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Found 6327 publications

The Vision that Carries the Digital Transformation on Its Back—The Promises of 5G for Sustainability and for the Corporate Sector Focusing on the SMEs in Hungary

Árpád Tóth Áron Gyimesi Gyorgy Wersenyi

Publication Name: Springer Proceedings in Business and Economics

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: 119-144

Description:

Digital transformation, including emerging telecommunication technologies, can be a game changer in the case of SMEs. 5G technology paves the way to substitute different expansive communication technologies, becoming the backbone of i4.0 solutions. Although companies declare the importance of digital transformation, 5G is not necessarily part of it. Especially, SMEs are uncertain about 5G. This paper highlights the business model opportunities and benefits of utilizing this disruptive technology. We analyze the 5G awareness of Hungarian SMEs based on a survey targeting their digital transformation. Hungarian SMEs have significant unawareness regarding the technical issues and the business manners as well. Providing information and guidance based on governmental funding is expected and required.

Open Access: Yes

DOI: 10.1007/978-981-19-8485-3_5

Investigation of Turbocharger Compressor Wheel Damage Due to Collision with Condensed Water Droplets

Ibolya Zsoldos András Lajos Nagy Richárd Takács

Publication Name: Lecture Notes in Mechanical Engineering

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: 575-581

Description:

The compressor wheels used in turbochargers have typically been made of aluminium alloy for decades. The primary reason is to achieve the lowest possible rotor inertia. However, while in the past this component was only encountered with filtered air, nowadays, due to developments in compliance with tightening emission standards, various fluids also collide with the spinning blades, which can cause mechanical damage. One such fluid is condensed water in the low-pressure exhaust gas channel (LP-EGR) formulated at cold starts and low-load conditions. This kind of design has been developed to reduce the nitrogen oxide emission and is used in both Otto and Diesel engines. This paper presents a testing method - implemented on a component testbench - and its results for this phenomenon. First, the effect of the volume flow of the condensed water colliding with the spinning blades was analyzed, and then, in addition to a constant volume flow, the speed dependence of the degree of damage was also determined. Next to the visual inspections, the physical changes on the blades were also detected by vibration diagnostic tools, mainly by analyzing the amplitude of the order correlated to the number of blades, from which we can deduce the changed balance level of the rotor.

Open Access: Yes

DOI: 10.1007/978-3-031-15211-5_48

Effects of Cognitive Biases and Their Fuzzy Measure During Freight Transportation

Peter Foldesi Adrian Horváth Eszter Sós

Publication Name: Lecture Notes in Logistics

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: 29-43

Description:

Cognitive biases affect all aspects of our lives, including the decision-making process related to the routing of freight transport. In the process of using human-machine systems, people upload rational and objective algorithms in order to obtain the best possible results in the route planning process. Nevertheless, during the route choice process, human reasoning, based on experience and assumptions, overrides the choice of the machine, that is, cognitive biases appear in the decision-making processes. For this reason, we investigate how an objective system of interests becomes a cognitive bias during the process of making decisions related to the route choice of freight transport by motor vehicle. Furthermore, we present a methodology to estimate fuzzy measures of route-related deviations concerning time and distance, which may be indicative of the emergence of cognitive biases.

Open Access: Yes

DOI: 10.1007/978-3-031-28236-2_3

Frame Design Using Nonprismatic Members – Satisfying the Need for Speed

No authors available

Publication Name: Proceedings of the Annual Stability Conference Structural Stability Research Council, SSRC 2023

Publication Date: 2023-01-01

Volume:

Issue:

Page Range: Unknown

Description:

This paper discusses a combination of best practices and procedures from recent work in Europe and the US, providing rational and economical calculations addressing the complexities associated with frame design using nonprismatic members. Recommendations are provided in the context of US design practice. A primary objective is to achieve maximum simplicity, transparency, and design speed while facilitating rigor of the underlying calculations. The paper provides several focused examples illustrating the recommended design verification procedures.

Open Access: No

DOI: DOI not available

Overall Equipment Effectiveness (OEE) Complexity for Semi-Automatic Automotive Assembly Lines

János Jósvai Péter Dobra

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2023-01-01

Volume: 20

Issue: 2

Page Range: 63-82

Description:

In industrial practice, measuring and monitoring production performance is an essential task. The production plan performance is monitored by middle and top management of companies daily, weekly and monthly and make short and long-term operational and strategic decisions when necessary. One of the most common ways of measuring the performance of production and, within this, of assembly lines, is to use the Overall Equipment Effectiveness (OEE) indicator. Although companies sometimes interpret and use this Key Performance Indicator (KPI) in their own way, it is the indicator that best reflects the development of the production efficiency for a given company. A high OEE percentage means high performance, which directly increases the company's profitability. This article explores the complexity of the OEE indicator, supported by the use of a cause and effect diagram. Firstly, a literature review demonstrates scientific relevance. Secondly, the factors affecting OEE are grouped and analyzed according to the following six aspects: man, environment, method, material, machine, and measurement. Each factor is further subdivided into five groups, and then these subgroups also cover five key factors of importance for the approachability of 100% OEE. The 150 aspects listed herein, provide a complete guideline for a semi-automatic assembly line, to consistently increase efficiency in industrial practice.

Open Access: Yes

DOI: 10.12700/APH.20.2.2023.2.4

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

Learning Factories towards Industry 5.0: Evolutionary or Revolutionary?

No authors available

Publication Name: 19th IMEKO TC10 Conference "MACRO meets NANO in Measurement for Diagnostics, Optimization and Control"

Publication Date: 2023-01-01

Volume:

Issue:

Page Range: Unknown

Description:

Rather than representing a technological leap forward, Industry 5.0 actually nests the Industry 4.0 approach in a broader context, providing regenerative purpose and directionality to the technological transformation of industrial production for people-planet-prosperity [1]. Consequently, Industry 5.0 can be considered as the new engine of the economic and societal transition with a societal concept which can mean more distributed well-being with human-centric and sustainable, resilient industry. The advantage of the learning factory concept therefore lies in the combination of the realistic factory environment, processes and transparency of the structured activities which can provide testing of new features, modules, functionalities, tools, and technologies based on the existing Industry 4.0 framework. Especially, the concepts of implementing new business models with benchmarking emphasise the major difference in achievable results. Transition to a circular economy can only be achieved if up-skilling and re-skilling of workers can also be done which is the core function of the learning factory.

Open Access: No

DOI: DOI not available

Predicting the Impact of Product Type Changes on Overall Equipment Effectiveness through Machine Learning

János Jósvai Péter Dobra

Publication Name: Periodica Polytechnica Mechanical Engineering

Publication Date: 2023-01-01

Volume: 67

Issue: 1

Page Range: 81-86

Description:

Nowadays, Industry 4.0 and the Smart Manufacturing environment are increasingly taking advantage of Artificial Intelligence. There are more and more sensors, cameras, vision systems and barcodes in the production area, as a result of which the volume of data recorded during manufacturing and assembly operations is growing extremely fast. The interpretation and processing of such production-type data by humans is no longer possible effectively. In the Big Data domain, machine learning is playing an increasingly important role within data mining. This paper focuses on the product change processes of semi-automatic assembly line batch production and examines the impact of product type changes on the Overall Equipment Effectiveness (OEE) and attempts to determine future values through supervised machine learning. Using decision tree technology, the effect on the OEE value can be predicted with an accuracy of up to 1%. The presented data and conclusions come from a real industrial environment, so the obtained results are proven in practice.

Open Access: Yes

DOI: 10.3311/PPme.21320

The Railway as a Sustainable Heritage: Monument Railways in the Service of Sustainability through the Example of the Győr‒Veszprém Railway Line

András Veöreös Csaba Sándor Horváth

Publication Name: Chemical Engineering Transactions

Publication Date: 2023-01-01

Volume: 107

Issue: Unknown

Page Range: 37-42

Description:

Nowadays, sustainability is a term that has been analysed many times in public life, among the technical and social sciences alike, examined from several sides, but at least often voiced. In the study, in relation to the sustainability of a healthy human life, it is examined how railways and their historic preservation contribute to this. As the basis of the research, it was chosen the only standard-gauge railway line in Hungary that is under monument protection railway line No. 11 between Győr and Veszprém. The research is based on the methodology of historical-architectural research: starting from the history of the railway, it explores its architectural and historical values, discusses the creation and importance of protection, and then tries to draw conclusions about the role of the railway line in sustainability by analysing social phenomena, and finally makes proposals for the role of sustainability regarding its increase. The novelty of the study is that it connects the ways of thinking of specialised fields that previously existed side by side. The purpose of monument protection is the preservation of values, which, according to the 20-th-century way of thinking, primarily serves cultural purposes. The monument protection of some parts of the analysed railway line clearly contributed to the preservation of the infrastructure. As an environmentally friendly and sustainable means of transport, the railway plays a prominent role in the healthy preservation of natural areas. This is proven by the history of the examined railway line.

Open Access: Yes

DOI: 10.3303/CET23107007