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Found 5164 publications

The polarization method combined with the Newton-Raphson technique in magnetostatic field problems

Miklós Kuczmann

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2008-12-01

Volume: 84

Issue: 12

Page Range: 198-201

Description:

Nonlinear magnetic field problems can be solved by using the polarization method. After applying the Finite Element Method (FEM), a system of nonlinear equations can be derived, which can only be solved by iterative techniques. The fixed point iteration scheme and the Newton-Raphson technique are the most widely used algorithms to solve nonlinear equations. The first is known as a convergent, but slow algorithm, while the other is a fast solver, which convergence can be critical. This paper presents and compares the two methods.

Open Access: Yes

DOI: DOI not available

The roles and possibilities of cultural and social relationship in the development of tourism in Subcarpathia

Orsolya Zsellér Ferenc Katona

Publication Name: Sisy 2008 6th International Symposium on Intelligent Systems and Informatics

Publication Date: 2008-12-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

The Central-East European region have undergone a radical change in the last 15 years. All of the political changes in regime also aimed at stabilizing the economies of the countries. Methods and short- and long-term results were different but each countries of the region strongly focuses on developing the sector of tourism, as they all realize the development opportunities of the service industry. In Hungary and its neighbors it is a recognizable trend in tourism that popular places of destination got chosen based on cultural and social connections and past relationships. This trend is truly recognizable in the view of Transilvanian and Slovakian tourism, but Subcarpathia is not so popular in spite of its thermal spas and cultural heritage. ©2008 IEEE.

Open Access: Yes

DOI: 10.1109/SISY.2008.4664950

Implementation of a basic flow model in traffic controlling

No authors available

Publication Name: 9th International Symposium of Hungarian Researchers on Computational Intelligence and Informatics, CINTI 2008

Publication Date: 2008-12-01

Volume:

Issue:

Page Range: 523-530

Description:

The contribution introduces a basic model, a manner, how to control - using the specific tools - A crossing of a highway and a lower volume road, while we stop the highway's traffic only in a critical case otherwise just slow it down.

Open Access: No

DOI: DOI not available

Nodal and edge finite element analysis of eddy current field problems

Miklós Kuczmann

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2008-12-01

Volume: 84

Issue: 12

Page Range: 194-197

Description:

Eddy current field problems can be solved by different potential formulations based on the "quasi-static" Maxwell's equations. The potential formulations are obtained using a vector potential and a scalar potential, the most widely used techniques are the A, V-A, the T,φ-φformulations and their combinations. Vector potentials can be approximated by nodal or edge finite elements, scalar potentials are approximated by scalar elements. The paper presents and compares these formulations through TEAM Problem No. 7 containing a multiply connected region.

Open Access: Yes

DOI: DOI not available

An application of the greedy heuristic of set cover to traffic checks

Pál Pusztai

Publication Name: Central European Journal of Operations Research

Publication Date: 2008-12-01

Volume: 16

Issue: 4

Page Range: 407-414

Description:

Let us suppose that X is a given, finite, not empty set and F is a given collection of subsets of X such that their union equals X, in other words F covers X. Set cover is the problem of selecting as few as possible subsets from F such that their union covers X. Max k-cover is the problem of selecting k subsets from F such that their union has maximum cardinality. Both problems are NP-hard. There is a polynomial time greedy heuristic that iteratively selects the subset from F that covers the largest number of yet uncovered elements. We implemented this greedy algorithm to support the planning of a checking system that is aimed to check the vehicles in a road network. We would like to answer such questions: - How many and which links are sufficient to check a given percentage of all traffic flow? - What percentage of traffic can be checked with given links? This paper defines the necessary data and basic knowledge, gives algorithms to answer the previous questions and also shows the results of an implementation in a road network that contains about 11,000 junctions, 3,000 origin-destination junctions and 26,000 links. © 2008 Springer-Verlag.

Open Access: Yes

DOI: 10.1007/s10100-008-0067-x

Examination and development of a radio frequency inductor

Miklós Kuczmann Zoltán Pólik

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2008-12-01

Volume: 84

Issue: 12

Page Range: 230-233

Description:

Nowadays, inductors can be found in almost every electrical and electronic product. These key components are needed to store electrical energy, select frequencies, and protect againist overvoltage and overcurrent. In the case of the inductors, which usually work in the range of radio frequency, the one of the most important attributes is the quality factor. The aim of the project is to increase the Q-factor of an RF SMT inductor and to favour the industrial research and development about inductors by using the finite element method.

Open Access: Yes

DOI: DOI not available

Resource allocation and cost reduction by means of alternative solutions

Zsolt Tibor Kosztyán Andrea Bencsik Z. Perjés

Publication Name: Innovations and Advanced Techniques in Systems Computing Sciences and Software Engineering

Publication Date: 2008-12-01

Volume: Unknown

Issue: Unknown

Page Range: 556-559

Description:

In the course of planning and implementation of projects it occurs frequently that after the preliminary calculation of the optimal resources allocation - in order to obtain minimal total cost - a project can not be realized at a price which is expected by the inviter of the tender. In the following study we present a method by which, in case of a delimited maximal budget, we are able to determine the schedule, cost demands and resource requirements of a project to be implemented with the highest possible quality. © Springer Science+Business Media B.V. 2008.

Open Access: Yes

DOI: 10.1007/978-1-4020-8735-6_103

Energy distribution modeling of car body deformation using LPV representations and fuzzy reasoning

István Harmati András Rövid P. Várlaki László Szeidl

Publication Name: Wseas Transactions on Systems

Publication Date: 2008-12-01

Volume: 7

Issue: 11

Page Range: 1228-1237

Description:

The main aim of the paper is to introduce a novel method - based on fuzzy control and linear parameter varying (LPV) system representation transformable into HOSVD based Canonical form - for modeling deformation processes with respect to the distribution of the absorbed kinetic energy. Modeling such kind of processes requires many uncertain input parameters. Using the proposed concept we are able to handle them and keep the complexity of the models low by using higher order singular value decomposition (HOSVD) technique.

Open Access: Yes

DOI: DOI not available

Comparison of fuzzy rule-based learning and inference systems

No authors available

Publication Name: 9th International Symposium of Hungarian Researchers on Computational Intelligence and Informatics, CINTI 2008

Publication Date: 2008-12-01

Volume:

Issue:

Page Range: 61-75

Description:

In our work we have compared various fuzzy rule based learning and inference systems. The base of the investigations was a modular system that we have implemented in C language. It contains several alternative versions of the two key elements of rule based learning - namely, the optimization algorithm and the inference method - which can be found in the literature. We obtained very different properties when combining these alternatives (changing the modules and connecting them) in all possible ways. The investigations determined the values of the quality measures (complexity and accuracy) of the obtained alternatives both analitically and experimentally where it was possible. Based on these quality measures the combinations have been ordered according to different aspects.

Open Access: No

DOI: DOI not available