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Publications - 6278

On critical pounding mechanism of base-isolated buildings using an optimized multi-hazard method

Denise Penelope N. Kontoni Nashwan Adnan Othman Ali Majdi Majid Movahedi Rad Muhannad Riyadh Alasiri Saiful Islam Ataallah Sadeghi-Movahhed

Publication Name: Results in Engineering

Publication Date: 2025-09-01

Volume: 27

Issue: Unknown

Page Range: Unknown

Description:

In many studies on the effect of pounding on isolated structures, the failure to consider all potential pounding scenarios, including floor-to-floor (FF), floor-to-column (FC), and pounding with a moat wall, can introduce uncertainty into the obtained results. Therefore, this study investigates the critical pounding scenarios in isolated structures subjected to seismic excitations. Three primary types of pounding are examined: FF, FC, and MW, under both two-sided and one-sided limitations. Additionally, the study investigates the effects of varying gap sizes and structural heights on the response of structures subjected to each pounding type. In the FF and FC scenarios, six-story and nine-story base-isolated buildings are analyzed in relation to adjacent six-story fixed-base structures. The endurance time method is employed to obtain the seismic responses of the structures. The results indicate that FC pounding consistently induced the highest shear forces in the columns and represented the most critical failure mode. The base-isolated structures that are significantly taller than adjacent fixed-base structures (e.g. 9.6 m) are more susceptible to damage compared to those with similar heights to their neighbors. Furthermore, increasing the gap size can lead to a 100 % rise in inter-story drift under two-sided FF pounding and a 126 % increase in column shear force under two-sided FC pounding.

Open Access: Yes

DOI: 10.1016/j.rineng.2025.106533

Development of a multibody model for go-karts considering frame flexibility

Ambrus Zelei Krisztián Horváth

Publication Name: Pollack Periodica

Publication Date: 2024-10-16

Volume: 19

Issue: 3

Page Range: 66-73

Description:

This study focuses on the optimization dynamics of racing go-karts, which is heavily influenced by the frame's stiffness. Lacking suspensions and differentials, go-karts rely on the frame stiffness for wheel balancing and skid prevention by lifting the inner rear wheel during turns. Utilizing a rigid-flexible model in MSC Software ADAMS View, validated by frame deformation measurements, this research integrates finite element analysis with multibody techniques. The model, leverages computer aided design files for frame geometry and employs finite element analysis for frame validation. It facilitates evaluating go-kart dynamics through simulations, aiding in maneuver testing and design optimization. This approach provides a comprehensive framework for advancing go-kart designs.

Open Access: Yes

DOI: 10.1556/606.2024.01050

Towards 100% Overall Equipment Effectiveness (OEE) at Semi-automatic Assembly Lines – Case Study

Péter Dobra

Publication Name: Springer Proceedings in Mathematics and Statistics

Publication Date: 2021-01-01

Volume: 364

Issue: Unknown

Page Range: 281-289

Description:

In almost all cases, automotive companies and automotive suppliers monitor the efficiency of their production and measure it with different metrics. Based on predefined Key Performance Indicators (KPI’s), the production results of manufacturers show generally definite trends. Higher production efficiency induces higher financial results. Companies typically use Overall Equipment Effectiveness (OEE) to measure and evaluate their production as a gold standard and best practice. In production 100% score of OEE means only good parts (which are accepted by the customer), as fast as possible (based on production plan), without stoppage time. This article is looking for answer to the question how to reach maximum effectiveness and under what circumstances this can be overcome at a hybrid assembly line. Firstly, a literature review demonstrates its scientific relevance. Secondly, an example from the automotive industry illustrates how to perform close to 100% on a semi-automatic assembly line and in which cases it can be exceeded. OEE components, as availability, performance and quality are examined in detail to get excellent percentage. This paper highlights that if the operator performs at the gearbox semi-automatic line above the expected cycle time and with stable entire logistics process, the OEE value may be higher than 100%.

Open Access: Yes

DOI: 10.1007/978-3-030-92604-5_25

Hungary, Hungarian national report on the principle of ne bis in idem

Péter Polt Norbert Kis Balázs Gellér

Publication Name: Revue Internationale De Droit Penal

Publication Date: 2002-01-01

Volume: 73

Issue: 3-4

Page Range: 989-1007

Description:

No description provided

Open Access: Yes

DOI: 10.3917/ridp.733.0989

Will this be the next step? A systematic review of 3D printing in footwear biomechanics

Yaodong Gu Gusztáv Fekete Dong Sun András Kovács Yang Song Zhenghui Lu Xin Li

Publication Name: Footwear Science

Publication Date: 2025-01-01

Volume: 17

Issue: 2

Page Range: 127-142

Description:

Three-dimensional (3D) printing technology enables designers to push the limits of their creativity, creating new possibilities for high-performance footwear. With advancements in engineering and a deeper understanding of biomechanics, researchers have designed footwear with complex structures comprising various materials. These materials and structures exhibit diverse physical properties and are used in physical activity, sports rehabilitation and competitive athletics. This article offers a systematic review of the biomechanical responses to advancements in 3D-printed footwear research from the past decade, focusing on three key domains: injury prevention, comfort, and athletic performance. Current research suggests that adjusting material stiffness or incorporating specific design elements in 3D-printed footwear can modulate plantar pressure distribution, which plays a crucial role in injury prevention, while also enhancing comfort. However, a consensus has yet to be reached regarding the impact of such footwear on athletic performance. Owing to the heterogeneity of research methodologies, the effectiveness of these designs may be significantly influenced by the design specifics, materials used, and individual user differences. Further systematic research and long-term clinical trials are crucial to advancing this field.

Open Access: Yes

DOI: 10.1080/19424280.2025.2472251

EDICAM fast video diagnostic installation on the COMPASS tokamak

M. Berta Sz Tulipán A. Szappanos M. Hron G. Veres R. Pánek S. Zoletnik V. Weinzettl J. Stöckel

Publication Name: Fusion Engineering and Design

Publication Date: 2010-01-01

Volume: 85

Issue: 3-4

Page Range: 370-373

Description:

A new camera system event detection intelligent camera (EDICAM) is being developed by the Hungarian Association and has been installed on the COMPASS tokamak in the Institute of Plasma Physics AS CR in Prague, during February 2009. The standalone system contains a data acquisition PC and a prototype sensor module of EDICAM. Appropriate optical system have been designed and adjusted for the local requirements, and a mechanical holder keeps the camera out of the magnetic field. The fast camera contains a monochrome CMOS sensor with advanced control features and spectral sensitivity in the visible range. A special web based control interface has been implemented using Java spring framework to provide the control features in a graphical user environment. Java native interface (JNI) is used to reach the driver functions and to collect the data stored by direct memory access (DMA). Using a built in real-time streaming server one can see the live video from the camera through any web browser in the intranet. The live video is distributed in a Motion Jpeg format using real-time streaming protocol (RTSP) and a Java applet have been written to show the movie on the client side. The control system contains basic image processing features and the 3D wireframe of the tokamak can be projected to the selected frames. A MatLab interface is also presented with advanced post processing and analysis features to make the raw data available for high level computing programs. In this contribution all the concepts of EDICAM control center and the functions of the distinct software modules are described. © 2009 Elsevier B.V. All rights reserved.

Open Access: Yes

DOI: 10.1016/j.fusengdes.2009.11.001

Tribological investigation of the effect of nanosized CuO and TiO2 on a base oil containing Komad 323 dispersant

I. Szabó Márk Marsicki H. Hargitai

Publication Name: Jurnal Tribologi

Publication Date: 2024-09-01

Volume: 42

Issue: Unknown

Page Range: 103-128

Description:

This article investigates the impact of copper(II) oxide (CuO) and titanium dioxide (TiO2) nanoparticles in Group III base oil with 8 wt% Komad 323 dispersant. Nanoparticles underwent ethyl oleate surface modification. Tribological properties were assessed using a linear oscillating tribometer, continuously monitoring static friction. Friction integral values were derived from extensive data acquisition. Wear analysis employed digital optical and confocal microscopy, complemented by scanning electron microscopy for wear-type characterization and energy-dispersive X-ray spectroscopy for additive quantification in the wear track. Results indicate CuO nanoparticles' poor compatibility with Komad 323, resulting in increased friction (2-13%) and substantial wear reduction (39-50%) at low CuO concentrations (≤0.3 wt%). Higher concentrations (≥0.4 wt%) reduced friction (21-35%) but led to surface fatigue and increased wear rates. Elemental composition analysis of the wear track revealed that the surface contains 1.43-3.17 norm.wt% copper. Conversely, TiO2 in synergy with the dispersant, formed a boundary layer, exhibiting lower friction by 11-14%. TiO2 formed a high wear resistance boundary layer at titanium concentrations of 0.33-0.39 norm.wt%, which resulted in 44% wear volume reduction. Applying both nanoparticles reduced the wear scar diameter of the test specimens by 3-12%.

Open Access: Yes

DOI: DOI not available

Another e-learning method in upper primary school: 3D spaces

Horváth Zsolt Tibor

Publication Name: 9th IEEE International Conference on Cognitive Infocommunications Coginfocom 2018 Proceedings

Publication Date: 2019-02-11

Volume: Unknown

Issue: Unknown

Page Range: 405-408

Description:

Students, especially primary and secondary students spend significantly more time using their smart devices compared to the time they spend preparing for their lessons. Teachers must not only coax students back into studying well, but find up-to-date methods that use smart devices to find success in teaching and to develop skills that are needed in the labour market. 3D spaces provide an exciting technology and can effectively improve those skills. Projects in college education have already confirmed that using these spaces resulted in more effective knowledge but this method can also be great in secondary school education and in primary schools among the generation called Alpha. This article highlights the advantages of the MaxWhere 3D VR spaces in teaching optics as part of the school subject of Physics.

Open Access: Yes

DOI: 10.1109/CogInfoCom.2018.8639937

NREM parasomnia-related behaviors and adverse childhood experiences

Mengesha Srahbzu Biresaw Vivian M. Correa József Vitrai Anna Szűcs

Publication Name: Sleep Medicine

Publication Date: 2024-09-01

Volume: 121

Issue: Unknown

Page Range: 365-369

Description:

Purpose: To assess the prevalence, types, sociodemographic factors, and reported dangerous activities of sleep-related behaviors likely representing NREM parasomnia episodes, as well as their association with adverse childhood experiences in Hungary. Methods: Cross-sectional survey of 1000 adults (aged ≥18 years) representing the Hungarian population, using a non-probability quota sampling with a random walk method and a structured face-to-face interview. A multi-criterion weighting procedure was applied to correct bias along the main sociodemographic variables to the data available. Binary logistic regression estimated the odds of NREM parasomnia-related behaviors associated with sociodemographic factors and adverse childhood experiences. Results: The prevalence of NREM parasomnia-related behaviors was 2.7 %, and self-reported sleep-eating was 0.1 % of the population (4.6 % of parasomnia-like activities). For middle-aged adults, the odds of sleep ambulation were significantly lower than for younger adults (OR 0.3; P = 0.03). A participant's family occurrence of reported parasomnia-like activity increased their odds of having it by more than 7 times (OR 7.1; P < 0.001). Nine participants out of those 27 people reporting NREM parasomnia-related behavior episodes, reported childhood adverse experiences, increasing the odds of parasomnia-related behavior by more than six times (OR 6.2; P < 0.001) compared to those not reporting it. Conclusion: This is the first population survey in Hungary on adult sleep-related behaviors likely representing NREM parasomnia episodes and the potential association with childhood traumatic events preceding them. The related dangerous behaviors call for safety measures and prevention. The significant association between adverse childhood events and NREM parasomnia-related behaviors needs further analysis.

Open Access: Yes

DOI: 10.1016/j.sleep.2024.07.027