No (2512)
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2512
FPGA Module for Fast Waveform Generation and Synchronous Data Acquisition
Eliáš, Josef
Czech
This article deals with system for fast waveform generation and synchronous data acquisition. System is used for evaluation of optical sensors by sweep through narrow band light source. The DAQ system use dual core ARM processor with build in FPGA array. We can achieve direct sharing memory between ARM core and AD/DA periphery through SoC architecture. Then we can optimally distributed core usage between processors and peripherals.
Keywords:
waveform; data aquisition; FPGA; SoC; ARM; AXI
Available in a digital repository NRGL
FPGA Module for Fast Waveform Generation and Synchronous Data Acquisition
This article deals with system for fast waveform generation and synchronous data acquisition. System is used for evaluation of optical sensors by sweep through narrow band light source. The DAQ system ...
Simulation of Static Grant Allocation in NG-PON2 Networks
Cymorek, Patrik
Czech
This paper deals with issue of static grant allocation. The main goal of this paper is to present functionality of NG-PON2 networks and describe static form of grant allocation. The first part of the paper is focused on development of passive optical networks. Subsequently Next-Generation Passive Optical Networks and simulation in OPNET modeler are described. In modeler own designs of node and process models are used.
Keywords:
NG-PON2; OPNET Modeler; Static allocation
Available in a digital repository NRGL
Simulation of Static Grant Allocation in NG-PON2 Networks
This paper deals with issue of static grant allocation. The main goal of this paper is to present functionality of NG-PON2 networks and describe static form of grant allocation. The first part of the ...
60 GHz Time Domain Channel Sounder
Vychodil, Josef
English
This paper describes a time domain channel sounder based on pseudorandom binary sequences. The channel sounder system consists of several off-the-shelf laboratory instruments connected together and controlled from PC. Frequency band of interest is the unlicensed millimeter wave band (MMW), 57–64 GHz. The system’s architecture and its parameters are presented and discussed. Crucial feature of the proposed system is fast measurement speed enabling measurements of real scenarios with moving objects.
Keywords:
MMW; millimeter wave band; channel sounding
Available in a digital repository NRGL
60 GHz Time Domain Channel Sounder
This paper describes a time domain channel sounder based on pseudorandom binary sequences. The channel sounder system consists of several off-the-shelf laboratory instruments connected together and ...
Directive Dielectric Resonator Antenna
Mrnka, Michal
English
Relatively directive, single element, linearly polarized, dielectric resonator antenna for the ISM band applications (5.8 GHz) is presented in the paper. Its operation is based on the excitation of higher order modes inside a cylindrical dielectric resonator antenna of low relative permittivity material (εr= 6.15) fed by an aperture coupled microstrip line. The behavior of the mode properties inside the resonator is studied and geometry providing maximum gain is determined. Measurement results are given and compared with simulations results obtained in CST Microwave Studio in order to confirm the correct operation of the antenna.
Keywords:
dielectric resonator antennas; directive antennas; dielectrics; higher order modes
Available in a digital repository NRGL
Directive Dielectric Resonator Antenna
Relatively directive, single element, linearly polarized, dielectric resonator antenna for the ISM band applications (5.8 GHz) is presented in the paper. Its operation is based on the excitation of ...
The Description of the Program for Factorization of Large Numbers
Levek, Vladimír
English
The article describes the algorithm for factorization of large numbers. If there is the result of the product of two prime numbers, then the program can find the factors. The first part of the article generally introduces the problem of factoring large integers and its impact in the field of the cryptography. The next part describes the algorithm and the program for calculation. At the end of the article there is a summary of the possibilities of the program.
Keywords:
Cryptography; Factorization; RSA; Prime number; Large Numbers; Order of magnitude
Available in a digital repository NRGL
The Description of the Program for Factorization of Large Numbers
The article describes the algorithm for factorization of large numbers. If there is the result of the product of two prime numbers, then the program can find the factors. The first part of the article ...
Distributed Framework for Testing Machine Learning Methods
Klusáček, Jan
English
When designing new Machine learning (ML) methods, solid testing is very important part of process. This article describes a framework that was created for automated testing and comparison of different ML methods. This framework allows to automate most of tedious and recurrent tasks related to comparison and testing of new methods. It consists of two parts. First part is intended for work with results of ML methods. It allows to compare results of different methods with different settings. It allows to create tables and graph from these results and it also perform statistical tests on these results. It is often necessary to perform considerable number of test runs on different datasets and with different settings for purpose of comparison and statistical test. For these reasons it is advisable to automate these tasks as much as possible. Automation of these tasks is purpose of second part of this framework. It allows to divide, plan and execute tasks on remote machines. Whole framework is written using Python and Django framework allowing to easily extend customize it for particular task.
Keywords:
Machine learning; Python; Parallelization; Web interface
Available in a digital repository NRGL
Distributed Framework for Testing Machine Learning Methods
When designing new Machine learning (ML) methods, solid testing is very important part of process. This article describes a framework that was created for automated testing and comparison of different ...
Experimental Analysis of Low Voltage Arc Between Carbon Electrodes with Unknown Cores
Šimek, David
English
The paper is focused on an electric arc spectroscopy diagnostics related to electric low voltage apparatuses. Measurement of radiation spectra of the electric arc burning between carbon electrodes with unknown cores is presented. Measured radiation spectrum has a lot of suitable atomic spectra lines for comparison purposes. The problems connected with the measurements are discussed. The main part of the paper deals with a prediction of composition of the measured arc plasma. Atomic lines database of National Institute of Standards and Technology was used as a spectral data source for the calculations.
Keywords:
switching arc; arc plasma composition; atomic emission spectroscopy
Available in a digital repository NRGL
Experimental Analysis of Low Voltage Arc Between Carbon Electrodes with Unknown Cores
The paper is focused on an electric arc spectroscopy diagnostics related to electric low voltage apparatuses. Measurement of radiation spectra of the electric arc burning between carbon electrodes ...
The Eddy Current Losses of High-Speed Solid Rotor Induction Machine as Function of the Radial Air-Gap Lenght
Bárta, Jan
English
This paper introduces that the appropriately selected air-gap width have major impact in terms of efficiency for high-speed induction machines. Machine of interest is high-speed solid rotor cage induction machine intended for helium turbo-circulator. Proposed study is done from electromagnetic and thermal point of view. Presented results can be used as a guideline for air-gap length selection for others high-speed solid rotor induction machines.
Keywords:
AC machine; High-speed drive; Induction motors; Finite element analysis
Available in a digital repository NRGL
The Eddy Current Losses of High-Speed Solid Rotor Induction Machine as Function of the Radial Air-Gap Lenght
This paper introduces that the appropriately selected air-gap width have major impact in terms of efficiency for high-speed induction machines. Machine of interest is high-speed solid rotor cage ...
The Process of Cross Section Generation for Reactor Core Simulations
Novotný, Filip
English
Reactor core safety analysis is a complex problem and needs processed input data and cannot be performed without it. For this purpose several nuclear programs exist. A suitable nuclear programs as well as the motivation of the generation are given in this study. This article also summarizes methods and steps needed for the homogenized cross-section generation and provides basic instruction and settings needed to provide these simulations and accomplished this research and gives basic instruction and information about problems and programs which can occur during the cross-section generation. Finally, there is proposed cross-sections structure suitable for safety analysis with reactor core simulator PARCS.
Keywords:
SCALE; lattice physics models; cross-sections; GENPMAXS; PARCS
Available in a digital repository NRGL
The Process of Cross Section Generation for Reactor Core Simulations
Reactor core safety analysis is a complex problem and needs processed input data and cannot be performed without it. For this purpose several nuclear programs exist. A suitable nuclear programs as ...
Acoustic Analysis of Sentences Complicated for Articulation in Patients with Parkinson's Disease
Kiska, Tomáš
English
This paper deals with acoustic analysis of hypokinetic dysarthria. Hypokinetic dysarthria is a speech motor dysfunction that is present in approximately 90% of patients with Parkinson’s disease (PD). The work is mainly focused on parameterization techniques that can be used to diagnose or monitor this disease as well as estimate its progress. Acoustic analysis can be used to estimate a grade of hypokinetic dysarthria in fields of phonation, articulation, prosody and speech fluency. Regarding the parameterization, new features based on RASTA method were proposed. The analysis is based on parametrization of sentences complicated for articulation. Experimental dataset consists of 101 PD patients with different disease progress and 53 healthy controls. For the purpose of feature selection we employed mRMR (minimum Redundancy Maximum Relevance) method.
Keywords:
Parkinson’s disease; hypokinetic dysarthria; speech parameterization; speech signal processing; objective analysis; diagnosis; monitoring; progress estimation
Available in a digital repository NRGL
Acoustic Analysis of Sentences Complicated for Articulation in Patients with Parkinson's Disease
This paper deals with acoustic analysis of hypokinetic dysarthria. Hypokinetic dysarthria is a speech motor dysfunction that is present in approximately 90% of patients with Parkinson’s disease (PD). ...
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