Service-Oriented Computing for intelligent train maintenance

The purpose of this work is to apply the servicization of enterprise information systems in maintenance, particularly in the management of the maintenance process of the component parts of trains. Service Oriented Architecture (SOA) is an architectural approach that permits servicization since it provides a flexible set of design principles used during the modeling practices (abstraction and realization). With a view to supporting the model-driven engineering of software systems, Mode Driven Architecture (MDA) is a design approach delivering a set of guidelines for the configuring of specifications in systems development. Therefore, the combination of these two approaches can be fruitful to address the challenging issues the enterprise information system is facing today. Our study is based on a methodological approach using the MDA models for the automatic generation of web service. The case study concerns a Railways Maintenance Workshop (RMW) at Sidi Bel Abbes (Algeria). Finally, the information system for the management of maintenance of the component parts of passengers and baggage railcars, using the generated solution, is realized and deployed. This software helps to have better management of the RMW by the effective planning of interventions, improve performance by increasing reliability, traceability, and availability of the equipment (parts).     

FDI对国内企业技术创新影响的理论与实证研究

通过建立一个简单的模型,本文首先从理论上分析了外商直接投资(FDI)对一个发展中国家自主研发投入的补充和替代作用,并得出了一些理论推断。以世界银行对中国公司的调查数据为基础,本文对这些理论推断进行了实证检验。本文的实证研究一致地得出了两个主要结论:第一,一个公司在研发方面的投入随其引进的外商投资数量的增多而减少;第二,行业层面的FDI对该行业中外商投资较多的企业的研发投入起更大的积极作用。综合这两方面的结果,本文的估测结果显示FDI对中国国内研发投入的净作用是负的。这些实证发现与本文的理论推断基本相符。