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Found 6414 publications

Modelling and Sensitivity Analysis of Nonlinear Firefighting Systems Using Maple

F. Hajdu Rajmund Kuti G. Y. Molnarka

Publication Name: Communications in Computer and Information Science

Publication Date: 2021-01-01

Volume: 1414

Issue: Unknown

Page Range: 234-251

Description:

Mathematical modelling and numerical simulations have greatly contributed to the development of technical sciences in the recent decades. With powerful tools, like Maple, the examination of ever newer engineering applications in simulation environment was made possible. This paper gives an overview of mathematical modelling and numerical examination of nonlinear fire truck suspension systems using Maple. The examined models are the suspension system of a heavy-duty fire truck with different degrees of freedom and a special double-cabin fire truck suspension system with a crew compartment. The construction of mathematical models, their implementation to Maple and the numerical simulation results are explained. Detailed One-at-a-Time sensitivity analysis results using a novel fuzzy logic based evaluation method developed in Maple are also presented. With the proposed method an extended parameter range can be examined and the parameters can be easily compared. From the sensitivity analysis it was concluded that the spring characteristics and the road models greatly affect simulation results.

Open Access: Yes

DOI: 10.1007/978-3-030-81698-8_16

Modified bacterial memetic algorithm used for fuzzy rule base extraction

János Botzheim László Gál Laszlo T. Koczy

Publication Name: 5th International Conference on Soft Computing as Transdisciplinary Science and Technology Cstst 08 Proceedings

Publication Date: 2008-12-01

Volume: Unknown

Issue: Unknown

Page Range: 425-431

Description:

In this paper we discuss an improved version of the Bacterial Memetic Algorithm (BMA) used for fuzzy rule base extraction. In previous works we have found several ways to improve the original BMA. Some of them perform well rather in the case of more complex fuzzy rule base, and some of them perform well rather in the case of less complex fuzzy rule base. We have combined the improvements into a new version of the BMA that performs well in each case investigated. Copyright 2008 ACM.

Open Access: Yes

DOI: 10.1145/1456223.1456310

Searching possible accident black spot locations with accident analysis and gis software based on GPS coordinates

Csaba Koren Attila Borsos Pál Hegyi

Publication Name: Pollack Periodica

Publication Date: 2017-12-01

Volume: 12

Issue: 3

Page Range: 129-140

Description:

There are several methods for the analysis of road accidents in a road network. In Hungary from 2011 GPS coordinates are used to identify the location of personal injury accidents. This method significantly improves the display of locations of accidents on the map, which can be then analyzed using GIS tools. Accident black spots are the most dangerous places in road networks identified by the density of the accidents in the network. One of the analysis methods is the accident density searching. The methods and algorithms used in some software may show differences in relation to one another. The aim of this research is comparing two applications by investigating the local road network in Györ. The analysis was made using the WEB-BAL accident analysis software using the density-based spatial clustering of applications with noise procedure and the QGIS software using the kernel density estimation method. The former is the official accident database and online software used for accident investigations and the latter is an open source geographic information system. The results are visualized in accident density plots and black spot maps.

Open Access: Yes

DOI: 10.1556/606.2017.12.3.12

Investigations among family businesses operating in the settlement of the Transdanubia region

Csilla Polster Konczosné Szombathelyi Márta

Publication Name: Civil Szemle

Publication Date: 2021-01-01

Volume: 18

Issue: 2

Page Range: 21-34

Description:

This paper presents the role of family businesses in strengthening social capital. Its aim is to examine the impact of these enterprises on local society and their role in local society. In this paper, after the interpretation of family businesses, social capital, embedding, and local society, the impact of the examined family businesses on local society is presented. The method of this study was in-depth interviews conducted among the owners of 207 family businesses in Transdanubia counties: 128 in villages and small towns, and 79 in medium-sized and large cities were conducted. In the framework of the interviews, therelations of family businesses at the local level, their relations with social organizations, their identity and attachments, and their embeddedness were explored. The main results of the in-depth interviews are that in three of the five indicators examined, in the smaller settlements the embedded family companies have a stronger embeddedness and con-nection with the local society, in one case it is equally high. However, family businesses in larger settlements also have a very significant impact on local society, in terms of trust, reputation, family values, community relations and collaborations, social networking, and local identity

Open Access: Yes

DOI: DOI not available

Tribological Investigation of Applicability of Nano-Sized Cupricoxide (CuO) Ceramic Material in Automotive Vehicles

Rajmund Kuti D. Tóth J. Rohde-Brandenburger I. Szabó

Publication Name: Fme Transactions

Publication Date: 2021-01-01

Volume: 49

Issue: 2

Page Range: 335-343

Description:

Due to the continuously increasing requirements of the internal combustion engines, the lubricants and their additives have to be further developed. One possible solution is the application of ceramic nanoparticles as friction modifier and wear decreaser additives. This paper presents the tribological investigation of cupricoxide (CuO) nanoparticle mixed in neat Group 3 base oil. To analyse its properties, simplified ball-on-disc friction experiments were carried out in the tribological laboratory in the Széchenyi István University in Győr, Hungary. The arisen wear scars were analysed with different, highresolution microscopes to understand the working mechanism of the nanoparticles. The results have indicated an optimum concentration of nanoparticles at 0.5wt% where both the average friction coefficient and the wear scar diameter were reduced by 15%. The microscopical investigation revealed the reduction of copper material from the CuO material, and it has mended to the rubbing surface forming a protective film on the metal surface.

Open Access: Yes

DOI: 10.5937/fme2102335T

Design of load torque and mechanical speed estimator of PMSM with unscented Kalman filter-An engineering guide

Karol Kyslan Frantisek Durovsky Viliam Fedak Viktor Slapak Krisztián Horváth

Publication Name: International Conference on Electical Drives and Power Electronics

Publication Date: 2017-11-27

Volume: 2017-October

Issue: Unknown

Page Range: 297-302

Description:

This paper presents the design of Unscented Kalman Filter (UKF) for estimation of state space variables of permanent magnet synchronous machine (PMSM). The UKF is shown together with the field oriented speed control. At first, the position and the speed of PMSM are measured, and UKF is used only for a load torque estimation. It is indicated how differences in sampling time of the speed and the current loop affects overall estimation performance. Subsequently, speed sensorless performance of the UKF with the same parameters is shown for comparison. Designed filter is verified only by Matlab simulation.

Open Access: Yes

DOI: 10.1109/EDPE.2017.8123249

Correspondences between Hungarian women's marital names and the traditional family schema

Judit Baranyiné Kóczy

Publication Name: Cognitive Linguistic Studies in Cultural Contexts

Publication Date: 2021-01-01

Volume: 14

Issue: Unknown

Page Range: 151-183

Description:

A marital name makes a statement about women's cultural values with respect to their family schemas. In Hungary, adopting the husband's full name by marriage is no longer required, thus women have the opportunity to choose from seven different name structures. The paper aims to uncover the motivations behind women's preference for marital name structures as influenced by the traditional family schema that they maintain in their background. Data for this analysis is extracted from a questionnaire distributed to 533 women, which seek to obtain information on key elements of the traditional family schema. Results do not reveal a direct correlation between the selection of marital names and any single component of the traditional family schema; however, overall the results of the survey outline a systematic correspondence between marital names and women's conformity or non-conformity to the traditional family schema. In conclusion, the various marital name structures reflect diverse family schemas, in particular, they are representatives of Hungarian women's different extent of adherence to the traditional family schema.

Open Access: Yes

DOI: 10.1075/clscc.14.08koc

‘Law Is Not Politics’: The Role of the Liberal View on Law in the Rise of “New Populism”

Mátyás Bencze

Publication Name: Law Populism and the Political in Central and Eastern Europe

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: 166-183

Description:

While it is widely accepted that the recent democratic decline in Hungary can be traced back to many factors (e.g., political, social, economic, etc.), it may be worthwhile to focus on and analyse one of them in particular: the fact that the dominance of the liberal discourse on the law between 1990 and 2010 led to jurists, democratic politicians, and other intellectuals becoming exposed to the attacks of neo-authoritarian forces. In this chapter, I examine one of the characteristics of the liberal theory of law which facilitated the spread of a conviction among democratically thinking people with an interest in public affairs. This conviction is based on the assumption that there is a sharp boundary between law and politics, and following from that, that neutral legal institutions, by relying solely on the law, are able to defend the rights of the citizens against any political attack. Believing in this myth, democrats did not appreciate the true weight of the political nature of legal decision making, and the undemocratic forces were able to capitalise on their naïvety.

Open Access: Yes

DOI: 10.4324/9781032624464-8

Towards 100% Overall Equipment Effectiveness (OEE) at Semi-automatic Assembly Lines – Case Study

Péter Dobra

Publication Name: Springer Proceedings in Mathematics and Statistics

Publication Date: 2021-01-01

Volume: 364

Issue: Unknown

Page Range: 281-289

Description:

In almost all cases, automotive companies and automotive suppliers monitor the efficiency of their production and measure it with different metrics. Based on predefined Key Performance Indicators (KPI’s), the production results of manufacturers show generally definite trends. Higher production efficiency induces higher financial results. Companies typically use Overall Equipment Effectiveness (OEE) to measure and evaluate their production as a gold standard and best practice. In production 100% score of OEE means only good parts (which are accepted by the customer), as fast as possible (based on production plan), without stoppage time. This article is looking for answer to the question how to reach maximum effectiveness and under what circumstances this can be overcome at a hybrid assembly line. Firstly, a literature review demonstrates its scientific relevance. Secondly, an example from the automotive industry illustrates how to perform close to 100% on a semi-automatic assembly line and in which cases it can be exceeded. OEE components, as availability, performance and quality are examined in detail to get excellent percentage. This paper highlights that if the operator performs at the gearbox semi-automatic line above the expected cycle time and with stable entire logistics process, the OEE value may be higher than 100%.

Open Access: Yes

DOI: 10.1007/978-3-030-92604-5_25