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Publications - 6278

Robot cooperation without explicit communication by fuzzy signatures and decision trees

Tamás D. Gedeon Áron Ballagi László T. Kóczy

Publication Name: 2009 International Fuzzy Systems Association World Congress and 2009 European Society for Fuzzy Logic and Technology Conference Ifsa Eusflat 2009 Proceedings

Publication Date: 2009-12-01

Volume: Unknown

Issue: Unknown

Page Range: 1468-1473

Description:

This paper presents a novel action selection method for multi robot task sharing problem. Two autonomous mobile robots try to cooperate for push a box to a goal position. Both robots equipped with object and goal sensing, but do not have explicit communication ability. We explore the use of fuzzy signatures and decision making system to intention guessing and efficient action selection. Virtual reality simulation is used to build and test our proposed algorithm.

Open Access: Yes

DOI: DOI not available

Policy priorities for improving Global Innovation Index score and innovative performance in upper-middle-income countries: Implications for Armenia

Gayane Tovmasyan Svitlana Bilan Hamlet Mkrtchyan Anna Makaryan Svetlana Dallakyan Verej Isanians Harutyun Sargsyan

Publication Name: Problems and Perspectives in Management

Publication Date: 2025-01-01

Volume: 23

Issue: 1

Page Range: 569-583

Description:

As an upper-middle-income country, Armenia should develop and implement targeted policies, such as increased R&D investments, education reforms, and industry-academia collaboration, to enhance its innovation performance. Strengthening these areas is expected to contribute to higher Global Innovation Index (GII) rankings, reflecting improved national innovation capacity. This study aims to estimate the impact of various GII components (including pillars, sub-indices, and sub-pillars) on the overall GII and pillar scores for upper-middle-income countries. Based on these findings, the study seeks to identify Armenia’s key policy priorities and provide targeted recommendations for enhancing its innovation performance. This study employs a cross-sectional regression to analyze the factors influencing GII scores in upper-middle-income countries, assessing the impact of sub-indices, pillars, and sub-pillars. The analysis reveals that market sophistication and creative outputs strongly influence GII scores among upper-middle-income countries, contributing significantly to national innovation performance. Additionally, knowledge and technology outputs, human capital and research, and infrastructure pillars show a statistically significant impact at the 5% level. Notably, even minor improvements in innovation output sub-index scores account for substantial variations in GII rankings. These findings suggest that Armenia should prioritize targeted education reforms, increase R&D investment, and strengthen university-industry linkages to enhance its innovation ecosystem and improve its global competitiveness.

Open Access: Yes

DOI: 10.21511/ppm.23(1).2025.43

Desktop VR as a virtual workspace: A cognitive aspect

Borbála Berki

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2019-01-01

Volume: 16

Issue: 2

Page Range: 219-231

Description:

This paper explores the benefits of using a desktop VR as a virtual workspace. Forty-nine participants data included in this study. With a between-subjects design, we compared the use of extra information between a desktop VR (23 people) and a web browser (26 people). Their tasks were to solve numerical tasks and write the results in a separate spreadsheet. They could follow their performance (solved task / all tasks) on a graph. Then, they filled out a questionnaire where they had to estimate their performance, and indicate the source of this estimation (the only valid source was the provided graph). In the subsample of those who used the graph, the members of the VR group estimated significantly more accurately their performance than the members web browser group. Therefore, the 3D desktop VR workspace can provide benefits to its users by displaying extra information permanently.

Open Access: Yes

DOI: 10.12700/APH.16.2.2019.2.13

MOMENTARY ISOLATION BETWEEN CONTEXTS

B. Bach Péter Wesselényi Garay Andor

Publication Name: Metszet

Publication Date: 2025-01-01

Volume: 16

Issue: 1

Page Range: 8-17

Description:

"The Cube," in Győr, Hungary, appears isolated but is deeply connected to the city's history. Built in 1976, it was integral to the biscuit factory until its 2009 closure. Now, The Cube serves as an anchor within the Győr Science Park, its transformation preserving the original structure while adding an extra layer. This repurposing highlights questions of architectural autonomy and context, as the building's social significance persists despite changing physical surroundings. The Cube's evolution embodies a dialogue between past and future, symbolizing both Győr's industrial heritage and its future as an innovation hub.

Open Access: Yes

DOI: 10.33268/Met.2025.1.1

Numerical estimation method of orthotropic material properties of a roving for reinforcement of composite materials

Béla M. Csizmadia Gergely Bojtár János Égert

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2016-01-01

Volume: 13

Issue: 6

Page Range: 163-182

Description:

Knowledge of the material properties is important at machine design from composite materials. This information cannot be found in related literature and is not standard, therefore, it was necessary to determine, by measurements and by basic experiments of the mechanics of materials. This paper presents a new 3D finite element (FE) model-cell for the modeling of the material properties of a roving. By this numerical modeling method, one can determine the orthotropic and macroscopic material properties of a roving. This model-cell, models numerically, a roving, which consists of multiples of thousands of fibers that are embedded in a matrix material, as a homogenized orthotropic material. The numerical results of the material properties of the roving, can be applied to the definition of the macroscopic material properties of fiber reinforced composite laminates.

Open Access: Yes

DOI: DOI not available

Dimensioning of the reinforced concrete structures old and new presrciptions in Hungary

Csaba Kegyes

Publication Name: Proceedings of the Fib Symposium 2003 Concrete Structures in Seismic Regions

Publication Date: 2003-01-01

Volume: Unknown

Issue: Unknown

Page Range: 264-265

Description:

No description provided

Open Access: Yes

DOI: DOI not available

SCHEDULING OF WASTE WOOD PROCESSING FACILITIES WITH OVERLAPPING JOBS

Máté Hegyháti Balazs David Olivér Osz

Publication Name: Proceedings of the 16th International Symposium on Operational Research in Slovenia Sor 2021

Publication Date: 2021-01-01

Volume: Unknown

Issue: Unknown

Page Range: 321-326

Description:

An important phase in most waste wood value chains is the processing of bulk waste from various sources, usually by means of shredding. This paper presents a method for scheduling the machines in such a waste wood processing facility, where incoming deliveries of different types of wood are processed by a series of treatment and transformation steps to produce shredded wood. A mathematical model is presented for the problem, that allows overlaps between consecutive steps to optimize resource flow through the system. The efficiency of the model is presented on randomly generated instances.

Open Access: Yes

DOI: DOI not available

Determination of Natural Frequencies with Acoustic Methods and their Relation to Residual Stress

Zoltán Weltsch Alexandra Kiri

Publication Name: Advances in Science and Technology

Publication Date: 2025-01-01

Volume: 165 AST

Issue: Unknown

Page Range: 199-204

Description:

There are number of different methods and procedures in vibration analysis, where the natural frequencies of the specimen or the system are one of the key parameters. It is known that these frequencies can change under load, for example in response to pre-stressing, but the effect of residual stresses is less known. By developing a suitable method, natural frequencies can be used to predetermine residual stress, therefore this method can be used for example predicting whether it will cause deformation during machining of a part, whether it requires increased attention or how to set the parameters well for vibratory stress relief. The results can be significant cost and time savings, as well as the improvements of the quality. Natural frequency is the frequency of free vibration of an undamped linear vibration system, or in other words at which a system left alone will vibrate after excited by an external force [1]. Metal castings or welded structures may have several natural frequencies which appear as frequency bands or ranges on the measurement images. Based on these, to determine the natural frequency of a component or system, we need to excite a frequency as close as possible to the natural frequency for the resonance to occur. When the resonance is reached, the amplitude of the system is at its maximum, and the natural frequencies of the workpiece can be measured. Traditionally, sensors, usually accelerometers are used to measure the natural frequency. The continuous development of information technology has made it possible to replace these sensors with an acoustic diagnostic system. During this research, we have developed an acoustic diagnostic system and procedure, which can generate the acoustic measurement images. We have evaluated the measurement images in many ways, and many different types of components and materials (mostly iron alloys) were analyzed. In addition, the changes of natural frequencies show a similar pattern in the case of parts before treating with vibratory stress relief as for load tests.

Open Access: Yes

DOI: 10.4028/p-e4cRIL

Can automatic reactions mirror exercise dependence?

Benjamin Gardner Amanda L. Rebar Boris Cheval Matthew W. Miller Anaïs Quossi Layan Fessler Silvio Maltagliati David Sander Attila Szabo

Publication Name: International Journal of Sport and Exercise Psychology

Publication Date: 2025-01-01

Volume: 23

Issue: 7

Page Range: 1207-1233

Description:

While physical activity (PA) has numerous health benefits, in rare cases it can become addictive and lead to adverse health effects. Automatic reactions to addiction-related cues are a hallmark of addiction, however, their association with exercise dependence (ED) remains unknown. This research examined the links between ED and automatic reactions to PA-related cues in physically active individuals with low-to-moderate levels of ED through two studies. Study 1 (N = 65) used a dot-probe task with eye-tracking to assess the association between attentional bias toward PA and ED scores measured by the Exercise Dependence Scale-Revised. Study 2 (N = 125) used a manikin task and a single-category implicit association test to examine the association of approach-avoidance tendencies and implicit affective attitudes toward PA with ED scores. Results revealed ED scores were positively associated with behavioral indicators of attentional bias (i.e., reaction times), but not with eye-tracking indicators (i.e., first-gaze localization, gaze duration). Similarly, ED scores were unrelated to approach-avoidance tendencies or implicit affective attitudes toward PA. Therefore, our research provides limited evidence supporting the hypothesis that automatic reactions to PA may reflect a “signature” of ED. Our findings do not robustly support the link between automatic processes and ED, raising questions about whether the psychological mechanisms involved in ED might differ from those observed in other addictive behaviors where automatic processes are key. However, due to our sample's low-to-moderate levels of ED, definitive conclusions cannot be drawn. Further research with individuals exhibiting addiction-related dependence, personalized stimuli, and neurophysiological methods is needed.

Open Access: Yes

DOI: 10.1080/1612197X.2024.2387698