交易延迟与机构投资者交易策略研究

对于机构投资者而言,出清具有一定规模的证券时,其提交指令的行为将对证券价格造成冲击形成交易成本,之后指令执行延迟也造成交易成本。文章以既定风险厌恶的机构投资者为研究对象,探讨其在交易延迟下的最优指令提交策略。经研究表明:交易延迟下最优指令提交策略受风险态度、证券收益、证券价格的波动性、市场的流动性与深度以及瞬时冲击程度等参数影响,不同市场的情况要求机构投资者调整策略,改变指令提交过程。     

从供应链分析探讨传统出口型外贸企业的发展战略

从分析传统外贸企业在国际供应链中的地位入手,研究了传统外贸企业的现有功能和功能扩展空间,从而提出传统外贸企业应该坚持加强供应链管理、加强战略合作伙伴关系的建设,并努力实现信息化的战略发展方向。     

Accelerated test system strength models based on Birnbaum–Saunders distribution: a complete Bayesian analysis and comparison

Several models for studies related to tensile strength of materials are proposed in the literature where the size or length component has been taken to be an important factor for studying the specimens’ failure behaviour. An important model, developed on the basis of cumulative damage approach, is the three-parameter extension of the Birnbaum–Saunders fatigue model that incorporates size of the specimen as an additional variable. This model is a strong competitor of the commonly used Weibull model and stands better than the traditional models, which do not incorporate the size effect. The paper considers two such cumulative damage models, checks their compatibility with a real dataset, compares them with some of the recent toolkits, and finally recommends a model, which appears an appropriate one. Throughout the study is Bayesian based on Markov chain Monte Carlo simulation.     

A specification strategy for order determination in arma models

In this paper a specification strategy is proposed for the determination of the orders in ARMA models. The strategy is based on two newly defined concepts: the q-conditioned partial auto-regressive function and the p-conditioned partial moving average function. These concepts are similar to the generalized partial autocorrelation function which has been recently suggested for order determination. The main difference is that they are defined and employed in connection with an asymptotically efficient estimation method instead of the rather inefficient generalized Yule-Walker method. The specification is performed by using sequential Wald type tests. In contrast to the traditional testing of hypotheses, these tests use critical values which increase with the sample size at an appropriate rate     

Bayes Analysis and Comparison of Accelerated Weibull and Accelerated Birnbaum–Saunders Models

Several models are proposed in the literature for modeling fatigue data resulting from materials subject to cyclic stress and strain. Accelerated Weibull and accelerated Birnbaum–Saunders distributions are most commonly used models. Whereas the accelerated Weibull model is easier compared to accelerated Birnbaum–Saunders, it fails to represent the situation equally well. The present article focuses on Bayes analysis of the two models and provides a comparison based on some important Bayesian tools. Model compatibility study using predictive simulation ideas is preceded by the said comparison. Throughout, the posterior simulations are carried out by Markov chain Monte Carlo procedure.     

Estimation of a finite population total in two-stage and stratified sampling under superpopulation models

Optimal sampling strategies which minimise the expected mean square error for a linear design as well as model-design unbiased estimators for a finite population total for two-stage and stratified sampling are obtained under different superpopu1ation models     

中国企业呼唤敏捷制造战略

本文简述了敏捷制造战略的主要思想,指出在中国实施敏捷制造战略是当务之急。为此,需要从中国制造业的实际出发解决敏捷化的制造单元技术,以敏捷方式集成制造单元等关键问题。本文认为中国的敏捷化制造单元的构建可基于独立制造岛,提出了以虚拟企业方式实施中国的集团化经营战略的设想。     

基于QFD矩阵的竞争战略决策框架

借助于全面质量管理理论中的QFD矩阵,本文提出了一种顾客导向的竞争战略决策框架,它有效地将内部竞争能力与外部竞争要素放在一起进行分析与决策。文中还进一步探讨了其中的竞争要素的特征以及竞争冲击曲线理论,为有效地作出竞争战略决策提供了基础。     

“流氓软件”的分析及防治策略

探讨"流氓软件"与正规软件及病毒之间的区别,可知"流氓软件"目前主要的种类,在分析其特征、入侵的方法及产生危害的原理基础上,提出了对"流氓软件"的防治应采取"预防为主,防清并举,联合互动"立体防御策略,并给出多种针对不同时期不同层次上的具体防治措施,为用户端的"流氓软件"有效防治提供了一些新思路和新方法,具有一定的参考价值。     

医学科研项目的风险管理对策研究

医学科研项目存在着投入资金高、研发周期长、失败率高以及实验环节多等特点,其研究结果往往具有不确定性和不可预期性,因此,有必要从项目的风险角度来进行管理,以规避项目过程的风险.文章旨在对医学科研项目风险成因分析的基础上,较为系统地提出项目风险管理对策.根据项目实施流程,设计医学科研项目风险管理流程,具体分析了立项、实施、结题的不同阶段其风险管理的特点,以期为我国逐步形成医学科研项目风险管理的科学方法提供有益的理论参考.