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Publications - 6383

Cooperation in multiagent systems

Claudiu Radu Pozna Péter Földesi Radu Emil Precup János Kovacs

Publication Name: Sisy 2011 9th International Symposium on Intelligent Systems and Informatics Proceedings

Publication Date: 2011-10-26

Volume: Unknown

Issue: Unknown

Page Range: 195-200

Description:

This paper gives aspects related to a cooperation scenario in the framework of multiagent systems. The presentation is focused on a multiagent system that consists of two agents, the Master and the Apprentice. The theoretical basis of the cooperation scenario is the definition of the most probable process, and two algorithms are used with this regard. The formulation of the cooperation scenario is exemplified for a case study that builds an architecture of successively placed bricks in the workspace. © 2011 IEEE.

Open Access: Yes

DOI: 10.1109/SISY.2011.6034321

Testing the Setup Parameters of 3D Printed Parts Using a 7-axis Measuring Arm

Robert Magai Balazs Molnar

Publication Name: International Journal of Automotive Science and Technology

Publication Date: 2025-12-17

Volume: 9

Issue: 1st Future of Vehicles Conf.

Page Range: 35-40

Description:

Additive manufacturing, particularly Fused Deposition Modeling (FDM), has become a widely adopted technique in prototyping and small-series production. This is primarily due to its high flexibility and cost-effectiveness. However, ensuring dimensional accuracy remains a significant challenge, especially for functional components with tight tolerances. The aim of this study is to investigate the effect of two fundamental FDM parameters, layer height and print speed, on geometric accuracy. Nine configurations were tested by combining three-layer heights (0.1 mm, 0.2 mm, 0.3 mm) with three print speeds (40 mm/s, 60 mm/s, 80 mm/s). The test specimens were printed using an Ultimaker S7 printer with PLA Extrafill filament and subsequently remeasured using a 7-axis Hexagon Absolute Arm coordinate measuring arm. Each part was evaluated at seventeen predefined geometric features, resulting in a total of 153 measurement data points. Deviations were analyzed in comparison with the nominal CAD model values. The results indicate that the combination of 0.2 mm layer height and 60 mm/s print speed (L2S2) yielded the smallest deviations and the most consistent accuracy. Undersizing was typically observed for holes located in the XY-plane, while features along the Z-axis exhibited greater variation. The findings highlight the necessity of coordinated parameter optimization to improve dimensional accuracy.

Open Access: Yes

DOI: 10.30939/ijastech.1753463

Challenges for state regulation of decentralised community platforms

Richard Nemeth Gábor Hulkó Péter Bálint Király Richárd Németh

Publication Name: Rechtskultur

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 249-263

Description:

The rapid rise of decentralized online social networks (DOSNs) introduces a transformative shift in digital communication, moving away from centralized systems and leveraging blockchain technology to ensure user autonomy, data transparency, and resistance to censorship. While these platforms promise significant advantages, such as enhanced privacy, reduced operational costs, and increased interoperability, they also present critical legal and ethical challenges. This study explores these challenges through a multidisciplinary approach, integrating legal analysis, case studies, and theoretical frameworks. Key issues include the tension between immutability and content moderation, the complexities of jurisdiction, and the implications of blockchain splits for accountability and governance. The analysis highlights the need for hybrid solutions that combine decentralized architecture with external oversight, including stricter regulation of hard forks and designated regulatory responsibilities. The findings provide a roadmap for balancing innovation with user protection, aiming to foster sustainable, ethical development of DOSNs while addressing their inherent risks.

Open Access: Yes

DOI: DOI not available

Creation of Slag-Containing Composite Material Prototypes Using Powder Metallurgy Methods

Meruyert E. Utegenova Marzhan Sadenova Petar Sabev Varbanov

Publication Name: Engineering Technology and Applied Science Research

Publication Date: 2025-10-06

Volume: 15

Issue: 5

Page Range: 26555-26563

Description:

This study explores the powder metallurgy methods for obtaining slag-containing composite materials that can be utilized in the ceramic industry, and especially in catalysis, as raw materials for the production of building materials, and also as refractories. The main components of the synthesized samples of composite materials are natural aluminosilicates from the east of Kazakhstan and metallurgical slag of lead production. Varying the content of components in the range: slag 10-30 wt.%, bentonite clay 30-40 wt.%, and natural zeolite 40-60 wt.%, a pilot batch of composite materials was obtained. The results show that the samples had high mechanical strength, ranging from 20.7 to 50.53 MPa, after sintering at a temperature of 1000 °C.

Open Access: Yes

DOI: 10.48084/etasr.11991

Financing support programs for internally displaced persons in Ukraine: Effectiveness and needs alignment

Yuriy Bilan Halyna Mishchuk Natalia Samoliuk Halyna Yurchyk

Publication Name: Public and Municipal Finance

Publication Date: 2025-10-03

Volume: 14

Issue: 3

Page Range: 117-129

Description:

The growing number of internally displaced persons (IDPs), combined with challenges in financing social programs during wartime, highlights the importance of ensuring the effectiveness of public spending. This paper aims to examine the effectiveness of state programs supporting IDPs in terms of their alignment with the target group’s needs. The assessment was conducted based on data from a nationally representative sociological survey of IDPs. The analysis of the effectiveness of the housing assistance program for IDPs was conducted using elasticity coefficients that consider price growth and changes in the subsistence minimum. According to IDPs’ assessment, most programs funded from the state budget meet current needs and are rated above the average level, above 2.5 points out of 5. Programs of legal and informational support (3.8), cash assistance (4.3), access to medical care without restrictions (i.e., the requirement to sign a declaration) (3.4), provision of social housing (3.3), and tax deductions under rental agreements (3.2) are considered highly relevant. Low relevance was assigned to assistance with relocating businesses (1.7), grant support for starting a business (2.2), housing loans (2.2), and vocational training through referrals from the State Employment Service (2.4). Conclusions were drawn about the need for periodic monitoring of IDP needs and analyzing the effectiveness of funding while considering price changes and the subsidence minimum. This approach could be used to support decisions regarding the attraction of alternative sources of financing for social programs when state budget funding is insufficient to cover basic living needs of IDPs.

Open Access: Yes

DOI: 10.21511/pmf.14(3).2025.09

Special problems of interaction between railway track and bridge

Zoltán Major

Publication Name: Pollack Periodica

Publication Date: 2013-08-01

Volume: 8

Issue: 2

Page Range: 97-106

Description:

This paper deals with the phenomenon of track-bridge interaction in railway bridges. Due to the continuity of the rails on the structural expansion joints, the deformations of the deck might induce stresses in the rails that need to be checked. The main design criteria are now specified in Eurocode 1-2.

Open Access: Yes

DOI: 10.1556/Pollack.8.2013.2.11

Casson hybrid nanofluid flow between two rotating disks under magnetic field and convective boundary conditions

Hakeem Ullah Mehreen Fiza Najla A. Mohammed Abdoalrahman S.A. Omer Ali Akgül Ilyas Khan Ibrahim Mahariq Sartaj Aziz Farkhod Rakhmonov

Publication Name: Results in Engineering

Publication Date: 2026-06-01

Volume: 30

Issue: Unknown

Page Range: Unknown

Description:

Nanotechnology plays a vital role in heat transport due to its wide range of applications, significantly contributing to fields such as bioengineering, space exploration, biosensor research, semiconductor technology, and advanced electronics. The primary objective of this analysis is to examine the Casson fluid model for heat and mass transport between stretchy rotating disks, incorporating copper and titanium oxide nanoparticles into a sodium alginate base fluid. This analysis encompasses the effects of mixed convection, chemical reactions, convective conditions, activation energy, and thermal radiation. The bvp4c method is utilized to solve the resultant equations. Tables and Figures offer a clear depiction of the results. Understanding the thermal characteristics of hybrid fluids is crucial to energy systems, biological fluid dynamics, and engineering applications, where fluid flow and heat transfer are critical to system performance. At lower disk, the skin friction improved by 10.24% and 12.36% relative to the higher values of the magnetic and Cason parameters. The Schmidt number reduces mass-transfer gradients by 18.1%, whereas the activation energy decreases by 13.7%. The volume fractions of the selected nanoparticles vary from 0.02 to 0.04, and the heat transfer rates for the hybrid nanofluid increases 12% for the hybrid nanofluid as compared to the nanofluid. The hybrid nanofluid significantly affects flow distributions.

Open Access: Yes

DOI: 10.1016/j.rineng.2026.109979

APPLICATION OF EMISSION FACTORS TO EXPLORE THE POTENTIAL OF HYDROGEN PRODUCTION FROM SEWAGE SLUDGE

Gergely Zoltán Macher Dóra Sipos Judit Pécsinger Dalma Bódizs Éva V. Pestiné Rácz

Publication Name: Iet Conference Proceedings

Publication Date: 2024-01-01

Volume: 2024

Issue: 8

Page Range: 16-24

Description:

The study aims to investigate the possibility of producing hydrogen from sewage sludge obtained during wastewater treatment, using emission factors. It provides an overview of current trends in treating sewage sludge, analyses the potential for generating biogas and hydrogen from sewage sludge, and examines the role of hydrogen in transitioning towards greener energy. The research methodology uses statistical approaches to derive potential values from baseline data through emission factors and categorizes study areas based on this information. The background indicates that biogas-based hydrogen production offers benefits such as utilizing renewable energy sources and reclaiming sewage sludge. There has been a substantial increase in municipal wastewater treatment sludge generation while simultaneously reducing non-hazardous sludge disposal by landfilling. The focus is on utilizing these resources effectively instead of squandering them, while also identifying previously wasted potential over recent years. The primary objective of the paper is to assess the untapped potential that has not been fully utilized in recent years. The research direction was shaped by access to statistical data, albeit constrained by its focus on a typical technological process. The study delves into an increasingly relevant area, with outcomes applicable for policymakers as well as professionals in energy and environmental fields.

Open Access: Yes

DOI: 10.1049/icp.2024.2675

Comparative Study of BASF Ultrafuse 316L and Markforged 17-4PH Stainless Steel Filaments Processed by Fused Filament Fabrication

Eszter Kókai Norbert Simon

Publication Name: International Journal of Automotive Science and Technology

Publication Date: 2025-12-17

Volume: 9

Issue: 1st Future of Vehicles Conf.

Page Range: 77-81

Description:

Metal additive manufacturing is receiving increased attention today, as major industries such as the automotive, aerospace, and medical sectors place a stronger emphasis on it. Among the numerous technologies, fused filament fabrication (FFF) is gaining more focus due to its relatively low equipment cost and ease of application. The production of a solid metal part begins with the extrusion of a metal powder-filled filament, followed by printing, debinding, and heat treatment, through which the final strength is achieved. Among the commercially available filaments, stainless steel–based composites are the most widespread, as they offer good printability, corrosion resistance, and mechanical stability. The two most used materials in this category are BASF Ultrafuse 316L and Markforged 17-4PH alloys. These two materials lend themselves well to comparison, as they are designed for the same manufacturing technology but exhibit different metallurgical behaviors and process requirements, thus providing a comprehensive view of the capabilities and limitations of metal FFF technology. In this study, we aim to demonstrate how these two materials differ in their processing requirements, microstructural evolution, and resulting mechanical performance, and to show what can be achieved when manufacturing metal composites using FFF technology. The main differences between the two filaments are presented in a comparative table to provide a clear and structured overview of their distinct characteristics.

Open Access: Yes

DOI: 10.30939/ijastech.1767208