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容错系统的可靠性分析是容错系统设计过程中最重要的步骤之一.在容错控制系统的可靠性分析中,利用马尔可夫过程和半马尔可夫过程理论对容错系统进行可靠性建模能够较为真实地描述系统的实际工作情况.但是,由于容错系统为了达到高可靠性而采用了大量的冗余配置及重构技术,使得该可靠性模型往往变得相当复杂.因此,对系统可靠性模型进行必要的化简,可以减少许多计算量并使该模型更加符合实际使用要求. 相似文献
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INTRODUCTIONHowtoprotectthedatabase ,thekernelre sourcesofinformationwarfare,isbecomingmoreandmoreimportantsincetherapiddevelopmentofcomputerandcommunicationtechnology .TheArtificialIntelligenceInstituteofZhejiangUni versityhasprototypedaDatabaseSecuritya… 相似文献
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一种入侵容忍的资料库 总被引：2，自引：0，他引：2
ARECA的设计保护了CA私钥的保密性，使ARECA能实时在线地为用户签发证书或撤销证书；但作为安全的在线CA，分发证书的资料库的安全也是关键问题。ARECA的资料库是入侵容忍的，通过将复制的服务器组织成分发屏蔽失效法定数目团体系统，能屏蔽良性失效或者被攻击者控制的服务器的行为，为用户提供正确的证书和证书撤销列表查询服务。异步通信条件下，n>3f个服务器组成的资料库能够容忍至多f个服务器同时失效。 相似文献
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《中华人民共和国刑法修正案（八）》在体现了相对宽松的刑事政策的同时,也对一些重罪和高危险犯罪采取了较为严厉的刑事政策,可谓宽严相济,这对我国的刑法体系日趋现代化和合理化有着重要的意义,但同时也存在着一些明显的不足,需要进一步研究。 相似文献
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BackgroundArsenic contamination in the ground water of rural India is a recurrent problem and decontamination is mostly based on the chemical or physical treatments until now. Microbial bioremediation is eco-friendly, cheap, time-efficient and does not produce any toxic by-products.ResultIn the present study, a high arsenic tolerant bacteria Brevundimonas aurantiaca PFAB1 was isolated from Panifala hot spring located in West Bengal, India. Previously Panifala was also reported to be an arsenic-rich hot spring. B. aurantiaca PFAB1 exhibited both positive arsenic reductase and arsenite oxidase activity. It was tolerant to arsenite up to 90 mM and arsenate up to 310 mM. Electron microscopy has proved significant changes in cellular micromorphology and stalk appearance under the presence of arsenic in growth medium. Bioaccumulation of arsenic in As (III) treated cells were 0.01% of the total cell weight, while 0.43% in case of As (V) treatment.ConclusionsAll experimental lines of evidence prove the uptake/accumulation of arsenic within the bacterial cell. All these features will help in the exploitation of B. aurantiaca PFAB1 as a potent biological weapon to fight arsenic toxicity in the near future.How to cite: Banerjee A, Sarkar S, Gorai S, et al. High arsenic tolerance in Brevundimonas aurantiaca PFAB1 from an arsenic-rich Indian hot spring. Electron J Biotechnol 2021:52. https://doi.org/10.1016/j.ejbt.2021.05.006 相似文献
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对一类具有范数有界参数不确定性广义系统,运用矩阵不等式方法,提出了一种鲁棒容错反馈设计方法.利用该方法设计的闭环系统,不仅针对执行器发生故障时具有完整性,而且对所有容许的参数不确定性具有鲁棒性. 相似文献
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网络信息系统容灾技术研究 总被引：1，自引：0，他引：1
随着数据信息越来越成为核心资源，网络信息系统的高可用性和容灾能力已成为焦点，如何构建远程容灾系统成为网络信息系统的关键之一，文章从容灾的基本原理入手、阐述了容灾系统的类型及主要性能指标，分析了容灾的关键技术及选用原则，最后给出了一种基于Internet的异地容灾系统实现方案．该方案采用两层容灾结构：网络服务系统容灾和网络存储系统容灾． 相似文献
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Jingwei Miao Omar Hasan Sonia Ben Mokhtar Lionel Brunie Kangbin Yim 《International Journal of Information Management》2013
Message routing in mobile delay tolerant networks inherently relies on the cooperation between nodes. In most existing routing protocols, the participation of nodes in the routing process is taken as granted. However, in reality, nodes can be unwilling to participate. We first show in this paper the impact of the unwillingness of nodes to participate in existing routing protocols through a set of experiments. Results show that in the presence of even a small proportion of nodes that do not forward messages, performance is heavily degraded. We then analyze two major reasons of the unwillingness of nodes to participate, i.e., their rational behavior (also called selfishness) and their wariness of disclosing private mobility information. 相似文献
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欧阳健 《内江师范学院学报》2012,27(1):8-14
古代小说作家考证是古代小说研究的重要一翼,一百年来取得了相当成绩,也带来了相当的困扰,归结起来无非是“信”、“疑”二字。古小说作家考证是重要的,要紧的是搞清作者的生平和所处的时代,在甄别相关文献时要提倡包容的心态,不薄今人信古人。古人的记录,往往是相对可靠的：倒是后人的“辨疑”,反可能是有问题的。 相似文献