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Publications - 6374

A Nonlinear Computational Framework for Optimizing Steel End-Plate Connections Using the Finite Element Method and Genetic Algorithms

Majid Movahedi Rad Péter Grubits Tamás Balogh

Publication Name: Algorithms

Publication Date: 2025-08-01

Volume: 18

Issue: 8

Page Range: Unknown

Description:

The design of steel connections presents considerable complexity due to their inherently nonlinear behavior, cost constraints, and the necessity to comply with structural design codes. These factors highlight the need for advanced computational algorithms to identify optimal solutions. In this study, a comprehensive computational framework is presented in which the finite element method (FEM) is integrated with a genetic algorithm (GA) to optimize material usage in bolted steel end-plate joints, while structural safety is ensured based on multiple performance criteria. By incorporating both material and geometric nonlinearities, the mechanical response of the connections is accurately captured. The proposed approach is applied to a representative beam-to-column assembly, with numerical results verified against experimental data. By employing the framework, an optimized layout is obtained, yielding a (Formula presented.) improvement in the overall performance objective compared to the best-performing validated model and a (Formula presented.) reduction in material volume relative to the most efficient feasible alternative. Furthermore, a (Formula presented.) decrease in equivalent plastic strain is achieved compared to the configuration exhibiting the highest level of inelastic deformation. These findings demonstrate that the developed method is capable of enhancing design efficiency and precision, underscoring the potential of advanced computational tools in structural engineering applications.

Open Access: Yes

DOI: 10.3390/a18080460

Egysejt-fehérje előállítása állati takarmányozáshoz fermentációs biotechnológiával

Renato Kalocsai Mukhtar H. Ahmed Judit Molnár Dávid Vasas Tamás Szakál

Publication Name: Elelmiszervizsgalati Kozlemenyek

Publication Date: 2022-06-30

Volume: 68

Issue: 2

Page Range: 3888-3895

Description:

No description provided

Open Access: Yes

DOI: 10.52091/EVIK-2022/2-3-HUN

Social Impact Assessment in Urban Security Management Projects: A Case Study from Pakistan

Dávid Fekete Eniko Varga Usman Ghani Peter Toth Zoltán Baracskai

Publication Name: Academic Journal of Interdisciplinary Studies

Publication Date: 2024-01-01

Volume: 13

Issue: 1

Page Range: 33-56

Description:

Public safety and security management projects are devised to reduce crime, fear and calamities by prevailing law and order to reduce the harm in society. In a certain context, social impact assessment is a novel way to reveal the extent of effectiveness for these projects. This case study presents an Expert System based methodology regarding social impact assessment for two urban security management projects in Pakistan. An Expert System, DoctuS is employed as a tool to build a rule-based model tool using social impact attributes (as variables) from literature and expert knowledge (Author’s own insight as being involved in projects). Case-based reasoning (CBR) method is employed for the measurement of the impact of urban security management KPIs (Key Performance Indicators) in the two case projects. The empirical findings in this case study approaches the impact assessment by quantitative analysis of crime rates in JMP statistical package and Qualitative Expert knowledge-based model in DoctuS. Thereby, the study evaluates the pre and post ante project situations in order to assess the project’s effectiveness and impact on improved urban safety and security. In the first step, the projects are briefly described, followed by the crime rate analysis under the project jurisdictions and rules between attributes are defined. The second step defines the qualitative rule-based model along with the two cases described, and validated in DoctuS tool. Some attributes and rules have changed, and a new concise model is presented. The Expert System compares the project cases and evaluates the social impact assessment based on the defined KPIs. The Expert system validation presents a novel model for social impact assessment of subject urban security management projects. We propose this methodology and model as useful in investigating social impact assessment of projects specifically dealing with urban safety and security management. However, the generalizability of the findings of this case-study based articles need more sophisticated tests as recommendation for the extension to this study

Open Access: Yes

DOI: 10.36941/ajis-2024-0004

Detection of Brake Disc Deformation With Adaptive Wavelet Neural Networks

I. Lakatos Péter Kovács Tamás Dózsa Péter Ori Gergo Ungvari Zoltan Szabo Alexandros Soumelidis

Publication Name: IEEE Transactions on Instrumentation and Measurement

Publication Date: 2026-01-01

Volume: 75

Issue: Unknown

Page Range: Unknown

Description:

In this work, we consider the problem of detecting the phenomenon of brake disc runout, which is usually caused by deformations of the brake disc in passenger vehicles. We introduce a novel measurement system that collects and processes information on the vibration profile of the vehicle, as well as the pressure of the brake fluid. Our novel processing method for the collected signals relies on model-driven adaptive wavelet neural networks. We demonstrate that the proposed signal processing methodology outperforms previous approaches to detect aberrations of the brake disc. In addition, the proposed neural network models are defined by interpretable parameters and have reduced complexity when compared to traditional and similar approaches. These characteristics make the proposed construction suitable for automotive applications.

Open Access: Yes

DOI: 10.1109/TIM.2026.3674239

Equivalence of MCDM Methods and Synthesis of Solution Based on Ratings Obtained in Different Models

Dragan Pamucar Irik Z. Mukhametzyanov

Publication Name: Decision Making Applications in Management and Engineering

Publication Date: 2025-01-01

Volume: 8

Issue: 2

Page Range: 1-20

Description:

Synthesis of solutions based on a set of models is a modern trend in the field of multi-criteria choice. It is assumed that a solution based on many methods increases the reliability of the decisions made. One of the important tasks is to select an independent set of models. Comparison of various multi-criteria methods is performed using two lists: rank and rating. To compare the rating of alternatives obtained using different MCDM models, the article uses the Relative Performance Indicator (RPI). Using RPI, six identical methods for aggregating private attributes of alternatives are established: Weighted Sum Model (WSM), Ratio System approach (RS), Multi-Attributive Border Approximation area Comparison (MABAC), Technique for Order Performance by Similarity to Ideal Solution (TOPSIS) with L1 metric, Multi Atributive Ideal-Real Comparative Analysis (MAIRCA) and Ranking of Alternatives with Weights of Criterion (RAWEC) provided that each aggregation method combines the same method of linear normalization of attributes. This allows avoiding duplication of equivalent methods in the Multi-Method Model (3M) approach combining different MCDM models. When solving MCDM problems, it is recommended to use the simplest and most easily interpreted of them: WSM. The presented methodology is recommended as mandatory for the analysis of new or hybrid MCDM methods to eliminate duplication of existing methods. A synthesis of a solution based on ratings obtained in different MCDM models within the 3M approach is proposed. The method includes coordinating the common goal of several models and bringing the ratings obtained in different MCDM models to a common scale, which allows comparing and aggregating the ratings. The resulting rating is more informative than a rating based on ranks, such as Borda rules or similar, since it reflects the real proportions of the effectiveness of alternatives in different models.

Open Access: Yes

DOI: 10.31181/dmame8220251473

Parallels and patterns in the Italian (1901) and Hungarian (1903) legislation on migration

Balázs Pálvölgyi

Publication Name: Comparative Legal History

Publication Date: 2024-01-01

Volume: 12

Issue: 1

Page Range: 51-79

Description:

The second half of the nineteenth century was an era of mass labour migration in Europe, when the Atlantic route became of paramount importance alongside intra-continental mobility. From the last third of the century Italy and Hungary were among the most important emigrating countries. By this time changes in the regulation of migration had begun to take place with the development of stronger state control, which affected mobility and the relationship between emigrants and transporters. The question also arose as to whether and how the large emigrating states could ensure the loyalty of their emigrant citizens and control them en route and in the destination states. The regulatory process which began in the 1880s gradually moved from an administrative approach to the development of more comprehensive legal sources covering more and more aspects of emigration with the Hungarian government making use of foreign solutions, particularly the Italian Emigration Act of 1901.

Open Access: Yes

DOI: 10.1080/2049677X.2024.2349852

Artifacts of grid-based electron structure calculations

János Pipek Szilvia Nagy

Publication Name: Chemical Physics Letters

Publication Date: 2008-10-13

Volume: 464

Issue: 1-3

Page Range: 103-106

Description:

Electron structure calculations over equidistant grids represent physical observables by matrices usually chosen as the projection of the corresponding operator in the Schrödinger picture onto the subspace expanded by the basis set of the given grid resolution. It is shown that any matrix representation compatible with the translational symmetry of the lattice suffers from essential difficulties. Especially the momentum and related operators like the kinetic energy show anomalous behavior, moreover, the required canonical commutation relation can never be satisfied. © 2008 Elsevier B.V. All rights reserved.

Open Access: Yes

DOI: 10.1016/j.cplett.2008.08.091

Sudden deaths of barn swallows (Hirundo rustica) caused by an invading cold front in September 2024 in Hungary

Míra Mándoki János Gál Péter Kertész Árisz Ziszisz Lilla Dénes Dénes Lilla Ziszisz Árisz Viktória Sós-Koroknai Sós Koroknai Viktória Márton Hoitsy Tóth Tamás Zsiborás Luca Kertész Péter Komlós Nikolett Luca Zsiborás Nikolett Komlós Endre Sós Miklós Marosán

Publication Name: Magyar Allatorvosok Lapja

Publication Date: 2025-08-01

Volume: 147

Issue: 8

Page Range: 493-498

Description:

Background: The barn swallow (Hirundo rustica) is a migratory bird with a characteristic color, shiny black on the back, dirty white feathers on the belly, rust-red throat, weighing 17–20 g. This species mainly hunts flying insects, catching them in flight and the swallows are constantly hunting in the air between sunrise and sunset. As the food-scarce autumn season approaches, swallows gather in large flocks and when the daytime temperature drops permanently below 15 ºC, they leave for their wintering grounds in Africa. The birds are preparing for the migration, replenishing their body's fat depots. By the time of leaving, thebirds reach a body weight of 22–25 g, which enables them to travel thousands of kilometers. The metabolism of birds is fast, which is especially noticeable in smaller species. Shortterm starvation is already associated with a significant deterioration in nutritional status. Objectives: The carcasses of the swallows that were still alive at the time of capture, but died during transport were examined to identify to cause of sudden death. Materials and Methods: On September 16, 2024, 34 immobile and flightless swallows were delivered to the Clinic of the Department of Exotic Animal and Wildlife Medicine from the beach in Csopak, Hungary (46° 58′ 10.4″ N, 17° 56′ 13.9″ E). Five randomly selected carcasses of swallows were examined according to the standard pathological methods (dissection, histopathology, special stainings, bacteriological examination, PCR). Results and Discussion: During the dissection the body weight of the swallows delivered to the clinic was 12.0–13.0 g (12.6 g on average) which is around half of the normal bodyweight of these birds before migration. The supplementary examinations were negative for known pathogens and histopathology showed extreme lack of glycogen. According to the weather data from 11th of September 2024, a cyclone with significant cooling and heavy rainfall hit Hungary. The reason behind the death of the swallows was starvation caused by the sudden disappearance of the population of flying insects that could be caught by swallows due to cold and rainy weather. This case draws attention to the dangers of sudden extreme effects of global climate change in the case of some sensitive animal populations.

Open Access: Yes

DOI: 10.56385/magyallorv.2025.08.493-498

Construction 4.0 organisational level challenges and solutions

Ilona Papp Roland Zsolt Szabó Orsolya Nagy

Publication Name: Sustainability Switzerland

Publication Date: 2021-11-01

Volume: 13

Issue: 21

Page Range: Unknown

Description:

The construction industry (CI) is ancient and has evolved along with humanity, yet it has become increasingly inefficient due to fragmentation, the use of traditional solutions and the lack of innovative technologies and methodologies which are no longer sustainable. The Fourth Industrial Revolution has started to transform this industry, and Construction 4.0 (C4) can advocate this change to become a more efficient cyber-physical ecosystem. However, technology alone will not solve all challenges. While research on C4 focuses mainly on technology, management also plays a key role. We asked experienced company executives for their opinions on the digital transformation in the CI. Research proves that it is not just a technology but primarily a management and strategic challenge.

Open Access: Yes

DOI: 10.3390/su132112321