Niu Yugang

Congestion control for wireless sensor networks: A survey

Due to the characteristics of source limited, multi-to-one paths and burst data flow, congestion inevitable happens in wireless sensor networks (WSNs). The control mechanism of congestion for WSNs is of high significant and plays a key role in achieving high QoS of the network. In this paper, many existing congestion control mechanisms have been summarized and compared, some interesting topics have been provided.

Stabilization and H ∞ control of switched stochastic systems

This paper is concerned with the stabilization and Hinfin control problems for continuous-time switched stochastic systems. By applying the average dwell time method and the piecewise Lyapunov function technique, sufficient conditions are first proposed, which guarantee the unforced switched stochastic system to be mean-square exponentially stable with a prescribed Hinfin performance. Then, the stabilization and Hinfin control problems are solved.

Adaptive congestion control algorithm based on predictive control

Internet system is essentially a delay system. Large delay brings bad influence to the performance of internet. A new Active Queue Management Algorithm - Smith-NPID is designed by combining Smith predictor with single Neuron PID. This algorithm overcomes the negative impact on the queue stability caused by large delay, and can enhance the learning and adaptive ability of system.

An active queue management algorithm based on Internal Model PID control with integral separate

In order to overcome the disadvantages of the traditional PI controller, e.g., the long time adjustment and weak robust performance. This paper proposed an internal model PID control with integral separate. The key feature of the present algorithm lies in that it is easy to adjust its parameters and with the use of integral separate method, it not only maintain the integral effect but also decrease the overall capacity. Simulation results show that IMC PD-PID has stronger robust performance and quicker queue adjusting velocity.

Sliding mode control for neutral delay systems with unmatched uncertainties

This paper deals with the problem of sliding mode control for a class of uncertain neutral delay systems. In the systems under consideration, there exist mismatched uncertainties in both state matrices and input matrix. The sliding surface is chosen as the function of current states and delayed states. A sufficient condition is given to guarantee the asymptotic stability of closed-loop systems. Moreover, the proposed sliding mode control law can guarantee that the state trajectories is driven onto the specified sliding surface in finite time and remain there for subsequent time. Finally, an illustrative example is provided.