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21.
针对传统可分割作业多路调度算法不能适应动态网格环境的不足,基于统一多路(Uniform Multi-Round:UMR)算法,提出一种可靠的可分割作业调度机制.系统动态地监控网格资源的变化,当资源发生变化时,通过性能预测与评估,及时地对剩余作业进行再调度.实验表明,较之传统的多路调度算法,该机制在动态的网格环境下,降低了作业完成时间,有效地利用了网格资源,提高了作业调度的可靠性. 相似文献
22.
谱聚类是一种极具竞争力的聚类算法.相似度定义对谱聚类算法的性能有至关重要的影响.本文用两点的共享近邻数目表征局部密度,从而获知隐含的簇结构信息.将这一信息与自调节的高斯核函数结合,提出了基于共享近邻的自适应相似度及相应的谱聚类算法.它满足聚类假设的要求,具有局部密度的自适应性,能有效识别数据点之间的内在联系.典型人工和真实数据集上的实验结果证明了算法的有效性. 相似文献
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When implementing multivalued consensus using binary consensus, previous algorithms assume the availability of uniform reliable broadcast, which is not implementable in systems with fair-lossy links. In this paper, we show that with binary consensus we can implement uniform reliable broadcast directly in systems with fair-lossy links, and thus the separate assumption of the availability of uniform reliable broadcast is not necessary. We further prove that, when binary consensus instances are available only as black boxes, any implementation of uniform reliable broadcast in the fair-lossy link model requires the invocation of an infinite number of binary consensus instances even if no process ever broadcasts any messages, and this is true even when multivalued consensus is used. 相似文献
25.
Geno-mathematical identification of the multi-layer perceptron 总被引:1,自引:0,他引:1
Ralf Östermark 《Neural computing & applications》2009,18(4):331-344
In this paper, we will focus on the use of the three-layer backpropagation network in vector-valued time series estimation
problems. The neural network provides a framework for noncomplex calculations to solve the estimation problem, yet the search
for optimal or even feasible neural networks for stochastic processes is both time consuming and uncertain. The backpropagation
algorithm—written in strict ANSI C—has been implemented as a standalone support library for the genetic hybrid algorithm (GHA)
running on any sequential or parallel main frame computer. In order to cope with ill-conditioned time series problems, we
extended the original backpropagation algorithm to a K nearest neighbors algorithm (K-NARX), where the number K is determined genetically along with a set of key parameters. In the K-NARX algorithm, the terminal solution at instant t can be used as a starting point for the next t, which tends to stabilize the optimization process when dealing with autocorrelated time series vectors. This possibility
has proved to be especially useful in difficult time series problems. Following the prevailing research directions, we use
a genetic algorithm to determine optimal parameterizations for the network, including the lag structure for the nonlinear
vector time series system, the net structure with one or two hidden layers and the corresponding number of nodes, type of
activation function (currently the standard logistic sigmoid, a bipolar transformation, the hyperbolic tangent, an exponential
function and the sine function), the type of minimization algorithm, the number K of nearest neighbors in the K-NARX procedure, the initial value of the Levenberg–Marquardt damping parameter and the value of the neural learning (stabilization)
coefficient α. We have focused on a flexible structure allowing addition of, e.g., new minimization algorithms and activation
functions in the future. We demonstrate the power of the genetically trimmed K-NARX algorithm on a representative data set. 相似文献
26.
基于流媒体的隐蔽通信可靠传输机制的研究 总被引:3,自引:0,他引:3
首先分析了原有流媒体隐蔽通信系统模型在传输机制上存在的问题.在此基础上改进了原有的传输方案,提出了一种新的基于流媒体的隐蔽通信的可靠传输机制,并进行实现和实际测试.实验结果表明,对于只有当载体满足一定条件时才可以嵌入的隐藏算法,新的传输机制也能保证可靠传输,性能较以前的方法也有长足的改善. 相似文献
27.
28.
以发布/订阅范型在时间维度上解耦导致的不确定性为出发点,采用时序分析方法,研究范型中信息投递的可靠性保障。在定义投递信息可用性的基础上,给出保证信息向订阅者可靠投递系统应满足的基本计算条件,探讨底层通信设施对可靠性的影响。针对发布/订阅范型中信息可靠投递的问题,提出必要的计算条件。分析结果表明,信息的可靠投递与订阅活跃期、订阅延迟、发布传播延迟密切相关。 相似文献
29.
This paper focuses on the optimal robust reliable H∞ control for a class of uncertain nonlinear systems with actuator faults. A new method of annihilating uncertain matrix is proposed. Based on this approach, a new method of disposing of the phenomenon of uncertain matrices multiplication is provided. In accordance with the method, the optimal robust reliable H∞ control problem for uncertain nonlinear systems is settled by employing state feedback, in terms of linear matrix inequality (LMI). Finally, two illustrative examples are given to show the feasibility and validity of the proposed method. 相似文献
30.
A Simultaneous Mixed LQR/H∞ Control Approach to the Design of Reliable Active Suspension Controllers
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Jenq‐Lang Wu 《Asian journal of control》2017,19(2):415-427
This paper is concerned with the synthesis of reliable controllers for quarter‐car active suspension systems. By a simultaneous mixed LQR/H∞ control approach, a static output feedback controller is derived for guaranteeing good suspension performance under possible sensor fault or suspension component breakdown. The considered simultaneous mixed LQR/H∞ control problem is a nonconvex optimization problem; therefore, the linear matrix inequality approach is not applicable. Based on the barrier method, we solve an auxiliary minimization problem to get an approximate solution for the simultaneous mixed LQR/H∞ control problem. Necessary conditions for the local optimum of the auxiliary minimization problem are derived. Moreover, a three‐stage solution algorithm is developed for solving the auxiliary minimization problem. The simulation shows that the obtained static output feedback suspension controllers can improve suspension performance in nominal mode and all considered failure modes. 相似文献