Control Algorithms Realization

Práce se zabývá řízením Arduina pomocí programu MATLAB, Simulink a jejich doplňky umožňující propojení těchto platform. První část je věnována seznámení s platformou Arduino a komponenty, se kterými pracuji. Dále se nachází seznámení se softwarem od společnosti MathWorks a jsou zde popsány potřebné kroky umožňující propojení tohoto softwaru s hardwarem Arduino. Další část práce je věnována návrhu regulace pro zvolený model ventilátoru a následné ověření funkčnosti pomocí číslicové simulace. Po ověření správnosti výpočtů jsou regulátory implementovány do modelu. Na konci práce je vypracován návod pro práci s modelem.The thesis deals with Arduino control using MATLAB, Simulink and their add-ons to connect these platforms. The first part is devoted to acquaintance with the Arduino platform and components that I work with. There is also an introduction to MathWorks software and describes the necessary steps to connect this software to Arduino hardware. The next part of the work is devoted to the design of control for the selected fan model and subsequent verification of functionality using numerical simulation. After verifying the accuracy of the calculations, the controllers are implemented to the model. At the end of the work, a guide for working with the model is developed.352 - Katedra automatizační techniky a řízenívýborn

Analysis of a Partly Sprung Drive

During the operation of trams in citiesthe bogies and drives are dynamically loaded throughacceleration, deceleration, passaging curves andevidently by the roughness of the tram track. Theseadded dynamic loads can significantly increase thewearing of tram drive components. The aim of thisanalysis is the investigation of stress state and motionsof the gearbox hinge (support). For this purpose,strain gauges and optical system Qualisys are used.Special type of the strain gauges arrangement formeasuring tension and bend together is designed.Acquired data are processed in the software Matlaband in the user interface of the Qualisys software

Biometric Authentication Using the Unique Characteristics of the ECG Signal

ECG is a biological signal specific for each person that is hard to create artificially. Therefore, its usage in biometry is highly investigated. It may be assumed that in the future, ECG for biometric purposes will be measured by wearable devices. Therefore, the quality of the acquired data will be worse compared to ambulatory ECG. In this study, we proposed and tested three different ECG-based authentication methods on data measured by Maxim Integrated wristband. Specifically, 29 participants were involved. The first method extracted 22 time-domain features – intervals and amplitudes from each heartbeat and Hjorth descriptors of an average heartbeat. The second method used 320 features extracted from the wavelet domain. For both methods a random forest was used as a classifier. The deep learning method was selected as the third method. Specifically, the 1D convolutional neural network with embedded feed-forward neural network was used to classify the raw signal of every heartbeat. The first method reached an average false acceptance rate (FAR) 7.11% and false rejection rate (FRR) 6.49%. The second method reached FAR 6.96% and FRR 21.61%. The third method reached FAR 0.57% and FRR 0.00%

Innovative bidirectional isolated high-power density on-board charge for vehicle-to-grid

This paper deals with developing and implementing a bidirectional galvanically isolated on-board charger of a high-power density. The power density of the new charger was 4 kW/kg and 2.46 kW/dm(3), and the maximum efficiency was 96.4% at 3.4 kW. Due to the requirement to achieve a high-power density, a single-stage inverter topology was used. Regarding switching losses, due to the topology of the circuit with so-called hard switching, the switching frequency was set to 150 kHz. A laboratory prototype was built to verify the properties and operating principles of the described charger topology. The on-board charger has been tested in a microgrid test platform. Due to the parasitic properties of the transformer and other electronic components, overvoltage with subsequent oscillations occurred on the primary side of the transformer and damped resonance on its secondary side. These parasitic properties caused interference and especially voltage stress on the semiconductor elements. These undesirable phenomena have been eliminated by adding an active element to the charger topology and a new transistor control strategy. This new switching control strategy of transistors has been patented.Web of Science2221art. no. 847

Bioaccumulation of chemical elements at post-industrial freshwater sites varies predictably between habitats, elements and taxa: A power law approach

Elevated environmental levels of elements originating from anthropogenic activities threaten natural communities and public health, as these elements can persist and bioaccumulate in the environment. However, their environmental risks and bioaccumulation patterns are often habitat-, species- and element-specific. We studied the bioaccumulation patterns of 11 elements in seven freshwater taxa in post-mining habitats in the Czech Republic, ranging from less polluted mining ponds to highly polluted fly ash lagoons. We found nonlinear, power-law relationships between the environmental and tissue concentrations of the elements, which may explain differences in bioaccumulation factors (BAF) reported in the literature. Tissue concentrations were driven by the environmental concentrations in non-essential elements (Al, As, Co, Cr, Ni, Pb and V), but this dependence was limited in essential elements (Cu, Mn, Se and Zn). Tissue concentrations of most elements were also more closely related to substrate than to water concentrations. Bioaccumulation was habitat specific in eight elements: stronger in mining ponds for Al and Pb, and stronger in fly ash lagoons for As, Cu, Mn, Pb, Se, V and Zn, although the differences were often minor. Bioaccumulation of some elements further increased in mineral-rich localities. Proximity to substrate, rather than trophic level, drove increased bioaccumulation levels across taxa. This highlights the importance of substrate as a pollutant reservoir in standing freshwaters and suggests that benthic taxa, such as molluscs (e.g., Physella) and other macroinvertebrates (e.g., Nepa), constitute good bioindicators. Despite the higher environmental risks in fly ash lagoons than in mining ponds, the observed ability of freshwater biota to sustain pollution supports the conservation potential of post-industrial sites. The power law approach used here to quantify and disentangle the effects of various bioaccumulation drivers may be helpful in additional contexts, increasing our ability to predict the effects of other contaminants and environmental hazards on biota.info:eu-repo/semantics/publishedVersio

The Russian Palestine

Russian Palestine Diploma thesis Vojtěch Kolář Praha 2013 Abstract This diploma thesis entitled "The Russian Palestine" deals with activities of the Russian Orthodox Church and Russian diplomatic corps designed to help Russian pilgrims to the holy places in Palestine as well as local Orthodox believers in the Levant in the 19th and beginning of 20th century. These activities were accompanied by considerable tension not only between Russian activists in Palestine and in Russia, but also in their encounters with Greek hierarchy in Jerusalem and Constantinople as well as with Western diplomats and missionaries pursuing Catholic and Protestant interests in the same area. The aim of this thesis is to offer an insight into motivations, ways and results of their activities in Palestine and to call attention to the difficulties they were facing. This work is neither an apology nor a criticism of either of the instruments of Russian influence - the Russian Orthodox Ecclesiastical Mission in Jerusalem (since 1847) and Imperial Orthodox Palestine Society (since 1882) respectively. Because of the broadness of the subject it was not always possible to follow strict historiographic methods. Therefore this thesis is concerned mostly with biographical material of some of the most influential Russian personalities of the..

Video games

This thesis is based on a detailed analysis of various topics related to the question of whether video games can be art. In the first place it analyzes the current academic discussion on this subject and confronts different opinions of both supporters and objectors of the idea, that video games can be a full-fledged art form. The second point of this paper is to analyze the properties, that are inherent to video games, in order to find the reason, why cultural elite considers video games as inferior in relation to traditional forms of art. In addition to features of games like entertainment, competitivness and unproductivity, this part examines the circumstances that have an impact on current game design, like mass popularity and game developers pandering to wide audiance. Due to these circumstances, the majority of video games can be considered kitsch. Following passage through the application of theory of kitsch on specific video game shows and identifies tendencies in game design that cause this condition. Conclusion of the second chapter, however, shows that some video games exhibit characteristics that are generally regarded as positive elements of art works and by that they avoid being branded as kitsch. The last part of this thesis, based on cluster theory of art, identifies and analyzes..

The Russian Palestine

Russian Palestine Diploma thesis Vojtěch Kolář Praha 2013 Abstract This diploma thesis entitled "The Russian Palestine" deals with activities of the Russian Orthodox Church and Russian diplomatic corps designed to help Russian pilgrims to the holy places in Palestine as well as local Orthodox believers in the Levant in the 19th and beginning of 20th century. These activities were accompanied by considerable tension not only between Russian activists in Palestine and in Russia, but also in their encounters with Greek hierarchy in Jerusalem and Constantinople as well as with Western diplomats and missionaries pursuing Catholic and Protestant interests in the same area. The aim of this thesis is to offer an insight into motivations, ways and results of their activities in Palestine and to call attention to the difficulties they were facing. This work is neither an apology nor a criticism of either of the instruments of Russian influence - the Russian Orthodox Ecclesiastical Mission in Jerusalem (since 1847) and Imperial Orthodox Palestine Society (since 1882) respectively. Because of the broadness of the subject it was not always possible to follow strict historiographic methods. Therefore this thesis is concerned mostly with biographical material of some of the most influential Russian personalities of the..