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Found 6515 publications

Modelling of virtualized servers

Ákos Kovács G. Lencse

Publication Name: 2015 38th International Conference on Telecommunications and Signal Processing Tsp 2015

Publication Date: 2015-10-09

Volume: Unknown

Issue: Unknown

Page Range: 421-425

Description:

The virtualized systems are one of the key elements of the next generation IT infrastructures. Modeling it will prevent mistakes, and oversized management. Opennebula is one of the most current open source cloud management solutions. Together with Haizea, they are a powerful tool to model and manage a virtualized infrastructure trough the API of Openebula. Haizea has multiple scheduler algorithms that are more effective than that of Opennebula. We performed several experiments to compare simulation and measurement capabilities of Haizea and we highlighted some difference between them which can be reduced if required.

Open Access: Yes

DOI: 10.1109/TSP.2015.7296296

Randomized, double-blind, placebo-controlled, proof-of-concept study of the cortical spreading depression inhibiting agent tonabersat in migraine prophylaxis

M. D. Ferrari P. J. Goadsby J. G. Mills Attila Csanyi J. Olesen

Publication Name: Cephalalgia

Publication Date: 2009-07-01

Volume: 29

Issue: 7

Page Range: 742-750

Description:

Tonabersat is a novel putative migraine prophylactic agent with an unique stereospecific binding site in the brain. Tonabersat has been shown, in animal models, to inhibit experimentally induced cortical spreading depression, the likely underlying mechanism for migraine aura, and cerebrovascular responses to trigeminal nerve stimulation. The aim was to study the potential for tonabersat as a migraine preventive. A randomized, double-blind, placebo-controlled, multicentre, parallel group study recruited patients with migraine with and without aura experiencing between two and six migraine attacks per month. After a 1-month baseline they received tonabersat 20 mg daily for 2 weeks and 40 mg daily for a further 10 weeks. The primary end-point was the change in mean number of migraine headache days between the third month and the baseline period in the intention-to-treat population comparing the placebo (n = 65) and tonabersat (n = 58) groups. At the primary end-point there was a 1.0-day (95% confidence interval -0.33, 2.39; P = 0.14) difference in reduction in migraine days between tonabersat and placebo. There were 10 secondary efficacy end-points, of which two were statistically significant. In month 3 of treatment, the responder rate, defined as a 50% reduction in migraine attacks, was 62% for tonabersat and 45% for placebo (P < 0.05), and the rescue medication use was reduced in the tonabersat group compared with placebo by 1.8 days (P = 0.02). Placebo responses were particularly high for all end-points. At least one treatment-emergent adverse event was reported in the tonabersat group in 61% of patients compared with 51% in the placebo group; none was worrisome. Placebo responses were unexpectedly high in this trial, complicating straightforward interpretation of the study results. The good tolerability and promising efficacy results support further exploration of higher doses of tonabersat in larger controlled trials. © Blackwell Publishing Ltd.

Open Access: Yes

DOI: 10.1111/j.1468-2982.2008.01804.x

Hydrogen Engine Conversion Aspects †

Gábor Sipos László Ádám Sebestyén Kristóf Bukovácz Károly Istvánkó

Publication Name: Engineering Proceedings

Publication Date: 2024-01-01

Volume: 79

Issue: 1

Page Range: Unknown

Description:

The transition from traditional petrol-based combustion engines to hydrogen-powered systems represents a promising advancement in sustainable and clean energy solutions. This review paper explores the intricacies of converting a conventional internal combustion engine to operate on hydrogen gas. Key topics include the performance limitations of hydrogen engines, the role of water injection in combustion modulation, and the investigation of direct injection and port injection systems. This review also examines challenges associated with lean and rich mixtures, risks of backfire and pre-ignition, and the conversion’s overall impact on engine performance and longevity. Additionally, this paper discusses hydrogen lubrication to prevent mechanical wear and addresses emission-related considerations.

Open Access: Yes

DOI: 10.3390/engproc2024079006

The impacts of fintech to the 21st century transaction methods, the fintechized revolution of the letter of credit

Szabó F. Tamás

Publication Name: Rechtskultur

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 617-632

Description:

The article delves into the profound impacts of 21st-century transaction technologies in international trade, specifically with a fintech focus. The study intricately examines how emerging (fintech) technologies like blockchain, artificial intelligence, and digital currencies are reshaping global commerce by facilitating secure and efficient cross-border transactions. The focus will be on the transformative role of fintech in automating and simplifying international trade agreements and promoting trust and transparency between stakeholders. The research’s hypothesis is the fintech products could form an easier way to conclude the international transactions. The paper highlights the impact of these fintech developments on financial systems and their potential to revolutionize traditional banking structures for more inclusive global trade. The publication critically assesses the challenges and regulatory considerations associated with the adoption of fintech in international trade, providing insights into the evolving industrial frameworks governing cross-border transactions. Additionally, it explores how these technologies optimize logistics and inventory processes within supply chain management. The study underscores the fintech-driven potential for enhanced data security and privacy in international trade transactions. Furthermore, it highlights how these fintech innovations empower small and medium enterprises, enabling more active participation in the global trade ecosystem. In conclusion, this publication articulates the transformative and disruptive role of 21st-century fintech transaction technologies as revolutionizing international trade, fostering a more efficient, secure, and inclusive global economic system.

Open Access: Yes

DOI: DOI not available

A Learning Factory Environment for Human–Robot Collaboration-Based Remanufacturing Supported by Artificial Intelligence Solutions

Imre Paniti Zsolt Kemény Mátyás Hajós János Nacsa

Publication Name: Lecture Notes in Networks and Systems

Publication Date: 2025-01-01

Volume: 1546 LNNS

Issue: Unknown

Page Range: 296-303

Description:

In contrast to one-way assembly of products, simple disassembly and more complex remanufacturing present additional challenges and unknowns on several levels, often requiring human capabilities to be combined with machines—thereby becoming a rewarding deployment field for human–robot collaboration, supported by artificial intelligence, advanced planning and extended reality for improved human–machine interrelations. While the industry has realized little benefit of these—still evolving—areas, learning factories can contribute to closing gaps in skills and mindset of future engineers likely to actively shape the aforementioned fields at the time they begin to notably penetrate industrial production. The paper proposes an approach for building up a portfolio of learning factory resources supporting students in acquiring and independently refining knowledge and practice related to collaborative remanufacturing. The paper presents an incremental approach extending manufacturing knowledge to diagnostics and disassembly in collaborative environments, with an outlook on more comprehensive remanufacturing.

Open Access: Yes

DOI: 10.1007/978-3-031-98883-7_36

Investigation of railroad ballast particle breakage

Szabolcs Fischer Erika Juhasz

Publication Name: Pollack Periodica

Publication Date: 2019-01-01

Volume: 14

Issue: 2

Page Range: 3-14

Description:

This paper summarizes the authors up-to-date results in the research topic of railway ballast particles breakage test with individual laboratory test. In the past few years there were a lot of railway rehabilitation and maintenance project in Hungary, as well as abroad. The largest part of worlds railways has traditional superstructure, i.e. they are so called ballasted tracks. The railway ballast is the highest mass in the railways superstructure. Nowadays, it is a naturally fact that there is enough quantity of railway ballast in adequate quality. However, due to the modifications and restrictions in the related regulations since 2010, there are only few quarries in Hungary, which are able to ensure adequate railway ballast material for railway construction and maintenance projects for speed values between 120 and 160 km/h. Quarrying industry is stricken by aggravated environmental, heritage and conservation regulations year by year, it limits the accessibility of mineral wealth in significant manner. This fact with quality requirements means supply and quality risk in production of railway ballast in medium term. The main goal of authors research is to be able to simulate the stress-strain effect of ballast particles in real and objective manner in laboratory circumstances, as well as in discrete element method modeling. This paper introduces the exact assembly of executed laboratory test and newest test results. The authors summarize the up-to-date international literature review, using that they give short outlook to the planned research with research directions in near future.

Open Access: Yes

DOI: 10.1556/606.2019.14.2.1

Challenges for state regulation of decentralised community platforms

Richard Nemeth Gábor Hulkó Péter Bálint Király Richárd Németh

Publication Name: Rechtskultur

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 249-263

Description:

The rapid rise of decentralized online social networks (DOSNs) introduces a transformative shift in digital communication, moving away from centralized systems and leveraging blockchain technology to ensure user autonomy, data transparency, and resistance to censorship. While these platforms promise significant advantages, such as enhanced privacy, reduced operational costs, and increased interoperability, they also present critical legal and ethical challenges. This study explores these challenges through a multidisciplinary approach, integrating legal analysis, case studies, and theoretical frameworks. Key issues include the tension between immutability and content moderation, the complexities of jurisdiction, and the implications of blockchain splits for accountability and governance. The analysis highlights the need for hybrid solutions that combine decentralized architecture with external oversight, including stricter regulation of hard forks and designated regulatory responsibilities. The findings provide a roadmap for balancing innovation with user protection, aiming to foster sustainable, ethical development of DOSNs while addressing their inherent risks.

Open Access: Yes

DOI: DOI not available

Biomolecule composition and draft genome of a novel, high-lipid producing Scenedesmaceae microalga

Péter Bálint Gergely Maróti Prateek Shetty Eszter Badics Norbert Incze V. Soós Vince Ördög E. Balázs

Publication Name: Algal Research

Publication Date: 2021-04-01

Volume: 54

Issue: Unknown

Page Range: Unknown

Description:

Lipid biosynthesis in microalgae can be stimulated by cultivation in low nitrogen medium. MACC-401 was isolated from the soil surface in Tres Marias (MG-Brazil). The strain shows the morphological characteristics of the Scenedesmaceae green algae. The daily biomass and lipid production of MACC-401 is remarkable, 0.36 g L−1 and 110 mg L−1, respectively. Exploration of the genetic background of this promising strain not only allows the utilization of this species for industrial-scale lipid production, but also provides genetic targets to select lipid-producing strains from microalgae collections. We conducted physiological experiments by cultivating MACC-401 in complete and N-limited media and performed genome sequencing as well as transcriptome analysis. The estimated nuclear genome size of MACC-401 is 99.503 Mbp and the chloroplast genome is 0.15 Mbp. The phylogenetic analysis confirmed that the MACC-401 belongs to the Scenedesmaceae family, and represents a genetically distinct accession in this family. A basic comparative transcriptome analysis resulted in the identification of N-starvation responsive genes, which could serve as markers to monitor the onset of lipid accumulation in algal cultures.

Open Access: Yes

DOI: 10.1016/j.algal.2020.102181

Extended fuzzy signature based model for qualification of residential buildings

Ádám Bukovics Gergő Fogarasi Laszlo T. Koczy

Publication Name: Studies in Computational Intelligence

Publication Date: 2020-01-01

Volume: 819

Issue: Unknown

Page Range: 91-97

Description:

Residential buildings can be qualified and ranked based on many viewpoints. For the intervening decision-supporting survey of old residential buildings in the course of our former researches we have created a fuzzy signature based model which defines status evaluation and ranking of buildings on the basis of the condition of load-bearing structures and other building structures. We have extended and changed this model in a way so that it should take into account other viewpoints, too, which, in addition to the load bearing viewpoints strongly influence the manner of intervening. Since in addition to the importance of the given structure the relevance of the building structures of residential buildings are determined also by their quantities and other features, in our case it was necessary to determine relative and absolute relevance weights. We use a structure of fuzzy signature with variable aggregations, where the definition of aggregations is made by parameters, and the value of parameters are changing depending on the specific application, which follow the changes of relevance of given subtrees. The developed method is examined on the basis of a database for which we were used status evaluating expert reports relating to real stock of residential buildings.

Open Access: Yes

DOI: 10.1007/978-3-030-16024-1_12