Browsing by Publisher "Institute of Mathematics and Informatics"
Dabar rodomi įrašai 1-20 iš 41
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Adapted SETAR model for Lithuanian HCPI time series
(Nonlinear analysis : modelling and control, 2012)We present adapted SETAR (self-exciting threshold autoregressive) model, which enables simultaneous estimation of nonlinearity and unobserved time series components. This model was tested on real Lithuanian harmonised ... -
An optimization of system for automatic recognition of ischemic stroke areas in computed tomography images
(Informatica, 2007)The paper considers application of stochastic optimization to system of automatic recognition of ischemic stroke area on computed tomography (CT) images. The algorithm of recognition depends on five inputs that influence ... -
Analogue modelling an array of the FitzHugh–Nagumo oscillators
(Nonlinear analysis : modelling and control, 2012)The purpose of the paper is to show that analogue electronic modelling is an extremely fast technique compared to conventional digital computing, especially when solving large sets of coupled nonlinear differential equations. ... -
Asymptotic Analysis of Weakly Nonlinear Systems
(Finite Difference Schemes Theory and Applications : proceedings of the conference FDS 2000, September 1-4, 2000, Palanga, 2000)A method of averaging for getting a uniformly valid asymptotic approximation of the solution of the nonlinear wave equation is presented. Using this method we get the averaged system of equations, withch disintegrates into ... -
Asymptotic solution of the mathematical model of nonlinear oscillations of absolutely elastic inextensible weightless string
(Nonlinear analysis : modelling and control, 2010)The mathematical model of nonlinear oscillations of weightless string is analyzed. To find an asymptotic solution of the problem, uniformly valid in a long interval of time, an averaged system of integral differential ... -
Asymptotic solutions of the mathematical model of nonlinear oscillations of absolutely elastic inextensible weightless string
(Nonlinear analysis : modelling and control / Lithuanian Association of Nonlinear Analysts; Lithuanian Academy of Science, 2010)The mathematical model of nonlinear oscillations of weightless string is analyzed. To find an asymptotic solution of the problem, uniformly valid in a long interval of time, an averaged system of integral differential ... -
Asymtotic expansions for the distribution and density functions of the quadratic form of a stationary Gaussian process in the large deviation Cramer zone
(Nonlinear analysis : modelling and control, 2001) -
Biosensor response at mixed enzyme kinetics and external diffusion limitation in case of substrate inhibition
(Nonlinear analysis: modelling and control, 2006)The action of a biosensor containing non Michaelis-Menten enzyme was modeled at mixed enzyme kinetics and external diffusion limitation in the case of substrate inhibition. The calculations show that at the electrode surface ... -
Decision support using belief network constructed from business process event log
(Informatica, 2017)Information systems contain a lot of data regarding business process execution history. Use of this data, in the form of an event log, can greatly support business process management. The paper presents an approach to ... -
Econometrical modelling of profit tax revenue
(Nonlinear analysis: modelling and control, 2007)The aim of this article is to present a forecast of budget revenue from the profit tax using econometric models. The set of applied models has to be reduced to very simple models due to short time series used. Therefore, ... -
Estimation of the current population total for a four-phase sampling design
(Nonlinear analysis: modelling and control, 2016)The combined ratio-type estimators of the finite population total and their variances in the case of sample rotation for two-phase and four-phase sampling schemes are constructed in the paper. Combined estimators of the ... -
Expansions in Appell polynomials of the convolutions of probability distributions
(Nonlinear analysis: modelling and control, 2013)We use the composition method to analyse the convolutions of probability distributions by emploing the Appell polynomials and Bergström identity. Our approximation is based on the probability distributions which have the ... -
Free software in science and study organisation
(2nd International Conference Informatics in Secondary Schools: evolution and perspectives, November 7-11, 2006, Vilnius, Lithuania, 2006)Does software regulate our work, or do we have to set requirements to the software so we can work successfully? Why should teachers, lectures and scientists get acquainted with Free Software or Open Source Software design, ... -
Grey best-worst method for multiple experts multiple criteria decision making under uncertainty
(Informatica, 2020)In practice, the judgments of decision-makers are often uncertain and thus cannot be represented by accurate values. In this study, the opinions of decision-makers are collected based on grey linguistic variables and the ... -
Investigation of accuracy of a calibrated estimator of a ratio by modelling
(Nonlinear analysis : modelling and control, 2005)Estimator of finite population parameter – ratio of totals of two variables – is investigated by modelling in the case of simple random sampling. Traditional estimator of the ratio is compared with the calibrated estimator ... -
Investigation of symmetric non-spherical particle shapes by applying low-resolution spherical harmonics
(Nonlinear analysis : modelling and control, 2017)The issue of mathematical modelling of non-spherical shapes of particles is considered. Thus, application of the spherical harmonics (SH) technique in modelling the simplest symmetric star-shaped particles is demonstrated ... -
Kinetic model of biphasic character of catalyse inhibition
(Nonlinear analysis : modelling and control, 2003) -
Learning content and software evaluation and personalisation problems
(Informatics in education, 2010)The paper aims to analyse several scientific approaches how to evaluate, implement or choose learning content and software suitable for personalised users/learners needs. Learning objects metadata customisation method as ... -
Linearly invariant classes of functions analytical in the half-plane
(Nonlinear analysis : modelling and control, 2004)In present paper the properties of classes of introduced by authors functions analytical in the half-plane are investigated. These classes constructed by using special normalization of functions, automorphismof the half-plane ... -
Modeling Enzymes inhibition during microparticles formation
(Nonlinear analysis : modelling and control, 2003)A mathematical model of enzymes inhibition during microparticles formation has been developed. The model is based on radial substrate diffusion through diffusion layer that surrounds microparticle. The inhibition of enzymes ...