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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 38
Bastl, Bohumír , Brandner, Marek , Egermaier, Jiří , Horníková, Hana , Slabá, Kristýna , Šourek, Jan , Turnerová, Eva
Comparison of Coupled and Decoupled Solvers for Incompressible Navier–Stokes Equations Solved by Isogeometric Analysis

This paper is devoted to the problem of solving the steady incompressible Navier–Stokes equations discretized by the Galerkin method on the spaces generated by the B-spline/NURBS basis functions, which is called isogeometric analysis. Two pressure-correction methods are presented for the sol...

Nedela, Roman , Ponomarenko, Ilia
Recognizing and Testing Isomorphism of Cayley Graphs over an Abelian Group of Order 4p in Polynomial Time

We construct a polynomial-time algorithm that, for a graph X with 4p We construct a polynomial-time algorithm that for a graph X with 4p vertices (p is prime), finds (if any) a Cayley representation of X over the group C2 × C2 × Cp. This result, together with&#x...

Tomiczek, Petr
Second order problem with ALP condition and unbounded nonlinearities

The nonlinear second order ordinary differential equation u''(x) + m^2 u(x) + g(x, u(x)) = f(x) , x in [0, p] , u(0) = u(p) = 0 is investigated in this article. We suppose that the nonlinearity g is unbounded and satisfies an ALP type condition. We prove...

Bastl, Bohumír , Egermaier, Jiří , Brandner, Marek , Horníková, Hana , Slabá, Kristýna , Turnerová, Eva
Gradient-free and gradient-based methods for shape optimization of water turbine blade

The purpose of our work is to develop an automatic shape optimization tool for runner wheel blades in reaction water turbines, especially in Kaplan turbines. The fluid flow is simulated using an in-house incompressible turbulent flow solver based on recently introduced isogeometric anal...

Brandner, Marek , Knobloch, Petr
Some remarks concerning stabilization techniques for convection–diffusion problems

There are many methods and approaches to solving convection– diffusion problems. For those who want to solve such problems the situation is very confusing and it is very difficult to choose the right method. The aim of this short overview is to provide basic guidelines an...

Ťoupal, Tomáš , Šedivá, Blanka
Multivariate nonparametric kernel estimation

This paper is focused on multivariate estimation of density and distribution function by nonparametric kernel approach. The main goal is to describe univariate and multivariate nonparametric kernel estimation using selected kernel functions and smoothing parameters including a real application. The&#x...

Šedivá, Blanka , Ťoupal, Tomáš
Outlier detection techniques in multidimensional datasets

Outliers can significantly impact data summarization results and data analysis across all types of data analysis. Identifying outliers in multidimensional data is, therefore, one of the key approaches in data preprocessing. across all types of data analysis. In this article, we present ...

Hruda, Lukáš , Kolingerová, Ivana , Lávička, Miroslav
Plane Space Representation in Context of Mode-Based Symmetry Plane Detection

This paper describes various representations of the space of planes. The main focus is on the plane space representation in the symmetry plane detection in E3 where many candidate planes for many pairs of points of the given object are created and then the most often ...

Marek, Patrice , Marková, Věra
Optimization and Testing of Money Flow Index

The paper deals with whether the Money Flow Index (MFI) can still be used successfully for trading, and whether the parameters recommended in the literature are the best that an investor can use. Simulations in randomized time interval for the largest companies in the S&P&...

Marek, Patrice , Šedivá, Blanka
Optimization and Testing of RSI

This paper deals with the Relative Strength Index (RSI), a popular oscillator. It answers the question whether – almost 40 years after its publication – the RSI can be still useful in trading. To answer this question, we compare four strategies: RSI with recommended parameters...

Vávra, František , Ťoupal, Tomáš
Konkordance mezi časovými řadami kurzů měn, statisticko-pravděpodobnostní pohled.

The paper presents one of the possible methodologies for comparing two time series by estimating the probability that both series will increase or decrease (in probability) synchronously. This procedure is analogous to the specific measures of dependence (concordance) between random variables...

Nečesal, Petr , Kadlec, Jiří
The Fučík Spectrum as Two Regular Curves

In this paper, we investigate the structure of the Fučík Spectrum for the second order boundary value problem with one non-local boundary condition. We provide a new compact form of the implicit description of the Fučík Spectrum in the first quadrant. Presented compact form of...

Šedivá, Blanka , Vávra, František
Risk events for two random processes

The problem when a random variable exceeds some boundary is very often studied problem in many fields of science. The classical approach focuses on situation when random variable overlap a fix value. More general methods interested in situation with two random variables and the...

Tomiczek, Petr
Second order problem with a symmetric nonlinearity

The purpose of this work is to study the existence of a solution to the nonlinear second order ordinary differential equation u''(x) + m2 u(x) + g(x, u) = f(x) , x ∈ [0, T] , u(0) = u(π) = 0 , where m ∈ N, g is a Carathéodory function,...

Ťoupal, Tomáš
Nonparametric Kernel Regression Approach

This paper is focused on a possible methodology for estimating of regression curve by nonparametric kernel regression approach. The main objective is a description of nonparametric regression function with using Nadaraya-Watson approach including a real data application for beer consumption in&#x...

Marek, Patrice , Vávra, František
Sports Betting Arbitrage in English Football

The paper investigates sports betting arbitrage and demonstrates it on data from English football between seasons 2013–14 and 2017–18. Several strategies of arbitrage betting are proposed, e.g., preference for favourite or outsider, and they are used for betting in four top level Englis...

Zemčík, Robert , Bartošek, Jan , Kroupa, Tomáš
Impact reconstruction and localization on laminated structure

Finite element model of an airfoil segment made of laminated glass fiber composite is created. The model is calibrated using data from experimental tests, namely the modal characteristics and vibrations measured with laser sensors in selected locations. Passive monitoring method is applied&#...

Ťoupal, Tomáš , Šedivá, Blanka
Possible comparison between two time series

This paper is focused on the possible methodologies for comparing two time series by estimating the probability that both time series will increase or decrease (of course in probability) in the same time. It can be considered as the specific measure of dependence (more precise...

Matas, Richard , Syka, Tomáš , Hurda, Lukáš
Experimental investigation and numerical modelling of 3D radial compressor stage and influence of the technological holes on the working characteristics

The article deals with a description of results from research and development of a radial compressor stage with 3D rotor blades. The experimental facility and the measurement and evaluation process is described briefly in the first part. The comparison of measured and computed charac...

Janoušek, Jakub
Comparison of known existence results for one-dimensional beam models of suspension bridges

The aim of this paper is to present our recent existence and uniqueness results for a one-dimensional damped model of a suspension bridge and compare them to previous results for either damped or non-damped one-dimensional beam models.

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 38