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Estimation of Multiplexing Gain on Small Business VoIP Networks

Estimation of Multiplexing Gain on Small Business VoIP Netwo...

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IEEE Symposium on Computers and Communications (ISCC)

作者： Szabolcs Mate Kis Jozsef Biro Sandor Szekely Department of Telecommunication and Media Informatics Budapest University슠of슠Technology슠and슠Economics Hungary Nokia Siemens Networks GmbH and Company KG Munich Germany

In this paper we shall establish a set of dimensioning rules for different VoIP networks using various measurement-based user behavior properties as input parameters. In order to solve the problem of dimensioning VoIP networks we focus on the aggregated VoIP links. These dimensioning procedures undoubtedly play an important role in efficiently operating extreme telephony networks like call centers and Small Businesses. Such special networks produce traffic characteristics significantly different from those of PSTN networks or general VoIP networks. Our purpose is to use simple input parameters in order to estimate the traffic characteristics of a certain link. By keeping the QoS parameters in sufficient range we present a solution to approximate link usage. The communication may be characterized with special properties such as few but very active subscribers, high internal call rate, very long-, or very short call durations, etc. In this way a simple and useful dimensioning method is achieved, utilizing the very properties of such networks, which may reduce the number of required voice channels operated.

关键词： Internet telephony Telecommunication traffic IP networks Costs Informatics Business communication Search engines Companies Bandwidth Access protocols

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A Simple Control Solution for Traction Motor Used in Hybrid Vehicles

A Simple Control Solution for Traction Motor Used in Hybrid ...

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International Symposium on Applied Computational Intelligence and Informatics ( SACI)

作者： Zsuzsa Preitl Peter Bauer Jozsef Bokor Department of Control and Transport Automation Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

Electric motors (EM) are widely used in industry for a large variety of applications, such as traction motors used in electric and hybrid vehicles. In this paper a hybrid electric vehicle is considered, which contains both an internal combustion engine and an EM. Without focusing on the other components of the vehicle, the EM is treated in detail, both regarding modelling aspects and control solutions. After a brief modelling of the plant, two cascade speed control solutions are presented: first a classical PI+PI cascade control solution is presented. Then a correction term is introduced as a PI + a non-homogenous structured PI controller solution. The controllers are developed using the Modulus-Optimum method for the inner loop, and the extended symmetrical optimum method, corrected based on the 2p-SO-method, for the outer loop (for a more efficient disturbance rejection). Simulations were performed using numerical values taken from a real application consisting in a hybrid vehicle prototype, showing satisfactory behaviour.

关键词： Traction motors Hybrid electric vehicles Power system modeling Mathematical model Automatic control Automation Internal combustion engines Velocity control Control systems Generators

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3D measurement technique for convex shape acquisition

3D measurement technique for convex shape acquisition

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： Andras Rovid Takeshi Hashimoto Department of Electrical and Electronics Engineering Shizuoka University Hamamatsu Japan Department of Vehicle and Light Weight Structure Analysis Budapest University슠of슠Technology슠and슠Economics Hungary

The shape of the objects is an important property, which can be used by many applications. There are simple shapes, which can be acquired by the most of the 3D measurement devices. There are very complex surfaces, as well, which acquisition can be performed only by a small subset of the recently used techniques. The goal of our work is to develop a measurement device, which is able to measure complicated surfaces containing hidden areas with high precision. The algorithm is optimized for real-time processing.

关键词： Measurement techniques Shape measurement Cameras Image reconstruction Area measurement Robots Pulse measurements Shape control Control system analysis Quality control

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Application of hybrid c-means clustering models in inhomogeneity compensation and MR brain image segmentation

Application of hybrid c-means clustering models in inhomogen...

引用

International Symposium on Applied Computational Intelligence and Informatics ( SACI)

作者： Laszlo Szilagyi Sandor M. Szilagyi Balazs Benyo Zoltan Benyo Faculty of Technical and Human Sciences Sapientia Hungarian Science University of Târgu Mureş Romania Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Intensity inhomogeneity or intensity non-uniformity (INU) is an undesired phenomenon that represents the main obstacle for MR image segmentation and registration methods. Various techniques have been proposed to eliminate or compensate the INU, most of which are embedded into clustering algorithms. This paper proposes a hybrid C-means clustering approach to replace the FCM algorithm found in several existing solutions. The novel clustering model is assisted by a pre-filtering technique for Gaussian and impulse noise elimination, and a smoothening filter that helps the C-means algorithm at the estimation of inhomogeneity as a slowly varying additive or multiplicative noise. The slow variance of the estimated INU is assured by a smoothening filter that performs a context dependent averaging, based on a morphological criterion. The experiments using 2-D synthetic phantoms and real MR images show that the proposed method provides more accurate and more efficient segmentation than the FCM based approach. The produced segmentation and fuzzy membership values can serve as excellent support for 3-D registration and segmentation techniques.

关键词： Brain modeling Image segmentation Clustering algorithms Magnetic resonance imaging Gaussian noise Filters Additive noise Imaging phantoms Filtering Iterative algorithms

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On the applicability of the on-off type approximation of the effective bandwidth function

On the applicability of the on-off type approximation of the...

引用

IEEE International Conference on Communications (ICC)

作者： A. Szlavik G. Seres J. Zatonyi J. Biro Traffic Analysis and Network Performance Laboratory Ericsson Research Hungary Budapest Hungary High Speed Networks Laboratory DTT Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

This paper reviews the applicability of simplified bandwidth requirement estimators that need only the mean and the peak rates of traffic flows as input, instead of the full statistical description of the traffic required by their original form. The estimators approximate the effective bandwidth function, the key component of the bandwidth requirement estimate, with the logarithmic moment generating function of on-off source. It is demonstrated that this on-off type approximation has to be used with care as it results in a loss of information about the traffic streams. This is manifested in the reduction of the advanced bandwidth estimator method of the many sources asymptotics into the basic Chernoff-type technique. As a consequence bandwidth requirement estimator built on/off type approximation overlook the multiplexing gain occurring in the buffers, which results in overly conservative estimates close or equal to the peak rate when applied to traffic aggregates.

关键词： Bandwidth Telecommunication traffic Communication system traffic control Delay Laboratories Aggregates Performance analysis High-speed networks Capacity planning Jitter

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SpeedDetect: A Simple TCP Extension for Handling Sudden Capacity Increase

SpeedDetect: A Simple TCP Extension for Handling Sudden Capa...

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Conference on Next Generation Internet Networks, NGI

作者： Gergely Biczok Gabor Nemeth Peter Tarjan Ferenc Kubinszky Andras Veres Traffic Analysis and Network Performance Laboratory Ericsson Research Limited Sweden Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Hungary

Emerging broadband mobile cellular networks are inherently heterogeneous due to the co-existence of multiple wireless access technologies. In such a network sudden capacity changes are bound to happen due to inter-system handovers, user mobility and flow dynamics. Existing congestion control protocols are shown to deal sufficiently with capacity drops but tend to reach full link utilization slowly after abrupt capacity increases. In this paper we propose SpeedDetect, a simple, sender-side TCP extension for handling sudden capacity increase. The key idea behind our approach is to improve link utilization by explicitly detecting increased link capacity then triggering the underlying congestion control scheme to an aggressive probing regime. We evaluate the performance of SpeedDetect with testbed experiments and simulations. Our findings suggest that the proposed mechanism can significantly improve the reaction time of TCP by detecting sudden capacity increase quickly and consistently. Furthermore, our approach retains the RTT-fairness of the underlying TCP and exhibits favorable inter-protocol fairness towards standard TCP NewReno.

关键词： Algorithm design and analysis Land mobile radio cellular systems Testing Wireless networks Performance analysis Nonhomogeneous media Informatics Communication system traffic control Access protocols Wireless LAN

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Uncertainty Modeling and Robust Control of LTI Systems Based on Integral Quadratic Constraints

Uncertainty Modeling and Robust Control of LTI Systems Based...

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IEEE International Conference on Intelligent Engineering Systems (INES)

作者： G. Rodonyi B. Lantos J. Bokor Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Hungary Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Hungary

Based on experimental data a joint method for nominal model error modeling and robust control is presented for linear time-invariant (LTI) systems. The goal of the method is to design a controller that attain robust quadratic performance and stability of the closed loop, and simultaneously construct an uncertainty model that is not invalidated by measurement data. The problem is motivated by the need for non-conservative and reliable modeling of neglected or unknown dynamics and effect of outer disturbances. The components of dynamic errors and disturbances are balanced in the model in order to improve conditions for designing the specified controller. The problem statement and solution is formulated in terms of integral quadratic constraints (IQCs) and linear matrix inequalities (LMIs). The resulted method is a modified version of the well-known DK-iteration in μ -synthesis.

关键词： Uncertainty Robust control Error correction Electronic mail Robust stability Uncertain systems Context modeling Automation Control engineering Information technology

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Reference signal control of the TORA system: a TP model transformation based approach

Reference signal control of the TORA system: a TP model tran...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Z. Petres B. Resko P. Baranyi Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Hungary Integrated Intelligent Systems Japanese-Hungarian Laboratory Budapest University슠of슠Technology슠and슠Economics Hungary

This paper presents a case study of the TP (tensor product) model transformation in the control of a nonlinear benchmark problem. We design a nonlinear controller of translational oscillation with an eccentric rotational proof mass actuator (TORA) system via TP model transformation and LMI (linear matrix inequality) based controller design technique that is also capable of the reference signal tracking control. The main contribution of the paper is to show that both numerical methods the TP model transformation and the LMI can readily be executed by computer independently on the given problem and without analytical derivations, which, hence, leads to a fast way of controller designs for a class of engineering control problems. Numerical simulation is used in the paper to provided empirical validation of the control results.

关键词： Automatic control Tensile stress Weight control Nonlinear control systems Control design Signal design Intelligent systems Laboratories Automation Electronic mail

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Barter-based cooperation in delay-tolerant personal wireless networks

Barter-based cooperation in delay-tolerant personal wireless...

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IEEE International Symposium on World of Wireless Mobile and Multimedia Networks (WoWMoM)

作者： Levente Buttyan Laszlo Dora Mark Felegyhazi Istvan Vajda Laboratory of Cryptography and Systems Security (CrySyS) Budapest University슠of슠Technology슠and슠Economics Hungary Laboratory for Computer Communications and Applications EPF Lausanne Lausanne Switzerland

In this paper, we consider the application of delay-tolerant networks to personal wireless communications. In these networks, selfish nodes can exploit the services provided by other nodes by downloading messages that interest them, but refusing to store and distribute messages for the benefit of other nodes. We propose a mechanism to discourage selfish behavior based on the principles of barter. We develop a game-theoretic model in which we show that the proposed approach indeed stimulates cooperation of the nodes. In addition, the results show that the individually most beneficial behavior leads to the social optimum of the system.

关键词： Wireless networks Wireless communication Laboratories Application software Batteries Ad hoc networks Cryptography Communication system security Computer security Computer applications

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Fuzzy communication and cooperation of mobile robots

Fuzzy communication and cooperation of mobile robots

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International Workshop on Soft Computing Applications (SOFA)

作者： Laszlo T. Koczy Aron Ballagi Institute of Mechanical Electrical Engineering and Information Technology Széchenyi István University Gyor Hungary Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Széchenyi István University Hungary

Summary form only given. Intelligent cooperation of agents/entities in autonomous robotics is a new and very exiting research field. If one plans/implements a cooperating robot system with intelligent behavior, not all scenarios appearing in the "life of robots" can be programmed in advance and thus effective, fast and compact communication is one of the most important cornerstones of the high-end cooperating system. Communication itself is very expensive so, generally speaking, it is much more advisable to build up as big as possible contextual knowledge bases and codebooks in distant on-board robot controller computers in order to shorten the communication process if it essentially reduces the amount of information that must be transmitted from one to another, than to concentrate all contextual knowledge in one of them and then to export its respective parts whenever they are needed in the other(s). It seems to be very important in the cooperation and communication of intelligent robots or physical agents that the information exchange among them is as effective and compressed as possible. We propose a context dependent reconstructive or fuzzy communication system where the codebooks are built up by fuzzy signatures. Fuzzy signatures structure data into vectors of fuzzy values, each of which can be a further vector, have been introduced in order to handle complex structured data. This will widen the application of fuzzy theory to many areas where objects are complex and sometimes interdependent features are to be classified and thus similarities/dissimilarities are evaluated. Often, human experts can and must make decisions based on comparisons of cases with different numbers of data components, even with some missing components. Fuzzy signatures have been created with this objective in mind. This tree structure is a generalization of fuzzy sets and vector valued fuzzy sets in a way modeling the human approach to complex problems. However, when dealing with a very

关键词： Mobile communication Mobile robots Intelligent robots Context Fuzzy systems Humans Fuzzy sets Intelligent agent Intelligent systems Robot control

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