共查询到20条相似文献,搜索用时 109 毫秒
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王芬 《数学的实践与认识》2016,(8):249-256
高阶Hopfield神经网络可以看作是Hopfield神经网络的扩展,相对一阶神经网络而言,高阶神经网络在存储能力、逼近能力、容错水平和收敛速度等方面具有更强大的能力.利用构造合适的Lyapunov泛函,应用不等式性质,研究了一类具有脉冲的高阶时滞Hopfield神经网络的动力学行为,得到了确保该系统的平衡点全局指数稳定的充分判别条件.通过两个仿真例子,说明所得结论的有效性. 相似文献
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过程能力指数已广泛地应用于度量和评价过程性能。使用各种标准能力指数的先决条件是测量数据相互独立,且服从正态分布;然而,对流程性材料生产过程,测量数据往往不满足应用过程能力指数的条件。本文根据确定过程能力指数的基本思想,提出了拓广的过程能力指数Cpp,以给出流程性材料过程性能的评价方法,并通过具体事例证实了这种方法的可行性和有效性。 相似文献
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研究了一类具有状态时延和网络诱导时延的非线性不确定性网络系统的指数稳定控制问题。利用T-S模糊控制方法,建立了非线性网络系统模型。基于Lyapunov稳定性理论和线性矩阵不等式方法,得到系统指数稳定的充分条件。并在此基础上设计系统的状态反馈模糊控制器。最后仿真算例说明了该方法的有效性。 相似文献
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研究一类模糊时滞系统的指数稳定和基于观测器的模糊控制问题.在系统状态未知的情况下,通过设计系统的模糊观测器利用矩阵不等式分析的方法给出了系统指数稳定条件和基于观测器的动态输出反馈控制器设计方案.仿真结果说明了所提方法的有效性. 相似文献
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该文研究了一类具有不连续捕获项的非光滑混合时滞Lasota-Wazewska模型.基于非光滑分析、Kakutani's不动点理论和常Lyapunov方法,建立了易于验证的与时滞无关的稳定性准则,同时保证模型的正周期解的存在性和全局指数稳定性,并给出了对应的仿真实例来验证该文中方法的正确性和有效性. 相似文献
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从需求因素、供给因素、技术因素、可持续发展和对外贸易五方面构建了中国工业结构转换能力评价指标体系,运用反映指标变异程度差异信息的熵值法和离差最大化法以及反映指标关联程度差异信息的BP-DEMATEL方法确定指标权重,然后运用最小距离—最大熵方法对不同的权重结果进行集成得到组合权重,以此权重对中国30个省份的工业结构转换能力进行了静态与动态评价。评价结果显示中国工业结构转换能力各省份非均衡发展现象突出,呈现从东向西阶梯状递减的规律。 相似文献
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多级混沌映射变参数伪随机序列产生方法研究 总被引:4,自引:0,他引:4
针对单混沌系统因计算机有限精度效应产生的混沌退化问题,提出了一种多级混沌映射变参数伪随机序列产生方法,基于该方法构建的混沌系统较单混沌系统具有伪随机序列周期大,密钥数量多,密钥空间大等优势,所产生的密码具有更高的安全性能.仿真结果表明,该方法在低复杂度条件下可以生成大量具有良好自相关和互相关特性的混沌序列,在安全领域具有良好的应用前景. 相似文献
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给出模糊矩阵广义一致性变换的定义,并论证模糊矩阵经广义一致性变换后所具有的性质;通过对比分析指出本文的研究结论具有更广的应用范围;从分辨率角度给出参数取值范围的一个合理区间;从而拓展基于模糊一致判断矩阵的层次分析法的应用范围。 相似文献
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针对不同标度构造的判断矩阵的一致性检验以及排序问题,给出了判断矩阵广义一致性变换的定义,并论证了判断矩阵经广义一致性变换后所具有的性质通过对比分析指出研究结论具有更广的应用范围,深化了对参数β的理解,给出了参数β取值范围的一个合理区间.进而归纳出由不同标度法构造的判断矩阵的具体的广义一致性变换及其排序方法. 相似文献
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Mohsen Jahangirian Tillal Eldabi Aisha Naseer Lampros K. Stergioulas Terry Young 《European Journal of Operational Research》2010
This paper reports the results of a review of simulation applications published within peer-reviewed literature between 1997 and 2006 to provide an up-to-date picture of the role of simulation techniques within manufacturing and business. The review is characterised by three factors: wide coverage, broad scope of the simulation techniques, and a focus on real-world applications. A structured methodology was followed to narrow down the search from around 20,000 papers to 281. Results include interesting trends and patterns. For instance, although discrete event simulation is the most popular technique, it has lower stakeholder engagement than other techniques, such as system dynamics or gaming. This is highly correlated with modelling lead time and purpose. Considering application areas, modelling is mostly used in scheduling. Finally, this review shows an increasing interest in hybrid modelling as an approach to cope with complex enterprise-wide systems. 相似文献
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This article presents a hybrid model for the multiple criteria decision making problems. The proposed decision model consists of three parts: (i) DEA (data envelopment analysis) is used to provide the best combination on the performance parameters of original data; (ii) By the application of AFS (axiomatic fuzzy set) theory and AHP (analytic hierarchy process) method, the weight of each attribute is calculated and (iii) TOPSIS (technique for order preference by similarity to ideal solution) is applied to provide the ranking order of that best combination based on the weights of attributes. In addition, we also provide the definitely semantic interpretations for the decision results by AFS theory. Specially, the model not only employs the performance parameters from raw data, but also considers the preferences from decision-makers that can make the decision results more reasonable. The proposed model is used for robot selection to verify the proposed model. Using the selection index, the evaluation of alternative robots and the selection of the most appropriate are eventually feasible. Moreover, a numerical example for supplier selection is included to illustrate the application of the model for the newly developed problems. 相似文献
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给出了求解自动化立体仓库堆垛机作业路径优化问题的一种新算法,改进的蛙跳算法.堆垛机作业路径优化是自动化立体仓库问题中重要一个环节,本身又是一个NP难题,所以对它的研究有着重要的意义.蛙跳算法,作为新的群智能优化算法,有较多优点,但目前对它的应用研究范围较窄,所以做这方面尝试性的研究.最后通过实例仿真,验证了算法的有效性.故不仅拓宽了蛙跳算法的应用范围,而且也给本身求解方法不多的堆垛机作业路径优化问题提供了一种新的解决方法. 相似文献
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确定Lotka-Volterra生态系统模型高精度参数的研究 总被引:1,自引:0,他引:1
研究确定Lotka-Volterra生态系统模型的高精度参数估计问题.利用周期性,先对测量数据进行预处理;然后用三种不同的方法构造了误差函数,进行非线性最小二乘法参数估计;再用计算机仿真对其进行验证.结果表明该方法能够有效地解决高精度参数估计中消除测量数据误差的问题. 相似文献
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Vanja Calija Andrew J. Higgins Phillip A. Jackson Leone M. Bielig Danny Coomans 《Annals of Operations Research》2001,108(1-4):123-142
Selection for superior clones is the most important aspect of sugar cane improvement programs, and is a long and expensive process. While studies have investigated different components of selection independently, there has not been a whole system approach to improve the process. This study observes the problem as an integrated system, where if one parameter changes the state of the whole system changes. A computer based stochastic simulation model that accurately represents the selection was developed. This paper describes the simulation model, showing its accuracy as well as how a combination of dynamic programming and branch and bound can be applied to the model to optimise the selection system, giving a new application of these techniques. The model can be directly applied to any region targeted by sugarcane breeding programs or to other clonally propagated crops. 相似文献