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Found 6427 publications

Dynamic Connectedness Between a Corporate Bond Market With WTI, Geopolitical and Financial Volatility: Spillover From Post-COVID-19 and Russian-Ukrainian Clash

Mohammad Sharif Karimi Kamel Si Mohammed Umer Shahzad

Publication Name: International Journal of Finance and Economics

Publication Date: 2026-04-01

Volume: 31

Issue: 2

Page Range: 2194-2207

Description:

This study investigates the dynamic connectedness between the USA's corporate bond market (CB) and various factors, including WTI, financial uncertainty, and geopolitical risks. We employ two advanced techniques to analyse these relationships: TVP-Vector autoregressive (TVP-VAR) and VAR connectedness. Specifically, we focus on two significant events, the Russian-Ukrainian conflict (RUC) and the COVID-19 pandemic (C19P), to provide insights into the behaviour of the CB during these critical periods against the oil prices and uncertainties. The empirical analysis reveals compelling findings, particularly concerning the extreme events and the magnitude of effects observed. We find a significant increase in interconnections over the time impacts during these two events, lending support to using an asymmetric and heterogeneous product over the time-varying. Furthermore, we observe that the influence of the GPR and the VIX factors is more robust when uncertainty rises rather than decreases, indicating temporary events. Policymakers and macroprudential authorities can benefit from these findings, as they emphasise the need to adapt to a changing monetary policy and reduce reliance on energy volatility to make informed decisions in a rapidly evolving financial landscape.

Open Access: Yes

DOI: 10.1002/ijfe.70037

Dynamics of Classical Fuzzy Cognitive Maps

Istvan A. Harmati

Publication Name: Studies in Fuzziness and Soft Computing

Publication Date: 2024-01-01

Volume: 427

Issue: Unknown

Page Range: 105-119

Description:

In Fuzzy Cognitive Map based modelling, the final conclusion is based on the assumption that the system reaches an equilibrium point (fixed point) after a certain number of iteration. It is not straightforward that this leads to a fixed point, since the iteration may show various dynamical behaviours: multiple fixed points, limit cycle and unpredictable patterns may also occur. In this chapter, a gentle insight into the dynamics of FCMs’ is provided based on solid mathematical tools. We prove sufficient conditions for the existence and uniqueness of fixed points for sigmoid, hyperbolic tangent and rescaled sigmoid FCMs, which are also necessary in the case of the latter two. Additionally, symmetrical properties of fixed points and basins of attraction of hyperbolic tangent and rescaled sigmoid FCMs are also introduced with mathematical proof.

Open Access: Yes

DOI: 10.1007/978-3-031-37959-8_9

Control, Responsibility, Censorship: The Institutional Structure of Hungarian Press Regulation During the First World War – Within the Framework of the 1912 Act on Exceptional Powers

Roland Kelemen

Publication Name: Journal on European History of Law

Publication Date: 2025-01-01

Volume: 16

Issue: 2

Page Range: 133-140

Description:

This study explores the institutional structure of press regulation in Hungary during the First World War, with particular emphasis on there construction of jurisdictional and supervisory relationships. Rather than following a unified, hierarchical model, the wartime system operated through a complex, multi-actor network involving ministries, the Board of Military Supervision (HFB), the Press Subcommittee, prosecutorial authorities, military commands, and the Prime Minister’s Press Office. Drawing on archival sources and official reports, the analysis outline show actual control over the press was divided, how political, military, and judicial authorities exercised oversight, and how mechanisms such as the “three-hour censorship,” confidential notices, and objective prohibitions functioned in practice. Particular attention is paid to the fragmented and contingent nature of provincial press oversight, shaped by structural inconsistencies, linguistic limitations, and proximity to the front. Rather than relying on abstract theoretical frameworks, the article reconstructs the internal dynamics of exceptional legal regulation through the lens of everyday practice and applied legal logic.

Open Access: Yes

DOI: DOI not available

Overview of Hungarian operations research based on the VOCAL 2022 conference

Botond Bertok Marianna E.-Nagy Péter Biró

Publication Name: Central European Journal of Operations Research

Publication Date: 2024-12-01

Volume: 32

Issue: 4

Page Range: 897-902

Description:

The latest results of the Hungarian operations research community is reviewed based on the presentations given at the VOCAL 2022 conference. International collaborations and the continuation of research published at previous conferences of the series are also summarized.

Open Access: Yes

DOI: 10.1007/s10100-024-00930-3

Overall Equipment Effectiveness (OEE) Complexity for Semi-Automatic Automotive Assembly Lines

János Jósvai Péter Dobra

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2023-01-01

Volume: 20

Issue: 2

Page Range: 63-82

Description:

In industrial practice, measuring and monitoring production performance is an essential task. The production plan performance is monitored by middle and top management of companies daily, weekly and monthly and make short and long-term operational and strategic decisions when necessary. One of the most common ways of measuring the performance of production and, within this, of assembly lines, is to use the Overall Equipment Effectiveness (OEE) indicator. Although companies sometimes interpret and use this Key Performance Indicator (KPI) in their own way, it is the indicator that best reflects the development of the production efficiency for a given company. A high OEE percentage means high performance, which directly increases the company's profitability. This article explores the complexity of the OEE indicator, supported by the use of a cause and effect diagram. Firstly, a literature review demonstrates scientific relevance. Secondly, the factors affecting OEE are grouped and analyzed according to the following six aspects: man, environment, method, material, machine, and measurement. Each factor is further subdivided into five groups, and then these subgroups also cover five key factors of importance for the approachability of 100% OEE. The 150 aspects listed herein, provide a complete guideline for a semi-automatic assembly line, to consistently increase efficiency in industrial practice.

Open Access: Yes

DOI: 10.12700/APH.20.2.2023.2.4

Effects of green HRM practices on environmental performance: the role of green organisational citizenship behaviour, psychological green climate, and green self-efficacy for greening healthcare organisations

Jason Turner Gábor Szábo-Szentgróti Fatema Jannat Masum Miah Virág Walter

Publication Name: Social Responsibility Journal

Publication Date: 2026-03-16

Volume: 22

Issue: 4

Page Range: 725-759

Description:

Purpose – This study aims to investigate how psychological green climate (PGC), green organisational citizenship behaviour (GOCB) and green self-efficacy (GSE) play a role in the relationship between green human resource management (GHRM) and environmental performance (EP) in healthcare organisations. Design/methodology/approach – The research has applied a quantitative research method using partial least squares structural equation modelling to test the hypotheses from a conceptual framework derived from the literature. The research collected data from 509 employees (managerial and non-managerial) from healthcare organisations in Bangladesh employing a cross-sectional survey using two steps of non-probability sampling, i.e. purposive sampling and convenience sampling for data collection through a self-administered questionnaire. Findings – The findings from this research are three-fold. Firstly, GHRM does not have a direct effect on EP. Secondly, PGC and GOCB partially and sequentially mediate between GHRM and EP. Thirdly, GSE and GOCB partially and sequentially mediate between GHRM and the EP of healthcare organisations. Practical implications – The study makes recommendations for healthcare managers and policymakers with regards ensuring environmental sustainability focusing on the employee’s behaviour and psychological factors. As the healthcare sector is a service provider to a variety of stakeholders in Bangladesh, ultimately this study contributes to society and the country as a whole. Originality/value – The study contributes to the sustainability literature relating to healthcare organisations, applying social cognitive theory and the norm activation model to underpin the role PGC, GSE and GOCB play individually and collectively to improve EP through GHRM implementation.

Open Access: Yes

DOI: 10.1108/SRJ-02-2025-0112

Simulation and measurement of magnetic based nondestructive tester

Miklós Kuczmann Gergely Kovács

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2009-12-01

Volume: 85

Issue: 12

Page Range: 76-79

Description:

The paper presents the analysis of a nondestructive testing equipment under investigation. There are three main parts of the research as well as this paper. The first part shows the present state of the developed nondestructive tester based on the Magnetic Flux Leakage (MFL) method, the second part reviews the simulation and the results, which have been made with the principle of the Finite Element method (FEM). The last part presents the measurement results, which have been performed with the nondestructive tester. In this paper the simulation results with the measurement results have been compared.

Open Access: Yes

DOI: DOI not available

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

Near-infrared spectroscopy for rapid evaluation of winter cereals and Italian ryegrass forage mixtures

Tamás Tóth George Bázár Róbert Tóthi Richárd Hoffmann Hedvig Febel László Kacsala Balázs Húth Haruna Gado Yakubu Alemayehu Worku Szilvia Orosz

Publication Name: Animal Science Journal

Publication Date: 2023-01-01

Volume: 94

Issue: 1

Page Range: Unknown

Description:

Near-infrared (NIR) spectroscopy was employed to determine the differences between forage mixtures of winter cereals and Italian ryegrass and to evaluate fermentation characteristics of mixed silages. Forages were harvested on five phases (Cuts 1–5), with 1 week interval (n = 100). The yield of the last harvest (Cut 5) was ensiled and analyzed on four different days (D0, D7, D14, and D90) (n = 80). Principal component analysis based on the NIR data revealed differences according to the days of harvest, differences between winter cereals and Italian ryegrass forages, and differences in the fermentation stages of silages. The partial least square regression models for crude protein (CP), crude fiber (CF), and ash gave excellent determination coefficient in cross-validation (R2CV > 0.9), while models for ether extract (EE) and total sugar content were weaker (R2CV = 0.87 and 0.74, respectively). The values of root mean square error of cross-validation were 0.59, 0.76, 0.22, 0.31, and 2.36 %DM, for CP, CF, EE, ash, and total sugar, respectively. NIR proved to be an efficient tool in evaluating type and growth differences of the winter cereals and Italian ryegrass forage mixtures and the quality changes that occur during ensiling.

Open Access: Yes

DOI: 10.1111/asj.13823