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Found 6423 publications

Analysis Of The Relation Between Vehicle And Physiological Data

Ágoston Pál Sándor

Publication Name: Transportation Research Procedia

Publication Date: 2025-01-01

Volume: 91

Issue: Unknown

Page Range: 369-376

Description:

Understanding driver behavior and state is crucial for enhancing road safety, yet traditional assessment methods often lack the granularity of real-world dynamics. This paper introduces the Automated Driving Data Analyzer II (ADDA II), an onboard system evolving from a simulator-based tool to a comprehensive platform for real-world driving data acquisition and analysis. Interfacing via the OBD-II port and offering ECU (Engine Control Unit) compatibility (initially validated with Volkswagen Group vehicles), ADDA II is designed for both scientific research and as an accessible end-user product. The system integrates multimodal data streams, including detailed vehicle dynamics, driver physiological responses (e.g., heart rate), and eye-tracking metrics (blinks, fixations), all synchronized to provide a holistic view of the driving task. This paper demonstrates ADDA II’s architecture and analytical capabilities using a representative real-world dataset from a multi-stage driving task. The analysis showcases the system’s ability to characterize driving styles (identifying, for instance, a ‘Conservative’ profile based on smooth control and adaptive behaviors) and reveal patterns indicative of driver state. Key insights are derived from correlating vehicle speed with heart rate to infer variations in physiological arousal and cognitive load across different environments, and by linking heart rate with ocular fixation patterns to understand visual attention strategies under varying demands. Furthermore, ADDA II incorporates functionalities for real-time feedback and warnings, aiming to promote safer, more sustainable driving practices and enhance driver self-awareness. The presented findings underscore ADDA II’s significant potential as a tool for advancing research in driver state monitoring and developing effective driver support applications.

Open Access: Yes

DOI: 10.1016/j.trpro.2025.10.048

Advanced Numerical Simulation of Scour around Bridge Piers: Effects of Pier Geometry and Debris on Scour Depth

Muhanad Al-Jubouri Ethar H. Abbas Richard P. Ray

Publication Name: Journal of Marine Science and Engineering

Publication Date: 2024-09-01

Volume: 12

Issue: 9

Page Range: Unknown

Description:

Investigating different pier shapes and debris Finteractions in scour patterns is vital for understanding the risks to bridge stability. This study investigates the impact of different shapes of pier and debris interactions on scour patterns using numerical simulations with flow-3D and controlled laboratory experiments. The model setup is rigorously calibrated against a physical flume experiment, incorporating a steady-state flow as the initial condition for sediment transport simulations. The Fractional Area/Volume Obstacle Representation (FAVOR) technique and the renormalized group (RNG) turbulence model enhance the simulation’s precision. The numerical results indicate that pier geometry is a critical factor influencing the scour depth. Among the tested shapes, square piers exhibit the most severe scour, with depths reaching 5.8 cm, while lenticular piers show the least scour, with a maximum depth of 2.5 cm. The study also highlights the role of horseshoe, wake, and shear layer vortices in determining scour locations, with varying impacts across different pier shapes. The Q-criterion study identified debris-induced vortex generation and intensification. The debris amount, thickness, and pier diameter (T/Y) significantly affect the scouring patterns. When dealing with high wedge (HW) debris, square piers have the largest scour depth at T/Y = 0.25, while lenticular piers exhibit a lower scour. When debris is present, the scour depth rises at T/Y = 0.5. Depending on the form of the debris, a significant fluctuation of up to 5 cm was reported. There are difficulties in precisely estimating the scour depth under complicated circumstances because of the disparity between numerical simulations and actual data, which varies from 6% for square piers with a debris relative thickness T/Y = 0.25 to 32% for cylindrical piers with T/Y = 0.5. The study demonstrates that while flow-3D simulations align reasonably well with the experimental data under a low debris impact, discrepancies increase with more complex debris interactions and higher submersion depths, particularly for cylindrical piers. The novelty of this work lies in its comprehensive approach to evaluating the effects of different pier shapes and debris interactions on scour patterns, offering new insights into the effectiveness of flow-3D simulations in predicting the scour patterns under varying conditions.

Open Access: Yes

DOI: 10.3390/jmse12091637

Intra- and Interorganizational Barriers to Blockchain Adoption: A General Assessment and Coping Strategies in the Agrifood Industry

Horst Treiblmaier Abderahman Rejeb Mary Lacity Remko van Hoek

Publication Name: Logistics

Publication Date: 2021-12-01

Volume: 5

Issue: 4

Page Range: Unknown

Description:

Background: Companies partaking in modern supply chains face numerous intra- and interorganizational barriers when it comes to the adoption of blockchain technology. Empirical research is missing that explores how exactly these barriers can be overcome. In this paper we first explore barriers that organizations need to overcome to successfully deploy blockchain technology. In a second step, we investigate the agrifood industry and highlight differences in coping strategies between incumbents and start-ups. Methods: We conducted a quantitative survey with 190 supply chain experts to identify barriers and an in-depth qualitative study that included 10 expert interviews to better understand the current situation in agrifood organizations. Results: The findings from the quantitative study show that the most relevant organizational barrier to blockchain adoption is the widespread lack of understanding of the technology and its potential benefits. In the qualitative study we illustrate how various intra- and interorganizational barriers can be overcome and how the resources and capabilities differ between incumbents and start-ups. Conclusions: Our results provide academics with a better understanding of the relevant barriers and bridges of blockchain adoption. Practitioners benefit from learning about the resources and capabilities they need to deploy in order to benefit from blockchain technology.

Open Access: Yes

DOI: 10.3390/logistics5040087

Partial electron beam hardening of cast iron camshafts

Ágnes Csizmazia Miklós Horváth István Oláh Tamás Réti

Publication Name: Materials Science Forum

Publication Date: 2005-01-01

Volume: 473-474

Issue: Unknown

Page Range: 447-452

Description:

In order to improve the local surface properties (hardness, wear and contact fatigue resistance) of cast iron camshafts, detailed experiments with partial electron beam hardening have been performed. It was found that the required case depth of 0.3-0.5 mm and surface hardness of 600-700 HV can be achieved by using appropriately selected, computer-controlled processing parameters (angular speed, specific energy input, beam deflection). © 2005 Trans Tech Publications, Switzerland.

Open Access: Yes

DOI: 10.4028/0-87849-957-1.447

Calculation of the optimal shape of nonconical dies by minimizing necessary forces

Erno Halbritter Gyozo Molnárka

Publication Name: Advances in Engineering Software

Publication Date: 1999-09-15

Volume: 30

Issue: 9-11

Page Range: 735-740

Description:

A mathematical model is given for the metal forming in an axisymmetric nonconical converging die. By using the Maple V system a semianalytical algorithm is proposed for the calculation of the optimal shape of the die which minimizes the consumed energy of the deformation and the power of the friction forces at the wall. Two examples are presented to demonstrate the efficiency of the proposed method. © 1999 Elsevier Science Ltd and Civil-Comp Ltd. All rights reserved.

Open Access: Yes

DOI: 10.1016/S0965-9978(98)00117-3

Analysis of a hidromechanical system's stability with a simple method

Zoltan Varga

Publication Name: Proceedings of the Mini Conference on Vehicle System Dynamics Identification and Anomalies

Publication Date: 1998-12-01

Volume: Unknown

Issue: Unknown

Page Range: 283-294

Description:

Compact built hydraulic power steering with closed center valve is very sensitive for instability. The introduced method divide the nonlinear second order differential equation system into a linear and a non linear part. Applicating the Perron's theorem for the divided equation system it is possible to find such parameter's values which do not make the system instable.

Open Access: Yes

DOI: DOI not available

Enhancing Supply Chain Safety and Security: A Novel AI-Assisted Supplier Selection Method

Adrian Horváth József Pap Judit Bilinovics-Sipos Sándor Remsei Tamás Zelles Csaba Makó Zoltán Baracskai

Publication Name: Decision Making Applications in Management and Engineering

Publication Date: 2025-04-01

Volume: 8

Issue: 1

Page Range: 22-41

Description:

The "Make or Buy" decision and the supplier selection are critical steps for the efficient operation of companies' supply chains. Safety and security are paramount considerations, especially in industries like logistics, where supply chains are vulnerable to external threats and disruptions. In this scientific article, we present a novel Artificial Intelligence (AI)-assisted supplier selection method that significantly enhances the safety and security of suppliers. During our research project, we have created an expert system and a corresponding knowledge base with the relevant rules to support supply chain decision-makers in selecting logistics service providers for warehousing services. The foundation of the AI-assisted supplier selection method is advanced data analytics and the application of expert systems, enabling companies to evaluate potential suppliers in detail from a safety and security perspective. The applied expert systems can identify potential risks and make predictions about supplier performance in the future. In the turbulent environment of the global supply chain, selecting long-term partners like warehousing services providers is critical for the success of the organization. A wrong supplier selection can hardly be reversed in warehousing services, as the cost of change is usually high. The article demonstrates the practical application of the expert system-assisted supplier selection method in a real-world supply chain environment and thoroughly analyzes the achieved results and advantages. The results show that the expert system-assisted method not only increases supplier safety and security but also contributes to improving the efficiency and sustainability of the supply chain. This article provides valuable guidance and solutions for companies looking to enhance their supplier selection using expert system technologies, thereby increasing the safety and security of their supply chains.

Open Access: Yes

DOI: 10.31181/dmame8120251115

The beneficial effect of peppermint (Mentha X Piperita L.) and lemongrass (Melissa officinalis L.) dosage on total antioxidant and polyphenol content during alcoholic fermentation

E. Lakatos Ágnes Nagy Zoltán Molnár V. Kapcsándi Székelyhidi Rita Beatrix Sik Laura Varga

Publication Name: Food Chemistry X

Publication Date: 2022-03-30

Volume: 13

Issue: Unknown

Page Range: Unknown

Description:

Our research aimed to create an herbal fermented alcoholic beverage with high antioxidant and polyphenol content. In this study, continuous sampling was performed throughout the fermentation period, and the changes in total antioxidant (TA) and total polyphenol (TP) contents were determined. After processing the raw material, the prepared herbs were added in 0.5 and 1.0 v/v% concentrations to the samples. The TP content of the control sample was between 1.17 and 1.57 mg/g, and the TA content was 2.12 and 2.54 mg/g during the fermentation process. The lemongrass dosage increased 77.86 % the antioxidant and 70.98 % the polyphenol content by the end of the fermentation process. In the best case, the peppermint dosage increased 72.80 % of the antioxidant content and 72.05 % of the polyphenol content. Overall, fermentation combined with herbs dosage could increase the bioavailability of products made from its polyphenol and antioxidant contents and can be used to develop novel functional foods.

Open Access: Yes

DOI: 10.1016/j.fochx.2022.100226

Performance of CFD codes on CPU/GPU clusters

Manfred Liebmann Zoltán Horváth

Publication Name: Aip Conference Proceedings

Publication Date: 2010-12-01

Volume: 1281

Issue: Unknown

Page Range: 1789-1792

Description:

The paper investigates the scalability of a parallel Euler solver, using the Vijayasundaram method, on CPU and GPU clusters. The aim of this research is to develop efficient parallel CFD codes on unstructured meshes. We present the relevant algorithms and some benchmark results, which show overall efficiency of the solver. © 2010 American Institute of Physics.

Open Access: Yes

DOI: 10.1063/1.3498230