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An optimization neural network model with lossy dynamics and time-varying activation functions

An optimization neural network model with lossy dynamics and...

引用

International Joint Conference on Neural Networks (IJCNN)

作者： J.J. Biro Z. Heszberger Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The paper is concerned with continuously operating optimization neural networks with lossy dynamics. As the main feature of the neural model time-varying nature of neuron activation functions is introduced. The model presented is general in the sense that it covers the cases of neural networks for combinatorial optimization (Hopfield-like networks) and neural models for optimization problems with continuous decision variables (i.e., Kennedy and Chua's neural network). Besides the rigorous stability analysis of the proposed neural network it is also highlighted the importance of the lossy dynamics, it is shown how to derive lossy versions of improved Hopfield neural models from it and explored the relations to other optimization neural systems.

关键词： Neural networks Hopfield neural networks Neurons Computer networks Analog circuits Differential equations Informatics Paper technology Electronic mail Stability analysis

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Acoustic analysis of the infant cry: classical and new methods

Acoustic analysis of the infant cry: classical and new metho...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： G.Jr. Varallyay Z. Benyo A. Illenyi Z. Farkas L. Kovacs Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Hungary Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Hungary Heim Pál Hospital for Sick Children Budapest Hungary

In the last few decades many papers have written about the analysis of the infant cry. The acoustic analysis has a shorter history than emotional, physiological, etc. investigations. This paper deals with classical and new methods of acoustic analysis of the infant cry. The final goal is to detect hearing disorders according to the crying at the earliest possible moment. Classical acoustic methods were reproduced and compared with solutions, which were not available before. This paper most of all deals with the characteristics of the fundamental frequency of the cry in the time and in the frequency domain.

关键词： Pediatrics Auditory system Frequency Feedback Deafness Speech Hospitals Power harmonic filters History Acoustic signal detection

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Fractal analysis and modeling of VoIP traffic

Fractal analysis and modeling of VoIP traffic

引用

NETWORKS International Telecommunications Network Strategy and Planning Symposium

作者： Trang Dinh Dang B. Sonkoly S. Molnar High Speed Lab Department of Telecommunication & Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In This work a fractal analysis study of VoIP traffic is presented. The characteristics of measured VoIP traffic on both call and packet level have been investigated. The results support the popular Poisson process for VoIP call arrival modeling but we argue that the call holding times follow heavy-tailed distributions rather than exponential distributions. We propose the generalized Pareto distribution for modeling the call holding times. At the packet level we have found that the exponential modeling of on and off periods is also inappropriate and heavy-tailed characteristics have been identified in case of all the investigated VoIP codecs. The generalized Pareto distribution can be used as an accurate model for the on and off periods too. In the analysis we revealed that the aggregated VoIP traffic has fractal characteristics and we suggest the fractional Gaussian noise model for the aggregated VoIP traffic.

关键词： Fractals Internet telephony Traffic control Telecommunication traffic Codecs Exponential distribution Detectors High-speed networks Electronic mail Speech analysis

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Optimal glucose-insulin control in /spl Hscr//sub 2/ space

Optimal glucose-insulin control in /spl Hscr//sub 2/ space

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： L. Kovacs B. Palancz Zs. Almassy Z. Benyo Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Hungary Department of Photogrammetry Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Pediatric Department Heim Pál Children''s Hospital Budapest Hungary

In this case study optimal glucose-insulin control in the Hardy /spl Hscr//sub 2/-space is presented for diabetic patients under intensive care. The analysis is based on a modified two-compartment model. First the classical LQ optimal control design method is considered, and then its extension the so called disturbance rejection LQR (LQ rejection) method, based on the MINIMAX differential game is applied to control design. To demonstrate the results of these two methods, the simulation of the dynamical performance of the non-linear closed loop system in case of food (sugar) intake has been carried out. For the symbolic and numeric computations Mathematica and Matlab-Simulink are used.

关键词： Optimal control Mathematical model Sugar Diabetes Control systems Biological system modeling Insulin Plasma measurements Minimax techniques Control design

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Mitigating the untrusted terminal problem using conditional signatures

Mitigating the untrusted terminal problem using conditional ...

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International Conference on Information technology: Coding and Computing (ITCC)

作者： I.Z. Berta L. Buttyan I. Vajda Laboratory of Cryptography and Systems Security Department of Telecommunications Budapest University슠of슠Technology슠and슠Economics Hungary

We study the problem of how a user at an untrusted terminal can generate digital signatures with the help of a smart card. This problem may arise in many practical applications; an example would be a user generating an electronic check at a merchant's terminal in a shop. The danger is that the terminal can obtain a signature from the card on an arbitrarily chosen document, that is different from the one displayed on the screen and confirmed by the user. We propose a solution to this problem which is based on a new concept called conditional signature. This leads to a new paradigm where digital signatures are not considered as non-repudiable proofs, at least until a short deadline.

关键词： Smart cards Digital signatures Cryptography Protocols Humans Laboratories Security Message authentication Electronic commerce Protection

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Powerful tools for thermal characterisation of MEMS

Powerful tools for thermal characterisation of MEMS

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IEEE SENSORS

作者： P. Furjes G. Bognar I. Barsony Research Institute for Technical Physics and Material Sciences Budapest Hungary Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Thermal aspects of the design and fabrication of sensor structures based on thermally isolated heater filaments (Ducso, Cs. et al., Sensors and Actuators, vol.A60, p.235-9, 1997) were investigated with special attention to their dynamic properties. Thermal engineering was aided by high performance simulation methods, such as finite element modelling (COSMOS) and thermal equivalent circuit simulation using successive network reduction (SUNRED) method. The detailed static and dynamic thermal behaviour of the structure was experimentally characterised applying the high resolution thermography system of Thermosensorik GmbH and the thermal transient tester (T3Ster) of MicReD Ltd.

关键词： Micromechanical devices Sensor phenomena and characterization Thermal sensors Thermal engineering Circuit simulation Fabrication Actuators Power engineering and energy Finite element methods Equivalent circuits

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Short-term stabilization of opto-electronic oscillators by multiple optical resonators

Short-term stabilization of opto-electronic oscillators by m...

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International Topical Meeting on Microwave Photonics (MWP)

作者： B. Horvath T. Banky T. Berceli Department of Broadband Infocommunication Systems and Electromagnetic Theory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

We will give a novel explanation on the mode separation and the single frequency operation of multi-loop photonic oscillators with appropriate fiber lengths and powers, supported by numerous measurements.

关键词： Oscillators Optical resonators Optical fiber theory Band pass filters Power distribution Radio frequency Integrated optics Optical modulation Optical waveguides Power system economics

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Comparison of zeroth- and first-order semi-discretizations for the delayed Mathieu equation

Comparison of zeroth- and first-order semi-discretizations f...

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IEEE Conference on Decision and Control

作者： T. Insperger G. Stepan J. Turi Department of Applied Mechanics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary University of Technology Dallas TX USA

Semi-discretization method is applied to construct stability charts for periodic delay-differential equations. Zeroth-, improved zeroth- and first-order methods are used to construct approximate finite dimensional Floquet transition matrices for the delayed Mathieu equation and stability charts are determined. Since the stability boundaries of the delayed Mathieu equation are known in closed form, the convergence of different order approximations can be studied by computer simulations. Stability boundaries and computation times obtained by different time steps and different orders are compared.

关键词： Stability Delay effects Delay systems Differential equations Convergence Control systems Computer simulation Control design State-space methods Computational modeling

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Natural language question processing for hungarian deep web searcher

Natural language question processing for hungarian deep web ...

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International Conference on Computational Cybernetics (ICCC)

作者： D. Tikk Z.T. Kardkovacs Z. Andriska G. Magyar A. Babarczy I. Szakadat Department of Telecom & Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Axelero Rt Budapest Hungary

The paper summarizes the first results of our ongoing research and development project, called "In the Net of Words" (NoW), funded by the National R+D Program in Hungary. The project aims at creating a complex search interface that incorporates - beside the usual keyword-based search functionality - deep Web search, Hungarian natural language question processing, image search support by visual thesaurus. One of the most crucial parts of the system is the transformation of natural language questions to adequate SQL queries that is in accordance with schema and attribute convention of contracted partner databases. This transformation is performed in three steps: natural language question processing, context recognition, and SQL transformation. In this paper we describe in details the first step

关键词： Natural languages Search engines Databases Internet Sea surface Web pages Telecommunications Informatics Research and development Web search

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Path integrity aware traffic engineering [telecom traffic]

Path integrity aware traffic engineering [telecom traffic]

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： A. Takacs A. Csaszar J. Biro R. Szabo T. Henk High Speed Networks Laboratory Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Dynamic traffic engineering requires the operation of load balanced routing. Load sharing, however, implies a thus far neglected, currently hidden problem: insufficient path integrity. Since load balancing requires changing the routes of traffic in order to achieve proper load distribution, path changes of ongoing communications go hand in hand with dynamic traffic engineering. Frequent path changes will not only degrade the performance of current TCP based applications but they will also dramatically influence the grade of service experienced by future QoS critical applications. To overcome this problem, we present a two level hashing based mechanism for route pinning under load balancing. We analytically formalise the path integrity and convergence time achievable for our routing model, and use these formulas for dimensioning path integrity aware load balancing.

关键词： Routing Telecommunication traffic Tellurium Load management Degradation Protocols Resource management Spine High-speed networks Laboratories

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