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Found 6334 publications

Open-source complex-geometry 3D fluid dynamics for applications with unpredictable heterogeneous dynamic high-performance-computing loads

József Bakosi

Publication Name: Computer Methods in Applied Mechanics and Engineering

Publication Date: 2024-01-05

Volume: 418

Issue: Unknown

Page Range: Unknown

Description:

We discuss the software implementation of a finite element method, intended for the simulation of complex-geometry 3D flows, using hardware resources effectively, including problems with a priori unknown, heterogeneous, and dynamic parallel computational load. Our fundamental choices of data structures, algorithm, and software design specifically target engineering resolution and accuracy requirements. Some of these choices are: unstructured grids (to explicitly resolve complex 3D geometries), tetrahedra-only computational elements (to enable automatic mesh generation), edge-based finite element scheme (to reduce indirect addressing for increased performance), distributed-memory parallel computing paradigm (to enable large problems), and Charm++ (https://charmplusplus.org) as the runtime system (to effectively use computing resources even in the presence of hardware heterogeneities and dynamic application requirements). We discuss aspects of the implementation that enable exercising unique features of the runtime system, e.g., the single Charm++ programming abstraction, overdecomposition, asynchronous execution, latency-hiding parallel communication and computation, task-parallelism, and dynamic load balancing via object migratability. Multiple test problems are used to verify and validate the numerical solutions and computational performance and scalability to high-performance computing environments are discussed. For maximum transparency and reproducibility, and to encourage future research, development, and use, the full source code, together with regression tests and documentation, is publicly available at https://xyst.cc.

Open Access: Yes

DOI: 10.1016/j.cma.2023.116586

Schools of Architects – An Environmental Psychological Study of Architects’ Recalled High School Environment

Andrea Dúll Ferenc Cságoly Krisztina Somogyi

Publication Name: Magyar Pszichologiai Szemle

Publication Date: 2024-01-04

Volume: 78

Issue: 4

Page Range: 563-584

Description:

Background and objectives: The central problem of the research focuses on the significant difference of perception and reception of the built environment among architects and non-architects. The importance of this phenomena lies in the fact that judgement of the environment is primarily not an aesthetic issue, but is also related to a number of issues such as the quality of person-environment fit, well-being, identity, environmental stress and so on. The purpose of the research is to have a nuanced picture of the architect’s profession-specific approach and the general human characteristics in it, in order to have a deep understanding of the double nature of their vision and to enrich the architectural design process leading to a more harmonious person-environment fit in schools. Method: Regarding the difficulties of the reception of late modern and contemporary architecture, a number of international environmental psychological studies were conducted. Based on these, we carried out the qualitative research that fits into the interpretive paradigm. The research deals with recalling the environment experienced by 32 young architects (doctoral students of BME) and interpreting their own high school environment. Using the method of Grounded Theory, the analysis based on images and text leads to the formulation of five grounded theories. Results: In the interviews of the architects, the retrospective recall of their own high school building was not limited to the description of the usual physical characteristics, but was seen as a psychologically rich socio-physical entity and formulated as an autobiographical narrative. Conclusions: Important locations prior to professional training has a great impact on professional life and in the development if their identity. High schools are such important locations, therefore the focus of the architects’ narratives was not restricted to the building, but referred to the rich experience lived at the school. At this level there is a commonality of experience with non-architects. The research offers new colours to the research on the architect’s special point of view, thus pointing in the direction of bridging the communication gap between architects and non-architects.

Open Access: Yes

DOI: 10.1556/0016.2023.00075

A review on the factors of liner collapse in type IV hydrogen storage vessels

Eszter Kókai Dávid István Kis

Publication Name: International Journal of Hydrogen Energy

Publication Date: 2024-01-02

Volume: 50

Issue: Unknown

Page Range: 236-253

Description:

The on-board hydrogen storage of mobile applications is a key area of global industrial transformation to hydrogen technology. The research work provides an overview about the principle of hydrogen fuel cell vehicles, with a focus on the widespread on-board hydrogen storage technologies. In this work, type IV composite pressure vessels in particular are reviewed. The key challenges of polymeric liners are deeply investigated, and liner collapse was identified as a critical failure of type IV vessels. Different factors of liner collapse were categorized and relevant material properties - such as permeability, physical characteristics, and surface properties - were explained in more detail to lay the foundation for further research on high barrier, durable polymeric liner materials.

Open Access: Yes

DOI: 10.1016/j.ijhydene.2023.09.316

ESG factors in M&A in India: Performance and market insights from 2010 to 2023

Laszlo Vasa Vinod Sharma Manoj Panda Pankaj Sharma Manohar Kapse Yogesh Mahajan Pankaj Sharma Pankaj Sharma

Publication Name: Investment Management and Financial Innovations

Publication Date: 2024-01-01

Volume: 21

Issue: 2

Page Range: 310-322

Description:

This study assesses the impact of mergers and acquisitions on Environmental, Social, and Governance (ESG) performance and market value of acquiring companies operating in India. Data were collected and analyzed from 69 M&A announcements from January 2010 to June 2023, sourced from the Bloomberg database. The analysis reveals a positive correlation between the post-merger market value of acquiring firms and their ESG performance, indicating that an improvement in ESG factors is associated with increased market value after mergers. Additionally, a positive correlation was identified between acquiring companies’ post-merger ESG performance and their target firms’ pre-merger ESG performance. This finding suggests that when acquiring a target firm with high ESG performance, the acquirer is likely to experience an improvement in its own post-merger ESG performance. Moreover, both the post-merger market value and ESG performance of the acquirer are likely to improve with the profitability and size of firms but will have a negative impact based on the leverage components of the acquiring firms.

Open Access: Yes

DOI: 10.21511/imfi.21(2).2024.25

Exploring the competitiveness of tourism in Hungary: Recent findings and results

Lóránt Dávid Géza Tóth Ivett Vargánégálicz

Publication Name: Journal of Infrastructure Policy and Development

Publication Date: 2024-01-01

Volume: 8

Issue: 10

Page Range: Unknown

Description:

This research evaluates the regionalization of tourism in Hungary, revealing the breakdown of the national gross domestic product (GDP) of tourism. It also explores the density, spatial variations, and features of these indicators. A multimodal approach is used to evaluate the competitiveness of Hungarian counties, and the distribution of these tourism regions is analyzed using the tourism penetration index. Furthermore, regional GDP is calculated for the whole territory of Hungary. The study identifies significant regional disparities in tourism competitiveness, highlighting Budapest-Central Danube as the most competitive region and Lake Balaton as underperforming despite its potential. The research contributes by providing a detailed regional GDP analysis and emphasizing the need for targeted policy interventions to enhance tourism development across all regions.

Open Access: Yes

DOI: 10.24294/jipd.v8i10.6527

Development of a Diagnostic Procedure for Vehicle’s Built-in Electric Motors †

David Jozsa Marton Jagicza Gabor Laszlo Toth Balázs Baráth

Publication Name: Engineering Proceedings

Publication Date: 2024-01-01

Volume: 79

Issue: 1

Page Range: Unknown

Description:

Electric and hybrid vehicles, similarly to combustion engine ones, can experience malfunctions, yet preventive diagnostics for their electric motors are underdeveloped. While many methods exist for testing electric motors in heavy industry, they are not commonly applied in the vehicle industry. Our study aims to develop a real-time, non-invasive fault detection procedure for electric motors in these vehicles. Previous research has focused on simulations, but our work involves real measurements conducted in a controlled laboratory using a two-axle chassis dyno. We present the hybrid vehicle’s drivetrain, our equipment, and the feasibility of simulated methods, and we also detail the evaluation method used.

Open Access: Yes

DOI: 10.3390/engproc2024079004

Liability of gatekeepers in the DMA regulation

Dominika Borsa Péter Bálint Király

Publication Name: Rechtskultur

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 49-63

Description:

In recent years, the explosive growth of the digital economy and the dominance of technology giants have brought serious challenges. Core platform services operated by global tech companies such as Google, Apple, Facebook and Amazon have many features that open up opportunities for abuse. In response to these processes, the European Union adopted the Digital Markets Regulation (DMA), which aims to promote fair competition and manage market dominance in the digital sphere. At the heart of its provisions are obligations for gatekeepers, i.e. organizations with significant influence on digital markets. Accordingly, the study presents the DMA‘s responsibility issues for gatekeepers.

Open Access: Yes

DOI: DOI not available

The Role and Impact of Digital Transformation in the Development of Professional Teachers' Methodological Culture

Laszlo Kadocsa Gyula Gubán Levente Juhász Gyorgy Molnar

Publication Name: Cando EPE 2024 Proceedings IEEE 7th International Conference and Workshop Obuda on Electrical and Power Engineering

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 171-178

Description:

Today's professional teacher training system includes both professional and pedagogical preparation, the main aim of this training being to further develop the methodological part of the teacher training. In the last three decades, the institutional system and the content of Hungarian VET have been characterised by constant change, significantly influenced by the series of decisions and recommendations on VET in the EU. While continuous structural and content change has updated the VET infrastructure, and modern curricula have been developed, this modernisation has been accompanied by only modest digital and methodological changes. While all the development programmes implemented have made efforts to improve the methodological knowledge of vocational teachers, the results have been less visible in practice. Research on teaching methods and the methodological culture of professional teachers in vocational subjects has been scarcely reported in the professional press. At the same time, the learning environment has changed dramatically over the last decade, and the need for digital education has significantly altered the expectations of teachers in terms of teaching methods. The digital transformation of education is not a digitally-enhanced version of traditional teaching methods, but a new learning environment in terms of approach, requirements, methodology and assessment systems. In our study we want to present an empirical research and its results, as well as new directions for development, which aimed at partially overcoming this methodological gap at the University of Dunaújváros, In this context, we describe in detail the study that was carried out by means of a questionnaire survey and focus group interviews among engineering and vocational students of the institution in 2014 and 2024.

Open Access: Yes

DOI: 10.1109/CANDO-EPE65072.2024.10772873

Hypergraph-based Modeling of Cognitive Dataflow Systems

Adam Csapo Csaba Hajdu

Publication Name: 2024 IEEE 15th International Conference on Cognitive Infocommunications Coginfocom 2024

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 37-42

Description:

Cognitive systems have become widespread in various computer-based applications, from assistants to robotic systems. Although such systems are useful even in their current version, there is a growing need to incorporate semantic information. This paper introduces HyMeKo, a framework for modeling information using hypergraphs, which allows for the creation of multiple relationships between information entities through a LALR(1)-based language. The framework’s primary application contexts are in robotics, cyber-physical systems, and intelligent systems. A key innovation of this work is a transformation method between hypergraph semantic descriptions and e-adjacency tensors. An additional practical result from the implementation of the framework is a hypergraph-based dataflow system, enabling the simultaneous description and execution of dataflow processes. The paper includes a minimal example to compare the compactness of the introduced language with the widespread URDF, to describe a minimal, 2-link system, demonstrating its advantages in terms of conciseness and flexibility.

Open Access: Yes

DOI: 10.1109/CogInfoCom63007.2024.10894728