FDI 对我国就业影响的动态效应与区域差异u1——基于动态面板数据模型的广义矩(GMM)分析方法

本文选取1996—2011年我国的省际面板数据,利用动态面板数据模型广义矩(GMM)分析方法,对 FDI 对我国就业影响的动态效应与区域差异进行了实证分析.研究结果发现,FDI 对我国就业影响的区域差异显著,整体上具有显著的挤出效应;仅滞后1期 FDI 对中部地区当年就业的创造效应显著,而其他时域的 FDI 对当年就业的影响均是负向的.因此,引进 FDI 无法吸纳更多的劳动力,依靠 FDI 很难缓解国内的就业压力.     

HIV and PTSD: A Confirmatory Factor Analysis of the PCL Screening Instrument

ABSTRACT

The findings are reported from a confirmatory factor analysis (CFA) of the posttraumatic screening checklist (PCL) created by Weathers et al. (1993) Weathers, F. W., Litz, B. T., Herman, D. S., Huska, J. A. and Keane, T. M. 1993. The PTSD Checklist (PCL): Reliability, validity, and diagnostic utility, Presented at Annual Meeting of the International Society for Traumatic Stress Studies, San Antonio, TX. [Google Scholar]. One hundred and eighty-six individuals receiving either preventive HIV information or ongoing HIV counseling from community-based AIDS organizations in the New York City area completed the PCL checklist. To identify a model relevant to screening posttraumatic stress disorder (PTSD) within the HIV/AIDS community, six CFAs were conducted. Results indicated that the PTSD scale should include attention to four general areas: a) reexperiencing the traumatic event; b) avoidance of anything associated with the traumatic event; c) a sense of numbing; and d) a hyperarousal state. The CFA produced a more concise model of 12 items, relevant to the HIV community. Future research suggests that the relationships between different components of trauma exposure and different manifestations of PTSD should be examined further.     

Protecting the Public's Health in An Era of Bioterrorism: The Model State Emergency Health Powers Act

During the fall of 2001, public health law scholars at the Center for Law and the Public's Health at Georgetown and Johns Hopkins Universities were asked by the Centers for Disease Control and Prevention (CDC) and a series of national partners to develop the Model State Emergency Health Powers Act (MSEHPA). The MSEHPA provides a series of modern powers for states to consider in responding to catastrophic public health emergencies, including bioterrorism events. Since December 2001, provisions based on the MSEHPA have been introduced in nearly 40 states and passed in 20. Underlying the development of the act is a long-standing debate between legal and ethical scholars and law- and policymakers as to the appropriate ways to balance individual and communal rights. The drafting challenge was to create a comprehensive model law that provides adequate powers to protect the public's health while also respecting individual and group rights. The MSEHPA empowers public health agents with broad authority and simultaneously limits the exercise of power in time, duration, and scope to accomplish communal goals of abating serious public health threats. Coercive public health powers, particularly isolation and quarantine, are exercised on a temporary basis, only so long as are reasonably necessary and only among persons who justifiably may pose a risk to others because of their contagious conditions. Individual rights to contest the coercive use of public health powers, even during an emergency, are secured.     

在职人员报考工程硕士研究生影响因素的实证研究

文章从工程硕士报考主体的视角对重庆地区5所高校的工程硕士考生进行了问卷调查,并运用因素分析的方法对影响在职人员报考工程硕士研究生的各因素进行了实证研究.提出了社会期望、工作需要、求知欲、学习兴趣、人际关系、调剂生活构成影响在职人员报考工程硕士研究生的6个主要因子.通过相关性分析,得知在职人员报考工程硕士研究生的影响因素与考生个人属性具有显著的相关性.     

论和谐社会动态稳定

分析了政治中不稳定因素对于维护政局稳定,构建和谐社会有着重要意义,指出要保持和谐的社会政治环境,需要法理性的合法性权威认同,满足社会一定的企望要求,以保证社会公平与正义,政治参与的有序与法制化,政治体制与机构的综合改革。     

基于连续时间动态博弈的供应链声誉及其微分对策研究

着眼于企业及其供应链的可持续发展,纳入时间因素分析供应链协调问题.基于供应链视角考虑顾客价值开拓,并将其本质抽象为“供应链声誉”的构建过程.针对这一供应链动态协调问题,基于供应链成员企业之间的长期合作关系,在连续时间背景下采用变分法建立了供应链各方关于供应链声誉的微分对策模型,通过求解该模型发现在拟约束方程组有解时Nash均衡存在,并求出了相应的最优微分对策.这些理论研究结论阐明了长期的、稳定的合作关系对于实现供应链协调的意义,对于实践中供应链动态协调的实现具有一定的启发与参考价值.论文最后对相关结论进行了数值分析.     

基于评价者过滤的个性化信任模型

信任问题是困扰C2C电子商务发展的重要瓶颈。在传统模型基础上,本文进一步引入5梯度的连续性评分标度、交易次数、多维评分、惩罚因子四项因素,研究两种商品交易历史对卖家信任的影响。为满足个性化选择,创建了评价者过滤机制,在此基础上构建可满足用户需要、防范信用欺诈的个性化信任模型,通过仿真实验验证模型的有效性。     

一类新型批处理机调度问题的理论分析

钢卷在冷轧生产中,为了改进其性能,需要在罩式炉进行退火,退火过程由加热、保温和降温三段组成,而这三段处理时间由于工艺上的要求不能归结为一个时间,这与传统批处理机调度有明显的差别.对新型批处理机的总加权完成时间最小化问题建立了非线性整数规划模型,开发了基于动态规划的启发式算法.通过理论分析,获得该算法的误差性能比为3.对于三段中的某一段板卷的处理时间相同的情况,证明了启发式算法的误差性能比是2,而且证明是紧界.对于三段中的某二段板卷的处理时间相同的情况,证明了启发式算法是最优算法.对启发式算法扩展到带有任意段的加工时间的一般情况进行了性能分析.     

管理创新效力机制研究:基于动态能力观视角的研究框架

管理创新逐渐成为企业竞争优势最重要和持续的来源,但其复杂性及其对组织绩效影响的滞后性使得学者和实业家对管理创新效力提升问题倍感困惑。为此,以普遍存在的引进型管理创新为研究对象,尝试从企业动态能力观视角提出提升管理创新效力的思路或研究框架,并进一步从管理者个人和组织双层面阐释动态能力的提升路径,旨在为管理创新研究提供一个新的研究视角。     

Dynamic Competition With Random Demand and Costless Search: A Theory of Price Posting

This paper studies a dynamic model of perfectly competitive price posting under demand uncertainty. Firms must produce output in advance. After observing aggregate sales in prior periods, firms post prices for their unsold output. In each period, the demand of a new batch of consumers is randomly activated. Existing customers who have not yet bought and then new customers arrive at the market in random order, observe the posted prices, and either purchase at the lowest available price or delay their purchase decision. We construct a sequential equilibrium in which the output produced and its allocation across consumers is efficient. Thus consumers endogenously sort themselves efficiently, with the highest valuations purchasing first. Transaction prices in each period rise continuously, as firms become more optimistic about demand, followed by a market correction. By the last period, prices are market clearing.