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pro vyhledávání: '"Copelli M"'
In the last decade, several models with network adaptive mechanisms (link deletion-creation, dynamic synapses, dynamic gains) have been proposed as examples of self-organized criticality (SOC) to explain neuronal avalanches. However, all these system
Externí odkaz:
http://arxiv.org/abs/1803.05537
Publikováno v:
Physica A, 342, 263-269 (2004)
We study a simple map as a minimal model of excitable cells. The map has two fast variables which mimic the behavior of class I neurons, undergoing a sub-critical Hopf bifurcation. Adding a third slow variable allows the system to present bursts and
Externí odkaz:
http://arxiv.org/abs/q-bio/0402031
Publikováno v:
Int. J. Mod. Phys. C, 13, 783-797 (2002)
Complementarity is one of the main features underlying the interactions in biological and biochemical systems. Inspired by those systems we propose a model for the dynamical evolution of a system composed by agents that interact due to their compleme
Externí odkaz:
http://arxiv.org/abs/cond-mat/0110350
Publikováno v:
Phys. Rev. E Vol. 65, 036611 (2002)
We revisit the mean field model of globally and harmonically coupled parametric oscillators subject to periodic block pulses with initially random phases. The phase diagram of regions of collective parametric instability is presented, as is a detaile
Externí odkaz:
http://arxiv.org/abs/cond-mat/0102113
Autor:
Copelli, M., Broeck, C. Van den
Publikováno v:
Phys. Rev. E, 61, 6971-6980 (2000)
We study a model of unsupervised learning where the real-valued data vectors are isotropically distributed, except for a single symmetry breaking binary direction $\bm{B}\in\{-1,+1\}^{N}$, onto which the projections have a Gaussian distribution. We s
Externí odkaz:
http://arxiv.org/abs/cond-mat/9910365
Publikováno v:
J. Stat. Phys. 101, 415-424 (2000)
We derive the explicit analytic expression for the Stokes' drift in one dimension in the presence of a dichotomic Markov forcing. For small amplitudes of the forcing, the drift is enhanced, but the enhancement is reduced with increasing frequency of
Externí odkaz:
http://arxiv.org/abs/cond-mat/9908338
Publikováno v:
J. Phys. A: Math. Gen. 32, L555-L560 (1999)
We study a simple model of unsupervised learning where the single symmetry breaking vector has binary components $\pm 1$. We calculate exactly the Bayes-optimal performance of an estimator which is required to lie in the same discrete space. We also
Externí odkaz:
http://arxiv.org/abs/cond-mat/9906356
Publikováno v:
Europhys. Lett., 47 (2) 139-144 (1999)
We show that the center of mass of Ising vectors that obey some simple constraints, is again an Ising vector.
Comment: 8 pages, 3 figures, LaTeX; Claims in connection with disordered systems have been withdrawn; More detailed description of the
Comment: 8 pages, 3 figures, LaTeX; Claims in connection with disordered systems have been withdrawn; More detailed description of the
Externí odkaz:
http://arxiv.org/abs/cond-mat/9902102
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