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1.
实际信号的混合均为卷积混合,且信号是非平稳的。盲源分离的目标就是找到一组分离滤波器,使得源信号的估计信号互相统计独立。结合信号的非平稳性,利用二阶解相关原理,文章阐明了一种在频域实现卷积混合的盲源分离算法,并且考虑了噪声对分离性能的影响。为了避免频点排列次序的不确定性,利用了多阶段盲源分离思想。利用该算法,对两路混合的实录水声信号进行盲分离,得到了两路源信号的估计信号,通过对估计信号的分析,利用信噪比提高率这一标准,验证了该算法的有效性。该算法收敛速度快,精度高,可用于浅海环境下实录水声混合信号的盲分离。 相似文献
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Asger Hobolth Jan Pedersen Eva B. Vedel Jensen 《Journal of Mathematical Imaging and Vision》2002,17(2):131-137
This paper suggests a high-level continuous image model for planar star-shaped objects. Under this model, a planar object is a stochastic deformation of a star-shaped template. The residual process, describing the difference between the radius-vector function of the template and the object, is allowed to be non-stationary. Stationarity is obtained by a time change. A parametric model for the residual process is suggested and straightforward parameter estimation techniques are developed. The deformable template model makes it possible to detect pathologies as demonstrated by an analysis of a data set of cell nuclei from a benign and a malignant tumour, using stochastic deformations of ellipses. 相似文献
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Chow Sy-Miin; Haltigan John D.; Messinger Daniel S. 《Canadian Metallurgical Quarterly》2010,10(1):101
We examined dynamic infant–parent affect coupling using the Face-to-Face/Still-Face (FFSF). The sample included 20 infants whose older siblings had been diagnosed with Autism Spectrum Disorders (ASD-sibs) and 18 infants with comparison siblings (COMP-sibs). A series of mixed effects bivariate autoregressive models was used to represent the self-regulation and interactive dynamics of infants and parents during the FFSF. Significant bidirectional affective coupling was found between infants and parents, with infant-to-parent coupling being more prominent than parent-to-infant coupling. Further analysis of within-dyad dynamics revealed ongoing changes in concurrent infant–parent linkages both within and between different FFSF episodes. The importance of considering both inter- and intradyad differences is discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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Examining spatially varying relationships between land use and water quality using geographically weighted regression I: model design and evaluation 总被引:11,自引:0,他引:11
Traditional regression techniques such as ordinary least squares (OLS) can hide important local variations in the model parameters, and are not able to deal with spatial autocorrelations existing in the variables. A recently developed technique, geographically weighted regression (GWR), is used to examine the relationships between land use and water quality in eastern Massachusetts, USA. GWR models make great improvements of model performance over OLS models, which is proved by F-test and comparisons of model R2 and corrected Akaike Information Criterion (AICc) from both GWR and OLS. GWR models also improve the reliabilities of the relationships by reducing spatial autocorrelations. The application of GWR models finds that the relationships between land use and water quality are not constant over space but show great spatial non-stationarity. GWR models are able to reveal the information previously ignored by OLS models on the local causes of water pollution, and so improve the model ability to explain local situation of water quality. The results of this study suggest that GWR technique has the potential to serve as a useful tool for environmental research and management at watershed, regional, national and even global scales. 相似文献
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本文建立了一个非平稳随机模型,研究了扰动为非平稳随机过程时,对水质预测的影响,并对模型的统计特性进行了分析,最后给出了一个扰动为白噪声时实例。 相似文献
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Abstract. Box and Tiao (1977) established the correspondence between non-stationary roots and canonical correlations of an AR(1) process. In this paper, we give an alternative, more direct, proof of the correspondence and extend a special case of that result to AR( p ) processes. The usefulness of these results for multiple time series modelling is also briefly discussed. 相似文献
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在假定结构体系受到非均匀调制的演变随机激励基础上,考虑到地震动强度和频谱非平稳特性,应用等效线性化方法分析了土-结构相互作用体系在演变随机激励下的响应演变谱和时变均方根响应,给出了一种实用计算方法,再通过示例叙述了此方法的实施过程。计算结果表明,地震动频谱非平稳特性对非线性相互作用体系响应有较大的影响。 相似文献
9.
全球气候变化背景下的防洪安全影响是国际国内关注的热点问题。随着气候变暖、城镇化快速发展对地区强降水、洪涝等极端事件的影响,未来我国防洪安全保障将面临新的挑战。本文针对中国面临的严重洪涝灾害问题,阐述了全球到中国气候变化对洪涝灾害影响的事实,综述了国际国内最新的研究进展与前沿问题。最后提出了为应对气候变化减少洪涝灾害的若干对策与建议,为未来中国开展气候变化影响下防洪安全研究提供借鉴。 相似文献
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近年来,我国有大批桥梁得以新建。与此同时,日益增加的车辆荷载使得在役桥梁面临着更大的服役风险。在已有研究中,桥梁结构的可靠度评估将车载随机过程看作平稳泊松过程,且假定荷载效应概率模型在评估期内独立同分布。历史数据表明,我国的汽车荷载存在明显的逐年增加的趋势,随时间不再服从同一分布,已有方法也不再适用。为此,该文改进了已有方法,提出了考虑非平稳车载过程的在役桥梁时变可靠度评估新方法。算例表明,改进的方法简便易行,结果准确。已有方法可看作是该文改进方法的特例。随后,利用这一方法研究了结构可靠度对车载随机过程参数的敏感性。结果表明,车载随机过程参数对结构可靠度的影响显著。在20年的评估期内,均值每年增加1.1%或标准差每年增加1.3%,都会造成结构的失效概率增大两倍。 相似文献