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Found 6273 publications

Topic identification by the combination of fuzzy thesaurus and complexity pursuit

László T. Kóczy Sándor Szaszkó

Publication Name: Advances in Information Systems Development New Methods and Practice for the Networked Society

Publication Date: 2007-01-01

Volume: 1

Issue: PART 1

Page Range: 329-340

Description:

No description provided

Open Access: Yes

DOI: 10.1007/978-0-387-70761-7_28

Investigation of the spatial distribution algorithm of the traffic flow analysis and of the entity flow-phase analysis

László Muka Gábor Lencse

Publication Name: Esm 2007 2007 European Simulation and Modelling Conference Modelling and Simulation 2007

Publication Date: 2007-01-01

Volume: Unknown

Issue: Unknown

Page Range: 291-295

Description:

This paper investigates an important algorithm that is used in both the Traffic-Flow Analysis and the Entity Flow-phase Analysis. These methods are similar to each other and can be used for the fast and approximate (performance) analysis of Information and Communication Technology (ICT) systems and Business Process (BP) systems. Both methods contain an algorithm for the spatial distribution of the traffic (or entities) in the system. It is shown how the error of the spatial distribution can be measured, and the effect of the so called size of routing unit parameter of two algorithms is investigated.

Open Access: Yes

DOI: DOI not available

Prediction of fullerene stability using topological descriptors

Eniko Bitay Tamás Réti

Publication Name: Materials Science Forum

Publication Date: 2007-01-01

Volume: 537-538

Issue: Unknown

Page Range: 439-448

Description:

In recent years, several attempts have been made to characterize the geometric structure of fullerenes by means of topological shape factors in order to predict their physical properties and stability. In this paper, we present a simple method to estimate the stability of fullerenes on the basis of quantitative topological criteria. This approach is based on the concept of the generalized combinatorial curvatures defined on the set of simple graphs embedded on a closed surface without boundary (sphere, torus, projective plane, Klein bottle). It is shown that starting with the computed generalized combinatorial curvatures several novel topological indices can be generated. From computations performed on a set of C40 and C60 fullerenes, we concluded that the four topological shape factors tested (Λ(-1), Ω(-1), Λ(1) and Ω(1)) could be successfully used to preselect the most stable fullerene isomers.

Open Access: Yes

DOI: 10.4028/0-87849-426-x.439

On the temperature rate dependent transformation processes

Lino Costa Imre Czinege Imre Felde Tamás Réti Rafael Colas

Publication Name: Materials Science Forum

Publication Date: 2007-01-01

Volume: 537-538

Issue: Unknown

Page Range: 571-578

Description:

Kinetic models of new types are suggested which are designated primarily to predict the progress of non-isothermal transformations occurring during rapid heating and cooling in alloys. A common feature of each model outlined is that it takes into account not only the varying temperature but also the rate of temperature change on the transformation rate of the process. The two models represented by differential equations are generated by using the concept of virtual kinetic parameters, which can be determined from non-isothermal experiments only. A key property of the virtual parameter "p" involved in the transformation rate equations is that it quantitatively characterizes the temperature rate dependence of the non-isothermal reaction.

Open Access: Yes

DOI: 10.4028/0-87849-426-x.571

Computing behind the iron curtain and beyond Hungarian national perspective

Maria Raffai

Publication Name: IFIP International Federation for Information Processing

Publication Date: 2006-12-04

Volume: 215

Issue: Unknown

Page Range: 153-165

Description:

At the beginning of the computing era it was a great challenge to write a running program in order to solve different mathematical, statistical tasks, and to get the appropriate results by using a computer. At the university where I had began my studies we started to get acquainted with computers using a Russian made machine, named URAL 2. Looking back to the roots and thinking of the Hungarian born pioneer of computer science: the polymath John von Neumann, I had intended to deal with the history of computing at the very beginning of the eighties. Although there is a wide range of computing history literature worldwide (most of them in English), there are not any publications dealing with the Hungarian results. As I was one of the first graduates on computing taught by the Pioneers, I am forced to perform research on all materials dealing with the Hungarian achievements in computing, to protect the values of the past as long as it is not too late and also to make the results known!. © 2006 International Federation for Information Processing.

Open Access: Yes

DOI: 10.1007/978-0-387-34741-7_11

Application of tensor product models for vehicle de-formational processes

No authors available

Publication Name: Proceedings of the Mini Conference on Vehicle System Dynamics, Identification and Anomalies

Publication Date: 2006-12-01

Volume:

Issue:

Page Range: 615-620

Description:

Modelling of vehicle deformational processes plays an important role in car body design and accident analysis. It is a difficult task and usually carried out applying a kind of finite element method. Determination of the absorbed energy by the deformation and the corresponding energy equivalent speed (EES) can be of great importance. Exact determination or measuring of these quantities is almost impossible, so one could estimate them. In this paper we introduce a modeling technique and a model for describing the deformation process. A short description of the main idea: let we have a 3-dimensional rectangular grid on the vehicle body (or on something else). The partition is determined by taking into consideration the energy absorbing properties of the parts of the vehicle, so each cell is approximately homogenous. The cells could be identified as the entries of a tensor of order 3. We concentrate on the energy absorbed by the cells, but not on the physical coordinates of the cells. Energy absorption property (rate of the input and the absorbed energy) of a certain cell could change during the deformational process, so the absorbed energy is calculated using a monotonous decreasing function. These functions can be defined for each possible orthogonal direction of the possible impact. Instead of the original impact we deal with its orthogonal components and the result will be the sum of the particular results. The rectangular grid allows us to compute from level to level. These computations can be realized applying tensor products, the model has low complexity which can be more decreased by complexity reducing methods known from linear algebra.

Open Access: No

DOI: DOI not available

RFId application in production process of an automotive industry supplier

No authors available

Publication Name: INES 2006: 10th International Conference on Intelligent Engineering Systems 2006

Publication Date: 2006-12-01

Volume:

Issue:

Page Range: 45-48

Description:

The Department of Logistics and Forwarding at Széchenyi István University in Györ, Hungary started a project in an automotive industry supplier company. The purpose of the project is to grow the efficiency of the production process. In order to achieve the target we should reorganized the IT system. During the research we had to take the special production circumstances and the already exist ad hock information system into consideration. The article adumbrates the course of the project shortly, the faults of the system, the own-developed new information system and represents how the human failures could be eliminated though RFId application. © 2006 IEEE.

Open Access: No

DOI: DOI not available

The configurable digital cellular neural - Hopfield network

Tamás Zeffer Timót Hidvégi

Publication Name: Ines 2006 10th International Conference on Intelligent Engineering Systems 2006

Publication Date: 2006-12-01

Volume: Unknown

Issue: Unknown

Page Range: 160-164

Description:

A configurable Artificial Neuron Network that is capable of establishing both the emulated digital Cellular Neural Network (CNN) and the Hopfield Network is described. The configurable neural network is designed with the method of modularity where each module is a three weighted input neuron. The network can be optionally large limited only by the gate number available on a chip. Also, the network is reconfigurable during operation. © 2006 IEEE.

Open Access: Yes

DOI: DOI not available

Human factor in traffic models

Zsuzsanna Toth-Szabo Richard Horvath K. Kovacs

Publication Name: 2006 IEEE International Conference on Computational Cybernetics Iccc

Publication Date: 2006-12-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

This paper deals with modeling of human behavior in traffic systems. The first part of the paper gives a short survey of the corresponding literature introducing the most important problems of the area. The second part of the paper contains our approach aiming the development of a driver model applicable in the widely used simulation systems to describe practical traffic situations and analyze the safety aspects.

Open Access: Yes

DOI: 10.1109/ICCCYB.2006.305738