Distribution of residual autocorrelations for multiplicative seasonal ARMA models with uncorrelated but nonindependent error terms

In this paper, we consider portmanteau tests for testing the adequacy of multiplicative seasonal autoregressive moving‐average models under the assumption that the errors are uncorrelated but not necessarily independent. We relax the standard independence assumption on the error terms in order to extend the range of applications of the seasonal autoregressive moving‐average models. We study the asymptotic distributions of residual and normalized residual empirical autocovariances and autocorrelations under weak assumptions on noise. We establish the asymptotic behavior of the proposed statistics. A set of Monte Carlo experiments and an application to monthly mean total sunspot number are presented.     

试论证券投资者利益的保护

我国证券市场是一个不太成熟的市场,证券投资者的利益经常受到侵害。要保护投资者的利益,必须建立规范的社会信用体系,防止信用缺失,规范政府行为,改变“政策市”形象,提高证券投资者自身素质,学会理性投资。     

海洋工程项目中物资追踪管理研究

本文通过研究海洋工程项目的建造特点,阐述了如何使用批次管理方法对海洋工程物资进行管理。在海洋工程项目的建造过程中,通过对物资的批次进行追踪达到对物资的管理,能够简化物资追踪过程、提高物资追踪精度,达到提高质量、节约成本、缩短周期的目的。     

普通SBR生物脱氮工艺的效果分析

通过对生产性普通SBR生化反应器的运行数据,结合有关废水处理原理,从有机负荷、混合液悬浮固体(MLSS)、DO的角度进行系统的分析与研究,考察其生物脱氮最佳工艺运行条件。     

The price normalization problem in imperfect competition and the objective of the firm

Summary. General equilibrium models of oligopolistic competition give rise to relative prices only without determining the price level. It is well known that the choice of a numéraire or, more generally, of a normalization rule converting relative prices into absolute prices entails drastic consequences for the resulting set of Nash equilibria when firms are assumed to maximize profits. This is due to the fact that changing the price normalization amounts to altering the objective functions of the firms. Clearly, the objective of a firm must not be based on price normalization rules void of any economic content. In this paper we propose a definition of the objective of a firm, called maximization of shareholders' real wealth, which takes shareholders' demand explicitly into account. This objective depends on relative prices only. Real wealth maxima are shown to exist under certain conditions. Moreover, we consider an oligopolistic market and prove the existence of a Nash equilibrium in which each firm maximizes the real wealth of its shareholders. Received: July 10, 1997; revised version: July 27, 1998     

允许重启的最大化按时完工数的分批在线排序

我们考虑允许重启的分批在线排序模型,目标值是最大化按时完工数。就等长工件情形下,当批容量为无限时给出一个竞争比为的在线算法;当批容量有限时给出一个竞争比为的在线算法。     

Two‐level CES Production Technology in the Solow and Diamond Growth Models*

The two‐level CES aggregate production function—that nests a CES into another CES function—has recently been used extensively in theoretical and empirical applications of macroeconomics. We examine the theoretical properties of this production technology and establish existence and stability conditions of steady states under the Solow and Diamond growth models. It is shown that in the Solow model the sufficient condition for a steady state is fulfilled for a wide range of substitution parameter values. This is in sharp contrast with the two‐factor Solow model, where only an elasticity of substitution equal to one is sufficient to guarantee the existence of a steady state. In the Diamond model, multiple equilibria can occur when the aggregate elasticity of substitution is lower than the capital share. Moreover, it is shown that for high initial levels of capital and factor substitutability, the effect of a further increase in a substitution parameter on the steady state depends on capital–skill complementarity.     

小批量生产制造业的成本控制研究

降低成本和提高企业的经济效益是成本控制的主要目的。本文主要通过对小批量制造业成本控制存在的问题进行分析,来提出相应的解决方案。     

基于Asp.net/.Net Web Service的高职院校毕业生就业上报信息管理系统的设计与实现

信息化建设是提高工作效率的有效途径,文章针对当前高职院校的毕业生就业上报信息管理、统计等工作存在效率低、工作量大、录入人员对毕业生不熟悉,以及院校的就业部门不能很好地与各个系部进行信息实时沟通、共享等问题,介绍了一种基于Asp.net/.Net Web Service技术开发的高职院校毕业生就业上报信息管理系统,该系统能较好地解决上述问题。     

基于供应商入侵的两级供应链批量博弈及决策

考虑由一个供应商和一个零售商组成的两级供应链,构建了三阶段博弈模型,研究在不对称信息下供应商入侵对零售商订单量及供应商库存量决策的影响。通过设计市场规模阈值及调查市场规模,进而得出每一阶段下供应商和零售商的利润。对3个阶段供应商和零售商利润先后进行比较分析,发现当后一阶段利润大于前一阶段时,供应链成员才会对订单量及库存量进行调整,从而得出在每阶段零售商订单数量及供应商库存数量范围。结果表明,供应商入侵在一定的零售商订单量及供应商库存量范围内可以提高供应链利润。