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Záznamy kolekce (řazeno podle Datum zaslání v sestupně pořadí): 1 až 20 z 124
Rendlová, Zdeňka
The dynamic behavior of the fast rotating system in dependence on operating parameters of bearing supports

Typical components of many industrial devices are rotating parts. In case of automotive engines, turbochargers are used in order to increase the engine efficiency. These turbochargers are understood as relatively small rotating parts working in aggressive conditions. Although they are usually...

Polach, Pavel , Hajžman, Michal , Bulín, Radek
Selected problems solved in Pilsen using multibody dynamics

The paper informs on some problems solved during approximately past twenty years in Pilsen using multibody simulations. Naturally, the list of activities is not comprehensive, it concerns activities of the authors in Výzkumný a zkušební ústav Plzeň s.r.o. and in the Department of M...

Pecka, Aleš , Bublík, Ondřej , Vimmr, Jan
FlowPro: multipurpose CFD software written in Java

FlowPro is a multipurpose open-source CFD software, which is being developed by the researchers of the Department of Mechanics of the Faculty of Applied Sciences at the University ofWest Bohemia. FlowPro is designed to solve various non-linear systems of hyperbolic-parabolic partial differen...

Lukeš, Vladimír , Zemčík, Hana
Identification of material parameters using homogenization approach and SfePy software

The finite element solver SfePy and Python modules are used to identify the material parameters of the carbon fibers and the epoxy matrix which constitute a unidirectional long-fiber composite. The mathematical model of the heterogeneous structure is base on two-scale homogenization method&#...

Bizzarri, Michal , Lávička, Miroslav
Rational adaptive blends among obstacles in 3D by contour method

In this paper we will continue in investigating ‘contour method’ and its using for the computation of rational parameterizations of canal surfaces without a need of sum of squares (SOS) decomposition. Further approaches for constructing flexible smooth transitions between canal surfaces will...

Bizzarri, Michal , Lávička, Miroslav , Kosinka, Jiří
Skinning and blending with rational envelope surfaces

We continue the study of rational envelope (RE) surfaces. Although these surfaces are parametrized with the help of square roots, when considering an RE patch as the medial surface transform in 4D of a spatial domain it yields a rational parametrization of the domain’s boundar...

Bizzarri, Michal , Lávička, Miroslav , Šír, Zbyněk , Vršek, Jan
Hermite interpolation by piecewise polynomial surfaces with polynomial area element

This paper is devoted to the construction of polynomial 2-surfaces which possess a polynomial area element. In particular we study these surfaces in the Euclidean space R^3 (where they are equivalent to the PN surfaces) and in the Minkowski space R^{3,1} (where they provide th...

Semaničová-Feňovčíková, Andrea , Bača, Martin , Lacsáková, Marcela , Millerová, Miroslava , Ryan, Joe
Kola jsou cyklicky antimagická

A simple graph G admits an H-covering if every edge in E(G) belongs to a subgraph of G isomorphic to H. An (a, d)-H-antimagic total labeling of a graph G admitting an H-covering is a bijective function from the vertex set V(G) and the edge set E(G) of the&#...

Bača, Martin , Millerová, Miroslava , Ryan, Joe , Semabičová-Feňovčíková, Andrea
H-antimagické nesouvislé grafy

A simple graph G admits an H-covering if every edge in E(G) belongs to a subgraph of G isomorphic to H. An (a, d)-H-antimagic total labeling of a graph G admitting an H-covering is a bijective function from the vertex set V(G) and the edge set E(G) of the&#...

Abjavay, J. , Kelarev, A.V. , Millerová, Miroslava , Ryan, Joseph
Reesovy pologrupy orientovaných grafů pro klasifikaci dat

Recent research has motivated the investigation of the weights of ideals in semiring constructions based on semigroups. The present paper introduces Rees semigroups of directed graphs. This new construction is a common generalization of Rees matrix semigroups and incidence semigroups of digr...

Volek, Jonáš
Landesman-Lazerovy podmínky pro diferenční rovnice se sublineárními perturbacemi

We study the existence and uniqueness for discrete Neumann and periodic problems. We consider both ordinary and partial difference equations involving sublinear perturbations. All the proofs are based on reformulating these discrete problems as a general singular algebraic system. Firstly, we...

Zeman, Vladimír , Hlaváč, Zdeněk
Mathematical modelling of friction-vibration interactions of nuclear fuel rods

Nuclear fuel rods (FRs) are transverselly linked to each other by three spacer grid cells at several vertical levels inside a fuel assembly (FA). Vibration of FA components, caused by the motion of FA support plates in the reactor core, generates variable contact forces betwee...

Hajžman, Michal , Bulín, Radek , Svatoš, Petr , Šika, Zbyněk
Usage of the particle swarm optimization in problems of mechanics

This paper deals with the optimization method called particle swarm optimization and its usage in mechanics. Basic versions of the method is introduced and several improvements and modifications are applied for better convergence of the algorithms. The performance of the optimization algorit...

Karpov, Alexey , Tsirulnik, Liliya , Krňoul, Zdeněk , Ronzhin, Andrey , Lobanov, Boris , Železný, Miloš
Audio-visual speech asynchrony modeling in a talking head

An audio-visual speech synthesis system with modeling of asynchrony between auditory and visual speech modalities is proposed in the paper. Corpus-based study of real recordings gave us the required data for understanding the problem of modalities asynchrony that is partially caused by ...

Campr, Pavel , Pražák, Aleš , Psutka, Josef V. , Psutka, Josef
Online speaker adaptation of an acoustic model using face recognition

We have proposed and evaluated a novel approach for online speaker adaptation of an acoustic model based on face recognition. Instead of traditionally used audio-based speaker identification we investigated the video modality for the task of speaker detection. A simulated on-lin...

Tihelka, Daniel , Hanzlíček, Zdeněk , Machač, Pavel , Skarnitzl, Radek , Matoušek, Jindřich
On the impact of labialization contexts on unit selection speech synthesis

This paper presents a study on coarticulatory labialization and the significance of its respecting/violation during selection and concatenation of speech units in the unit selection speech synthesis. The aim of this study is to improve the overall speech quality, especially to increase&...

Goubej, Martin , Škarda, Radek , Schlegel, Miloš
Input shaping filters for the control of electrical drive with flexible load

This paper deals with control of flexible mechanical systems. The goal is to modify the input signal in order to minimize the residual vibrations excited during a motion of a system with flexible parts. The filter is designed in the time domain via impulse function analys...

Grůber, Martin , Legát, Milan , Tihelka, Daniel
Corpus recording and checking on the recorded data

This paper describes a part of speech corpus recording procedure. It focuses on the supervision during the corpus recording and the checking on the recorded data. Several modifications of used software are presented.

Grůber, Martin , Tihelka, Daniel , Matoušek, Jindřich
Evaluation of various unit types in the unit selection approach for the Czech language using the Festival system

The present paper focuses on the utilization of concatenative speech synthesis, aiming to determine and compare the influence on the synthesized speech quality when various unit types are used in the unit selection approach. There are several unit types which can be used for t...

Grůber, Martin , Legát, Milan
Single speaker acoustic analysis of czech speech for purposes of emotional speech synthesis

This paper deals with an acoustic analysis of the sets of Czech sentences uttered by single speaker. The data used in this analysis consists of both emotional and neutral sentences. We have been especially interested in some features which are supposed to influence the percept...

Záznamy kolekce (řazeno podle Datum zaslání v sestupně pořadí): 1 až 20 z 124