<abstract xmlns="http://www.w3.org/1999/xhtml">

In this study, we explore innovative strategies for enhancing energy efficiency in Wireless Sensor Networks (WSNs), with a focus on the IQRF network. Our approach integrates dynamic sleep scheduling and data collection methods to optimize battery usage and extend the network’s operational lifespan. We introduce a battery life estimation model, taking into account various factors such as data collection frequency and network size. This model is instrumental in predicting battery longevity under different operational scenarios. Additionally, we develop a practical tool in the form of an API and an online calculator, aimed at assisting network designers in planning and maintaining energy-efficient WSNs. Our results, derived from a case study involving a CO2 sensor network, demonstrate the effectiveness of our methodologies in real-world applications. The study concludes that implementing dynamic data collection and sleep scheduling significantly enhances battery life, offering a valuable contribution to the sustainability and reliability of WSNs.
</abstract>

Dynamic Data Enhancing Battery Efficiency Through Collection Scheduling in IQRF Wireless Sensor Networks

<abstract xmlns="http://www.w3.org/1999/xhtml">

This work deals with digital image processing using the steganography technique in real life. Various steganography techniques face data authentication, data security, and copyright issues. Due to the fact that the problem of data security is currently very topical, these techniques are often sought after. This is related to the constant development of new algorithms that provide solutions that will safely hide the secret message in the image and at the same time will be resistant to various types of attacks. The motivation for writing this work lies in the technique of representing a secret message using a Quick Response code. Later in this work is comparison between our results and results of approach made by scientific community, which works with data hiding within steganographic principles. The secret message is written in the least significant bit plane of the cover image, which ensures that the modification of the image cannot be detected by the naked eye. The proposed solution is evaluated by mathematical quality assessment parameters Peak signal-to-noise ratio, Mean squared error, Normalized cross-correlation and Structural similarity index.
</abstract>

The Influence of Steganographic Methods and QR Code Resolutions on Data Hiding in Cover Images

<abstract xmlns="http://www.w3.org/1999/xhtml">

In this paper, an evaluation of the multiwavelet basis’ capability to represent the ECG signal sparsely was performed. The paper includes the mathematical formulation of sparsity, a brief introduction to the multiwavelet transform, as well as details about the simulation setup used for evaluation. Throughout the paper, various multiwavelets were investigated. The reported results show that the BAT and DB multiwavelets performed well, thus they could be used in the ECG signal sparsification. The investigation also focused on the ECG signals displaying deformations associated with illnesses. Preliminary results suggest that multiwavelets may prove beneficial for diverse processing of ECG signals.
</abstract>

Department of Electronics and Multimedia Communications, Faculty of Electrical Engineering and Informatics

ECG Sparsity Evaluation on a Multiwavelet Basis

<abstract xmlns="http://www.w3.org/1999/xhtml">

This article deals with the issue of usability of an exploratory data analysis tool in the field of medicine. The text portion contains a description of the methods and the visualization procedure. It analyses the current state on usability, medical data visualization and presents the benefits of visualization tools. The goal of this research was to design and implement a suitable visualization tool for the provided dataset, which is the result of cooperation between Technical university of Košice and East Slovak Institute of Heart and Vascular Diseases (VÚSCH) and presents cardiovascular disease data. The resulting web application aimed to provide potential users with an overview of cardiovascular diseases and the influence of their lifestyle on the assumption of such a disease, and for experts to provide different forms of viewing the given data, as well as to facilitate their work. The application was then tested for usability in two iterations where corrections and improvements were made based on the given feedback. Thanks to this iterative procedure and careful reflection of the user feedback the application received endorsement as a valuable tool by the expert evaluator.
</abstract>

Usability of Medical Data Analysis Tool

<abstract xmlns="http://www.w3.org/1999/xhtml">

The paper describes methods of simulation conduction and switching losses of power semiconductors in MATLAB/Simulink. The comparison of simulation results for Infineon’s semiconductor with PLECS Standalone simulation is presented. The results show that the simple ideal switching model of the IGBT in Simulink gives similar results to the PLECS simulation with the Infineon PLECS library.
</abstract>

Power Semiconductor Losses Simulation Capabilities in Matlab/Simulink

AHEAD OF PRINT

Volume 23 (2023): Issue 4 (December 2023)

Volume 23 (2023): Issue 3 (September 2023)

Volume 23 (2023): Issue 2 (June 2023)

Volume 23 (2023): Issue 1 (March 2023)

Volume 22 (2022): Issue 4 (December 2022)

Volume 22 (2022): Issue 3 (September 2022)

Volume 22 (2022): Issue 2 (June 2022)

Volume 22 (2022): Issue 1 (March 2022)

Volume 21 (2021): Issue 4 (December 2021)

Volume 21 (2021): Issue 3 (September 2021)

Acta Electrotechnica et Informatica

 The journal focuses on the publishing of original scientific and professional articles, ones not previously issued in journals, from the research areas of electrical engineering and informatics.Research results in the field of electronics, mechatronics, robotics, automotive electronics, materials engineering, SMART technologies in power engineering, lighting technology, intelligent and automated measuring, and control systems, belong to the first discipline, while issues from the area of informatics, artificial intelligence, machine learning, Big Data, virtual or augmented reality, applied mathematics, software systems, natural language processing, speech recognition, computer vision, cybersecurity, parallel and distributed architectures, communication systems, digital signal processing, Internet of Things or Industry 4.0. to the second.All articles are subject to a blind review (provided by subject experts) assessing the content, scientific and research knowledge, originality, methods, quality and suitability of image material, text structure and style, referencing, and the overall contribution of each article. Based on the review, the editor reserves the right to reject the paper or request the author adjust it. to comply with the review suggestions　There is no deadline for submitting articles; authors can send their contributions at anytime. Before submitting their article by means of the journal's email or the journal's ScholarOne system, the authors should ensure the article is written in the Word or TEX template available in the menu; to be found under the “For Authors” tab.  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 