Search Everything

Tip: Search using "First Name + Last Name", e.g.
János Kiss instead of Kiss János.

Publications - 6374

Context recognition in mobile robots cooperation using fuzzy signature

Claudiu Radu Pozna Áron Ballagi Laszlo T. Koczy

Publication Name: International Conference on Theoretical and Mathematical Foundations of Computer Science 2010 Tmfcs 2010

Publication Date: 2010-12-01

Volume: Unknown

Issue: Unknown

Page Range: 110-115

Description:

Robots cooperation means also to define the commune task. In order to understand their cooperation the robots must have complete knowledge about all possible states of the work or to understand the context by extract useful information from observation. Present paper focus on the second possibility. We propose a strategy of information extraction and context understanding based on an original data structure, the fuzzy signature and on a priori knowledge, the robot codebook. The paper starts by presenting the concept of the fuzzy signature and exemplify the idea of cooperation by context understanding.

Open Access: Yes

DOI: DOI not available

Kornai’s “main line of causality”: The case of socialist Albania and SFR Yugoslavia, with a special focus on their banking sectors’ ownership structure

Eszter Kazinczy

Publication Name: Acta Oeconomica

Publication Date: 2023-11-03

Volume: 73

Issue: Unknown

Page Range: 173-190

Description:

Based on the structure of János Kornai’s ‘main line of causality’, two unique country cases are compared within the former European socialist bloc: Albania and the Socialist Federal Republic of Yugoslavia. The research provides a comparative analysis with an overview of the two countries’ development between World War II and the fall of the socialist regimes. Special attention is paid to the period following the 1970s as the underlying reforms had been implemented in Yugoslavia by then, leading to fundamentally different socialist prototypes. Regarding the differences, the analysis also gives an insight into the structure of the two respective banking systems. Kornai’s ‘main line of causality’ provides the framework for the current research, supplemented by the respective literature. The analysis concludes that despite the fact that all blocks of the causality line differed in the two systems, similar challenges had to be addressed during the transition period. Furthermore, Albania and the successor states of Yugoslavia reflected a range of common characteristics, which implies the relevance of path dependence.

Open Access: Yes

DOI: 10.1556/032.2023.00041

Quantifying Capacity Reductions from Pedestrian Activity at Unsignalized Crosswalks: A Queuing-Based Assessment Across 24 Hungarian Sites

Emese Makó Souvathone Phetoudom

Publication Name: Lecture Notes in Networks and Systems

Publication Date: 2026-01-01

Volume: 1768 LNNS

Issue: Unknown

Page Range: 127-135

Description:

This study applies an approximate queuing framework to analyze pedestrian flow at 24 crosswalks in Hungary. Data on pedestrian and vehicle volumes, crosswalk dimensions, and vehicle speeds were collected. Key parameters such as pedestrian arrival rates, crossing times, and waiting times were estimated using simplified queuing assumptions. The analysis reveals that pedestrian flow and occupancy significantly impact crosswalk capacity, with reductions ranging from 3% to 50%, particularly at locations with high pedestrian volumes and longer crossing durations. Findings highlight the importance of pedestrian flow characteristics in capacity estimation and demonstrate the practicality of this framework for assessing crosswalk performance. This study applies queuing-based flow analysis across multiple real-world sites using low-data, accessible methods. The results provide valuable insights for urban planners seeking to optimize pedestrian safety and improve crosswalk efficiency, emphasizing the need for targeted interventions like signal timing adjustments and crosswalk redesigns. This approach offers a cost-effective tool for preliminary capacity analysis, supporting informed decision-making in urban transportation planning and pedestrian management.

Open Access: Yes

DOI: 10.1007/978-3-032-13898-9_15

Development of comparative investigation method for timing chain wear analysis using oscillating tribometer

Cs Tóth-Nagy Rajmund Kuti J. Rohde-Brandenburger L. Paulovics

Publication Name: Acta Technica Jaurinensis

Publication Date: 2021-11-24

Volume: 14

Issue: 4

Page Range: 406-423

Description:

This paper presents the development of a test procedure to investigate timing chain components under abrasive stress on a tribometer. Engine developers use cost and time expensive engine dynamometer tests to investigate timing chain life expectancy under different conditions. Tribometer tests are fast and cost effective, but these use standardized specimen material and geometry that greatly differ from the original tribological system of the timing chain. Manufacturing specimens from the original chain material using the original technology is complicated; surface quality and hardness properties cannot be guaranteed. The aim of research was to develop a test method for rapid and cost-effective comparison of engine lubricants, timing chain materials or coatings, as well as to assess the wear resistance of the chain to contaminants. Various uncontaminated and carbon black blended lubricants were compared using standard-based ball-on-disc tribometer tests to tribometer tests using actual timing chain components (bush-on-pin test) of a Diesel engine. Lubricants were ranked in terms of coefficient of friction and wear. Results showed that bush-on-pin tests were comparably suitable for testing lubricants when evaluated against standard ball-on-disc tribometer tests.

Open Access: Yes

DOI: 10.14513/actatechjaur.00620

Population genetic features of calving interval of the Limousin beef cattle breed in Hungary

Szabolcs Bene Eszter Szabó Márton Szűcs Judit Márton Ferenc Szabó Péter J. Polgár

Publication Name: Acta Veterinaria Hungarica

Publication Date: 2022-07-06

Volume: 70

Issue: 2

Page Range: 113-120

Description:

Variance, covariance components, heritability, breeding values (BV) and genetic trends in calving interval (CI) of the Limousin population in Hungary were evaluated. A total of 3,008 CI data of 779 cows from three herds in 1996-2016 were processed. For influencing effects GLM method, for population genetic parameters and BV estimation BLUP animal model, for trend analyses linear regression was applied. The average CI obtained was 378.8 ± 3.1 days. The variance distribution components of the phenotype were as follow: age of cow at calving 34.30%, season of calving 26.09%, year of calving 23.00%, sire 7.45%, herd 3.23%, sex of calf 0.33% and type of calving 0.30%. The heritability of CI proved to be low (h2 d = 0.04 ± 0.02 and 0.03 ± 0.02; h2 m = 0.01 ± 0.02). The repeatability was low (R = 0.03 ± 0.02). Based on the phenotypic trend calculation, the CI of cows decreased by an average of 0.60 days per year (R 2 = 0.19; P < 0.05). In case of genetic trend calculation, the average BV of sires in CI increased 0.07 and 0.17 days per year (R 2 = 0.23 and 0.27; P < 0.05).

Open Access: Yes

DOI: 10.1556/004.2022.00008

A qualitative exploration of narratives among problematic exercise experiences

Álvaro Sicilia Manuel Alcaraz-Ibáñez Mark D. Griffiths Attila Szabo

Publication Name: Journal of Behavioral Addictions

Publication Date: 2026-03-01

Volume: 15

Issue: 1

Page Range: 497-508

Description:

Background and Aims: Exercise is recognized as essential for health, but exercise addiction remains a lesser-known phenomenon. Unlike substance addictions, excessive exercise is often celebrated, making it difficult to distinguish between dedication and compulsion. To understand what exercisers perceive as problematic within their exercise context, a qualitative study was conducted investigating personal experiences.MethodsThrough a reflexive thematic analysis, the present study analyzed 153 narratives from individuals who experienced physical, psychological, or emotional problems due to exercise.ResultsFour main themes emerged: (i) The social pressure of a performativity-oriented culture; (ii) Everything seemed to be going well until the injuries appeared; (iii) Time is money: Interpersonal conflicts; and (iv) It is my responsibility: Intrapersonal conflict. The results suggest that a culture of performance provides an interpretive framework that shapes and sustains problematic exercise experiences. Participants internalized performative values, leading to strict demands and fear of failure, resulting in severe injuries in over 70% of cases. In participants' narratives, the forced interruption of activity was associated with the reported emergence of withdrawal symptoms, with health and morality discourses providing the framework for rationalizing their excessive dedication.ConclusionsThese findings suggest that problematic exercise is not an individual issue, but an expression of a broader culture prioritizing performance. These results underscore the importance of shifting toward biopsychosocial interventions that foster identity flexibility and prioritize holistic well-being and enjoyment over performance metrics.

Open Access: Yes

DOI: 10.1556/2006.2025.00526

ENOUGH FROM THE LAMELLA

Andor Wesselényi-Garay

Publication Name: Metszet

Publication Date: 2024-01-01

Volume: 15

Issue: 3

Page Range: 34-41

Description:

I think there is not a Hungarian architect who has not asked themself at least once what Hungarian architecture is. Therefore, what steps can be taken when invited to redevelop the external appearance of an offi- ce in the centre of Pest. How does one achieve an architecture that in- forms a Hungarian identity? Does the choice of employing external lamella wall systems answer this is terms of aesthetic or even contem- porary technological implementation? Or is the lamella something that should be passed over as it reduces a building to being an identity/na- tionality free shell? The intention is acceptable, but at what cost?

Open Access: Yes

DOI: 10.33268/Met.2024.3.4

Sensitivity analysis of tooth microgeometric modifications on vibroacoustic behaviour in helical gears with harmonically distributed variations

Ambrus Zelei Krisztián Horváth

Publication Name: Journal of Physics Conference Series

Publication Date: 2026-01-01

Volume: 3190

Issue: 1

Page Range: Unknown

Description:

The virtual acoustic testing of gear drives has gained growing importance. Fundamentally, the transmission error (TE) is predicted, since it directly affects the vibration and noise characteristics. In this study, the effect of the harmonically distributed tooth microgeometric variations on the TE is investigated via elastic multibody simulations of a helical gear pair. The sensitivity analysis focused on the tip relief, the root relief and the barrelling. The model considered different degrees of linear-, quadratic- and cubic-harmonically distributed variations. The results showed that barrelling with quadratic harmonic micro-geometry had the most significant effect on TE. In addition, if harmonic distributions accidentally coincide in the pairing of the gears, the TE is significantly amplified, leading to a pronounced excitation of the system dynamics.

Open Access: Yes

DOI: 10.1088/1742-6596/3190/1/012005

Recent advances in MPPT techniques for photovoltaic systems: A review of classical (P&O, IC), intelligent (ANN), optimization (PSO) and hybrid (ANN-PSO) methods

Gusztáv Fekete Sumit Pundir Yang Song Abhishek Sharma Tej Singh Jagdish Chandola

Publication Name: Results in Engineering

Publication Date: 2026-03-01

Volume: 29

Issue: Unknown

Page Range: Unknown

Description:

As global energy consumption rises and fossil fuel resources continue to diminish, the use of effective renewable energy technologies becomes increasingly critical. This comprehensive analysis examines maximum power point tracking (MPPT) approaches for solar photovoltaic (PV) installations, evaluating both classical methods, such as perturb and observe and incremental conductance, alongside advanced intelligent approaches, including artificial neural networks (ANNs). The study also explores optimization-based approaches such as particle swarm optimization (PSO) and combined frameworks that integrate ANN with PSO, assessing their effectiveness across different solar irradiance and temperature scenarios. Classical MPPT approaches are known for their ease of implementation; however, they are reported to demonstrate limitations, including slow response times and steady-state oscillations during rapid changes in environmental conditions. In contrast, artificial intelligence and swarm intelligence methodologies show enhanced flexibility, precision, and stable performance across various irradiance conditions. The integration of intelligent algorithms with optimization techniques results in accelerated convergence rates, improved tracking precision, and enhanced stability, consistently maintaining efficiency levels exceeding 99 % while minimizing oscillations. Recent developments in MPPT technology underscore the exceptional adaptability and energy harvesting potential of hybrid methodologies, emphasizing their crucial role in optimizing PV system performance and supporting sustainable power generation.

Open Access: Yes

DOI: 10.1016/j.rineng.2026.109395