,42(1):51-67
Two cases of China and Japan are compared in the two dimensions of strategic doctrine and the RMA program. China is disadvantaged in its general military capability; it cannot help but gain the initiative by striking first and doing the operation under a high degree of secrecy, mobility, accuracy in its concentration of firepower, and surprise. This is called the doctrine of “strategic attack” and the Chinese defense planning is called “strategic modernization.” On the other hand, the Japanese approach to RMA is called “Info‐RMA”. The Japanese basic defense strategy is a passive one and it is critical to protect the information infrastructure as Japanese territories might turn out to be the battlefield. Japan should be ready for the possibility that some pre‐RMA forces would employ asymmetrical means such as weapons of mass destruction (WMD), terrorism, or guerilla warfare. Self‐Defense Forces (SDF) also should be ready to accomplish diverse missions, such as rear‐area support for U.S. troops, as well as peacekeeping operations and disaster relief. It is ironic that the Chinese doctrine could not help but be aggressive to compensate for the weakness of strategic intelligence capability in comparison to the U.S. On the other hand, Japan could develop power‐projection capability under the name of strategic intelligence as a part of the Exclusively Defense‐Oriented Policy. 相似文献
20.
攻击型受欺负儿童是与攻击者及单纯受欺负者有关的不同群体,这类儿童在社交、学习等方面均表现较差,且有不良情绪问题,是处境较为不利的一类儿童。因此,本研究将系统考察攻击型受欺负儿童的特点,以期系统把握其整体状况,了解家庭各相关变量的影响作用,为家庭教育和心理健康指导提供依据。 相似文献