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Modeling The Population of File-Sharing Peer-to-Peer Networks With Branching Processes

Modeling The Population of File-Sharing Peer-to-Peer Network...

引用

IEEE Symposium on Computers and Communications (ISCC)

作者： Trang Dinh Dang Roland Pereczes Sandor Molnar Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In this paper we develop a simple but effective mathematical model to capture the file population dynamics of file-sharing peer-to-peer systems. Our modeling framework is based on the theory of branching processes. We describe analytically the behavior of the proposed model. The precise characterization of the necessary and sufficient conditions of population extinction or explosion is given based on the system parameters. We also present the expected ratio of active, passive and dead peers for the long-term regime. We validate and demonstrate our results in several simulation studies. Based on our results we propose a number of engineering guidelines to the design and control of file-sharing P2P systems.

关键词： Peer to peer computing Performance analysis Sufficient conditions Explosions Design engineering Guidelines Control systems High-speed networks Laboratories Informatics

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Transient Power Frequency Overvoltages Transferred to Low Voltage Networks from the EPR of HV and MV Transformer Stations

Transient Power Frequency Overvoltages Transferred to Low Vo...

引用

IEEE International Symposium on Electromagnetic Compatibility and Electromagnetic Ecology

作者： Gyorgy Varju Jozsef Ladanyi Department of Electric Power Engineering Budapest University슠of슠Technology슠and슠Economics Hungary

The transient power frequency overvoltages appearing in the low voltage (LV) supply networks are causing increasing number of damages both in electrical equipment (household, office etc.) containing electronic control parts and in telecommunications apparatus especially in their line cards. Accordingly to the practical experiences one significant source of these transient overvoltages is the transfer of the earth potential rise (EPR) caused by the earth faults occurring in the high voltage substations. The paper describes the ways of identification of the EPR caused by phase-to-earth fault in high voltage (HV) networks and double earth faults in medium voltage (MV) networks with not directly earthed neutral. The mechanism of the voltage transfer and the relative importance of the different parameters in the magnitude of the transferred voltages are also investigated.

关键词： Frequency Surges Low voltage Paramagnetic resonance Earth Voltage control Telecommunication control Substations Fault diagnosis Medium voltage

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Design of Luenberger Observer for Glucose-Insulin Control via Mathematica

Design of Luenberger Observer for Glucose-Insulin Control vi...

引用

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

作者： Levente Kovacs Bela Palancz Zoltan Benyo Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Hungary Department of Photogrammetry and Geoinformatics Budapest University슠of슠Technology슠and슠Economics Hungary

Many articles dealing with insulin-glucose control have been published in the last decades, and they mostly assumed that all the system state variables are available for feedback. However, this is not usually the case, or they are not so cheap in practice as blood glucose measurements are. In this paper the use of the reduced-order estimator (also known as the Luenberger observer) is considered in symbolic form employing polynomial control system application of mathematica for the three-state minimal Bergman model, as this can be used to reconstruct those state variables that are hard to be recovered directly from the system outputs: remote compartment insulin and plasma insulin. Nonlinear closed loop simulations with H 2 /H infin control (disturbance rejection LQ method) showed that the observer, which is faster than the system itself, can provide a very good state recovery performance.

关键词： Insulin Control systems State feedback Blood Sugar State estimation Observers Polynomials Control system synthesis Mathematical model

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Testbed for Wireless Adaptive Signal Processing Systems

Testbed for Wireless Adaptive Signal Processing Systems

引用

IEEE Instrumentation and Measurement technology Conference

作者： Gyorgy Orosz Laszlo Sujbert Gabor Peceli Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Due to the several attractive features of wireless devices they are more and more expansively used, but the deployment of wireless sensors in control applications is not spread yet because of the unreliable data transfer. This paper introduces a testbed which serves as a platform for investigations of wireless closed loop adaptive signal processing and control systems. The novelty of this testbed is that it makes possible the practical tests of algorithms in wireless environment. Since the traditional signal processing algorithms are not prepared for peculiar problems that emerge because of wireless data transfer (e.g. data loss), the exhaustive study of their behavior is necessary. This test system plays an important role in these investigations. Since the testbed offers also an application (the active noise control), algorithms can be studied in the same circumstances so ensuring the comparability of different structures.

关键词： System testing Adaptive signal processing Wireless sensor networks Signal processing algorithms Control systems Process control Active noise reduction Communication system control MIMO Acoustic testing

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Parameter Estimation of Coupled Road-Vehicle Systems

Parameter Estimation of Coupled Road-Vehicle Systems

引用

International Workshop on Soft Computing Applications (SOFA)

作者： Peter Gaspar Laszlo Nadai John von Neumann Faculty of Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Transportation Informatics and Telematics Knowledge Center Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Using a novel gray-box identification paradigm we can reconstruct both vehicle and road model parameters with one set of measurements. In the paper we present a non-linear parameter estimation method to determine the parameters of a full-car suspension system. Since there are non-measured variables that are necessary for the identification, special numerical techniques need to be applied, such as a numerical integration of the measured signals. It is also shown that the selection of the sampling time might be critical in this type of application. Based on the results of this identification procedure the road disturbance can be reconstructed. The road roughness estimation is based on this signal using autoregressive model.

关键词： Parameter estimation Informatics Road vehicles Signal processing Displacement measurement Pollution measurement Rough surfaces Surface roughness Surface reconstruction Damping

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Fairness in Capacitated Networks: A Polyhedral Approach

Fairness in Capacitated Networks: A Polyhedral Approach

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IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： G. Retvari J. J. Biro T. Cinkler Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The problem of fair and feasible allocation of user throughputs in capacitated networks is investigated. The main contribution of the paper is a novel geometric approach, which facilitates to generalize several throughput allocation strategies, most importantly max-min fairness, from the traditional "fixed-path" model to a more versatile, routing-independent model. We show that the set of throughput configurations realizable in a capacitated network makes up a polyhedron, which gives rise to a max-min fair allocation completely analogous to the conventional one. An algorithm to compute this polyhedron is also presented, whose viability is demonstrated by comprehensive evaluation studies.

关键词： Throughput Solid modeling Resource management Computer networks Communications Society High-speed networks Laboratories Informatics Electronic mail Telecommunication computing

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On-line time-scaling control of a kinematic car with one input

On-line time-scaling control of a kinematic car with one inp...

引用

Mediterranean Conference on Control and Automation (MED)

作者： B. Kiss E. Szadeczky-Kardoss Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

This paper reports a time-scaling scheme to realize a tracking controller for the non-differentially flat model of the kinematic car with one input which is the steering angle or the angular velocity of the steering angle. The longitudinal velocity of the car is a measurable external signal and cannot be influenced by the controller. Using an on-line time-scaling, driven by the longitudinal velocity of the car, by a scaling output of the tracking controller, and by their time derivatives up to the second order, one can achieve exponential tracking of any sufficiently smooth reference trajectory, similar to the differentially flat case with two control inputs. The price to pay is the modification of the finite traveling time of the reference trajectory according to the time-scaling.

关键词： Kinematics Velocity control Velocity measurement Trajectory Mobile robots Angular velocity control Feedback Remotely operated vehicles Adaptive control Control systems

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Hierarchical Paging- Efficient Location Management

Hierarchical Paging- Efficient Location Management

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European Conference on Universal Multiservice Networks (ECUMN)

作者： M. Szalay S. Imre Department of Telecommunications Budapest University슠of슠Technology슠and슠Economics Hungary

This paper introduces a new location management algorithm called hierarchical paging. A mathematical model for the proposed scheme is also presented. We have compared our solution to two other location management solutions using simulations. The environment, setup, simulation details and results are presented in this paper. It is concluded that there is a wide range of parameters where hierarchical paging is more efficient than the other location management algorithms

关键词： Femtocell networks Mathematical model Mobile radio mobility management technology management Resource management Terminology Environmental economics Mobile communication Frequency Routing

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Ethernet over WDM: Optimization for resilience and scalability

Ethernet over WDM: Optimization for resilience and scalabili...

引用

International Workshop on Design of Reliable Communication Networks (DRCN)

作者： Andras Kern Istvan Moldovan Peter Hegyi Tibor Cinkler Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The emerging Ethernet technologies deployed in metro networks provide services based on pure Ethernet. Low cost optical Ethernet interfaces are used to interconnect different sites. Then, the use of wavelength division multiplexing technology with optical Ethernet is clearly the next step in building cost efficient metro networks. In this paper we propose a novel architecture and configuration methods that make metro Ethernet better scale to larger traffic and to covering larger areas that consist of more nodes promising significantly lower costs. The idea is to utilize wavelength paths optimally for bypassing certain Ethernet nodes and by employing traffic grooming according to different strategies we propose and compare. The result is always a tradeoff between the cost of the solution and the achievable throughput. Our methods are based on integer linear program and combinatorial heuristics. The proposed architecture and the optimization framework support very fast recovery upon a failure. Furthermore, it handles the shared risk link groups to ensure that the working and the backup paths should be physically disjoint. The method also supports traffic engineering goals: network utilization and resilience. Furthermore, it can be well used to enforce limitations on the depth and diameter of the obtained logical topology that allows scalability.

关键词： Ethernet networks Wavelength division multiplexing Resilience Scalability Costs Optical interconnections Telecommunication traffic Optical fiber networks Buildings Throughput

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Deciding the Convex Separability of Pattern Sets

Deciding the Convex Separability of Pattern Sets

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IEEE International Workshop on Intelligent Data Acquisition and Advanced Computing Systems: technology and Applications

作者： Gabor Takacs Bela Pataki Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Deciding the convex separability of the classes is an interesting question in the data exploration phase of building classification systems. In this paper we propose an efficient algorithm for deciding the convex separability of two point sets in R d . We compare our algorithm with conventional methods on 6 benchmark problems, and demonstrate that our algorithm is significantly faster.

关键词： Machine learning algorithms Polynomials Conferences Data acquisition Economic forecasting Information systems Pattern recognition Machine learning Intelligent systems Intelligent structures

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