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Extrapolation of Nystrom solution for two-dimensional nonlinear Fredholm integral equations

Journal of Scientific Computing 1999年第2期14卷 197-209页

作者： Guoqiang, Han Jiong, Wang Dept. of Mathematical Engineering University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Department of Computer Science South China University of Technology Guangzhou Guangdong Province China Dept. of Comp. and Electron. Eng. Guangdong Prov. Inst. Tech. Person Guangzhou Guangdong Province China

In this paper, we analyze the existence of asymptotic error expansion of Nystrom solution for two-dimensional nonlinear Fredholm integral of the second kind. We show that the Nystrom solution admits an error expansion in powers of the step-size h and the step-size k. For a special choice of the numerical quadrature, the leading terms in the error expansion for the Nystrom solution contain only even powers of h and k, beginning with terms h2p and k2q. These expansions are useful for the application of Richardson extrapolation and for obtaining sharper error bounds. Numerical examples show that how Richardson extrapolation gives a remarkable increase of precision, in addition to faster convergence.

关键词： Extrapolation

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Relevancy of time-frequency features for phonetic classification measured by mutual information

Relevancy of time-frequency features for phonetic classifica...

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

作者： H. Yang S. van Vuuren H. Hermansky Dept. of Comput. Sci. & Eng. Oregon Graduate Inst. of Sci. & Technol. Beaverton OR USA Department of Electrical and Computer Engineering Oregon Graduate Institute Beaverton OR USA

In this paper we use mutual information to study the distribution in time and frequency of information relevant for phonetic classification. A large database of hand-labeled fluent speech is used to (a) compute the mutual information between phoneme labels and a point of logarithmic energy in the time-frequency plane and (b) compute the joint mutual information between phoneme labels and two points of logarithmic energy in the time-frequency plane.

关键词： Time frequency analysis Mutual information Databases Speech analysis Automatic speech recognition Signal analysis Frequency measurement Electric variables measurement Time measurement computer science

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Some design issues for robust data hiding systems

Some design issues for robust data hiding systems

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Asilomar Conference on Signals, Systems & computers

作者： M. Ramkumar A.N. Akansu Dept. of Electr. & Comput. Eng. New Jersey Inst. of Technol. Newark NJ USA The Department of Electrical and Computer Engineering New Jersey Institute of Technology New Jersey Center for Multimedia Research University Heights Newark NJ USA

We explore the intricacies of the duality of data hiding and data compression to help develop optimal data hiding techniques for images, that can reasonably resist lossy compression. The problem of efficient data hiding is split into two sub-problems-one of maximizing the resource-which is the permitted distortion of images, and the other of efficient use of the resource by means of sophisticated signaling techniques. Various options for the solutions of the former problem are proposed and their advantages and disadvantages explored. An optimal data hiding scheme making "good" use of the resource, using sophisticated signaling techniques is proposed.

关键词： Robustness Data encapsulation Image coding Data mining Communication system control Video compression Data compression Resists Distortion Protection

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Characterization of mobility patterns based on cell topography in a cellular radio system

Characterization of mobility patterns based on cell topograp...

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IEEE International Conference on Personal Wireless Communication

作者： A. Chandra D. Bansal R. Shorey A. Kulshreshtha M. Gupta Dept. of Comput. Sci. Indian Inst. of Technol. New Delhi India Computer Science Department Indian Institute of Technology New Delhi India IBM Solutions Research Center Indian Institute of Technology New Delhi India

Teletraffic modelling of users is crucial for cellular system layout and planning, and to evaluate tradeoffs in system design issues. In order to be useful, the model should capture mobility under the most generalized conditions. We develop models that incorporate general mobility patterns that are induced by the cell topography (e.g., road layout, street orientation, density of intersections). In particular, we study the effect of the different mobility patterns on the handoff probability. The mobility patterns are induced by common terrains such as random, Manhattan, circular and highway. The results suggest that we may be able to estimate the handoff probabilities from a knowledge of the cell terrain, the mobile trajectory, and the vehicular movements in a cellular network, and thus may serve as a useful guide for cellular network engineering.

关键词： Surfaces Land mobile radio cellular systems Road transportation Terminology Mobile computing technology planning Probability Knowledge engineering Microcell networks Time measurement

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Science and engineering for Software Development: A Recognition of Harlan ***' Legacy 99

Science and Engineering for Software Development: A Recognit...

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1999 International Conference on Softeare engineering

作者： Victor Basili Tom DeMarco Ali Mili Dept. of Computer Science University of Maryland College park MD The Atlantic Systems Guild 353 West 12th Street New York NY Inst. for Software Research 1000 Technology Drive Fairmont WV

This colloquium is organized in honor of Dr Harlan *** (1919-1996), and is intended to celebrate his legacy in the theory and practice of software engineering.

ISBN: (纸本)9781581130744

This colloquium is organized in honor of Dr Harlan *** (1919-1996), and is intended to celebrate his legacy in the theory and practice of software engineering.

关键词： Software design computer software Software engineering Legacy engineering Pride Science colloquia

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Combined clustering and neural network approach for analog multiple hard fault classification

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Journal of Electronic Testing: Theory and Applications (JETTA) 1999年第3期14卷 207-217页

作者： El-Gamal, M.A. Abu El-Yazeed, M.F. Dept. of Math. and Computer Science United Arab Emirates University Al-Ain United Arab Emirates Department of Physics United Arab Emirates University Al-Ain United Arab Emirates Dept. of Eng. Phys. and Mathematics Faculty of Engineering Cairo University Giza Egypt Dept. of Electronics and Commun. Faculty of Engineering Cairo University Giza Egypt Ohio University Athens OH United States Natl. Inst. of Std. and Technology Gaithersburg MD United States

A new neural network-based fault classification strategy for hard multiple faults in analog circuits is proposed. The magnitude of the harmonics of the Fourier components of the circuit response at different test nodes due to a sinusoidal input signal are first measured or simulated. A selection criterion for determining the best components that describe the circuit behaviour under fault-free (nominal) and fault situations is presented. An algorithm that estimates the overlap between different faults in the measurement space is also introduced. The learning vector quantization neural network is then effectively trained to classify circuit faults. Performance measures reveal very high classification accuracy in both training and testing stages. Two different examples, which demonstrate the proposed strategy, are described.

关键词： Electronic equipment testing

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A modular and scalable architecture for the realization of high-speed programmable rank order filters

A modular and scalable architecture for the realization of h...

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Annual IEEE International ASIC/SOC Conference

作者： I. Hatirnaz F.K. Gurkaynak Y. Leblebici Dept. of Electr. & Comput. Eng. Worcester Polytech. Inst. MA USA Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA USA Worcester Polytechnic Institute Worcester MA US

ISBN: (纸本)0780356322

We present a new scalable architecture for the realization of fully programmable rank order filters (ROF), based on Capacitive Threshold Logic (CTL) gates. Variants of ROFs, especially median filters, are widely used in digital signal and image/video processing and image enhancement. The CTL-based realization of the majority gates used in the ROF architecture allows the filter rank and the window size to be user-programmable, using a much smaller silicon area, compared to conventional realizations of digital median filters. The proposed filter architecture is completely modular and scalable, and the circuit complexity grows only linearly with maximum window size and with word length. Detailed post-layout simulations of the ROF prototype circuit indicate that the new architecture can accommodate sampling clock rates of up to 50 MHz, corresponding to an effective data processing rate of 800 Mb/s for a filter with window size 63 and word length of 16 bits.

关键词： Digital filters Logic gates Signal processing Image enhancement Silicon Complexity theory Circuit simulation Virtual prototyping Sampling methods Clocks

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VERITAS-an application for knowledge verification

VERITAS-an application for knowledge verification

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： J. Santos C. Ramos Z.A. Vale A. Marques Dept. of Comput. Eng. Polytech.. Inst. of Porto Portugal Institute of Engineering Department of Computer Engineering Polytechnic Institute of Porto Porto Portugal Institute of Engineering Department of Electrical Engineering Polytechnic Institute of Porto Porto Portugal EDP Group REN-Portuguese Transmission Network Maia Portugal

Knowledge management is one of the most important goals of any organization. Therefore, several automatic tools are used for that purpose, e.g. Knowledge Based Systems (KBS), Experts Systems, Data Mining Applications and computer Aided Decision Systems. The validation and verification (V&V) process is fundamental in order to ensure the quality of used knowledge. The usage of automatic verification tools can be a reliable, inexpensive and reusable way to overcome the constant growth of the Knowledge Bases, the shortening of development times and the costs of Validation, specially field tests. This paper addresses the verification of Knowledge Based Systems, focussing on VERITAS, a verification tool initially developed to verify a KBS used to assist operators of Portuguese Transmission Control Centers in incident analysis and power restoration VERITAS performs knowledge base structural analysis allowing the detection of knowledge anomalies.

关键词： Knowledge based systems Application software Performance analysis Knowledge management Expert systems Data mining computer applications Costs Automatic testing Control systems

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Electroencephalographic (EEG) correlates of some activities which may alter consciousness: The transcendental meditation technique, musicogenic states, microwave resonance relaxation, healer/healee interaction, and alertness/drowsiness

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Informatica (Ljubljana) 1999年第3期23卷 399-412页

作者： Raković, D. Tomašević, M. Jovanov, E. Radivojević, V. Šuković, P. Martinović, Ž. Car, M. Radenović, D. Jovanović-Ignjatić, Z. Škarić, L. Faculty of Electrical Engineering PO Box 35-54 Belgrade Serbia Vinča Inst. of Nucl. Sciences PO Box 522 Belgrade Serbia Institute M. Pupin Computer Systems Dept. PO Box 15 Belgrade Serbia Institute for Mental Health Dept. of Clinical Neurophysiology Belgrade Serbia Institute for Biological Research Center for Multidisciplinary Studies Belgrade Serbia Private Medical Practice LAV Belgrade Serbia

A key problem of finding the most complete and useful theory of consciousness may revolve around how to empirically determine different styles or states of consciousness and how to incorporate these within a single paradigm. This was our motivation to start examination of EEG correlates of some activities or substates of consciousness which occur spontaneously or are induced artificially. Our investigations demonstrated more or less characteristic features in 25 subjects practicing the transcendental meditation program (increased β power in prefrontal region, increased θ power in left frontal and right temporal regions, increased α power in both temporal regions, and correlation between increased α power and decreased correlation dimension), 6 subjects with 4 types of spiritual music provided to induce musicogenic states (with significant changes in only 3 cases out of 24, where increased θ and α power was observed in only those subjects who have described their musical experiences as very pleasant), 28 subjects of relaxation induced by microwave resonance therapy applied to corresponding acupuncture points (with slightly decreased EEG power in all frequency bands, especially in the left central region, which can be ascribed to higher activation of the stimulated left circulatory part of the acupuncture system;it should be also noted that persons not previously subjected to this treatment responded stronger, presumably as a consequence of the more imbalanced acupuncture system), 5 healer/healee, noncontact interactions (with increase in the maximum mean coherence of their EEG patterns in the α band observed only in short 4 s time intervals), and 30 subjects for monitoring alertness/drowsiness level (with implemented automatic procedure of the neural network classifier to assess the correlation between EEG power spectrum fluctuations related to changes of vigilance level, demonstrating linear separability of the states of alert wakefulness and drowsy wakefulness, all

关键词： Electroencephalography

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Balanced-realization based adaptive IIR filtering

Balanced-realization based adaptive IIR filtering

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

作者： S.G. Sankaran A.A. Beex Bradley Dept. of Electr. Eng. & Comput. Eng. Virginia Polytech. Inst. & State Univ. Blacksburg VA USA Systems Group-DSP Research Laboratory The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

Balanced-realizations are attractive for adaptive filtering, due to their minimum parameter sensitivity and due to their usefulness in model-reduction problems. A balanced-realization based adaptive IIR filtering algorithm is presented. The proposed algorithm uses a stochastic-gradient based search technique to minimize the output error. The algorithm inherently guarantees that the adaptive filter will always remain stable, which obviates the need for the usual stability check after adaptation. Since the algorithm minimizes the output error, the resulting estimates are unbiased. We try to avoid possible convergence to local minima of the output-error surface by using "good" initial estimates, as obtained from equation-error based adaptive filters. Simulation results show that the proposed algorithm converges to the global minimum of the output-error surface.

关键词： Adaptive filters IIR filters Filtering algorithms Equations Mathematical model Convergence Controllability Observability Digital signal processing Laboratories

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