Semiparametric Bayesian classification with longitudinal markers

Summary.  We analyse data from a study involving 173 pregnant women. The data are observed values of the β human chorionic gonadotropin hormone measured during the first 80 days of gestational age, including from one up to six longitudinal responses for each woman. The main objective in this study is to predict normal versus abnormal pregnancy outcomes from data that are available at the early stages of pregnancy. We achieve the desired classification with a semiparametric hierarchical model. Specifically, we consider a Dirichlet process mixture prior for the distribution of the random effects in each group. The unknown random-effects distributions are allowed to vary across groups but are made dependent by using a design vector to select different features of a single underlying random probability measure. The resulting model is an extension of the dependent Dirichlet process model, with an additional probability model for group classification. The model is shown to perform better than an alternative model which is based on independent Dirichlet processes for the groups. Relevant posterior distributions are summarized by using Markov chain Monte Carlo methods.     

一种非周期软实时系统的缓冲设计方法

研究了任务的到达时间和执行时间均不确定的非周期软实时系统,采用排队论的分析方法,非周期软实时系统被看成是典型的随机离散事件动态系统,并被模型化为一个M/M/1/H混合制排队系统,讨论了抛弃率、截止时间错过率和平均截止时间超过量等三种性能指标,并在此基础上进行了缓冲容量的最优设计。性能分析表明缓冲设计方法能有效地改善系统的性能。     

基于财务指标的ST公司退市风险判别研究

ST类股票是股市中非常独特的一个群体,存在一定的投资价值。以ST公司的资产负债率等九项财务指标为依据,运用齐同性检验和典则判别函数,对其中的退市公司和未退市公司进行分析,发现资产负债率、应收账款周转率、资产周转率等是影响ST公司命运的主要因素,ST类股票投资者应特别关注ST公司的负债情况、经营周转情况和业务收入情况,以规避其退市风险。     

Parenting as a Dynamic Process: A Test of the Resource Dilution Hypothesis

In this paper, we tested the resource dilution hypothesis, which posits that, because parenting resources are finite, the addition of a new sibling depletes parenting resources for other children in the household. We estimated growth curve models on the self‐reported parenting practices of mothers using four waves of data collected biennially between 1994 and 2000 on a nationally representative sample of 2,082 Canadian children aged 2 to 5 at initial interview and in continuously intact, two‐biological‐parent households. Results showed that when new children were added to the household, mothers exhibited declines in positive interaction, but increased their levels of consistent parenting. Taken together, these findings suggested that parenting resources were reallocated, rather than diluted, when family size increased.     

基于利益相关者分析的工商管理专业实践教学体系

运用利益相关者矩阵分析了工商管理专业实践教学中的利益相关者之间的关系；在理论层面和过程层面指出了不同利益相关者的影响力；设计了基于实践教学理念的工商管理专业实践教学体系。     

基于逆高斯分布的项目投资风险收益理论模型

项目投资经济效果评价指标的风险分析指的是如何依据各影响因素的概率分布来推求经济效果评价指标的概率分布.本文从理论上建立了基于逆高斯分布项目投资风险收益理论模型并给予精细的分析.这对提高项目投资经济的可靠性及风险分析理论具有重要意义.     

湛江市海洋经济总产值的预测模型

运用多元回归理论,根据1990~2004年的年度数据,构建了湛江市海洋产业的总产值的预测模型,并利用MATLAB数学软件求解了预测模型,有效和系统地分析与预测了湛江未来海洋经济的发展趋势.     

法定解释实践之优先性规则：一个比较分析

法定解释是否有一种优先性或优先性规则，学界对此纷争不一。经过对各国操作性解释实践的比较分析，可以认为基本上不存在一种普遍性的优先性规则。即便是实际存在的以及理论建构的优先性规则，也是一种程序性的优先性规则，而非有关重要程度的优先性规则。     

用椭偏仪同时测定主应力差和方向

本文叙述了用衡消型(NE)、旋转检偏器型(RAE)和偏振调制型(PME)椭偏仪均能同时测定光弹性试件的主应力差和方向两个量的原理,并推导了有关的计算公式。     

医学图像分析技术及其应用的研究

信息图像化是一个受到广泛重视的研究课题,而图像的定量分析关系到图像中所包含的信息能否被很好的提取和利用.本文介绍了图像分析技术的原理及过程,着重介绍了自行研制的图像分析仪的应用实例.