中文摘要：

网络诱导延时是引起网络化控制系统性能下降甚至不稳定的主要因素之一，如何减小延时或降低其不确定性以克服延时的不利影响，一直是网络化控制系统研究领域的一个关键问题．对此，从控制和通讯网络两方面出发，对目前关于延时问题的研究结果进行了详细的论述和总结；通过系统地分析和对比，指出现有理论成果中存在的问题和不足；最后，指出该领域今后的主要任务和发展方向，并给出了一些有益的建议．

英文摘要：

Network-induced delay is one of the most important sources resulting in degradation of control performance or even instability of networked control systems （NCS）. How to overcome such disadvantages owning to delay, by diminishing it or reducing its uncertainty, is one of the key problems in the area of NCS ever since. A detailed description and summarization of the existing research results concerning network-induced delays are made in two basic aspects： control and communication network. Some essential problems and shortage of these theoretical results are presented by systematically analysing and comparing. Finally, several important topics and potential directions for future research are outlined, together with beneficial advices.