Solid Foams Based on Acetalized PVAl

Práce se zabývá přípravou tuhých hydrofilních pěn z acetalů PVAl. Pro výrobu tuhých pěn byl použit postup založený na napěnění reakční směsi plynnými zplodinami. V rámci práce byla také studována možnost ukotvení aktivních složek do hmoty pěny (drceného lignitu jako účinného sorbentu pro těžké kovy).This diploma thesis deals with the preparation of solid hydrophilic sponges made of acetalized PVAl. The sponges were produced by foaming by gaseous reaction by-product. The experimental work also includes the study of active compound immobilization into the sponge (finely ground lignite as a heavy metal sorbent).

Hybrid extension for Advanced Technology Zone

This article deals with the software extension for metallic loops. This extension consists of using the binary signal which can be generated by the Control and Indicating Equipment (CIE) to unite analog and digital detectors. Designed improvement can be applied to all existing modes of analog CIE such as Normal Closed (NC), End of Line (EOL) or Advanced Technology Zone (ATZ). It can be also applied to all common digital bus. © The Authors, published by EDP Sciences, 2017

Implementation of voice activity detectors using open-source libraries in C language

Tato diplomová práce pojednává o problematice detekce hlasové aktivity. Jsou zde teoreticky popsány dva typy: energetický a statistický detektor, jejichž funkce je ověřena v prostředí Matlab. Dále je řešena implementace detektorů v jazyce C za pomoci standardních knihoven a open-source knihoven GSL. Realizované algoritmy jsou porovnány z hlediska rychlosti výpočtu, paměťové náročnosti a zátěže jednotlivých matematických operací v rámci celého algoritmu. Bylo provedeno porovnání rychlosti výpočtu v závislosti na velikosti zpracovávaného okna.This diploma thesis discusses the issue of Voice Activity Detection. There are two types of detectors described: energetic and statistics. Their funktionality is proved in the Matlab environment. Further, the implemetation of VADs is made through C language with standard libraries and GSL open-source libraries. The realized algorithms are compared in the scope of processing time of computation, memory management and a single mathematical operations stress. Also a comparism of the processing time according to segment length was made.

Inpainting of Missing Audio Signal Samples

V oblasti zpracování signálů se v současné době čím dál více využívají tzv. řídké reprezentace signálů, tzn. že daný signál je možné vyjádřit přesně či velmi dobře aproximovat lineární kombinací velmi malého počtu vektorů ze zvoleného reprezentačního systému. Tato práce se zabývá využitím řídkých reprezentací pro rekonstrukci poškozených zvukových záznamů, ať už historických nebo nově vzniklých. Především historické zvukové nahrávky trpí zarušením jako praskání nebo šum. Krátkodobé poškození zvukových nahrávek bylo doposud řešeno interpolačními technikami, zejména pomocí autoregresního modelování. V nedávné době byl představen algoritmus s názvem Audio Inpainting, který řeší doplňování chybějících vzorků ve zvukovém signálu pomocí řídkých reprezentací. Zmíněný algoritmus využívá tzv. hladové algoritmy pro řešení optimalizačních úloh. Cílem této práce je porovnání dosavadních interpolačních metod s technikou Audio Inpaintingu. Navíc, k řešení optimalizačních úloh jsou využívány algoritmy založené na l1-relaxaci, a to jak ve formě analyzujícího, tak i syntetizujícího modelu. Především se jedná o proximální algoritmy. Tyto algoritmy pracují jak s jednotlivými koeficienty samostatně, tak s koeficienty v závislosti na jejich okolí, tzv. strukturovaná řídkost. Strukturovaná řídkost je dále využita taky pro odšumování zvukových nahrávek. Jednotlivé algoritmy jsou v praktické části zhodnoceny z hlediska nastavení parametrů pro optimální poměr rekonstrukce vs. výpočetní čas. Všechny algoritmy popsané v práci jsou na praktických příkladech porovnány pomocí objektivních metod odstupu signálu od šumu (SNR) a PEMO-Q. Na závěr je úspěšnost rekonstrukce poškozených zvukových signálů vyhodnocena.Recently, sparse representations of signals became very popular in the field of signal processing. Sparse representation mean that the signal is represented exactly or very well approximated by a linear combination of only a few vectors from the specific representation system. This thesis deals with the utilization of sparse representations of signals for the process of audio restoration, either historical or recent records. Primarily old audio recordings suffer from defects like crackles or noise. Until now, short gaps in audio signals were repaired by interpolation techniques, especially autoregressive modeling. Few years ago, an algorithm termed the Audio Inpainting was introduced. This algorithm solves the missing audio signal samples inpainting using sparse representations through the greedy algorithm for sparse approximation. This thesis aims to compare the state-of-the-art interpolation methods with the Audio Inpainting. Besides this, l1-relaxation methods are utilized for sparse approximation, while both analysis and synthesis models are incorporated. Algorithms used for the sparse approximation are called the proximal algorithms. These algorithms treat the coefficients either separately or with relations to their neighbourhood (structured sparsity). Further, structured sparsity is used for audio denoising. In the experimental part of the thesis, parameters of each algorithm are evaluated in terms of optimal restoration efficiency vs. processing time efficiency. All of the algorithms described in the thesis are compared using objective evaluation methods Signal-to-Noise ratio (SNR) and PEMO-Q. Finally, the overall conclusion and discussion on the restoration results is presented.

Control and indicating equipment communicating via the peripheral component interconnect express bus

Nowadays, the Intruder Alarm system is commonly used to protect the life, health and the possession of people in big companies. However, these systems have limited options for managing and remote control. This lack is very often criticized by big companies which want to use the Intruder Alarm System with other applications like Access and Attendance control. The aim of this article is to design a Control and Indicating Equipment which can be implemented into commercially made Personal Computer as expansion card. The designed card provides the main function of the Intruder Alarm system which can be further extended by other applications. The system consists of external communication like Universal Serial Bus, Ethernet and General Packet Radio Service interface. Each individual part of the system is driven by a single microcontroller ATmega328P which can handle communication and evaluation of the current state obtained by devices connected to it. The design can offer all alarm and non-alarm visualization of smart control like irrigation, lights control, audio system, etc. The whole design is driven by the proper standardization and the design consists of every schematic which comes with the explanation. © 2020, Institute of Advanced Engineering and Science. All rights reserved

Sterowanie bezszczotkowym silniem DC z wykorzystaniem [latformy Arduno

The Brushless DC (BLDC) motors are often used in many situations in many sectors. These motors are widely used in the application of the Unmanned Aerial Vehicles (AUV). However, BLDC motors need to be controlled by the external system to ensure flawless and reliable function. Using the Electronic speed control (ESC) for the brushless motor, every motor can be controlled by any platforms such as Arduino. The Arduino platform was selected due to its simplicity, availability at the market and the cost-effectiveness. The aim of this research is designing the motor control for the BLDC motor on the Arduino platform. The designed system should be used by the UAV using propellers. This paper also includes the software implementation for the motor control. An implementation is developed to study the performance of the system for wide range speed control and power quality improvement. © 2018, Wydawnictwo SIGMA-NOT. All rights reserved.W artykule opisano zdalne sterowanie bezszczotkowym silniekiem DC w zastosowanou do dronów. Wykorzystano platformę Arduno i system ESC – electronik speed control.Przedstawiono oprogramowanie I badania przy różnych warunkach pracy.Ministry of Education, Youth and Sports of the Czech Republic within the National Sustainability Programme [LO1303 (MSMT-7778/2014)]; European Regional Development Fund under the project CEBIA-Tech [CZ.1.05/2.1.00/03.0089]; Internal Grant Agency of Tomas Bata University [IGA/CebiaTech/2018/004

Electromagnetic compatibility of arduino development platform in near and far-field

The electromagnetic compatibility is a very popular scientific discipline that widely affects the electronic devices. The electromagnetic radiation can be associated with many distortion and errors in the microcontrollers. The main purpose of this article is to examine the EMC of a cheap development kit, namely Arduino. In addition, the article provides the comparison of the results in terms of electromagnetic susceptibility and interference. © 2017, Research India Publications. All rights reserved.CZ.1.05/2.1.00/03.0089, ERDF, European Regional Development Fund; MSMT-7778/2014, MŠMT, Ministerstvo Školství, Mládeže a Tělovýchov

Advanced hardware protection of metallic loops

This article deals with the advanced protection of metallic loops using addition electronic components. The main goal of this article is to improve especially Advanced Technology Zone (ATZ), which is the most applied method. The improvement consists of protection against overvoltage which can destroy the Control and Indicating Equipment (CIE) and it consist of adding more states which have the impact of numbers of connected detectors. All ideas are introduced with technical details, schematic and every idea also comes with an explanation. © The Authors, published by EDP Sciences, 2017

A monitoring network system and its practical demonstration on a model technological process

In order to deepen students' practical knowledge and understanding of the “Computer Networks” subject, a Monitoring Network System was developed that is able to read, collect and distribute data describing real technological processes. The Monitoring System design is based on Client/Server architecture. The model is represented by the real chemical reactor, which was created for the study of the enzymatic hydrolysis of potentially hazardous chrome-tanned wastes generated during leather manufacturing. Final system should be implemented at the university to the graduates and the system should be modular with possible communication support. The setup of the monitoring system comes with all needed explanation and procedures. © 2018, World Scientific and Engineering Academy and Society. All rights reserved