二维小波变换在虹膜特征提取中的应用研究

本文提出了一种采用canny变换来提取虹膜特征,并用小波神经网络来进行分类的虹膜检测识别的新方法。该方法结合了小波神经网络作为一种新的分类方法,它很好地改进了识别精度,同时提高了系统的性能。一个简洁并且能快速训练的算子Adaboost也将在小波神经网络中给出介绍。实验结果表明,应用该算子进行分类识别时,识别率为100%,该方法具有很高效的可行性。     

A Note on the Characterization of Positive Linnik Laws

Recently, Jayakumar & Pillai (1996) gave an interesting characterization of the positive Linnik laws in terms of the spectrum function of an infinitely divisible law. This paper improves their result and simplifies their proof. It proves another characterization result in terms of the Pareto law. Further, it represents the positive Linnik random variable as a function of independent gamma random variables.     

医患关系的变化与医院的可持续发展

医疗体制改革的深入和市场经济的发展使医患关系发生了巨大变化 ,医患关系变成了法律或合同关系、经营者与消费者关系 ,患者已从过去的求医变成了现在的选择医生。如何应对这些变化 ?作者认为 ,医务人员应通过转变观念、依法行医、给患者提供优质服务等来建立市场经济条件下的融洽、相互信赖与尊重的新型医患关系     

A multi-resolution census algorithm for calculating vortex statistics in turbulent flows

Summary.  The fundamental equations that model turbulent flow do not provide much insight into the size and shape of observed turbulent structures. We investigate the efficient and accurate representation of structures in two-dimensional turbulence by applying statistical models directly to the simulated vorticity field. Rather than extract the coherent portion of the image from the background variation, as in the classical signal-plus-noise model, we present a model for individual vortices using the non-decimated discrete wavelet transform. A template image, which is supplied by the user, provides the features to be extracted from the vorticity field. By transforming the vortex template into the wavelet domain, specific characteristics that are present in the template, such as size and symmetry, are broken down into components that are associated with spatial frequencies. Multivariate multiple linear regression is used to fit the vortex template to the vorticity field in the wavelet domain. Since all levels of the template decomposition may be used to model each level in the field decomposition, the resulting model need not be identical to the template. Application to a vortex census algorithm that records quantities of interest (such as size, peak amplitude and circulation) as the vorticity field evolves is given. The multiresolution census algorithm extracts coherent structures of all shapes and sizes in simulated vorticity fields and can reproduce known physical scaling laws when processing a set of vorticity fields that evolve over time.     

Ruin Probabilities for the Perturbed Compound Poisson Risk Process with Investment

In this article, we consider the perturbed compound Poisson risk process with investment incomes. The risk reserve process is perturbed by an independent Brownian motion and the surplus is invested at a constant force of interest. We investigate the asymptotic behavior of the ruin probability as the initial reserve goes to infinity. Bounds and time-dependent bounds are derived for the ultimate ruin probability and the probabilities of ruin within finite time, respectively. We also obtain an explicit expression for the Laplace transform of the ultimate ruin probability.     

电视机声控关机电路

设计了一种在电视节目结束时，能自动关机的电路，以达到节约电能，延长电视机寿命的目的     

中国农村改革与社会转型对农村文化建设的影响

建国以来我国农村社会的改革 ,特别是当代中国农村的经济体制和政治体制改革 ,使中国农村发生了深刻变化 ,农民的思想意识、价值观念、思维方式、生活方式和社会心态发生了历史性的变化 ,从而对农村文化建设产生多维的深刻影响     

美国中东“民主化”改造战略初探

为了从"根本"上铲除恐怖主义滋生的温床,从政治、经济、思想、文化等方面对中东国家和伊斯兰世界实施控制,伊拉克战争后,美国推出了国际性计划即"大中东民主计划",旨在通过外交、文化、经济改革,以美式民主和价值观遏制、淡化伊斯兰教的影响."中东民主化改造"是美国独霸世界战略的重要组成部分,它的出台和实施必将震荡国际社会.     

美国中东“民主化”改造战略初探

为了从"根本"上铲除恐怖主义滋生的温床,从政治、经济、思想、文化等方面对中东国家和伊斯兰世界的实施控制。伊拉克战争后,美国推出了国际性计划即:"大中东民主计划",旨在通过外交、文化、经济改革,以美式民主和价值观遏制、淡化伊斯兰教的影响。"中东民主化改造"是美国独霸世界战略的重要组成部分,它的出台和实施必将震荡国际社会。     

Testing for additivity and joint effects in multivariate nonparametric regression using Fourier and wavelet methods

We consider the problem of testing for additivity and joint effects in multivariate nonparametric regression when the data are modelled as observations of an unknown response function observed on a d-dimensional (d 2) lattice and contaminated with additive Gaussian noise. We propose tests for additivity and joint effects, appropriate for both homogeneous and inhomogeneous response functions, using the particular structure of the data expanded in tensor product Fourier or wavelet bases studied recently by Amato and Antoniadis (2001) and Amato, Antoniadis and De Feis (2002). The corresponding tests are constructed by applying the adaptive Neyman truncation and wavelet thresholding procedures of Fan (1996), for testing a high-dimensional Gaussian mean, to the resulting empirical Fourier and wavelet coefficients. As a consequence, asymptotic normality of the proposed test statistics under the null hypothesis and lower bounds of the corresponding powers under a specific alternative are derived. We use several simulated examples to illustrate the performance of the proposed tests, and we make comparisons with other tests available in the literature.