Analysis of a SEIR-KS Mathematical Model For Computer Virus Propagation in a Periodic Environment
Abstract
:1. Introduction
1.1. Scope
1.2. The Generalized SEIR-KS Mathematical Model
- (A1)
- The network at time t is formed by a total of nodes. Then, we have the following relation at each time t.
- (A2)
- There is a behavior similar to vital dynamics of biological virus. More specifically, related with births and deaths, there is two characteristics in the process: (i) the new nodes are connected to the network at constant rate b and a fraction p are of susceptible type and the remaining fraction are of exposed type; and (ii) each node, by system crash or network interruption, are disconnected from the network at constant rate .
- (A3)
- The dynamics of exposed nodes are characterized by three facts: (i) the susceptible nodes are transformed in exposed nodes with probability per unit time with a constant; (ii) the exposed nodes are converted into infected ones at constant rate ; and (iii) the exposed nodes are converted into kill signals ones at constant rate .
- (A4)
- The infected nodes are converted into kill signals nodes or recovered ones at constant rates and , respectively.
- (A5)
- The kill signal nodes satisfy two additional premises: (i) the susceptible nodes receive the kill signal and converted into recovered ones with probability ; and (ii) the infected nodes receives and relays the kill signal nodes with probability . Here and are constants.
1.3. Reformulation of System in Equation (2) as Operator Equation
1.4. Main Results
- (a)
- If and are such that , the following inequalitiesholds for all
- (b)
- If are such that , the following inequalitiesholds for all
1.5. Related Works
1.6. Outline of the Paper
2. Preliminaries
2.1. The Mawhin’s Continuation Theorem
- (i)
- There are two continuous projectors and such that and .
- (ii)
- is invertible and its inverse is denoted by .
- (iii)
- There is an isomorphism .
- (C1)
- for each .
- (C2)
- for each
- (C3)
- .
2.2. L Is a Fredholm Operator of Index Zero
2.3. Construction of the Projectors and the Operator
- (a)
- . We prove that as follows: from the isomorphism given on Lemma 1, we observe that is equivalent to the fact that is constant for all which at the same time implies that , since for constant we have that Conversely, the proof of the inclusion is deduced by the following facts: for there is such that and from Equation (21) we obtain that which implies by differentiation the fact that or
- (b)
- . From the definition of Q given in Equation (21) we have that is equivalent to and from the characterization of given on Lemma 1 is at the same time equivalent to
- (c)
- . Let , then there is such that , which implies that
- (d)
- Operators and The notation is is introduced for the restriction of L to i.e., is the operator defined from to and on . The symbol is used to denote the inverse of , and is precisely defined as the operator such thatWe notice that, we can prove that the operator is the inverse of the operator by application of the following identity
2.4. N Defined on Equation (6) Is a Continuous Operator
2.5. N Defined on Equation (6) Is L-Compact on any Ball of X Centered at .
2.6. A Useful Auxiliary Result
3. Proof of Theorem 2
3.1. Four Useful Lemmata
- (i)
- we prove that for
- (ii)
- we prove Equation (45) for
- (iii)
- we prove Equation (47) for
- (iv)
- we prove Equation (46) for
- (v)
- we prove Equation (47) for
3.2. Proof of (a)
3.3. Proof of (b)
4. Proof of Theorem 3
4.1. A Previous Lemma
- (C1)
- Let us assume that there are and such that Then, by application of Theorem 2-(a) we deduce that which is a contradiction to the assumption that
- (C2)
- Let us assume that there is such that Then, by application of Theorem 2-(b) we deduce that which is a contradiction to the assumption that
- (C3)
- Let us define the mapping by the following relationWe prove that when and . From Lemma 1 we recall that is a constant. Let us consider that the conclusion is false, then the constant vector with satisfies , that is,Then, by following similar reasoning steps to the proof of Theorem 2-(a) we get that , which contradicts to the assumption that .Let us consider such that , then by applying the Homotopy Invariance Theorem of Topology Degree, using the fact that the systemHence, we get that and prove that (C3) is valid.
4.2. Proof of Theorem 3
5. Proof of Theorem 4
6. An Example
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
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Coronel, A.; Huancas, F.; Hess, I.; Lozada, E.; Novoa-Muñoz, F. Analysis of a SEIR-KS Mathematical Model For Computer Virus Propagation in a Periodic Environment. Mathematics 2020, 8, 761. https://doi.org/10.3390/math8050761
Coronel A, Huancas F, Hess I, Lozada E, Novoa-Muñoz F. Analysis of a SEIR-KS Mathematical Model For Computer Virus Propagation in a Periodic Environment. Mathematics. 2020; 8(5):761. https://doi.org/10.3390/math8050761
Chicago/Turabian StyleCoronel, Aníbal, Fernando Huancas, Ian Hess, Esperanza Lozada, and Francisco Novoa-Muñoz. 2020. "Analysis of a SEIR-KS Mathematical Model For Computer Virus Propagation in a Periodic Environment" Mathematics 8, no. 5: 761. https://doi.org/10.3390/math8050761
APA StyleCoronel, A., Huancas, F., Hess, I., Lozada, E., & Novoa-Muñoz, F. (2020). Analysis of a SEIR-KS Mathematical Model For Computer Virus Propagation in a Periodic Environment. Mathematics, 8(5), 761. https://doi.org/10.3390/math8050761