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Due to the vulnerability of computer system, Internet worm is still greatly threatenning network security. It is found that the spread of worm regularly change because of the different space distributions of hosts and this phenomenon is defined as diurnal pattern. Based on diurnal pattern, two worm propagation models, namely simple diurnal forced model and complicated diurnal forced one, are constructed...
In this paper, a worm propagation model with pulse quarantine strategy is proposed to control the spread of the worm. This model which combines both the pulse quarantine and the constant quarantine strategy not only describes the propagation of the worm well and but also makes the infections eradicated effectively. Here, we show that there exits a stable infection-free periodic solution of the system...
A chaotic worm propagation model is proposed to analyze early worm propagation process in this paper. Worm propagation is very complex, whose major transitions are between regular cycles and irregular, possibly chaotic epidemics. This paper deals with a discrete mathematical model of early worm propagation systems: Chaotic Susceptible-Infected (CSI) model. In the CSI model, three threshold values...
Reynolds number has a direct impact on the performance of a wind turbine aerofoil. In this paper, the airfoil NREL S809 was chosen for the research, using numerical simulation and experiment for the performance of the two-dimensional aerodynamic airfoil flow. While Reynolds number varies from 1.5times104 to 2times105, both the drag coefficient and the lift coefficient have great changes. However,...
Reynolds number has a great impact on the performance of the scale model which is smaller than the original wind turbine. In this paper, three-dimensional numerical simulation by using the software FLUENT was applied to obtain the aerodynamic performances of the scale model. A prediction of Reynolds number impact on the scale model was presented and the results agreed well with the conclusion of a...
Due to the features of interaction between malicious codes, the cooperation becomes more and more common. In this paper, cooperation between worm and virus is discussed in detail, and a cooperation model named CM model is proposed to describe the dynamical process of propagation. Results of simulation and mathematic analysis show that the propagation performance is significantly improved with the...
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