Number of found documents: 1471
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Risk-Sensitive Optimality in Markov Games
Sladký, Karel; Martínez Cortés, V. M.
2017 - English
The article is devoted to risk-sensitive optimality in Markov games. Attention is focused on Markov games evolving on communicating Markov chains with two-players with opposite aims. Considering risk-sensitive optimality criteria means that total reward generated by the game is evaluated by exponential utility function with a given risk-sensitive coefficient. In particular, the first player (resp. the secondplayer) tries to maximize (resp. minimize) the long-run risk sensitive average reward. Observe that if the second player is dummy, the problem is reduced to finding optimal policy of the Markov decision chain with the risk-sensitive optimality. Recall that for the risk sensitivity coefficient equal to zero we arrive at traditional optimality criteria. In this article, connections between risk-sensitive and risk-neutral Markov decisionchains and Markov games models are studied using discrepancy functions. Explicit formulae for bounds on the risk-sensitive average long-run reward are reported. Policy iteration algorithm for finding suboptimal policies of both players is suggested. The obtained results are illustrated on numerical example. Keywords: two-person Markov games; communicating Markov chains; risk-sensitive optimality; dynamic programming Fulltext is available at external website.
Risk-Sensitive Optimality in Markov Games

The article is devoted to risk-sensitive optimality in Markov games. Attention is focused on Markov games evolving on communicating Markov chains with two-players with opposite aims. Considering ...

Sladký, Karel; Martínez Cortés, V. M.
Ústav teorie informace a automatizace, 2017

Various Approaches to Szroeter’s Test for Regression Quantiles
Kalina, Jan; Peštová, B.
2017 - English
Regression quantiles represent an important tool for regression analysis popular in econometric applications, for example for the task of detecting heteroscedasticity in the data. Nevertheless, they need to be accompanied by diagnostic tools for verifying their assumptions. The paper is devoted to heteroscedasticity testing for regression quantiles, while their most important special case is commonly denoted as the regression median. Szroeter’s test, which is one of available heteroscedasticity tests for the least squares, is modified here for the regression median in three different ways: (1) asymptotic test based on the asymptotic representation for regression quantiles, (2) permutation test based on residuals, and (3) exact approximate test, which has a permutation character and represents an approximation to an exact test. All three approaches can be computed in a straightforward way and their principles can be extended also to other heteroscedasticity tests. The theoretical results are expected to be extended to other regression quantiles and mainly to multivariate quantiles. Keywords: Heteroscedasticity; Regression median; Diagnostic tools; Asymptotics Fulltext is available at external website.
Various Approaches to Szroeter’s Test for Regression Quantiles

Regression quantiles represent an important tool for regression analysis popular in econometric applications, for example for the task of detecting heteroscedasticity in the data. Nevertheless, they ...

Kalina, Jan; Peštová, B.
Ústav teorie informace a automatizace, 2017

Flexible Moment Invariant Bases for 2D Scalar and Vector Fields
Bujack, R.; Flusser, Jan
2017 - English
Complex moments have been successfully applied to pattern detection tasks in two-dimensional real, complex, and vector valued functions. In this paper, we review the different bases of rotational moment invariants based on the generator approach with complex monomials. We analyze their properties with respect to independence, completeness, and existence and\npresent superior bases that are optimal with respect to all three criteria for both scalar and vector fields. Keywords: Pattern detection; moment invariants; scalar fields; vector fields; flow fields; generator; basis; complex; monomial Fulltext is available at external website.
Flexible Moment Invariant Bases for 2D Scalar and Vector Fields

Complex moments have been successfully applied to pattern detection tasks in two-dimensional real, complex, and vector valued functions. In this paper, we review the different bases of rotational ...

Bujack, R.; Flusser, Jan
Ústav teorie informace a automatizace, 2017

Avoiding overfitting of models: an application to research data on the Internet videos
Jiroušek, Radim; Krejčová, I.
2017 - English
The problem of overfitting is studied from the perspective of information theory. In this context, data-based model learning can be viewed as a transformation process, a process transforming the information contained in data into the information represented by a model. The overfitting of a model often occurs when one considers an unnecessarily complex model, which usually means that the considered model contains more information than the original data. Thus, using one of the basic laws of information theory saying that any transformation cannot increase the amount of information, we get the basic restriction laid on models constructed from data: A model is acceptable if it does not contain more information than the input data file. Keywords: data-based learning; probabilistic models; information theory; MDL principle; lossless encoding Fulltext is available at external website.
Avoiding overfitting of models: an application to research data on the Internet videos

The problem of overfitting is studied from the perspective of information theory. In this context, data-based model learning can be viewed as a transformation process, a process transforming the ...

Jiroušek, Radim; Krejčová, I.
Ústav teorie informace a automatizace, 2017

METODIKA HODNOCENÍ PORUCH HLASU Z VIDEOKYMOGRAFICKÝCH ZÁZNAMŮ
Vydrová, J.; Švec, J. G.; Zitová, Barbara; Novozámský, Adam; Zita, Aleš; Šorel, Michal
2017 - Czech
Cílem metodiky „Hodnocení poruch hlasu z videokymografických záznamů“ je podat ucelený soubor\ninformací o nové diagnostické metodě vyšetřování funkčních i organických poruch hlasu – videokymografii (VKG). Metodika je určena pro lékaře otorinolaryngology a foniatry, kteří poruchy\nhlasu diagnostikují a léčí. Metodika bude rovněž sloužit jako studijní materiál pro školitele i školence\ncertifikovaného kurzu „Videokymografie v lékařské praxi“. Diagnostická metoda sestává z techniky vyšetření pacienta a z vyhodnocení výsledku vyšetření. Výsledkem vyšetření je vibrační vzorec hlasivek. Tento vzorec je automaticky vyhodnocen softwarem, který byl k VKG diagnostice vytvořen. The aim of the methodology „Evaluating voice disorders from videkymographic data“ is to provide a comprehensive information on a new diagnostic method for diagnosis of functional and organic disorders of the voice - videokymography (VKG). The methodology is intended for otorinolaryngology and phoniatry specialists. The methodology will also serve as a study material for both trainers and trainees of the certified course „Videokymography in Medical Practice“. The diagnostic method consists of a patient examination technique and of an evaluation of the examination results. Thie data are automatically evaluated by software created to support the VKG diagnostics. Keywords: vocal fold analysis; videokymography; computer aided diagnosis Available at various institutes of the ASCR
METODIKA HODNOCENÍ PORUCH HLASU Z VIDEOKYMOGRAFICKÝCH ZÁZNAMŮ

Cílem metodiky „Hodnocení poruch hlasu z videokymografických záznamů“ je podat ucelený soubor\ninformací o nové diagnostické metodě vyšetřování funkčních i organických poruch hlasu – videokymografii ...

Vydrová, J.; Švec, J. G.; Zitová, Barbara; Novozámský, Adam; Zita, Aleš; Šorel, Michal
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

Exact Inference In Robust Econometrics under Heteroscedasticity
Kalina, Jan; Peštová, B.
2017 - English
The paper is devoted to the least weighted squares estimator, which is one of highly robust estimators for the linear regression model. Novel permutation tests of heteroscedasticity are proposed. Also the asymptotic behavior of the permutation test statistics of the Goldfeld-Quandt and Breusch-Pagan tests is investigated. A numerical experiment on real economic data is presented, which also shows how to perform a robust prediction model under heteroscedasticity. Theoretical results may be simply extended to the context of multivariate quantiles Keywords: heteroscedasticity; robust statistics; regression; diagnostic tools; economic data Fulltext is available at external website.
Exact Inference In Robust Econometrics under Heteroscedasticity

The paper is devoted to the least weighted squares estimator, which is one of highly robust estimators for the linear regression model. Novel permutation tests of heteroscedasticity are proposed. Also ...

Kalina, Jan; Peštová, B.
Ústav teorie informace a automatizace, 2017

Hidden Auto-Conflict in the Theory of Belief Functions
Daniel, M.; Kratochvíl, Václav
2017 - English
Hidden conflicts of belief functions in some cases where the sum of all multiples of conflicting belief masses being equal to zero were observed. Relationships of hidden conflicts and auto-conflicts of belief functions are pointed out. We are focused on hidden auto-conflicts here - on hidden conflicts appearing when three or more numerically same belief functions are combined. Hidden auto-conflict is a kind of internal conflict. Degrees of hidden auto-conflicts and full non-conflictness are defined and analysed. Finally, computational issues of hidden auto-conflicts and non-conflictness are presented. Keywords: Belief functions; Dempster-Shafer theory; Uncertainty; Conflicting belief masses; Internal conflict; Auto-conflict; Hidden-conflict Fulltext is available at external website.
Hidden Auto-Conflict in the Theory of Belief Functions

Hidden conflicts of belief functions in some cases where the sum of all multiples of conflicting belief masses being equal to zero were observed. Relationships of hidden conflicts and auto-conflicts ...

Daniel, M.; Kratochvíl, Václav
Ústav teorie informace a automatizace, 2017

Parametric Optimization and Related Topics XI
Červinka, Michal; Kratochvíl, Václav
2017 - English
Parametric Optimization and Related Topics XI was a conference dedicate to Jiří Outrata on the occasion of his seventieth birthday. The programme for 86 participants from 21 countries was composed of five invited and 77 contributed talks, held in 22 sessions. Keywords: Parametric Optimization; Optimization; Equilibrium Fulltext is available at external website.
Parametric Optimization and Related Topics XI

Parametric Optimization and Related Topics XI was a conference dedicate to Jiří Outrata on the occasion of his seventieth birthday. The programme for 86 participants from 21 countries was composed of ...

Červinka, Michal; Kratochvíl, Václav
Ústav teorie informace a automatizace, 2017

K otázkám hodnocení radiologických důsledků mimořádných úniků radionuklidů ze skladů vyhořelého jaderného paliva
Pecha, Petr
2017 - Czech
Zkoumána oblast postulovaných nehod ve skladech (bazénech a pak úložištích) vyhořelého paliva. Zde se předpokládá, že krátkodobé nebezpečné nuklidy se již rozpadly na zanedbatelné úrovně a počáteční inventář vyhořelého paliva klesá s časem uskladnění (řádově roky). Na významu nabývají nuklidy s dlouhým poločasem rozpadu. Uvedena srovnávací analýza výsledků kódu HARP s evropským kódem COSYMA. The investigation of potential accidental releases o radionuclides from spent fuel repositories is resumed. Short-term life of radionuclides are assumed to be subsided and decisive role in radiological impact assessment have lradionuclides with long half-lives. Further decrease of radioactivity is then very slow. Comparable analysis of the results acquired by HARP code developed in ÚTIA with results of European code COSYMA is presented. Keywords: Spent nuclear fuel; fuel repository; release source terms Fulltext is available at external website.
K otázkám hodnocení radiologických důsledků mimořádných úniků radionuklidů ze skladů vyhořelého jaderného paliva

Zkoumána oblast postulovaných nehod ve skladech (bazénech a pak úložištích) vyhořelého paliva. Zde se předpokládá, že krátkodobé nebezpečné nuklidy se již rozpadly na zanedbatelné úrovně a počáteční ...

Pecha, Petr
Ústav teorie informace a automatizace, 2017

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