Search in Publications

Found 6278 publications

Using the Newton-Raphson method in the polarization technique to solve nonlinear static magnetic field problems

Miklós Kuczmann

Publication Name: IEEE Transactions on Magnetics

Publication Date: 2010-03-01

Volume: 46

Issue: 3 PART 2

Page Range: 875-879

Description:

The paper presents and compares three potential formulations to solve nonlinear static magnetic field problems by applying the fixed point technique and the Newton-Raphson scheme. Nonlinear characteristics are handled by the polarization method in both algorithms. The proposed combination of the Newton-Raphson scheme and the polarization formulation results in a very effective nonlinear solver, because only the derivate of the characteristics, i.e., only the permeability or the reluctivity has to be used. Therefore, this method can be used to solve nonlinear problems with hysteresis, and it is faster than the classical fixed point method. © 2010 IEEE.

Open Access: Yes

DOI: 10.1109/TMAG.2009.2034260

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

EDICAM fast video diagnostic installation on the COMPASS tokamak

M. Berta Sz Tulipán A. Szappanos M. Hron G. Veres R. Pánek S. Zoletnik V. Weinzettl J. Stöckel

Publication Name: Fusion Engineering and Design

Publication Date: 2010-01-01

Volume: 85

Issue: 3-4

Page Range: 370-373

Description:

A new camera system event detection intelligent camera (EDICAM) is being developed by the Hungarian Association and has been installed on the COMPASS tokamak in the Institute of Plasma Physics AS CR in Prague, during February 2009. The standalone system contains a data acquisition PC and a prototype sensor module of EDICAM. Appropriate optical system have been designed and adjusted for the local requirements, and a mechanical holder keeps the camera out of the magnetic field. The fast camera contains a monochrome CMOS sensor with advanced control features and spectral sensitivity in the visible range. A special web based control interface has been implemented using Java spring framework to provide the control features in a graphical user environment. Java native interface (JNI) is used to reach the driver functions and to collect the data stored by direct memory access (DMA). Using a built in real-time streaming server one can see the live video from the camera through any web browser in the intranet. The live video is distributed in a Motion Jpeg format using real-time streaming protocol (RTSP) and a Java applet have been written to show the movie on the client side. The control system contains basic image processing features and the 3D wireframe of the tokamak can be projected to the selected frames. A MatLab interface is also presented with advanced post processing and analysis features to make the raw data available for high level computing programs. In this contribution all the concepts of EDICAM control center and the functions of the distinct software modules are described. © 2009 Elsevier B.V. All rights reserved.

Open Access: Yes

DOI: 10.1016/j.fusengdes.2009.11.001

Multi-robot cooperation by fuzzy signature sets

Áron Ballagi László T. Kóczy

Publication Name: Imcic 2010 International Multi Conference on Complexity Informatics and Cybernetics Proceedings

Publication Date: 2010-01-01

Volume: 2

Issue: Unknown

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: 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

Digital business ecosystem tools as interoperability drivers

Maria Raffai Miklós Herdon Ádám Péntek Tünde Rózsa

Publication Name: IFIP Advances in Information and Communication Technology

Publication Date: 2010-01-01

Volume: 326

Issue: Unknown

Page Range: 116-127

Description:

Today’s businesses form a highly interconnected network of companies, organisations, technologies, consumers, products and services. The concept of the Digital Business Ecosystem (DBE) has been come life in order to build an Internet-based environment in which businesses will be able to interact with each other more efficiently. In a Digital Ecosystem, a leadership structure is formed in order to be capable of responding to the dynamic needs of the environment. The agent in a Digital Ecosystem can both be a client and a server at the same time. With the same message, agents can simultaneously offer a service to others as a Server and request help as a Client. Industries may have their own systems but they are not yet business ecosystems. Digital ecosystems rely on a technological infrastructure to mediate the formalisation of knowledge in SME networks, the creation of software services, and different type of interactions between SMEs. There are many fields of application in the agro-food industry where interoperability of information system would be essential. Amongst others food tracking and tracing, logistics, SRM and CRM integration all need interoperability solution in a heterogeneous environment. Our prototypes can help in building these cooperative information systems.

Open Access: Yes

DOI: 10.1007/978-3-642-15509-3_11

A new domain decomposition for B-spline neural networks

Cristiano L. Cabrita António E. Ruano László T. Kóczy

Publication Name: Proceedings of the International Joint Conference on Neural Networks

Publication Date: 2010-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

B-spline Neural Networks (BSNNs) belong to the class of networks termed grid or lattice-based associative memories networks (AMN). The grid is a key feature since it allows these networks to exhibit relevant properties which make them efficient in solving problems namely, functional approximation, non-linear system identification, and on-line control. The main problem associated with BSNNs is that the model complexity grows exponentially with the number of input variables. To tackle this drawback, different authors developed heuristics for functional decomposition, such as the ASMOD algorithm or evolutionary approaches [2]. In this paper, we present a complementary approach, by allowing the properties of B-spline models to be achieved by non-full grids. This approach can be applied either to a single model or to an ASMOD decomposition. Simulation results show that comparable results, in terms of approximations can be obtained with less complex models. © 2010 IEEE.

Open Access: Yes

DOI: 10.1109/IJCNN.2010.5596648

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

Evaluation of cooling characteristics of quenchants by using inverse heat conduction methods and property prediction

Imre Felde Tamás Réti

Publication Name: Materials Science Forum

Publication Date: 2010-01-01

Volume: 659

Issue: Unknown

Page Range: 153-158

Description:

A sequential numerical method for characterization of hardening performance of quenchants applied for steel quenching is outlined here. This novel method is based on the specific processing of measured time-temperature samples performed as a result of cooling curve tests. The heat transfer coefficient, as a function of surface temperature, characterises the heat transfer during cooling and is calculated using an iterative inverse algorithm. The heat transfer coefficient is used for calculation of the microstructural constituents and the hardness profile of cylindrical samples of arbitrary diameters. The hardening performance of the media is evaluated by the estimated hardness of the specimen obtained by heat treatment. © (2010) Trans Tech Publications.

Open Access: Yes

DOI: 10.4028/www.scientific.net/MSF.659.153