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Cascade implementation of CANFs in spectral analysis of short data auditory evoked brainstem responses

Cascade implementation of CANFs in spectral analysis of shor...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： R. Agarwal E.I. Plotkin M.N.S. Swamy Center of Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

Auditory evoked brainstem response (ABR) can be modeled as two closely spaced sinusoids immersed in noise. Conventional methods on the FFT are often not useful in the spectral estimation of short-duration ABRs. The authors propose the use of constrained adaptive notch filters (CANFs) implemented as a cascade of second-order sections, and discuss two special configurations based on CANF combined with a constrained notch filter (CNF) with fixed parameters. The problem associated with the convergence of the direct-form implementation of higher-order CANFs to a local minimum is also addressed. The methods proposed are shown to provide reliable spectral estimation and enhancement of the real data ABRs.< >

关键词： Spectral analysis Frequency Narrowband signal processing Convergence Brain modeling Adaptive filters Electroencephalography Deafness Loss measurement

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Neural LS estimator with a non-quadratic energy function

Neural LS estimator with a non-quadratic energy function

引用

International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： K. Gao M.O. Ahmad M.N.S. Swamy Center of Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

Least-squares (LS) estimation with a standard feedback neural network (SFBNN) which is based on an electrical model is investigated. In the energy function of a SFBNN, a non-quadratic term is included which is often neglected while solving an optimization problem. It is shown that the non-quadratic term affects the solution of a continuous optimization problem. Properties of the non-quadratic term and the relation between the estimation error and several parameters of the SFBNN are discussed. A technique, called extended space iterative search (ESIS), is introduced to reduce the estimation error. Simulation results are presented to confirm the analysis result and the effectiveness of the proposed technique.< >

关键词： Neurofeedback Neural networks Hypercubes Estimation error Cost function signal processing Computational modeling Analytical models Adaptive signal processing Associative memory

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Performance evaluation of a bufferless N*N synchronous Clos ATM switch with priorities and space preemption

Performance evaluation of a bufferless N*N synchronous Clos ...

引用

IEEE International Conference on communications (ICC)

作者： A.A. Nilsson F. Lai H.G. Perros Department of Electrical and Computer Engineering and Center of Communications and Signal Processing North Carolina State University Raleigh NC USA Department of Computer Science and Center of Communications and Signal Processing North Carolina State University Raleigh NC USA

A synchronized bufferless Clos ATM (asynchronous transfer mode) switch with input cell processor queues is considered. The arrival process to each input port of the switch is assumed to be bursty and it is modeled by an interrupted Bernoulli process. Two classes of cells are considered. Service in an input cell processor queue is head-of-line without preemption. In addition, space preemption is used. That is, a high priority cell arriving to a full queue takes the space occupied by the low priority cell with the least waiting time in the queue but not the one in service. Each cell processor queue is modeled as a priority IBP/Geo/1/K+1 queue with space preemption. An exact analysis of the priority queue is presented. The results obtained are then used in an approximation algorithm for the analysis of the ATM switch.< >

关键词： Switches Asynchronous transfer mode Communication switching Multiprocessor interconnection networks signal processing B-ISDN computer architecture Delay effects Queueing analysis signal processing algorithms

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Landmark-based shape recognition by a modified Hopfield neural network

Landmark-based shape recognition by a modified Hopfield neur...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： N. Ansari K. Li Center of Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

A new method is introduced to achieve partial shape recognition by means of a modified Hopfield neural network. Given a scene consisting of partially occluded objects, a model object in the scene is hypothesized by matching the landmarks of the model with those in the scene. A local shape measure, known as the sphericity of a triangular transformation, is used as a measure of similarity between two landmarks. The hypothesis of a model object in a scene is completed by matching the model landmarks with the scene landmarks. The landmark matching task is performed by a modified Hopfield neural network. The location of the model in the scene is estimated with a least squares fit among the matched landmarks. A heuristic measure is then computed to decide if the model is in the scene.< >

关键词： Hopfield neural networks Layout Shape measurement Service robots Humans Libraries Wire signal processing Least squares approximation Application software

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A VLSI DSP chip for real time iterative deconvolution

A VLSI DSP chip for real time iterative deconvolution

引用

IEEE Southeastcon

作者： R.B. Whitted P.B. Crilly Department of Electrical and Computer Engineering Communications Information and Signal Processing Group Knoxville TN USA

The design of a CMOS VLSI chip to perform real-time iterative deconvolution is presented. A bit-level systolic array architecture for convolution, multiplication, and addition is used to implement the circuit. A brief introduction to the iterative deconvolution problem is also given. Simulations done to data have shown that the systolic array portions of the chip will yield satisfactory throughput for millions of iterations per second.< >

关键词： Very large scale integration Digital signal processing chips Deconvolution Systolic arrays Convolution Spectroscopy Fourier transforms Circuits Semiconductor device measurement Iterative methods

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The performance evaluation of a new neural network based traffic management scheme for a satellite communication network

The performance evaluation of a new neural network based tra...

引用

IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record

作者： N. Ansari D. Liu Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

The scheme consists of two levels of management. The front end of the scheme is a derivation of Kohonen's self-organization model to configure maps for the satellite communication network dynamically. The model consists of three stages. The first stage is the pattern recognition task, in which an exemplar map that best meets the current network requirements is selected. The second stage is the analysis of the discrepancy between the chosen exemplar map and the state of the network, and the adaptive modification of the chosen exemplar map to conform closely to the network requirement (input data pattern) by means of Kohonen's self-organization. On the basis of certain performance criteria, whether a new map is generated to replace the original chosen map is decided in the third stage. A state-dependent routing algorithm, which arranges the incoming call to some proper path, is used to make the network more efficient and to lower the call block rate.< >

关键词： Neural networks Telecommunication traffic Routing Satellite communication computer network management Technology management engineering management Traffic control Artificial satellites Communication networks

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Priority-based dynamic access policies to WAN from LAN/MAN

Priority-based dynamic access policies to WAN from LAN/MAN

引用

Conference on Local computer Networks (LCN)

作者： Yong-Hee Jeon I. Viniotis Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

The authors consider the integration problem of LAN/MAN traffic to WAN by ATM/SONET multiplexing. They propose separate buffers for voice and data to efficiently control the throughput of each traffic type. Transmission bandwidth is dynamically and adaptively shared between voice and data to guarantee grade of service (GOS) requirements for each traffic type. The authors propose two algorithms for access policies; the (N/sub 1/,N/sub 2/) scheme and its adaptive variation. Their algorithms do not require the knowledge of arrival statistics. In the fact scheme, they can play with the tradeoff between delay and cell loss probability of each traffic type. In the second scheme, for most of the time and under normal network conditions, voice traffic has higher priority. Data traffic has higher priority when the number of data cells queued reaches a certain threshold. They show how the network performance is affected by several system parameters.< >

关键词： Wide area networks Local area networks Traffic control Telecommunication traffic Asynchronous transfer mode SONET Throughput Bandwidth Statistics Delay

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Estimating 3-D motion and structure parameters of a rigid planar object by establishing landmark correspondence

Estimating 3-D motion and structure parameters of a rigid pl...

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IEEE International Conference on Systems, Man and Cybernetics

作者： N. Ansari H. Agustiawan Center of Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

Results of combining the shape recognition method of N. Ansari and E.J. Delp (1989) and two motion estimation algorithms presented by R.Y. Tsai and T.S. Huary (1981, 1982) to perform motion and structure estimation of a rigid planar object from landmark matching are presented. From all numerical experiments that have been tried, the recognition algorithm can handle the landmark matching tasks well if the object follows a relatively small rigid motion such that the normal of the object surface is not almost perpendicular to the optical axis. Due to the nonlinearity of the computation procedure of the combined algorithm and roundoff error generated by the computer, the estimated parameters deviate up to 10% from the predefined parameters. The combined algorithm is, however, convenient, inexpensive and not shaken by missing or extraneous landmarks in the second view as long as there are more than three landmark corresponding pairs.< >

关键词： Motion estimation signal processing algorithms Probes Equations Shape measurement Optical signal processing Roundoff errors Parameter estimation Layout Matrices

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Bispectrum estimation via autoregressive modeling: a group delay approach

Bispectrum estimation via autoregressive modeling: a group d...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： S.V. Narasimhan G.R. Reddy E.I. Plotkin M.N.S. Swamy Centre of Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal Canada

A new method of bispectrum estimation by an AR (autoregressive) model has been proposed for a signal which is the output of a mixed-phase system driven by a non-Gaussian noise. This is achieved by relating the bispectrum phase and magnitude to the system group delay functions. The maximum and minimum phase property of the group delay functions makes AR bispectrum estimation possible, since there exists a direct relation between the cepstral and AR coefficients. The proposed method uses only the bispectrum information and is applicable for moving average (MA) or AR or ARMA system with either mixed-phase poles or mixed-phase zeros or both. Unlike some of the existing methods, it uses all the bispectral information and does not involve any solution of a system of equations. The method has been illustrated for MA and ARMA systems using sample root mean square error as the performance index.< >

关键词： Delay estimation Brain modeling Cepstral analysis Poles and zeros Root mean square Performance analysis Noise measurement Gaussian noise Spectral analysis Speech

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Performance Evaluation of a Buffer less NxN Synchronous Clos ATM Switch with Priorities and Space Preemption

Performance Evaluation of a Buffer less NxN Synchronous Clos...

引用

1991 IEEE International Conference on communications - communications: Rising to the Heights, ICC 1991

作者： Nilsson, Arne A. Lai, Fuyung Perros, Harry G. Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695-7914 United States Center for Communications and Signal Processing North Carolina State University RaleighNC27695-7914 United States Department of Computer Science North Carolina State University RaleighNC27695-7914 United States

ISBN: (纸本)0780300068

We consider a synchronized bufferless Clos ATM switch with input cell processor queues. The arrival process to each input port of the switch is assumed to be bursty and it is modeled by an Interrupted Bernoulli Process. Two classes of cells are considered. Service in an input cell processor queue is head-of-line without preemption. In addition, space preemption is used. That is, a high priority cell arriving to a full queue takes the space occupied by the low priority cell with the least waiting time in the queue but not the one in service. Each cell processor queue is modeled as a pri-ority IBP/Geo/l/K+1 queue with space preemption. We present an exact analysis of the priority queue. The results obtained are then used in an approximation algorithm for the analysis of the ATM switch. © 1991 IEEE.

关键词： Cells

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