Scenarios for the spread of COVID-19 analyzed by the TVBG-SEIR spline model
O Kounchev, G Simeonov, Z Kuncheva - Biomath, 2021 - biomath.math.bas.bg
We develop a novel TVBG-SEIR spline model for analysis of the coronavirus infection (COVID-19).
It aims to analyze the long-term global evolution of the epidemics" controlled" by the …
It aims to analyze the long-term global evolution of the epidemics" controlled" by the …
[BOOK][B] Multivariate polysplines: applications to numerical and wavelet analysis
O Kounchev - 2001 - books.google.com
Multivariate polysplines are a new mathematical technique that has arisen from a synthesis
of approximation theory and the theory of partial differential equations. It is an invaluable …
of approximation theory and the theory of partial differential equations. It is an invaluable …
Shape preserving properties of generalized Bernstein operators on extended Chebyshev spaces
JM Aldaz, O Kounchev, H Render - Numerische Mathematik, 2009 - Springer
We study the existence and shape preserving properties of a generalized Bernstein operator
B n fixing a strictly positive function f 0 , and a second function f 1 such that f 1 /f 0 is strictly …
B n fixing a strictly positive function f 0 , and a second function f 1 such that f 1 /f 0 is strictly …
Estimation of the duration of COVID-19 epidemic in a single country, with or without vaccinations. the case of Bulgaria and Germany.
O Kounchev, G Simeonov, Z Kuncheva - 2021 - cabidigitallibrary.org
In the present paper we develop a methodology for the estimation of the duration of the
Epidemic of Covid-19 in a single country, with or without vaccinations, accounting for different …
Epidemic of Covid-19 in a single country, with or without vaccinations, accounting for different …
The TVBG-SEIR spline model for analysis of COVID-19 spread, and a Tool for prediction scenarios
O Kounchev, G Simeonov, Z Kuncheva - arXiv preprint arXiv:2004.11338, 2020 - arxiv.org
Mathematical models are traditionally used to analyze the long-term global evolution of
epidemics, to determine the potential and severity of an outbreak, and to provide critical …
epidemics, to determine the potential and severity of an outbreak, and to provide critical …
[HTML][HTML] Regularity of generalized Daubechies wavelets reproducing exponential polynomials with real-valued parameters
N Dyn, O Kounchev, D Levin, H Render - Applied and Computational …, 2014 - Elsevier
We investigate non-stationary orthogonal wavelets based on a non-stationary interpolatory
subdivision scheme reproducing a given set of exponentials with real-valued parameters. …
subdivision scheme reproducing a given set of exponentials with real-valued parameters. …
Polyharmonic functions of infinite order on annular regions
O Kounchev, H Render - Tohoku Mathematical Journal, Second …, 2013 - jstage.jst.go.jp
Polyharmonic functions f of infinite order and type τ on annular regions are systematically
studied. The first main result states that the Fourier-Laplace coefficients fk, l (r) of a …
studied. The first main result states that the Fourier-Laplace coefficients fk, l (r) of a …
Bernstein operators for exponential polynomials
JM Aldaz, O Kounchev, H Render - Constructive Approximation, 2009 - Springer
Let L be a linear differential operator with constant coefficients of order n and complex
eigenvalues λ 0 ,…,λ n . Assume that the set U n of all solutions of the equation Lf=0 is closed …
eigenvalues λ 0 ,…,λ n . Assume that the set U n of all solutions of the equation Lf=0 is closed …
Nationwide analysis of the impact of COVID-19 in patients with a cardiovascular, oncological or chronic pulmonary disease in the context of an Eastern European …
G Dimitrov, T Valkov, H Batselova, O Kounchev… - BMJ open, 2023 - bmjopen.bmj.com
Objective This study focused on Bulgarian patient cohorts harbouring a single documented
chronic comorbidity–cardiovascular pathology, an oncological disease or a chronic …
chronic comorbidity–cardiovascular pathology, an oncological disease or a chronic …
[HTML][HTML] Kounchev, Ognyan
O Kounchev, H Render - American Mathematical Society, 2004 - researchrepository.ucd.ie
We show that the scaling spaces de ned by the polysplines of order p provide approximation
order 2p: For that purpose we re ne the re-sults on one dimensional approximation order by …
order 2p: For that purpose we re ne the re-sults on one dimensional approximation order by …