Transformations of the state variable and learning dynamics

This article examines dynamics in a model where agents forecast a one dimensional state variable through ordinary least squares regressions on the lagged values of the state variable. We study the stability properties of alternative transformations of the state variable, such as taking logarithms, which the agent can endogenously set forth. Surprisingly, for the considered class of economies, we found that the transformations that an econometrician would attempt are destabilizing, whereas alternative transformations, which an econometrician would never consider, such as convex transformations, are stabilizing. Therefore, we ironically find that in our set‐up, an active agent who is concerned about learning the economy’s dynamics and who in an attempt to improve forecasting transforms the state variable using standard transformations, is more likely to deviate from the steady state than a passive agent.     

高等教育宏观调控背景下地方普通师范院校中等职业教育与成人高等教育一体化培养模式探析

地方普通师范院校在转型发展过程中,需要探索非教师教育发展道路。成人高等教育与高等职业教育应用型人才的培养目标为"中高职一体化"人才培养提供了借鉴;成人高等教育多年的办学实践为"中高职一体化"人才培养奠定了基础;高等职业教育的培养模式为"中高职一体化"人才培养指明了方向。"中高职一体化"人才培养模式以技术应用能力培养为主线,注重理论应用以及职业素质和职业道德培养。通过实施资源共享、分段教育、专业衔接、创建"双师型"队伍、调整课程、成职渗透和提高素质的培养模式,实现"中高职一体化"办学的人才培养目标。     

Consumer Preferences for Fresh Tomatoes in Benin using a Conjoint Analysis

Constraints related to the technical and socioeconomic aspects of adopting tomato varieties are well documented. However, preferences relating to the demand for this fruit are rarely studied. In fact, demand for the different varieties of tomatoes might be related to consumers’ preferences for the extrinsic (color, size) and intrinsic (taste, nutritive value, water content) characteristics specific to each variety. It is therefore indispensable to determine the characteristics of tomatoes preferred by consumers. We examine consumers’ preferences for tomato attributes among a sample of 600 consumers in four representative markets in the main cities in southern Benin. The study also identifies potential segments of consumers and the market shares of each profile for each segment. The study identifies four potential tomato market segments, two of which have a strong preference for local tomatoes, namely, those that can be conserved for long periods and those with a firm consistency.     

Revisiting the role of the environment in the capabilities–financial performance relationship: A meta‐analysis

Within the capabilities‐based view of the firm, there is debate about the relative importance of ordinary and dynamic capabilities for firm performance and about the extent to which their performance effects are contingent on environmental conditions. We meta‐analyze 115 studies to investigate the relationship between both ordinary and dynamic capabilities and the financial performance of firms in relatively stable versus changing environments. The results suggest that the performance effects of both types of capabilities are positive and similar in magnitude. Environmental dynamism reinforces the effects of both ordinary and dynamic capabilities. Furthermore, the two types of capabilities are closely associated. Our findings provide support for a moderate capabilities‐based view of the firm, rather than one that considers dynamic capabilities as superior to ordinary ones. Copyright © 2015 John Wiley & Sons, Ltd.     

从教研教改中浅析工程型人才的培养

本课题通过对微型数控教学机床的研制,依据我校"技术立校、应用为本"办学方针,在教研教改中探索工程型人才的培养方案,进一步推进我校本科教育向工程实用型人才的培养方向发展。     

Ruin probabilities in models with a Markov chain dependence structure

In this paper we derive explicit expressions for the probability of ruin in a renewal risk model with dependence among the increments (Z _k ) _k>0. We study the case where the dependence structure among (Z _k ) _k>0 is driven by a Markov chain with a transition kernel that can be described via ordinary differential equations with constant coefficients.     

我国强制结售汇制度的发展历程与改革

我国的强制结售汇制度是在改革开放初期特殊的环境下实施的外汇管理政策;目前,强制结售汇产生了风险倒置效应,增大了中央银行进行货币政策宏观调控的难度,扭曲了外汇市场上的外汇的供求关系,有必要、也有条件取消强制结售汇政策,实施意愿结售汇政策。此项改革中,还必须进行一些相应的配套政策的改革,以实现平稳过渡。     

普通高校大学生信仰危机的社会因素浅析——以西安文理学院为例

随着我国教育体制改革的推进,社会对普通高校大学生的思想政治教育越来越重视,信仰教育作为思想政治教育的核心,其地位也日益凸显。本论文旨在对西安文理学院学生信仰状况调查的基础上,考察普通高校大学生在信仰方面存在的问题,从而分析大学生信仰危机形成的社会原因,最后提出从四个方面,来加强普通高校大学生的信仰教育。     

农业生产经营主体投资行为的实证分析——以安徽省5个区县为例

文章以安徽省5个区县200余户不同农业生产经营主体的调研数据为基础,运用Probit模型对新型农业生产经营主体和普通农户的固定与流动资本投资行为进行分析。研究结果表明,新型农业生产经营主体投资大于普通农户;经营主体向非农业的转型程度对于两类主体的农业生产投资均有负面影响;土地面积增大和土地租期延长促进新型农业生产经营主体提高农业投资水平;经营者个人学历对固定资本投资影响亦显著。文章认为需要提升农业生产者收入,改善土地流转制度以及改革农业贷款制度等措施,来调动农业生产经营主体投资积极性。     

基于虚拟现实的数控车床结构拆装与仿真系统

基于虚拟现实的数控机床仿真研究一直是虚拟机床领域的热点,本文提出将Virtools三维交互技术运用于数控车床的虚拟拆装与仿真,给出了系统的技术层次结构和开发环境,从机床三维建模和模型数据管理、人机交互、机床部件的运动控制、碰撞检测等方面对系统进行详细研究。最后开发出数控车床内部结构的虚拟拆装仿真系统。