نتایج جستجو برای: local stability
تعداد نتایج: 818164 فیلتر نتایج به سال:
An epidemic model with optimal control strategies was investigated for Hepatitus C Viral disease that can be transmitted through infected individuals. In this study, we used a deterministic compartmental model for assessing the effect of different optimal control strategies for controlling the spread of Hepatitus C disease in the community. Stability theory of differential equations is us...
This paper considers local stability properties of systems comprising stable linear time-invariant operators in combination with a scalar nonlinearity. We consider those nonlinearities whose gain can be related to the peak value of their input signal. It is assumed that the nonlinearity has some nominal gain for small signals (ie with peak value less than some number), and that the gain then in...
Many problems that arise in machine learning and data mining domains deal with nonlinearity and quite often demand users to obtain global optimal solutions rather than local optimal ones. Several algorithms had been proposed in the optimization literature and inherited by the machine learning community. Popularly known as the initialization problem, the ideal set of parameters required will sig...
Temporal stability of ecosystem functioning increases the predictability and reliability of ecosystem services, and understanding the drivers of stability across spatial scales is important for land management and policy decisions. We used species-level abundance data from 62 plant communities across five continents to assess mechanisms of temporal stability across spatial scales. We assessed h...
The "'calculus" of inclusive fitness (Hamilton, 1964, t970, 1972) provides a powerful method, both conceptually and computationally, o f modeling social behavior. An important question concerns the extent to which inclusive fitness models are able to give the same results as genetic models. There is quite a general result, various versions of which have been discussed by Hamil ton (1970, 1979),...
We study the structure of unstable local effectivity functions defined for n players and p alternatives. A stability index based on the notion of cycle is introduced. In the particular case of simple games, the stability index is closely related to the Nakamura Number. In general it may be any integer between 2 and p. We prove that the stability index for maximal effectivity functions and for m...
In this paper we determine which germs of differential îforms on an n-manifold are stable (in the sense of Martinet). We show that when s ¥= 1 or when 4=1 and n < 4 Martinet had found almost all of the possible examples. The most interesting result states that for certain generic singularities of 1-forms on 4-manifolds an infinite dimensional moduli space occurs in the classification of the 1-f...
The behavior of a minimizing point when an objective function is tilted by adding a small linear term is studied from the perspective of second-order conditions for local optimality. The classical condition of a positive-definite Hessian in smooth problems without constraints is found to have an exact counterpart much more broadly in the positivity of a certain generalized Hessian mapping. This...
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