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In order to improve the quality of service (QOS) in network transmission, a fuzzy logic active algorithm based on innovative Smith controller is proposed in this paper. This algorithm adopts an improved fuzzy self-tuning principle to make the length of routing queue near to the reference value at a relatively stable level by adjusting the packet loss probability on TCP protocol and changing the active...
LEACH is a classical communication routing protocol designed for WSN to reduce the energy consumption of each sensor node. Based on the original LEACH protocol, we propose a new method of choosing cluster-heads which decreases unnecessary consumption of energy spent on computing of each node during each round. Because the traditional choosing formula neglecting to the change of nodes' energy will...
For financial investment, the problem that we often encounter is how to extract information hidden in the volatile and noise data and forecast it into future. This study proposes a novel three-stage neural-network-based nonlinear weighted ensemble model. In proposed model, three different types neural-network base models, i.e., Elman network, generalized regression neural network (GRNN) and wavelet...
A new approach for the stability analysis of FAST TCP system is used for the investigation of one special kind of dynamical systems. This approach is based on results from the stability theory, optimal control theory, and variational methods. The optimal control approach allows us to obtain sufficient algebraic stability conditions for FAST TCP system. The way to obtain necessary and sufficient conditions...
An improved Vegas scheme is proposed with a measure of congestion control as average round trip time rather than round trip time. It enhanced the prevention of congestion control. Simulation results demonstrate in some scenario that the instantaneous queue length improved the stability and decreased response time.
A congestion control scheme based on combination of Smith principle and fuzzy control is proposed. The fuzzy controller is based on differences of queues length and drop probability of packets. The Smith controller provides effective offset of TCP networks to reduce influence of time delay to system by using system feedback control. By Lyapunov method analysis, the stability of the congestion control...
The parameter tuning of FAST TCP based on Lyapunov function is developed. The satisfied condition is derived. Performances including congestion window size, buffer queue length are enhanced through simulations which compare with the original FAST TCP.
An improved window control scheme is proposed, which focus on stability and efficiency of dynamic high-speed networks in present of feedback. Foreseen problems introduced by such instability are inefficiency due to dramatic oscillation. We analyze the continue-time model of improved fast TCP and the bound of gain parameter is derived which satisfy the stability of system. The results demonstrate that...
The global asymptotically stability of FAST TCP by nonlinear delay differential equation with heterogeneous delays is developed. Since the traditional self-stabilization approaches lack the flexibility to deal with the variable adaptation of the complex network within FAST TCP, the study emphasizes an alternate self-stability analysis approach, namely Lyapunovpsilas second method. The time-delay that...
From the viewpoint of control theory, TCP congestion control system can be regarded as a feedback regulating system. In this paper, a novel active queue management (AQM) scheme, called WTCP, is proposed for TCP congestion control in high speed wired/wireless Internet. The design principles of WTCP are presented in details. Simulation results demonstrate that the WTCP AQM outperforms FAST TCP in items...
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