中国企业参与全球价值链的持续时间及其决定因素

研究目标：考察中国企业参与全球价值链的持续时间及其决定因素。研究方法：采用2000~2007年中国企业面板数据,通过生存分析模型进行研究。研究发现：中国企业进入和退出全球价值链（GVC）的企业数量大体呈上升趋势,企业总体嵌入GVC的持续时间较短,均值为1.827年,且随着持续时间增长企业生存的危险性逐渐降低。其中东部地区企业、加工贸易企业、民营企业和外资企业在GVC中的生存率更高,风险率更低,持续嵌入GVC的能力更强。出口发达国家的企业、加工贸易企业、民营企业、外资企业和具有较好研发能力、全要素生产率较高、规模较大、融资约束较小、年龄较小的企业退出GVC的概率更低,嵌入GVC的持续时间更长。研究创新：构建企业层面价值链嵌入程度指标,并运用生存分析创新性地考察中国企业在全球价值链中的进入退出行为。研究价值：对评析贸易开放的利得以及寻求“中国制造”在全球价值链中持续经营的模式具有重要的理论意义。     

AutoCAD教学方法研究

本文针对AutoCAD教学中存在的一些问题,提出了能够调动学生积极性的教学方法。鼓励学生在实际应用中学习。实践证明,新的教学方法能够提供教学效果。     

正交试验在企业生产实践中的应用

企业在进行开发性质量管理的科研、产品与工艺设计时,常常遇到多因素试验分析的问题,并且,因素之间的交互作用复杂,各因素的主次难以分清,常常需要多次重复试验,以求最优。同时,希望通过试验认识各因素间的主次关系、搭配综合作用关系等。在进行试验时,能否以尽可能少的试验次数来达到要求。正交试验法就是为了这个目的,解决合理的安排试验,对试验进行科学分析的问题。以企业中制定酚醛树脂砂配方试验、燃气阀分部件密封试验的两个实例,对每个正交试验方案的设计进行了详细的阐述。     

谢宁实验设计应用研究

从实验设计的发展历史开始简单介绍了3种不同的实验设计方法——经典实验设计、田口方法和谢宁方法,并以实例详细介绍了谢宁实验方法的具体应用。     

Assessing information provision and respondent involvement effects on preferences

We develop a test of the effect of information and respondent involvement on preferences for passive-use values using three treatments. Individuals from a rural community participated in one of three groups, each with a different level of involvement in the valuation assessment. The first group was highly involved, attending three meetings which allowed for information acquisition and preference construction. The second group was involved in a single meeting, and the third group was minimally involved through telephone contact and the completion of a mail administered survey. The hypothesis examined was that the degree of involvement in the exercise would affect the magnitude and consistency of preferences across the groups. The hypothesis that the preferences differ was not accepted. Furthermore, the hypothesis that variances in preferences would be higher in less involved groups was also rejected. While the analysis is based on relatively small samples the findings suggest caution in claiming that increasing degrees of respondent involvement improve economic measures of trade-offs.     

Identifying significant characteristics of organic milk consumers: a CART analysis of an artefactual field experiment

The organic dairy category is one of the fastest growing categories of organic foods in the US. Organic milk consumers generally cite perceived health benefits and lower risk of food contamination, as well as perceived superior quality and environmental sustainability of organic farming methods, as the major motivations for preference of organic over conventional milk. While the attributes of organic milk that are valued by consumers are fairly well-known, more ambiguity exists regarding the demographic characteristics of the typical organic milk consumer. This research makes use of experimental data from 148 adult participants and use a Classification and Regression Tree (CART) analysis, a nonparametric modelling approach, to identify how Willingness-to-Pay (WTP) for organic milk varies with the demographic profile of experiment participants. The study finds that perceived taste of organic milk, concern for the risk of consuming conventional milk, being a primary shopper, and the quantity of milk consumed are the major factors that separate experiment participants into groups with high and low WTP for organic milk.     

Cournot Competition and Hit-and-Run Entry and Exit in a Teaching Experiment

Instructors can use a computerized experiment to introduce students to imperfect competition in courses on introductory economics, industrial organization, game theory, and strategy and management. In addition to introducing students to strategic thinking in general, the experiment serves to demonstrate that profits of a firm fall as the number of competitors is increased in a market and that firms enter profitable markets. The authors have used the experiment in undergraduate classes on strategy and management as well as in master of business administration courses with great success.     

A Classroom Tariff-Setting Game

The author outlines a classroom tariff-setting game that allows students to explore the consequences of import tariffs imposed by large countries (countries able to influence world prices). Groups of students represent countries, which are organized into trading pairs. Each group's objective is to maximize welfare by choosing an appropriate ad valorem tariff that may be changed intermittently throughout the game. The game is built on a computable general-equilibrium model, which allows each nation's utility and terms of trade under alternative tariff regimes to be expressed quantitatively. The exercise encourages students to consider terms-of-trade improvements and efficiency losses resulting from large-country tariffs and provides a framework to discuss the Nash equilibrium of a tariff war. The game is a useful supplement to traditional teaching methods.     

电工学实验教学改革研究与实践

电工学课程是高校非电专业开设的一门实践性很强的技术基础课,而电工学实验教学是电工学课程教学中的重要环节。深化电工学实验教学改革,完善电工学实验教学体系,有利于培养学生创新意识和工程实践能力。     

Textbook Treatments of the Financial Market in the IS-LM Model

Intermediate macroeconomics textbooks introduce financial markets into the IS-LM analysis but typically as a beginning-of-period consideration. Here the financial market is introduced in an end-of-period model.