Student EEICT 2022
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- ItemOptimization of wavelet transform in the task of intracardiac ECG segmentation(Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií, 2022) Ředina, R.My work deals with the selection of an appropriate wavelet transform setting for feature extraction from intracardiac ECG recordings. The studied signals were obtained during electrophysiological examinations at the Department of Pediatric Medicine, University Hospital Brno. In this paper, several wavelets are tested for feature extraction which is followed by adaptive thresholding to detect atrial activity from the extracted features. The procedure is evaluated using the F-score. Although the presented procedure does not appear to be overall effective for intracardiac signal segmentation, it certainly does not reject the use of wavelet transforms in combination with advanced machine learning, neural network, or deep learning techniques.
- ItemSEM Micromanipulator as Current Collector for Battery In-situ Characterization(Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií, 2022) Klvač, O.; Kazda, T.; Fam, Y.; Novák, L.The aim of the work is to develop an in-situ method for electrode microstructure investigation by scanning electron microscopy (SEM). In the first part, the preparation of a model battery using FIB-SEM system is described, which consists of lithium metal, ionic liquid, and lithium titanate oxide (LTO) attached on a micromanipulation needle by platinum deposition. The needle is used for handling and at the same time as a current collector, which facilitates subsequent analysis. Open-circuit voltage (OCV), cyclic voltammetry (CV), and galvanostatic cycling measurements (GCPL) was done on the cell assembled (and imaged) in SEM. After seven complete cycles, a cross-section of LTO electrode using FIB was prepared and the surface solid electrolyte interface (SEI) layer was observed. Challenges connected with battery preparation are described and possible solutions for future testing are proposed. The work is evolved in cooperation with Thermo Fisher Scientific Brno.
- ItemComplex systems resilience qualification(Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií, 2022) Dvorský, P.; Baštán, O.; Fiedler, P.This paper focuses on resilience qualification and propose a new method of measuring resilience within the systems. Within the paper is discussed the concept of resilience. Further, there is a defined general complex system with its main system functions. Based on that, the paper proposes a methodology and a model by which could be resilience of systems evaluated. An example of an application of a proposed resilient metric to a specific system is also discussed here.
- ItemNanoporous Enzyme-Based Impedimetric Biosensor(Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií, 2022) Košelová, Z.The ordered nanopores surfaces has been studied in the field of biosensors for the detection of affinity interactions such as antigen-antibody or nucleic acid hybridization. Nanopores are frequently fabricated by anodic oxidation of aluminium. This method is practically simple method of highly ordered pore formation, but is not suitable for massive production. The principle of detection is usually based on the degree of pore blockage by biomolecular interaction that allows a sensitive electrochemical response. Here we show the development and characterization of the nanopore-based enzymatic biosensor for the detection of analytes. We performed and tested the concept of the simple and versatile method of nanopores formation on the electrode using non-conductive polystyrene nanoparticles. The variability in pore size was modulated by nanoparticles diameter (40 and 80 nm). We measured response of our designed biosensor using electrochemical impedance spectroscopy in presence of redox mediator at low potential. The smaller diameter of nanopores increases charge transfer resistance. Biosensors with 80 nm nanoparticles had behaviour similar to reference without nanoparticles, therefore the pore was too wide for this design. The limit of detection from Rct showed to be at most 0.01 mM for every sample type. This proposed biosensor contributes to the basic knowledge about nanopores sensors, and it could have a potential, for example, in the development of ―point of care‖ devices.
- ItemStudy of the effect of tissue conductivity on electroporation(Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií, 2022) Hemzal, M.; Aubrecht, V.This paper deals with two different dynamic models of electrical conductivity and a static model for electroporation. Those models were used to calculate electric field distribution in the tissue, the current and the volume of the tissue that will be subjected to electroporation. The results are than compared to the experimental model. Improved model can be used to better predict ablation zones.