Allocation strategies of standby redundancies in series/parallel system

This article deals with the topic of optimal allocation of two standby redundancies in a two-component series/parallel system. There are two original components C₁ and C₂ which can be used to construct a series/parallel system, and two spares R₁ (same as C₁) and R₂ (different from both C₁ and C₂) at hand with them being standby redundancies so as to enhance the reliability level of the system. The goal for an engineer is to seek after the optimal allocation policy in this framework. It is shown that, for the series structure, the engineer should allocate R₂ to C₁ and R₁ to C₂ provided that C₁ (or R₁) performs either the best or worst among all the units; otherwise, the allocation policy should be reversed. For the parallel structure, the optimal allocation strategy is just opposed to that of series case. We also provide some numerical examples for illustrating the theoretical results.     

An introduction to copula-based bivariate reliability Concepts

Several attempts were made in the literature to generalize the notions based on univariate quantiles to higher dimensions. As quantile-based reliability concepts are receiving much attention, it is important to address these problems in the field of Reliability theory. In this paper, bivariate reliability concepts using the dependence structure are introduced. The properties and characterizations of the bivariate reliability concepts are presented; it includes the characterization based on the relationship between bivariate hazard rate and bivariate mean residual life. The bivariate reliability concepts in reversed time are also studied.     

A note on stable limit theory for the OLSE with non usual rates and the heteroskedasticity robust Wald test

We are occupied with an example concerning the limit theory of the ordinary least squares estimator (OLSE) when the innovation process of the regression has the form of a martingale transform the iid part of which lies in the domain of attraction of an α-stable distribution, the scaling sequence has a potentially diverging truncated α-moment, and the regressor process has a potentially divergent truncated second moment. We obtain matrix rates that reflect the stability parameter as well as the slow variations present in the aforementioned sequences, and stable limits. We also derive asymptotic exactness, consistency, and local asymptotic unbiasedness under appropriate local alternatives for a heteroskedasticity robust Wald test based on subsampling. The results could be useful for inference on the factor loadings in an instance of the APT model.     

On the mean L1-error in the heteroscedastic deconvolution problem with compactly supported noises

We study the heteroscedastic deconvolution problem when random noises have compactly supported densities. In this context, the Fourier transforms of the densities can vanish on the real line. We propose a truncated type of estimator for target density and derive the convergence rate of the mean L¹-error uniformly over a class of target densities. A lower bound for the mean L¹-error is also established. Some simulations will be given to illustrate the performance of the proposed estimator.     

A unified approach to stochastic comparisons of multivariate mixture models

In this paper, we consider a unified approach to stochastic comparisons of random vectors corresponding to two general multivariate mixture models. These stochastic comparisons are made with respect to multivariate hazard rate, reversed hazard rate and likelihood ratio orders. As an application, results are presented for stochastic comparisons of generalized multivariate frailty models.     

社会转型期公共部门行政伦理失范及其矫正路径

随着中国政治体制改革的不断深入,公共部门管理职能逐渐由传统“管理型”向现代“服务型”过渡,对这一过程中出现的部分公职人员行政伦理失范现象,如角色冲突、权力冲突、利益冲突及法理与情理冲突等进行研究。研究认为,部分公共部门行政伦理失范现象主要与传统行政伦理思想的价值追求、行政体制自身不足、多元化价值观念的诱导及监督约束机制的不足等成因相关,要解决公共部门公职人员行政伦理失范难题,需加强行政伦理法制化建设,有效处理伦理制度化和制度伦理化及其相互关系;倡导与践行高薪养廉与社会主义核心价值观常态化教育;加强公职人员自身伦理信念教育,提出自律要求;建立治理主体多元化参与和程序公开的阳光行政体系,在全方位动态监督与引入第三方绩效评估体系来规范和激励公共部门行政人员。     

论环保部门在环境民事公益诉讼中的作用——起诉主体的正当性、可行性和合理性分析

环境公益诉讼可分为公众性环境公益诉讼和公共性环境公益诉讼两大基本类型,环保部门可作为原告提起旨在预防和救济对＂环境本身的损害＂的公共性环境民事公益诉讼。从可行性看,环保部门提起环境公益诉讼,有着国际上可资借鉴的成功经验,具有现行的法律依据和司法实践体验。环保部门务必对其提起公益诉讼的活动进行合理限制和科学设计,譬如务必以已经履行了环境监管的法定职责为前提条件,一般应作为第二顺位原告等。     

基于广义双曲线分布的人民币汇率波动性研究

针对人民币汇率的波动性问题,运用广义双曲线分布,对2006年1月4日到2015年7月24日美元兑人民币汇率的波动特征进行实证分析。研究认为,人民币汇率不仅具有显著的“尖峰厚尾”特点,而且具有波动的非对称性和集群性特征,同时发现GH分布能较为准确地描述和呈现美元兑人民币汇率收益率波动状况的分布情况。     

儿童监护事务的国家干预标准--以儿童最大利益原则为基础

儿童最大利益原则下监护事务的国家干预以司法干预为核心,发展方向从最小干预走向扩大干预,并趋于采用多元化的干预方式。司法干预的过程涉及到科学的评估,最大利益有以父母角度或者儿童角度考察者,而列清单的模式基于对相关构成要素与干扰要素的深入分析,对本原则进行司法化具有无可替代的优越性。以监护资格剥夺第一案为例,探讨儿童最大利益原则的司法适用问题,提出既需要遵守当前立法,也需要合理运用法官的自由裁量权。