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Found 6407 publications

Performance analysis and comparison of four DNS64 implementations under different free operating systems

Sandor R. Repas G. Lencse

Publication Name: Telecommunication Systems

Publication Date: 2016-12-01

Volume: 63

Issue: 4

Page Range: 557-577

Description:

The depletion of the global IPv4 address pool made the deployment of IPv6, the new version of the Internet Protocol, inevitable. In this paper, the transition mechanisms for the first phase of IPv6 deployment are surveyed and the DNS64 plus NAT64 solution is found appropriate. The most important free and open source DNS64 implementations are selected: BIND, TOTD, Unbound and PowerDNS. The test environment and the testing method are described. The first three of the selected DNS64 implementations are tested under Linux, OpenBSD and FreeBSD whereas PowerDNS is tested only under Linux. Their performance characteristics (response time, number of answered requests per second, CPU and memory consumption) are measured and compared. The effect of the hardware architecture of the test computer is also examined by using single-core, dual-core and quad-core test computers. The stability of all the tested DNS64 solutions are analyzed under overload conditions to test if they may be used in production environments with strong response time requirements. Our measurement results show significant differences in the performance of the tested DNS64 implementations, e.g. Unbound served four times more requests per second than PowerDNS (when executed by a single-core CPU under Linux and load was generated by eight clients). However, no absolute order can be determined, because it is influenced by different factors such as the architecture of the hardware, especially the number of cores, because BIND and PowerDNS are multithreaded (therefore they can profit from the multiple cores) but TOTD and Unbound are not. Also the operating system of the DNS64 server has significant influence on the performance of the DNS64 implementations under certain conditions. All the details of our measurements are disclosed and all the results are presented in the paper. An easy-to-use implementation selection guide is also provided as a short summary of our high number of results.

Open Access: Yes

DOI: 10.1007/s11235-016-0142-x

Genome-Wide Association Study of Exercise Addiction Among Elite Wrestlers

Ildus I. Ahmetov Seyrani Koncagul Mehmet A. Ergun Hasan H. Kazan Celal Bulgay Anıl Kasakolu Mark D. Griffiths Türker Bıyıklı Mark D. Griffiths Attila Szabo

Publication Name: Brain Sciences

Publication Date: 2025-02-01

Volume: 15

Issue: 2

Page Range: Unknown

Description:

Background: Exercise addiction, marked by an inability to control exercise and associated with distress that clinically impairs daily activities, is a significant but underrecognized issue in physical activity and health. While its physiological, psychological, and behavioral aspects have been studied, the genetic basis of exercise addiction remains poorly understood, requiring further investigation. The present study conducted a genome-wide association study of exercise addiction among elite Turkish wrestlers. Methods: The sample comprised 67 male wrestlers (34 freestyle wrestlers and 33 Greco-Roman wrestlers). Exercise addiction was assessed using the Exercise Addiction Scale. Whole-genome genotyping was performed using DNA microarray. Results: Using a genome-wide approach (p < 1.0 × 10−⁵), we identified six suggestively significant single-nucleotide polymorphisms (SNPs) associated with exercise addiction status. Of these, the high-addiction alleles of five SNPs (PRDM10 rs74345126, near PTPRU rs72652685, HADHB rs6745226, XIRP2 rs17614860, and near GAREM2 rs1025542) have previously been associated with an increased risk of mental health disorders such as anxiety and depression or higher levels of physical activity. We also examined potential associations between the genetic markers previously linked to addiction-related traits such as obsessive–compulsive disorder and cigarette smoking, and personality traits linked to negative emotions including neuroticism. Using this candidate gene approach (p < 0.05), we identified three additional SNPs associated with exercise addiction in the same direction of association (DEFB135 rs4841662, BCL11A rs7599488, and CSRNP3 rs1551336). Conclusions: The present study provides preliminary evidence for the genetic basis of exercise addiction, highlighting specific SNPs that may play a role in the development of this condition among elite wrestlers.

Open Access: Yes

DOI: 10.3390/brainsci15020102

Case study-based scenario analysis comparing GHG emissions of wine packaging types

Boglárka Eisingerné Balassa Ágnes Csiba-Herczeg Réka Koteczki Bence Lukács

Publication Name: Cleaner Engineering and Technology

Publication Date: 2023-08-01

Volume: 15

Issue: Unknown

Page Range: Unknown

Description:

The wine market has faced a serious problem in recent years, as the cost and environmental impact of commonly used wine bottles has become unsustainable for producers. In this paper, we present a case study of one of the largest wineries in Hungary, with the aim of investigating sustainability factors related to packaging materials. The winery has provided us with data on three types of bottles (Burgundy Glass Bottle, Bordeaux Glass Bottle and Bordeaux polyethylene terephthalate (PET) Bottle), for which the greenhouse gas emissions (GHG) related to production and the Co2e related to transport are calculated as part of Life Cycle Analysis (LCA). The maximum transport weight per truck is 23 501.70kg for Bordeaux PET bottle, 19 951.14 kg for Burgundy glass bottle and 22 290.18 kg for a Bordeaux glass bottle. In Hungary, a new law on packaging will come into force, whereby bottles will be subject to a deposit scheme. For this reason, eight scenarios were set up to calculate GHG emission. In the study, two types of raw material were investigated, glass and polyethylene terephthalate (PET), and calculations were made with recycled and reused materials. As a result of the study, the cases with the lowest Carbon dioxide equivalent (CO2e) emissions are those with the highest amounts of recycled and reused packaging materials. Among the scenarios presented, the one with the lowest emissions in terms of production and transport is the case where 70% Bordeaux Recycled Glass Bottle and 30% rPET are used (247 231.697 kgCO2e). This scenario has 64% less GHG emissions than the scenario where only glass is used. In the present study, we performed a cradle-to-gate analysis of wine packaging, which may be worth expanding in future research with additional input and output factors during the product life cycle. The research carried out in this study also lays the foundation for research on consumer behaviour related to alternative wine packaging.

Open Access: Yes

DOI: 10.1016/j.clet.2023.100649

Does Green Energy and Technological Innovations Induce Agriculture and Land Sustainability: Contextual Evidence From Climate Resilient Practices

Judit Petra Koltai Agnieszka Majewska Karolina Kowalczyk Lidi Yuan Sala Dariusz

Publication Name: Land Degradation and Development

Publication Date: 2026-01-30

Volume: 37

Issue: 2

Page Range: 790-805

Description:

With the growing environmental concerns, the existing literature mostly highlights the industrial pollution while neglecting the factors associated with the agriculture-related greenhouse gas emissions. Regarding this, the study explores the impacts of green energy, tech development, and urbanization on agriculture's greenhouse gas emissions. The prime objective of the current research is to unveil the green energy, tech innovations, and environmental sustainability nexus to draw novel implications in the context of Sustainable Development Goals (SDGs). In doing so, the authors employ the quarterly data of China from 1990Q1 to 2020Q4. For the long-run empirical analysis, the authors utilize various time-series estimating approaches, such as Quantile regression, which performs better in testing the nexus at different quantiles. However, the Fully Modified OLS, Dynamic OLS, and Canonical Cointegration Regression methods are used as robustness tools to authenticate the estimate of the primary approach. The results suggest that greener energy and technological innovations significantly reduce agriculture sector emissions. Furthermore, the presence of green energy transforms its negative influence into a positive one. Contrastingly, the use of traditional fossil fuel energy, urbanization, and financial development are significant drivers of emissions. This study's findings support SDGs, particularly SDG-2, which supports the stance of sustainable agriculture and encourages green energy use. Overall, the study discourses policy-related suggestions in the sustainability's context.

Open Access: Yes

DOI: 10.1002/ldr.70219

Spectral Non-Stationarity in Road Vehicle Vibrations

László Róbert Hári

Publication Name: Periodica Polytechnica Transportation Engineering

Publication Date: 2023-01-01

Volume: 51

Issue: 1

Page Range: 79-88

Description:

Road-induced vibrations are in the scope of various environmental testing protocols, e.g., for packaging vibration testing (PVT) purposes. This field matures with well-understood methods for analyzing amplitude-type non-stationarity (NS) in road vehicle vibrations (RVV). Albeit frequency-type NS is well known, only suggestions are provided for processing the phenomenon in PVT. Both types of NS can be jointly investigated in the time-frequency domain; thus, the current study initiates the investigation of spectral non-stationarities (SNS) in RVV. Three vibration series were recorded from 118 km traveled distance supplying an empirical insight.

Open Access: Yes

DOI: 10.3311/PPtr.18318

OEE measurement at the automotive semi-automatic assembly lines

János Jósvai Péter Dobra

Publication Name: Acta Technica Jaurinensis

Publication Date: 2021-02-24

Volume: 14

Issue: 1

Page Range: 24-35

Description:

Manufacturing companies continuously evaluate their achieved performance based on different Key Performance Indicators (KPI). This article gives an overview about the OEE values. The study aims to provide practical OEE data of semi-automatic assembly lines used in the automotive industry. Its novelty is the revealed relationship between seat assembly lines and seat subassembly lines. Firstly, a literature review shows the scientific relevance and several cases are collected to increase OEE percentage. Secondly, the connection between chassis, tracks, recliner and mechanism assembly lines is described. Each part of OEE (availability, performance, quality) are analysed in terms of their impact.

Open Access: Yes

DOI: 10.14513/actatechjaur.00576

3D model estimation from multiple images

András Rövid Peter Varlaki Annamária R. Várkonyi-Kóczy

Publication Name: IEEE International Conference on Fuzzy Systems

Publication Date: 2004-12-01

Volume: 3

Issue: Unknown

Page Range: 1661-1666

Description:

3D reconstruction plays a very important role in computer vision. The determination of the 3D model from multiple images is of key importance. In this paper a 3D reconstruction algorithm is introduced, which is capable to determine the 3D model without any external intervention.

Open Access: Yes

DOI: 10.1109/FUZZY.2004.1375430

Digital image analysis of sheet metal testing and forming

Szabolcs Szalai Imre Czinege

Publication Name: 15th Imeko Tc10 Workshop on Technical Diagnostics 2017 Technical Diagnostics in Cyber Physical Era

Publication Date: 2017-01-01

Volume: Unknown

Issue: Unknown

Page Range: 176-180

Description:

Digital image analysing methods are widely used for evaluating local deformations in sheet metal tests and forming processes. The paper is focusing on tensile tests of uniform and non-uniform width flat specimens made of aluminum alloys, which are suitable for demonstrating Löders strain, Portevin-Le Chatelier (PLC) effect and for determination of Forming Limit Curve. Tests were carried out using GOM-ARAMIS® digital image analysis hardware and software. Observation of local deformations during tensile tests showed that initiation and evolution of local strains depend on the position of specimens related to rolling direction of sheet. Using non-uniform width specimens the local deformations are concentrated on the smallest cross-section in the final stage of tensile test. The measured major and minor strains give points of FLC.

Open Access: Yes

DOI: DOI not available

Temporal changes in serum total cholesterol levels during a 30-year follow-up in a South Hungarian village population

László Márk Vince Hanyecz Viktor L. Nagy Rita Szendrei-Lódi József Vitrai

Publication Name: Orvosi Hetilap

Publication Date: 2026-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

Introduction: Elevated serum cholesterol is a major cardiovascular risk factor. Population-level trends in total cholesterol reflect changes in lifestyle, diet, and pharmacological treatment. Objective: To assess temporal changes in serum total cholesterol levels in the population of a South Hungarian village over a 30-year period. Method: Serum total cholesterol was measured in Méhkerék residents in 1994 and 2014 following professional guidelines, and re-examined in 2024. Temporal trends were analyzed using multiple regression and analysis of covariance. Results: The study included 760 individuals in 1994, 391 in 2014, and 544 in 2024. Due to changes in age and sex composition, analyses were standardized for 40-, 50-, and 70-year-old men and women. Among 40-year-old women, cholesterol decreased by 3% from 1994 to 2024, and by 10% and 25% among 50- and 70-year-olds, respectively. In men, the corresponding reductions were 11%, 17%, and 28%. No significant difference was found between 1994 and 2014 (p = 0.117), but the decline became significant by 2024 (p<0.001). Cholesterol levels were significantly associated with sex (p = 0.005) and age (p<0.001), and a time × age interaction indicated a more pronounced decline in older participants. Conclusion: According to a detailed review of the available literature, this is the first comprehensive epidemiological study conducted on a Hungarian population over a 30-year period, which follows the serum total cholesterol levels of the entire population of a settlement. The significant long-term reduction likely reflects combined effects of medical therapy and lifestyle improvements. These findings emphasize the preventive role of general practice and the need for more focused cardiovascular prevention among younger individuals and women. Orv Hetil. 2026; 167(1): 9–15.

Open Access: Yes

DOI: 10.1556/650.2026.33445