Interregional migration and labor market imbalances

This paper investigates the effects of internal migration in developed countries on widening wage inequality and high unemployment, and it addresses the geographical dimension of both problems. A two-region dynamic model is developed, which accounts for the skill composition of recent internal migration flows; it also innovates on the existing literature on migration by introducing capital-skill complementarity in the production function. The main conclusion is that migration can actually aggravate labor market imbalances. In a competitive set-up, migration temporarily amplifies the geographical dispersion of unskilled workers wages and raises the average wage premium of the economy. When wage rigidities are introduced, labor mobility increases regional dispersion of unskilled workers employment. In the short-run it may even reduce the total employment of the economy.A previous version of this paper circulated with the title Migration Flows and Interregional Labor Market Disequilibrium. I would like to thank Samuel Bentolila, Federico Biagi, Fabio Canova, Alessandra Casarico, Rosa Maria Fernandez, Juan Francisco Jimeno, Adriana Kugler, Javier Ortega, Ferdinando Regalia, Gilles Saint-Paul, Etsuro Shioji, Marco Vannini, two anonymous referees, participants at UPF Macro Workshop, 1997 ASSET meeting, Marseille, 1998 ESPE Annual Conference, Amsterdam, and 1999 Winter Meeting of the European Econometric Society, Rotterdam, for helpful comments and suggestions; Alix Beith for her friendly help. The usual disclaimer applies. Responsible editor: Allessandro Cigno.     

业务流程管理成熟度模型设计与分析

成熟度模型可以帮助企业分析其业务流程管理现状及存在的问题,以便不断提高企业业务流程管理水平。首先描述业务流程管理和成熟度模型的涵义,分析了业务流程管理成熟度模型的研究现状,然后对该模型的外部结构进行了设计,包括初始级、可复用级、已定义级、可管理级和优化级五个等级;并且从评价指标体系、指标权重、评价方法、优化准则四个方面对模型的内部结构进行了详细的设计。利用该模型对某公司现有的业务流程管理水平进行了分析与评价,并提出具有针对性的业务流程优化建议。     

张謇"父教育而母实业"之内蕴及其当代意义

“父教育而母实业”之思想,既是张謇对自己多年教育实业实践的提炼总结,亦是他后来从事教育实业的指南。从实际意义上说,“父教育而母实业”是张謇建设南通、成就事业、实现理想的思想基点。晚清的社会现实以及张謇对现实的感知是“父教育而母实业”提出的逻辑起点,该思想具有丰富的内在意蕴,在今天仍具有积极意义。     

对水利勘察设计企业应用风险导向审计的思考

我国新审计准则体系引入了风险导向审计的理念与模式,内部审计作为风险管理的重要环节之一,在企业管理中发挥着不可替代的作用。应结合水利勘察设计企业实际,以行业内部审计实务为出发点,明确应用风险导向审计的现实意义、行业优势与面临的问题,以推广现代风险导向审计。     

Controlling epileptic seizures in a neural mass model

In an effort to understand basic functional mechanisms that can produce epileptic seizures, we introduce some key features in a model of coupled neural populations that enable the generation of seizure-like events and similar dynamics with the ones observed during the route of the epileptic brain towards real seizures. In this model, modified from David and Friston’s neural mass model, an internal feedback mechanism is incorporated to maintain synchronous behavior within normal levels despite elevated coupling. Normal internal feedback quickly regulates an abnormally high coupling between the neural populations, whereas pathological internal feedback can lead to hypersynchronization and the appearance of seizure-like high amplitude oscillations. Feedback decoupling is introduced as a robust seizure control strategy. An external feedback decoupling controller is introduced to maintain normal synchronous behavior. The results from the analysis in this model have an interesting physical interpretation and specific implications for the treatment of epileptic seizures. The proposed model and control scheme are consistent with a variety of recent observations in the human and animal epileptic brain, and with theories from nonlinear systems, adaptive systems, optimization, and neurophysiology.     

我国股份公司监督机制存在的问题与法律对策

股份公司的监督机制是一个内外结合的监督体系.内部监督水平低、效果差,外部监督机制缺失是股份公司治理的突出问题.扩大监事会权力、完善独立董事制度和股东诉讼机制,建立外部监督机制是完善股份公司监督机制的重要途径.     

连续梁板结构的递推计算与应用

推出了求解无结点侧移连续梁的结点转角位移的递推公式,进而求得梁板的内力.本方法概念清楚,不解方程,手算方便,并且又宜编程、机算.