Search Everything

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

Publications - 6383

Minkowski's inequality based sensitivity analysis of fuzzy signatures

Adam Bukovics Istvan A. Harmati László T. Kóczy

Publication Name: Journal of Artificial Intelligence and Soft Computing Research

Publication Date: 2016-01-01

Volume: 6

Issue: 4

Page Range: 219-229

Description:

Fuzzy signatures were introduced as special tools to describe and handle complex systems without their detailed mathematical models. The input parameters of these systems naturally have uncertainties, due to human activities or lack of precise data. These uncertainties influence the final conclusion or decision about the system. In this paper we discuss the sensitivity of the weigthed general mean aggregation operator to the uncertainty of the input values, then we analyse the sensitivity of fuzzy signatures equipped with these aggregation operators. Finally, we apply our results to a fuzzy signature used in civil enginnering.

Open Access: Yes

DOI: 10.1515/jaiscr-2016-0016

Topography Pre-Treatment of Laser-Textured Surfaces for Friction Simulation in AVL Excite †

András Lajos Nagy Gabor Laki László Boros

Publication Name: Engineering Proceedings

Publication Date: 2024-01-01

Volume: 79

Issue: 1

Page Range: Unknown

Description:

This study presents the challenges arising during the numerical design and simulation of surface-microtextured piston rings. The evaluation of performance is based on the values of asperity and hydrodynamic friction, as well as the lubricant film thickness. The simulation tool AVL Excite Piston & Rings is used to perform the calculations. The aim of this study is to understand how selected surface pre-processing (pre-treatment) steps affect the calculations. Two methods are presented to achieve a realistic surface topography representative of a state after running-in. Pre-treatment is performed through metrological filtering and thresholding of the topography, and Gaussian smoothing of the virtually applied micro-texture array is carried out. The results show the anticipated behavior of decreasing asperity and hydrodynamic friction losses with the concurrent application of both techniques.

Open Access: Yes

DOI: 10.3390/engproc2024079095

Domain-decomposition based H1/2 seminorm preconditioners for frictional contact problems

Lotfi Abdelhakim

Publication Name: Civil Comp Proceedings

Publication Date: 2012-01-01

Volume: 100

Issue: Unknown

Page Range: Unknown

Description:

The bilateral or unilateral contact problem with Coulomb friction between two elastic bodies is considered [1, 12]. An algorithm is introduced to solve the resulting finite element system using a non-overlapping domain decomposition method. This technique enables the transformation of the solution of the global problem to the solution of the elasticity equations for each body separately and the solution of a smaller problem for the contact surface. The solution is obtained by using a successive approximation method, in each step of this algorithm two intermediate problems are solved, the first with prescribed tangential pressure, and the second with prescribed normal pressure[11]. © Civil-Comp Press, 2012.

Open Access: Yes

DOI: DOI not available

Fuzzy Flip-Flop based Neural Networks as a novel implementation possibility of multilayer perceptrons

László Gál Rita Lovassy D. Tóth László T. Kóczy Imre J. Rudas

Publication Name: 2012 IEEE I2mtc International Instrumentation and Measurement Technology Conference Proceedings

Publication Date: 2012-07-30

Volume: Unknown

Issue: Unknown

Page Range: 280-285

Description:

Fuzzy Flip-Flop based Neural Networks (FNN) constructed from fuzzy D flip-flops are studied as a novel technique to implement multilayer perceptrons. The starting point of this approach is the concept of fuzzy flip-flop (F 3), as the extension of the binary counterpart. Fuzzy D flip-flop based neurons are viewed, as sigmoid function generators. Their characteristic equations contain simple fuzzy operations, thus enabling easy implementability. FNNs have an interconnected fuzzy neuron structure composed from a large number of neurons acting in parallel which are capable of learning, and are suitable for function approximation. In this paper we propose the FPGA implementation of ukasiewicz operations, furthermore of fuzzy D flip-flop neurons based on Łukasiewicz norms. © 2012 IEEE.

Open Access: Yes

DOI: 10.1109/I2MTC.2012.6229326

A hybrid discrete bacterial memetic algorithm with simulated annealing for optimization of the flow shop scheduling problem

Olivér Hornyák Károly Nehéz Anita Agárdi László T. Kóczy

Publication Name: Symmetry

Publication Date: 2021-07-01

Volume: 13

Issue: 7

Page Range: Unknown

Description:

This paper deals with the flow shop scheduling problem. To find the optimal solution is an NP-hard problem. The paper reviews some algorithms from the literature and applies a benchmark dataset to evaluate their efficiency. In this research work, the discrete bacterial memetic evolutionary algorithm (DBMEA) as a global searcher was investigated. The proposed algorithm improves the local search by applying the simulated annealing algorithm (SA). This paper presents the experimental results of solving the no-idle flow shop scheduling problem. To compare the proposed algorithm with other researchers’ work, a benchmark problem set was used. The calculated makespan times were compared against the best-known solutions in the literature. The proposed hybrid algorithm has provided better results than methods using genetic algorithm variants, thus it is a major improvement for the memetic algorithm family solving production scheduling problems.

Open Access: Yes

DOI: 10.3390/sym13071131

István Bibó's Political Ten Commandments

István Kukorelli Katalin Szoboszlai-Kiss

Publication Name: Rechtskultur

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 393-404

Description:

This article explores the historical context surrounding István Bibó, widely regarded as the most important Hungarian political thinker of the 20th century, and his analysis of moral publicity. Bibó’s work, The Ten Commandments of the Freedom-Loving Man, became a key text for intellectuals fighting against the communist regime. This text consists of ten statements reflecting important moral principles, as outlined in The Political Ten Commandments of the Freedom-Loving. Bibó wrote this during the Horthy era as a foundational document for a public initiative involving writers and activists associated with the movement. István Bibó clearly valued the moral principles of political ethics. Despite being banned, his text quickly spread through word of mouth, creating a network of intellectuals who resisted the communist regime’s oppression. Notably, this one-page document has yet to be translated into English. In our study, we trace the origins of this significant anti-communist text, written by Bibó, one of Hungary’s most influential political thinkers of the 20th century. The document presents political and moral propositions that remain timeless and relevant.

Open Access: Yes

DOI: DOI not available

CONNECTION BETWEEN TRACK GEOMETRY QUALITY AND DYNAMIC VEHICLE RESPONSE AT VARIOUS SPEEDS

Csaba Ágh

Publication Name: Baltic Journal of Road and Bridge Engineering

Publication Date: 2023-01-01

Volume: 18

Issue: 3

Page Range: 169-187

Description:

Track geometry measurements are widely used for describing track quality. However, derailments and track deterioration are caused by forces arising in vehicle-track system. This research focuses on two types of vehicle response. Firstly, the inf luence of the longitudinal level irregularities on the vertical wheel-rail forces was examined. Secondly, the correlation between the lateral axle box acceleration and the cross level irregularities was investigated. Track geometry and vehicle response data were acquired simultaneously by a track recording car, formed from a passenger car, at various speeds up to 130 km/h. Vehicle-track forces were calculated based on accelerometers mounted on the car body, bogies and axle boxes, considering mass and moment of inertia. Non-linear regressions resulted in vertical vehicle-track force estimation functions. It was proven that the use of second spatial derivatives of the longitudinal level gave a better estimation than the use of reference TQIs according to European Standard EN 13848-6. A linear relationship was found between the speed and standard deviation of vertical vehicle-track forces. On straight sections with constant speed, correlation coefficients of around 0.8 were found between second spatial derivatives of cross level and lateral axle box acceleration.

Open Access: Yes

DOI: 10.7250/bjrbe.2023-18.613

Hard tick infestation of birds of prey (Aves: Accipitriformes, Strigiformes, Falconiformes) in the Western Palearctic: New data and literature review

Calin Gherman Jenő Kontschán Attila D. Sándor Márton Horváth Attila Mórocz Boyan Milchev Tim Warbroek Tijs J.M. van den Bosch Paulina Lesiczka Szilvia Pásztory-Kovács Gergő Keve Andor Pitó Előd Győrig Benedek Juhász Lili Sztrehárszki Sándor Koleszár Nóra Takács Sándor Hornok

Publication Name: Ticks and Tick Borne Diseases

Publication Date: 2026-05-01

Volume: 17

Issue: 3

Page Range: Unknown

Description:

Tick infestation of songbirds has been extensively studied at global and regional scales but relevant data on birds of prey remain scarce and fragmentary. Raptors are of particular epidemiological relevance because their large size, wide-ranging movements and nesting habits may facilitate long-distance dispersal of ticks, and endophilic tick species (e.g. from prey animals) may even persist in their re-used nests. In this study, we aimed to compensate for the lack of comprehensive data in this context. First, more than 1800 birds of prey were examined at 61 sites in Central and South-Eastern Europe, encompassing both continental and Mediterranean climatic regions. Ticks (n = 839) were obtained from 98 birds representing 13 raptor species from three avian orders. Twelve tick species were identified, the most abundant being Rhipicephalus turanicus, Haemaphysalis concinna and Ixodes ricinus. Several previously unknown tick–host associations were revealed. Molecular-phylogenetic analysis showed that sequences of Ixodes arboricola from Tawny Owls (Strix aluco) clustered separately from other conspecific sequences, raising the possibility that Ixodes strigicola Schulze and Schlottke, 1929 is a valid species. Owls proved to be the most heavily tick-infested, particularly Eurasian Eagle-Owl (Bubo bubo) nestlings. Endophilic and rodent-associated tick species were significantly more common on owls and on bird species nesting in cavities or buildings, whereas diurnal raptors were predominantly infested by generalist and exophilic ticks. These patterns highlight the importance of nesting ecology and prey composition in shaping tick assemblages on raptors. The results provide novel insights into tick–raptor associations, contribute new records of tick species from birds of prey, and improve our understanding of the role of raptors in tick maintenance and dispersal which appears to be particularly important in the case of cavity-nesting species. In addition to field sampling, a comprehensive database from nearly 150 published sources revealed that 32 tick species have been reported from birds of prey in the Western Palearctic to date.

Open Access: Yes

DOI: 10.1016/j.ttbdis.2026.102650

Identity and soccer in Corsica

Róbert Győri Szabó

Publication Name: Soccer and Society

Publication Date: 2012-01-01

Volume: 13

Issue: 1

Page Range: 36-55

Description:

For decades Corsica could be characterized as an underdeveloped, politically unstable region ridden with violence. The 'Corsican Question' is a complex phenomenon, created over time as a result of political conflict, social tension and economic maladies. Despite the establishment of administrative autonomy in 1991 and a slow transformation within the French state, coupled with new efforts for institutional reform in order to develop and strengthen Corsica's political autonomy, a successful resolution of conflict in Corsica still remains quite illusory. The most popular sport in the world could be a weapon in the hands of national or ethnic minorities against the majority nation living on the island and against the state ruled by that nation. The Corsican example points up the important connection between football, politics and the question of nations and nationalities across the world. The essay examines how soccer has been used by the Corsican minority as a field of social protest, a stage for demonstrating distinctive identity. Local football is a mirror which reflects the various unresolved questions of the difficult and complex Corsican situation - Corsican identity, relations between the island and the French state, and so on. While Corsican football and the two major Corsican clubs might not ever achieve fame or a strong position in Europe, football will remain one of the most important expressions of Corsican national identity. © 2012 Copyright Taylor and Francis Group, LLC.

Open Access: Yes

DOI: 10.1080/14660970.2012.627166