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1.
脉冲神经膜计算系统的研究进展及展望(英文)   总被引:1,自引:1,他引:0  
脉冲神经膜计算系统是膜计算的一个新分支,不仅具有计算机科学研究意义,而且在生物建模和仿真方面有潜在的应用价值.文中介绍了脉冲神经膜计算系统的基本概念并给出了脉冲神经膜计算系统的一个例子;除了介绍标准脉冲神经膜计算系统外,还介绍若干广义的脉冲神经膜计算系统;概述了脉冲神经膜计算系统计算完备性和计算有效性两个方面的主要结果;指出了进一步研究脉冲神经膜计算系统的两个方向.  相似文献
2.
遗传算法的全局收敛性和计算效率分析   总被引:1,自引:1,他引:77  
本文应用齐次有限马尔科夫链分析了简单遗传算法、最优保存简单遗传算法和自适应遗传算法的收敛性,然后对计算效率进行了定性分析,得到了指导基因操作策略设计的极限分布概率原则。  相似文献
3.
遗传算法计算效率的改进   总被引:1,自引:1,他引:15  
根据适应值的分布, 采用缩小、移动搜索区间的方法, 将整体和局部寻优能力有机地结合起来, 明显地提高了遗传算法的收敛速度和解的精度. 本文提出的方法对大范围、高精度寻优尤其适合. 最后以连续函数为例, 说明了算法的有效性.  相似文献
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Data envelopment analysis (DEA), a performance evaluation method, measures the relative efficiency of a particular decision making unit (DMU) against a peer group. Most popular DEA models can be solved using standard linear programming (LP) techniques and therefore, in theory, are considered as computationally easy. However, in practice, the computational load cannot be neglected for large-scale—in terms of number of DMUs—problems. This study proposes an accelerating procedure that properly identifies a few “similar” critical DMUs to compute DMU efficiency scores in a given set. Simulation results demonstrate that the proposed procedure is suitable for solving large-scale BCC problems when the percentage of efficient DMUs is high. The computational benefits of this procedure are significant especially when the number of inputs and outputs is small, which are most widely reported in the literature and practices.  相似文献
6.
作为自然计算的新分支,膜计算是当前计算机科学、数学、生物学和人工智能等多学科交叉的研究热点.概述膜计算的最新动态,以一个简单膜系统为例介绍膜计算的基本概念和基本原理,从细胞型、组织型和神经型三类膜系统以及它们的计算能力和计算效率方面介绍膜计算理论研究进展,通过概括膜计算国内外应用研究成果讨论其应用前景和方向,并从软硬件发展历程分析膜系统软硬实现研究现状.最后给出有关膜计算研究的重要网络资源、热点研究领域和重点关注的问题.  相似文献
7.
为了探寻出一种求解SMB色谱模型的快速数值求解方法,并试图通过比较得出时空守恒元/解元(CE/SE)方法确实是快速数值求解方法,因而采用该方法对SMB色谱模型进行数值求解,并在数值方法的计算效率和精确度两个方面与有限差分法和正交配置有限元法进行了比较,最终得出了CE/SE方法是具有高计算效率和高精确度特性的快速数值求解方法.通过两个实例的模拟仿真,结果表明了该方法在高计算效率和高精确度方面的优越性.  相似文献
8.
Many different algorithms can be used to optimize the design of spatial measurement networks. For the spatial interpolation of environmental variables in routine and emergency situations, computation time and interpolation accuracy are important criteria to evaluate and compare algorithms. In many practical situations networks are not designed from scratch but instead the objective is to modify an existing network. The goal then is to add new measuring stations optimally or to withdraw existing stations with as little damage done as possible. The objective of this work is to compare the performance of different optimization algorithms for both computation time and accuracy criteria. We describe four algorithms and apply these to three datasets. In all scenarios the mean universal kriging variance (MUKV) is taken as the interpolation accuracy measure. Results show that greedy algorithms that minimize the information entropy perform best, both in computing time and optimality criterion.  相似文献
9.
A multi-resolution basis can provide a useful representation of nonstationary two-dimensional spatial processes that are typically encountered in the geosciences. The main advantages are its flexibility for representing departures from stationarity and importantly the scalability of algorithms to large numbers of spatial locations. The key ingredients of our approach are the availability of fast transforms for wavelet bases on regular grids and enforced sparsity in the covariance matrix among wavelet basis coefficients. In support of this approach we outline a theoretical proposition for decay properties of the multi-resolution covariance for mixtures of Matérn covariances. A covariance estimator, built upon a regularized method of moment, is straightforward to compute for complete data on regular grids. For irregular spatial data the estimator is implemented by using a conditional simulation algorithm drawn from a Monte Carlo Expectation Maximization approach, to translate the problem to a regular grid in order to take advantage of efficient wavelet transforms. This method is illustrated with a Monte Carlo experiment and applied to surface ozone data from an environmental monitoring network. The computational efficiency makes it possible to provide bootstrap measures of uncertainty and these provide objective evidence of the nonstationarity of the surface ozone field.  相似文献
10.
The simplex method has proven its efficiency in practice for linear programming (LP) problems of various types and sizes. However, its theoretical worst-case complexity in addition to its poor performance for very large-scale LP problems has driven researchers to develop alternative methods for LP problems. In this paper, we develop the hybrid-LP; a two-phase approach for solving LP problems. Rather than following a path of extreme points on the boundary of the feasible region as in the simplex method, the first phase of the hybrid-LP moves through the interior of the feasible region to obtain an improved and advanced initial basic feasible solution (BFS). Then, in the second phase simplex or other LP methods can be used to find the optimal solution.  相似文献
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