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Found 6327 publications

The Role of Public Transport in Transport Safety and Public Safety

Agoston Winkler Diána Henézi

Publication Name: Eurasia Proceedings of Science Technology Engineering and Mathematics

Publication Date: 2023-01-01

Volume: 23

Issue: Unknown

Page Range: 505-512

Description:

Public transport has a significant role in sustainable urban transport including the reduction of congestion, noise and air pollution. The main purpose of this paper is to present other important impacts of public transport i.e., the improvement of transport safety and public safety, too. Public transport is one of the safest transport modes according to the indication numbers in traffic accident and injuries. This phenomenon is illustrated through literature research as well as statistical data. Further opportunities are presented with a case study based on the transport system of the city of Győr, especially the positive impacts of the possible expansion of night public transport services. The severity of traffic accidents at nights is significant, and the enhancement of public safety is outstanding. Marketing is one of the most important tools for attitude formation, the paper contains some suggestions in this regard as well as in order to promote the goals above.

Open Access: Yes

DOI: 10.55549/epstem.1374907

Detecting and Locating Signal Leakages from Cable TV Networks – A Case Study

Péter Vári Hussein Taha

Publication Name: International Journal of Electronics and Telecommunications

Publication Date: 2023-01-01

Volume: 69

Issue: 3

Page Range: 529-536

Description:

Since the digitalization of terrestrial television, many countries have discontinued television broadcasting in the UHF band. The freed-up frequencies are now available as digital dividends for mobile and fixed wireless access communication networks (MFCN), particularly for 4G/5G and public safety services in broadband called BBPPDR. Since cable TV still uses the UHF band, leakage from cable TV networks is the most common cause of interference in MFCN networks. Insufficient containment of the radio frequency signals transmitted through a cable system results in cable signal leakage. This article investigates the significance of controlling electromagnetic signal leaks from cable TV networks and how they impact authorized and standardized MFCN networks in the digital dividend bands. The periodic drive-test approach to detect and measure electromagnetic leakage from a cable TV system in the 700 MHz band at a site is detailed. The causes of the detected leaks and offered the appropriate procedure to repair them are also discussed. Additionally, the current measures taken in Hungary to address cable television signal leakage in the digital dividend bands are also discussed and alternative strategies for the adopted test drive approach are proposed.

Open Access: Yes

DOI: 10.24425/ijet.2023.146502

On the Impact of Packet Reordering in MPT-GRE Multipath Networks

Naseer Al-Imareen Gábor Lencse

Publication Name: 2023 46th International Conference on Telecommunications and Signal Processing Tsp 2023

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: 82-86

Description:

Several factors, such as network delays, congestion, differing path lengths, and varied processing durations at intermediary nodes, can cause out-of-order arrival of the packets, negatively affecting network performance, decreasing throughput, and increasing latency. When packets arrive out of order, the receiver may need to wait for missing packets before assembling a complete message, resulting in additional delays. Furthermore, some applications, like music and video streaming, require continuous and ordered data flow. Any out-of-order arrival of packets can result in jitter and decreased quality. To mitigate the impact of this issue in MPT-GRE multipath networks, MPT contains a packet reordering mechanism. In this paper, we designed a network topology that generated delays and limited the transmission speed on one of the paths. We investigated how the out-of-order arrival of packets influences the throughput aggregation capability of the MPT library with and without enabling the packet reordering feature of MPT. Our network throughput measurements show that by enabling MPT's packet reordering mechanism, MPT can efficiently aggregate the throughput of both symmetric and asymmetric channels.

Open Access: Yes

DOI: 10.1109/TSP59544.2023.10197737

Generalized Objective Function to Ensure Robust Evaluation for Evolutionary Storage Location Assignment Algorithms

Tamás Bódis Polina Görbe

Publication Name: Communications in Computer and Information Science

Publication Date: 2023-01-01

Volume: 1864 CCIS

Issue: Unknown

Page Range: 546-559

Description:

The efficiency of warehouse operations can be measured by various indicators, but the main one is the lead time, which is heavily influenced by the order picking, as this is the most time- and labor-intensive process in the warehouse operation. In order to reduce lead times, many researchers are working on the topic of Storage Location Assignment Problem (SLAP) The optimized SLA is designed to improve picking efficiency, so that the picker does not have to travel long distances unnecessarily in a picker-to-parts system. During the optimization process, it is necessary to evaluate the SLA in an appropriate way, on the basis of which it is possible to measure whether the objectives are approximated by the results or not. It is also very important to evaluate regularly the SLA during the period after optimization to get an up-to-date information about the assignment of the storage items. The results of regular evaluations can be used to check whether the SLA is effective and lead times are good or whether optimization and reassignment is necessary. Based on studies and experience, SLAs are reassessed and optimized following significant inefficiencies, resulting in relocation tasks and additional work and costs for warehouses. The authors’ research concept includes avoiding large-scale relocation tasks by continuously review the SLA. While other studies evaluate the optimized SLA by running picking lists, but it usually would be necessary to get information about the assignment of the entire warehouse. Furthermore, since assigning thousands of items to thousands of positions is a huge combinational problem, evolutionary algorithm would be necessary to apply. It is also requiring time-effective and generalized individual evolution method to make us possible tactical SLA optimization. The aim of this paper is to describe a novel generalized SLA evaluation method where each of the located items is evaluated to obtain a more accurate optimization result. Furthermore, unlike other research, the aim is to ensure that the optimization concept and the evaluation method are not only specified for one warehouse but can be used in other warehouses as well.

Open Access: Yes

DOI: 10.1007/978-3-031-41774-0_43

Validation of finite element connection modeling by comparison of experimental and virtual power injection methods

Dániel Feszty Marcell Treszkai David Sipos

Publication Name: Journal of Vibroengineering

Publication Date: 2023-01-01

Volume: 25

Issue: 1

Page Range: 209-225

Description:

There are several ways to obtain the matrix of damping loss factors and coupling loss factors for Statistical Energy Analysis. The most recent approach is Virtual SEA, where the Power Injection Method is performed virtually on a finite element model. In order to validate this approach, the most common connection types are investigated in this paper through an L-junction of two coupled steel plates. Virtual SEA and experimental Power Injection Method results are compared in a bent, line welded, superglued and spotwelded variants. The respective finite element connection representation is also validated during the comparison. It was found that with the correct simulation setup, Virtual SEA provides good agreement with the experimental results. In case of the spotwelded variants, further investigations were necessary regarding the parameters of the connection. The influence of these parameters was evaluated and the greatest source of deviations in the results is found.

Open Access: Yes

DOI: 10.21595/jve.2022.22754

Descriptive Markers for the Cognitive Profiling of Desktop 3D Spaces

Adam Csapo Anna Sudar

Publication Name: Electronics Switzerland

Publication Date: 2023-01-01

Volume: 12

Issue: 2

Page Range: Unknown

Description:

3D virtual reality spaces, whether running on desktop environments or on immersive displays, have been noted to support a radically new and highly stimulating way of working with digital content in a variety of application domains. At the same time, research in recent decades has produced a number of experimental results showing that the use of 3D, as opposed to 2D interfaces, can lead to performance improvements from a wide range of aspects, including the ability to comprehend and retain knowledge, ability to work collaboratively in more creative and effective ways, and ability to carry out workflows integrating numerous sources of information in less time. In this paper, we first review the relevant literature; then, we describe an exploratory study that we carried out with test subjects, both in a 3D desktop virtual environment and in a 2D web-based environment, while collecting eye tracking data. In the study, subjects were presented with a set of multimedia content on a range of topics within the field of astronomy, based on which they were subsequently asked to fill out a set of questionnaires. By comparing the 2D and 3D cases in terms of correctness of answers, time taken to perform the task, pupil dilation measurements, subjects’ self-reported difficulty assessments, as well as various kinds of high-level interaction patterns employed during the task (in 3D), we were able to identify a set of descriptive markers which may be relevant to the prediction of users’ effectiveness in virtual reality workspaces. In a weaker sense, the results also seem to support previous research works claiming improved effectiveness in 3D spaces compared to 2D web-based interfaces, although further work is needed to more clearly identify the constraints within which such benefits can be guaranteed.

Open Access: Yes

DOI: 10.3390/electronics12020448

Cultural Impact on Environmental Sustainability Practices: a Comparative Study using Hofstede's Cultural Dimensions

Heba F. Zaher

Publication Name: Chemical Engineering Transactions

Publication Date: 2023-01-01

Volume: 107

Issue: Unknown

Page Range: 157-162

Description:

As the importance of environmental sustainability grows on a global scale, it is crucial to understand the factors that impact a country’s adoption and implementation of sustainable practices. This study aims to investigate the relationship between cultural factors outlined by Hofstede’s framework and the adoption and implementation of environmental sustainability practices across countries. Using data about 87 countries from the World Bank database during the period 2015-2019 regarding environment indicators and the Hofstede Insights website regarding cultural dimensions of the countries, this study finds that out of the six cultural dimensions proposed by Hofstede, the power distance and indulgence dimensions have an effect on environmental sustainability practices of countries. Specifically, low power distance and high indulgence lead to more robust environmental sustainability practices. On the other hand, individualism, masculinity-femininity, uncertainty avoidance, and long-term orientation dimensions have no significant impact on the environmental sustainability practices of countries.

Open Access: Yes

DOI: 10.3303/CET23107027

Generation and Evaluation of CPT Data Using Kriging Interpolation Technique

Ayele Chala R. P. Ray

Publication Name: Periodica Polytechnica Civil Engineering

Publication Date: 2023-01-01

Volume: 67

Issue: 2

Page Range: 545-551

Description:

The cone penetration test (CPT) has been the de facto field exploration method in geotechnical engineering for decades. Variations of CPT can measure parameters for seismic, environmental, and hydrological applications. Analyzing response often requires properties in areas that have little or no data. Therefore, given the limited CPT data, it is critical to understand how to accurately estimate the soil properties at unsampled locations. In this paper, we generated soil shear wave velocity profiles using the kriging interpolation technique and assessed their performance using site response analysis. Four kriging interpolation-based shear wave velocity profiles and four additional CPT-based shear wave velocity profiles defined site conditions for response analysis. We performed a series of 1-D equivalent linear site response analyses using STRATA software. The site response analysis results are presented as amplification factors (AF), peak ground acceleration (PGA) profiles, surface spectral acceleration, and surface acceleration time histories. Compared to CPT-based profiles, the results of kriging interpolation-based profiles were evaluated and discussed. The results confirmed the reliability of the kriging interpolation technique in predicting soil parameters at unsampled locations.

Open Access: Yes

DOI: 10.3311/PPci.21865

Numerical Investigation of Glue Laminated Timber Beams considering Reliability-based Design

Majid Movahedi Rad Dániel Harrach Muayad Habashneh

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2023-01-01

Volume: 20

Issue: 1

Page Range: 109-122

Description:

Structural models and their related parameters, are most often considered as deterministic, in numerical analysis. However, according to test results, one can see the existence of uncertainties, in most cases, due to various reasons, such as, natural variabilities and ignorance. Thus, dealing with uncertainty has gained massive attention, due to its importance in structural analysis and anticipating the performance of models. In fact, in some cases of special structure components, like glue laminated timber beams, it appears to be, that there is an absence of information concerning uncertainties. Therefore, the main objective of this study is to inspect uncertainties that facing designers and their role in glue laminated timber beams behavior, by considering different material parameters as random variables. In addition, four-point bending tests are conducted and finite element analysis is conducted, using ABAQUS software, to model the nonlinear behavior of GLT beams. For purposes of numerical model calibration, Hill yield criterion constitutive model is considered based on the obtained data from the experimental test. The results of this study provide a better outline for understanding the effect of uncertainties on glue laminated timber beams.

Open Access: Yes

DOI: 10.12700/APH.20.1.2023.20.8