Mahalank, Pushpalatha Ozon Yildirim, Seyma Ersoy Zihni, Fikriye Majhi, Bhairaba Kumar Cangul, Ismail Naci
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ITM Web of Conferences

In graph theory, lattices are used when some structural part of the graph repeats itself finitely or infinitely many times. They have applications in complex analysis and geometry in mathematics, and also natural applications in chemical graph theory. As a lattice can be taken as a graph, it is also possible to use them in the study of large networ...

Constantinescu, Dana
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ITM Web of Conferences

The classical bifurcations that occur in the SIR system were already studied in many papers. Our attention is focused on the singular bifurcations, when the system has in infinite number of periodic points at the bifurcation limit. The dynamics of the system is analyzed and the results are interpreted from a practical point of view.

Boureanu, M.-M. Constantinescu, D. Munteanu, F. Popescu, M. Popescu, P. Vladimirescu, C.
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ITM Web of Conferences

Vlad, Serban E.
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ITM Web of Conferences

A discrete time Boolean asynchronous system consists in a function Φ : {0, 1}n → {0, 1}n which iterates its coordinates Φ1, ..., Φn independently of each other. The durations of computation of Φ1, ..., Φn are supposed to be unknown. The analysis of such systems has as main challenge characterizing their dynamics in conditions of uncertainty. For th...

Diamandescu, Aurel
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ITM Web of Conferences

This paper deals with obtaining (necessary and) sufficient conditions for Ψ− uniform asymptotic stability of solutions of nonlinear Lyapunov matrix differential equations.

Nicolae, Ileana-Diana V.D. Kostic, Dusan Nicolae, Petre-Marian T. Popescu, Paul P.
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ITM Web of Conferences

Acquired electrical waveforms can be affected by white noise. The 1-st part of the paper analysis deals with the denoising of multi-period steady signals by using 3 methods: mean signal method, an original method relying on wavelet packet trees and the method implemented by the wavelet-based Matlab function wden. The signal length influence over th...

Bucur, Maria–Liliana
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In this work we study the next system: { S′=A−β(1+vI)SIE′=β(1+vI)SI−αEI′=αE−γIR′=γI $$\[\left\{ {\begin{array}{*{20}{l}}{S'}& = &{A - \beta \left( {1 + vI} \right)SI}\\{E'}& = &{\beta \left( {1 + vI} \right)SI - \alpha E}\\{I'}& = &{\alpha E - \gamma I}\\{R'}& = &{\gamma I}\end{array}} \right.\]$$ which is a SEIR model, where first of all the proba...

Tumanyan, Ani
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ITM Web of Conferences

This paper studies the Fredholm properties for a class of regular hypoelliptic operators. We establish necessary and suﬃcient conditions for a priori estimates for diﬀerential operators acting in multianisotropic Sobolev spaces in Rn. Fredholm criteria and index invariance are obtained for a wide class of regular hypoelliptic operators on the speci...

Babalic, Corina N.
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ITM Web of Conferences

The complete integrability of a multicomponent differentialdifference complex mKdV system with branched dispersion relation is proven. We use two approaches for this purpose. The first one is the Hirota bilinear formalism that helps us construct the multi-soliton solutions for a system of any M coupled equations. The same soliton solutions can be o...

Musafirov, Eduard Grin, Alexander Pranevich, Andrei Munteanu, Florian Şterbeţi, Cătălin
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ITM Web of Conferences

We consider an autonomous three-dimensional quadratic ODE system with nine parameters, which is a generalization of the Langford system. We derive conditions under which this system has infinitely many limit cycles. First, we study the equilibrium points of such systems and their eigenvalues. Next, we prove the non-local existence of an infinite se...