在划分多种专业性作业条件下工程施工组织优化理论研究及应用

本文探讨了在考虑作业专业性条件下，工程施工组织优化的工作程序、工作目标与工作原则，在此基础上给出了一个应用实例以证明上述理论的有效性。     

过程工业故障诊断知识描述及形式化

本文根据智能工程技术，在开发过程工业集成化智能诊断软件系统的实践中，通过对过程工业故障诊断共性的分析，提出了过程工业故障诊断知识描述及形式化，研究了化工过程故障诊断浅知识模型和深知识模型的集成机制，以化工过程为例，用ＩＩＦＤＳ提供的面向对象知识表达方法，实现了一个诊断系统。     

制造业采购流程再造的理论思考

文章通过对制造业传统采购流程弊端的分析 ,提出采购流程再造的目标 ,制定企业采购流程再造的策略 ,优化采购运作模式 ,降低成本 ,提高绩效 ,满足顾客需求 ,最终提升企业的核心竞争力     

MIMO信道自适应迭代干扰抑制技术研究

针对多入多出系统,研究了共信道干扰抑制能力提高途径,提出了一种turbo均衡方案:在不改变空时编码结构、不增加接收天线数量的条件下,能极大地提高空时编码多用户系统中共信道干扰抑制能力。仿真结果显示,在存在一、二个主域共信道干扰时,该方案能明显降低误码率。     

市场微观结构、行为金融与股票价格调整:一个理论框架

从信息与价格之间的动态关系看,股票价格调整过程的本质是投资者更新信息、修正信念的过程。在投资者心理因素内生化考虑的层面上,市场微观结构理论和行为金融理论共同刻画了这一过程。市场微观结构理论基于结构性摩擦研究了交易制度对该过程的作用机理;行为金融理论基于认知偏差研究了投资者心理对该过程的作用机理。投资者认知偏差将通过信息更新和信念修正环节影响价格调整过程,并最终进入到股票价格之中。这是投资者心理在金融市场作用机理的关键所在,也是市场微观结构理论和行为金融理论有机联系的逻辑所在。     

Getting the offer: Sex discrimination in hiring

The hiring process is currently the least understood aspect of the employment relationship. It may be the most important for understanding the broad processes of stratification with allocation of demographic groups to jobs and firms. The lack of knowledge is due to difficulty of assembling data on the processes that occur at the point of hire. Against this background we analyze data on all applicants to positions in one of the largest Scandinavian banks in 1997–1998, providing what we believe to be the first study using applicant pool data and information about extended offers in a private-sector European firm, adding to the record of about half a dozen such U.S. studies. The hiring agents in the organization are fully conscious and concerned about the nonconscious biases and gender schemas they carry when making hiring decisions. Their effects on hiring are considered to be beyond dispute: women are at a clear disadvantage. For actual hiring practices we found that the opposite is true: women are not at a disadvantage and may even be at an advantage in getting offers. Two organizational practices may lead to female advantage. The hiring agents had been educated about the role of nonconscious biases, which perhaps mitigated their effects. But they had also been instructed to search actively for qualified females in the applicant pool. With no qualified females in the first pass, they go through the pool a second and third time hoping to find one. We discuss reasons why the interpretations and meanings the hiring agents attribute to the hiring process are at odds with what actually occurs.     

Factor Multivariate Stochastic Volatility via Wishart Processes

This paper proposes a high dimensional factor multivariate stochastic volatility (MSV) model in which factor covariance matrices are driven by Wishart random processes. The framework allows for unrestricted specification of intertemporal sensitivities, which can capture the persistence in volatilities, kurtosis in returns, and correlation breakdowns and contagion effects in volatilities. The factor structure allows addressing high dimensional setups used in portfolio analysis and risk management, as well as modeling conditional means and conditional variances within the model framework. Owing to the complexity of the model, we perform inference using Markov chain Monte Carlo simulation from the posterior distribution. A simulation study is carried out to demonstrate the efficiency of the estimation algorithm. We illustrate our model on a data set that includes 88 individual equity returns and the two Fama-French size and value factors. With this application, we demonstrate the ability of the model to address high dimensional applications suitable for asset allocation, risk management, and asset pricing.     

Reconsidering the Division of Household Labor: Incorporating Volunteer Work and Informal Support

The gendered division of household labor is more multifaceted than the allocation of paid work and domestic work. People also engage in volunteer work and informal support. I investigate the applicability of household labor allocation theories—specifically the time constraints, economic, and “doing gender” perspectives—to all unpaid work. I analyze the 1997 Australian Time Use Survey diaries of 1,797 married couples using logistic, ordinary least squares, and seemingly unrelated regressions. Analyses show that volunteer work and support work are substantial expenditures associated with paid work and housework, but they do not create a “third shift.” Volunteer work and support work are part of the gendered household labor allocation process determined, in part, by time constraints and by gender.     

汉代关税问题再探讨

在汉代的关税问题上 ,学术界观点纷呈 ,据有关资料 ,对汉代关税征收时间、税率等问题进行较为详尽的考订 ,认为汉关税的正式征收应始于高祖 ,文帝时一度中断 ,景帝时恢复。汉代关税苛重 ,不统一、不规范是其特点。     

Doubly periodic non-homogeneous Poisson models for hurricane data

Non-homogeneous Poisson processes with periodic claim intensity rate have been proposed as claim counts in risk theory. Here a doubly periodic Poisson model with short- and long-term trends is studied. Beta-type intensity functions are presented as illustrations. The likelihood function and the maximum likelihood estimates of the model parameters are derived.Doubly periodic Poisson models are appropriate when the seasonality does not repeat exactly the same short-term pattern every year, but has a peak intensity that varies over a longer period. This reflects periodic environments like those forming hurricanes, in alternating El Niño/La Niña years. An application of the model to the data set of Atlantic hurricanes affecting the United States (1899–2000) is discussed in detail.