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Authors - 10223
Publications - 6525
Wavelet based fuzzy rule bases in pre-qualification of access networks' wire pairs
Publication Name: IEEE AFRICON Conference
Publication Date: 2015-11-18
Volume: 2015-November
Issue: Unknown
Page Range: Unknown
Description:
Even though the penetration of the fibre optical cables into telecommunication access networks seems to be accelerated, most of the customers are connected to the central office or to the telecommunication nodes by the copper wire pairs of the old telephone network. Until the replacement of the lines, their needs for modern high speed data communications services can be fulfilled by these symmetrical wire pairs. Equipment manufacturers produce equipments of the latest technologies for these networks (e.g. VDSL2), however pre-qualification of wire pairs of access networks is also essential, as the estimation of the performance gives the possibility to optimize the offered ensemble of services for telecommunications service providers. Our previous performance evaluation method based on fuzzy rule bases at discrete values of the insertion loss at 6 characteristic frequencies is improved by wavelet analysis. We have also proved, that the fine structure of the insertion loss spectrum does not play role in the achievable data transfer rate of the lines.
Open Access: Yes
Database management teaching methodology solutions using innovative and flipped classroom methods
Publication Name: Proceedings of the International Symposium on Applied Machine Intelligence and Informatics Sami
Publication Date: 2026-01-01
Volume: Unknown
Issue: 2026
Page Range: 301-306
Description:
One of the main problems in education is that the time available for completing a given task in class is too limited, so that for this or other reasons (e.g., absences), students fall behind and need to catch up, which results in further loss of time. The mirrored classroom method offers a solution to this problem, with the aim of reducing the time needed for catch-up work. This can be achieved by making video or audio recordings of the teaching material, which can then be shared with the students so that anyone can watch them at any time. The great advantage of this method is that it not only allows students to view and practice the given lesson multiple times, but also allows questions that arise during the learning process to be answered much more quickly. In fact, based on the recorded material, students can even create and solve their own practice exercises. In the flipped classroom, everyone can progress at their own pace, which not only allows for catching up, but also for a kind of preparatory work for the next lesson or class. This method serves both catch-up and talent development, as it allows faster or more interested students to solve additional, more complex tasks, while those who progress more slowly have the opportunity to ask questions without holding back the others. Through several practical examples, the article shows how we implemented education using mirrored classrooms and innovative methods during a series of educational and corporate training sessions.
Open Access: Yes
Model-Based development of induction motor control algorithms with modular architecture
Publication Name: Proceedings 2016 IEEE International Power Electronics and Motion Control Conference Pemc 2016
Publication Date: 2016-11-21
Volume: Unknown
Issue: Unknown
Page Range: 133-138
Description:
Development of control algorithms for electrical machines may be a difficult procedure if functional safety, software quality, reusability and expandability come into scope. These properties might be required in both of research and industrial development projects. State of the art methods and tools like model-based design (MBD) and automated code generation may help to meet these requirements. In this paper, MBD methods and a modular, reusable model architecture are presented for implementation of field oriented control (FOC)-based controller software for induction motors.
Open Access: Yes
Model-based control algorithm development of induction machines by using a well-defined model architecture and rapid control prototyping
Publication Name: Electrical Engineering
Publication Date: 2020-09-01
Volume: 102
Issue: 3
Page Range: 1103-1116
Description:
This paper presents a new control algorithm development approach for induction machines by using model-based design and a systematically built model architecture implemented in MATLAB/Simulink. The model architecture follows a three-layer structure, and it is developed according to the principle of functional decomposition and the needs of reusability and expandability. The first model layer consists of elementary model and algorithm components, the second contains a machine simulation model and a field-oriented control (FOC) algorithm, built upon the first layer’s components, and the third realises the executable models by connecting the models and algorithms defined in the second layer. Furthermore, rapid control prototyping (RCP) is discussed as an experimental validation method, and an experimental setup with RCP is also introduced. The application of the presented methods is demonstrated by simulations as well as by experiments, and by using a control algorithm based on FOC as an example.
Open Access: Yes
Perceived fairness in access to higher education in wartime Ukraine: Social inequalities and trust in admission testing
Publication Name: Regional Science Policy and Practice
Publication Date: 2026-09-01
Volume: 18
Issue: 9
Page Range: Unknown
Description:
The accessibility of higher education during wartime is an essential tool for reducing inequality, retaining talent for post-war recovery, and advancing human development. To increase access to higher education amid a deficit in public finances, Ukraine has introduced mandatory Standardised Admission Testing to fairly assess academic achievement and create a level playing field when choosing a speciality and a higher education institution. At the same time, public perception of fairness and equality in university admissions has changed significantly during the war, as our study shows. Its empirical basis is data from a representative national survey conducted in 2021, 2023, and 2025, which included 5123 respondents. As found, young people, both before the full-scale invasion (2021) and during the full-scale war, placed the most trust in national testing, compared to older age groups, including the generation of parents. Besides, regional differences are evident: residents of the West had significantly higher trust in testing in 2021, but trust later increased in the central and eastern regions as well. Across all demographic characteristics, the share of respondents expressing trust increased in 2023 compared to 2021. In 2025, trust decreased significantly. The most consistent differences were observed by age and region, while income and settlement-type differences appeared primarily at the bivariate level or under specific contextual conditions. Thus, higher levels of trust were observed among residents of urban-type settlements and smaller cities, as well as among higher-income groups, although these patterns were not consistent across all models and waves. The results provide partial support for the proposed hypotheses and carry implications for state policies aimed at strengthening equal access to higher education for youth.
Open Access: Yes
Global challenges and the ‘farm to fork’ strategies of the European Green Deal: Blessing or curse
Publication Name: Progress in Agricultural Engineering Sciences
Publication Date: 2024-12-12
Volume: 20
Issue: 1
Page Range: 101-111
Description:
The article evaluates how well the goals of the European Green Deal are justified, especially considering the risks to energy and food security arising from the conflict between Russia and Ukraine. We agree with the objectives of the European Green Agreement as a whole, but whether some of the objectives which feature in the EASAC study can be achieved by 2030 is questionable, and the description of the tools necessary to achieve the objectives is incomplete. Among other things, there is hardly any mention of the role played by precision farming with digitalization, which is a revolutionary change from an ecological and economic point of view, in reducing the use of synthetic inputs, in regenerating the original state of the soil, in reducing GHG emissions, thus in increasing biodiversity, and at the same time in intensifying production, and finally in expanding the application of biotechnology. We examine these areas in our analysis. Some of the objectives of the EASAC study to be achieved by 2030 are subject to debate, and the description of the information and communication conditions necessary to achieve the objectives is incomplete. The IoT (Internet of Things) responds to global and local challenges: it integrates the precision technologies, WSNs (Wireless Sensor Networks), artificial intelligence, mobile field (Smart Small Robots) and remote data loggers (UAVs: Unmanned Air Vehicles and satellites), Big Data, and cloud computing. Consequently, decision support is increasingly developing into unmanned decision making. IoT (Internet of Things) is the basis of “Farm to Fork” and “Lab to Field” monitoring approaches. This article evaluates the implementation of European Green Agreement objectives in light of energy and food security risks arising from the Russia-Ukraine conflict. While overall support for the agreement exists, the feasibility of certain EASAC study objectives by 2030 is called into question due to insufficient tools specifications. Notably absent is the emphasis on precision farming with digitalization, which is a transformative ecological and economic practice. Our analyses look into its function in reducing synthetic inputs, soil regeneration, GHG emission reduction, biodiversity enhancement, production intensification, and biotechnology development. Debates surround EASAC study objectives for 2030, despite limited information and communication restrictions. The Internet of Things (IoT) arises as a solution, combining precision technology, WSNs (wireless sensor networks), AI (artificial intelligence), smart small robots, UAVs (unmanned aerial vehicles), satellites, big data, and cloud computing. As a result, decision support turns toward unmanned decision-making, with IoT laying the groundwork for “Farm to Fork” and “Lab to Field” monitoring systems.
Open Access: Yes
Last reflections to the discussion launched by Kálmán kulcsár on the topic of "modernisation, regime change and the Hungarian reality". the reflexive phase of modernisation clarifying the direction
Publication Name: Tarsadalomkutatas
Publication Date: 2011-03-01
Volume: 29
Issue: 1
Page Range: 15-31
Description:
In Issue 4 of Társadalomkutatás (Social Research) - 2009, the "main rehearsal" of the Delphi debate volume, initially to be edited by Kálmán Kulcsár with Károly Varga's cooperation, chose the debate-launcher out of one of the main range in the senior editor's oeuvre, the theme of modernization. Due to aspects of professional and world-view multilateralness as well as volume limitations, besides Varga's answering article, Kálmán Kulcsár chose from several contributions only the studies of two authors who were able to pronouncedly mark the poles of this spectrum, broad in both its dimensions: from law sociological and progressive directions, he chose Antal Ádám's article, from value conservative and "inter-science" angles, he chose that of Gábor Náray-Szabó. Meanwhile, however, another momentous opponency to Kulcsár's introduction was completed, written by Rezso Lovas, atomic researcher; which, due to the death of the debate's initiator, can only appear in the present Kulcsár-memorial issue of the journal. This is what the present author is trying to respond to, in Kálmán Kulcsár's spirit. He recalls, on the one hand, Kálmán Kulcsár's "thesis", according to which "the modernisation of the decades following World War II can be truly applied as a concept with an explanatory power in understanding current social phenomena and processes"; on the other hand recalling Rezso Lovas's "antithesis" about the rather negative classification of this key concept, according to which "modernisation can no longer be a leading idea any more because it is not clear where it leads to"; and thirdly, recalls Varga's writing which, although not to be taken for a "synthesis", nuances and completes Kulcsár's thesis, as well as refines some of Lovas' suggestions. He states that whereas Kálmán Kulcsár's approach reckons with a basically positive ideal-type of the concept of modernisation, embracing the original idea, the requirements and certain facts of its realization, Rezso Lovas takes note of the dysfunctional concomitant phenomena, which emerge on it according to the laws of parasitism, formulated by Csíkszentmihá lyi, destroying power sources because of malfunctioning regulation. To determine the new direction, he also borrows from Csíkszentmihályi the concept of higher complexity, in which the moments of differentiation and integration have to maintain balance. He demonstrates that this clarified national strategy-building direction of modernization can bring the conceptions of the Delphi-debate-initiator and his powerful opponent closer to each other.
Open Access: Yes
FUZZY LOGIC BASED RAPID VISUAL SCREENING METHODOLOGY FOR STRUCTURAL DAMAGE STATE DETERMINATION OF URM BUILDINGS
Publication Name: World Congress in Computational Mechanics and Eccomas Congress
Publication Date: 2022-01-01
Volume: Unknown
Issue: Unknown
Page Range: Unknown
Description:
Most of the Unreinforced Masonry (URM) buildings are quite old in Europe based on “Building stock inventory to assess seismic vulnerability across Europe” [1] report. Following the earthquakes (Albania, Italy, etc.) that occurred in Europe, it was revealed that masonry buildings are extremely vulnerable. While probabilistic and deterministic approaches are important for examining a small number of buildings, they do not offer the opportunity to examine a large building stock in a short period of time. Rapid Visual Screening (RVS) methods are used to identify building pre- and post-earthquake vulnerability. Several RVS techniques have been presented in literature over last 30 years. Recent earthquakes have highlighted critical necessity of a rapid vulnerability assessment method for pre-earthquake warning, mitigation, preparedness, and post-earthquake damage state assessment of existing buildings. These findings demonstrate the importance of using an accurate RVS technique to inspect buildings. Due to the subjectivity of the screener, these RVS methods contain uncertainty and vagueness. Fuzzy Inference System (FIS) overcomes nonrandom uncertainty and vagueness by considering building characteristics in terms of their degree of truth. This paper introduces a FIS-based S-RVS case implementation and compares FIS-based Soft-RVS (S-RVS) to traditional RVS methods for identifying building damage state taking into account rapid visual assessment reports about damage caused by the 2019 Albania earthquake. To determine the damage states of URM buildings, 40 buildings damaged in the 2019 Albania earthquake were analyzed and processed to use in the applied fuzzy logic mathematical model. Initial findings demonstrate that the site-specific FIS-based S-RVS method is capable of accurately determining the damage states of at least half of the buildings.
Open Access: Yes
Sensitivity to Geometric Detail in Fatigue Simulation of Electronic Components of Vehicles †
Publication Name: Engineering Proceedings
Publication Date: 2024-01-01
Volume: 79
Issue: 1
Page Range: Unknown
Description:
Solder joints strongly determine the lifetime of electronic components subjected to temperature fluctuations. The lifetime predictions obtained by finite element analysis (FEA) are uncertain due to the significant variation in solder geometry. It is unclear how realistic a geometric model is needed for problems of impartial complexity. A balance must be found between modeling effort and simulation accuracy. Six geometric models of the solder joint of a gullwing lead were built with different complexity, from the simplest to the most realistic, including a realistic reference model obtained by the Surface Evolver simulation software. The FEA results considering linear elastic and plastic material models were compared for the different solder geometries. We conclude that manually created solder geometry is a sufficient alternative to physics-based realistic geometries.
Open Access: Yes
