Search in Publications

Found 6414 publications

Artifacts of grid-based electron structure calculations

János Pipek Szilvia Nagy

Publication Name: Chemical Physics Letters

Publication Date: 2008-10-13

Volume: 464

Issue: 1-3

Page Range: 103-106

Description:

Electron structure calculations over equidistant grids represent physical observables by matrices usually chosen as the projection of the corresponding operator in the Schrödinger picture onto the subspace expanded by the basis set of the given grid resolution. It is shown that any matrix representation compatible with the translational symmetry of the lattice suffers from essential difficulties. Especially the momentum and related operators like the kinetic energy show anomalous behavior, moreover, the required canonical commutation relation can never be satisfied. © 2008 Elsevier B.V. All rights reserved.

Open Access: Yes

DOI: 10.1016/j.cplett.2008.08.091

The Transformation of Digital Culture and Learning Habits in Higher Education, Digital Methods and Tools

Mónika Rajcsányi-Molnár Attila Pongracz István András Jozsef Cserko Anikó Benyák 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: 109-113

Description:

The rise of digital culture has fundamentally changed the way people learn in higher education. Online platforms, digital learning materials and various e-Iearning tools have become commonplace, significantly changing traditional learning methods. Access to information for students has never been easier: online courses, interactive videos and webinars allow flexible and personalised learning. At the same time, learners are moving from being passive recipients to active participants, as the use of interactive content and collaborative learning tools becomes more widespread. Digital methods offer new ways of acquiring and processing knowledge. Tools such as virtual reality (VR), artificial intelligence (AI)-based tutors and gamification-enhanced learning systems increase motivation and allow for a more personalised approach to learning materials. Higher education institutions are also increasingly open to innovation, with the introduction of online learning platforms and hybrid teaching models gaining ground. Through this transformation, higher education is no longer limited to classroom learning but is becoming a global process in the digital space. Our article explores these issues using our concrete tacit knowledge and experiences from higher education courses.

Open Access: Yes

DOI: 10.1109/CANDO-EPE65072.2024.10772883

Construction 4.0 organisational level challenges and solutions

Ilona Papp Roland Zsolt Szabó Orsolya Nagy

Publication Name: Sustainability Switzerland

Publication Date: 2021-11-01

Volume: 13

Issue: 21

Page Range: Unknown

Description:

The construction industry (CI) is ancient and has evolved along with humanity, yet it has become increasingly inefficient due to fragmentation, the use of traditional solutions and the lack of innovative technologies and methodologies which are no longer sustainable. The Fourth Industrial Revolution has started to transform this industry, and Construction 4.0 (C4) can advocate this change to become a more efficient cyber-physical ecosystem. However, technology alone will not solve all challenges. While research on C4 focuses mainly on technology, management also plays a key role. We asked experienced company executives for their opinions on the digital transformation in the CI. Research proves that it is not just a technology but primarily a management and strategic challenge.

Open Access: Yes

DOI: 10.3390/su132112321

A concept reduction approach for fuzzy cognitive map models in decision making and management

Miklós F. Hatwágner Adrienn Buruzs Elpiniki I. Papageorgiou Laszlo T. Koczy

Publication Name: Neurocomputing

Publication Date: 2017-04-05

Volume: 232

Issue: Unknown

Page Range: 16-33

Description:

Policy making, strategic planning and management in general are complex decision making tasks, where the formulation of a quantitative mathematical model may be difficult or impossible due to lack of numerical data and dependence on imprecise verbal expressions. For such systems, knowledge representation graphs and cognitive maps are most familiar and often used for modelling complexity and aiding decision making. Fuzzy Cognitive Maps (FCM), as graph-based cognitive models, have been successfully used for knowledge representation and reasoning. In modelling complex systems usually a large number of concepts need to be considered. However, it is often difficult in real applications to find the appropriate number of concepts. Using only a few concepts is not enough to represent the modelled system with the required precision, and increasing the number of concepts increases the complexity of the model quadratically; it is burdensome to work with for the experts. The contribution of this paper is two-fold: (i) to propose a new concept reduction approach for FCM and (ii) to apply it on developing less complex FCM for management and decision making. The behaviour of reduced models is analysed through a number of scenarios with respect to the original complex system. The main idea of the reduction is a clustering based on fuzzy tolerance relations. The new approach is focused on reducing complexity in the modelling process, which provides a more transparent and easy to use model for policy makers. The applicability of the proposed method is demonstrated via literature examples and a solid waste management case study that initiated this research. The results clearly show the advantageous characteristics of the proposed concept reduction method for FCM and its aid in policy making.

Open Access: Yes

DOI: 10.1016/j.neucom.2016.11.060

Sustainability trends in the wine industry: Cognitive biases and methodological insights from a PRISMA review

Boglárka Eisingerné Balassa Agnes Csiba-Herczeg Réka Koteczki

Publication Name: Ecocycles

Publication Date: 2023-01-01

Volume: 9

Issue: 3

Page Range: 90-102

Description:

Sustainability—the characteristic, property, and goal of every responsible, mature, rational, and environmentally sensitive organization—has gained undeniable and incredible traction in the wine industry over the last few decades, influencing wine-making procedures and packaging. Determined actors inside and outside the industry have identified key environmental concerns, such as energy efficiency or recycling, that support promoting a sustainable industry. To explore how sustainability is implemented in the wine sector, we, the authors of this paper, conducted a systematic literature review methodology. The PRISMA model served as our primary criteria for focusing the literature search and was utilized in its execution. Our study analyses thirty scholarly publications, which are categorized according to three primary themes: (1) Wineries and Sustainability; (2) Wineries and Cognitive Biases; and (3) Wineries and Sustainability and Cognitive Biases. The novelty of the study lies in its use of a systematic literature review (SLR) to investigate the complex interaction between wine, cognitive biases, and sustainability with a combined focus. The findings point to the understudied domain of consumers' cognitive biases regarding alternate wine packaging. Our results show that there is potential for improvement in the wine sector in terms of sustainable packaging and the consumer behavior of accepting or rejecting specific packaging options. These areas are considered worthy of future holistic approach investigation because alternative packaging is critical to making the industry more environmentally friendly. Still, if consumers cannot accept and purchase wine thus packaged, such raises further questions. Our study may be helpful to stakeholders in the wine sector as practitioners increasingly seek to incorporate and promote sustainable practices in their operations.

Open Access: Yes

DOI: 10.19040/ecocycles.v9i3.376

Football and Politics in Twentieth-Century Hungary

Róbert Győri Szabó

Publication Name: International Journal of the History of Sport

Publication Date: 2019-02-11

Volume: 36

Issue: 2-3

Page Range: 131-148

Description:

In the eastern part of Europe football has always been in close relationship with the political sphere. As the most popular sport it was always a state affair in this area. In the countries surrounded by enemies and rivals suffering from inferiority complex, politics sometimes tried to use soccer as a means of legitimacy and propaganda. The nationalist political elites tried to exploit the political potentials of football. During the dualistic era (1867–1918) soccer was represented in Hungary as the symbol of cultural superiority especially in contrast to Austria; in the inter-war period it was an expression of symbolizing being European, the wish to belong to Western Europe and an evidence of Hungarians’ greatness in opposition to neighbouring countries. In the hands of totalitarian socialist powers, soccer became an even more important political vehicle in order to prove the superiority of socialism above capitalism, to legitimate dictatorship by exploitation football results as the regime’s own victories, and it could channel the sentiments and passions of the people. During ‘soft dictatorship’ of Kádár-era the political control over football remained unchanged, however influence was rather indirect and less drastic.

Open Access: Yes

DOI: 10.1080/09523367.2019.1629583

Benefit evaluation model for gamified add-ons in business software

Ferenc Erdos Gábor Kallos

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2014-01-01

Volume: 11

Issue: 5

Page Range: 109-124

Description:

Return on IT investment analysis has become a fundamental task of the finance function at corporations, let it be large multinational organizations or small and medium businesses (SME). Besides the cost analysis, the benefit analysis is also an essential component of economic calculations and decisions. Due to complicated profit calculations and estimation methods, the benefit of IT investments is less easily forecast and hence less frequently calculated than their costs. This study focuses on a special innovative type of IT investments, the gamified extensions of business software. Gamification, which refers to the use of game design elements in a non-gaming context, can expect big development in the field of business applications in the near future. Gamification features of business software generally enhance user experience, enabling people to do otherwise boring tasks. In the following we attempt to propose a sophisticated benefit evaluation model based on the hedonic wage model (HWM) and technology acceptance model (TAM) for this special type of IT projects.

Open Access: Yes

DOI: DOI not available

Examination of formability of cast aluminium alloy

Erno Halbritter Ágnes Csizmazia

Publication Name: Materials Science Forum

Publication Date: 2003-01-01

Volume: 414-415

Issue: Unknown

Page Range: 15-20

Description:

Ring upsetting has been used to upset AlSi9Cu3 cast alloy in order to examine formability as well as the effect of deformation. Maier scalar quantity, which characterises the stress state, has been calculated. It is concluded that, from the point of view of maximum deformation, ring upsetting tests are more advantageous than simple upsetting tests.

Open Access: Yes

DOI: 10.4028/www.scientific.net/msf.414-415.15

A Comprehensive Review of the Simulation Methods for Analysis at the Pore-scale

Balázs Vehovszky H. Szűcs Brian Sanders

Publication Name: Periodica Polytechnica Transportation Engineering

Publication Date: 2023-01-01

Volume: 51

Issue: 2

Page Range: 105-116

Description:

Fluid flow through porous material is relevant in different fields of engineering, such as in engine and vehicle development, and can be supported through CFD simulation. Numerical simulations at the pore-scale can be used to replace or reduce expensive laboratory measurements. These methods offer a valuable opportunity to connect the pore-scale properties of the porous material with displacement processes on the continuum-scale. Furthermore, they allow researchers to specify crucial flow properties, e.g., capillary pressure, which are crucial for REV-scale research. Three main methods, direct numerical, pore network modeling, and hybrid approaches, are widely used in order to analyze the pore-scale mechanics of fluid flow behavior through porous materials with CFD simulations. The present comprehensive review demonstrates and highlights the significant advantages, disadvantages, and critical challenges in the pore-scale fluid flow simulations. The main challenges include the characterization of material properties, and up-scaling process from pore to continuum or field-scale.

Open Access: Yes

DOI: 10.3311/PPtr.18452