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Found 6278 publications

A novel behavior model based estimation method for the traffic capacity of signalized intersections

Jozsef Homlok K. Kovacs

Publication Name: 17th ITS World Congress

Publication Date: 2010-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

Traffic systems are man-made systems in which the human component as a complex factor plays a significant part. (1) The realistic modeling of them is extremely complicated. The aim of the paper is to present a traffic behavior model of inhomogeneous driver-populations and a corresponding estimation method. The traffic behavior model is developed for describing traffic flow in a signalized intersection. It works with inhomogeneous driver populations; different type of drivers may make different decisions in the same traffic situation. This way various driver types can be defined like aggressive, normal or conservative etc. drivers. The model focuses on the movement and the behavior of the inhomogeneous driver-populations approaching a signalized intersection, passing the amber signal light. The developed estimation method is intended to define the distribution of different driver types. This theory can allow an extensive and more complex traffic analysis on a more sensitive scale. The paper details the steps of the estimation process and the validation and introduces the results of the application of the estimation method with real experiments.

Open Access: Yes

DOI: DOI not available

Performance prediction of conservative parallel discrete event simulation

No authors available

Publication Name: 8th International Industrial Simulation Conference 2010, ISC 2010

Publication Date: 2010-01-01

Volume:

Issue:

Page Range: 214-219

Description:

In a previous paper, a quantitative criterion has been proposed for efficient execution of the Null Message Protocol, the best-known conservative parallel discrete event simulation (PDES) protocol. The criterion is based on a novel concept of the coupling factor, and allows one to use intuitive and easy-to-measure input parameters. The criterion can be used to assess simulation models' potential for parallel execution as well as the maximum partitioning that may still potentially yield good performance. This paper deals with experimental verification of the proposed rule that a large coupling factor is a necessary precondition for getting a good speed-up with conservative parallel simulation. A closed queueing network is used as simulation model, and it is run on up to 24 CPU cores. It is shown that the criterion provides a quick and convenient way to determine whether a simulation model has a potential for speed-up before actually investing work in the parallelization.

Open Access: No

DOI: DOI not available

Parameter optimisation in fuzzy flip-flop-based neural networks

László Gál Rita Lovassy L. ászlóT Kóczy László T. Kóczy

Publication Name: International Journal of Reasoning Based Intelligent Systems

Publication Date: 2010-01-01

Volume: 2

Issue: 3-4

Page Range: 237-243

Description:

This paper presents a method for optimising the parameters of fuzzy flip-flop-based neural networks (FNN) consisting of fuzzy J-K and D flip-flop neurons based on various popular fuzzy operations using bacterial memetic algorithm with the modified operator execution order (BMAM). In early works, the authors proposed the Levenberg-Marquardt algorithm (LM) a widely used second order gradient type training algorithm for fuzzy neural networks variables optimisation. The BMAM local and global search evolutionary approach is a bacterial type memetic algorithm which executes several LM cycles during the bacterial mutation after each mutational step, using the LM method more efficiently. Numerical experiments were performed to show the function approximation capability of various quasi optimised FNN types based on fuzzy J-K and D flip-flop neurons using algebraic, Lukasiewicz, Yager, Dombi, Hamacher and Frank norms, trained with LM method and BMAM algorithm. © 2010 Inderscience Enterprises Ltd.

Open Access: Yes

DOI: 10.1504/IJRIS.2010.036869

From childhood imitation based studying to a knowledge based society

Bencsik Andrea

Publication Name: International Journal of Learning

Publication Date: 2010-01-01

Volume: 17

Issue: 1

Page Range: 221-242

Description:

In most countries the following questions are very frequently asked: how can our country become a knowledge - based economy, what requirements are needed to meet to establish a knowledge based society, how can we form our culture that it should support the new behaviour? There are basic elements of national, organisational and personal culture, such as study skills and the willingness to study, methods of knowledge acquisition (for example literacy), childhood curiosity (for example which can be satisfied by the sample behaviour of adults), youthful pursuit of knowledge experience gained in the course of work. One of the critical elements of knowledge acquisition is how and from whom we can receive it. The other critical question is how we can share our knowledge with other people, how it should become a common value to improve the memory of organisations and nations. The features of this behaviour can be observed from childhood but these are going to change depending on the characteristics of the environment and age. In our research the emphasis was put on the age characteristics that influence our studying habits and sources of our knowledge acquisition from childhood to adulthood. The aim of this international research is to explore factors that can help and/or obstruct the process of knowledge sharing which should become daily routine from imitation - based studying to knowledge-based society. © Common Ground, Andrea Bencsik.

Open Access: Yes

DOI: 10.18848/1447-9494/cgp/v17i01/46801

Diffusion in electrodes used for resistance spot welding of galvannealed steel

Martha P. Guerrero-Mata Patricia Zambrano Imre Felde Mihaly Réger Maribel De La Garza Tamás Réti Rafael Colas

Publication Name: Defect and Diffusion Forum

Publication Date: 2010-01-01

Volume: 297-301

Issue: Unknown

Page Range: 300-307

Description:

A study was carried out on Zr-Cr bearing copper electrodes used for resistance spot welding of galvannealed steel strips. One electrode exhibited a series of well-defined layers in which Zn diffused to form β- and γ-brasses; an external layer containing iron was detected in this electrode. Another electrode that exhibited a high degree of damage did not exhibited continuous Zn-diffusion layers in all places, moreover, the Fe-containing layer was either removed, or had it grown to a high extent in some places; the occurrence of Cu-rich particles embedded within the Fe containing layer was observed. Multiple cracks were observed within the γ brass layer in both electrodes. The difference in the observed behaviour of the electrodes can be attributed to a difference in the characteristics of the galvannealed coating of the strips, as the first electrode was used to weld strips in which the layer corresponding to the γ phase was well developed, whereas the second electrode was used to weld strips with only an incipient layer. It can be concluded that growth of the γ phase changes the thermophysical properties of the zinc coating, affecting the temperature profile during spot welding. © (2010) Trans Tech Publications.

Open Access: Yes

DOI: 10.4028/www.scientific.net/DDF.297-301.300

Machine translation: Can it be a way of communication in a workgroup?

Agnes Varga

Publication Name: Idimt 2010 Information Technology Human Values Innovation and Economy 18th Interdisciplinary Information Management Talks

Publication Date: 2010-01-01

Volume: Unknown

Issue: Unknown

Page Range: 387-395

Description:

This paper focuses on the quality of machine translation and post-editing. Machine translation and post-editing proved to be useful in an enterprise environment as a fast and inexpensive way of translation. A software tool has been made to detect the edit distance between an orginal, raw machine translated text and its post-edited version. After detecting the edit operations (insertion, deletion, substitution and move) the editions have been (and will be further) analyzed to attempt to scale these editions according to frequency and gravity, so that later these results can be used for a tool for semi- or completely automatic post-editing.

Open Access: Yes

DOI: DOI not available

Multi-robot cooperation by fuzzy signature sets

No authors available

Publication Name: IMCIC 2010 - International Multi-Conference on Complexity, Informatics and Cybernetics, Proceedings

Publication Date: 2010-01-01

Volume: 2

Issue:

Page Range: 154-159

Description:

This paper presents a novel method for control cooperating robots without any explicit communication line. Fuzzy signatures are used as complex state description method for intention guessing and action selection. Finally a possible cooperative robot application on a realistic example with missing data components will be shown.

Open Access: No

DOI: DOI not available

Machine translation: Can it be a way of communication in a workgroup?

No authors available

Publication Name: IDIMT 2010: Information Technology - Human Values, Innovation and Economy - 18th Interdisciplinary Information Management Talks

Publication Date: 2010-01-01

Volume:

Issue:

Page Range: 387-395

Description:

This paper focuses on the quality of machine translation and post-editing. Machine translation and post-editing proved to be useful in an enterprise environment as a fast and inexpensive way of translation. A software tool has been made to detect the edit distance between an orginal, raw machine translated text and its post-edited version. After detecting the edit operations (insertion, deletion, substitution and move) the editions have been (and will be further) analyzed to attempt to scale these editions according to frequency and gravity, so that later these results can be used for a tool for semi- or completely automatic post-editing.

Open Access: No

DOI: DOI not available

Merging of shielded Gaussian vortices and formation of a tripole at low Reynolds numbers

Gábor Tóth Gábor Házi

Publication Name: Physics of Fluids

Publication Date: 2010-01-01

Volume: 22

Issue: 5

Page Range: 1-7

Description:

The interaction between two corotating shielded Gaussian vortices is studied by two-dimensional numerical simulations at low Reynolds numbers. It is shown that the outcome of the interactions can be a shielded monopole, a tripole, or dipolar breaking depending on the initial separation distance and Reynolds number. A flow regime map is given in the parameter space of initial separation distance and Reynolds number. Using formal decomposition for vorticity, we show that the tripole formation is due the same physical mechanism than merging of unshielded vortices, while in dipolar breaking both the symmetric and antisymmetric vorticity contributions play important role. © 2010 American Institute of Physics.

Open Access: Yes

DOI: 10.1063/1.3428539