Analysis of MAP/M/1 queue with working breakdowns

In this paper, we analyze the MAP/M/1 queue with working breakdowns. The number of customers in the system in the steady state is obtained by the matrix geometric solution method. Then, several useful performance measures are provided. Furthermore, we show a recursive formula to obtain an approximation of stationary sojourn time. At last, we present several numerical examples.     

Generalized-order statistics with random indices

In this paper, we study the asymptotic behavior of general sequence of extreme, intermediate and central generalized-order statistics (gos), as well as dual generalized-order statistics (dgos), which are connected asymptotically with some regularly varying functions. Moreover, the limit distribution functions of gos, as well as dgos, with random indices, are obtained under general conditions.     

我国政府高成本运作的治理策略研究

从政府成本的概念出发,考察了我国政府成本的现状,揭示了我国政府高成本运作的现实,指出隐性成本过高是我国政府高成本运作的根源。分析了我国政府运作成本畸高的原因:既是政府机构固有的内在效应作用的结果,更是我国政府深层次的制度和体制层面的原因。因此切实转变政府职能,建立有效的监督制约机制,推进依法行政,以提高政府效率为核心的"政府再造"是控制和降低政府成本的根本出路。     

麟州故城城墙遗址保护研究

麟州故城为唐宋边关古城,其遗址历史悠久,规模宏大,保存良好,对研究古代政治、军事及民族关系史有着重要的价值。麟州故城城墙遗址为少数现存唐宋城墙．其保存的完整性,为我们研究古代夯土城墙和展现我国古代军事提供了重要依据。麟州故城古城墙是我国重要的文化遗产,做好古城墙的保护,不仅是对我国物质文化遗产的保护,更是对中华精神文化的保护和继承。     

离心成型钢纤维混凝土劈裂抗拉强度的尺寸效应

基于不同高度试件的劈裂抗拉试验结果,研究了离心成型中速阶段离心时间和离心加速度、骨料级配、钢纤维长度、钢纤维体积率等因素对钢纤维混凝土劈裂抗拉强度尺寸效应的影响.通过对比分析,提出了以高度为150 mm的试件为标准的劈裂抗拉强度尺寸效应换算系数,可供实际应用参考.     

Adaptive confidence intervals of desired length and power for normal means

In all empirical or experimental sciences, it is a standard approach to present results, additionally to point estimates, in form of confidence intervals on the parameters of interest. The length of a confidence interval characterizes the accuracy of the whole findings. Consequently, confidence intervals should be constructed to hold a desired length. Basic ideas go back to Stein (1945) and Seelbinder (1953) who proposed a two-stage procedure for hypothesis testing about a normal mean. Tukey (1953) additionally considered the probability or power a confidence interval should possess to hold its length within a desired boundary. In this paper, an adaptive multi-stage approach is presented that can be considered as an extension of Stein's concept. Concrete rules for sample size updating are provided. Following an adaptive two-stage design of O’Brien and Fleming (1979) type, a real data example is worked out in detail.     

残差块形自助法在非对称单位根检验中的适用性

非对称单位根检验已成为时间序列分析中重要研究领域之一。而当随机干扰项之间具有一般性的自相关时,非对称单位根检验式中,由于不同的滞后阶会对统计量检验势产生至关重要的影响,因此采用残差块形自助法（RBB）对非对称单位根EG检验进行有效的改进研究,并对RBB法的适用性进行了模拟。结果表明：RBB法不仅在一定程度上降低了检验水平扭曲,而且大大提高了EG法的检验势。     

Sample size calculation for an agreement study

It is often necessary to compare two measurement methods in medicine and other experimental sciences. This problem covers a broad range of data. Many authors have explored ways of assessing the agreement of two sets of measurements. However, there has been relatively little attention to the problem of determining sample size for designing an agreement study. In this paper, a method using the interval approach for concordance is proposed to calculate sample size in conducting an agreement study. The philosophy behind this is that the concordance is satisfied when no more than the pre‐specified k discordances are found for a reasonable large sample size n since it is much easier to define a discordance pair. The goal here is to find such a reasonable large sample size n. The sample size calculation is based on two rates: the discordance rate and tolerance probability, which in turn can be used to quantify an agreement study. The proposed approach is demonstrated through a real data set. Copyright © 2009 John Wiley & Sons, Ltd.     

The effects of board size and ‘busy’ directors on the market value of Italian companies

This paper presents evidence that corporate governance quality measured by (1) the board size and (2) the fraction of directors that serve on more corporate boards, influences the market value of firms. The analysis is based in Italy, a country that is characterized by family and concentrated ownership, low legal protection of investors and pyramidal firm structures. Our empirical results suggest that the level of ‘busy-ness’ of corporate directors as a measure of board effectiveness has a significant influence on firm’s market performance. By contrast, we find limited evidence that board size has a substantial impact on the market valuation, except in small and medium enterprises and in some specific industry sectors.

国有控股上市公司高级管理人员薪酬影响因素的实证研究

在对国有控股上市公司高级管理人员的薪酬激励效果进行理论分析的基础上,利用2006年沪深两市422家A股国有控股上市公司的年报数据,对国有控股上市公司高级管理人员薪酬的各类影响因素进行了实证分析。研究结果表明:企业业绩、公司规模、企业中是否有机构投资者、企业所处地区等因素对上市公司高级管理人员的薪酬激励效果有显著的影响,公司的成长性对上市公司高级管理人员的薪酬影响较小,高级管理人员持股总数、公司风险、国家股比例、流通股比例等因素对国有控股上市公司高级管理人员薪酬没有明显的影响。