Lifestyle Options and Economic Strategies: Subsistence Activities in the Mississippi Delta1

Abstract "Subsistence" and "informal economy" are contrasted in their utility as sociological concepts and their ability to explain a variety of activities in two rural Mississippi Delta communities. Literature on subsistence stresses that the desired outcome of participation is not an increase in income but the social rewards of participation itself. Two underlying dimensions of participation in these activities are documented through the literature and through a confirmatory factor analysis of empirical data: life-style choice and economic strategy. These were constructed into indexes and examined individually and in combination as dependent variables using regressors at the community, household, and individual levels. Community ties were weakly associated with participation in such activities. Whites and those with higher incomes participated more in lifestyle choice oriented activities. Participation in general was statistically related to households needing less weekly income and being of larger size. Potential connections with persistent rural poverty are discussed.     

我国西南民族地区与东部地区农村发展差距研究

比较分析我国西南民族地区与东部地区农村发展差距及原因,提出缩小农村发展差距的对策。     

Flow shop scheduling with deteriorating jobs under dominating machines

This paper addresses no-wait or no-idle flow shop scheduling problems with deteriorating jobs, i.e., jobs whose processing times are an increasing function of their starting time. A simple linear deterioration function is assumed and some dominating relationships between machines can be satisfied. It is shown that for the problems to minimize makespan or weighted sum of completion time, polynomial algorithms still exist, although these problems are more complicated than the classical ones. When the objective is to minimize maximum lateness or maximum tardiness, the solutions of a classical version may not hold.     

基于Nash均衡约束的竞争性评估方法研究

基于多指标决策模型(MCDM),研究了在Nash均衡约束的基础上,如何根据各决策单元(DMU)本身的特点来获取不同DMU的优势权重从而达到最终决策时自身的优势最大化.从新的角度,引入Nash均衡约束,提出了基于Nash均衡约束的多指标决策竞争性评估模型.在主体自身优势最大化的基础上,增加Nash均衡约束,通过约束参数的不断迭代,达到各决策单元的优势均衡,给出了一种新的基于优势均衡的客观确定权重的方法.     

遗传算法优化神经网络及信用评价研究

研究关于公司神经网络信用评估问题的现状,提出遗传算法辅助网络训练策略(优化后的网络称为进化网络),克服传统网络建模中产生的局部极小缺陷。建立了适合于我国商业企业的信用评分指标体系;然后依据该指标体系建立了基于进化神经网络的信用评估模型;最后,利用样本公司实际指标数据对该模型的评分效果进行了比较研究。     

国有股和法人股对公司业绩的影响--公用事业型上市公司的实证研究

公司的股份集中于少数几个大股东手中是中国公司股权结构的一个普遍特征,研究这些大股东如何凭借其持股地位影响公司业绩是中国公司股权结构研究的一个非常重要的问题.本文选取了在上交所上市的公用事业型公司1998年至2002年的平行数据进行实证研究,结果表明,法人股对公司业绩有积极影响,国有股对公司业绩的影响视具体情况而定.     

基于主体不平等的跨国界河流水资源分配的破产博弈研究

基于破产理论和讨价还价博弈,构建水资源分配的破产博弈模型。借鉴国际水法,构建主体在水资源分配谈判中的议价能力评价指标体系,将议价能力运用到破产博弈模型中,突出主体在水资源分配中的不平等性,减少水资源分配量与贡献、需求量和对水资源依赖程度的非对称性;结合主体的谈判破裂点,根据主体满意度函数的联动函数寻找水资源分配的最优解,使分配能同时满足个体理性和集体理性,并对澜沧江-湄公河流域进行实例研究。     

卧式吸尘器包装结构有限元研究

为了验证卧式尘袋吸尘器包装结构的安全性能,根据该吸尘器生产、物流过程中所处物流环境,采用Creo软件建模,通过施加相应约束条件, 分析卧式吸尘器包装件在物流环境中抗压、随机振动、跌落等情况,采用ANSYS Workbench软件分析包装件在相应载荷作用下的应力、变形以及物理试验下包装 、产品受损情况。结果表明卧式吸尘器包装件在最大堆码情况下,变形量未超过标准规定10 mm;经过模态分析,得到6阶模态参数表明不会发生共振现象;包装 件跌落试验结果表明应力应变较小。该吸尘器包装结构设计满足抗压、随机振动、以及跌落测试等要求,方案可行。     

改革开放40年我国高中阶段教育政策的价值变迁

高中阶段教育是世界各国制定教育规划时共同的关注焦点,也是我国义务教育向高等教育过渡的关键节点。改革开放以来,我国高中阶段教育政策从注重单方面质、量的平行发展到兼顾质与量的统筹发展,再到回归个体本身的个性发展,从关注学生的外部属性再深化到内部属性,价值取向处在逐步演进中,由最初的社会本位取向转变为大众主义取向,紧接着体现出以人为本取向,深刻反映了时代变化与发展的诉求。     

Bayesian adjustment for unidirectional misclassification in ordinal covariates

In this paper, we study the identification of Bayesian regression models, when an ordinal covariate is subject to unidirectional misclassification. Xia and Gustafson [Bayesian regression models adjusting for unidirectional covariate misclassification. Can J Stat. 2016;44(2):198–218] obtained model identifiability for non-binary regression models, when there is a binary covariate subject to unidirectional misclassification. In the current paper, we establish the moment identifiability of regression models for misclassified ordinal covariates with more than two categories, based on forms of observable moments. Computational studies are conducted that confirm the theoretical results. We apply the method to two datasets, one from the Medical Expenditure Panel Survey (MEPS), and the other from Translational Research Investigating Underlying Disparities in Acute Myocardial infarction Patients Health Status (TRIUMPH).