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Found 6407 publications
Outlines of a Graph-Tensor Based Adaptive Associative Search Model for Internet of Digital Reality Applications
Publication Name: 2022 IEEE 1st International Conference on Internet of Digital Reality Iod 2022
Publication Date: 2022-01-01
Volume: Unknown
Issue: Unknown
Page Range: 49-54
Description:
Internet of Digital Reality (IoD) is a technological vision that promises to radically transform existing digital ecosystems in a way that enables users to access all the content and capabilities - whether physical or digital - relevant to a goal-driven purpose in a highly integrated single environment. In this paper, we focus on a specific challenge that we expect will be crucial in making advances in this field: namely, the challenge of developing an effective search method that is personalized, adaptive and associative. As a possible solution to this challenge, we propose a graph-tensor based information model that incorporates the history of search keywords and inferred associations between them across potentially multiple search dimensions. We provide a brief discussion on why we assume this model to have advantageous properties and provide a short use-case example to motivate further research.
Open Access: Yes
The politics of digital sovereignty and the European Union’s legislation: navigating crises
Publication Name: Frontiers in Political Science
Publication Date: 2025-01-01
Volume: 7
Issue: Unknown
Page Range: Unknown
Description:
In recent years, the resistance of member states to the strengthening of the European Union and its ambition to extend the powers of nation states has become a dominant political element, especially in the countries of the Central and Eastern European region. At the same time, both nation states and the EU are facing a number of global challenges, one of the most significant of which, alongside climate change, is digitalization. At the dawn of the digital age, technological innovation and the free flow of information promised unprecedented opportunities. However, as digital technologies have increasingly permeated all aspects of economic, social and political life, they have created new crises and challenges, particularly with regard to digital sovereignty. This research explores the complex and interdisciplinary nature of digital sovereignty, with a particular focus on the crises that digitalization has triggered and caused. These crises manifest themselves in various forms, including cybersecurity threats, privacy issues and the economic dominance of global technology companies. The European Union’s legislative initiatives, including the Digital Services (DSA), Digital Markets (DMA) and European Media Freedom (EMFA) regulations, as well as the efforts to regulate artificial intelligence, are designed to address the crises inherent in the digital age, while at the same time posing new challenges to the sovereignty and perception of sovereignty of individual states. The research examines the EU’s legislative efforts in navigating the politics of digital crises. It sheds light on the interplay between national self-determination and the EU’s overall regulatory framework, highlighting the ongoing struggle to balance control and cooperation in a rapidly changing digital environment. The analysis will provide a deeper understanding of how digital sovereignty is shaped by and responds to crisis policy, and insights into the future of digital governance in an increasingly interconnected world. It also seeks to assess the extent to which recently introduced EU legislation can be harmonized with the policy objective of strengthening the autonomy of nation states. This is particularly important in the context of the legislation and practices observed in countries with relatively small populations, such as Hungary, Slovakia and the Czech Republic.
Open Access: Yes
Multi-level biharmonic and bi-Helmholtz interpolation with application to the boundary element method
Publication Name: Engineering Analysis with Boundary Elements
Publication Date: 2000-01-01
Volume: 24
Issue: 7-8
Page Range: 559-573
Description:
The scattered data interpolation problem is investigated. Instead of the direct use of radial basis functions, the interpolation function is sought as a solution of a higher order partial differential equation supplied with the interpolation equations as special boundary conditions. In this paper the methods based on the biharmonic and the bi-Helmholtz equations are analyzed. The interpolation problem is reformulated in variational forms. Existence and uniqueness theorems are proved in Sobolev spaces. The approximation properties of this interpolation are also investigated. A representation theorem is proved which shows the similarity to the method of radial basis functions based on the fundamental solution of the applied partial differential operator. To solve the appearing biharmonic/bi-Helmholtz equation, a multi-level method is presented which is based on a quadtree/octtree cell system generated by the interpolation points. It is shown that the overall computational cost of the presented method is much less than that of the traditional method of radial basis functions. The method makes it possible to avoid the solution of large, fully populated and often ill-conditioned systems of linear equations. Finally, some applications to solving partial differential equations are outlined. The biharmonic/bi-Helmholtz interpolation technique immediately defines a grid-free method, but can be combined with the boundary element method as well. A possible application in the dual reciprocity method is also presented.
Open Access: Yes
Emission analysis of liquefied natural gas and diesel heavy-duty trucks using on-board monitoring method
Publication Name: Journal of Ecological Engineering
Publication Date: 2025-01-01
Volume: 26
Issue: 2
Page Range: 258-271
Description:
Environmental protection and the reduction of greenhouse gas (GHG) emissions are becoming top priorities in the mobility sector especially in heavy-duty truck (HDT) sector. In recent years, numerous regulations, targets, and initiatives have been introduced, all of which strongly promote the reduction of carbon-dioxide (CO2 ) emissions, the adoption of eco-friendly alternatives, and the use of renewable energy sources. The study compares CO2 emissions and fuel consumption between conventional diesel and liquefied natural gas (LNG) heavy-duty vehicles (HDVs) from the same original equipment manufacturer (OEM). The research was conducted on multiple levels, with a primary focus on control based on test track measurements. This was preceded by a simulation phase and followed by public road measurement-based validation process. In this study, we used the onboard monitoring (OBM) emission analysis method, a cost-effective and accurate process where data was recorded from the fleet management system (FMS) using controller area network (CAN) messages. The results are presented in several stages from simulation to data validation. Our research represents a unique study in the field of HDVs, as the measurements were conducted on a test track, supported by simulations and public road tests. The results of the project clearly demonstrate that gas technology can contribute to reducing GHG emissions in HDVs, and LNG provides a reliable alternative for long-distance transportation.
Open Access: Yes
Internet of digital reality: Infrastructural background – Part II
Publication Name: Acta Polytechnica Hungarica
Publication Date: 2021-01-01
Volume: 18
Issue: 8
Page Range: 91-104
Description:
Internet of Digital Reality (IoD) is a concept that extends the Internet of Things (IoT) with the management, transmission and harmonization of digital realities. IoD covers aspects of connectivity, accessibility and usability with respect to different cognitive entities present in the digital world, via a confluence of technologies including virtual reality, artificial intelligence and 2D digital environments, in a way that recognizes human factors and cognitive aspects as key issues. Devices, interfaces, and interacting entities can be enabled through IoD to share digital realities and to thereby build a new level of reality, using intelligent connections mostly based on immersive virtual scenarios and multi-modal interactions in both public and private networks. In this paper, we look into the infrastructural requirements of and challenges behind the Internet of Digital Reality, which must be solved in order to deliver a high-quality user experience while keeping the increasing complexity of these networks at bay.
Open Access: Yes
New results on the bee pollination of quince (Cydonia oblonga Mill.)
Publication Name: Acta Horticulturae
Publication Date: 2001-01-01
Volume: 561
Issue: Unknown
Page Range: 243-248
Description:
The research was conducted on 6 cultivars over three consecutive years. Nectar production of quince was found to be small compared to other temperate zone fruit tree species, since quince flowers contained 1.07 - 0.06 mg of nectar on average. Sugar concentration ranged between 21-27 % on average in different years with a range between 9-47.5 %. There was a significant negative correlation between the amount of nectar and its sugar concentration, but no definite difference was established between the ne ctar production of quince cultivars. In spite of this, bee visitation was highly intense about 5.5 bee visits were counted on average at 50 open quince flowers in 10 minutes and about 9.7 flowers out of 50 were visited. This equals about 7 bee visits per flower per day in good weather. Some cultivars tended to be more and less visited by honeybees. Most honeybees tended to collect pollen (51.6 % in average for the 3 years) and usually fewer gathered only nectar (19.9 %), while the rest had a mixed foraging behaviour gathering both (28.5 %). There were slight differences in the foraging behaviour of honeybees on some cultivars, but these differences were not always consequent in consecutive years. Quince is highly sensitive to partial and/or complete limitation of the insect (bee) pollination period. Complete limitation of insect pollination resulted in no yield and partial limitation of the insect pollination period depressed the final set and yield by at least 60-70 % or more. Significant correlation was established between the intensity of honeybee visitation and the consequent yield of quince. As much as 4-5 or 8-10 honeybee visits are needed per day on one flower to achieve the required optimal fruit set that has been declared in the literature to be 20-25 % for quince.
Open Access: Yes
Mirages and Illusions: The Prospects of Hungarian Imperial Ambitions during the Era of Dualism (1867–1918)
Publication Name: Journal on European History of Law
Publication Date: 2025-01-01
Volume: 16
Issue: 2
Page Range: 69-78
Description:
Although the Hungarian political elite recognized that it is the Austro-Hungarian Monarchy which provided the country with a position of great power, from the 1890 s onwards there was a noticeable increase in independent Hungarian expansionist efforts. Among the complex reasons for this were the results of the Hungarian state’s modernization program, the economic development, and the emergence of a new elite of officials and politicians who had been socialised in the institutional system of Dualism, were au fait with the system, and were able to use it. The strengthening of Hungarian positions and the search for opportunities to assert the country’s interests within the common institutional system of Austria-Hungary, a series of economic policy measures, efforts to gain ground economically, mainly in the south-east, and, to a certain extent and in certain points, the goal of creating a Hungarian nation state emerged as means of achieving expansionist goals. Although the political elite could rightly feel that the country’s room for manoeuvre, weight, and ability to assert its interests within the Monarchy had increased, giving rise to a certain optimism, this proved to be a kind of optical illusion. It is true that Hungary’s clout within the Monarchy had increased, but the Austro-Hungarian Monarchy was steadily losing its importance compared to the other great powers, so the Hungarian elite could formulate its ambitious goals as a strengthening element of a weakening Empire.
Open Access: Yes
DOI: DOI not available
The Analysis of Lifecycle and Multi-Criteria Decision-Making for Three-Generation High-Strength Recycled Aggregate Concrete
Publication Name: Chemical Engineering Transactions
Publication Date: 2023-01-01
Volume: 107
Issue: Unknown
Page Range: 229-234
Description:
The paper encompasses a comprehensive analysis of the life cycle of high-strength concrete (HSC), as well as a work on how HSC is made. Recycled concrete aggregate and multi-recycled concrete aggregate were utilized to partially replace natural aggregate (NA) in the production of the HSCs, while fly ash and silica fume were employed in place of cement. Firstly, the fresh state examination included a flow table test and compressive strength was tested at 28, 90, and 180 days. Moreover, the other aspects (cost and environmental life cycle) were considered to fulfill the sustainability of HSC, which might fit many applications in the building industry. The application of multi-criteria decision-making (MCDM) techniques can help in the development of sustainable concrete by identifying the best choice among multiple alternatives. Therefore, life cycle assessment (LCA) and MCDM technique, namely TOPSIS, were employed to select the best concrete mixture regardless of its generation. The output of the LCA is distributed as input for the TOPSIS technique. The results showed that the third generation of concrete, when compared to the first or second generation of recycled concrete, offers a more favorable alternative with acceptable technical performance, lower environmental impact, and less budget.
Open Access: Yes
DOI: 10.3303/CET23107039
Trend Environmental Implications in Pet Food Industry: Focusing on Sustainability Issues
Publication Name: Chemical Engineering Transactions
Publication Date: 2024-01-01
Volume: 114
Issue: Unknown
Page Range: 727-732
Description:
In recent years, many of the 150 pet food companies currently producing pet food in Europe have started to focus on the ethical and local sourcing of raw materials, but there is still a lack of optimisation of the production processes and sustainable sourcing of raw materials. The aim of this research is to describe the steps already taken by pet food manufacturers towards sustainability and to analyse future plans and objectives of the industry in relation to food overproduction and unnecessary waste. The Delphi method was used with a team of experts from two major international European pet food companies to gain insights to identify current aspects and also where we can see room for development. The research shows that there is a huge potential in recycled human food waste used as pet food raw material, while there are currently efforts on packaging and more effective energy consumption. Moving to insect-based pet food could be an even better approach to increase the level of sustainability. The pet food market is becoming increasingly important as a result of economic development and modern social standards, and it is particularly important to pay attention to these aspects related to the production of pet food even more.
Open Access: Yes
DOI: 10.3303/CET24114122
