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.     

一个生化反应模型的极限环唯一性

本文研究了一个仅为两个种类细胞反应的生物化学反应系统。证明了此系统只存在唯一稳定的极限环,从而发展了文献〔5〕的结果。     

论关联和照应及其之间关系

文章基于关联和照应两个概念,较为详细地阐述了关联与照应的蕴涵意义,从语用学角度加以分析,论证话语交际要达到的目的,指出:要提高人们对话语的认知,必须了解关联和照应是影响话语意义的两个主要部分,理清二者之间的关系,以使话语能够更成功地传递信息。     

邓小平理论的逻辑起点研究之我见

关于邓小平理论的逻辑起点,有多种不同的观点,比如：社会主义的本质论、社会主义的初级阶段论、真理标准论。其实,一个单一的逻辑起点是很难统摄邓小平理论所涉及到的方方面面的,我们应该分别为邓小平理论所涉及到的不同方面找出不同的逻辑起点。     

基于感知价值和参考群体的低碳旅游参与意愿测度与模拟路径

随着旅游者环境意识的不断增强,人们的消费行为对环境产生的影响也越来越受到关注。从低碳旅游感知价值和参考群体的影响作用出发,构建"90后"低碳旅游参与意愿的结构方程模型,并进行了假设的验证。研究结果表明:情感价值和社会价值对"90后"低碳旅游参与意愿具有显著的正向影响,而功能价值对这个年龄群体的低碳旅游参与意愿的显著正向影响在本文中未得到验证;主要参考群体(父母、亲戚)和次要参考群体(同学、朋友)虽然对"90后"低碳旅游参与意愿都正向影响显著,但次要参考群体的影响程度要高于主要参考群体的。研究认为,"90后"正不断成为消费的新生力量,在这个消费群体中推广低碳旅游得到的效用很重要,这种效用是从感知质量和期望绩效比较中以及短期和长期感知成本的降低中得到的。此外,发挥同学朋友的参考群体作用,也可以提高此类人群的低碳旅游参与意愿。     

An online copy number variant detection method for short sequencing reads

The availability of the next generation sequencing (NGS) technology in today's biomedical research has provided new opportunities in scientific discovery of genetic information. The high-throughput NGS technology, especially DNA-seq, is particularly useful in profiling a genome for the analysis of DNA copy number variants (CNVs). The read count (RC) data resulting from NGS technology are massive and information rich. How to exploit the RC data for accurate CNV detection has become a computational and statistical challenge. We provide a statistical online change point method to help detect CNVs in the sequencing RC data in this paper. This method uses the idea of online searching for change point (or breakpoint) with a Markov chain assumption on the breakpoints loci and an iterative computing process via a Bayesian framework. We illustrate that an online change-point detection method is particularly suitable for identifying CNVs in the RC data. The algorithm is applied to the publicly available NCI-H2347 lung cancer cell line sequencing reads data for locating the breakpoints. Extensive simulation studies have been carried out and results show the good behavior of the proposed algorithm. The algorithm is implemented in R and the codes are available upon request.     

高校图书馆数字化参考咨询服务的思考

论述了数字化参考咨询服务的概念和类型 ,并在列举了国内外几个典型的数字化参考咨询实例的基础上 ,提出了目前高校图书馆数字化参考咨询服务系统构建应具备的功能模块和服务发展方向。     

论虚拟参考咨询服务

虚拟参考咨询服务主要有电子邮件、FAQ、实时虚拟、合作虚拟等四种咨询服务模式。目前国内虚拟参考咨询服务还不够普及，还有很大发展空间，其趋势朝网络信息化和全球合作化发展。