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Found 6374 publications

Effects of Local Soil Profiles on Seismic Site Response Analysis

Ayele Chala R. P. Ray

Publication Name: Periodica Polytechnica Civil Engineering

Publication Date: 2024-03-18

Volume: 68

Issue: 2

Page Range: 403-410

Description:

Local soil conditions play a significant role in the intensity variations of seismic waves during earthquakes. These variations can be either amplified or de-amplified depending on the specific soil conditions. This study aimed to assess the impact of different soil profiles on seismic site responses. The study considered four types of site profiles: sand (Sa), clay (Cl), sand overlying clay (SaCl), and clay overlying sand (ClSa) profiles. To simulate the ground motion, we selected seven sets of strong earthquake records from the European Strong-Motion Database. These records were selected according to Eurocode-8 with a peak ground acceleration (PGA) of 0.24 g, site class A using REXEL computer program. The records were then applied to the bedrock at a depth of 30 meters. Subsequently, a series of 1-D equivalent linear (EQL) response analyses were performed using the STRATA. Amplification factors (AFs) and surface acceleration time histories provided quantitative evaluations for our analysis results. The results demonstrated that site profiles with clay overlying bedrock (SaCl and Cl profiles) exhibited higher seismic amplification and peak ground acceleration in comparison to site profiles with sand overlying bedrock (Sa and ClSa profiles). The maximum median AF is calculated from the SaCl site profile, while the minimum median AF was calculated from the ClSa profile. The relative difference between the maximum and the minimum median AFs was about 33.7%. Based on these results, we can conclude that soft local soils have a pronounced effect on the amplification of seismic waves compared to stiff local soils.

Open Access: Yes

DOI: 10.3311/PPci.22148

Accreditation of forensic laboratories as a part of the “European Forensic Science 2020” concept in countries of the Visegrad Group

Mónika Nogel Gabor Kovacs Zsolt Pádár

Publication Name: Forensic Science International Genetics Supplement Series

Publication Date: 2015-12-01

Volume: 5

Issue: Unknown

Page Range: e412-e413

Description:

Globalising, cross-border crime has led EU Member States to improve methods of fighting crime on an international level as well as to increase the mutual recognition of collecting and analysing evidence by one another. In the interest of the regulated and scheduled implementation of the harmonization process, the Council of the EU made a decision of The Vision for European Forensic Science 2020 including the creation of a European Forensic Science Area and the development of forensic science infrastructure in Europe [EFSA 2020] to ensure the equivalence of professional forensic examinations. The collection, processing, use and delivery of forensic data will be based on equivalent minimum forensic science standards, and forensic service providers will work on the basis of a common approach to implement these standards that foster closer cooperation between them and criminal justice systems. The accreditation of forensic laboratories is a corner stone of the above mentioned objectives [1–3]. Ensuring the integrity of DNA profiles the Council issued decision 2008/616/JHA the application of EN ISO/IEC 17025 standard regarding the operation of testing and calibration laboratories has been ordered [4]. According to Council Framework Decision 2009/905/JHA on the accreditation of judicial expert laboratories, the laboratories have to be accredited until 30th November 2015 [5]. We investigated the regulations, decisions and rules national and international measures of the given area.

Open Access: Yes

DOI: 10.1016/j.fsigss.2015.09.163

Beer game - Demonstration and performance evaluation of supply chains

Diána Strommer Norina Szander Péter Bajor

Publication Name: Proceedings of the European Conference on Games Based Learning

Publication Date: 2014-01-01

Volume: 2

Issue: Unknown

Page Range: 732-741

Description:

Professionals need special skills in supply chain management to perform all the required tasks - organising material and information flow, product development, forecasting, customer services and relations, warehousing, decision making and performance measurement. The scientific literature and empirical studies show consistently that in addition to this complex frame of operations the bullwhip effect is presence in every case. This expensive phenomena is hard to detect and measure, and able to cause serious problems in the chains. We consider the game based learning is an effective way to gain experiences rather than acquire only the theoretical background. The beer game as supply chain simulation is widely accepted in the demonstration of system dynamics and investigations of bullwhip effect. Considering the advantages and drawbacks of the numerous versions of the game we created android software for the trainings. The paper based training is hard to follow, in the boardgame the participants can't satisfy the basic rule of not sharing any information and the online version won't make the common/group learning possible. Our training use the beer game simulation connected with the Balanced Scorecard measurement system helps the participants to develop skills in recognition of the bullwhip effect, being familiar with the triggers and impacts, have tools for mitigation and the skill of choosing or designing solutions in the specific cases. The participants can study the theories, evaluate several inventory and order strategies and they also get instant feedback on the impact of their decisions.

Open Access: Yes

DOI: DOI not available

Primal domain decomposition method with direct and iterative solver for circuit-field-torque coupled parallel finite element method to electric machine modelling

Miklós Kuczmann Daniel Marcsa

Publication Name: Advances in Electrical and Electronic Engineering

Publication Date: 2015-12-01

Volume: 13

Issue: 5

Page Range: 458-465

Description:

The analysis and design of electromechanical devices involve the solution of large sparse linear systems, and require therefore high performance algorithms. In this paper, the primal Domain Decomposition Method (DDM) with parallel forward-backward and with parallel Preconditioned Conjugate Gradient (PCG) solvers are introduced in two-dimensional parallel time-stepping finite element formulation to analyze rotating machine considering the electromagnetic field, external circuit and rotor movement. The proposed parallel direct and the iterative solver with two preconditioners are analyzed concerning its computational efficiency and number of iterations of the solver with different preconditioners. Simulation results of a rotating machine is also presented.

Open Access: Yes

DOI: 10.15598/aeee.v13i5.1410

Data representation in HOSVD-DCT based domain

András Rövid Peter Varlaki Lászlõ Szeidl

Publication Name: Ines 2013 IEEE 17th International Conference on Intelligent Engineering Systems Proceedings

Publication Date: 2013-12-12

Volume: Unknown

Issue: Unknown

Page Range: 103-106

Description:

The paper describes an approach for data representation and processing in the so called HOSVD-DCT based domain which combines the higher order singular value decomposition (HOSVD) with the discrete cosine transformation (DCT). The key idea is to express the multivariate function by an orthonormal set of one variable specific functions and perform DCT on those components which are less significant from the application point of view in order to ensure finer grained processing. It is advantageous also in case of system identification, where the behaviour of the system can be approximated by blending locally identified models. In this case the proposed method can efficiently be applied. © 2013 IEEE.

Open Access: Yes

DOI: 10.1109/INES.2013.6632791

Analytical Study of Steel-Polypropylene Hybrid Fibre-Reinforced Concrete Deep Beams with Different Shear Span-to-Depth Ratios

Majid Movahedi Rad Sarah Khaleel Ibrahim

Publication Name: Advances in Transdisciplinary Engineering

Publication Date: 2024-01-01

Volume: 59

Issue: Unknown

Page Range: 406-414

Description:

This study explores the performance of steel-polypropylene hybrid fibrereinforced concrete deep beams across various shear span-to-depth ratio values. Combining the ductility of steel fibres with the crack control properties of polypropylene fibres, the research includes experimental work and numerical calibration using ABAQUS. Various parameters, including load locations and shear span-to-depth ratios (0.5 < a/d < 1.5), are considered alongside different steelpolypropylene fibre ratios. The results indicate that reducing the shear span-to-depth ratio enhances the shear strength of the deep beams and reduces deflection values. additionally, the steel-polypropylene fibres influence the overall behaviour, affecting the load-deflection behaviour and damage patterns highlighting insights for designing efficient deep beams in practical applications.

Open Access: Yes

DOI: 10.3233/ATDE240573

The impact of data accuracy for efficient and feasible routing plans

Adrian Horváth

Publication Name: Urban Freight Transportation Systems

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: 101-114

Description:

Today, more and more problems, such as labor shortages, customer expectations, strict legal environment, and traffic jams, are challenging logistics service providers. Based on practical experience, a prerequisite for efficient distribution is the accurate routing. For this, however, it is essential to use accurate data. This chapter summarizes and presents the most important data needed for efficient routing and the accuracy classes of data. Then, through an example of a logistics service provider’s data, it details the required data and their typical accuracy. With this data and the widely used routing software Paragon, the results of the routing will be compared. Finally, this chapter summarizes the relationship between the accuracy of the data and the usability of the plans. On this basis, proposals for logistics service providers to support efficient operation are made.

Open Access: Yes

DOI: 10.1016/B978-0-12-817362-6.00006-9

A survey of assistive technologies and applications for blind users on mobile platforms: a review and foundation for research

Adam Csapo Hunor Nagy Gyorgy Wersenyi Tony Stockman

Publication Name: Journal on Multimodal User Interfaces

Publication Date: 2015-12-01

Volume: 9

Issue: 4

Page Range: 275-286

Description:

This paper summarizes recent developments in audio and tactile feedback based assistive technologies targeting the blind community. Current technology allows applications to be efficiently distributed and run on mobile and handheld devices, even in cases where computational requirements are significant. As a result, electronic travel aids, navigational assistance modules, text-to-speech applications, as well as virtual audio displays which combine audio with haptic channels are becoming integrated into standard mobile devices. This trend, combined with the appearance of increasingly user-friendly interfaces and modes of interaction has opened a variety of new perspectives for the rehabilitation and training of users with visual impairments. The goal of this paper is to provide an overview of these developments based on recent advances in basic research and application development. Using this overview as a foundation, an agenda is outlined for future research in mobile interaction design with respect to users with special needs, as well as ultimately in relation to sensor-bridging applications in general.

Open Access: Yes

DOI: 10.1007/s12193-015-0182-7

The Role of Demand-Responsive Transport Systems in Sustainable Urban Mobility: A Systematic Literature Review and Stakeholder Analysis †

Adhie Prayogo Boglárka Eisingerné Balassa László Buics

Publication Name: Engineering Proceedings

Publication Date: 2024-01-01

Volume: 79

Issue: 1

Page Range: Unknown

Description:

On-demand transportation, such as demand-responsive public transit (DRT), is gaining prominence as a mobility service tailored to passengers’ needs, offering flexibility in routes, pick-up/drop-off locations, and timing. This study aims to delve into the challenges and technological advancements within the DRT system, focusing on its application and effectiveness in various European Union states. The research first applied a systematic literature review using the PRISMA methodology with a PEO framework. Then, the research aims to provide information on how demand-responsive transportation operates in Central Eastern European countries by collecting and analyzing the characteristics of DRT service processes with a business process modeling approach. The findings aim to inform policymakers and stakeholders about the effectiveness and potential of DRT systems, facilitating informed decision making and policy formulation.

Open Access: Yes

DOI: 10.3390/engproc2024079040