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Chinese control Conference (CCC)

作者： Yiguang Hong Zhong-ping Jiang Key Laboratory of Systems anc Control Chinese Academy and Sciences Beijing China Department of Electrical and Computer Engineering Polytechnic University Brooklyn NY USA

This paper addresses finite-time stabilization and identification problems for a class of uncertain systems with unknown parameters. New finite-time control laws are constructed with a design idea based on Lyapunov fu... 详细信息

关键词： Uncertain systems control systems Adaptive control Lyapunov method State feedback Programmable control Nonlinear control systems Nonlinear systems Uncertainty Parameter estimation

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Single Differential Modulation and Detection for MPSK in the Presence of Unknown Frequency Offset

Single Differential Modulation and Detection for MPSK in the...

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Asilomar Conference on Signals, systems & computers

作者： Jianhua Liu Petre Stoica Marvin Simon Jian Li Department of Electrical and Systems Engineering Embrey-Riddle Aeronautical University Daytona Beach FL USA Department of Systems and Control University of Uppsala Uppsala Sweden Jet Propulsion Laboratory Pasadena CA USA Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

We consider improving the performance of communications over unknown channels with unknown frequency offsets. In lieu of the commonly suggested double differential (DD) modulation/detection, we consider single differential (SD) modulation/detection. We propose an approach that first estimates and compensates for the frequency offset and then detects using an existing multiple symbol detector for SD modulation. We introduce a simple data-symbol-independent frequency offset estimation method, which is reasonably accurate when using a data block larger than the one used for detection. Simulation results show that the SD modulation/detection approach proposed herein can significantly outperform the DD modulation/detection schemes.

关键词： Frequency estimation Detectors Maximum likelihood detection Costs Degradation systems engineering and theory Communication system control control systems Propulsion Laboratories

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Sufficient excitation conditions for system identification using binary-valued observations

Sufficient excitation conditions for system identification u...

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American control Conference (ACC)

作者： Le Yi Wang G.G. Yin Yanlong Zhao Ji-Feng Zhang Department of Electrical and Computer Engineering Wayne State University Detroit MI USA Department of Mathematics Wayne State University Detroit MI USA Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy and Sciences China

Conditions on input signals are derived that characterize their probing richness for system identification using binary-valued observations. Identification configurations in open-loop, filtering, and feedback systems are discussed together with different scenarios of noises including actuator noise, input measurement noise, and output measurement noises. In addition to system parameter estimation, identifiability and sufficient excitation conditions are also derived under unknown threshold and noise distributions

关键词： System identification Noise measurement Sensor systems Parameter estimation Sensor phenomena and characterization Distribution functions Mathematics Filtering Output feedback Actuators

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Generating multi-scroll chaotic attractors via threshold control

Generating multi-scroll chaotic attractors via threshold con...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Jinhu Lu K. Murali S. Sinha H. Leung Key Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and Systems Science슠Chinese Academy of Sciences Beijing China Department of Physics Anna University Chennai India Institute for Mathematical Sciences Chennai India Department of Electrical and Computer Engineering University of Calgary Calgary Canada

This paper proposes a novel threshold control approach for creating multi-scroll chaotic attractors. The general jerk circuit is used as an example to show the working principle of this method. The controlled jerk circuit can emerge various limit cycles and n-scroll chaotic attractors by adjusting the upper threshold, lower threshold, and the width of inner saturated plateau. The dynamical mechanism of the threshold control is then further explored by analyzing the system dynamical behaviors. In particular, this method is effective and simple to implement since we only need monitor a single state variable and reset it if it exceeds the thresholds. It indicates the potential engineering applications for various chaos-based information systems

关键词： Chaos control systems Circuits Limit-cycles Optimal control Linear feedback control systems Hysteresis Laboratories Physics computing systems engineering and theory

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Sparsity-Driven Sparse-Aperture Ultrasound Imaging

Sparsity-Driven Sparse-Aperture Ultrasound Imaging

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： M. Cetin E. Bossy R. Cleveland W.C. Karl Laboratory for Information and Decision Systems MIT Cambridge MA USA Faculty of Engineering and Natural Sciences Sabancı University İstanbul Turkey Department of Aerospace and Mechanical Engineering Boston University Boston MA USA ESPCI/CNRS - UPR 5 Laboratoire d'Optique Physique Paris France Department of Electrical and Computer Engineering Boston University Boston MA USA

We propose an image formation algorithm for ultrasound imaging based on sparsity-driven regularization functionals. We consider data collected by synthetic transducer arrays, with the primary motivating application being nondestructive evaluation. Our framework involves the use of a physical optics-based forward model of the observation process; the formulation of an optimization problem for image formation; and the solution of that problem through efficient numerical algorithms. Our sparsity-driven, model-based approach achieves the preservation of physical features while suppressing spurious artifacts. It also provides robust reconstructions in the case of sparse observation apertures. We demonstrate the effectiveness of our imaging strategy on real ultrasound data

关键词： Ultrasonic imaging Optical imaging Apertures Optical scattering Image reconstruction Ultrasonic transducers Optical sensors Acoustic transducers Image resolution Reflectivity

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Significance of Pacemaker vs. Non-Pacemaker Neurons in an Excitatory Rhythmic Network

Significance of Pacemaker vs. Non-Pacemaker Neurons in an Ex...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Liston K. Purvis Terrence M. Wright Jeffrey C. Smith Robert J. Butera Laboratory for Neuroengineering Georgia Institute of Technology Atlanta GA USA Department of Biology Emory University Atlanta GA USA Cellular and Systems Neurobiology Section Laboratory of Neural Control NINDS-National Institutes of Health Bethesda MD USA Laboratory for Neuroengineering and School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

This modeling study investigates the functional role of pacemaker neurons in generating stable rhythms in the pre-Botzinger complex, a subcircuit of the respiratory pattern-generating circuitry in mammals. While the presence of pacemakers within the network is without doubt, the percentage and significance of such pacemakers is still unresolved. Here we revisited earlier network simulations by varying the fraction of pacemaker and non-pacemaker neurons within the network, and quantifying the robustness of the input parameter space and range of frequencies output by the network. Stable network rhythms were possible even with no pacemakers. However, we found that a network of at least 50% pacemakers produced the greatest range of output frequencies and had the more robust input space

关键词： Pacemakers Neurons Frequency Rhythm Robustness Circuits Laboratories Neural engineering Cities and towns USA Councils

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Guest Editorial - Optical communications and networking series

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2005年第8期23卷 1441-1443页

作者： Chan, VWS Department of Electrical Engineering and Computer Science and Aeronautics and Astronautics United States Laboratory for Information and Decision Systems (LIDS) MIT United States

Why is the optical network to date not as successful commercially as many previously thought it would be and what can the research community do to help? The author offers his opinion on this question. When one gives the first part of this question some thought, several possibilities naturally come to mind: has the cause been substandard optical network performance? Have venture capitalists and entrepreneurs killed the market with glut by miscalculating and overbuilding the core? In my view, both contributed to the problem, but mostly, it is that optical networks have been engineered with insufficient attention given to the cost incurred by the end-user.

关键词： Optical fiber networks Costs Wavelength division multiplexing Optical packet switching Logic gates Optical fiber communication Reliability engineering computer network reliability Home computing HDTV

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Network coding in wireless networks

Network coding in wireless networks

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2005 IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2005

作者： Medard, Muriel MIT Department of Electrical Engineering and Computer Science MIT Laboratory for Information and Decision Systems Simmons Hall

The advent of network coding has blurred the line between compression and routing in networks. In this talk, we overview the main principles of network coding and discuss the applicability of network coding to wireless network settings. In particular, we argue that the ablity to construct both network codes and minimum-cost subgraphs in a completely distributed fashion may provide considerable improvements, in performance and in ease of network management, over current routing-based approaches.

关键词： Wireless telecommunication systems

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Optical satellite networks

Optical satellite networks

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Optical Fiber Communication Conference, OFC 2005

作者： Chan, Vincent W.S. IEEE Laboratory for Information and Decision Systems Department of Electrical Engineering and Computer Science Department of Aeronautics and Astronautics MIT United States

With high-speed space optical crosslinks, an optical satellite network as part of a larger integrated space-terrestrial network is now feasible. This radical technology building block can have profound transforming ef... 详细信息

ISBN: (纸本)1557527849

关键词： Fiber optics

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Inference with minimal communication: A decision-theoretic variational approach

Inference with minimal communication: A decision-theoretic v...

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2005 Annual Conference on Neural Information Processing systems, NIPS 2005

作者： Kreidl, O. Patrick Willsky, Alan S. Department of Electrical Engineering and Computer Science MIT Laboratory for Information and Decision Systems Cambridge MA 02139 United States

ISBN: (纸本)9780262232531

Given a directed graphical model with binary-valued hidden nodes and real-valued noisy observations, consider deciding upon the maximum a-posteriori (MAP) or the maximum posterior-marginal (MPM) assignment under the restriction that each node broadcasts only to its children exactly one single-bit message. We present a variational formulation, viewing the processing rules local to all nodes as degrees-of-freedom, that minimizes the loss in expected (MAP or MPM) performance subject to such online communication constraints. The approach leads to a novel message-passing algorithm to be executed offline, or before observations are realized, which mitigates the performance loss by iteratively coupling all rules in a manner implicitly driven by global statistics. We also provide (i) illustrative examples, (ii) assumptions that guarantee convergence and efficiency and (iii) connections to active research areas.

关键词： Iterative methods

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