Search in Publications

Found 6334 publications

Analysis of the Aerodynamic Parameters of Road Vehicles Affected by Weather Conditions

István Lakatos Brúnó Péter

Publication Name: Chemical Engineering Transactions

Publication Date: 2024-01-01

Volume: 114

Issue: Unknown

Page Range: 1033-1038

Description:

Optimizing the aerodynamic parameters of road vehicles is essential due to their impact on the environment. It is a special aim of developments, including electric and non-electric vehicles. A lot of research is being conducted according to energy efficiency and range. These parts are the most significant directions of development. Aerodynamic parameters such as drag coefficient exert a significant influence on vehicle energy efficiency. The purpose of this paper is to investigate the aerodynamic parameters of the Ahmed body in rainy weather conditions. Different types of rain and vehicle speeds are studied and compared to each other to examine their effect on the drag coefficient. The examination is carried out using the Computational Fluid Dynamics (CFD) method. In the two-phase simulations, the rain is modeled as solid particles. Results can be used to obtain the most fuel- or electricity-efficient rain type-vehicle speed combinations and thereby can help to contribute a more sustainable transport. The results clearly show that rain has a measurable effect on the drag coefficient. As the rain intensity increases, the drag coefficient increases, too. However, there are uncertainties in the upward trend. As airspeed increases, the increasing trend becomes more stable.

Open Access: Yes

DOI: 10.3303/CET24114173

Advancing Towards Sustainable Retail Supply Chains: AI-Driven Consumer Segmentation in Superstores †

László Buics Golam Sakaline

Publication Name: Engineering Proceedings

Publication Date: 2024-01-01

Volume: 79

Issue: 1

Page Range: Unknown

Description:

Artificial intelligence has revolutionized retail by enhancing business decision-making. This research applies the RFM (Recency, Frequency, Monetary) framework for customer segmentation, promoting sustainable consumer behaviour and eco-friendly products. Mobility issues, such as efficient goods movement and customer access, are also pivotal in sustainable retail supply chains. A systematic literature review (SLR) and Python-based clustering techniques (K-Means, hierarchical, DBSCAN) are employed to analyse a four-year dataset of customer data. The SLR identified six key areas from 71 articles. Clustering results varied: RFM binning found four clusters, K-Means and Mean Shift found three, and hierarchical and DBSCAN found two. The study emphasizes a data-centric retail strategy and the transformative impact of machine learning on customer engagement.

Open Access: Yes

DOI: 10.3390/engproc2024079073

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

Innovation and Technology in the Russo-Ukrainian War

István Lakatos Imre Porkoláb Ferenc Dávid

Publication Name: Connections

Publication Date: 2024-01-01

Volume: 23

Issue: 1

Page Range: Unknown

Description:

Technology and innovation have significantly influenced the Russo-Ukrainian war, impacting not only the armed conflict but also the reconstruction of reclaimed territories and the restoration of services. Few believed in Ukraine’s survival when the Russian invasion began in February 2022. This article examines how Ukraine, through its ability to embrace technological advancements and apply innovative solutions, gained a comparatively advantageous position against Russian aggression. We focus on the fundamental differences in the early stages of the war, particularly highlighting Ukraine’s adept integration of emerging dual-use and advanced Western products and technologies.

Open Access: Yes

DOI: 10.11610/CONNECTIONS.23.1.09

Exploring the Role of Human-Robot Interactions, within the Context of the Effectiveness of a NAO Robot

Eniko Nagy Karl Eva Gyorgy Molnar

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2024-01-01

Volume: 21

Issue: 3

Page Range: 177-190

Description:

The NAO robot has been widely used in various settings, from education and healthcare to entertainment and research. The effectiveness of the robot largely depends on its ability to interact with humans in a meaningful and engaging way. This paper explores the role of human-robot interaction in the effectiveness of the NAO robot. We review the literature on human-robot interaction and highlight the key factors that contribute to successful human-robot interactions. Then we discuss the specific features of the NAO robot that facilitate or hinder effective human-robot interactions. Finally, we present some recent studies that have investigated the impact of human-robot interaction on the effectiveness of the robot in different settings. Overall, our analysis suggests that effective human-robot interaction is essential for the successful implementation of the NAO robot, and that further research is needed to better understand the dynamics of human-robot interaction and its impact on the effectiveness of the robot.

Open Access: Yes

DOI: 10.12700/APH.21.3.2024.3.12

Experimental modal analysis based TPA method of wiper system linkage vibration amplification

Zoltán Gazdagh L. L. Szabo M. Bubreg B. Fukker T. F. Varga

Publication Name: Proceedings of ISMA 2024 International Conference on Noise and Vibration Engineering and Usd 2024 International Conference on Uncertainty in Structural Dynamics

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 3557-3571

Description:

Acoustic transfer functions from mounting points of front wiper systems on vehicle body to driver ear positions can describe vehicle noise transfer properties. Component based TPA methods can be applied to characterize the wiper system as a noise source from the vehicle point of view. The same methods can be utilized to characterize the wiper drive as a noise source from the wiper linkage point of view. The paper presents a method to characterize the transfer properties of the linkage independent from the drive excitation. The linkage amplification method presented here provides force-force transfer functions from drive connection locations to the linkage and mounting point locations of the linkage to the vehicle body. The presented procedure focuses on TPA method within a vehicle component. Synthetized FRFs calculated at drive connection locations and at mounting points of the linkage at measured points of the modal model from experimental modal analysis are used for calculating the linkage amplification functions.

Open Access: Yes

DOI: DOI not available

Consumption Monitoring System for Demand Base Energy Supply Innovation - Prototyping EMAK (Energy Management Data Center) at ZalaZONE

Virag Meszaros Attila Balogh

Publication Name: Chemical Engineering Transactions

Publication Date: 2024-01-01

Volume: 114

Issue: Unknown

Page Range: 865-870

Description:

Witnessing the importance of energy efficiency and sustainability, there is a definite need for modular, standard-component-driven, vendor-independent energy management systems. A system with real-world scenarios capable of driving practical experiences and incorporating AI enhancements would serve as a base for Energy Community platforms that can include even small energy consumers and producers. A multi-year R&D pilot project was established to create a unique Energy Community model using the industrial environment at ZalaZONE, the Hungarian Vehicle Proving Ground in Zalaegerszeg. The main novelty of the project and the study is the unique setup of parallel R&D work from the academic and practitioner's view and the unique data per second of online, real-time data collection methodology and structure. The EMAK platform uses micro transactional data processing enabled to collect, aggregate, and analyse data every second, build more efficient consumption, and balance models with machine learning enhancements. The onsite research includes three buildings (five building parts) with 200 sensors, 5 data aggregators, energy meters, internal and external heat and humidity meters, and weather stations, measuring electricity consumption, heat, humidity, wind, sun radiation, and more environmental data. That network and the backbone software set measure, aggregate, display, and monitor 867 data points, transmitting 8,600,000 data points daily. Although the project lasts till 31st December 2025, the work has already contributed to several key findings within the ecosystem.

Open Access: Yes

DOI: 10.3303/CET24114145

The Connections Between Science and State Decision-Making

Áron Ősze

Publication Name: Rechtskultur

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 451-465

Description:

Science has been and is a fundamentally defining factor in human history. Current achievements in technology, scientific development and the scientific method make it possible to explain, verify on a scientific basis any and all phenomena occurring today. Accordingly, science has a fundamental impact on how society operates. However, the proper functioning of society needs more: normative standards that the government, as public authority, can create (legislation) and implement (law enforcement) through its various governmental bodies. But how does this connect to science and scientific achievements? How do scientific achievements determine or may determine governmental function? In order to even attempt answering these questions, we have to take a detailed look at scientific thinking. In my study, I have prepared a thorough overview of the characteristics of science and scientific thinking, and their interconnections with governmental decision-making.

Open Access: Yes

DOI: DOI not available

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