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Peer-to-peer protocol evaluation in topologies resembling wireless networks. An experiment with Gnutella query engine

Peer-to-peer protocol evaluation in topologies resembling wi...

引用

IEEE International Conference on Networks

作者： B. Bakos G. Csucs L. Farkas J.K. Nurminen Nokia Research Center Budapest Hungary Budapest University슠of슠Technology슠and슠Economics Budapest Hungary NOKIA GROUP Nokia Research Center Finland

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Signature coding over multiple access OR channel

Signature coding over multiple access OR channel

引用

IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： S. Gyori High Speed Networks Laboratory Department of Computer Science and Information Theory Budapest University슠of슠Technology슠and슠Economics Hungary

The problem of signature coding for a multiple access OR channel is studied. For the binomial model of the activity of the users, the Kautz-Singleton code and a random code are compared. The minimal code length of the... 详细信息

关键词： Decoding Databases High-speed networks Laboratories Electronic mail Information retrieval Artificial intelligence Testing Centralized control Communication system control

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Model-based fault-adaptive control of complex dynamic systems

Model-based fault-adaptive control of complex dynamic system...

引用

IEEE Instrumentation and Measurement technology Conference

作者： G. Simon G. Karsai G. Biswas S. Abdelwahed N. Mahadevan T. Szemethy G. Peceli T. Kovacshazy Institute for Software Integrated Systems Vanderbilt University Nashville TN USA Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

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Guiding assistant for disabled in intelligent urban environment

Guiding assistant for disabled in intelligent urban environm...

引用

IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： P.T. Szemes Joo-Ho Lee H. Hashimoto P. Korondi Institute of Industrial Science University of Tokyo Tokyo Japan Integrated Intelligent Systems Laboratory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In this paper, the Intelligent Space concept is applied for helping disabled or blind persons in crowded environments such as train stations, or airports. The main contribution of this paper is a general mathematical (fuzzy-neuro) description of obstacle avoidance method (walking habit) of moving objects (human beings) in a limited area scanned by the Intelligent Space. A mobile robot with extended functions is introduced as a mobile haptic interface, which is assisted by the Intelligent Space. The mobile haptic interface can guide and protect a blind person in a crowded environment with the help of the Intelligent Space. The Intelligent Space learns the obstacle avoidance method (walking habit) of dynamic objects (human beings) by tracing their movements and helps to the blind person to avoid the collision. The prototype of the mobile haptic interface and simulations of some basic types of obstacle avoidance method (walking habit) are presented.

关键词： Intelligent sensors Intelligent robots Intelligent actuators Intelligent agent Humans Haptic interfaces Space technology Computational intelligence Legged locomotion Mobile robots

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Artificial neural network based stereo matching in Intelligent Space

Artificial neural network based stereo matching in Intellige...

引用

IEEE International Conference on Industrial technology (ICIT)

作者： B. Resko P. Baranyi P. Korondi P. Szemes H. Hashimoto Faculty of Electrical Engineering and Informatics Budapest University슠of슠Technology슠and슠Economics Hungary Institute of Industrial Science University of Tokyo Japan

Intelligent Space is a space which has distributed sensory intelligence and is equipped with actuators. The various devices of sensory intelligence cooperate with each other autonomously, and the whole space has high intelligence, where we can easily interact with computers and robots, and get useful services from them. The most important sensors are video cameras achieving stereo vision, where stereo matching is necessary. This paper presents an artificial neural network for the adjustment of two cameras in order to picture the same spot for means of stereoscopic vision. The two cameras are in a master-slave relationship, where the optical center of the slave camera is adjusted to picture the same point as the optical center of the master camera. The task is performed by a biologically inspired artificial neural network, which can be embedded in an analog neural hardware to produce a real time solution for camera control in stereo vision that is faster than existing solutions.

关键词： Artificial neural networks Artificial intelligence Intelligent networks Intelligent robots Intelligent sensors Intelligent actuators Cameras Robot vision systems Stereo vision Master-slave

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Modelling of partially-segmented d/a converters

Modelling of partially-segmented d/a converters

引用

IEEE Instrumentation and Measurement technology Conference

作者： B. Vargha J. Schoukens Y. Rolain Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department ELEC Vrije Universiteit Brussel Brussels Belgium

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Design conditions for space vector modulated three-phase converter to avoid instability

Design conditions for space vector modulated three-phase con...

引用

Power Tech Conference

作者： Z. Suto I. Nagy Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

The analysis, design aspects and numerical results of a current controlled three-phase space vector modulated (SVM) voltage source converter (VSC) are presented. The aim of the current controller of VSC is to track the balanced three-phase sinusoidal reference currents. The current controller includes a complex saturation function in order to avoid overmodulation in the SVM. Due to this strong nonlinearity the study leads to rather unexpected system states. An approximate Poincare" map is derived using stroboscopic sampling with the modulation period of the SVM. Selecting eigenvalues of the system linearized around the desired fixed point is not sufficient to the proper operation. Other stable fixed points or limit cycles can appear. Chaotic states also can develop in the unstable region of the desired fixed point. The main objectives arc to develop the tools for describing the nonlinear behavior, for designing the digital PI controller and to present numerical results.

关键词： Support vector machines Converters Power conversion Functional analysis Voltage control Sampling methods Eigenvalues and eigenfunctions Limit-cycles Chaos Digital control

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Energy-efficient high-speed packet access in WCDMA systems with smart packet dispatching: performance with TCP/IP based applications

Energy-efficient high-speed packet access in WCDMA systems w...

引用

IEEE Conference on Vehicular technology (VTC)

作者： V.V. Phan D.D. Luong R. Baghaie S. Glisic Nokia Networks Oulu Finland Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Nokia Networks Espoo Finland University of Oulu Oulu Finland

This paper presents a performance analysis of high-speed downlink packet access (HSDPA) for TCP/IP applications in WCDMA systems with smart packet dispatching (SPD). The focus is on energy efficiency over burst-error correlated fading channels. The fading-channel characterization thereof is due to low user mobility of the primarily targeted environments for HSDPA applications. Using theoretical analysis and simulation, we show that in burst-error correlated fading channels adapting the time instant of scheduling/dispatching retransmission to fading-channel conditions: (i) significantly reduces the number of retransmissions; and (ii) helps closing the gap of bad channel states allowing the system to operate with much lower fade margin or transmit-power. It thus improves the efficiency of resource utilization in HSDPA. This method is referred to as SPD. In our modeling, we study the impact of fading based on fade duration statistics. The effects of diversity, mobility, and QoS constraints (such as timer for discarding out-of-date packets) are taken into account. The results are used to develop simple and energy-efficient adaptive SPD mechanisms.

关键词： Energy efficiency Multiaccess communication Dispatching TCPIP Fading Performance analysis Downlink Analytical models Resource management Statistics

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Improving quality of service in cellular IP domains

Improving quality of service in cellular IP domains

引用

International Conference on Telecommunications (ConTEL)

作者： B. Rozsas S. Imre Dept. of Telecommun. Budapest Univ. of Technol. & Econ. Hungary Department of Telecommunications Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In today's networks there is a convergence to an integrated IP-based network. lETF's mobile IP handles global macromobility in the IP based infocommunication networks. It is, however, not adapted to micromobility environment; in this local mobility management there are several proposals both for IPv4 and IPv6. These approaches use local entities to support mobility in a well-defined area (domain), and hide the movements inside the domain from mobile IP. Future communication networks will transport not only voice calls but also other multimedia traffic. This type of data is sensible for packet delay, delay variation, packet loss, etc. To meet the requirements of users transmitting such data through the network we have to support better quality of service. In this paper we introduce an efficient solution for improving quality of service in cellular IP micromobility domains. We also show simulation results for our new method.

关键词： Quality of service Protocols Home automation Delay IP networks Spine Base stations Multimedia systems Telecommunication traffic Mobile communication

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Linearization of nonlinear dynamic systems

Linearization of nonlinear dynamic systems

引用

IEEE Instrumentation and Measurement technology Conference

作者： J. Schoukens J. Nemeth G. Vandersteen R. Pintelon P. Crama Department ELEC Vrije Universiteit Brussel Brussels Belgium Department MIS Budapest University슠of슠Technology슠and슠Economics Budapest Hungary IMEC Leuven Belgium

In this paper we propose a method to linearize a nonlinear dynamic system: the nonlinear distortion is reduced, and the linear dynamics are corrected to a flat amplitude and linear phase in a user defined frequency band.

关键词： Frequency Nonlinear distortion Nonlinear dynamical systems Transfer functions Power system modeling Packaging Delay effects Power generation economics Ear Instruments

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