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Publications - 6383

Cybersecurity and cybercrime: Current trends and threats

Anetta Zielińska Aleksandra Kuzior Inna Tiutiunyk Roland Kelemen

Publication Name: Journal of International Studies

Publication Date: 2024-01-01

Volume: 17

Issue: 2

Page Range: 220-239

Description:

The rapid development of digital technologies and their active implementation in all spheres of the economy, on the one hand, contribute to increased control over the activities of economic entities, and on the other hand, create new challenges associated with the dynamic development of cybercrime. The purpose of the article is to analyze the global trends in cybercrime in 2016-2023 (by calculating national levels of cybercrime) and to model the mechanisms of combating it in order to form a global, open and safe cyberspace, protect the population from cyber threats and cyber fraud, increase the effectiveness of financial monitoring procedures and control over transactions in cyberspace. The article presents the dominant directions, evolutionary, temporal and spatial patterns of the development of crime in cyberspace, clustering of the countries,and identification of leaders and outsiders in the field of cybercrime (through visualization density maps based on the construction of self-organized Kohonen maps). The results of the calculations confirm a significant increase in the level of cybercrime in the world since 2016 (in particular, due to the COVID-19 pandemic and active digital transformation). A comparative analysis of the indicator across countries made it possible to distinguish those with the highest rates of cybercrime (Slovenia, Iceland, Moldova, Georgia) and those with a significantly higher level of cyber security (Greece, Belgium, France, Germany).

Open Access: Yes

DOI: 10.14254/2071-8330.2024/17-2/12

Sustainability Indicators in Industrial Robotic Systems

Péter Galambos Adam Csapo Csaba Hajdu Károly Széll Zoltán Szilágyi

Publication Name: Chemical Engineering Transactions

Publication Date: 2023-01-01

Volume: 107

Issue: Unknown

Page Range: 79-84

Description:

Nowadays, the application of industrial robots in manufacturing is widespread to automatize tedious and repeatable precision-sensitive processes. Modern robotic cells compete with the human workforce and specialized industrial machines in general efficiency. Additionally, robotic cells can be typically reprogrammed for different tasks, thus providing flexible applications, especially compared to more traditional methods. Advanced autonomous and intelligent capabilities are widespread in modern robotic systems, supplying quantitative factors like higher availability, fault tolerance, precision, and system flexibility. Robotic systems typically work measurably more efficiently regarding resource usage, electrical power, and waste than other industrial production line systems. New intelligent and interconnected methods (e.g., cooperative robotics, big data analysis, cyber-physical systems) contribute further to the operation efficiency. Recently, sustainability has become a significant question in robotics: modern technical society faces problems such as decreasing availability of natural resources, workforce scarcity, and environmental challenges. This work focuses on industrial robotic systems as a primary pillar for sustainability efforts in numerous production sectors, such as metallurgy, assembly lines, and construction. This paper aims to review and analyze possible sustainability indicators of the industrial applications of robotics. Based on the analysis, the paper presents a manufacturing process model with industrial robots that considers sustainability indicators. This model highlights the relationship between industrial robotization and sustainability from a quantitative and qualitative perspective. The model indicates that energy efficiency and data interconnectivity play a crucial role in the sustainability of industrial processes. The aim of the model is to help identify indicators playing a role in the sustainability of industrial robot-based manufacturing lifecycle and maintenance.

Open Access: Yes

DOI: 10.3303/CET23107014

Hybrid generative–ensemble approach for predicting recycled aggregate concrete strength properties

Milica V. Vasić Paul O. Awoyera Olaolu George Fadugba Majid Movahedi Rad Lenganji Simwanda Udeme Udo Imoh Majid Movahedi Rad Milica V. Vasić Md Azree Othuman Mydin Andi Asiz

Publication Name: Scientific Reports

Publication Date: 2026-12-01

Volume: 16

Issue: 1

Page Range: Unknown

Description:

This study proposes a hybrid generative–ensemble framework to predict key mechanical properties of recycled aggregate concrete from mix proportions. An established database of 112 mixes was used to model compressive strength, split tensile strength, flexural strength, and elastic modulus. To mitigate data scarcity, a conditional variational autoencoder was trained on the training data only and used to generate additional physically plausible input samples, after which seven supervised learning algorithms were trained and compared using cross-validation. Gradient boosting and support vector regression achieved the most accurate and stable predictions across all targets, outperforming baseline linear models and commonly used empirical correlations. Feature-attribution analysis was used to identify the dominant drivers of each property, showing that binder-related variables primarily govern strength, while aggregate-related variables dominate stiffness. The results support practical, data-driven screening of recycled aggregate concrete mixes and provide interpretable guidance for sustainable mix design.

Open Access: Yes

DOI: 10.1038/s41598-026-42598-6

Comparative Seismic Evaluation Across Leading Software: Distinguishing Conventional and Adaptive Pushover Analysis Techniques

Orsolya Kegyes-Brassai Kevin Karanja Kuria

Publication Name: World Conference on Earthquake Engineering Proceedings

Publication Date: 2024-01-01

Volume: 2024

Issue: Unknown

Page Range: Unknown

Description:

The research intends to validate pushover methods through the lens of the incremental dynamic analysis technique. This study will contrast conventional with enhanced pushover strategies, specifically as they are applied to a 2D steel frame, a 3D RC frame, and a reinforced concrete moment-resisting frame structure. For an exhaustive evaluation, state-of-the-art analysis software tools like SAP2000, OpenSees, Etabs, Seismostruct, and AxisVM are to be employed . The aim of the study is to offer insights into how these methodologies fare in predicting the behavior of these structural configurations under varied seismic conditions. Although traditional pushover approaches, such as the Capacity Spectrum Method, Displacement Coefficient Method, and Target Displacement (N2) Method, are appreciated for their simplicity, they also come with inherent limitations. Notably, they tend to overlook the influences of higher modes both horizontally and vertically. To bridge these gaps, the research will explore Adaptive Pushover Analysis (APA), an advanced pushover technique. Given the importance of understanding the seismic behavior of structures, our investigation will focus on how these advanced pushover techniques can be aptly applied to the structural types. We propose an innovative design approach that integrates these advanced pushover analyses with the principles of performance-based seismic design (PBSD). Furthermore, we suggest the inclusion of structural control systems within the realm of pushover analysis. Such systems, engineered to combat external disruptions like seismic events, can significantly mitigate the seismic demands on structures. By modulating the structural response to these external forces, they ensure enhanced safety. Merging these systems with pushover analysis promises a more comprehensive seismic design strategy, making structures more resilient against seismic threats. Once the research concludes, a range of case studies will be deployed to gauge the efficacy of the proposed methodology against traditional pushover tactics. The research's insights will be consolidated and presented in a detailed final report.

Open Access: Yes

DOI: DOI not available

Reversible DC-to-DC converter for a dual voltage automotive system using zero voltage switching technique

Dan V. Nicolae Petre Scortaru Z. Puklus Mihai Cernat

Publication Name: 11th International Conference on Optimization of Electrical and Electronic Equipment Optim 2008

Publication Date: 2008-01-01

Volume: Unknown

Issue: Unknown

Page Range: 251-258

Description:

A novel hysteretic controller for a bi-directional dc-dc converter with ZVS and interleaving for dual voltage systems in automobiles is presented. A variable frequency extended band hysteretic current control method is proposed. In comparison with classical fixed frequency current control PWM, the reverse polarity peak current needed for ZVS operation is kept constant Inductor current ripple decreases with load reduction. Automatic changes in operation between buck and boost modes are accomplished without transient currents. Converter simulations are carried out using Matlab/Simulink platform.

Open Access: Yes

DOI: 10.1109/OPTIM.2008.4602417

Sustainability Opportunities and Barriers at Universities, Development of a Sustainable University Environment

András Torma Eszter Lukács Bálint Filep Péter Németh

Publication Name: Chemical Engineering Transactions

Publication Date: 2023-01-01

Volume: 107

Issue: Unknown

Page Range: 505-510

Description:

Nowadays, one of the most crucial environmental, social, and economic questions is how to build a sustainable future for the following generations. This is a vital challenge because we live in a historical age due to the over-utilization of CO2-intensive technologies. Thanks to this practice, greenhouse gas emission is increasing yearly; biodiversity is decreasing dramatically. It is essential for our environment that universities play a leading role in the actions that can eliminate these adverse effects. This paper introduces the status of the uptake of sustainability-related issues and targets in the Higher Education (HE) sector. It emphasizes the necessity of the comparable evaluation of these activities by introducing current sustainability ranking systems. Some barriers disable the transition to a sustainable working model for universities. The paper identifies these barriers and makes suggestions for eliminating them through the example of Széchenyi István University’s practice and sustainability action plan. The main obstacles to sustainability in the HE sector incorporate budget constraints, resistance to change, lack of planning and focus, lack of applicability, and continuity of actions. The suggested sixteen action points in this paper could support the immediate change in the attitude to sustainability-related topics at operational levels. These suggestions support the attitude formation at each level of the decision-making process.

Open Access: Yes

DOI: 10.3303/CET23107085

Contrasting results and effectiveness of controlled experiments with crowdsourced data in the evaluation of auditory reaction times

Adam Csapo Hunor Nagy Gyorgy Wersenyi

Publication Name: 7th IEEE International Conference on Cognitive Infocommunications Coginfocom 2016 Proceedings

Publication Date: 2017-01-03

Volume: Unknown

Issue: Unknown

Page Range: 421-425

Description:

We developed an application for the Android platform to test reaction times to auditory stimuli on mobile devices. During tests, users were asked to respond as quickly as possible to auditory events provided through headphone playback, and to also identify the directions of those events based on stereo panning. This paper presents a comparative evaluation of data (i.e. response times in seconds and error rates) collected through controlled supervised experiments as opposed to a crowdsourcing based solution. It is demonstrated that in some respects, crowdsourced data and laboratory data show similar results within their own category, but that at the same time a statistical comparison between the two measurement configurations is difficult due to the significant amount of noisy (outlier) data in the crowdsourced case.

Open Access: Yes

DOI: 10.1109/CogInfoCom.2016.7804586

Measuring of the scalar hysteresis characteristic with a controlled flux density using analog and digital integrators

Tamás Ludvig Miklós Kuczmann Zoltán Pólik

Publication Name: Journal of Electrical Engineering

Publication Date: 2007-08-03

Volume: 58

Issue: 4

Page Range: 236-239

Description:

We have managed to build up a computer controlled system using National Instruments Data Acquisition card and National Instruments LabVIEW software package. First, the specimen under test has been simulated by the Jiles-Atherton model, but simulated measurements have been performed using LabVIEW functions. Our main goal now is to control the magnetic flux density during measurement by using a toroidal core with a feedback controller. In this paper, we show the developed procedure which is suitable for measurement of the hysteresis characteristics using analogue and digital integrators, and to control the waveform of the magnetic flux density determined from the induced voltage of the secondary coil wound on a toroidal core. Our experience is that the developed controller is robust. This work is an initial step to the future work on a vector hysteresis measurement system. © 2007 FEI STU.

Open Access: Yes

DOI: DOI not available

Optical torque sensor development

A. Nagy P. Horváth

Publication Name: Recent Advances in Mechatronics 2008 2009

Publication Date: 2009-01-01

Volume: Unknown

Issue: Unknown

Page Range: 91-96

Description:

The purpose of this study is to develop a contactless torque sensor in the mNm range. The applied optical method is based on the birefringe effect of photoelastic materials. The novelty of the modified reflective photoelastic method is the application of a photoelastic tube as a coupling and measuring element between shafts. Change in intensity of polarized light is proportional to the torque to be measured. Basics of operational principle and practical considerations are also discussed.

Open Access: Yes

DOI: 10.1007/978-3-642-05022-0_16