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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 ...
What the Data Say about the Effects of Fiscal Policy in the Czech Republic?
Baxa, Jaromír
2013 - anglický
In this paper, we provide the estimates of the fiscal multiplier in the Czech economy, based on the methodology of the fiscal VAR. The basic idea, adding fiscal variables into the macroeconomic VAR model, follows Blanchard and Perotti (2002). For estimation of our model, we utilize the dataset with quarterly data on a sample from the first quarter of 1998 to the second quarter of 2009. Our main results are as follows. Firstly, government expenditures have a positive and significant impact on the GDP. By contrast, a response of GDP on a shock to government revenues is slightly negative and in most specifications not significant. Secondly, these results are robust to various sensitivity checks. Consequently, the restoration of sustainable fiscal policy should focus rather on the revenues side than in the government expenditures, since a significant cut in government spending would probably have slowed down economic growth. Finally, we should note, that uncertainty connected with our results is large, namely in comparison with existing studies on the effects of monetary policy.
Klíčová slova:
fiscal policy; vector autoregression
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
What the Data Say about the Effects of Fiscal Policy in the Czech Republic?
In this paper, we provide the estimates of the fiscal multiplier in the Czech economy, based on the methodology of the fiscal VAR. The basic idea, adding fiscal variables into the macroeconomic VAR ...
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 ...
DCTOOL
Bakule, Lubomír; Papík, Martin; Rehák, Branislav
2013 - anglický
DCTOOL is a documentation of Matlab routines developed for the design of decentalized control of large scale complex systems.
Klíčová slova:
decentralized control; networked control systems; large scale complex systems
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
DCTOOL
DCTOOL is a documentation of Matlab routines developed for the design of decentalized control of large scale complex systems.
Modul pro převod vozidlových signálů na standard PS2
Plíhal, Jiří
2013 - český
Předmětem výzkumné úlohy je HW návrh a vytvoření modulu umožňujícího převod vozidlových signálů (programovatelné pole tlačítek, multifunkční volant Barrelkeys, multifunkční ovládací tlačítka) na standard PS2. Jedná se o ucelený návrh dekodéru včetně vytvoření funkčního vzorku. Technické řešení zahrnuje úlohy: maticové připojení mikrospínačů, připojení ovládacích prvků multifunkčního volantu „Barrelkeys“ pomocí datového přenosu Telenostra, integrace řídící jednotky klávesnicových prvků. The subject of the research task is aimed to proposal and development module for transmission vehicles signals (smart field of buttons, multifunction steering wheel Barrelkeys, multifunction control of buttons) to standard PS2. The whole proposal includes development functional sample of decoder. Technical solution comprises research tasks: interface for matrix micro switch, interface for control elements of multifunction steering wheel "Barelkeys" by means of data transmission Telenostra and integration keyboard control unit.
Klíčová slova:
Human-Machine-Interface; Control Systems; Warning and Assistant Systems; Signal Processing
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Modul pro převod vozidlových signálů na standard PS2
Předmětem výzkumné úlohy je HW návrh a vytvoření modulu umožňujícího převod vozidlových signálů (programovatelné pole tlačítek, multifunkční volant Barrelkeys, multifunkční ovládací tlačítka) na ...
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 ...
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