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Found 6414 publications

Optimizing complex building renovation process with fuzzy signature state machines

Gergely Molnarka Laszlo T. Koczy

Publication Name: Lecture Notes in Computer Science Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics

Publication Date: 2014-01-01

Volume: 8835

Issue: Unknown

Page Range: 573-580

Description:

In contrary to recently built office and commercial buildings, the service life of the traditional European residential houses was not calculated. Some estimations exist about the life span of different types of building constructions, however, these estimations may not reassure the owners of urban-type residential houses that were built before the second world war. A thorough and professional renovation may extend the service life of buildings by decades, the question is how to prepare the most effective renovation procedure.As a combination of the fuzzy signature structure and the principles of finite-state machine a new formal method is proposed for generating a tool for supporting the renovation planning, concerning the costs and importance of repair. With the support of information obtained from a given pre-war urban-type residential house, the available technical guides and the contractors’ billing database an optimized renovation process of the roof structure is presented as a case study.

Open Access: Yes

DOI: 10.1007/978-3-319-12640-1_69

OLD AND NEW CHALLENGES IN REGIONAL DEVELOPMENT – COMPARATIVE ANALYSIS OF EUROPEAN REGIONAL DEVELOPMENT POLICY APPROACHES TO IDENTIFYING BENEFICIARY REGIONS

Katalin Mezei Gábor Mayer

Publication Name: Deturope

Publication Date: 2025-01-01

Volume: 17

Issue: 3

Page Range: 50-74

Description:

Most European countries apply development policy solutions to help disadvantaged regions catch up and seek effective solutions for territorial cohesion. This endeavour has been strongly supported by the European Commission in both the 2013-2020 and 2021-27 programming periods and is likely to remain so in the period after 2028. This is an understandable and logical endeavour, as being 'left behind' in economic, social or geographical terms not only reinforces internal migration flows within the European Community and its Member States but also increases political discontent. A number of approaches have emerged in European countries to identify disadvantaged regions and address their problems. The differences stem partly from the different intervention intentions of individual countries and partly from their different spatial, state and public administration structures. Various development policy solutions have been devised to help disadvantaged regions catch up, taking these factors into account. In Hungary, development policy has placed greater emphasis on the catching up of regions and settlements lagging behind in terms of socio-economic development since the 1980s, but the importance of delimitation in development policy practice has increased since the country's accession to the EU, with the establishment of differentiated support resource allocation mechanisms and targeted support programmes. The methodology currently in use for designating beneficiary regions has been in place since 2014. The socioeconomic changes that have taken place since then have shifted the focus of both scientific and policy interest in recent years towards more location-specific regulatory mechanisms that measure development differences at a lower level and are more sensitive to functional links between settlements. To support efforts in the renewal of the Hungarian regional development toolkit, our study seeks to outline alternative options by analysing Italian and British development policy practices, in addition to presenting Hungarian beneficiary regions. The international examples examined, despite their limitations as presented in the study, provide examples of multi-level governance, development policies based on functional units, and methodologies for measuring development below the settlement level. Current legislation in Hungary allows for changes in this direction, but their incorporation into domestic practice is only possible after careful preparation.

Open Access: Yes

DOI: DOI not available

Overall imperfection method for flexure and compression steel beam-columns

Achim Rubert G. Hajdú F. Papp

Publication Name: Stahlbau

Publication Date: 2017-06-01

Volume: 86

Issue: 6

Page Range: 483-496

Description:

Overall imperfection method for flexure and compression steel beam-columns. The principles and applications of the overall (global) imperfection method (OIM) for beam-columns are presented in this paper. The buckling resistance of a beam-column member is determined by the resistance of its critical cross-section taking into account second-order effect of the eigenform equivalent initial imperfection. The maximum amplitude of this initial imperfection, in the shape of elastic buckling mode, is determined from fundamental cases, which are simply fork supported members with uniform cross-section under uniformly distributed normal force or bending moment. The standardized buckling resistance of the fundamental cases is based on theoretical and empirical background. The proposed global imperfection method is adequate for computer-aided design method using advanced elastic beam-column finite element method including the warping behavior of the cross section. The accuracy of the presented method is illustrated step-by-step with numerical examples.

Open Access: Yes

DOI: 10.1002/stab.201710471

The Role and Impact of Digital Transformation in the Development of Professional Teachers' Methodological Culture

Laszlo Kadocsa Gyula Gubán Levente Juhász Gyorgy Molnar

Publication Name: Cando EPE 2024 Proceedings IEEE 7th International Conference and Workshop Obuda on Electrical and Power Engineering

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 171-178

Description:

Today's professional teacher training system includes both professional and pedagogical preparation, the main aim of this training being to further develop the methodological part of the teacher training. In the last three decades, the institutional system and the content of Hungarian VET have been characterised by constant change, significantly influenced by the series of decisions and recommendations on VET in the EU. While continuous structural and content change has updated the VET infrastructure, and modern curricula have been developed, this modernisation has been accompanied by only modest digital and methodological changes. While all the development programmes implemented have made efforts to improve the methodological knowledge of vocational teachers, the results have been less visible in practice. Research on teaching methods and the methodological culture of professional teachers in vocational subjects has been scarcely reported in the professional press. At the same time, the learning environment has changed dramatically over the last decade, and the need for digital education has significantly altered the expectations of teachers in terms of teaching methods. The digital transformation of education is not a digitally-enhanced version of traditional teaching methods, but a new learning environment in terms of approach, requirements, methodology and assessment systems. In our study we want to present an empirical research and its results, as well as new directions for development, which aimed at partially overcoming this methodological gap at the University of Dunaújváros, In this context, we describe in detail the study that was carried out by means of a questionnaire survey and focus group interviews among engineering and vocational students of the institution in 2014 and 2024.

Open Access: Yes

DOI: 10.1109/CANDO-EPE65072.2024.10772873

Domain decomposition method with an interface preconditioner for frictionless contact problem

Lotfi Abdelhakim

Publication Name: Aip Conference Proceedings

Publication Date: 2008-10-22

Volume: 1048

Issue: Unknown

Page Range: 359-363

Description:

The present paper is concerned with the frictionless bilateral or unilateral contact problem between two elastic bodies. An algorithm is introduced to solve the resulting finite element system by a non-overlapping domain decomposition method. This technique enable us to transform the solution of the global problem to the solutions of the elasticity equations for each body separately and the solution of the Schur complement problem on the contact surface. The main goal of this work is the construction of the interface preconditioner for the Schur complement problem. The solution is obtained by using a successive approximation method. Finally, some numerical results of the proposed method are given. © 2008 American Institute of Physics.

Open Access: Yes

DOI: 10.1063/1.2990933

The effect of mold temperature on chemical foaming of injection molded recycled polyethylene-terephthalate

Ferenc Ronkay Bela Molnar Gabor Dogossy

Publication Name: Thermochimica Acta

Publication Date: 2017-05-10

Volume: 651

Issue: Unknown

Page Range: 65-72

Description:

Foam injection molded samples were produced from recycled polyethylene-terephthalate using endothermic and exothermic foaming agents at different mold temperatures. The foam structure was analyzed by computer tomography and optical microscopy. The morphological properties of samples were analyzed by differential scanning calorimetry, using the three-phase model. Viscosities of the melts were changed during processing by endothermic and exothermic foaming agents, and as a result different foam structures were formed. Relationships between mold temperature and porosity were found. Morphologies of the samples made with different foaming agents were different, also due to the different cooling rates caused by the endothermic and exothermic foaming reactions.

Open Access: Yes

DOI: 10.1016/j.tca.2017.02.013

On the development of signatures for Artificial Intelligence applications

Claudiu Radu Pozna Péter Földesi Radu Emil Precup Laszlo T. Koczy

Publication Name: IEEE International Conference on Fuzzy Systems

Publication Date: 2014-09-04

Volume: Unknown

Issue: Unknown

Page Range: 1304-1310

Description:

This paper illustrates developments of signatures for Artificial Intelligence (AI) applications. Since the signatures are data structures with efficient results in modeling of fuzzy inference systems and of uncertain expert systems, the paper starts with the analysis of the data structures used in AI applications from the knowledge representation and manipulation point of view. An overview on the signatures, on the operators on signatures and on classes of signatures is next given. Using the proto fuzzy inference system, these operators are applied in a new application of fuzzy inference system modeled by means of signatures and of classes of signatures.

Open Access: Yes

DOI: 10.1109/FUZZ-IEEE.2014.6891636

Egysejt-fehérje előállítása állati takarmányozáshoz fermentációs biotechnológiával

Renato Kalocsai Mukhtar H. Ahmed Judit Molnár Dávid Vasas Tamás Szakál

Publication Name: Elelmiszervizsgalati Kozlemenyek

Publication Date: 2022-06-30

Volume: 68

Issue: 2

Page Range: 3888-3895

Description:

No description provided

Open Access: Yes

DOI: 10.52091/EVIK-2022/2-3-HUN

Power Injection Method-based Evaluation of the Effect of Binding Technique on the Coupling Loss Factors and Damping Loss Factors in Statistical Energy Analysis Simulations

Dániel Feszty Marcell Treszkai Alexander Peiffer

Publication Name: Manufacturing Technology

Publication Date: 2021-01-01

Volume: 21

Issue: 4

Page Range: 544-558

Description:

Measurement results on the Damping Loss Factor (DLF) and Coupling Loss Factor (CLF) between two steel plates is presented for 19 different junction types. The junctions involve joining technologies, such as line welding, point welding, bolting, riveting, gluing or their combinations, and with varying spacing between the junction points and the angle between the plates. From the measurement results, the DLF and CLF values were calculated by the Power Injection Method for the purposes of being applied in Statistical Energy Analysis simulations. Four excitations were applied at each subsystem by impact hammer, while the response was recorded at sixteen response points at each subsystem. The measured CLF values were compared to each other from various aspects. Data were compared to the results obtained from SEA simulations by using the built-in analytical formulas. In general, good comparison was observed, although the results appeared to be somewhat dependent on the frequency band. Finally, it was examined whether replacing the DLF values with data obtained for an uncoupled flat plate, as well replacing the CLF values with data from analytical formulas leads to acceptable accuracy of the simulation results.

Open Access: Yes

DOI: 10.21062/mft.2021.065