双耦合腔链慢波系统的色散分析

采用模拟场方法对由二隙缝耦合腔链所构成的“捆扎式”双通道慢波系统进行了分析,得到该结构的色散方程及耦合阻抗的变化趋向,并与传统单耦合腔链慢波结构的色散特性进行了比较。     

Estimation of critical points in the mixture inverse Gaussian model

The maximum likelihood estimation for the critical points of the failure rate and the mean residual life function are presented in the case of mixture inverse Gaussian model. Several important data sets are analyzed from this point of view. For each of the data sets, Bootstrapping is used to construct confidence intervals of the critical points.     

投资基金绩效评价的Sharpe 指数与 衰减度实证分析

采用国际上基金业绩评价中普遍采用的Sharpe指数,对中国证券投资基金的业绩进行实证研究;针对Sharpe指数在基金收益非正态分布时的缺陷,采用Stutzer(2000)提出的衰减度对中国证券投资基金进行实证分析.实证分析说明,衰减度和Sharpe指数相比,在基金收益呈正态分布时,基金业绩排序一致;在基金收益呈非正态分布时,衰减度可根据基金收益高阶统计量(偏度,峰度)进行修正.另外,该研究表明根据衰减度参数θ的大小进行排序对基金绩效评价是有参考价值的.     

中国企业年金缴费率的模拟分析

企业年金在多支柱养老保险体系中发挥着越来越重要的作用.以个人账户为研究对象,为我国企业年金建立了精算平衡模型.文章在精算平衡模型的基础上,运用模拟的方法,对企业年金的缴费率进行了测算分析.并根据模拟的结果,对2004年5月1日开始实施的<企业年金试行办法>中缴费率的规定进行了讨论,为企业年金的发展和政策制定提供了建议.     

A general long-term aging model with different underlying activation mechanisms: Modeling,Bayesian estimation,and case influence diagnostics

In this paper we propose a general cure rate aging model. Our approach enables different underlying activation mechanisms which lead to the event of interest. The number of competing causes of the event of interest is assumed to follow a logarithmic distribution. The model is parameterized in terms of the cured fraction which is then linked to covariates. We explore the use of Markov chain Monte Carlo methods to develop a Bayesian analysis for the proposed model. Moreover, some discussions on the model selection to compare the fitted models are given, as well as case deletion influence diagnostics are developed for the joint posterior distribution based on the ψ-divergence, which has several divergence measures as particular cases, such as the Kullback–Leibler (K-L), J-distance, L₁ norm, and χ²-square divergence measures. Simulation studies are performed and experimental results are illustrated based on a real malignant melanoma data.     

Generalized Kerridge’s inaccuracy measure for conditionally specified models

Recently, conditional Renyi’s divergence of order α and Kerridge’s inaccuracy measures are studied by Navarro et al. (2014 Navarro, J., Sunoj, S.M., Linu, M.N. (2014). Characterizations of bivariate models using some dynamic conditional information divergence measures. Commun. Stat. Theory Methods 43:1939–1948.[Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]). In the present article, a generalized dynamic conditional Kerridge’s inaccuracy measure is introduced, which can be represented as the sum of conditional Renyi’s divergence and Renyi’s entropy. Some useful bounds are obtained using the concept of likelihood ratio order. The results are extended to weighted distributions. Sufficient conditions are obtained for the monotonicity of the proposed measure. Characterizations for bivariate exponential conditional distribution are presented based on the proposed measure.     

A new confidence interval in measurement error model with the reliability ratio known

For the slope parameter of the measurement error model with the reliability ratio known, this article constructs a fiducial generalized confidence interval (FGCI) which is proved to have correct asymptotic coverage. Simulation results demonstrate that the FGCI often outperforms the existing intervals in terms of empirical coverage probability, average interval length, and false parameter coverage rate. Two examples are also provided to illustrate our approach.     

On a system of nonhomogeneous components sharing a common frailty

The components of a reliability system subjected to a common random environment usually have dependent lifetimes. This paper studies the stochastic properties of such a system with lifetimes of the components following multivariate frailty models and multivariate mixed proportional reversed hazard rate (PRHR) models, respectively. Through doing stochastic comparison, we devote to throwing a new light on how the random environment affects the number of working components of a reliability system and on assessing the performance of a k-out-of-n system.     

阻沙率在沙漠公路高大沙丘段防沙体系设计中的应用

在工程防沙设计中，阻沙率和输沙强度均是确定防护类型及其宽度的重要指标。从工程实际出发，结合典型地形特征，运用实测的阻沙率指标，优化沙漠公路高大沙丘段防沙体系的设计，用理论指导实践的同时，并在实践施工中加以较好地运用，从实践效果上，以阻沙率这一风沙物理指标为依据，确定高大沙丘段的防沙设计参数，是符合实际和可行的方法。     

How national identification matters: the development of European identification among established ethnic minority groups

Based upon the data from qualitative studies of eight national minorities between the Baltic and the Danube, this article investigates the formation of European identification among members of the minority groups representing ‘split nations’ along the new eastern borders of the enlarged EU. The analysis reveals mechanisms of the formation of supranational identification by focusing on the relationships between subnational, national and European identifications to ascertain the degree of interconnectedness of these identification levels. These relationships are examined in the context of the potential impact of perceived ethnic conflict and utilitarian expectations of socio-economic and cultural gains from the process of European integration.