Resumo

GUEVARA LOPEZ, Pedro; VALDEZ MARTINEZ, Jorge Salvador; GONZALEZ, Jesús Audelo  e  DELGADO REYES, Gustavo. Numerical Approaching of Si Epidemic Model for Spreading of Computer Worms, Simulation and Error Analysis. Tecnura [online]. 2014, vol.18, n.42, pp.12-23. ISSN 0123-921X.

In the biological environment, there has been created epidemiological models that attempt to explain the spread dynamics of an epidemic in a population to predict the behavior of possible epidemics that can affect humanity. Based on that, this paper focused on the study of epidemics worms because they can spread by themselves from one infected host to the entire network of susceptible hosts. In this paper we analyzed the susceptible-infected {SI) model which assumes that in a community with n individuals, the number of individuals in the susceptible state S{t) are in direct contact with the number of individuals that are in infected state I(t). These last individuals can spread the infection or switch to an infectious state with the factor ß as a speed of infection. This model is based on differential equations so it cannot be implemented directly on a computer. Due to the complexity of this model, it is proposed an approximate model based on finite different equations to achieve a simulation of the epidemic using a set theory and cardinality obtaining an iterative numerical method which consists on basics arithmetic operations. Additionally, having in mind this is an approximate model, it will be presented an error due to truncation or rounding. At the end of this paper it will be presented a case of study developed in Simulink of Matlab software, and the results of the model based on difference equations is compared with the finite-difference approximate model including the analysis of approximation errors.

Palavras-chave : algorithm; bio-inspired; computer worm; epidemic; simulation.

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