Search

This article describes the construction of an antenna that operates at frequencies of 1.07, 1.5, and 2.49 GHz and that is fabricated on a flexible polymer substrate using inkjet printing technology. In particular, this article is focused on the preparation and characterization of an antenna starting from the ink formulation for printing a homogeneous, electrically conductive layer using silver nanoparticles. The diameter of the prepared silver nanoparticles ranges from 50 to 200 nm. The inkjet printing technology on flexible polymer substrates offers a wide range of applications where there are high demands for flexibility. In combination with the polymer substrate, inkjet printing enables the production of more complex shapes and curves for antennas that are widely applicable not only in wearable electronic devices but also in plastic cases for portable communication devices. © 2016 The Japan Society of Applied Physics.

This paper deals with the Transaction Level Modelling (TLM) and Register Transfer Level (RTL). The TLM is considered as a practical design approach to the high complexity of the system design. It is highly effective especially in the implementation of hierarchically-arranged system model. This situation is typical for HW/SW Co-design. The RTL covers lower-level design techniques and it is described on a gate level using the signals. Students try to work with both approaches and also solve particular tasks in tuition materials of the Gate Fields and Advanced Architecture of Processors courses. This approach brings better overview of design methods in terms of education; therefore, they can use the same programming language (SystemC) for design of integrated circuit and a firmware of the device. © The Turkish Online Journal of Educational Technology.

In this article a recognition system of isolated sequences based on noise filtration by microphone array is described. The configuration of microphone array has an important issue for clarification of beamformer spatial filtration. Beamforming is a method for processing microphone array data to produce images that represent the distribution of the acoustic source strength. Recognition systems are based on classification systems pattern. In these systems, sounds or sequences of sounds, such as phonemes, groups of phonemes, or words are modeled by distinct classes. The goal of the recognition system is to estimate the correct sequence of classes, sounds, that make up the incoming utterance and hence, the sounds that were reproduced. In particular, many new distance measures between time series have been introduced. The recognition system based on time series analysis, where the Dynamic time warping algorithm based on spatial filtration preprocessing is discussed. © 2015 IEEE.

Carbon nanotubes in the form of entangled network can be used as a multifunctional composite material for a wide range of using. A new and perspective usage is a passive antenna and gas sensing element. The antenna works well at 1.284 GHz. The local reflection minimum is - 11.48 dB. The reflection coefficient r=0.2667. The transmission power in this frequency is 93%. Multiwall carbon nanotubes (MWCNT) network "Buckypaper" was made by the vacuum filtration method of MWCNT aqueous suspension. The sensitivity of multi-wall carbon nanotube (MWCNT) networks of randomly entangled pure and HNO3 oxidized nanotubes to polar and nonpolar organic vapors (ethanol, heptane), has been investigated by resistance measurements. The results demonstrate that the network electrical resistance increases when exposed to organic solvent vapors, and a reversible reaction is observed when the sample is removed from the vapors. The investigated MWCNT networks could be potentially used as sensing elements for sensitive and selective organic vapor detection. © (2014) Trans Tech Publications.

This paper describes the implementation of a software branch exchange laboratory at Tomas Bata University in Zlin. The exchange is based on GNU/Linux and Asterisk software and is used in the Telecommunication Systems course tuition process. It serves for the interconnection of additional exchanges and has a connection to the PSTN (Public Switched Telephone Network). Students create their own exchanges on their PC (using OS GNU/Linux and Asterisk virtualization). The Laboratory Exchange has a higher hierarchy status in the connection scheme.

Užitný vzor se týká mikrovlnné antény s integrovanou funkcí senzoru organických par, zejména pak antény mikropáskového provedení se zemní rovinou, určenou k přenosu informací v bezdrátových sítích, při čemž druhou funkcí antény je možnost detekce organických par. Anténa je tvořena substrátem z elektricky nevodivého materiálu ve tvaru plošného útvaru, na jehož povrchu je nanesena elektricky vodivá funkční vrstva se schopností příjmu/vysílání signálu a současně vratné adsorpce/desorpce molekul organických par., The utility model relates to a microwave antenna with integrated sensor of organic vapors, in particular a microstrip antenna design with ground plane, intended to transfer information in wireless networks, wherein the second antenna is a function of its ability to detect organic vapors. The antenna is composed of a substrate of electrically conducting material in the shape of the sheet, the surface of which is deposited an electrically conductive functional layer with the ability to receive / transmit signal and simultaneously reversible adsorption / desorption of molecules of organic vapors.

Práce se zabývá metodami detekce objektů v obraze využitelných pro monitorování oblasti železničního přejezdu. Popisované metody a algoritmy zpracovávají obrazovou informaci z vhodně umístěné stacionární digitální kamery, která sleduje definovanou oblast. Obsahem práce je popis, implementace a optimalizace navržených algoritmů, jejichž úkolem je detekce a segmentace dynamických i statických objektů a jejich následná identifikace pomocí metod shlukování. Navržené metody mohou ve fúzi např. s radarovými systémy tvořit základ komplexního dohledového systému v definované oblasti zájmu., This doctoral thesis deals with methods for objects detection in the image usable for the railway crossing monitoring. The described methods and algorithms process the image information from appropriately positioned stationary digital camera that monitors the defined area. The work provides description, implementation and optimization of selected algorithms. The task of these algorithms is detection and segmentation of dynamic and static objects and their subsequent identification by clustering methods. The proposed methods can form the basis of a complex monitoring system in the defined region of interest., Katedra elektrotechniky, Po představení Ing. Zdeňka Šilara byla komise seznámena se stanoviskem školitele k disertační práci a osobě disertanta. Doktorand seznámil komisi se svojí disertační prací formou prezentace. Poté byly předneseny posudky oponentů a doktorand zodpověděl otázky a reagoval na připomínky oponentů. V následné veřejné diskusi disertant odpovídal na otázky členů komise, které jsou uvedeny na samostatných listech. Na závěr proběhlo tajné hlasování. Protokol o výsledcích hlasování tvoří samostatnou přílohu.

Stream ciphers are essential in digital communications working in real-time. A key-stream which is used fir the encryption purposes is usually created by pseudorandom number generators. These generators can be implemented as chaotic systems with quantization unit. As a result, a binary sequence represented the key-stream is obtained. When a cryptanalyst want to break this type of stream cipher, he must reveal an initial condition of the chaotic system which produces the key-strewn. This paper investigates possibilities of evolutional algorithms for the searching for that initial condition. Experiments show very promising results in breaking chaotic stream ciphers.

Chaotic systems are extremely sensitive to control parameters and initial conditions. This feature is effective in the field of cryptography. In this paper we propose image encryption scheme which is based on the chaotic maps of Peter de Jong's attractor. The image is transferred into the wavelet domain and then appropriate modifications of the wavelet coefficients are done. The main purpose of application of the wavelet transformation is to reduce computation time needed for the encryption process and to reach higher or similar security of the encrypted image.

Fractal compression based on Iterated Function Systems (IFS) has a great potential to be useful in other areas of signal processing than just in the data compression field. This potential is done due to features of fractal parameters. The lossy feature of this method causes elimination of some redundant elements and thus it can be applied for reconstruction of noised signals purposes. Independence on resolution allows enlarging images and viewing them in many scales. Also fractal parameters sensitivity for image reconstruction can be very helpful for security purposes. This work deals with these features and practical demonstration of their usage.

It is commonly known that chaotic systems are extremely sensitive to initial parameters and these systems can be very helpful in the field of cryptography from this reason. Logistic maps of deterministic chaos can be used for the generation of encryption key. This key is then used for the image encryption. This paper proposes usage of chaotic encryption and its application in the wavelet domain of dyadic decomposed image. Modification of wavelet components leads to massive degradation of image. Decryption with unauthorized key is very difficult due to the initial parameter sensitivity of this encryption scheme.

Many image encryption schemes based on chaotic iterative maps are very expensive in terms of processing speed. This inconvenient feature causes the inapplicability in real-time processes. Hence, encryption scheme must be projected at low-level. This paper proposes hardware solution of image encryption with keeping the high security of encrypted image and speeding up the encryption process.

Self-adaptiveDE is one of the most efficient and popular modifications of evolution algorithm (Differential Evolution). The study deals with the possibility of using the entropy evaluation of population for SaDE algorithm modification, with an impact on its convergence towards global extreme. Further, the unavoidable increase of computational complexity is discussed. The paper proposes an algorithm based on the efficiency principles of SaDE algorithm. This proposed algorithm uses the above mentioned entropy calculation. In order to increase the algorithm efficiency, a recursive differential evolution was applied; it modifies its scale factors to gain the best convergence abilities, with respect to its robustness. Detailed performance comparisons of this algorithm on the currently used benchmark-functions are included.

A new approach for erasure codes design with regards to digital multimedia specificity is introduced. The experimental results on coding effectiveness are obtained. Comparison with reference to LT (Luby Transform) codes is performed. The proposed erasure codes allow to achieve more robust decoding for high packet-loss ratios. The designed encoding algorithm is well-fit for hardware parallel processing.

Chaotic systems are extreme initial parameters sensitive and this feature can be very helpful in the field of cryptography. This paper proposes encryption scheme of audio signal in wavelet domain when logistic maps of deterministic chaos are used for generation of encryption key. Modification of wavelet coefficients may lead to massive degradation of audio signal and this alteration will result to inaudibility.

For measurement of some analog signal as voltage, current, resistance etc. and for a different input signal level on multichannel single-ended analog-to-digital converter is necessary to have a variable gain for all input channels. The proposed solution is based on an instrumental operational amplifier on an input stage, where gain level reaches value of 384. An operational amplifier with gain level between 1 and 30 and with offset voltage control is used in the middle stage. Module is ended by 16-bit analog-to-digital converter with a parallel interface compatible with digital signal processors, microcontrollers etc. © 2004 IFAC.

Použití kódování v oblasti výpočetní techniky i v oblasti paměťových médií se stalo rozhodující podmínkou růstu spolehlivosti samočinných počítačů již při prvních aplikacích a jejich význam roste s každým inovačním krokem v oblasti polovodičové i optické technologie. Zabezpečovací kódy se uplatňujívšude tam, kde je nutné eliminovat vliv rušení, které je způsobené prostředím., Use of coding in the field of and in the field of storage media has happened a main condition of growing up reliability of computers during first applications and their significance has grown up with every inovation step in the field of semiconductor and optical technology. Security codes are used in the fields where it is necessary to eliminate influence of disturbances which is caused by the environment.

Cílem práce je vytvořit návrh počítačové sítě pro Gymnázium a SOŠ. Popisuje se zde výběr typů síťových prvků, jejich množství a umístění, dále je zde také navrhnut rozvod síťové infrastruktury v budově školy., The aim of work is formed project of computer´s network for Gymnasium and SOŠ. There is described selection types of network components, their quantities and location and there is also projected network infrastructure distribution at school building.

Cílem práce je vytvořit návrh počítačové sítě pro Gymnázium a SOŠ. Popisuje se zde výběr typů síťových prvků, jejich množství a umístění, dále je zde také navrhnut rozvod síťové infrastruktury v budově školy., The aim of work is formed project of computer´s network for Gymnasium and SOŠ. There is described selection types of network components, their quantities and location and there is also projected network infrastructure distribution at school building.

Diplomová práce je zaměřena na návrh a vypracování projektové dokumentace polyfunkčního domu ve městě Dobříš. Polyfunkční dům dům je pravidelného obdélníkového tvaru o rozměrech 16,12m x 26,12m. Dům má jedno podzemní a tři nadzemní podlaží, poslední nadzemní podlaží je obytné podkroví. Vodorovný i svislý konstrukční systém je z BS Klatovy, střecha je sedlová s vikýři., The master´s thesis is focused on the design and preparation of project documentation of the polyfunctional house in Dobříš city. Polyfunctional house is a rectangular shape with dimensions of 16,12 x 26,12 m. The building has one underground and three floors, the last floor is the attic. Horizontal and vertical structural system is BS Klatovy, the roof is gabled with a skylights.

Tato práce popisuje navrženou metodologii pro návrh systémů odolných proti poruchám v FPGA schopnou ochránit systém před projevy přechodných a trvalých poruch. Oprava přechodné poruchy je prováděna částečnou dynamickou rekonfigurací. Oprava omezeného počtu trvalých poruch je založena na použití odolných architektur využívajících menší množství zdrojů než předchozí použitá architektura. Vadná část FPGA tak není dále využívána. Tato technika je založena na použití předkompilovaných konfigurací uložených v externí paměti. Pro snížení paměťových nároků pro uložení konfiguračních bitových posloupností je použita technika relokace., The work presents a methodology of fault tolerant system design into an FPGA with the ability of the transient fault and the permanent fault mitigation. The transient fault mitigation is done by the partial dynamic reconfiguration. The mitigation of a certain number of permanent faults is based on using a specific fault tolerant architecture occupying less resources than the previosly used one and excluding the faulty part of the FPGA from further use. This inovative technique is based on the precompiled configurations stored in an external memory. To reduce the required space for a partial bitstream the relocation technique is used.

Tato disertační práce představuje metodiku vytvořenou pro návrh synchronizace a obnovy stavu systému odolného proti poruchám. Metoda synchronizace stavu navržená podle popsané metodiky umožňuje opravit stav paměťových prvků systému, které jsou implementovány v aplikační logické vrstvě číslicového návrhu v FPGA a jejichž hodnoty nelze opravit částečnou dynamickou rekonfigurací. Vytvořená metodika popisuje možné způsoby návrhu metod synchronizace s ohledem na granularitu TMR, závislost funkce systému na předchozích stavech a samotné architektuře číslicového systému. Metodika se blíže zaměřuje na hrubozrnné architektury TMR a problematiku synchronizace stavu v systémech řízených stavovými automaty nebo procesorem. V této práci je využití vytvořené metodiky předvedeno na návrhu metod synchronizace stavu pro systém řadiče sběrnice CAN odolného proti poruchám a zabezpečený systém mikrokontroléru NEO430. Při experimentálním ověření mechanismů opravy a obnovy stavu systému po poruše byla ověřena jak správná funkce systémů, tak jejich spolehlivost v přítomnosti simulovaných poruch typu SEU. V závěru práce jsou diskutovány dosažené experimentální výsledky a přínos práce., In this Ph.D. thesis, a new methodology for the fault tolerant system state synchronization design and its recovery from faults is presented. A state synchronization method designed by means of the proposed methodology allows to repair the state of sequential logic elements implemented in the FPGA application logic, which cannot be repaired by the partial dynamic reconfiguration. The proposed methodology describes possible state synchronization design methods with respect to TMR granularity, dependence of the system function on its previous states and the system architecture. The methodology focuses on coarse-grained TMR architectures and state synchronization in the systems controlled by means of finite state machines or a processor. The use of the methodology is demonstrated on the CAN bus control system and the microcontroller NEO430, for which specific synchronization methods were designed. The systems reliability and new ability of the systems for recovery from faults were verified in the presence of simulated SEU faults. The experimental results and the contribution of this thesis are discussed in the conclusion.

Diplomová práce je zaměřena na návrh a vypracování projektové dokumentace polyfunkčního domu. Objekt je navržen na parcele v Benešově ulici, v Kutné Hoře. Návrh domu respektuje územní plán obce a zároveň dotváří stávající zástavbu. Objekt má jedno podzemní a čtyři nadzemní podlaží, poslední nadzemní podlaží je půda. V objektu je podzemní garáž, dva obchody a šest bytových jednotek. Objekt je navržen z konstrukčního systému Porotherm., The master´s thesis is focused on the preparation and design of project documentation of the multi-functional building. The building is designed on land in Beneš street in Kutná Hora. The concept of the building respects the territorial plan of the city and complements the existing buildings. The building has one underground and four floors, the last floor is the attic. There is an underground garage, two stores and six flats. The building is designed from construction system Porotherm.

Projekt se zabývá stavbou polyfunkčního bytového domu s 5-ti byty, prodejnou a advokátní kanceláří. Objekt se nachází v obci Želechovicích nad Dřevnicí na rovinatém terénu. Dům je navržen v konstrukčním systému Porotherm, zastřešený sedlovou střechou 45°. Bytový dům je navržen v souladu s územním plánem obce Želechovice nad Dřevnicí, svým charakterem navazuje na okolní zástavbu a v práci jsou respektovány všechny právní předpisy, které se týkají projektování staveb. Výkresová část byla zpracována počítačem v programu AutoCad. Součástí projektové dokumentace je část výkresová, textová a výpočtová. K projektu je přiřazeno tepelně technické posouzení a požární ochrana objektu., The project deals with the construction of a multifunctional residential building with 5 apartments, shop offices and law. The building is located in the village of Želechovice Dřevnicí on flat terrain. The house is designed in a structural system Porotherm, covered gable roof 45 °. The building is designed in accordance with the master plan of the municipality of Želechovice Dřevnicí, its character builds on the surrounding buildings and at work are respected by all laws and regulations relating to the design of buildings. The drawing part was processed by computer in AutoCad. Part of the project documentation is part of the drawing, text and calculation. The project is assigned a technical assessment of thermal and fire protection of the building.

Cílem práce je vytvořit návrh počítačové sítě a počítačových učeben pro Gymnázium a Střední odbornou školu Frýdek-Místek. Je v ní popsán také harmonogram celého projektu a včetně jeho finančního zhodnocení., The goal of this thesis is proposal of computer network and computer classrooms for Gymnázium a Střední odborná škola Frýdek-Místek. It also describes schedule of whole project and its financial budged.

Cílem práce je vytvořit návrh počítačové sítě a počítačových učeben pro Gymnázium a Střední odbornou školu Frýdek-Místek. Je v ní popsán také harmonogram celého projektu a včetně jeho finančního zhodnocení., The goal of this thesis is proposal of computer network and computer classrooms for Gymnázium a Střední odborná škola Frýdek-Místek. It also describes schedule of whole project and its financial budged.