Performance Analysis of Extended EFICA Algorithm
Koldovský, Zbyněk; Málek, J.; Tichavský, Petr; Yannick, D.; Shahram, H.
2007 - English This paper supports the document "Extension of EFICA Algorithm for Blind Separation of Piecewise Stationary Non Gaussian Sources." Tento clanek je doplnkem k clanku "Extension of EFICA Algorithm for Blind Separation of Piecewise Stationary Non Gaussian Sources." Keywords: Cramer-Rao Lower Bound; Independent Component Analysis; Blind Source Separation; EFICA Algorithm Available at various institutes of the ASCR Performance Analysis of Extended EFICA Algorithm

This paper supports the document "Extension of EFICA Algorithm for Blind Separation of Piecewise Stationary Non Gaussian Sources."...

Koldovský, Zbyněk; Málek, J.; Tichavský, Petr; Yannick, D.; Shahram, H.
Ústav teorie informace a automatizace, 2007

Decision Making with Imperfect Knowledge Accumulation
Kárný, Miroslav
2007 - English Formal basis of Bayesian decision making with non-expanding knowledge accumulation is proposed. Je navržen formální základ bayesovského rozhodování při nenarůstajícím rozsahu znalostí Keywords: Bayesian decision making; knowledge accumulation Available at various institutes of the ASCR Decision Making with Imperfect Knowledge Accumulation

Formal basis of Bayesian decision making with non-expanding knowledge accumulation is proposed.

Kárný, Miroslav
Ústav teorie informace a automatizace, 2007

An Adaptive Feed-Forward Control
Kárný, Miroslav
2007 - English Feed-forward controllers are important in a range of control problems. Their importance is obvious in tasks in which potential of feedback control is limited, for instance, in systems with long transportation delays. Formally, their design can be approached by a standard methodology of optimal stochastic control. It can be consistently performed by combining Bayesian learning and dynamic programming. This formal solution can, however, rarely be converted into a computationally feasible algorithms. Thus, various approximations are searched for. The current report deals with a specific type of approximation based on a projection of optimal /emph{anticipating} control strategy to a non-anticipating one. This approximation way suits to the feed-forward control in which the selected system inputs influence the state of the controller but not the system-related data used in the feed-forward loop. V práci je popsán speciální návrh adaptivní dopředné vazby založený na neanticipativní aproximaci optimální anticipativní strategie. Keywords: adaptive feed=forward control; approximation Available at various institutes of the ASCR An Adaptive Feed-Forward Control

Feed-forward controllers are important in a range of control problems. Their importance is obvious in tasks in which potential of feedback control is limited, for instance, in systems with long ...

Kárný, Miroslav
Ústav teorie informace a automatizace, 2007

Image Segmentation Based on Local Noise Variance
Saic, Stanislav; Mahdian, Babak
2007 - English New segmentation method detecting changes in noise variance is introduced. Several examples are shown to demonstrate the method’s output. Je předvedena nová metoda pro detekci zmen variance sumu v digitálním obraze. Na řadě příkladů jsoou uvedeny výstupy metody. Keywords: Digital image; Segmentation; Noise; Tampering Available at various institutes of the ASCR Image Segmentation Based on Local Noise Variance

New segmentation method detecting changes in noise variance is introduced. Several examples are shown to demonstrate the method’s output....

Saic, Stanislav; Mahdian, Babak
Ústav teorie informace a automatizace, 2007

Spectral gap for zero processes on graphs
Fajfrová, Lucie
2007 - English The paper presents a method how the problem of finding a lower bound on the spectral gap for a zero range process on a connected graph could be transformed into the problem of finding a lower bound on spectral gap of a simple random walk on the graph. V clanku se ukazuje, jak lze ulohu nalezeni odhadu spektralni mezery pro Zero-range proces na grafu prevest na ulohu hledani spektralni mezery nahodne prochazky na grafu Keywords: particle systems; zero range dynamics; spectral gap Available at various institutes of the ASCR Spectral gap for zero processes on graphs

The paper presents a method how the problem of finding a lower bound on the spectral gap for a zero range process on a connected graph could be transformed into the problem of finding a lower ...

Fajfrová, Lucie
Ústav teorie informace a automatizace, 2007

Convexity and dependence in chance-constrained programming
Houda, Michal
2007 - English Keywords: stochastich programmnig; weak dependence; stability Available at various institutes of the ASCR Convexity and dependence in chance-constrained programming

Houda, Michal
Ústav teorie informace a automatizace, 2007

Empirical Estimates via Stability in Stochastic Programming
Kaňková, Vlasta
2007 - English It is known that optimization problems depending on a probability measure correspond to many applications. It is also known that these problems belong mostly to a class of nonlinear optimization problems and, moreover, that very often an ``underlying" probability measure is not completely known. The aim of the research report is to deal with the case when an empirical measure substitutes the theoretical one. In particular, the aim is to generalize reults dealing with convergence rate in the case of empirical esrimates. The introduced results are based on the stability results corresponding to the Wasserstein metric. A relationship berween tails of one-dimensional marginal distribution functions and exponentional rate of convergence are introduced. The corresponding results are focus mainly on ``classical" type of problems corresponding to the cases with penalty and recourse. However, an integer simple recourse case and some special risk funkcionals are discussed also. Keywords: Stochastic programming; stability; Wasserstein metric; empirical estimates; convergence rate; problems with penalty and recourse; integer simple recourse case; resk funkcionals Available at various institutes of the ASCR Empirical Estimates via Stability in Stochastic Programming

It is known that optimization problems depending on a probability measure correspond to many applications. It is also known that these problems belong mostly to a class of nonlinear optimization ...

Kaňková, Vlasta
Ústav teorie informace a automatizace, 2007

Predictive Monitoring of Radiation Situation
Nedoma, Petr; Pecha, Petr; Kuča, P.
2007 - English Report describes proposition how predictive monitoring of radiological situation from measurements of Early Warning Network of the Czech Republic could be realised. The presented results indicate that mixtures of auto-regresive models improve predictions comparing to plain auto-regresion. Zpráva popisuje návrh prediktivního monitorování radiační situace z měření přicházejících z radiační sítě včasného zjištění ČR. Uvedené výsledky dokládají, že použité směsi auto-regresivních modelů zlepšují predikční schopnost ve srovnání s jednoduchou auto-regresí. Keywords: Monitoring; accidents; warning; protection Available at various institutes of the ASCR Predictive Monitoring of Radiation Situation

Report describes proposition how predictive monitoring of radiological situation from measurements of Early Warning Network of the Czech Republic could be realised. The presented results indicate that ...

Nedoma, Petr; Pecha, Petr; Kuča, P.
Ústav teorie informace a automatizace, 2007

Model-Based Visual Inspection
Haindl, Michal; Pudil, Pavel; Somol, Petr
2007 - English Model-Based Visual Inspection Obrazová inspekce založená na vícerozměrných statistických modelech Keywords: visual inspection; multidimensional models Available at various institutes of the ASCR Model-Based Visual Inspection

Model-Based Visual Inspection

Haindl, Michal; Pudil, Pavel; Somol, Petr
Ústav teorie informace a automatizace, 2007

Asymptotic Analysis of Bias of FastICA-based Algorithms in Presence of Additive Noise
Koldovský, Zbyněk; Tichavský, Petr
2007 - English The idea that common blind techniques based on Independent Component Analysis (ICA) behave in noisy environment like a biased MMSE separator (sometimes called Maximum Ratio Combiner (MRC)) was introduced in our recent work [3]. In this paper, we put this in more precise terms by doing an analysis of the bias of approaches that are based on known ICA algorithm FastICA. We show that the one-unit approach is the best MMSE estimator in terms of the bias. Myšlenka, že se většina metod pro slepou separaci signálu používajících analýzu nezávislých komponent chová jako vychýlený MMSE estimátor byla použita v naší nedávné práci [3]. Zde tuto myšlenku konkrétizujeme tím, že analyzujeme odchylku algoritmů, které jsou odvozené ze známého algoritmu FastICA. Je prokázáno, že varianta one-unit je z hlediska vychýlení nejlepší MMSE estimátor. Keywords: Independent Component Analysis Available at various institutes of the ASCR Asymptotic Analysis of Bias of FastICA-based Algorithms in Presence of Additive Noise

The idea that common blind techniques based on Independent Component Analysis (ICA) behave in noisy environment like a biased MMSE separator (sometimes called Maximum Ratio Combiner (MRC)) was ...

Koldovský, Zbyněk; Tichavský, Petr
Ústav teorie informace a automatizace, 2007