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Found 6374 publications

Solution procedure of dynamical contact problems with friction

Lotfi Abdelhakim

Publication Name: Aip Conference Proceedings

Publication Date: 2017-07-21

Volume: 1863

Issue: Unknown

Page Range: Unknown

Description:

Dynamical contact is one of the common research topics because of its wide applications in the engineering field. The main goal of this work is to develop a time-stepping algorithm for dynamic contact problems. We propose a finite element approach for elastodynamics contact problems [1]. Sticking, sliding and frictional contact can be taken into account. Lagrange multipliers are used to enforce non-penetration condition. For the time discretization, we propose a scheme equivalent to the explicit Newmark scheme. Each time step requires solving a nonlinear problem similar to a static friction problem. The nonlinearity of the system of equation needs an iterative solution procedure based on Uzawa's algorithm [2][3]. The applicability of the algorithm is illustrated by selected sample numerical solutions to static and dynamic contact problems. Results obtained with the model have been compared and verified with results from an independent numerical method.

Open Access: Yes

DOI: 10.1063/1.4992771

Computer-aided analysis of phisiological systems

Balázs Benyó

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2007-12-01

Volume: 4

Issue: 4

Page Range: 55-68

Description:

This paper presents the recent biomedical engineering research activity of the Medical Informatics Laboratory at the Budapest University of Technology and Economics. The research projects are carried out in the fields as follows: Computer aided identification of physiological systems; Diabetic management and blood glucose control; Remote patient monitoring and diagnostic system; Automated system for analyzing cardiac ultrasound images; Single-channel hybrid ECG segmentation; Event recognition and state classification to detect brain ischemia by means of EEG signal processing; Detection of breathing disorders like apnea and hypopnea; Molecular biology studies with DNA-chips; Evaluation of the cry of normal hearing and hard of hearing infants.

Open Access: Yes

DOI: DOI not available

Safety against bearing resistance failure of spread foundation using reliability method

Adam Bukovics

Publication Name: Pollack Periodica

Publication Date: 2007-08-01

Volume: 2

Issue: 2

Page Range: 51-62

Description:

The aim of this research work is the analysis of the dimensioning of EC's of the vertical bearing structures of buildings, within the framework. In the beginning the bearing resistance of spread foundation is analyzed. The aim is to evaluate the method of EC-7 in the light of the safety to be demanded according to the current standard and reliability method. The current work describes the opportunity of determining this latter. © 2007 Akadémiai Kiadó.

Open Access: Yes

DOI: 10.1556/Pollack.2.2007.2.5

Fuzzy neural networks stability in terms of the number of hidden layers

László Gál Rita Lovassy Laszlo T. Koczy Imre J. Rudas

Publication Name: 12th IEEE International Symposium on Computational Intelligence and Informatics Cinti 2011 Proceedings

Publication Date: 2011-12-01

Volume: Unknown

Issue: Unknown

Page Range: 323-328

Description:

This paper introduces an approach for studying the stability, and generalization capability of one and two hidden layer Fuzzy Flip-Flop based Neural Networks (FNNs) with various fuzzy operators. By employing fuzzy flip-flop neurons as sigmoid function generators, novel function approximators are established that also avoid overfitting in the case of test data containing noisy items in the form of outliers. It is shown, by comparing with existing standard tansig function based approaches that reducing the network complexity networks with comparable stability are obtained. Finally, examples are given to illustrate the effect of the hidden layer number of neural networks. © 2011 IEEE.

Open Access: Yes

DOI: 10.1109/CINTI.2011.6108523

Encountering the cognitive and noetic endeavors of macedon renaissance : PPart IV: Pictures of clemens and constantine VII on the coronation mandle (Royal Casula) and holy crown of st stephen of Hungary. Revisiting the phanes symbolism

Peter Varlaki Judit Ida Steiner-Varlaki Péter Baranyi

Publication Name: 11th IEEE International Conference on Cognitive Infocommunications Coginfocom 2020 Proceedings

Publication Date: 2020-09-23

Volume: Unknown

Issue: Unknown

Page Range: 553-562

Description:

The paper discusses artifacts of Royal (Coronation) Robe (Casula) of St Stephen of Hungary concerning the picture of the St Cement (Clemens) and Constantine Porphyrogenitus on the Holy Crown in the style of the Macedonian Renaissance representing noetic and pneumatic experiences renewing the traditional Christian interpretations. Here the main purpose of the paper upon the fascinating Artifact is the explanation of the historical and structural background in the old Greek noetic and mystical Israelite-Judaic pneumatic tradition for the new kind of the Christian Asterisk-disc eucharistic liturgy, here using the known patterns of Phanes Mythologems.

Open Access: Yes

DOI: 10.1109/CogInfoCom50765.2020.9237846

Efficient numerical models for electro-mechanical analysis

Lotfi Abdelhakim

Publication Name: Aip Conference Proceedings

Publication Date: 2011-11-28

Volume: 1389

Issue: Unknown

Page Range: 1996-1999

Description:

In this paper, we present a numerical procedure that can be used to model the electro-mechanical coupled behavior of the dielectric actuator domain. The equation describing the electrostatical part is given by the reduced form of the Maxwell equation and the electrostatic potential [1]. The mechanical problem is described by the constitutive equations and equilibrium equations. Using the finite element method, this technique is to divide a whole problem into sub-problems. The complexity of the original problem is therefore reduced by focusing only on areas most relevant. A finite element analysis is then performed by applying the electrostatic Maxwell pressure as Neumann boundary conditions to compute the displacements. Once the displacement is computed, the electrostatic domain or the conductor is updated. Electrostatic analysis is performed on the updated geometry and the finite element method is then used to determine the change in potential due to geometric perturbations. Once the surface charge densities are known, the new electrostatic Maxwell pressure is computed. The mechanical and electrostatic analysis is repeated until an equilibrium state is computed. The procedure is demonstrated in the paper by the solution of some two-dimensional and three-dimensional problems. © 2011 American Institute of Physics.

Open Access: Yes

DOI: 10.1063/1.3637006

Sustainability Objectives and Central Banks

András Lapsánszky Gábor Hulkó János Kálmán

Publication Name: Chemical Engineering Transactions

Publication Date: 2023-01-01

Volume: 107

Issue: Unknown

Page Range: 331-336

Description:

This article examines how addressing climate-related risks and supporting mitigation and adaptation policies fit into central bank mandates. According to this goal, the research conducts an empirical examination of current central bank mandates to investigate the extent to which central banks are equipped with objectives that task them to enhance sustainability and mainstream green finance. The analysis of mandates and objectives using the IMF’s Central Bank Legislation Database. Out of 159 IMF member countries and monetary unions, only 12 % have explicit sustainability mandates, while 33 % are mandated to support the government’s policy priorities, which mostly include sustainability goals. The research concludes that it should be clear that climate change and mitigation policies will have very profound impacts on economies, with potentially significant implications for price, macroeconomic, and financial stability. These need to be tackled by central banks as part of their core responsibilities. A central bank that does not address climate risks is failing to do its job.

Open Access: Yes

DOI: 10.3303/CET23107056

Assessing the Paradox of Autonomous Vehicles: Promised Fuel Efficiency vs. Aggregate Fuel Consumption

Balázs Horváth Dilshad Mohammed

Publication Name: Energies

Publication Date: 2024-04-01

Volume: 17

Issue: 7

Page Range: Unknown

Description:

As autonomous vehicles (AVs) continue to evolve and approach widespread adoption in the near future, the touted benefits of improved fuel efficiency at an individual level come under scrutiny when considering the overall impact on fuel consumption. This research delves into the paradoxical relationship between the promising technology of AVs, their impact on traffic capacities, travel demand, and the subsequent influence on aggregate fuel consumption. While AVs have demonstrated enhanced fuel efficiency when considered as a singular mode of transportation, our study reveals a contrasting trend when scaled to a broader societal context. Through comprehensive analysis of the literature, we discovered that, at lower limits of energy savings achievable by a single AV, the overall fuel consumption increases by a staggering 42% compared to conventional human-driven vehicles. This counterintuitive outcome is a result of the aggregate effect of increased AV usage, leading to higher traffic volumes and travel demands. Conversely, at higher thresholds of energy savings by individual AVs, the percentage of fuel consumption increment diminishes, but remains notable. Even with advanced energy-saving features, the overall fuel quantity still experiences a substantial 30% increase compared to conventional vehicles when scaled up to widespread AV use. Our findings emphasize the importance of considering the holistic impact of AVs on transportation systems and energy consumption. As society transitions towards AV-dominated traffic, policymakers and stakeholders must address the challenges associated with increased travel demand, potential traffic congestion, and the resultant implications on fuel consumption.

Open Access: Yes

DOI: 10.3390/en17071589

Hybrid Bacterial Iterated Greedy heuristics for the Permutation Flow Shop Problem

Krisztián Balázs Laszlo T. Koczy Zoltán Horváth

Publication Name: 2012 IEEE Congress on Evolutionary Computation CEC 2012

Publication Date: 2012-10-04

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

This paper proposes approaches for combining the Iterated Greedy (IG) technique, as a presently state-of-the-art method, with a recently proposed adapted version of the Bacterial Evolutionary Algorithm (BEA) in order to efficiently solve the Permutation Flow Shop Problem. The obtained techniques are evaluated via simulation runs carried out on the well-known Taillard's benchmark problem set. Based on the experimental results the hybrid methods are compared to each other and to the original techniques (i.e. to the original IG and BEA algorithms). © 2012 IEEE.

Open Access: Yes

DOI: 10.1109/CEC.2012.6256167