Web服务器上比例延迟保证的自适应控制方法

针对Web服务器一般采用离线辨识，使其反馈方法在Web QoS控制上应用的实时性往往不佳，提出了一种Web服务器自适应参考模型。该模型通过在线辨识，根据对象模型的变化及时更新模型参数和控制器参数，以尽快减小系统误差。最后，通过MATLAB仿真和实际网络测试表明，该控制器不仅在恶劣的网络环境下可维持较好的比例延迟保证，且相比于传统的控制方法具有一定的优越性。

Adaptive relative delay guarantee scheme for Web server

The application of feedback control to Web QoS has an imperfect real-time because of the offline identification.This paper proposed an adaptive controller which updated the model and controller parameters based on the changes of object model in order to reduce system error through an online identification.The MATLAB simulations and network tests show that the adaptive controller could maintain the relative delay guarantee well and has some advantages compared to the traditional methods.