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通过对代数次数增加情况的分析,研究了type-1广义Feistel结构下,单SP(substitution-permutation)模型与双SP模型抵抗高阶差分分析的能力。结合高阶积分与高阶差分思想,开发了四路type-1广义Feistel-SP与Feistel-SPSP结构代数次数上界估计的新方法。利用这一方法,分别构造了这2种结构在2种常用参数下的区分器。结果显示,四路type-1广义Feistel结构下,双SP模型抵抗高阶差分攻击的能力不如单SP模型。 相似文献
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In this paper, we propose a novel test of independence based on the concept of correntropy. We explore correntropy from a statistical perspective and discuss its properties in the context of testing independence. We introduce the novel concept of parametric correntropy and design a test of independence based on it. We further discuss how the proposed test relaxes the assumption of Gaussianity. Finally, we discuss some computational issues related to the proposed method and compare it with state-of-the-art techniques. 相似文献
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Spare bandwidth is required for recovering the network service from network faults. However, it degrades the efficiency of network utilization. Spare bandwidth demand can be reduced significantly by letting spare bandwidth be shared among several network services. Spare bandwidth reserved on a network element can be shared by a set of network services for a network fault if they are not simultaneously affected by the network fault. A new, and more practical spare bandwidth sharing scheme, which is based on the network reliability, is proposed in this paper. In the proposed scheme, multiple link failures are allowed with a given link failure rate, and a reasonable restoration level of near 100%; while in the conventional scheme, only a single link failure, and 100% restoration level are considered. To develop the spare bandwidth sharing scheme, we first investigate the framework for evaluating the reliability of path-based network services, and then we explain the proposed spare bandwidth sharing scheme with decision parameters such as lifetime of the path, restoration level, and the maximum number of working paths which can be protected by a backup link. Simulation results show that the proposed spare bandwidth sharing scheme requires a smaller amount of spare bandwidth than the conventional scheme. 相似文献
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为对装备供应链可靠性进行评估,构建了一种基于贝叶斯网络的评估模型.首先,阐述了装备供应链可靠性的基本概念,然后,介绍了装备供应链的主要环节,最后,根据贝叶斯网络的基本原理,将装备供应链的故障树模型转化为贝叶斯网络模型. 相似文献
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基于不可靠的链路,综合考虑了链路的质量与链路的延时,提出了一种新的转发可靠性概念,并在此基础上,设计了一种新的实时路由协议(RSPEED)。利用转发可靠性表示节点在给定的延迟阈值下成功将数据分组转发到邻居节点的概率,并以此保证路由的实时性和可靠性,提供一定的QoS服务。另外,当环境中链路质量比较差时,还能在满足实时性的基础上通过权衡传输延时与传输可靠性,从而获得更高的传输成功率。实验结果表明,提出的方法能够显著地提高分组的传输成功率和减少超过给定延迟阈值分组的数量,特别是当信道非常差时,提出的方法在满足实时性上比SPEED高出20%左右。 相似文献
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This paper describes a statistical approach to simulating the reliability of systems with HBT devices. Compared to the conventional worst-case method, the described approach utilizes statistical reliability information of the HBT individual devices, along with analysis on the critical paths of the system, to provide more accurate and more comprehensive reliability evaluation of the systems utilizing HBT devices. 相似文献
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The development of high-power light-emitting diode (LED) devices has been bedeviled by the reliability problems. And most reliability issues are caused by the packaging materials rather than the chips. However, which packaging material is the most influential remains unrevealed. To answer this question, a statistical method was introduced in this paper. Optical simulations were conducted to calculate the optical output power of LED package according to the orthogonal experimental design. Range and variance analyses were carried out to determine the significance of the relevant factors on the LED's light output. The results showed that the dome lens among the non-luminescent packaging materials had the most significance in affecting the light output. It is concluded that this method is useful in detecting the most significant part of LED packaging materials during the development of new packaging structures and is beneficial for enhancing the whole reliability of LED package effectively. 相似文献
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Parul Shah T. V. Srikanth Shabbir N. Merchant Uday B. Desai 《Signal, Image and Video Processing》2014,8(4):723-738
Image fusion has been receiving increasing attention in the research community with the aim of investigating general formal solutions to a wide spectrum of applications such as multifocus, multiexposure, multispectral ( $IR$ -visible) and multimodal medical (CT and MRI) image and video fusion. While there exist many fusion techniques for each of these applications, it is difficult to formulate a common fusion technique that works equally well for all these applications. This is mainly because of the different characteristics of the images involved in various applications and the correspondingly different requirements on the fused image. In this work, we propose a common generalized fusion framework for all these classes, based on the statistical properties of local neighborhood of a pixel. As the eigenvalue of the unbiased estimate of the covariance matrix of an image block depends on the strength of edges in that block, we propose to employ it to compute a quantity we call as the significance of a pixel. This generalized pixel significance in turn can be used as a measure of the useful information content in that block, and hence can be used in the fusion process. Several data sets were fused to compare the results with various recently published methods. The analysis shows that for all the image types into consideration, the proposed methods improve the quality of the fused image, both visually and quantitatively, by preserving all the relevant information. 相似文献
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基于无线自组织网络中节点的分布特征,结合对同道干扰的定量分析结果,给出了
一种适用于无线自组织网络的同道干扰统计模型。分析了无线自组织网络中同道干扰的统计
特性,并基于建立的同道干扰模型研究了无线自组织网络的系统性能。结果表明,同道干扰
对无线自组织网络的系统性能有严重影响,需建立合理的干扰模型才能更准确地评估自组织
网络的系统性能。 相似文献
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《现代电子技术》2019,(12):156-160
采用判决反馈方法评估无线传感器网络时,仅从网络链路稳定性因素方面考虑,未考虑影响网络可靠性的多种因素,自适应能力和可靠性评估效果差。设计基于多因子分析的无线传感器网络可靠性评估模型,利用多因子分析过程将无线传感器网络复杂的变量关系简单化。由5个主指标与20个有相互关联的子指标建立无线传感器网络可靠性评估指标体系,通过主成分分析方法分析指标体系获取11个无线传感器网络可靠性指标主因子。将这些因子输入神经网络模型中,构建无线传感器神经网络可靠性评估模型,完成无线传感器网络可靠性评估。实验结果表明,该模型的可靠性评估精度均值为98%,该模型下的无线传感网络可靠性最高达到98%,极大提高了无线传感器的安全性能。 相似文献
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The Duane reliability growth model has been traditionally used to model electronic systems undergoing development testing. This paper proposes a new reliability growth model derived from variance stabilisation transformation theory which surpasses the Duane model in typical reliability growth situations. This new model is simpler to plot and fits the data more closely than the Duane model whenever the Duane slope is less than 0.5. This paper explores the mathematical relationships between these two models; and shows that at a Duane slope of 0.5, both models are mathematically equivalent in their capacity to fit the observed data. The instantaneous MTBF of the new model is also developed and compared to that of Duane. As the new model is influenced by the later failures, compared to early failures for the Duane model, it has the further advantage of leading to reduced test times for achieving a specified instantaneous MTBF. As the reliability of electronic systems increases, this has positive implications for testing. 相似文献
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分布式电源功率输出的随机性和间歇性及其并入电网的位置,会影响配网供电能力的可靠性.文中对此展开研究,首先建立了分布式电源、风电以及光伏发电三种数学模型,同时研究了负荷和系统可靠性指标概率分布特征,然后提出了一种将网络等值与拟蒙特卡罗联合法用于配电系统可靠性的定量评估,最后结合改进的IEEE-RBTS Bus6的F4馈线... 相似文献
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The concepts of ordered code-book and the priority of code-vector are proposedin this paper.The statistical properties of a signal are investigated through its coded sequence.Experimental results are presented which provide some insight into the statistical properties ofvector quantized sequences.Based on the given concepts and experimental results,a fast searchmethod for the vector quantization of correlated information sources,such as Gauss-Markovsources,is proposed and has shown its efficiency in simulation results. 相似文献
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Jon A. Sjogren 《Microelectronics Reliability》1989,29(6)
The global reliability of a communications network is the probability that given any pair of nodes, there exists a viable path between them. A characterization of connectivity, for a given class of networks, can enable one to find this reliability. Such a characterization is described for a useful class of undirected networks called “daisy-chained” or “braided” networks. This leads to a new method of quickly computing the global reliability of these networks. Asymptotic behavior in terms of component reliability is related to geometric properties of the given graph. Generalization of the technique is discussed. 相似文献
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一种计算随机流网络可靠性的新算法 总被引:2,自引:0,他引:2
提出了一种计算随机流网络可靠性的新方法。通过一定的规则生成网络的状态树,使得每一个分支都是全序集合。在生成状态树的同时搜索每一个分支,对状态采用基于割集的方法进行判断。每个分支上的最小的有效状态就是网络的d-下界点。求得所有的d-下界点,进而求出网络的可靠性。 相似文献
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A hierarchical computer network with branched structure containing three data processing levels and realizing, in fixed time intervals, a determined set of tasks is considered as a class of such networks. The influence of the number of users on the number of realized tasks and on the assumed reliability measure is discussed. 相似文献