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International Conference on Autonomic Computing (ICAC)

作者： Jing Xu S. Adabala J.A.B. Fortes Advanced Computing and Information Systems Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

Grid environments enable users to share nondedicated resources that lack performance guarantees. This paper describes the design of application-centric middleware components to automatically recover from failures and dynamically adapt to grid environments with changing resource availabilities, improving fault-tolerance and performance. The key components of the application-centric approach are a global per-application execution history and an autonomic component that tracks the performance of a job on a grid resource against predictions based on the application execution history, to guide rescheduling decisions. Performance models of unmodified applications built using their execution history are used to predict failure as well as poor performance. A prototype of the proposed approach, an autonomic virtual application manager (AVAM), has been implemented in the context of the In-VIGO grid environment and its effectiveness has been evaluated for applications that generate CPU-intensive jobs with relatively short execution times (ranging from tens of seconds to less than an hour) on resources with highly variable loads - a workload generated by typical educational usage scenarios of In-VIGO-like grid environments. A memory-based learning algorithm is used to build the performance models for CPU-intensive applications that are used to predict the need for rescheduling. Results show that In-VIGO jobs managed by the AVAM consistently meet their execution deadlines under varying load conditions and gracefully recover from unexpected failures

关键词： Grid computing History Mesh generation Application software Fault tolerance Predictive models Quality of service Information systems Middleware Availability

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A Combinational Approach to the Fusion, De-noising and Enhancement of Dual-Energy X-Ray Luggage Images

A Combinational Approach to the Fusion, De-noising and Enhan...

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IEEE computer Society Conference on computer Vision and Pattern Recognition Workshops (CVPRW)

作者： Zhiyu Chen Yue Zheng B.R. Abidi D.L. Page M.A. Abidi Imaging Robotics and Intelligent Systems Laboratory Electrical and Computer Engineering Department University of Tennessee Knoxville TN USA

X-ray luggage inspection systems play an important role in ensuring air travelers’ security. However, the false alarm rate of commercial systems can be as high as 20% due to less than perfect image processing algorithms. In an effort to reduce the false alarm rate, this paper proposes a combinational scheme to fuse, de-noise and enhance dual-energy X-ray images for better object classification and threat detection. The fusion step is based on the wavelet transform. Fused images generally reveal more detail information; however, background noise often gets amplified during the fusion process. This paper applies a backgroundsubtraction- based noise reduction technique which is very efficient in removing background noise from fused X-ray images. The de-noised image is then processed using a new enhancement technique to reconstruct the final image. The final image not only contains complementary information from both source images, but is also background-noise-free and contrastenhanced, therefore easier to segment automatically or be interpreted by screeners, thus reducing the false alarm rate in X-ray luggage inspection.

关键词： Noise reduction X-ray imaging Inspection Background noise Security Image processing Fuses Object detection X-ray detection X-ray detectors

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Multi-agent Kalman consensus with relative uncertainty

Multi-agent Kalman consensus with relative uncertainty

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American Control Conference (ACC)

作者： Wei Ren R.W. Beard D.B. Kingston Space Systems Laboratory University of Maryland USA Department of Electrical and Computer Engineering Brigham Young University USA

In this paper, we propose discrete-time and continuous-time consensus update schemes motivated by the discrete-time and continuous-time Kalman filters. With certainty information encoded into each agent, the proposed consensus schemes explicitly account for relative confidence/reliability of information states from each agent in the team. We show mild sufficient conditions under which consensus can be achieved using the proposed consensus schemes in the presence of switching interaction topologies.

关键词： Kalman filters Uncertainty Communication system control Call conference Vehicles Sufficient conditions Global communication Network topology Environmental factors Wireless communication

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A Simple, Low-Cost and Low-Power Switch Architecture for NoCs

A Simple, Low-Cost and Low-Power Switch Architecture for NoC...

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International Conference on Microelectronics, ICM

作者： M. Nazm-Bojnordi M. Semsarzadeh A. Banaiyan A. Afzali-Kusha Low-Power High-Performance Nano-Systems Laboratory Electrical and Computer Engineering Department University of Tehran Iran

Considering the typically large use of NoCs as a solution to alleviate complexity of the current SoCs, designing an efficient NoC is an important key issue. This paper proposes a simple, low-cost and low-energy switch architecture for the NoCs using mesochronous clocking scheme for on-chip communication. Switches are designed in Verilog HDL. Experimental results show that the 4-ports instances of our proposed architecture are more efficient to be used as a basic element for constructing the NoCs.

关键词： Switches Network-on-a-chip Clocks Synchronization Communication switching Integrated circuit interconnections Network topology computer architecture Hardware design languages Timing

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Detection performance of time-hopping ultra-wideband LPI waveforms

Detection performance of time-hopping ultra-wideband LPI wav...

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IEEE Princeton Section Sarnoff Symposium

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)0780388542

Low probability of intercept (LPI) performance of a time-hopping (TH) ultra-wideband (UWB) system is investigated. The detection probability with the use of one single detector to detect the presence of TH UWB signals is derived. Another detection method, which uses multiple energy detectors, is also analyzed considering both chip and frame asynchronization and the time shift in the pulse position modulation (PPM). These two methods, one with single detector and the other with multiple detectors, are compared in terms of the detection probabilities

关键词： Ultra wideband technology Pulse modulation Detectors Amplitude modulation Performance analysis Spread spectrum communication Testing Chaos Frequency synchronization Space vector pulse width modulation

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Outage probability of wireless systems with linear and circular antenna arrays in correlated Nakagami fading channels

Outage probability of wireless systems with linear and circu...

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IEEE International Conference on Communications (ICC)

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)0780389387

In this paper, the performance of wireless communication systems with antenna arrays and multiple interferers in correlated Nakagami fading channels is investigated. Closed-form expressions of the probability density function (PDF) of signal-to-noise-plus-interference ratio (SNIR), taking account of fading correlations and mutual coupling, are derived and both maximal ratio combining (MRC) and optimal combining (OC) are considered in the derivation. The expressions for the outage probabilities are then derived. Since fading correlations and mutual coupling are closely related to array geometry, performance for both linear and circular arrays are analyzed and numerical results are shown to illustrate the effects of array geometry, angular spread, fading, and so on.

关键词： Linear antenna arrays Fading Mutual coupling Diversity reception Information geometry Wireless communication Antenna arrays Closed-form solution Probability density function Performance analysis

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Reverse link capacity of CDMA systems with imperfect beamforming using different types of antenna arrays

Reverse link capacity of CDMA systems with imperfect beamfor...

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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

The reverse link capacity of a direct-sequence code-division multiple-access (DS-CDMA) system in a multicell environment with both perfect and imperfect beamforming has been studied recently. In a practical implementation, the design of the antenna array may be constrained by the available space or the number of antennas. We investigate the maximum reverse link capacity of CDMA systems using different types of arrays, including linear, circular and rectangular arrays, with a fixed size. The CDMA capacity for different types of arrays with a fixed number of antennas is also examined. The capability of antenna arrays to combat the impairments of beamforming, such as arrival angle estimation errors and angular spreads, is closely related to their geometries. The impact of array geometry on system performance considering beamforming impairments is also examined and illustrated through numerical results.

关键词： Multiaccess communication Array signal processing Antenna arrays Linear antenna arrays Interference Receiving antennas Direction of arrival estimation Estimation error Geometry Fading

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Learning control: The state of the art and perspective

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Zidonghua Xuebao/Acta Automatica Sinica 2005年第6期31卷 943-955页

作者： Xu, Jian-Xin Hou, Zhong-Sheng Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 117576 Singapore Singapore Advanced Control Systems Laboratory School of Electronics and Information Engineering Beijing Jiaotong University Beijing 100044 China

The recent advances in learning control theory are reviewed. First insight is provided into the concept and principle associated with learning control under a repeatable control environment. Then a briefing is given to the two main streams of learning control-iterative learning control and repetitive control. Subsequently we survey several hot topics in the field of learning control. New trends in learning control using Lyapunov methods are also sketched, followed by remarks on future directions.

关键词： Learning systems

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Symbolic construction of dynamic mixed integer programs for power system management

Symbolic construction of dynamic mixed integer programs for ...

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2005 IEEE Power engineering Society General Meeting

作者： Kwatny, Harry G. Mensah, Edoe F. Niebur, Dagmar Teolis, Carole IEEE Center for Electric Power Engineering Drexel University Philadelphia PA 19104 United States Techno-Sciences Inc. Lanham MD 20706 Department of Mechanical Engineering and Mechanics Drexel University Philadelphia PA Drexel University's Electrical and Computer Engineering Department Jet Propulsion Laboratory University of Lausanne Systems Engineering at Techno-Sciences Inc.

ISBN: (纸本)078039156X

In this presentation, we discuss a symbolic tool, implemented in Mathematica©, that converts a hybrid automaton model of a power system into either a mixed logical dynamic system' (MLD) or a 'dynamic mixed integer program' (DMIP). The tool, converts any logical specification into mixed-integer formulas (IP formulas). For example the transition specification for the automaton is converted into a set of inequalities involving Boolean variables. The IP formulas can be used in decision computations using mixed integer programs or mixed integer dynamic programming. An example will be given involving controller design for a power conditioning system. ©2005 IEEE.

关键词： Electric power systems

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Design of a thin multi-aperture infrared imager

Design of a thin multi-aperture infrared imager

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Frontiers in Optics, FiO 2005

作者： Gibbons, Robert C. Gilstrap, Jeff A. Mait, Joseph N. Prather, Dennis W. Guo, Junpeng Brady, David J. Raytheon Company Network Centric Systems/Combat Systems 2501 West University Drive McKinney Texas 75071 United States US Army Research Laboratory AMSRD-ARL-SE-R 2800 Powder Mill Road Adelphi MD 20783-1197 United States Department of Electrical and Computer Engineering University of Delaware 140 Evans Hall Newark DE 19716 United States Electrical and Computer Engineering Department Duke University Durham North Carolina 27708 United States

We have designed a thin, multiplexed infrared imaging system that uses a diffractive element for generating shift-encoded images in each aperture. We present preliminary experimental results that demonstrate imager pe... 详细信息

ISBN: (纸本)1557527970

关键词： Electronics Infrared systems Point spread function Signal processing Diffractive optics (050.1970) Infrared imaging (110.3080) Multiple imaging (110.4190)

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