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Software-defined networking has emerged as a promising solution for supporting dynamic network functions and intelligent applications through decoupling control plane from forwarding plane. OpenFlow is the first standardized open management interface of SDN architecture. But it is unrealistic to simply swaping out conventional networks for new infrastructure. How to integrate OpenFlow with existing...
Shielding effectiveness test is a typical application of nanosecond high voltage pulse. A Compact High Power Pulsed Simulator for the shielding effectiveness is developed. To obtain fast rise time of pulse voltage, a switch has to have low inductance. A liquid gap switch has this property. This switch operates with fixed anode, cathode and a removable trigger electrode. The switch gap is filled with...
Looking for usable gateway is a process, which brings the biggest overhead, in MANET accessing Internet. For controlling the routing overhead effectively, a gateway discovery method for MANET accessing Internet based on overhead control, which is according to the similar between ant searching path and mobile node searching gateway, is proposed in this paper. By simulating the pheromone's update process...
As an important dynamic compensation device, the D-STATCOM is widely used in the power system, but its output current contains a lot of high-frequency harmonic composition. The LCL filter, a typical output filter, has good filter characteristics, but the compensation characteristic of D-STATCOM has strong sensitivity to the filter parameters. The paper firstly analysis the influence caused by the...
A Metropolis criterion based fuzzy Markov game flow controller (MFMC) is proposed to cope with congestion problems in high-speed networks. Because of uncertainties and highly time-varying time delays, for such networks the complete and accurate information is not easy to obtain in real time The Q-learning, which is independent of mathematic model and prior knowledge and yet enables achieving good...
There are two causes of network congestion: one is the lack of network resources, and the other is the irrational allocation of network resources. While traditional congestion control methods such as rate control, window mechanism, queue control, etc. can be applied to solve the congestion problem, but for the later congestion case, the fundamental solution is to make more effectively use of the network...
To guarantee the quality of service (QoS) when failure takes place, the fault-tolerant MultiProtocol Label Switching (MPLS) network should find out failures as soon as possible. This paper proposes a MPLS failure detection mechanism, named bimodal detection (BD). Based on the adaptive model (AM), it adaptively adjusts the detection period along with delay variation and occurrence of detection timeout...
This paper presents a Sin microstepping method which can achieve constant torque, accurate position control and eliminate low frequency oscillation. The driver adopts FPGA as core, achieving 256 subdividing and PID control algorithm. This paper uses EDA Simulator Link as a co-simulation tool, which provides an interface between Modelsim and Simulink accelerating the function verification. The co-simulation...
A fast rerouting scheme is proposed to guarantee the QoS performance of rerouted path when handling link and node failures. The new scheme is based on deflection routing mechanism and improves on two aspects: first, it can promptly handle single node failure as well as single link failure, second, QoS metric is taken into accounted when calculating recovery routes. Simulation results show that the...
Many stream-based applications have real-time performance requirements for continuous queries over time varying data streams. In order to address this challenge, a real-time continuous query model is presented to process multiple queries with timing constraints. In this model, the execution of one tuple passing through an operator path is modeled as a real-time task instance. A fine-grained scheduling...
This paper proposes a new approach to analyze crosstalk of coupled interconnects in the presence of process variations. The suggested method translates correlated process variations into orthogonal random variables by principle component analysis (PCA). combined with polynomial chaos expression (PCE), the technique utilizes Stochastic Collocation Method (SCM) to analyze the system response of coupled...
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