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Piecewise-linear modeling of analog circuits using trained feed-forward neural networks and adaptive clustering of hidden neurons

Piecewise-linear modeling of analog circuits using trained f...

引用

International Joint Conference on Neural Networks (IJCNN)

作者： S. Doboli G. Gothoskar A. Doboli Computer Science Department Hofstra University Hempstead NY USA VLSI Systems Design Laboratory Electrical and Computer Engineering Department SUNY Stony Brook Stony Brook NY USA

This paper presents a new technique for automatically creating analog circuit models. The method extracts piecewise linear models from trained neural networks. A model is a set of linear dependencies between circuit performances and design parameters. The paper illustrates the technique for an OTA circuit - an amplifier circuit widely used in filters and A/D converters for which models for gain and bandwidth were automatically generated. As experiments show, the obtained models have simple form that accurately fits the sampled points and the behavior of the trained neural networks. These models are useful for fast simulation of systems with non-linear behavior and performances.

关键词： Piecewise linear techniques Analog circuits Feedforward systems Neural networks Feedforward neural networks Adaptive systems Neurons Filters Bandwidth Circuit simulation

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Panel discussion whitherto robust control 4

Panel discussion whitherto robust control

引用

4th IFAC Symposium on Robust Control Design, ROCOND 2003

作者： Tempo, Roberto Basar, Tamer Khargonekar, Pramod P. Kokotovic, Petar V. Scherer, Carsten W. IEIIT-CNR Politecnico di Torino Italy Coordinated Science Laboratory University of Illinois Urbana-Champaign United States College of Engineering University of Florida Gainesville United States Department of Electrical and Computer Engineering University of California Santa Barbara United States Mechanical Engineering Systems and Control Group Delft University of Technology Netherlands

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Textual message read by a mobile robot

Textual message read by a mobile robot

引用

IEEE International Workshop on Intelligent Robots and systems (IROS)

作者： D. Letourneau F. Michaud J.-M. Valin C. Proulx Department of Electrical Engineering and Computer Engineering Universite de Sherbrooke LABORIUS - Research Laboratory on Mobile Robotics and Intelligent Systems Sherbrooke Quebec CANADA

Giving the ability to read characters and symbols is highly desirable for increased autonomy of mobile robots operating in the real world. The idea is fairly simple: give a robot the ability to acquire an image of a message to read, extract the symbols and recognize them. Image character recognition research has been going on for decades now, with good results. But compared to conventional character recognition systems, the challenge with a mobile robot is to find a textual message to capture in the world and to get a good view of the message, knowing that the viewpoint of the robot depends on its position in relation to the message, which cannot be pre-specified. In this paper we present our approach making it possible for an autonomous mobile robot to read messages. We outline the constraints under which the approach works, and present results obtained using a Pioneer 2 robot equipped with a Pentium 233 MHz and a pan-tilt-zoom camera.

关键词： Mobile robots Robot vision systems Cameras Intelligent robots Character recognition Image recognition Navigation Laboratories Mobile computing Intelligent systems

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Control of the nanopositioning devices

Control of the nanopositioning devices

引用

IEEE Conference on Decision and Control

作者： S. Salapaka A. Sebastian Laboratory for Information and Decision Systems MIT MA USA Department of Electrical and Computer Engineering Iowa State University Ames IA USA

We present a paradigm which prescribes a procedure for a systematic design, analysis and development of nanopositioning devices. In this effort, we have used many tools from modern control theory to model devices, to quantify device resolution, bandwidth, range, and robustness, and to tackle undesirable nonlinear effects such as hysteresis and creep. The implementation of this procedure for the simultaneous achievement of robustness, high precision, and high bandwidth objectives is presented. Emphasis is placed on the robustness aspects that make the nanopositioner operable in diverse need for tuning that is present paradigm are demonstrated operating conditions thus alleviating the need for tuning that is present in existing designs. The merits of the through experimental results.

关键词： Nanopositioning Bandwidth Optical microscopy Robustness Magnetic hysteresis Atom optics Semiconductor device testing System testing Optical recording Biological materials

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Dynamic scheduling issues in SMT architectures

Dynamic scheduling issues in SMT architectures

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International Symposium on parallel and Distributed Processing (IPDPS)

作者： Chulho Shin Seong-Won Lee J.-L. Gaudiot Samsung Electronics Corporation System Design Technology Laboratory Department of Electrical Engineering-Systems University of Southern California USA Department of Electrical Engineering and Computer Science University of California Irvine USA

Simultaneous multithreading (SMT) attempts to attain higher processor utilization by allowing instructions from multiple independent threads to coexist in a processor and compete for shared resources. Previous studies have shown, however, that its throughput may be limited by the number of threads. A reason is that a fixed thread scheduling policy cannot be optimal for the varying mixes of threads it may face in an SMT processor. Our adaptive dynamic thread scheduling (ADTS) was previously proposed to achieve higher utilization by allowing a detector thread to make use of wasted pipeline slots with nominal hardware and software costs. The detector thread adaptively switches between various fetch policies. Our previous study showed that a single fixed thread scheduling policy presents much room (some 30%) for improvement compared to an oracle-scheduled case. In this paper, we take a closer look at ADTS. We implemented the functional model of the ADTS and its software architecture to evaluate various heuristics for determining a better fetch policy for a next scheduling quantum. We report that performance could be improved by as much as 25%.

关键词： Dynamic scheduling Surface-mount technology Yarn Processor scheduling Detectors Multithreading Throughput Face detection Adaptive scheduling Pipelines

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On the grid and sensor networks 03

On the grid and sensor networks

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International Workshop on Grid Computing

作者： V. Hingne A. Joshi E. Houstis J. Michopoulos Department of Computer Science and Electrical Engineering University of Maryland Baltimore County USA Department of Computer Sciences & Purdue University and University of Thessaly Greece Computational Multiphysics Systems Laboratory Naval Research Laboratory Inc. USA

ISBN: (纸本)9780769520261

The pervasive computing environment and the wired grid infrastructure can be combined to make the information grid truly pervasive. Interesting applications can be built by utilizing the computational abilities of the grid to answer queries on sensor data. We identify some of the research issues and challenges in building an infrastructure to support such applications. We present the design and preliminary implementation of the proposed infrastructure, identify the tradeoffs relating to sensor accuracy consumption, and report experimental results from a sample scenario involving firefighting.

关键词： Grid computing Sensor phenomena and characterization Temperature sensors Pervasive computing Aggregates computer networks Fires Sensor systems computer science Application software

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Non-coherent estimator-correlators for unresolved multipath Ricean channels

Non-coherent estimator-correlators for unresolved multipath ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： F. Danilo-Lemoine H. Leib Department of Syst. and Computer Engineering Broadband Communications & Wireless Systems Centre Carleton University Ottawa ONT Canada Department of Electrical and Computer Engineering McGill University Telecommunications and Signal Processing Laboratory Montreal QUE Canada

This paper considers detection techniques for unresolved Ricean/Rayleigh fading multipath channels. It is well known that the optimal receiver has an estimator-correlator form, with a minimum mean-square error (MMSE) estimate. With known multipath delays and unknown specular phases, the Ricean non-coherent multipath channel is a case where the received noiseless signal process is non-Gaussian, and the MMSE estimator is non-linear in the observation. This work presents novel, explicit expressions for such a MMSE estimator. It is shown that the MMSE estimate has the same multipath format as the noiseless received signal, with the unknown parameters replaced by corresponding estimates. The MMSE estimator scales down contributions from specular multipath components with poor phase estimates, reducing their effect on the detection process. The estimator includes a multipath decorrelation operation which is essential to avoid error floors over unresolved multipath channels. Based on matched filter bounds, it is shown that little degradation gains are obtained by employing suboptimal linear estimator-correlators, provided that they include the decorrelation operation.

关键词： Multipath channels Phase estimation Delay estimation Decorrelation Rayleigh channels Phase noise Signal processing Phase detection Matched filters Degradation

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H/sub /spl infin// loop shaping design for nano-positioning

H/sub /spl infin// loop shaping design for nano-positioning

引用

American Control Conference (ACC)

作者： A. Sebastian S. Salapaka Department of Electrical and Computer Engineering Iowa State University Ames IA USA Laboratory of Information and Decision Systems Institute of Technology MA USA

This article presents the identification and control of a nano-positioning device. The device consists of two stages, which enable two-dimensional positioning. Each stage is actuated by piezo-electric stacks and its motion is sensed by a linear variable differential transformer (LVDT). A 2 /spl times/ 2 transfer function has been identified to describe the device. In this paper the main limitations to nano-positioning have been overcome through control. Feedback laws have been designed to address the undesirable effects of hysteresis and creep, which are significant in the open loop implementation, and to meet the steady state tracking and bandwidth requirements of nano-positioning. Great emphasis has been placed on robustness, which leads to a system that can withstand the diverse conditions where it will be used and does not necessitate tuning, as is the case with the existing designs. Accordingly, Glover-McFarlane H/sub /spl infin// loop shaping controllers have been employed to robustify existing non-model based designs. The merits of these designs along with the experimental results obtained by using them have been presented.

关键词： Nanopositioning Transfer functions Open loop systems Feedback loop State feedback Hysteresis Creep Steady-state Tracking loops Bandwidth

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An fpga based rf link for power and full duplex data transfer

An fpga based rf link for power and full duplex data transfe...

引用

IEEE Instrumentation and Measurement Technology Conference

作者： M. Yeary W. Zhang K. Wong DSP and Embedded Systems Laboratory Department of Electrical and Computer Engineering University of Oklahama Norman OK USA Schlumberger Sugar Land TX USA

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Application specific coarse-grained FPGA for processing element in real time parallel particle filters

Application specific coarse-grained FPGA for processing elem...

引用

IEEE International Workshop on System-on-Chip for Real-Time Applications

作者： M. Sadasivam Sanjing Hong Mobile Systems Design Laboratory Department of Electrical and Computer Engineering State University of New York Stony Brook Stony Brook NY USA

This paper presents an application specific reconfigurable architecture based on coarse-grain FPGA for real-time parallel particle filters. The architecture consists of a set of heterogeneous arithmetic units and buffer banks, where their interconnections are reconfigurable at the hardware level. The proposed architecture separates fixed and reconfigurable units for high-throughput realization. We compare potential throughput of the design with that of commercial FPGAs and DSPs. The proposed architecture is implemented in 0.25 /spl mu/m CMOS process.

关键词： Field programmable gate arrays Particle filters computer architecture Throughput Digital signal processing Particle tracking Filtering Application software Reconfigurable architectures Real time systems

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