【摘要】 动态扩展技术的研究能够解决操作系统设计中许多长期存在并难以解决的问题。这些问题包括：如何在提高应用程序的性能同时保证系统的安全性；如何提高操作系统使用的灵活性；如何包容和管理随着操作系统发展而不断增加的复杂性。文章对当前各种操作系统扩展类型进行详细分类，具体介绍了各种动态扩展技术，评估了不同的扩展技术对操作系统性能和安全性的影响，最后提出了需要研究的内容以及其中的关键问题。更多还原

【Abstract】 ： The research in dynamically extension technique can resolve many difficult problems，which have been for a long time in operating system design．The problems including How to improve the performance of application while ensuring the safety of the system，How to improve the flexibility of OS，How to contain and manage the ever－increasing complexity of OS implementations．The paper first introduces many dynamically extension technique and does classifying．Then it evaluates the influences which different extension technique does on the performance and security of OS．Finally the paper analyzes the research content and puts forward the research issues to be solved．更多还原