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Found 6414 publications
Analysis of stress-strain state changes in railway tracks during transition to European gauge
Publication Name: Iop Conference Series Earth and Environmental Science
Publication Date: 2024-01-01
Volume: 1348
Issue: 1
Page Range: Unknown
Description:
The geographical location of Ukraine facilitates its integration into the transportation network connecting European countries. Various options exist for transitioning from the gauge of 1 520 mm to the European standard gauge of 1 435 mm. This paper aims to analyze the changes in the stress-strain state of railway track elements during the reconstruction of existing sections from the 1 520 mm gauge to the 1 435 mm European gauge or to a dual gauge of 1 435/1 520 mm. To perform these calculations, a spatial model of dynamic deformations in the railway track is employed, based on the principles of elasticity theory. The implementation of a combined railway track complicates the stress state of the ballast layer, leading to asymmetric stresses along the length of the sleepers, which vary depending on the track on which trains operate. There is also a redistribution of stresses acting on the ground structure, which has been in operation for many years. The research results identify changes in the stress-strain state of the railway track and can be used to justify measures for the appropriate reinforcement of the ballast layer and the ground structure.
Open Access: Yes
Managing the resolution of simulation models
Publication Name: Esm 2008 2008 European Simulation and Modelling Conference Modelling and Simulation 2008
Publication Date: 2008-01-01
Volume: Unknown
Issue: Unknown
Page Range: 38-42
Description:
A novel approach based on inflation and deflation is proposed for managing the resolution of simulation models. Different methods are proposed for manual or automatic deflation. An example is given how a topology description language can be extended to support the inflation/deflation concept. Dynamic management of the model resolution is introduced using the method called inflate-the-next and also two of its possible improvements. © 2008 EUROSIS-ETI.
Open Access: Yes
DOI: DOI not available
Capsule Network based 3D Object Orientation Estimation
Publication Name: International Conference on Electrical Computer Communications and Mechatronics Engineering Iceccme 2023
Publication Date: 2023-01-01
Volume: Unknown
Issue: Unknown
Page Range: Unknown
Description:
Convolutional neural networks have proven to be one of the most efficient methods for processing visual data. Due to the popularity of the field, there is a growing interest in the reliability of intelligent systems. It has been shown that convolutional neural networks can be fooled by extreme inputs or noisy inputs. To overcome the current problems of convolutional neural networks, the theory of capsule networks was introduced by Geoffrey Hinton and his research team. In this work we want to investigate the theory of capsule networks for orientation recognition of 3-dimensional objects. We consider the case when the data are noise loaded by various adversarial attacking methods. We compare our results with the efficiency of convolutional neural network based solutions, highlighting the difference between the two theories. We investigate the efficiency reduction that can be observed using different adversarial attacking methods. Our results will show how much more efficient the capsule network is compared to the neural networks.
Open Access: Yes
On the sensitivity of the weighted relevance aggregation operator and its application to fuzzy signatures
Publication Name: Communications in Computer and Information Science
Publication Date: 2016-01-01
Volume: 611
Issue: Unknown
Page Range: 798-808
Description:
The weighted relevance aggregation operator is a modified, flexible version of the general power mean. In this paper we discuss the sensitivity of this operator, namely we give bounds on the change of the output in terms of vector norms of the change of the input variables. We apply these results to characterize to sensitivity of fuzzy signatures which are equipped with these operators in its nodes.
Open Access: Yes
Comparison of supply chain management (SCM) adoption at small and medium-sized enterprises (SMEs): A review from Hungary and Indonesia
Publication Name: Journal of International Studies
Publication Date: 2021-01-01
Volume: 14
Issue: 3
Page Range: 26-42
Description:
Large enterprises recognized first the importance of Supply Chain Management (SCM) strategy to achieve competitive advantage and process efficiency. Small and Medium-Sized Enterprises (SMEs) have specific challenges in adaptation. The authors conjectured that geographical and supply chain differences have a major effect on the adaptation level of SCM strategy and methods, especially for SMEs. To investigate it, this paper compares two countries, Hungary, and Indonesia. The research focus is on SMEs, based on a cross-sectional survey of 274 Hungarian and 110 Indonesian enterprises with informants mainly related to top management. The data indicated that in Indonesia, with a larger, more complex geographical structure and more advanced SCM capabilities, the SMEs have a higher implementation level of SCM strategy in their organization strategy compared to Hungary. However, the sample indicates that the tendencies are similar in both countries interpreting the inter-enterprise value chain and in utilizing SCM methods for cooperation with other parties, mostly using Vendor Managed Inventory (VMI) and Just in Time (JIT).
Open Access: Yes
Global burden of cancer in children and adolescents aged 0–19 years, 1990–2023: a systematic analysis for the Global Burden of Disease Study 2023
Jasvinder Singh Bhatti
Sayeh Ezzikouri
Ali Hasanpour- Dehkordi
Takeshi Fukumoto
Seyyed Shamsadin Athari
Hala Rashad Elhabashy
Aleksandr Y. Aravkin
Paul Narh Doku
Dariush Haghmorad
Theophilus I. Emeto
Adeniyi Francis Fagbamigbe
Nermin Ghith
Anis Ahmad Chaudhary
Mahwish Arooj
Hamidreza Hasani
Robert Kaba Alhassan
Salahdein Aburuz
Lucas Guimarães Abreu
Saeid Anvari
Muhammad Sohail Afzal
Jonathan M. Kocarnik
Mosab Arafat
Morenike Oluwatoyin Folayan
Hanadi Al Hamad
Ayesha Fahim
Mohammad Farahmand
Lisa M. Force
Adewale Oluwaseun Fadaka
Nadia M. Hamdy
Demelash Areda
Veer Bala Gupta
Maha Moh'd Wahbi Atout
Natalie Pritchett
Souad Bouaoud
Ayman Ahmed
Aso Mohammad Darwesh
Cem Bilgin
Dong Woo Choi
Wafa A. Aldhaleei
Awais Altaf
Ferrán Catalá-López
Danish Ahmad
Bashir Dabo
Rakhi Dandona
Mohammed Albashtawy
Mohamed Abouzid
Omotayo Francis Fagbule
Shirin Barati
Soham Bandyopadhyay
Ahmed Y. Azzam
Abdulfatai Aremu
Teferi Gebru Gebremeskel
Arvin Haj-Mirzaian
Catherine Bisignano
Aragaw Tesfaw Desale
Benedetta Armocida
Hasan Aalruz
Kayleigh Bhangdia
Isaac Sunday Chukwu
Md Kamrul Hasan
Promit Ananyo Chakraborty
Louise Penberthy
Maryam Bemanalizadeh
Robert Kokou Dowou
Giulia Carreras
Xiaochen Dai
Maysaa El Sayed Zaki
Johannes Haubold
Mohammad Asghari-Jafarabadi
Fatemeh Afrashteh
John Dube
Ali Hasanpour- Dehkordi
Shahkaar Aziz
Logan M. Glasstetter
Genanew K. Getahun
Sri Harsha Boppana
Alistair Acheson
Chiranjib Chakraborty
Saroja Devi Geetha
Razieh Bahreini
Yohannes Habtegiorgis Abate
Sabah Al-Marwani
Mohammad Mahdi Bastan
Samuel Demissie Darcho
Thao Huynh Phuong Do
Miglas Welay Gebregergis
Lee Deitesfeld
Abdel Rahman E'mar
Mohammed Elshaer
Lemessa Assefa A. Ayana
Chadi Eltaha
Awoke Derbie Habteyohannes
Abid Ali
Safwat Aly
Nguyen Hoang Anh
Andrew Crist
Miranda L. May
Maha Moh d.Wahbi Atout
Hasan Aalruz
Syed Anees Ahmed
Demelash Areda
Lalit Dandona
Karem H. Alzoubi
Yasser Bustanji
Publication Name: Lancet
Publication Date: 2026-04-04
Volume: 407
Issue: 10536
Page Range: 1360-1373
Description:
Background Information on childhood cancer burden is crucial for effective cancer policy planning. Unfortunately, observed paediatric cancer data are not available in every country, and previous global burden estimates have not discretely reported several common cancers of childhood. We aimed to inform efforts to address childhood cancer burden globally by analysing results from the Global Burden of Diseases, Injuries, and Risk Factors Study (GBD) 2023, which now include nine additional cancer causes compared with previous GBD analyses. Methods GBD 2023 data sources for cancer estimation included population-based cancer registries, vital registration systems, and verbal autopsies. For childhood cancers (defined as those occurring at ages 0–19 years), mortality was estimated using cancer-specific ensemble models and incidence was estimated using mortality estimates and modelled mortality-to-incidence ratios (MIRs). Years of life lost (YLLs) were estimated by multiplying age-specific cancer deaths by the standard life expectancy at the age of death. Prevalence was estimated using survival estimates modelled from MIRs and multiplied by sequelae-specific disability weights to estimate years lived with disability (YLDs). Disability-adjusted life-years (DALYs) were estimated as the sum of YLLs and YLDs. Estimates are presented globally and by geographical and resource groupings, and all estimates are presented with 95% uncertainty intervals (UIs). Findings Globally, in 2023, there were an estimated 377 000 incident childhood cancer cases (95% UI 288 000–489 000), 144 000 deaths (131 000–162 000), and 11·7 million (10·7–13·2) DALYs due to childhood cancer. Deaths due to childhood cancer decreased by 27·0% (15·5–36·1) globally, from 197 000 (173 000–218 000) in 1990, but increased in the WHO African region by 55·6% (25·5–92·4), from 31 500 (24 900–38 500) to 49 000 (42 600–58 200) between 1990 and 2023. In 2023, age-standardised YLLs due to childhood cancer were inversely correlated with country-level Socio-demographic Index. Childhood cancer was the eighth-leading cause of childhood deaths and the ninth-leading cause of DALYs among all cancers in 2023. The percentage of DALYs due to uncategorised childhood cancers was reduced from 26·5% (26·5–26·5) in GBD 2017 to 10·5% (8·1–13·1) with the addition of the nine new cancer causes. Target cancers for the WHO Global Initiative for Childhood Cancer (GICC) comprised 47·3% (42·2–52·0) of global childhood cancer deaths in 2023. Interpretation Global childhood cancer burden remains a substantial contributor to global childhood disease and cancer burden and is disproportionately weighted towards resource-limited settings. The estimation of additional cancer types relevant in childhood provides a step towards alignment with WHO GICC targets. Efforts to decrease global childhood cancer burden should focus on addressing the inequities in burden worldwide and support comprehensive improvements along the childhood cancer diagnosis and care continuum. Funding St Jude Children's Research Hospital, Gates Foundation, and St Baldrick's Foundation.
Open Access: Yes
The impact of the hotel industry on the competitiveness of tourism destinations in Hungary
Publication Name: Journal of Competitiveness
Publication Date: 2016-12-01
Volume: 8
Issue: 4
Page Range: 85-104
Description:
This paper focuses on a complex question from the perspective of the hotel industry. It tries to draw attention to the importance of hotels, enhancing it on the basis of the tourism destination competitiveness models and introducing the role and place of the hotel industry in the most important models. The hotel industry research evaluates the most important tourism destinations of Hungary on the micro-regional level that justifies the importance and contribution of the hotels and accommodations to competitiveness and success of tourism destinations with exact results. As a result of the research, the micro-regional destinations can be ranged within three groups in Hungary. In the first group of the most developed and most competitive tourism destinations, the hotel industry plays a very important role. In these regions, the hotel industry has a significant effect not only on competitiveness of tourism but also on general development of the regions. In the second group, which can be still called tourism destination, tourism and the hotel industry both play a significant role, but only the competitiveness of tourism can be considered good, the effects of the tourism on general development of the region can be proved only to a lesser extent. In the third group, the effects of tourism and the hotel industry can only be experienced to a lesser extent. The majority of these regions are not considered to be attractive tourism destinations for tourists any more.
Open Access: Yes
Automated Assessment of Engine Performance During Dynamometer Testing †
Publication Name: Engineering Proceedings
Publication Date: 2024-01-01
Volume: 79
Issue: 1
Page Range: Unknown
Description:
The ever-increasing number of novel functions in modern vehicles continuously expands with the application of cognitive information technology, creating a new need for testing during market introduction. As the virtual test environment evolves, the need for real tests conducted on the road continuously decreases, saving time and cost while maximizing quality indicators. This article presents a new type of automatic monitoring system created in a fully virtual test environment. The automated assessment during dynamometer testing (ADT) method automatically evaluates the values measured on the engine dynamometer at predefined intervals, compares them to reference data, and provides feedback on the correctness of the current test. The present paper discusses the monitoring methodology and its application on an engine dynamometer, and it presents the results of the method applied during a real engine test.
Open Access: Yes
Analysis of the Relationship Between Discharge Cutoff Voltage and Thermal Behavior in Different Lithium-Ion Cell Types
Publication Name: Applied Sciences Switzerland
Publication Date: 2026-01-01
Volume: 16
Issue: 1
Page Range: Unknown
Description:
Optimizing the operating temperature of lithium-ion batteries is critical for safe, reliable, and efficient cell operation. Manufacturers’ recommendations vary in this area, which is primarily determined by the cells’ chemical composition and internal structural characteristics. Most manufacturers define the maximum charging voltage level as the same or close to the same value, but there are significant differences in the lower threshold voltage. Lithium-ion cells exhibit increased internal resistance at lower state-of-charge levels, resulting in elevated heat generation during operation, with intensity proportional to the depth of discharge. However, using a too low voltage threshold causes a significant loss of usable capacity, which reduces the cell’s energy utilization. The present research aims to define and analyze the optimal value of the lower voltage threshold more precisely, considering both thermal development and usable capacity aspects. A further objective is to determine an optimal energy safety margin level that provides a suitable compromise for longer-term storage. Different 18650 and 21700 standard lithium-ion cell types were tested using various load profiles. The results show that the two cell formats have different electro-thermal behaviors. The 21700 cells show a clear increase in thermal efficiency at around 3.1 V. In contrast, the 18650 cells have a heating pattern that depends heavily on the load. This requires selecting a cutoff that adapts to the discharge rate to prevent excessive thermal stress. These findings indicate that a fixed lower threshold voltage for all cells is not ideal. Instead, we need cutoff strategies that are specific to each cell and can change dynamically. The TER-based evaluation introduced in this work provides a practical framework for defining these adaptive limits. It may improve control in battery management systems in real-world applications.
Open Access: Yes
DOI: 10.3390/app16010079
