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检索条件"机构=Computer Vision and Systems Laboratory Department of Electrical and Computer Engineering"

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Facial expression classification based on MPEG-4 FAPs: the use of evidence and prior knowledge for uncertainty removal

Facial expression classification based on MPEG-4 FAPs: the u...

引用

IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： M. Wallace A. Raouzaiou N. Tsapatsoulis S. Kollias Image Video and Multimedia Systems Laboratory (IVML) Department of Computer Science School of Electrical and Computer Engineering National and Technical University of Athens Zografou Greece

As low resolution shots, rotations of the head with respect to the camera, face deformation due to speech and so on inflict a great deal of uncertainty in FAP measurements, uncertainty is also inherent in the process of expression analysis. We tackle such uncertainty via the observation that user emotions do not typically alter rapidly very often. Thus, possibilistic evidence may be gathered from each frame about the user expression; evidence from the current and recent frames can be combined using evidence theory.

关键词： MPEG 4 Standard Financial advantage program Uncertainty Head Cameras Videoconference Online Communities/Technical Collaboration Vocabulary Mouth Atomic measurements

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FPGA emulation of quantum circuits

FPGA emulation of quantum circuits

引用

IEEE International Conference on computer Design: VLSI in computers and Processors, (ICCD)

作者： A.U. Khalid Z. Zilic K. Radecka Microelectronics and Computer Systems Laboratory McGiN University RRP Montreal QUE Canada Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

Quantum computing offers immense speedup in performing tasks such as data encryption and searching. The quantum algorithms can be modeled using classical computing devices, however classical computer simulations cannot deal efficiently with the parallelism present in quantum algorithms. The quantum circuit model for quantum algorithms is sufficient to describe the known quantum algorithms. Using analogies between quantum and digital circuits, we design the emulator of quantum algorithms in FPGAs that allows efficient experimentation with new quantum algorithms. This paper concentrates on new techniques for modeling quantum circuits, including the entanglement and probabilistic computing realization, as well as the critical issues in the required precision of computing.

关键词： Field programmable gate arrays Emulation Quantum computing Cryptography Concurrent computing computer simulation Parallel processing Digital circuits Algorithm design and analysis Quantum entanglement

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Error probabilities of CDMA systems with beamforming under different power control schemes

Error probabilities of CDMA systems with beamforming under d...

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IEEE Conference on Vehicular Technology (VTC)

作者： Jin Yu Yu-Dong Yao Department of Electrical and Computer Engineering Wireless Information Systems Engineering Laboratory (WISELAB) Stevens Institute of Technology Hoboken NJ USA

ISBN: (纸本)0780385217

The reverse link error probability of multicell direct-sequence code-division multiple-access (DS-CDMA) systems with beamforming and Rake receivers is evaluated in this paper. The impact of power control schemes on the error probability is examined, considering power-based power control (PW-PC) and signal-to-interference ratio (SIR) based power control (SIR-PC). Expressions for the error probability as a function of the number of users per cell, the number of antenna elements, the number of Rake receiver fingers, and the CDMA processing gain are derived and both multipath interference and interference due to other users (own and other cells) are taken into consideration in the evaluation. Numeric results indicate that CDMA systems with different power control schemes have the same reverse link user capacity for a given target bit-error rate. However, the SIR-PC approach consumes less power than PW-PC when the number of users is smaller than the user capacity.

关键词： Error probability Multiaccess communication Array signal processing Power control Fading Multipath channels Interference Receiving antennas Fingers Bit error rate

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Evaluation of reverse link performance of a CDMA system with imperfect beamforming

Evaluation of reverse link performance of a CDMA system with...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Jin Yu Yu-Dong Yao Wireless Information Systems Engineering Laboratory (WISELAB) Department of Electrical and Computer Engineering Stevens Institute of Technology Hoboken NJ USA

ISBN: (纸本)0780382552

Reverse link capacity of a direct-sequence code-division multiple-access (DS-CDMA) system in a multicell environment has been studied recently and significant capacity improvement due to the use of beamforming has been observed. However, system performance with beamforming is affected by several impairments, such as direction of arrival (DOA) estimation errors, array perturbations and mutual coupling. The reverse link performance of CDMA systems with beamforming under these impairments (imperfect beamforming) is investigated. A simplified beamforming model is developed to evaluate the system performance in terms of user capacity and outage probabilities. Both signal-to-interference ratio (SIR) based power control and strength-based power control are considered. The capacity degradation due to different impairments is shown and outage probabilities under different power control schemes are compared.

关键词： Multiaccess communication Array signal processing Power control System performance Capacity planning Direction of arrival estimation Estimation error Mutual coupling Power system modeling Degradation

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Utilizing beamforming for random access - a cross-layer paradigm

Utilizing beamforming for random access - a cross-layer para...

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IEEE Conference on Vehicular Technology (VTC)

作者： Yu-Dong Yao M. Syed Jin Yu Wireless Information Systems Engineering Laboratory (WISELAB) Department of Electrical & Computer Engineering Stevens Institute of Technology Hoboken NJ USA

Adaptive beamforming has been shown to substantially improve the performance of a slotted Aloha packet radio system. In this paper we present a slotted Aloha based random access protocol designed to be employed in conjunction with adaptive beamforming, for use in a sectorized wireless system. The focus is on a cross-layer design approach, in which information about the status of packet transmissions is utilized to dynamically adapt antenna beams among the sectors in a cell. This scheme is especially robust against the network inefficiencies due to uneven and time-varying traffic load densities within the sectors of a cell. Simulation results demonstrate the substantial enhancement in throughput and delay performance due to the proposed scheme.

关键词： Array signal processing Packet radio networks Access protocols Cross layer design Adaptive arrays Transmitting antennas Robustness Telecommunication traffic Throughput Delay

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Toward multimodal human-robot cooperation and collaboration

Toward multimodal human-robot cooperation and collaboration

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Collection of Technical Papers - AIAA 1st Intelligent systems Technical Conference

作者： Perzanowski, Dennis Brock, Derek Bugajska, Magdalena Thomas, Scott Sofge, Donald Adams, William Skubic, Marjorie Blisard, Sam Cassimatis, Nicholas Trafton, J. Gregory Schultz, Alan C. Naval Research Laboratory Washington DC 20375 University of Missouri Columbia MO 65211 Rensselaer Polytechnic Institute Troy NY 12180 Intelligent Multimodal/Multimedia Systems Code 5512 Interface Design and Evaluation Code 5513 Intelligent Systems Code 5515 Electrical and Computer Engineering Department Department of Cognitive Science

ISBN: (纸本)156347719X

Our multimodal interface integrates speech recognition, natural language understanding, spatial reasoning and human cognitive models for completing specific tasks and for perspective-taking in locative oriented tasks. With natural language and gestures, we believe human-robot interaction and communication is facilitated. Instead of concentrating on the various modalities of the interface, users can concentrate on the task at hand. Likewise, by incorporating human cognitive models for handling spatial information and perspective-taking, as well as for specific task completion, a better match with the expectations that humans acquire from their human-human interactions should be obtained, further facilitating cooperation and collaboration in human-robot interactions.

关键词： Speech recognition

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A hybrid automaton model of the motor control system

A hybrid automaton model of the motor control system

引用

International Symposium on Communications Control and Signal Processing (ISCCSP)

作者： M. Dahleh S. Massaquoi Laboratory for Information and Decision Systems Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA

Summary form only given. In this paper, we provide a comprehensive model of the motor control system which consists of three major components: the motor cortex which is responsible for strategic decisions, i.e., constructing the precise trajectory to be followed, the basal ganglia which is responsible for exciting the correct neuronal assemblies, and finally, the cerebellum which is responsible for tactical decisions. It is shown how a robust-hybrid automaton constructed from learned primitives can provide a comprehensive model of the motor control system. In the paper, we discuss how this model explains interesting biological behaviors.

关键词： Motor drives Brain modeling Biological system modeling Automatic control Control systems Laboratories Assembly systems Robust control Learning automata

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Double-constrained optimization of optical component selection problem using genetic elitism and double string coding

Double-constrained optimization of optical component selecti...

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International Conference on Numerical Simulation of Optoelectronic Devices, (NUSOD)

作者： M.A. Dallaali M. Premaratne Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

The genetic elitism and double string coding were used to solve the optical component problem. For the first time, two constraints were applied where both were combined together using a merging function. The results s... 详细信息

关键词： Optical devices Attenuation Constraint optimization Cost function Genetic mutations Computational modeling computer simulation Laboratories Genetic engineering systems engineering and theory

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Nonlinear analyses of interactive power-electronics networks: illustrations

Nonlinear analyses of interactive power-electronics networks...

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International Congress Power Electronics (CIEP)

作者： S.K. Mazumder Department of Electrical and Computer Engineering Director Laboratory for Energy and Switching-Electronics Systems University of Illinois Chicago IL USA

The applications of interactive power-electronics networks (IPNs) are on the rise. The successful operation of multimodule IPNs relies heavily on a stable design. In this paper, we illustrate the stability of three classes of DC-DC power-electronics systems, which are some of the building blocks of an IPN, The primary focus of the paper is to illustrate the differences between the new and existing approaches and mechanisms for stability analysis of power-electronics systems using some interesting results.

关键词： Switches Switching converters Buck converters Voltage Bifurcation Stability criteria Filters Frequency Telecommunications Power supplies

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Integrating region and edge information for the automatic segmentation of interventional magnetic resonance images of the shoulder complex

Integrating region and edge information for the automatic se...

引用

Canadian Conference on computer and Robot vision, CRV

作者： M.-E. Tremblay A. Branzan Albu L. Hebert D. Laurendeau Computer Vision and Systems Laboratory Department of Electrical Engineering Laval University QUE Canada National Defence of Canada Health Services Delivery CS Valcartier succ FORCES Courcelette QUE Canada

This paper proposes a new 2D segmentation method for MR shoulder images. Due to the significant length of the image sequences, we aim at minimizing the user intervention in the segmentation process. Our method integrates region and edge information in a coherent manner. In fact, the edge information is used in the definition of an adaptive similarity measure for iterative pixel aggregation. The seeds for the region growing process are defined automatically, which is essential for processing long image sequences with variable average brightness. Moreover, the proposed segmentation approach implements parallel region growing processes, and allows for dynamic region merging at successive iterations. To assess the performance of the proposed approach, we followed a standard methodology used for validating 2D segmentation, as well as a quantitative and qualitative evaluation of the 3D shoulder model reconstructed from the segmented image sequences.

关键词： Image segmentation Magnetic resonance Shoulder Image sequences Image reconstruction computer vision Brightness Pathology Biomedical imaging Laboratories

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