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IEEE Conference on Wireless Communications and Networking

作者： A. Mahmoodian G. Haring Institute for Computer Science and Business Informatics Department for Advanced Computer Engineering University of Technology Vienna Vienna Austria

ISBN: (纸本)0780365968

We propose and analyze an extension of the concept of RSVP to guarantee the service quality of mobile Internet-based applications. Our Mobile RSVP protocol provides an advanced resource reservation mechanism in a wireless cellular environment. Furthermore, we propose the dynamic resource sharing algorithm to make better use of network resources in those cells, where advance reservation takes place. We analyze our proposed protocol and the corresponding dynamic resource sharing algorithm by simulating the behavior of distinct call types in a single cell. We also investigate the effect of user mobility behavior on the performance of future resource reservation protocols with mobility support. By analyzing the pattern of user mobility as well as possible application priorities, we hope to be able to put constraints to the scope of service provision.

关键词： Resource management Protocols Quality of service Mobile communication Heuristic algorithms Land mobile radio cellular systems computer science informatics Mobile computing Web and internet services

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Modified Booth 1's complement and modulo 2/sup n/-1 multipliers

Modified Booth 1's complement and modulo 2/sup n/-1 multipli...

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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： C. Efstathiou H.T. Vergos Department of Informatics TEI Athens Athens Greece Computer Technology Institute Patras Greece Computer Engineering & Informatics Department University of Patras Patras Greece

ISBN: (纸本)0780365429

In this paper we derive a novel modified Booth multiplier architecture which is based on 1's complement arithmetic. We also extend our theory to the design of module 2/sup n/-1 multipliers. The proposed 1's complement modified Booth multipliers have an execution latency which is approximately the same as that offered by their 2's complement counterparts with a completely regular structure. Therefore, pipelined implementations of them can be derived in a straightforward manner. The proposed modified Booth module 2/sup n/-1 multipliers can find great applicability in Residue Number System (RNS) applications.

关键词： Delay Adders Pipeline processing informatics Digital arithmetic Counting circuits computer architecture Very large scale integration Integrated circuit technology Throughput

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An efficient algorithm for finding high order modes in resonators with cylindrical symmetry

An efficient algorithm for finding high order modes in reson...

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2000 30th European Microwave Conference, EuMC 2000

作者： Rewieński, Michal Mrozowski, Michal Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 United States Faculty of Electronics Telecommunications and Informatics Technical University of Gdańsk 80-952 Gdańsk Poland

This paper presents a highly efficient numerical approach for modeling electromagnetically large resonators with cylindrical symmetry, based on the algorithm proposed in [4], using preconditioned Arnoldi technique and FDFD method. It applies new techniques to overcome the two main difficulties of the former approach: the errors due to numerical dispersion and long solution time. The first problem is solved by proposing a new low-cost procedure for correcting the FD operators. The second - by applying a novel efficient parallelization scheme. The paper presents numerical results validating the correction procedure and showing very good performance of the solver in parallel systems. © 2000 IEEE.

关键词： Resonators

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Polyvalent parallelizations for hierarchical block matching motion estimation

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Journal of Computing and Information technology 2000年第1期8卷 41-69页

作者： Konstantopoulos, Charalampos Svolos, Andreas Kaklamanis, Christos Computer Engineering and Informatics Department University of Patras Computer Technology Institute 11 Aktaiou and Poulopoulou Str. Thiseio AthensGR-118 51 Greece

Block matching motion estimation algorithms are widely used in video coding schemes. In this paper,we design an efficient hierarchical block matching motion estimation (HBMME) algorithm on a hypercube multiprocessor. Unlike systolic array designs, this solution is not tied down to specific values of algorithm parameters and thus offers increased flexibility. Moreover, the hypercube network can efficiently handle the non regular data flow of the HBMME algorithm. Our techniques nearly eliminate the occurrence of "difficult" communication patterns, namely many-to-many personalized communication, by replacing them with simple shift operations. These operations have an efficient implementation on most of interconnection networks and thus our techniques can be adapted to other networks as well. With regard to the employed multiprocessor we make no specific assumption about the amount of local memory residing in each processor. Instead, we introduce a free parameter S and assume that each processor has Θ(S) local memory. By doing so, we handle all the cases of modern multiprocessors, that is fine-grained, medium-grained and coarse-grained multiprocessors and thus our design is quite general.

关键词： Motion estimation

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Development of reusable serial FIR filters with reprogrammable coefficients designed for serial dataflow architectures

Development of reusable serial FIR filters with reprogrammab...

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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： K. Adaos G. Alexiou N. Kanopoulos Department of Computer Engineering and Informatics University of Patras Patras Greece Computer Technology Institute Patras Greece Atmel Multimedia and Communications Morrisville NC USA

ISBN: (纸本)0780365429

This paper presents the development of a family of bit-serial FIR filters with dynamically reprogrammable coefficients. The filters are described in standard VHDL, automatically produced by a parameterized software tool. Reusability was verified by synthesizing the HDL code for different ASIC and FPGA platforms. Efficiency was measured by implementation and accurate timing simulation in ALTEra FPGAs. The proposed filters are designed for use in serial data-flow computation.

关键词： Finite impulse response filter Field programmable gate arrays Prototypes Hardware design languages Application specific integrated circuits Guidelines Emulation computer architecture Data engineering Design engineering

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Design of a robust adaptive controller for a mobile robot

Design of a robust adaptive controller for a mobile robot

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Proceedings. 2000 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2000) (Cat. No.00CH37113)

作者： M.S. Kim J.H. Shin J.J. Lee Department of Computer Science and Electrical Engineering Korea Advanced Institute of Science and Technology Daejeon South Korea Department of Mechano-Informatics University of Tokyo Bunkyo Tokyo Japan

In the design of a controller for mobile robot, there are only few results on the problem of integrating the nonholonomic kinematic controller and the dynamic controller for mobile robots. Also there are only few literatures on the robustness of the controller in the presence of uncertainties or external disturbances in the dynamical model of mobile robot. In this paper, a robust adaptive controller which can achieve velocity tracking while considering not only kinematic model but also dynamic model of mobile robot is proposed. The proposed controller can overcome model uncertainty or external disturbances by the robust adaptive technique. The stability of the dynamic system is shown through the Lyapunov method.

关键词： Robust control Programmable control Adaptive control Mobile robots Robot control Kinematics Uncertainty Velocity control Stability Lyapunov method

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Experimental verification for robust adaptive control of an underactuated robot manipulator with second-order nonholonomic constraints

Experimental verification for robust adaptive control of an ...

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IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： J.-H. Shin Ju-Jang Lee Department of Mechano-Informatics Graduate School of Engineering University of Tokyo Bunkyo Tokyo Japan Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

This paper presents a robust adaptive control scheme of an underactuated manipulator. The proposed control schemes are a joint position-to-position (PTP) control scheme and a Cartesian end-point control scheme tracking a continuous path in Cartesian space. The proposed joint and Cartesian controllers are verified by experimental results for an actual three-link SCAra robot manipulator with a passive joint. In this robot experiment, the third joint of this robot is passive.

关键词： Robust control Adaptive control Robots Manipulator dynamics Orbital robotics Equations Space technology Uncertainty Friction Jacobian matrices

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An Efficient Algorithm for Finding High Order Modes in Resonators with Cylindrical Symmetry

An Efficient Algorithm for Finding High Order Modes in Reson...

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European Conference on Microwave

作者： Michal Rewienski Michal Mrozowski Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology 02139 Cambridge MA USA Faculty of Electronics Telecommunications and Informatics Technical University of Gdańsk GdaDsk Poland

关键词： Mirrors Eigenvalues and eigenfunctions Matrix decomposition Matrix converters Sparse matrices informatics Shape measurement Millimeter wave measurements Finite difference methods Time domain analysis

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Error-correcting codes over an alphabet of four elements

Error-correcting codes over an alphabet of four elements

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IEEE International Symposium on Information Theory

作者： G.T. Bogdanova A.E. Brouwer S.N. Kapralov P.R.J. Ostergard Institute of Mathematics and Informatics Bulgarian Academy of Sciences Veliko Tarnovo Bulgaria Department of Mathematics Eindhovan University of Technology Eindhoven Netherlands Department of Mathematics Technical University Gabrovo Bulgaria Department of Computer Science and Engineering Helsinki University of Technology Finland

The problem of finding the values of A/sub q/(n,d)-the maximum size of a code of length n and minimum distance d over an alphabet of q elements-is considered. When q/spl les/M<2q, all parameters for which A/sub q/(... 详细信息

关键词： Error correction codes Mathematics Upper bound Stochastic processes Orbits Linear code Vectors Conferences

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A novel rigid object segmentation method based on multiresolution 3-D motion and luminance analysis

A novel rigid object segmentation method based on multiresol...

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IEEE International Conference on Image Processing

作者： T. Papadimitriou K.I. Diamantaras M.G. Strintzis M. Roumeliotis Educational Technology Laboratory University of Macedonia Thessaloniki Greece Department of Informatics Technological Educational Institute of Thessaloniki Sindos Greece Information Processing Laboratory Department Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece Department Applied Informatics University of Macedonia Thessaloniki Greece

ISBN: (纸本)0780362977

We present a new image sequence segmentation method which combines both spatial and temporal information in a multiresolution framework. A region growing technique in a multiresolution scheme outputs an over-segmented partition of the image scene. Pure temporal information is collected for each region using a feature extraction/feature tracking technique. Motion information is further processed in a pyramidal robust motion estimation scheme, in order to calculate more complex motion parameters for each region. Regions obtained from the first step are clustered according to their motion models. This ensures that rigid objects with luminance discontinuities can be segmented correctly. The method has been successfully tested in real imagery and typical examples are presented.

关键词： Object segmentation Spatial resolution Image segmentation Image resolution Feature extraction Image sequences Layout Robustness Motion estimation Testing

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