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Publications - 6342

Rényi 100, Quantitative and qualitative (in)dependence

J. Pintz Miklós Arató Gy Michaletzky T. Rudas T. F. Móri G. Tusnády G. J. Székely Gy O.H. Katona

Publication Name: Acta Mathematica Hungarica

Publication Date: 2021-10-01

Volume: 165

Issue: 1

Page Range: 218-273

Description:

We discuss recent developments in the following important areas of Alfréd Rényi’s research interest: axiomatization of quantitative dependence measures, qualitative independence in combinatorics, conditional qualitative independence in statistics/data science and in measure theory/probability theory, and finally, prime gaps that are responsible for Rényi’s early career reputation. Most authors of this paper are main contributors to the new developments.

Open Access: Yes

DOI: 10.1007/s10474-021-01164-4

Age-dependent aerobic capacity among young and middle-aged males

Feren Ihász József Bognár Balázs Fügedi Piroska Boros Peter Szabó Andras Oláh

Publication Name: Gazzetta Medica Italiana Archivio Per Le Scienze Mediche

Publication Date: 2016-03-01

Volume: 175

Issue: 3

Page Range: 68-75

Description:

BACKGROUND: Good aerobic capacity is one of the attributes of good cardiovascular function. Physical activity that is performed in steady state and the lower third zone of submaximal intensity seems appropriate for physiological adaptation in advancing age. There is a need to evaluate the effect of age on physiological variables contributing to aerobic capacity using submaximal intensities. The purpose of this study is to analyze the differences m oxygen uptake, oxygen pulse, and minute ventilation during exercise at steady state, ventilatory threshold, and maximal intensity zones among men of different ages. METHODS: Three hundred and twelve senior managers m three age groups (20-30, 30-40, and 40-50) completed an exercise protocol in six stages. RESULTS: Hie result demonstrated a series of differences among the age groups: height, weight, oxygen uptake, oxygen pulse and relative minute ventilation. Accordmg to these results the morphological physiological variables decline with age. CONCLUSIONS: These findings demonstrate the specificities of the morphological, ventilatory, metabolic, and cardiovascular changes throughout aging. When designing a physical activity program, it seems that similar principles can be followed in different age groups; however, maximal intensity maintenance is limited by physiological barriers m older adults. (Cite this article as: Ihasz F, Boros P, Szabo P. Olah A, Fueedi B. Bognar J. Age-dependent aerobic capacity among young and middle-aged males. Gazz Med Ital - Arch Sci Med 2016;175:68-75).

Open Access: Yes

DOI: DOI not available

Special coginfo application by non-business organizations: Case study on marketing communication of a higher education institution

Márta Konczos Szombathelyi Eszter Petra Majer Szabolcs Ramhap

Publication Name: 6th IEEE Conference on Cognitive Infocommunications Coginfocom 2015 Proceedings

Publication Date: 2016-01-25

Volume: Unknown

Issue: Unknown

Page Range: 483-488

Description:

The aim of this study is to prove that non-business organizations (among them the universities) - increasingly often facing the effects of lack of sources and operating in fierce competition - need to use such marketing systems and IT telecommunication technologies which are applied by profit-oriented sectors. Changes and processes in the field of information technology and telecommunications are fast, wide spread and revolutionary, even aggressive. This analysis is based upon the experiments and data of Service Centre of Széchenyi University. The key findings of this paper is the conclusion that for the higher education institution is vital for applying infocommunication tools for reaching the cognitive entities, the young generations. The paper focuses on the development of communication channels, online communication and social media, furthermore tends to give an overall picture of the rapidly growing role of social media as a tool among Hungarian higher institutions. The financial position of institutions depends more and more on customer behaviour. Customer behaviour has an influence on the higher education market; it has an effect on the choice of institution and also on future target groups. So it is significant for these institutions to pay attention to consumer expectations and communicate effectively with their consumers, using the latest and the most advanced information communication technologies. It is particularly important because the universities' target groups are mostly the Y and Z generations into whose everyday activities modern info communication technologies are embedded. In the frame of our paper we give an overview of the trends and long term features - such as digitalization, info-communication, and social media - on marketing communication tools at Széchenyi University. The case study shows the multifaceted nature of the problem, the range of possible tools and their application. Due to the labour market needs Széchenyi István University strengthens relations with the business sector and broadens the range of teaching and research services provided by them. In the case study we can follow the development of communication channels/instruments; the digital evolution and the phenomenon that the social web has become the most important (strategic) platform for communicating with the young generations; overall trends in interactive communication and online communities, and the emergence of interactive channels; social media, networks and online videos. The universities have to employ professionals with social media skills and they have to create communicating strategies for different generations. We have a real case about how younger "always online" communication professionals formulate the core requirements; and how we can integrate the communication centre with the newest info communication tools, such as mobile communication: applications. We can conclude that as the World Wide Web becomes more and more influential, social media has become the most important tool of marketing communication for universities to reach the public.

Open Access: Yes

DOI: 10.1109/CogInfoCom.2015.7390641

Steady-Speed Traffic Capacity Analysis for Autonomous and Human-Driven Vehicles

Balázs Horváth Dilshad Mohammed

Publication Name: Applied Sciences Switzerland

Publication Date: 2024-01-01

Volume: 14

Issue: 1

Page Range: Unknown

Description:

As the automotive industry transitions towards the era of autonomous vehicles, it is imperative to assess and compare the following distances maintained by vehicles equipped with adaptive cruise control (ACC) systems against those of traditional human-driven vehicles. This study aims to provide insights into the future use of autonomous vehicles by empirically examining the following distances achieved under different driving conditions. Controlled experiments were conducted using three vehicles equipped with various types of ACC sensors, and comparable scenarios were replicated with human drivers. The experiments involved driving at multiple constant speeds to evaluate the efficacy of ACC in maintaining safe following distances. Our findings indicate that ACC systems consistently converge on optimal following distances, demonstrating their ability to regulate spacing between vehicles effectively. However, a notable downside emerged in terms of their adverse impact on road capacities, where the results indicate a mitigation in capacity percentages of 7.6%, 9.3%, and 15.6% for the three types of ACC-equipped vehicles compared to human drivers. This study sheds light on the intricate interplay between ACC systems and human driving behaviors, emphasizing the need to consider both factors when envisioning the future of autonomous vehicles. While ACC systems provide a standardized and reliable approach to following distances, the shorter distances observed in human-driven scenarios suggest a potential trade-off between safety and traffic capacity. These insights contribute to a comprehensive understanding of the dynamics involved in autonomous driving, facilitating informed decision making for the integration of autonomous vehicles into future transportation systems.

Open Access: Yes

DOI: 10.3390/app14010337

Invariance Preserving Discretization Methods of Dynamical Systems

Yunfei Song Tamás Terlaky Zoltán Horváth

Publication Name: Vietnam Journal of Mathematics

Publication Date: 2018-12-01

Volume: 46

Issue: 4

Page Range: 803-823

Description:

In this paper, we consider local and uniform invariance preserving steplength thresholds on a set when a discretization method is applied to a linear or nonlinear dynamical system. For the forward or backward Euler method, the existence of local and uniform invariance preserving steplength thresholds is proven when the invariant sets are polyhedra, ellipsoids, or Lorenz cones. Further, we also quantify the steplength thresholds of the backward Euler methods on these sets for linear dynamical systems. Finally, we present our main results on the existence of uniform invariance preserving steplength threshold of general discretization methods on general convex sets, compact sets, and proper cones both for linear and nonlinear dynamical systems.

Open Access: Yes

DOI: 10.1007/s10013-018-0305-z

Observability Conditions for Speed Sensorless Induction Motor Models with Neglected or Included Iron Loss Representation

Krisztian Horvath

Publication Name: International Conference on Electical Drives and Power Electronics

Publication Date: 2021-01-01

Volume: Unknown

Issue: Unknown

Page Range: 97-101

Description:

Iron loss is usually neglected in induction motor models used for speed sensorless control and observer design. Thus, the complexity of control and estimator algorithms are reduced. However, the application of a more accurate model can improve the performance, hence the inclusion of iron loss in the machine model is becoming more widespread. But the effect of iron loss modeling on observability has not been analyzed yet. In this paper, observability conditions are presented for nonlinear state-space models with included iron loss. Furthermore, the results are compared with the observability properties of the traditional models where iron loss is ignored.

Open Access: Yes

DOI: 10.1109/EDPE53134.2021.9604110

Quantitative determination of protein of bacterial origin

J. Schmidt Zs Csapó-Kiss J. Csapó T. G. Martin

Publication Name: Trac Trends in Analytical Chemistry

Publication Date: 2001-01-01

Volume: 20

Issue: 1

Page Range: 42-48

Description:

Several methods have been developed for the determination of the proportion of nitrogen-containing substances of microbial origin in the digestive tracts of cattle. These include assays that use nucleic acids and adenosine triphosphate as indicators, radioisotopes 35S, 15N, 32P and 33P incorporated into bacterial protein and phospholipids, duodenal amino acid composition with amino-ethylphosphonic acid, diaminopimelic acid and D-alanine (D-Ala) contents as indicators. On the basis of the data in the literature on D-amino acid content of milk and milk products the authors came to the conclusion that D-glutamic acid (D-Glu) and D-aspartic acid (D-Asp) can be considered as markers for proteins of bacterial origin. To demonstrate this, experiments have been carried out and some of the results are reported here. © 2001 Elsevier Science B.V.

Open Access: Yes

DOI: 10.1016/s0167-2940(01)90105-0

Influence of welding thermal cycles on microstructure and impact toughness of high-strength steels: A gleeble simulation study

Mahmood Alhafadhi Lama Mkanna

Publication Name: Journal of Materials Research and Technology

Publication Date: 2026-05-01

Volume: 42

Issue: Unknown

Page Range: 10024-10035

Description:

Weldability of high-strength steels is strongly influenced by welding thermal cycles, particularly through their effect on heat-affected zone (HAZ) microstructure, hardness, and susceptibility to hydrogen-assisted cracking. In this study, six commercially available high-strength steels (S355MC, S500MC, S700MC, S960MC, S960QL, and S1100MC) were investigated using Gleeble physical simulation to reproduce welding thermal cycles with cooling times t8/5 = 5-20 s. Microstructural characterization, hardness measurements, and instrumented Charpy impact testing were performed and complemented by Tekken weldability tests. The results show that thermomechanically controlled processed (TMCP) steels (S355MC, S500MC, and S700MC) exhibit stable transformation behavior, maintaining consistent hardness and toughness across the investigated cooling range. In contrast, steels with yield strengths of 960 MPa and above exhibit a narrow processing window, where rapid cooling promotes the formation of hard martensitic microstructures, while slower cooling leads to grain coarsening and reduced impact toughness. Instrumented Charpy testing revealed a significant decrease in absorbed energy and crack resistance with increasing cooling time. The findings demonstrate that weldability in ultra-high-strength steels cannot be reliably assessed based on hardness alone. A combined evaluation of cooling time, microstructural evolution, hardness, and fracture behavior is required to support the selection of appropriate preheating and welding conditions.

Open Access: Yes

DOI: 10.1016/j.jmrt.2026.05.162

Effects of Cognitive Biases and Their Fuzzy Measure During Freight Transportation

Peter Foldesi Adrian Horváth Eszter Sós

Publication Name: Lecture Notes in Logistics

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: 29-43

Description:

Cognitive biases affect all aspects of our lives, including the decision-making process related to the routing of freight transport. In the process of using human-machine systems, people upload rational and objective algorithms in order to obtain the best possible results in the route planning process. Nevertheless, during the route choice process, human reasoning, based on experience and assumptions, overrides the choice of the machine, that is, cognitive biases appear in the decision-making processes. For this reason, we investigate how an objective system of interests becomes a cognitive bias during the process of making decisions related to the route choice of freight transport by motor vehicle. Furthermore, we present a methodology to estimate fuzzy measures of route-related deviations concerning time and distance, which may be indicative of the emergence of cognitive biases.

Open Access: Yes

DOI: 10.1007/978-3-031-28236-2_3