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Found 5157 publications

Joint experiments on small tokamaks: Edge plasma studies on CASTOR

E. Dufkova J. Brotankova M. Berta R. Dejarnac A. Fonseca A. Talebitaher J. Sentkerestiova B. Tál J. Horacek J. Ferrera A. Ossyannikov M. Sokholov I. Ďuran A. Singh H. Hegazy H. Hegazy E. Del Bosco A. Malaquias M. Hron G. Mank M. Gryaznevich G. Van Oost Y. Kuznetsov P. Peleman S. Zoletnik V. Weinzettl J. Stockel

Publication Name: Nuclear Fusion

Publication Date: 2007-12-01

Volume: 47

Issue: 5

Page Range: 378-386

Description:

The 1st Joint (Host Laboratory) Experiment on 'joint research using small tokamaks' was carried out using the IPP Prague experimental facility 'CASTOR tokamak'. The main experimental programme was aimed at characterizing the edge plasma in a tokamak by using different advanced diagnostic techniques. It is widely recognized that characterization of phenomena occurring at the plasma edge is essential for understanding the plasma confinement in a tokamak. The edge plasma in small and large scale experiments has many similar features, and the results obtained through detailed measurements in a small flexible device such as CASTOR are in many aspects still relevant to those in large tokamaks. Therefore, it is expected that the results of this joint experiment will have general validity. The radial and poloidal structure of electrostatic turbulence was characterized. The effects of edge biasing were analysed. Radiation fluctuations and profile measurements were performed using fast bolometry. Plasma position measurements were performed using novel Hall sensors. © 2007 IAEA, Vienna.

Open Access: Yes

DOI: 10.1088/0029-5515/47/5/002

Progress on joint experiments on small tokamaks

No authors available

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:

Open Access: No

DOI: DOI not available

S-shaped fuzzy flip-flops

Rita Lovassy L. T. Koczy

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

Test calculation for logic and delay faults in digital circuits

J. Sziray

Publication Name: Proceedings International Workshop on Microprocessor Test and Verification

Publication Date: 2007-12-01

Volume: Unknown

Issue: Unknown

Page Range: 20-29

Description:

The paper presents a test calculation principle which serves for producing tests for logic and delay faults in digital circuits. Switch-level logic faults in CMOS circuits are also considered. The delay faults manifest themselves in the incorrect timing behavior of some logic elements within the network. Both single and multiple faults are included. The proposed method handles multi-valued logic, where the number of logic values is unlimited. The level of circuit modeling is also allowed to vary in a wide range: switch level, gate level, functional level, register-transfer level are equally allowed. Both combinational and sequential circuits are considered. The principle is comparatively simple, and it yields an opportunity to be realized by an efficient computer program. © 2006 IEEE.

Open Access: Yes

DOI: 10.1109/MTV.2006.21

On the statistics of ELM filaments measured by fast low field side wall Langmuir probes on TCV

No authors available

Publication Name: 34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts

Publication Date: 2007-12-01

Volume: 31

Issue: 2

Page Range: 820-823

Description:

Open Access: No

DOI: DOI not available

S-shaped fuzzy flip-flops

No authors available

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

Publication Date: 2007-12-01

Volume:

Issue:

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: No

DOI: DOI not available

Grooming-enhanced multicast in multilayer networks with bacterial evolutionary algorithm

No authors available

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

Publication Date: 2007-12-01

Volume:

Issue:

Page Range: 211-225

Description:

In this paper we introduce new, bacterial evolutionary algorithm (BEA) based methods for routing unicast and multicast demands in grooming capable multi-layer optical wavelength division multiplexing (WDM) networks. The methods introduced are compared with both well known heuristic methods, accumulative shortest path heuristic (ASP) and minimum path heuristic (MPH), and as well as with ILP. We prove the strength of our approach by comprehensive simulations in our versatile simulator.

Open Access: No

DOI: DOI not available

FORthSIGHT: An aid for visually impaired people

No authors available

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

Publication Date: 2007-12-01

Volume:

Issue:

Page Range: 647-655

Description:

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

Open Access: No

DOI: DOI not available

A logic model for inference chains in expert systems

J. 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