分层服务集成架构及其关键技术的研究

本文针对异构信息系统集成问题，结合面向服务的体系结构（SOA）的设计思想和实现技术，提出了分层服务集成架构（LSI）。LSI系统考虑了从客户访问到数据获取，乃至安全认证的信息系统应用的各个层面；不同的层次解决不同的集成问题；将设计模式融入到集成架构中，使得集成各层之间达到松散耦合和良好的互操作性，并详细阐述了集成架构每一层次的支撑技术和设计、实现方法。     

Testing lack of symmetry in spatial–temporal processes

Symmetry and separability of a covariance function are common assumptions to simplify the modeling effort of spatial–temporal processes. However, many studies in environmental sciences show that real data have complex spatial–temporal dependency structures resulting from lack of symmetry or violation of other standard assumptions of the covariance function. In this study, we propose new formal tests for lack of symmetry by using spectral representations of the spatial–temporal covariance functions of regularly spaced spatial–temporal data. The advantage of the proposed tests is that classical analysis of variance (ANOVA) models can be used for detecting lack of symmetry inherent in spatial–temporal processes. We evaluate the performance of the tests with simulation studies and we apply them to air pollution data.     

Exact inference for a simple step-stress model with competing risks for failure from exponential distribution under Type-II censoring

In reliability analysis, accelerated life-testing allows for gradual increment of stress levels on test units during an experiment. In a special class of accelerated life tests known as step-stress tests, the stress levels increase discretely at pre-fixed time points, and this allows the experimenter to obtain information on the parameters of the lifetime distributions more quickly than under normal operating conditions. Moreover, when a test unit fails, there are often more than one fatal cause for the failure, such as mechanical or electrical. In this article, we consider the simple step-stress model under Type-II censoring when the lifetime distributions of the different risk factors are independently exponentially distributed. Under this setup, we derive the maximum likelihood estimators (MLEs) of the unknown mean parameters of the different causes under the assumption of a cumulative exposure model. The exact distributions of the MLEs of the parameters are then derived through the use of conditional moment generating functions. Using these exact distributions as well as the asymptotic distributions and the parametric bootstrap method, we discuss the construction of confidence intervals for the parameters and assess their performance through Monte Carlo simulations. Finally, we illustrate the methods of inference discussed here with an example.     

苏轼的"枯淡"论研究——兼论"东坡和陶诗"的文化史意义

苏轼对"平淡"风格的认识,主要体现在他对陶渊明诗歌"枯淡"美的批评上。"枯淡"风格的形成是一个"绚烂之极归于平淡"的过程,体现在陶渊明的诗歌中就是"质而实绮,癯而实腴"、"外枯而中膏,似淡而实美"的美学效果。从"枯淡"风格出发,苏轼发现了柳宗元、韦应物诗风与陶渊明"同源",并作出了"柳在韦上"的判断。苏轼还创作了大量的"和陶诗",这在中国古代文化史上具有重要的认识价值。     

Estimating the Upper Support Point in Deconvolution

Abstract.  We consider estimation of the upper boundary point F ⁻¹ (1) of a distribution function F with finite upper boundary or 'frontier' in deconvolution problems, primarily focusing on deconvolution models where the noise density is decreasing on the positive halfline. Our estimates are based on the (non-parametric) maximum likelihood estimator (MLE) of F . We show that (1) is asymptotically never too small. If the convolution kernel has bounded support the estimator (1) can generally be expected to be consistent. In this case, we establish a relation between the extreme value index of F and the rate of convergence of (1) to the upper support point for the 'boxcar' deconvolution model. If the convolution density has unbounded support, (1) can be expected to overestimate the upper support point. We define consistent estimators , for appropriately chosen vanishing sequences ( β _n ) and study these in a particular case.     

浅谈柏拉图和亚里士多德文艺理论的区别

柏拉图和亚里士多德虽有师承关系,但因哲学体系不同,形成两种不同的文艺理论倾向。把两位大师的文艺理论加以比较研究,对我们今天的文艺研究很有价值。文章将从三个方面进行阐述并以此来证明文艺理论是通过批判和斗争而发展的,亚里士多德在反对柏拉图的斗争中把文艺理论大大地推进了一步。     

Some preservation results of NBUC aging property with applications

This paper develops a new characterization of NBUC aging property, and investigates its preservation properties both under monotonic anti-star-shaped transformations and under the non-homogeneous Poisson shock models.     

粤苏辽京四省市农村土地股份合作制改革及其启示

粤苏辽京四省(市)在农村土地(社区)股份合作制改革方面走在全国的前列,富有特色性和典型性,值得参考和借鉴。本文在广泛调研的基础上,总结了四省(市)农村土地(社区)股份合作制改革的基本情况和特点,探讨了改革过程中具有规律性的东西及四省(市)经验对于推进农村土地(社区)股份合作制改革的若干启示。     

论知识经济时代图书馆功能的开发

文章从新的视角探讨了知识经济与图书馆功能的内在联系 ,提出了知识经济时代图书馆应重点开发的几个功能 :知识创新与交流功能 ;网络信息资源功能 ;继续教育功能     

"了"、"却"的语法化以及"了"、"却"的替换

汉语词汇很早就出现实词和虚词的区分。虚词大都是通过实词转变而来,通常是由于某个实词或因句法位置或者组合功能的变化而造成词义演变,或因词义的变化而引起句法位置、组合功能的改变,最终使之失去原来的意义。本文对"却"、"了"两个虚词的语法化作了一个较为详细的描写,并从历时的角度对其演变作出解释。