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Found 6278 publications

Analysis of a vector hysteresis measurement system

Miklós Kuczmann

Publication Name: Journal of Optoelectronics and Advanced Materials

Publication Date: 2008-01-01

Volume: 10

Issue: 7

Page Range: 1823-1827

Description:

The paper deals with the numerical analysis of a vector hysteresis measurement system which is now under construction. The measurement set up consists of an induction motor which rotor has been removed, and its windings have been replaced to a special two phase one which can generate homogeneous magnetic field inside the motor. A round shaped specimen can be inserted into the arrangement. The two orthogonal components of the magnetic field intensity and of the magnetic flux density vectors can be measured by H-coils and B-coils, respectively. The Finite Element Method (FEM) with the T, Φ - ΦD potential formulation has been applied in the simulations. The vector hysteresis property of the specimen has been approximated by the vector Preisach model, finally the nonlinear problem has been solved by the convergent fixed point technique. The aim of the present work is to focus on the design aspects of this kind of measurement system.

Open Access: Yes

DOI: DOI not available

Effects of foreign direct investment on the labour market in the Komárom-Komárno area

Ingrid Szabó András Kovács

Publication Name: Foldrajzi Ertesito

Publication Date: 2008-01-01

Volume: 57

Issue: 1-2

Page Range: 229-241

Description:

The industrial park located in the town of Komárom (Hungary) belongs to the most successful examples of the Hungarian economic transition process and structural change. Nowadays the Nokia cell phone factory and its suppliers secure workplace for about 15,000 workers (half of them commuting from the neighbouring Slovakia) laying down the long-term, stable prosperity of the region. This paper analyses the situation and changes in labour market of Komárom-Komárno borderland region, and introduces the micro- and macroeconomic factors, which are influencing its further development. The draining of reserves in free labour force of the region, and the diminishing number of Slovakian workers will fundamentally influence the structure of employment of the border region and will ultimately result in a steady over-demand in labour force. In the analysis it is argued that only a proactive, regional, integrated labour force development strategy and a conscious plan for attraction of new workers into the town(s) can result a sustainable economic development for Komárom and its region.

Open Access: Yes

DOI: DOI not available

Preliminary data of life and health insurance in the Roman Law (the collegium funeraticium and the collegium tenuiorum)

Ágnes Váradi

Publication Name: Orvosi Hetilap

Publication Date: 2007-12-30

Volume: 148

Issue: 52

Page Range: 2477-2481

Description:

With the explosion of insurance contracts in the last two hundred years both in Europe and around the rest of the world, there is a temptation to think that the financing and insuring on projects on limited or non-recourse terms is a relatively novel concept. This is, however, far from being true. Indeed, there is an early evidence of project financing techniques and insurance contracts being actively used during the ancient times. The first examples come from the Roman law but there are similar legal institutions even in the ancient Greek legal system. - The essay analyses the legal history of assurances on lives and health in the Roman law, especially the question of the collegium tenuiorum and the collegium funeraticium. In the centre of the studies are the analyses of their legal personality, the changes in the regulation concerning their foundation, the purpose and the internal organisation. The treatment of the main topics begins with fragments from the material of the Corpus Iuris Civilis by Justinian. After that the views of the most important authors and the contemporary investigations in the Roman law found the statements of the paper. - As a result of these analyses we can see the process of development in the ancient legal systems, especially in the Roman law. And although these results have no immediate influence on the present legal regulation, it can demonstrate original tendencies in the field of insurances. This way we can prove that the Roman law is a still existing basis for the development in contractual law.

Open Access: Yes

DOI: 10.1556/OH.2007.28274

Progress on joint experiments on small tokamaks

E. Dufkova J. Brotankova M. Berta R. Dejarnac A. Fonseca G. Ramos G. M. Vorobjev A. Talebitaher J. Sentkerestiova B. Tál I. El Chama Neto V. Soldatov E. Sukhov I. Ďuran A. W. Kraemer-Flecken J. G. Ferreira A. Singh H. Hegazy H. Hegazy A. M. Marques Fonseca P. Khorshid C. R. Gutierrez Tapia L. Ruchko G. Kirnev N. Kirneva E. Del Bosco V. Vershkov A. Malaquias M. Hron B. Kuteev G. Mank M. Gryaznevich L. I. Krupnik V. Budaev A. Ovsyannikov A. Melnikov G. Van Oost M. Sokolov Y. Kuznetsov P. Peleman J. Zajac S. Zoletnik V. Weinzettl J. Stöckel

Publication Name: 34th Eps Conference on Plasma Physics 2007 Eps 2007 Europhysics Conference Abstracts

Publication Date: 2007-12-01

Volume: 31

Issue: 1

Page Range: 435-438

Description:

No description provided

Open Access: Yes

DOI: DOI not available

S-shaped fuzzy flip-flops

Rita Lovassy László T. Kóczy

Publication Name: 8th International Symposium of Hungarian Researchers on Computational Intelligence and Informatics Cinti 2007

Publication Date: 2007-12-01

Volume: Unknown

Issue: Unknown

Page Range: 383-391

Description:

The multilayer perceptron is an artificial neural network that learns nonlinear function mappings. Nonlinear functions can be represented by multilayer perceptrons with units that use nonlinear activation functions. The neurons in the multilayer perceptron networks typically employ sigmoidal activation function. The next state of the J-K fuzzy flipflops (F3) using Fodor, Yager and Dombi operators present S-shaped characteristics. An interesting aspect of F3-s might be that they have a certain convergent behavior when one of their inputs (e.g. J) is exited repeatedly. If J is considered the equivalent of the traditional input of a neuron (with an adder unit applied before J), K might play a secondary modifier's role, or can just be set fix. The paper proposes the investigation of such possible F3-networks as new alternative types of neural networks.

Open Access: Yes

DOI: DOI not available

FORthSIGHT: An aid for visually impaired people

Z. Puklus Attila Kürtösi

Publication Name: 8th International Symposium of Hungarian Researchers on Computational Intelligence and Informatics Cinti 2007

Publication Date: 2007-12-01

Volume: Unknown

Issue: Unknown

Page Range: 647-655

Description:

simple and smart text-enlarger application for MS windows operational systems.

Open Access: Yes

DOI: DOI not available

A logic model for inference chains in expert systems

Jozsef Sziray

Publication Name: International Conference on Artificial Intelligence and Pattern Recognition 2007 Aipr 2007

Publication Date: 2007-12-01

Volume: Unknown

Issue: Unknown

Page Range: 243-248

Description:

This paper deals with the calculations performed in the reasoning process of rule-based expert systems, where inference chains are applied. It presents a logic model for representing the rules and the rule base of a given system. Also, the fact base of the same expert system is involved in the logic model. The proposed equivalent representation manifests itself in a logic network. After that, a four-valued logic algebra is introduced. This algebra is used for the calculations where forward chaining is carried out. Next, the notion of line-value justification is described. This operation is applied in the backward chaining process, also on the base of the previously introduced four-valued logic. The paper describes two exact algorithms which serve for the forward and backward chaining processes. These algorithms make it possible to be implemented by a computer program, resulting in an efficient inference engine of an expert system. The achieved result enhances the reliability and usability of the intelligent software systems which is extremely important in embedded environments.

Open Access: Yes

DOI: DOI not available

The possible applications of Fuzzy logic for the treatment of conflicts in the dispositional tasks of railway traffic control centers

Tibor Héray Gabor Rozsa László T. Kóczy

Publication Name: IEEE AFRICON Conference

Publication Date: 2007-12-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

the handling of traffic conflicts of trains is rather complicated if full dynamic models are used. Often it is senseless to take into consideration all details of the motion equations and environmental parameters especially as the main parameters, like maximum speed of the trains involved are not exactly known. Also, a large number of noise type variables are always available. The paper proposes the use of the Mamdani type fuzzy rule based reasoning algorithm for handling railway traffic conflicts. The essential point is the granulation of all important parameters into a relatively small number of categories labeled by terms such as small, large, etc. This way the possible decisions for a concrete traffic conflict situation get various fuzzy weights after accumulation of all the fired rules. The final (non-fuzzy) decision is taken by choosing the option with the largest weight. A simplified example is presented for a delay and overtaking type conflict. ©2007 IEEE.

Open Access: Yes

DOI: 10.1109/AFRCON.2007.4401624

Fuzzy flip-flops revisited

Rita Lovassy László T. Kóczy

Publication Name: Advances in Soft Computing

Publication Date: 2007-12-01

Volume: 42

Issue: Unknown

Page Range: 643-652

Description:

J-K flip-flops are elementary digital units providing sequential features/memory functions. Their definitive equation is used both in the minimal disjunctive and conjunctive forms. Fuzzy connectives do not satisfy all Boolean axioms, thus the fuzzy equivalents of these equations result in two non-equivalent definitions, "reset and set type" fuzzy flip-flops (F3) by Hirota & al. when introducing the concept of F3. There are many alternatives for "fuzzifying" digital flip-flops, using standard, algebraic or other connectives. The paper gives an overview of some of the most famous F3-s by presenting their definitions and presenting graphs of the inner state for a typical state value situation. Then a pair of non-associative operators is introduced, and the properties of the respective F3 are discussed. The investigation of possible fuzzy flip-flops is continued by examining Türksen's IVFS, its midpoint values, and by introducing "minimized IVFS" (MIVFS), along with the MIVFS midpoints. © 2007 Springer-Verlag Berlin Heidelberg.

Open Access: Yes

DOI: 10.1007/978-3-540-72434-6_65