Search in Publications

Found 6383 publications

On Applying Expert Knowledge for Spline-Based Segmentation of Liver on Computed Tomography Images

Melinda Kovacs Patrik Gabor Rozsa Szilvia Nagy

Publication Name: 2023 58th International Scientific Conference on Information Communication and Energy Systems and Technologies Icest 2023 Proceedings

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: 21-24

Description:

The segmentation of the liver from the surrounding soft tissues between the ribs on a non-enhanced, arterial or delayed phase computed tomography image complicated, as the muscle and many other soft tissues have very similar X-ray attenuation to the liver, thus they manifest as similar intensity and similar pattern domains on the computed tomography images. However, if the anatomical setup of the human body and the location of the bones, that have much higher attenuation are taken into account, a sufficiently smooth and precise borderline can be drawn between the ribcage and the liver, that can be developed into a liver contour by successive erosion and active contour methods.

Open Access: Yes

DOI: 10.1109/ICEST58410.2023.10187395

Burnout syndrome among Hungarian midwives in 2014 and 2022

Mihály Dió Ibolya Lipienné Krémer József Vitrai Zsuzsanna Soósné Kiss

Publication Name: Orvosi Hetilap

Publication Date: 2023-10-08

Volume: 164

Issue: 40

Page Range: 1592-1599

Description:

Introduction: The healthcare sector is the most studied area of burnout, as the mental health of healthcare workers has a significant impact on the mental health of the people they care for. Objective: The aim of our study was to investigate whether there have been changes in the dimensions of burnout among midwives, and how the relationships between burnout and the individual factors and working conditions that influence it have evolved, using national data from 2014 and 2022. Method: An anonymous, voluntary, questionnaire-based survey of midwives working exclusively in maternity units was conducted using the Maslach Burnout Inventory questionnaire, which measures burnout, and questions on respondents demographic characteristics and working conditions. Multivariate ordinal logistic regression was used to explore associations between burnout and respondent characteristics, and associations were characterized by odds ratios. Results: Among the dimensions of burnout, no change in depersonalization was observed in 2022, but both emotional exhaustion and personal ineffectiveness were significantly more common in 2022 than in 2014. Responses from 224 midwives in 2014 and 152 midwives in 2022 were analyzed. Looking at the influencing factors, higher levels of burnout in 2014 were significantly associated with poorer perceived health, lack of a partner, smoking, shorter time in healthcare, having a job in a larger city, feeling overworked and dissatisfied. In 2022, on the other hand, younger age, smoking, shorter time in healthcare, feeling overworked, dissatisfied and unvalued were associated with higher levels of burnout. Looking at the combined effect of these factors, willingness to attend a health promotion lecture and having a second job also showed a significant effect on burnout in 2022. Discussion: The authors discuss the change in burnout among midwives and the possible reasons for the correlations shown. Conclusion: The results of the first study on burnout among midwives in Hungary show that improving the working conditions of midwives is essential for the functioning of family-friendly midwifery. In addition, to prevent burnout, more emphasis should be placed on the prevention of the risk factors identified in the study in education and training.

Open Access: Yes

DOI: 10.1556/650.2023.32884

Waste marble dust-filled sustainable polymer composite selection using a multi-criteria decision-making technique

László Lendvai Punyasloka Pattnaik Lalit Ranakoti Deepika Shekhawat Tej Singh

Publication Name: Arabian Journal of Chemistry

Publication Date: 2023-06-01

Volume: 16

Issue: 6

Page Range: Unknown

Description:

This research works with the optimal design of marble dust-filled polymer composites using a multi-criteria decision-making (MCDM) technique. Polylactic acid (PLA) and recycled polyethylene terephthalate (rPET)-based composites containing 0, 5, 10, and 20 wt% of marble dust were developed and evaluated for various physicomechanical and wear properties. The results showed that the incorporation of marble dust improved the modulus and hardness of both PLA and rPET. Moreover, a marginal improvement in flexural strength was noted while the tensile and impact strength of the matrices were deteriorating due to marble dust addition. The outcomes of wear analysis demonstrated an improvement in wear resistance up until 10 wt% filler reinforcement, after which the incidence of dust particles peeling off from the matrix was observed, thereby reducing its efficiency. The best tensile modulus of 3.23 GPa, flexural modulus of 4.39 GPa, and hardness of 83.95 Shore D were obtained for 20 wt% marble dust-filled PLA composites. The lowest density of 1.24 g/cc and the highest tensile strength of 57.94 MPa were recorded for neat PLA, while the highest impact strength of 30.94 kJ/m2 was recorded for neat rPET. The lowest wear of 0.01 g was obtained for the rPET containing 5 wt% marble dust content. The experimental results revealed that for the examined criteria, the order of composite preference is not the same. Therefore, the optimal composite was identified by adopting a preference selection index-based MCDM technique. The findings demonstrated that the 10 wt% marble dust-filled PLA composite appears to be the best solution with favorable physical, mechanical, and wear properties.

Open Access: Yes

DOI: 10.1016/j.arabjc.2023.104695

Identifying Critical Areas in Industrial Employment: Emerging Hot Spot Analysis of Workforce Expectations

Adriana Grigorescu Camelia Speranta Pirciog Cristina Lincaru Dalia Streimikiene Narcis Copcă

Publication Name: Economic Computation and Economic Cybernetics Studies and Research

Publication Date: 2025-01-01

Volume: 59

Issue: 4

Page Range: 269-291

Description:

This paper investigates the spatiotemporal distribution of employment expectations in industry (BS-IEME-BAL) between 1992 and 2025, using DG ECFIN Business and Consumer Surveys (BCS) data. The main aim is to identify areas with critical dynamics of the industrial labour market and to assess regional trends in labour fluctuations. The method used is based on Emerging Hot Spot Analysis (EHSA) in GIS, which allows the detection of regions where employment growth or decline has a persistent, oscillating, or emerging trend. The algorithm classifies areas according to the intensity and persistence of variations, allowing for anticipation of the impact of economic transformations on the industrial labour market. The study highlights critical regions where public policies can intervene to mitigate the negative effects or to support sustainable employment growth. Identifying hot spots in the industry contributes to the development of adaptive territorial strategies, based on spatial data, for the efficient management of structural changes in the labour market.

Open Access: Yes

DOI: 10.24818/18423264/59.4.25.15

Military Marxism: Africa’s Contribution to Revolutionary Theory, 1957–2023

Adam Mayer

Publication Name: Military Marxism Africas Contribution to Revolutionary Theory 19572023

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 1-324

Description:

Adam Mayer's Military Marxism: Africa's Contribution to Revolutionary Theory, 1957-2023 explores African Marxist theory and the intellectual merits of Afro-Maxist schools of thought to show how they have developed and impacted sub-Saharan Africa from the Cold War to the present. He also discusses the efficacy of the movements influenced by Marxism and how they are contested today. Through in-depth research, Mayer answers the following questions: Who were the African Marxist intellectuals? What happened to these intellectuals in the 1990s in NGO-administered, deindustrialized Africa? How are these theories inspiring popular rebellions and radical anti-Western military coups today? This book explores how Military Marxism, through its own rich and variegated African theory, has continued to inform and guide the practice of various political movements today.

Open Access: Yes

DOI: 10.5040/9781978747524

Stability of the rubbing phenomenon with the gyroscopic effect

Peter Triesz

Publication Name: Pollack Periodica

Publication Date: 2010-04-01

Volume: 5

Issue: 1

Page Range: 65-72

Description:

The rubbing, as an undesired non-linear dynamical behavior of rotors, is a widely studied topic in the field of rotor-dynamics. Standard models usually use the classic Jeffcott rotor system with several rolling and journal (bearings without rolling elements, usually filled with oil) bearings, or with magnetic ones. The present paper investigates a model that takes into consideration also the gyroscopic effect and its influence on the rubbing phenomenon. © 2010 Akadémiai Kiadó.

Open Access: Yes

DOI: 10.1556/Pollack.5.2010.1.4

Wavelet analysis and finite difference modeling of multiple reflections in transmission lines

A. Bekefi András Fehér Szilvia Nagy

Publication Name: 2nd Middle East Conference on Antennas and Propagation Mecap 2013

Publication Date: 2012-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

No description provided

Open Access: Yes

DOI: 10.1109/MECAP.2012.6618201

Optimization of vertical farms energy efficiency via multiperiodic graph-theoretical approach

Jean Pimentel Ferenc Friedler L. Balázs

Publication Name: Journal of Cleaner Production

Publication Date: 2023-09-01

Volume: 416

Issue: Unknown

Page Range: Unknown

Description:

A systematic method is proposed for enhancing the energy efficiency of vertical farms when integrated into urban infrastructure. The method relies on the optimization of a multiperiod model that determines the system's best operation plan considering variations in its parameters throughout the day. These parameters include factors such as resources availability from the urban infrastructure and fluctuations in electricity prices. The model is formulated and solved via the tools of the P-graph framework, which permits the automatic formulation of the rigorous superstructure and the efficient optimization of the integrated system's operation. The method is illustrated via a case study comprising three scenarios. The most efficient case demonstrates up to 40% electricity cost saving potential for a particular operation day, and up to 31% for the entire year. The method presented constitutes an optimization tool that can use real data on electricity prices and forecasts of weather conditions to reduce operating costs and enhance the energy efficiency and sustainability of vertical farming systems.

Open Access: Yes

DOI: 10.1016/j.jclepro.2023.137938

Evolution of the Road Network Topology of Central European Housing Estates

Csaba Koren Attila Borsos Pál Hegyi

Publication Name: Infrastructures

Publication Date: 2023-10-01

Volume: 8

Issue: 10

Page Range: Unknown

Description:

The analysis of road network topology has attracted the attention of researchers in the past few decades. In this study, the road topology of housing estates in a few selected Central European countries (Hungary, Austria, Czech Republic, and Slovakia) was analysed. This research was carried out in three steps: (1) the road network topology of different decades from the 1950s to the 1980s was described, (2) the ratio of intersections and dead-ends was investigated, and (3) the connectivity indices were analysed and compared. The research was carried out using ESRI ArcGIS software. The results show that the design of road networks built in different countries is similar in the housing estates studied. When analysing the road networks over time, significant differences could be found in the case of Hungary for housing estates built after the 1960s. In general, connectivity has become more important, as it has gradually increased over time.

Open Access: Yes

DOI: 10.3390/infrastructures8100142