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排序方式: 共有91条查询结果,搜索用时 31 毫秒
1.
本文用最优化理论中的Powell直接法求激光粒度仪中的颗粒尺寸分布。数值模拟及对标准颗粒的实测表明,该算法的计算精度高,能较好地解决粒度仪通常存在的计算结果随初始设定值变化的多值性问题。 相似文献
2.
介绍了利用IP Filter包过滤功能在网络出口组成防火墙实现网络安全,并通过一个校园网作为实例,说明包过滤规则的制定和在IP Filter上的配置。 相似文献
3.
In this article, a new algorithm for rather expensive simulation problems is presented, which consists of two phases. In the first phase, as a model-based algorithm, the simulation output is used directly in the optimization stage. In the second phase, the simulation model is replaced by a valid metamodel. In addition, a new optimization algorithm is presented. To evaluate the performance of the proposed algorithm, it is applied to the (s,S) inventory problem as well as to five test functions. Numerical results show that the proposed algorithm leads to better solutions with less computational time than the corresponding metamodel-based algorithm. 相似文献
4.
Deniz Inan Erol Egrioglu Busenur Sarica Oykum Esra Askin Mujgan Tez 《统计学通讯:理论与方法》2017,46(22):11358-11369
In this study, a new method for the estimation of the shrinkage and biasing parameters of Liu-type estimator is proposed. Because k is kept constant and d is optimized in Liu’s method, a (k, d) pair is not guaranteed to be the optimal point in terms of the mean square error of the parameters. The optimum (k, d) pair that minimizes the mean square error, which is a function of the parameters k and d, should be estimated through a simultaneous optimization process rather than through a two-stage process. In this study, by utilizing a different objective function, the parameters k and d are optimized simultaneously with the particle swarm optimization technique. 相似文献
5.
Computational methods for complex stochastic systems: a review of some alternatives to MCMC 总被引:1,自引:0,他引:1
Paul Fearnhead 《Statistics and Computing》2008,18(2):151-171
We consider analysis of complex stochastic models based upon partial information. MCMC and reversible jump MCMC are often
the methods of choice for such problems, but in some situations they can be difficult to implement; and suffer from problems
such as poor mixing, and the difficulty of diagnosing convergence. Here we review three alternatives to MCMC methods: importance
sampling, the forward-backward algorithm, and sequential Monte Carlo (SMC). We discuss how to design good proposal densities
for importance sampling, show some of the range of models for which the forward-backward algorithm can be applied, and show
how resampling ideas from SMC can be used to improve the efficiency of the other two methods. We demonstrate these methods
on a range of examples, including estimating the transition density of a diffusion and of a discrete-state continuous-time
Markov chain; inferring structure in population genetics; and segmenting genetic divergence data. 相似文献
6.
刘慧英 《四川理工学院学报(社会科学版)》2004,19(4):61-62
作者从语音学、读诵学、语用学、修辞学的角度,对《风流歌》中的语气词"呀"和"呵"及叹词"呵"的运用进行探讨, 目的在于强调诗歌的用词规范和语用意识,以提高读诵的音准率和作品的审美效果。 相似文献
7.
Ole E. Barndorff-Nielsen & Neil Shephard 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2001,63(2):167-241
Non-Gaussian processes of Ornstein–Uhlenbeck (OU) type offer the possibility of capturing important distributional deviations from Gaussianity and for flexible modelling of dependence structures. This paper develops this potential, drawing on and extending powerful results from probability theory for applications in statistical analysis. Their power is illustrated by a sustained application of OU processes within the context of finance and econometrics. We construct continuous time stochastic volatility models for financial assets where the volatility processes are superpositions of positive OU processes, and we study these models in relation to financial data and theory. 相似文献
8.
本文提出了一种新的求解离散网络平衡设计二层规划模型的算法。模型求解中,上层问题采用粒子群算法,而下层问题则采用路径生成式logit非平衡交通分配算法。数值结果显示,本文提出的算法可以快速有效地求解这类网络平衡设计二层规划模型。 相似文献
9.
10.
本文在对五种煤灰试验结果的基础上,利用确定的飞灰磨损数学模型,建立了可以作为烟气安全流速计算基础的相对磨损量的计算公式。作者对试验结果及影响飞灰磨损的主要因素,如粒子速度、灰的磨损性能、粒度等进行了讨论。分析了飞灰磨损性能系数a与飞灰物理化学特性之间的关系;认为a值可以作为判断飞灰磨损能力的一个重要指标。 相似文献