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The Method of Fundamental Solutions Combined with a Multi-level Technique

Csaba Gáspár

Publication Name: Lecture Notes in Computer Science Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics

Publication Date: 2019-01-01

Volume: 11386 LNCS

Issue: Unknown

Page Range: 241-249

Description:

A traditional idea of the Method of Fundamental Solutions is to use some external source points where the fundamental solution should be shifted to. However, the proper definition of the locations of the sources can hardly be performed in an automated way. To circumvent this difficulty, in this paper, the source points defined along the boundary, and the collocation points are shifted to the interior of the domain together with a proper modification of the boundary conditions. Thus, the problem of singularity is avoided. The modified boundary conditions are defined on the basis of the tools of the classical finite difference methods. Several schemes are presented. The schemes can be embedded in a multi-level context in a natural way. The proposed method avoids the computational difficulties due to ill-conditioned matrices and also reduces the computational complexity of the Method of Fundamental Solutions.

Open Access: Yes

DOI: 10.1007/978-3-030-11539-5_26

Warping transfer superelement model for bolted end-plate connections subject to 3D loads

B. Vaszilievits-Sömjén Majid Movahedi Rad J. Szalai

Publication Name: Stability and Ductility of Steel Structures Proceedings of the International Colloquia on Stability and Ductility of Steel Structures 2019

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: 1210-1217

Description:

A simple beam element based modelling technique has been developed which makes possible to analyze frames made of I sections with column-rafter bolted end-plate connections, subject to 3D loads, compatible with the thin walled beam theory with 7DOF beam elements. The model previously developed by the same team for welded connections has been ex-tended with the addition of linear spring elements to model the bolts located at the upper and lower beam flange level. The spring stiffnesses are calculated based on the extension of the Eurocode component method and verified by simulations performed with FEA software Abaqus.

Open Access: Yes

DOI: DOI not available

Development of a reduced fat and lactose-free dairy spread containing viable lactic acid bacteria – part 1: Technology of manufacture

Gábor Kátay László Varga

Publication Name: Elelmiszervizsgalati Kozlemenyek

Publication Date: 2019-01-01

Volume: 65

Issue: 2

Page Range: 2470-2485

Description:

The popularity of buttercream, considered to be a reduced energy, cheaper version of butter with a better function of use, has been constant in Hungary for three and a half decades. Our objective was to develop a new type of functional buttercream manufacturing technology. In order to achieve this, the pressure value resulting in parameters ensuring the adequate texture and good adsorption of the finished product during the one-stage homogenization of 30% fat cream was determined, as well as to what extent the viscosity of cream and its ease of handling are affected by ho-mogenization. It has been found that the criteria for the homogenization effect can be achieved by single homogenization of a 30% fat cream containing a milk protein con-centrate serving as the raw material for the new type of butter product on a single-stage homogenization machine at 65 °C and 15 MPa (150 bar). Due to the increased viscosity of the cream treated this way, the use of a tubular or scraped-surface heat exchanger is recommended. Our reduced fat, lactose-free buttercream with live cul-ture can be manufactured safely with the technology developed, and with the enzyme and starter cultures used, the lactose content of the product will be less than 0.1%.

Open Access: Yes

DOI: DOI not available

Validation of the Overall Stability Design Methods (OSDM) for tapered members

G. Hajdú Ferenc Papp J. Szalai

Publication Name: Sdss 2019 International Colloquium on Stability and Ductility of Steel Structures

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

Two new stability design methods are demonstrated and validated: the Overall Strength Reduction Method (OSRM) and the Overall Imperfection Method (OIM). Both methods are based on the linear buckling analysis (LBA) of global structural models and use the standard reduction curves. The OSRM is formulated in the classic way using generalized slenderness and reduction factors while the OIM uses equivalent amplitude for the buckling mode based geometrical imperfection. These new design methods cover all types of buckling modes, which can be calculated by LBA of structural models composed of tapered members with arbitrary support conditions and subjected to any complex loading. This paper clarifies the mechanical interpretation and proper calculation of all the components of the two methods in case of tapered members with arbitrary support conditions. The validation is performed on GMNIA results for several different buckling situations of tapered members proving the accuracy of the OSDM.

Open Access: Yes

DOI: DOI not available

The mechanical and the geometrical state of railway vehicle carriages

No authors available

Publication Name: Proceedings - 25th Danubia-Adria Symposium on Advances in Experimental Mechanics, DAS 2008

Publication Date: 2019-01-01

Volume:

Issue:

Page Range: 181-182

Description:

Open Access: No

DOI: DOI not available

Assessment of genetic diversity and phylogenetic relationship of Limousin herds in Hungary using microsatellite markers

Csilla Józsa Beáta Bán László Rózsa Márton Szűcs Attila Zsolnai Ferenc Szabó István Anton

Publication Name: Asian Australasian Journal of Animal Sciences

Publication Date: 2019-01-01

Volume: 32

Issue: 2

Page Range: 176-182

Description:

Objective: This study was conducted to investigate basic information on genetic structure and characteristics of Limousin population in Hungary. Obtained results will be taken into consideration when adopting the new breeding strategy by the Association of Hungarian Limousin and Blonde d'Aquitaine Breeders (AHLBB). Methods: Genetic diversity and phylogenetic relationship of 3,443 Limousin cattle from 16 different herds were investigated by performing genotyping using 18 microsatellite markers. Amplified DNA was genotyped using an automated genetic analyzer. Results: Mean of effective alleles (ne) of the populations was 3.77. Population C had the lowest number of effective alleles (3.01) and the lowest inbreeding coefficient (FIS) value (-0.15). Principal component analysis of estimated genetic distance (FST) values (p<0.000) revealed two herds (C and E) distinct from the majority of other Limousin herds. The pairwise FST values of population C compared to the others (0.066 to 0.120) fell into the range of moderate genetic distance: 0.050 to 0.150, while population E displayed also moderate genetic distance (FST values in range 0.052 to 0.064) but only to six populations (G, H, J, L, N, and P). FST(C-E) was 0.148, all other pairs -excluding C and E herds- displayed low genetic distance (FST<0.049). Population D, F, I, J, K, L, N, O, and P carried private alleles, which alleles belonged to 1.1% of the individuals. Most probable number of clusters (K) were 2 and 7 determined by Structure and BAPS software. Conclusion: This study showed useful genetic diversity and phylogenetic relationship data that can be utilized for the development of a new breeding strategy by AHLBB. The results presented could also contribute to the proper selection of animals for further whole genome scan studies of Limousins.

Open Access: Yes

DOI: 10.5713/ajas.18.0164

Development processes of regional centres in Central and Southeast Europe - From state socialism to dependent market economies

No authors available

Publication Name: DETUROPE

Publication Date: 2019-01-01

Volume: 11

Issue: 2

Page Range: 92-100

Description:

The background of the current research is that despite the existence of a vast amount of literature devoted to the study of post-socialist transition processes, there is a relative scarcity of international comparative analyses on Central and Southeast European metropolises. The research seeks to explore FDI-driven transformation and development processes in Central and Southeast European regional centres in the posttransition period. The geographical focus of the analysis is limited to Central and Southeast European postsocialist states, while the scale of the analysis targets the metropolitan and regional level. The present study provides a brief summary of the first phase of the research constituted by literature review.

Open Access: No

DOI: DOI not available

Intuitionistic Fuzzy Model of Traffic Jam Regions and Rush Hours for the Time Dependent Traveling Salesman Problem

Peter Foldesi Boldizsar Tuu-Szabo Ruba Almahasneh L. T. Kóczy

Publication Name: Advances in Intelligent Systems and Computing

Publication Date: 2019-01-01

Volume: 1000

Issue: Unknown

Page Range: 123-134

Description:

The Traveling Salesman Problem (TSP) is one of the most extensively studied NP-hard graph search problems. Many researchers published numerous approaches for quality solutions, applying various techniques in order to find the optimum (least cost) or semi optimum solution. Moreover, there are many different extensions and modifications of the original problem, The Time Dependent Traveling Salesman Problem (TD TSP) is a prime example. TD TSP indeed was one of the most realistic extensions of the original TSP towards assessment of traffic conditions [1]. Where the edges between nodes are assigned different cost (weight), considering whether they are traveled during the rush hour periods or they cross the traffic jam regions. In such conditions edges are assigned higher costs [1]. In this paper we introduce an even more realistic approach, the IFTD TSP (Intuitionistic Fuzzy Time Dependent Traveling Salesman Problem); which is an extension of the classic TD TSP with the additional notion of intuitionistic fuzzy sets. Our core concept is to employ intuitionistic fuzzy sets of the cost between nodes to quantify traffic jam regions, and the rush hour periods. Since the intuitionistic fuzzy sets are generalizations of the original fuzzy sets [2], then our approach is a usefully extended, alternative model of the original abstract problem. By demonstrating the addition of intuitionistic fuzzy elements to quantify the intangible jam factors and rush hours, and creating an inference system that approximates the tour cost in a more realistic way [3]. Since our motivation is to give a useful and practical alternative (extension) of the basic TD TSP problem, the DBMEA (Discrete Bacterial Memetic Evolutionary Algorithm) was used in order to calculate the (quasi-)optimum or semi optimum solution. DBMEA has been proven to be effective and efficient in a wide segment of NP-hard problems, including the original TSP and the TD TSP as well [4]. The results from the runs based on the extensions of the family of benchmarks generated from the original TD TSP benchmark data set showed rather good and credible initial results.

Open Access: Yes

DOI: 10.1007/978-3-030-21920-8_12

Crime “hot-spots” identification and analysis in Hungary by computational intelligence

Peter Foldesi Boldizsar Tuu-Szabo Gabor Kovacs Gergő Fogarasi L. T. Kóczy Szilvia Nagy

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2019-01-01

Volume: 16

Issue: 10

Page Range: 137-155

Description:

In the constantly growing and widening field of forensic science, crime maps are used in versatile ways. The representation of the data and analysis could offer some steps toward crime prevention and helps understand patterns, in terms of a timely distribution of crime types. Clustering is able to help identify criminal hot-spots and additional analysis may determine which areas require intervention. The aim of this study is to present an analysis of criminal information related to Hungary, in annual and monthly breakdown.

Open Access: Yes

DOI: 10.12700/APH.16.10.2019.10.9