No (1173)
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1173
Luminous Intensity Distribution Curve Effect on Luminaire Placement
Bayer, Rudolf; Brejcha, Michal
English
The paper discusses a way to deploy a given number of point light sources in the interior to provide required illuminance levels and uniformity of the working plane by using a genetic algorithm. Furthermore a genetic algorithm has been used to generate a proper luminous intensity distribution curve of multiple luminaires to meet the given criteria for the reference plane of the model room for predefined luminaire positions.
Keywords:
genetic algorithm; luminaire; luminous intensity distribution curve
Available in a digital repository NRGL
Luminous Intensity Distribution Curve Effect on Luminaire Placement
The paper discusses a way to deploy a given number of point light sources in the interior to provide required illuminance levels and uniformity of the working plane by using a genetic algorithm. ...
Simple artifical life framework
Klusáček, J.
English
Artificial life (AL) is a field of study dealing with computer models simulating life and its evolution. This article describes a simple framework created to work with an artificial life. Created framework works with simulation of behavior of single cell organism. In addition, it also simulates basic physics. Results of simulations are accessible through a web interface which allows observing the environment and details of each organism. Simple demo of realised program is aviable at address: http://klusacek.tk/~honza/sim/view.php?sim=sim.
Keywords:
Artificial life; Python; Grammatical evolution; Web interface
Available in a digital repository NRGL
Simple artifical life framework
Artificial life (AL) is a field of study dealing with computer models simulating life and its evolution. This article describes a simple framework created to work with an artificial life. Created ...
Registration of Contrast-Enhanced Ultrasound Sequences
Šikner, T.
English
The registration of contrast-enhanced ultrasound (CEUS) image sequences is necessary for correct perfusion analysis. Methods developed for CEUS images have to overcome the low signal to noise ratio, speckle noise and pixel intensity changes given by the application of ultrasound contrast agents. A method presented in this paper utilizes intensity-based algorithm.
Keywords:
Contrast-enhanced ultrasound image; image registration
Available in a digital repository NRGL
Registration of Contrast-Enhanced Ultrasound Sequences
The registration of contrast-enhanced ultrasound (CEUS) image sequences is necessary for correct perfusion analysis. Methods developed for CEUS images have to overcome the low signal to noise ratio, ...
Encryption of Messages and Images Using Compressed Sensing
Daňková, M.
English
The article deals with compressed sensing used to encrypt data. It allows performing signal capturing, its compression and encryption at the same time. The measurement matrix is generated using a secret key and is exploited for encryption. The article shows an example of its utilization at text and image message, moreover the Arnold transform is used in colour images for increasing security.
Keywords:
compressed sensing; sparsity; cryptography; encryption; Arnold transform
Available in a digital repository NRGL
Encryption of Messages and Images Using Compressed Sensing
The article deals with compressed sensing used to encrypt data. It allows performing signal capturing, its compression and encryption at the same time. The measurement matrix is generated using a ...
Tungsten wire surface cleaning using electropolishing process
Jurčík, M.
English
This article deals with the preparation of tungsten wires surface for electrochemical etching process via electropolishing process. Cleaning of the wire surface is very important for obtaining field emission cold cathodes with sharp tips and low contamination on its surface which are made from these tungsten wires. There are many ways to clean wire surface such as heating it in a ultra vacuum, using solutions and acids, mechanical cleaning etc. Each of these methods has advantages and disadvantages and due to electropolishing process quickness this method was selected for futher usage.
Keywords:
electropolishing; electrochemical cleaning; field emission cold cathode; tungsten
Available in a digital repository NRGL
Tungsten wire surface cleaning using electropolishing process
This article deals with the preparation of tungsten wires surface for electrochemical etching process via electropolishing process. Cleaning of the wire surface is very important for obtaining field ...
Influence of phase optic sensor to the DWDM network
Čučka, M.
English
This article deals with influence of phase optic sensor to the DWDM transmission. In DWDM network we use four lasers sources for data transmission on one optical fiber. Next one DFB laser is used for phase optical sensor on the same optical fiber. This article is focused on influence of power DFB laser to the DWDM network. We changed the power of the DFB laser from-2 dBm to 35 dBm and watching the bit error rate and eye of the decision of the DWDM system. This model is simulated in RSoft Optsim.
Keywords:
WDM; DWDM; Optical fiber; Optical sensor; Phase OTDR; Optsim
Available in a digital repository NRGL
Influence of phase optic sensor to the DWDM network
This article deals with influence of phase optic sensor to the DWDM transmission. In DWDM network we use four lasers sources for data transmission on one optical fiber. Next one DFB laser is used for ...
Reliability and availability calculation propos efor the educational laboratory
Oujezský, V.; Novotný, B.
English
The basic task was to define the reliability of network equipment in the Laboratory of Transport Networks which is a part of “Sensor, Information and Communication Systems” research center (SIX). The whole educational process in the laboratory depends on the reliability of network equipment and our intention is to propose a method to define availability and reliability of used network equipment. It also serves the purpose of effective and predictable equipment renewal. This article describes mentioned method.
Keywords:
availability; equipment; educational process; laboratory; reliability
Available in a digital repository NRGL
Reliability and availability calculation propos efor the educational laboratory
The basic task was to define the reliability of network equipment in the Laboratory of Transport Networks which is a part of “Sensor, Information and Communication Systems” research center (SIX). The ...
Measurement of Magnetic Material
Bulín, T.
English
This article deals with a problem of measuring of magnetic materials, especially a punched laminations, which are used in construction of electric machines. It is very complicated to reach precise value of magnetic parameters, when there are used different methods. In this paper, there are compared values from manufacturer (Epstein frame) and alternative values obtained during the measurement on own sample (in shape of toroid). Magnetic properties of material can be changed relatively easy so it is appropriate to measure up worked material.
Keywords:
Magnetic measurement; losses; RemaGRAPH; RemaCOMP
Available in a digital repository NRGL
Measurement of Magnetic Material
This article deals with a problem of measuring of magnetic materials, especially a punched laminations, which are used in construction of electric machines. It is very complicated to reach precise ...
Analysis of High Speed Squirrel Cage Induction Motor With Influence of Riveting
Klíma, J.
English
This paper deals with analyzing of high speed squirrel cage induction motor and the influence of riveting stator stack. The model of high speed induction motor was made in ANSYS Maxwell software in accordance with provided design documentation. Test bench was used to experimentally verify the results. The difference between measurement and simulation are explored. Distribution of the losses and its individual portion are discussed at the end. Stator sheets are riveted and influence of rivets will be subject of the interest.
Keywords:
high-speed induction motor; test bench; finite element method; riveting
Available in a digital repository NRGL
Analysis of High Speed Squirrel Cage Induction Motor With Influence of Riveting
This paper deals with analyzing of high speed squirrel cage induction motor and the influence of riveting stator stack. The model of high speed induction motor was made in ANSYS Maxwell software in ...
Control of the electric wheelchair using EEG classification
Malý, L.
English
Electric wheelchairs are some of the most important devices to assist physically handicapped persons. This paper presents the concept of brain controlled electric wheelchair designed for people who are not able to use other interfaces such as a hand joystick, and in particular for patients suffering from amyotrophic lateral sclerosis (ALS). The objective is to control the direction of an electric wheelchair using noninvasive scalp electroencephalogram (EEG).
Keywords:
BCI-controlled wheelchair; Brain-computer interface; BCI; Electric wheelchair; Electroencephalography; EEG; Sensorimotor rhythms; SMR; Shared control; Robotics; Robot
Available in a digital repository NRGL
Control of the electric wheelchair using EEG classification
Electric wheelchairs are some of the most important devices to assist physically handicapped persons. This paper presents the concept of brain controlled electric wheelchair designed for people who ...
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