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Validace deterministického jádra HAVAR-DET systému HARP a jeho aplikace v oblasti hodnocení radiologických následků nehod
Pecha, Petr; Pechová, E.
2013 - český
Validace deterministického jádra HAVAR-DET pro popis šíření radioaktivity životním prostředím. Ukázka aplikací pro různé typy scénářů úniku radioaktivity do atmosféry. Validation of deterministic kernel of the HAVAR-DET systém designed for description of the radioactivity propagation through the living environment. Illustration of applications for various scenarios of the discharges of radioactivity into the atmosphere.
Klíčová slova:
Radioactivity; Assessment; Impact; applications
Dokument je dostupný na externích webových stránkách.
Validace deterministického jádra HAVAR-DET systému HARP a jeho aplikace v oblasti hodnocení radiologických následků nehod
Validace deterministického jádra HAVAR-DET pro popis šíření radioaktivity životním prostředím. Ukázka aplikací pro různé typy scénářů úniku radioaktivity do atmosféry....
Convolution Model of Time-activity Curves in Blind Source Separation
Tichý, Ondřej; Šmídl, Václav
2013 - anglický
Availability of input and organ functions is a prerequisite for analysis of dynamic image sequences in scintigraphy and positron emission tomography (PET) via kinetic models. In PET, the input function can be directly measured by sampling the arterial blood. This invasive procedure can be substituted by extraction of the input function from the observed images. Standard procedure for the extraction is based on manual selection of a region of interest (ROI) which is user-dependent and inaccurate. The aim of our contribution is to demonstrate a new procedure for simultaneous estimation of the input and organ functions from the observed image sequence. We design a mathematical model that integrates all common assumption of the domain, including convolution of the input function and tissue-specific kernels. The input function as well as the kernel parameters are considered to be unknown. They are estimated from the observed images using the Variational Bayes method.
Klíčová slova:
dynamic medical imaging; compartment modeling; Convolution; blind source separation
Dokument je dostupný na externích webových stránkách.
Convolution Model of Time-activity Curves in Blind Source Separation
Availability of input and organ functions is a prerequisite for analysis of dynamic image sequences in scintigraphy and positron emission tomography (PET) via kinetic models. In PET, the input ...
Pole LED v matici 8x8
Kuneš, Michal; Blažek, Jan
2013 - český
Dokument popisuje návrh a zhotovení pole LED (svítivých diod) s trojúhelníkovou maticí LED se stranou o délce 5 cm. Jednotlivé LED s co nejnižší šírkou pásma a s co největší homogenitou vyzařovaného světla pokrývají co největší pásmo vlnových délek (viditelného) světla od 350 do 1000nm, v celkové velikosti 8 x 8 LED. Navržené zařízení je určeno k multispektrálnímu snímání uměleckých obrazů. The reserach report describes design and implementation issues of LED field with triangular matrix of diodes. LEDs with the narrowest bandwidth and with the largest homogeneity of emitted light cover the widest wavelength bandwidth overall (350 - 1000nm). The proposed equipment is dedicated to multispectral acquisition of paintings.
Klíčová slova:
LED matrix; multispectral data acquisition
Dokument je dostupný na externích webových stránkách.
Pole LED v matici 8x8
Dokument popisuje návrh a zhotovení pole LED (svítivých diod) s trojúhelníkovou maticí LED se stranou o délce 5 cm. Jednotlivé LED s co nejnižší šírkou pásma a s co největší homogenitou vyzařovaného ...
Rozvoj deterministické verze systému HARP a její pravděpodobnostní rozšíření
Pecha, Petr; Hofman, Radek; Pechová, E.
2013 - český
Popisuje se rozvoj environmentálního modelu HARP pro analýzu šíření radioaktivity životním prostředím při mimořádných únicích aktivity. Development of environmental code HARP for analysis of radioactivity propagetion through the living environment. Assessment of health consequences of accidental discharges of activity.
Klíčová slova:
Dispersion; Predictions; consequence; assessment
Dokument je dostupný na externích webových stránkách.
Rozvoj deterministické verze systému HARP a její pravděpodobnostní rozšíření
Popisuje se rozvoj environmentálního modelu HARP pro analýzu šíření radioaktivity životním prostředím při mimořádných únicích aktivity....
Fuel consumption optimization: Modication of optimality criterion in the case of speeding risk
Pavelková, Lenka
2013 - anglický
The report describes some experiments related to the project Ekodrive, TA ČR TA0103012, which concerns with fuel consumption optimisation under condition of keeping the recommended speed. During control, a speeding risk can occur if designed control leads to a vehicle speed that is higher than speed limit. This problem is solved by switching to an additional (non-optimal) regulator and/or by using a deterministic logic control block whenever a speed limit overrun is predicted. Here, an alternative approach is proposed which uses an original controller only but the optimality criterion is extended by one terms that penalises vehicle speed increments.
Klíčová slova:
fuel consumption optimization; speeding risk; LQG controller
Dokument je dostupný na externích webových stránkách.
Fuel consumption optimization: Modication of optimality criterion in the case of speeding risk
The report describes some experiments related to the project Ekodrive, TA ČR TA0103012, which concerns with fuel consumption optimisation under condition of keeping the recommended speed. During ...
Inflation and the Steeplechase Between Economic Activity Variables
Baxa, Jaromír; Plašil, M.; Vašíček, B.
2013 - anglický
A sharp increase in unemployment accompanied by a relatively muted response of inflation during the Great Recession added further doubts to the validity of the Phillips curve and the existence of a systemic relationship between economic activity and inflation. This paper aims to show to what extent the uncertainty about the choice of proper forcing variable contributes to the ambiguity of the evidence on the Phillips curve in the United States and other G7 countries. We use dynamic model averaging (Raftery et al., 2010), which marries the flexibility of the time-varying parameter framework with the possibility of model switching in each period. Our results show that inflation seems to respond to different measures of economic activity across time and space to a varying extent and no measure of economic activity clearly dominates in all countries or over the whole sample.
Klíčová slova:
dynamic model averaging; inflation dynamics; Phillips curve
Dokument je dostupný na externích webových stránkách.
Inflation and the Steeplechase Between Economic Activity Variables
A sharp increase in unemployment accompanied by a relatively muted response of inflation during the Great Recession added further doubts to the validity of the Phillips curve and the existence of a ...
Centralized Estimation of Adhesion Loss in Wheel-Rail System Using Variational Bayes and Variational Message Passing
Dedecius, Kamil
2013 - anglický
The report deals with centralized estimation of adhesion loss in system wheel-rail. Two variational methods are used for this purpose, namely the variational Bayes and the variational message passing.
Klíčová slova:
variational Bayes; variational message passing; estimation
Dokument je dostupný na externích webových stránkách.
Centralized Estimation of Adhesion Loss in Wheel-Rail System Using Variational Bayes and Variational Message Passing
The report deals with centralized estimation of adhesion loss in system wheel-rail. Two variational methods are used for this purpose, namely the variational Bayes and the variational message ...
Data assimilation methods used in the ASIM module
Šmídl, Václav; Hofman, Radek; Pecha, Petr
2013 - anglický
Comprehensive review of data assimilation methods for improvement of the model predictions of consequences of a radiation accident. The methods of the numerical optimization techniques and sequential Monte Carlo techniques are implemented. Applications in the field of consequence assessments are presented.
Klíčová slova:
Assimilation; Filtering; Predictions; Accident
Dokument je dostupný na externích webových stránkách.
Data assimilation methods used in the ASIM module
Comprehensive review of data assimilation methods for improvement of the model predictions of consequences of a radiation accident. The methods of the numerical optimization techniques and sequential ...
A Comparison of Adaptive Sampling and Interpolation of 2D BRDF Subspaces
Vávra, Radomír; Filip, Jiří; Somol, P.
2013 - anglický
This report comprises overview of interpolation and sampling methods of Bidirectional Reflectance Distribution Function (BRDF). We analyzed 2D BRDF subspaces of eleven materials. We compared performance of five interpolation methods, three different sampling patterns, and compared twelve adaptive sampling strategies. Finally, based on knowledge of entire data we estimated sub-optimal sampling patterns and as a reference compared them with other tested sampling approaches.
Klíčová slova:
BRDF; interpolation; sampling
Dokument je dostupný na externích webových stránkách.
A Comparison of Adaptive Sampling and Interpolation of 2D BRDF Subspaces
This report comprises overview of interpolation and sampling methods of Bidirectional Reflectance Distribution Function (BRDF). We analyzed 2D BRDF subspaces of eleven materials. We compared ...
A causal model of price and volume on market with a market maker
Šmíd, Martin; Kopa, M.
2012 - anglický
A model of a rational behaviour of a risk averse partially informed market maker solving multistage decision problem was proposed, implying an easily tractable and estimable stochastic model of high frequency trade and quote data process, which was subsequently successfully tested by means of data from US electronic markets.
Klíčová slova:
market maker; rationality; price and volume process
Dokument je dostupný na externích webových stránkách.
A causal model of price and volume on market with a market maker
A model of a rational behaviour of a risk averse partially informed market maker solving multistage decision problem was proposed, implying an easily tractable and estimable stochastic model of high ...
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