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Found 6412 publications

Steering System Modification for Autonomous Test Vehicles and the Measurement of Steering Geometry †

Zoltan Pusztai László Illés Orova Máté Kapocsi

Publication Name: Engineering Proceedings

Publication Date: 2025-01-01

Volume: 113

Issue: 1

Page Range: Unknown

Description:

This study presents the development and implementation of an electronically actuated steering system in a Formula Student Driverless race car, aiming to support autonomous driving capability. A DC motor with a belt-drive mechanism was integrated into the original steering rack assembly without altering its core mechanical characteristics. The research also includes a validation of the steering geometry using both physical measurements and CAD simulations. The objective of this measurement is to determine the steering angle as a function of the steering wheel input angle, ensuring that the resulting data accurately informs vehicle dynamics models such as the kinematic bicycle model. These steps form the basis for closed-loop control integration in the autonomous driving platform.

Open Access: Yes

DOI: 10.3390/engproc2025113067

WAYS OF IMPROVING OF ACTIVE CONTOUR METHODS IN COLON-OSCOPY IMAGE SEGMENTATION

Raneem Ismail Szilvia Nagy

Publication Name: Image Analysis and Stereology

Publication Date: 2022-01-01

Volume: 41

Issue: 1

Page Range: 7-23

Description:

As colonoscopy is the standard screening approach for colorectal polyps, and the first step of the correct classification and the efficient automatic diagnostics is the accurate detection and segmentation of the ex-isting polyps, it is worth researching systematically, how colonoscopy databases are responding to two of the most influential variational segmentation methods, the geodesic and Chan–Vese active contour meth-ods. Due to the quality variation of the colonoscopy databases, pre-processing steps are made. Then, 14 various filtered images are evaluated as different inputs for the active contour methods using the Sørensen–Dice Similarity Coefficient as a performance measurement metric. The effects of the initial mask shape and its size together with the number of iterations, contraction bias and smoothness factor are studied. In gen-eral, the Chan–Vese method showed more efficiency to match the actual contour of the polyp than the geodesic one with an initial mask possibly located within the polyp area. Preprocessing such as reflection removal, background subtraction and mean or median filtering can improve the Sørensen–Dice coefficient by up to 0.5

Open Access: Yes

DOI: 10.5566/ias.2604

Noise, Vibration, and Harshness (NVH) Challenges in Hydrogen Internal Combustion Engine Vehicles

Krisztián Horváth Krisztián Horváth

Publication Name: Energy Science and Engineering

Publication Date: 2026-02-01

Volume: 14

Issue: 2

Page Range: 1067-1080

Description:

This paper presents a state-of-the-art literature review on noise, vibration, and harshness (NVH) in hydrogen-fuelled internal combustion engines. Studies published between 2011 and 2025 were screened, covering fundamental flame physics, test-bench work, and recent prototype vehicles. The review links hydrogen's core properties—high flame speed, wide flammability, low ignition energy, strong diffusivity—to specific NVH outcomes such as rapid pressure rise, knock, back-fire, and block resonance. For each pathway we summarise measured noise levels, vibration signatures, and psycho-acoustic findings. Mitigation methods are then grouped: lean premixing, direct injection, adaptive ignition timing, exhaust tuning, and structural damping. Results show that, with these measures, hydrogen engines can approach the NVH envelope of modern gasoline units. Remaining gaps lie in long-term durability under high-frequency loading and in full-vehicle sound quality. Overall, the review clarifies current knowledge, highlights consistent trends, and points to research still needed for quiet, smooth hydrogen mobility.

Open Access: Yes

DOI: 10.1002/ese3.70400

Effect of Storage Time on the Structure and Mechanical Properties of Starch/Bentonite Nanocomposites

László Lendvai István Sajó József Karger-Kocsis

Publication Name: Starch Staerke

Publication Date: 2019-01-01

Volume: 71

Issue: 1-2

Page Range: Unknown

Description:

Thermoplastic starch (TPS), plasticized with glycerol and water, and its nanocomposites containing up to 7.5 parts per hundred resin (phr) pristine bentonite (BT) are prepared by melt compounding. Effects of the BT reinforcement and storage time on the morphology, water content, and mechanical properties of the related TPS nanocomposites are investigated on compression molded specimens. Morphology change is followed by wide-angle X-ray scattering (WAXS) measurements. The presence of BT increases the rate of transformation from A- to V-type crystalline form. It is also found that BT particles hinders the recrystallization (retrogradation) of TPS. BT becomes intercalated in TPS, which is supported by the water used as additional plasticizer for the compounding of maize starch. According to gravimetric measurements, TPS samples lose part of their water content during retrogradation/aging. Both the incorporation of BT and the time of aging result in increased strength and stiffness, however at the cost of elongation at break. This is associated with enhanced strength and stiffness, which is ascribed to a change (from more to less hydrated) in the interphase. According to scanning electron and atomic force microscopy analysis, the reinforcing BT particles are homogenously dispersed on nano and micron scale within the TPS matrix.

Open Access: Yes

DOI: 10.1002/star.201800123

Analysis of the financing activities of European football leagues

Roman Veynberg Oleg Litvishko Olga Kokoulina Ayaz Aliev Javid Farzaliev Tamás Gyömörei

Publication Name: Economic Annals Xxi

Publication Date: 2021-06-01

Volume: 189

Issue: 5-6

Page Range: 46-56

Description:

In a market economy, effective financial management is one of the most important aspects of the functioning of any company, which plays a connecting role between various areas of its activities and determines the company's position on the market, its competitiveness, prospects for sustainable development and cost growth. In this context, the assessment of the economic efficiency of sports organizations is also relevant, due to the high social significance of the sports industry and its huge popularity among the population. The study selected leagues that use different approaches to the formation and distribution of financial resources in their activities. Thus, the subject of this research is the existing mechanisms for financing the activities of sports subjects. The comparative report of UEFA on club licensing for pre-COVID-19 period was used as an analytical basis for the study. The results obtained during the study showed that with an effective approach to the process of managing financial and economic activities, the professional sports industry can be considered as a promising tool that can generate a significant material and non-material effect on various spheres of public activity, which affects the dynamic economic growth of the industry, as evidenced, in particular, by the performance index of the football leagues of Europe calculated in the work, showing the stable growth of the industry in the pre-COVID-19 period.

Open Access: Yes

DOI: 10.21003/EA.V189-05

Notes on micromorphology of third instar larvae of hypoderma actaeon (Brauer, 1858) and H. diana (brauer, 1858) (oestridae, hypodermatidae)

Béla Húsvéth Miklós Bieber Egri Borisi

Publication Name: Acta Microscopica

Publication Date: 2019-01-01

Volume: 28

Issue: 5

Page Range: 933-937

Description:

2472 3rd instar larvae of warble flies (Hypoderma diana and H. actaeon) were collected from 31 roe deer and 52 red deer shot during hunting in the Szigetköz Region, North-West Hungary in the summer, fall and winter of 2018. A special histological method was used for the first time for the better recognition of the fine inner structure of warble fly 3rd instar larvae on wild ungulates. This is the method used for horse bots larvae and has not been described for this purpose earlier. The histological characteristic features of larvae were examined.

Open Access: Yes

DOI: DOI not available

Supporting the Pedagogical Evaluation of Educational Institutions with the Help of the WTCAi System

Zoltan Szuts Eniko Nagy Karl Eva Gyorgy Molnar

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2024-01-01

Volume: 21

Issue: 3

Page Range: 125-142

Description:

One of the main aims of educational institutions, is to prepare children for further education and successful integration into the workforce. To achieve this, as much as possible, it is necessary to meet the requirements and expectations set by dynamically changing economic and social environments. Research has shown that learner-centered knowledge transfer and a constructive pedagogical approach have proven more effective in achieving all possible learning outcomes than cognitivist learning theory (teacher-centered education). Therefore, pedagogical monitoring and evaluation procedures are necessary and integral parts, of the educational process, with the goal not only being performance evaluation but also improving and supporting the learning process. Then again, a sad characteristic of the current system is that, on the one hand, it needs to support individual learning paths adequately and on the other hand, the validity of measuring tools suffers, due to the generation gap between teachers and children. Therefore, the development of pedagogical monitoring and evaluation processes, should be an integral part of the constant improvement of educational institutions. Consequently, the question arises: How can the pedagogical monitoring and evaluation system be developed, so that individual learning paths are supported and the validity of measurement tools is optimally ensured? In seeking the answer to this question, our research aims to develop a complex evaluation system, supported by artificial intelligence (WTCAi-When The Child Ask with AI), that suggests suitable actions for monitoring and evaluation, for subject teachers.

Open Access: Yes

DOI: 10.12700/APH.21.3.2024.3.9

Speaking up with passion: Voice, leadership, and helping behavior in public organizations

Muhammad Usman Rudresh Pandey Norah Albishri Attila Kurucz Muhammad Usman Yaqin Li

Publication Name: Acta Psychologica

Publication Date: 2026-06-01

Volume: 266

Issue: Unknown

Page Range: Unknown

Description:

Healthcare delivery depends not only on technical expertise but also on the willingness of clinicians to speak up and to support one another in demanding environments. Drawing on Self-Determination Theory, this study explores how prosocial voice fosters helping behavior through the energizing role of work passion, and how ethical leadership shapes this process. Using a three-wave, multi-source design, we obtained 306 matched employee–leader dyads from public hospitals. Structural equation modeling demonstrated that prosocial voice enhanced work passion, which in turn predicted helping behavior. Mediation analysis confirmed the indirect effect, while moderation results revealed that ethical leadership amplified the passion–helping relationship, producing a significant conditional indirect effect. These findings extend theoretical work by positioning passion as a motivational mechanism that explains how voice translates into prosocial outcomes, and by showing that ethical leadership provides the contextual support necessary for this process. These results provide practical guidance for strengthening supportive climates and leadership practices that enable clinicians' discretionary contributions.

Open Access: Yes

DOI: 10.1016/j.actpsy.2026.106699

The Role of Regulatory Sandboxes in FinTech Innovation: A Comparative Case Study of the UK, Singapore, and Hungary

János Kálmán

Publication Name: Fintech

Publication Date: 2025-06-01

Volume: 4

Issue: 2

Page Range: Unknown

Description:

Regulatory sandboxes have emerged as policy instruments designed to support FinTech innovation while maintaining supervisory oversight. By allowing firms to test financial products in controlled environments, sandboxes aim to reduce regulatory uncertainty and facilitate market entry. Despite their growing adoption, empirical evidence of their effectiveness remains limited, particularly in emerging markets. This study explores the impact of regulatory sandboxes on innovation and market access through a qualitative comparative case study of the United Kingdom, Singapore, and Hungary. Drawing on document analysis and thematic coding, the research evaluates sandbox design, regulatory support, and innovation outcomes across the three jurisdictions. Findings show that sandboxes enhance access to funding, accelerate product development, and foster regulator–firm collaboration. While the UK and Singapore benefit from mature ecosystems and structured frameworks, Hungary illustrates sandbox potential in developing markets. The paper contributes to FinTech regulation literature and provides policy recommendations for optimizing sandbox design across varied institutional contexts.

Open Access: Yes

DOI: 10.3390/fintech4020026