Information matrix for a mixture of two inverse gaussian distributions

In this paper, Fisher information matrix about the five parameters ρ, μ_:1, μ², λ¹and λ²of a mixture of two Inverse Gaussian density functions is obtained. The Leguerre-Gauss quadrature formula is used to evaluate the essential integral on which the twenty five elements of the information matrix are based. Results involving the computation of the information about p are compared with those involving both the power series expansion and Simpson's method of integration. Laguerre-Gauss quadra-ture was found to lead to good approximations as compared with other methods. It was therefore chosen for the computations of the elements of the information matrix.     

环境殖民主义批判

环境殖民主义是资本主义殖民本性在环境领域的体现和拓展。为了维持资本主义生产生活方式,发达国家不仅掠夺发展中国家的能源资源与原料燃料等,还通过多种方式把有毒有害废弃物和垃圾输往广大发展中国家。环境殖民根源于资本的求利本性和全球扩张,资本主义生态理性与经济理性存在不可调和的矛盾。我国应以科学的态度对待环境殖民主义。     

Flows and Cohesion: Balancing Capabilities Across an Expanded Union1

Until recently the flow of skilled workers to established centres from more peripheral regions was seen as a ‘brain drain’, implying a one‐way and permanent loss of skilled labour. However, increasing mobility and connectivity permits more complex traffic between more and less advanced locations. With the emergence of a global economy dependent on flows of material and intellectual capital, the notion of ‘brain circulation’ has gained prominence. Understanding the potential benefits of migration to both donor and recipient economies must move beyond financial remittance to social remittance. As connectivity increases, both become capacity‐building resources. This article discusses the impact of a combination of greater physical mobility and electronic connectivity on the dual objectives of social cohesion and technical leadership being pursued through the policies of the European Commission.     

现代化进程中古城风貌的保护与延伸

在现代化进程中古城风貌保护与延伸的理论与对策应是社会学学者所关注的一个问题。古城应在动态中进行“城市性格”保护和延伸,在宏观上分异城市功能,在微观上注重“修旧如旧”和“点、线、面”的三位一体,城市社区的建设问题可以在保护和延伸中协调解决。     

住房市场系统模型研究

从宏观层面建立了包含银行、地产商及消费者在内的住房市场系统模型,重点考虑了信贷对住房市场供需双方的金融支持,构建了住房市场系统的定量分析框架,该框架对于银行主导的住房市场具有一般性。通过中国住房市场的实证分析,证实了模型的有效性。     

胀接对管板强度的加强效应

由于胀接使列管与管板紧密连接，管壁厚度的部分或全部可以考虑在管桥 宽度中.本文通过数值计算分析了胀接对管板强度的加强效应.     

Bootstrap confidence regions computed from autoregressions of arbitrary order

Given a linear time series, e.g. an autoregression of infinite order, we may construct a finite order approximation and use that as the basis for confidence regions. The sieve or autoregressive bootstrap, as this method is often called, is generally seen as a competitor with the better-understood block bootstrap approach. However, in the present paper we argue that, for linear time series, the sieve bootstrap has significantly better performance than blocking methods and offers a wider range of opportunities. In particular, since it does not corrupt second-order properties then it may be used in a double-bootstrap form, with the second bootstrap application being employed to calibrate a basic percentile method confidence interval. This approach confers second-order accuracy without the need to estimate variance. That offers substantial benefits, since variances of statistics based on time series can be difficult to estimate reliably, and—partly because of the relatively small amount of information contained in a dependent process—are notorious for causing problems when used to Studentize. Other advantages of the sieve bootstrap include considerably greater robustness against variations in the choice of the tuning parameter, here equal to the autoregressive order, and the fact that, in contradistinction to the case of the block bootstrap, the percentile t version of the sieve bootstrap may be based on the 'raw' estimator of standard error. In the process of establishing these properties we show that the sieve bootstrap is second order correct.     

基于语义扩展的数字图书馆知识推荐系统

构建个性化知识推荐系统是数字图书馆实现个性化信息服务的有效手段,推荐服务的关键在于完整地理解用户兴趣并准确作出推荐.文章提出了一种基于语义扩展的知识推荐方法,通过分析读者文献检索、浏览的行为提取读者偏好.利用扩展激活模型扩充读者偏好档案,对文献信息资源进行匹配和分级,通过文献的级别决定推荐的次序,对推荐信息进行反馈,动态更新读者的偏好档案.     

Hypotheses testing for a multidimensional parameter of inhomogeneous Poisson processes

We observe a realization of an inhomogeneous Poisson process whose intensity function depends on an unknown multidimensional parameter. We consider the asymptotic behaviour of the Rao score test for a simple null hypothesis against the multilateral alternative. By using the Edgeworth type expansion (under the null hypothesis) for a vector of stochastic integrals with respect to the Poisson process, we refine the (classic) threshold of the test (obtained by the central limit theorem), which improves the first type probability of error. The expansion allows us to describe the power of the test under the local alternative, i.e. a sequence of alternatives, which converge to the null hypothesis with a certain rate. The rates can be different for components of the parameter.     

高职机电专业教学资源建设研究

通过对吉林地区人才需求分析,为促进学生职业能力的可持续发展,研究以就业为导向,构建突出职业能力的课程体系;"竞、技、协"相结合,构建个性化能力培养平台;校企共建虚实结合的教学资源,以提高人才培养质量。