Number of found documents: 624
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Appearance Acquisition and Analysis of Effect Coatings
Filip, Jiří; Maile, F. J.
2017 - English
Keywords: effect coatings; appearance capturing; polychromatic; particle orientation Fulltext is available at external website.
Appearance Acquisition and Analysis of Effect Coatings

Filip, Jiří; Maile, F. J.
Ústav teorie informace a automatizace, 2017

Sledování creepových změn na tepelně a mechanicky namáhaném vzorku oceli pomocí akustické emise
Tichavský, Petr
2017 - Czech
Zpráva popisuje data získaná pří experimentu s tepelným a mechanickým namáháním vzorku oceli za účelem detekce creepových změn v materiálu. The report describes the data obtained in the heat and mechanical steel specimen strain experiment to detect creep changes in the material. Keywords: akustika Fulltext is available at external website.
Sledování creepových změn na tepelně a mechanicky namáhaném vzorku oceli pomocí akustické emise

Zpráva popisuje data získaná pří experimentu s tepelným a mechanickým namáháním vzorku oceli za účelem detekce creepových změn v materiálu....

Tichavský, Petr
Ústav teorie informace a automatizace, 2017

Sledování creepových změn na tepelně a mechanicky namáhaném vzorku oceli pomocí akustické emise II
Tichavský, Petr
2017 - Czech
Zpráva popisuje data získaná pří experimentu s tepelným a mechanickým namáháním vzorku oceli za účelem detekce creepových změn v materiálu. Akustická emise byla snímána současně dvěmi snímači. The report describes the data obtained in the heat and mechanical steel specimen experiment to detect creep changes in the material. The acoustic emission was simultaneously recorded from two sensors. Keywords: akustická emise Fulltext is available at external website.
Sledování creepových změn na tepelně a mechanicky namáhaném vzorku oceli pomocí akustické emise II

Zpráva popisuje data získaná pří experimentu s tepelným a mechanickým namáháním vzorku oceli za účelem detekce creepových změn v materiálu. Akustická emise byla snímána současně dvěmi snímači....

Tichavský, Petr
Ústav teorie informace a automatizace, 2017

Multi-period Factor Model of a Loan Portfolio
Šmíd, Martin; Dufek, J.
2017 - English
We construct a general dynamic model of losses of a large loan portfolio, secured by collaterals. In the model, the wealth of a debtor and the price of the corresponding collateral depend each on two factors: a common one, having a general distribution, and an individual one, following an AR(1) process. The default of a loan happens if the wealth stops to be su cient for repaying the loan. We show that the mapping transforming the common factors into the probability of default (PD) and the loss given default (LGD) is one-to-one twice continuously differentiable. As the transformation is not analytically tractable, we propose a numerical technique for its computation and demonstrate its accuracy by a numerical study.\nWe show that the results given by our multi-period model may differ signi cantly from\nthose resulting from single-period models, and demonstrate that our model naturally replicates\nthe empirically observed decrease of PDs within a portfolio in time. In addition, we give a formula for the overall loss of the portfolio and, as an example of its application, we formulate a simple optimal scoring decision problem and discuss its solution. Keywords: Credit Risk; Structural Factor Models; Loan Portfolio Management Fulltext is available at external website.
Multi-period Factor Model of a Loan Portfolio

We construct a general dynamic model of losses of a large loan portfolio, secured by collaterals. In the model, the wealth of a debtor and the price of the corresponding collateral depend each on two ...

Šmíd, Martin; Dufek, J.
Ústav teorie informace a automatizace, 2017

Analýza korozního poškození potrubí s proudící párou pomocí akustické emise:\nteoretická východiska a první výsledky
Tichavský, Petr
2017 - Czech
Zpráva popisuje první vysledky analýzy dat akustické emise získané měřením na parovodním potrubí v Atomové elektrárně Jaslovské Bohunice pořízené za účelem zkoumání korozního poškození potrubí. The report describes the first results of the analysis of the acoustic emission data obtained by measuring the steam pipeline at the Jaslovské Bohunice Atomic Power Plant, which was made for the purpose of investigation of corrosion damage to the pipeline. Keywords: acoustic emission Fulltext is available at external website.
Analýza korozního poškození potrubí s proudící párou pomocí akustické emise:\nteoretická východiska a první výsledky

Zpráva popisuje první vysledky analýzy dat akustické emise získané měřením na parovodním potrubí v Atomové elektrárně Jaslovské Bohunice pořízené za účelem zkoumání korozního poškození ...

Tichavský, Petr
Ústav teorie informace a automatizace, 2017

Odhad rychlosti šíření akustických vln ve vzorku oceli pro sledování creepových změn pomocí akustické emise
Tichavský, Petr; Slunéčko, T.; Svobodová, M.; Chmela, T.
2017 - Czech
Zpráva popisuje měření rychlosti šíření zvuku ve vzorku materiálu podrobeném tepelnému a mechanickému namáhání pomocí signálu akustické emise. The report describes the measurement of the sound propagation velocity in a sample of material subjected to heat and mechanical stress by means of an acoustic emission. Keywords: sound propagation Fulltext is available at external website.
Odhad rychlosti šíření akustických vln ve vzorku oceli pro sledování creepových změn pomocí akustické emise

Zpráva popisuje měření rychlosti šíření zvuku ve vzorku materiálu podrobeném tepelnému a mechanickému namáhání pomocí signálu akustické emise....

Tichavský, Petr; Slunéčko, T.; Svobodová, M.; Chmela, T.
Ústav teorie informace a automatizace, 2017

Diffusion MCMC for Mixture Estimation
Reichl, Jan; Dedecius, Kamil
2016 - English
Distributed inference of parameters of mixture models by a network of cooperating nodes (sensors) with computational and communication capabilities still represents a challenging task. In the last decade, several methods were proposed to solve this issue, predominantly formulated within the expectation-maximization framework and with the assumption of mixture components normality. The present paper adopts the Bayesian approach to inference of general (non-normal) mixtures via the Markov chain Monte Carlo simulation from the parameter posterior distribution. By collaborative tuning of node chains, the method allows reliable estimation even at nodes with significantly worse observational conditions, where the components may tend to merge due to high variances. The method runs in the diffusion networks, where the nodes communicate only with their adjacent neighbors within 1 hop distance. Keywords: Mixture; mixture estimation; MCMC Fulltext is available at external website.
Diffusion MCMC for Mixture Estimation

Distributed inference of parameters of mixture models by a network of cooperating nodes (sensors) with computational and communication capabilities still represents a challenging task. In the last ...

Reichl, Jan; Dedecius, Kamil
Ústav teorie informace a automatizace, 2016

Basic facts concerning extreme supermodular functions
Studený, Milan
2016 - English
Elementary facts and observations on the cone of supermodular set functions are recalled. The manuscript deals with such operations with set functions which preserve supermodularity\nand the emphasis is put on those such operations which even preserve extremality (of a supermodular function). These involve a few self-transformations of the cone of supermodular set functions. Moreover, projections to the (less-dimensional) linear space of set functions for a subset of the variable set are discussed. Finally, several extensions to the (more-dimensional) linear space of set functions for a superset of the variable set are shown to be both preserving supermodularity and extremality. Keywords: supermodular function; standardizations; extreme supermodular function Fulltext is available at external website.
Basic facts concerning extreme supermodular functions

Elementary facts and observations on the cone of supermodular set functions are recalled. The manuscript deals with such operations with set functions which preserve supermodularity\nand the emphasis ...

Studený, Milan
Ústav teorie informace a automatizace, 2016

Adaptive Blind Separation of Instantaneous Linear Mixtures of Independent Sources
Šembera, Ondřej; Tichavský, Petr; Koldovský, Zbyněk
2016 - English
In many applications, there is a need to blindly separate independent sources from their linear instantaneous mixtures while the mixing matrix or source properties are slowly or abruptly changing in time. The easiest way to separate the data is to consider off-line estimation of the model parameters repeatedly in time shifting window. Another popular method is the stochastic natural gradient algorithm, which relies on non-Gaussianity of the separated signals and is adaptive by its nature. In this paper, we propose an adaptive version of two blind source separation algorithms which exploit non-stationarity of the original signals. The results indicate that the proposed algorithms slightly outperform the natural gradient in the trade-off between the algorithm’s ability to quickly adapt to changes in the mixing matrix and the variance of the estimate when the mixing is stationary. Keywords: blind separation; algorithms; block gaussian separation Fulltext is available at external website.
Adaptive Blind Separation of Instantaneous Linear Mixtures of Independent Sources

In many applications, there is a need to blindly separate independent sources from their linear instantaneous mixtures while the mixing matrix or source properties are slowly or abruptly changing in ...

Šembera, Ondřej; Tichavský, Petr; Koldovský, Zbyněk
Ústav teorie informace a automatizace, 2016

DCTOOL-A3
Bakule, Lubomír; Papík, Martin; Rehák, Branislav
2016 - English
DCTOOL-A3 is a documentation of Matlab routines developed for the design of decentralized control of large scale complex systems. The current beta version covers three areas as follows:\nReport 4.1 deals with the event-triggered control design for unstructured uncertain systems. Both non-quantized and quantized feedback is analyzed. The results are given in terms of linear matrix inequalities (LMIs). Logarithmic quantizer is used. Numerical example illustrates the effectiveness of the presented results.\nReport 4.2 presents a new decentralized overlapping wireless control design with a switched communication protocol. The method is applied by simulations on the 20-story building structure including the test of robustness of the methods against sensor failures and network node dropouts of a digital network.\nReport 4.3 presents the construction of a new decentralized wireless controller and a set of heuristic algorithms for evaluation of packet dropouts, sensor faults and actuator faults. The digital network operates at the standard frequency used in well-known widely-used industrial protocols. The results are tested at the Benchmark model decomposed into two disjoint substructures. The results are published. Thus, the details are omitted here. Keywords: event-triggered control; networked control systems; large scale complex systems Available at various institutes of the ASCR
DCTOOL-A3

DCTOOL-A3 is a documentation of Matlab routines developed for the design of decentralized control of large scale complex systems. The current beta version covers three areas as follows:\nReport 4.1 ...

Bakule, Lubomír; Papík, Martin; Rehák, Branislav
Ústav teorie informace a automatizace, 2016

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