Grzegorz Graff - Profil naukowy - MOST Wiedzy

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Wybrane publikacje

  • Entropy Measures in the Assessment of Heart Rate Variability in Patients with Cardiodepressive Vasovagal Syncope

    - ENTROPY-SWITZ - 2015

    Sample entropy (SampEn) was reported to be useful in the assessment of the complexity of heart rate dynamics. Permutation entropy (PermEn) is a new measure based on the concept of order and was previously shown to be accurate for short, non-stationary datasets. The aim of the present study is to assess if SampEn and PermEn obtained from baseline recordings might differentiate patients with various outcomes of the head-up tilt test...

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  • Minimal number of periodic points of smooth boundary-preserving self-maps of simply-connected manifolds

    Let M be a smooth compact and simply-connected manifold with simply-connected boundary ∂M, r be a fixed odd natural number. We consider f, a C1 self-map of M, preserving ∂M . Under the assumption that the dimension of M is at least 4, we define an invariant Dr(f;M,∂M) that is equal to the minimal number of r-periodic points for all maps preserving ∂M and C1-homotopic to f. As an application, we give necessary and sufficient...

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  • Computing algebraic transfer entropy and coupling directions via transcripts

    • J. Amigó
    • R. Monetti
    • B. Graff
    • G. Graff

    - CHAOS - 2016

    Most random processes studied in nonlinear time series analysis take values on sets endowed with a group structure, e.g., the real and rational numbers, and the integers. This fact allows to associate with each pair of group elements a third element, called their transcript, which is defined as the product of the second element in the pair times the first one. The transfer entropy of two such processes is called algebraic transfer...

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Uzyskane stopnie/tytuły naukowe

  • 2010-04-09

    Nadanie stopnia naukowego

    dr hab. Matematyka (Dziedzina nauk matematycznych)
    Uniwersyteet Adama Mickiewicza

wyświetlono 378 razy