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Found 6278 publications

Multilayer perceptron implemented by fuzzy flip-flops

László Gál Rita Lovassy László T. Kóczy

Publication Name: IEEE International Conference on Fuzzy Systems

Publication Date: 2008-11-07

Volume: Unknown

Issue: Unknown

Page Range: 1683-1688

Description:

The paper introduces a novel method for constructing Multilayer Perceptron (MLP) Neural Networks (NN) with the aid of fuzzy systems, particularly by deploying fuzzy J-K flip-flops as neurons. The next state Q(t+1) of the J-K fuzzy flip-flops (F3) in terms of input J can be characterized by a more or less S-shaped function, for each F3 derived from the Yager, Dombi, and Fodor norms and co-norms. In this approach, J represents the neuron input. The other input K is wired to the complemental output (K=1-Q), thus an elementary fuzzy sequential unit with a single input and a single output is received. The algebraic F3 having linear J-Q(t+1) characteristics is added to the above three. The paper proposes the investigation of the possibility of constructing multilayer perceptrons from such real fuzzy hardware units. Each of the four candidates for F3-based neurons is examined for its training capability by evaluating and comparing the approximation capabilities for two different transcendental functions. Simulation results are presented. © 2008 IEEE.

Open Access: Yes

DOI: 10.1109/FUZZY.2008.4630597

Assumption of medical risks and the problem of medical liability in the ancient Roman law

Ágnes Váradi

Publication Name: Orvosi Hetilap

Publication Date: 2008-11-02

Volume: 149

Issue: 44

Page Range: 2091-2093

Description:

The claim of an individual to assure his health and life, to assume and compensate the damage from diseases and accidents, had already appeared in the system of the ancient Roman law in the form of many singular legal institutions. In lack of a unified archetype of regulation, we have to analyse the damages caused in the health or corporal integrity of different personal groups: we have to mention the legal interpretation of the diseases or injuries suffered by serves, people under manus or patria potestas and free Roman citizens. The fragments from the Digest od Justinian do not only demonstrate concrete legal problems, but they can serve as a starting point for further theoretical analyses. For example: if death is the consequence of a medical failure, does the doctor have any kind of liability? Was after-care part of the healing process according to the Roman law? Examining these questions, we should not forget to talk about the complex liability system of the Roman law, the compensation of the damages caused in a contractual or delictual context and about the lex Aquilia. Although these conclusions have no direct relation with the present legal regulation of risk assumption, we have to see that analysing the examples of the Roman law can be useful for developing our view of a certain theoretical problem, like that of the modern liability concept in medicine as well.

Open Access: Yes

DOI: 10.1556/OH.2008.28477

Indicators of sustainability

Guzli Piroska Bulla Miklós

Publication Name: Journal of Landscape Ecology

Publication Date: 2008-10-23

Volume: 6

Issue: 1-2

Page Range: 1-15

Description:

No description provided

Open Access: Yes

DOI: DOI not available

Domain decomposition method with an interface preconditioner for frictionless contact problem

Lotfi Abdelhakim

Publication Name: Aip Conference Proceedings

Publication Date: 2008-10-22

Volume: 1048

Issue: Unknown

Page Range: 359-363

Description:

The present paper is concerned with the frictionless bilateral or unilateral contact problem between two elastic bodies. An algorithm is introduced to solve the resulting finite element system by a non-overlapping domain decomposition method. This technique enable us to transform the solution of the global problem to the solutions of the elasticity equations for each body separately and the solution of the Schur complement problem on the contact surface. The main goal of this work is the construction of the interface preconditioner for the Schur complement problem. The solution is obtained by using a successive approximation method. Finally, some numerical results of the proposed method are given. © 2008 American Institute of Physics.

Open Access: Yes

DOI: 10.1063/1.2990933

A mathematical model for the middle ear ventilation

G. Y. Molnarka M. Fücsek E. M. Miletics

Publication Name: Aip Conference Proceedings

Publication Date: 2008-10-22

Volume: 1046

Issue: Unknown

Page Range: 106-109

Description:

The otitis media is one of the mostly existing illness for the children, therefore investigation of the human middle ear ventilation is an actual problem. In earlier investigations both experimental and theoretical approach one can find in ([1]-[3]). Here we give a new mathematical and computer model to simulate this ventilation process. This model able to describe the diffusion and flow processes simultaneously, therefore it gives more precise results than earlier models did. The article contains the mathematical model and some results of the simulation. © 2008 American Institute of Physics.

Open Access: Yes

DOI: 10.1063/1.2997288

Artifacts of grid-based electron structure calculations

János Pipek Szilvia Nagy

Publication Name: Chemical Physics Letters

Publication Date: 2008-10-13

Volume: 464

Issue: 1-3

Page Range: 103-106

Description:

Electron structure calculations over equidistant grids represent physical observables by matrices usually chosen as the projection of the corresponding operator in the Schrödinger picture onto the subspace expanded by the basis set of the given grid resolution. It is shown that any matrix representation compatible with the translational symmetry of the lattice suffers from essential difficulties. Especially the momentum and related operators like the kinetic energy show anomalous behavior, moreover, the required canonical commutation relation can never be satisfied. © 2008 Elsevier B.V. All rights reserved.

Open Access: Yes

DOI: 10.1016/j.cplett.2008.08.091

Fuzzy flip-flop based neural network as a function approximator

László Gál Rita Lovassy László T. Kóczy

Publication Name: Cimsa 2008 IEEE Conference on Computational Intelligence for Measurement Systems and Applications Proceedings

Publication Date: 2008-09-26

Volume: Unknown

Issue: Unknown

Page Range: 44-49

Description:

Artificial neural networks and fuzzy logic systems, in the context of approximate reasoning, share common features and techniques. A family of fuzzy flip-flops is proposed, based on an artificial neural network-like structure which is suitable for approximating many-input one-output nonlinear functions. The neurons in the multilayer perceptron networks typically employ sigmoidal activation functions. The next state of the fuzzy J-K flip-flops (F3) using Yager and Dombi operators present quasi-S-shaped characteristics. The paper proposes the investigation of the possibility of constructing multilayer perceptrons from such fuzzy units. Each of the two candidates for F 3-based neurons is examined for its training capability by evaluating and comparing the approximation properties in the context of different transcendental functions with one-input and multi-input cases. Simulation results are presented. ©2008 IEEE.

Open Access: Yes

DOI: 10.1109/CIMSA.2008.4595830

Improvements to the bacterial memetic algorithm used for fuzzy rule base extraction

János Botzheim László Gál László T. Kóczy

Publication Name: Cimsa 2008 IEEE Conference on Computational Intelligence for Measurement Systems and Applications Proceedings

Publication Date: 2008-09-26

Volume: Unknown

Issue: Unknown

Page Range: 38-43

Description:

In this paper we discuss new methods to improve the Bacterial Memetic Algorithm (BMA) used for fuzzy rule base extraction. The first two methods are knot order violation handling methods which improves the performance of the BMA rather in the case of more complex fuzzy rule base. The third method is a new modification of the BMA in which the order of the operators is modified. This method improves the performance of the BMA rather in the case of less complex fuzzy rule base. ©2008 IEEE.

Open Access: Yes

DOI: 10.1109/CIMSA.2008.4595829

Experimental result on supersonic flow simulation on emulated digital CNN-UM

Sándor Kocsárdi Zoltán Nagy Árpád Csík Péter Szolgay

Publication Name: Proceedings of the IEEE International Workshop on Cellular Neural Networks and their Applications

Publication Date: 2008-09-23

Volume: Unknown

Issue: Unknown

Page Range: 5

Description:

In the area of mechanical, aerospace, chemical and civil engineering the solution of partial differential equations (PDEs) has been one of the most important problems of mathematics for a long time. In this field, one of the most exciting areas is the simulation of fluid flow, which involves for example problems of air, sea and land vehicle motion. ©2008 IEEE.

Open Access: Yes

DOI: 10.1109/CNNA.2008.4588636