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Annual Conference on Neural Information Processing Systems

作者： Tomaso Poggio Gert Cauwenberghs CLSP ECE Dept. Johns Hopkins University Baltimore MD 21218

ISBN: (纸本)0262122413

An on-line recursive algorithm for training support vector machines, one vector at a time, is presented. Adiabatic increments retain the Kuhn-Tucker conditions on all previously seen training data, in a number of steps each computed analytically. The incremental procedure is reversible, and decremental "unlearning" offers an efficient method to exactly evaluate leave-one-out generalization performance. Interpretation of decremental unlearning in feature space sheds light on the relationship between generalization and geometry of the data.

关键词： Incremental Eigenvector Generalization Support Vector Network Training Support Steps geometry recursive algorithms Learning Training data Sheds

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Efficient camera-space target disposition in a matrix of moments structure using camera-space manipulation

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INTERNATIONAL JOURNAL OF ROBOTICS RESEARCH 1999年第8期18卷 809-818页

作者： González-Galván, EJ Skaar, SB Seelinger, MJ Univ Autonoma San Luis Potosi Fac Ingn Ctr Invest & Estud Posgrad San Luis Potosi SLP Mexico Univ Notre Dame Dept Aerosp & Mech Engn Notre Dame IN 46556 USA

This paper introduces a new estimation approach for determining the sequence of internal manipulator configurations which are required to perform a task on an arbitrarily positioned and oriented workpiece, in the context of the method of camera-space manipulation-a robust and precise means of controlling three-dimensional robot maneuvers using vision. Despite a nonlinear estimation model, a recursive scheme is developed. This approach reduces the computational and memory burden that is required by the "batch" estimation approach while retaining identical results. The same formalism that permits this result is used to condense to a minimum the visual information required to create "camera-space objectives." The discussion includes actual experimental results wherein robust, millimeter sir-axis positioning precision with a three-dimensional, rigid-body task is achieved using a very large GMF S-400 robot.

关键词： camera-space manipulation nonlinear estimation computer vision robotics recursive algorithms

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CBR for the management and reuse of image-processing expertise: a conversational system

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ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE 1999年第6期12卷 733-747页

作者： Ficet-Cauchard, V Porquet, C Revenu, M Inst Sci Mat & Rayonnement GREYC F-14050 Caen France

The development of an image-processing (IP) application is a complex activity, which can be greatly alleviated by user friendly graphical programming environments. The major objective of the work described in this paper is to help TP experts reuse parts of their applications. A first step towards knowledge reuse has been to propose a suitable representation of the strategies of IP experts by means of IP plans (trees of tasks, methods and tools). This paper describes the CBR module of an interactive system for the development of IP plans. After a brief presentation of the overall architecture of the system and its other modules, the authors explain the distinction between an IP case and an IP plan, and give the selection criteria and functions that are used for similarity calculation. The core of the CBR module is a search/adaptation algorithm, whose main steps apr detailed: retrieval of suitable cases? recursive adaptation of the selected one and memorization of new cases. The system's implementation is presently completed. its functioning is described in a session showing the kind of assistance provided by the CBR module during, the development of a new IP application. (C) 1999 Elsevier Science Ltd. All rights reserved.

关键词： case-based reasoning image-processing application reuse interactivity knowledge management recursive algorithms

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A periodically time-varying minimal partial realization algorithm based on twisting

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AUTOMATICA 1999年第9期35卷 1543-1548页

作者： Kuijper, M Univ Melbourne Dept EE Engn Parkville Vic 3052 Australia

The 1975 paper of Meyer and Burrus gave necessary conditions on the coefficients of a periodically time-varying difference equation to generate a prespecified set of impulse responses. The main contribution of the present paper consists of an algorithm that constructs the coefficients of such a periodically time-varying realization of minimal lag. Thus the algorithm solves the minimal partial realization problem for the periodically time-varying (scalar) case. We use a general technique ("twisting") for associating a time-invariant system with a periodically time-varying system in such a way that the time-step is preserved. The technique plays an essential role in the ideas underlying the algorithm. (C) 1999 Elsevier Science Ltd. All rights reserved.

关键词： impulse responses linear systems discrete-time systems time-varying systems difference equations realisation theory recursive algorithms behaviour

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recursive algorithm for fast evaluation of the Abel inversion integral in broadband reflectometry

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REVIEW OF SCIENTIFIC INSTRUMENTS 1999年第1期70卷 1047-1050页

作者： Nunes, FD Santos, J Manso, ME Univ Tecn Lisboa EURATOM IST Assoc Ctr Fusao Nucl Inst Super Tecn P-1096 Lisbon Portugal

The application of Kalman filtering is proposed for the numerical evaluation of plasma density profiles using noisy group delay data obtained from O- mode frequency-modulated broadband reflectometry. This method allows faster computation of the Abel inversion integral than the usual numerical methods (e.g., the trapezoidal rule) while maintaining a good accuracy in the presence of noise. In addition, density profiles with different degrees of smoothing can be produced by adjusting a single parameter. The algorithm seems promising in applications to plasma control in real time. (C) 1999 American Institute of Physics. [S0034-6748(99)70901-9].

关键词： reflectometry numerical calculation recursive algorithms smoothing density profiles Plasma confinement Kalman filtering trapezoidal rule Inversion broadband

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Mechanical response of linear viscoelastic composite laminates incorporating non-isothermal physical aging effects

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COMPOSITES SCIENCE AND TECHNOLOGY 1999年第9期59卷 1411-1427页

作者： Bradshaw, RD Brinson, LC Northwestern Univ Dept Engn Mech Evanston IL 60208 USA

This paper presents a method of predicting the mechanical response of composite laminates including the effects of linear viscoelasticity and physical aging. Effective-time theory has been used to characterize the physical aging behavior of each linear viscoelastic lamina. In accordance with experimental findings, the aging behavior of each lamina is allowed to differ in the shear and transverse directions. The mechanical loading is restricted to the linear range, which decouples the aging and load behavior. A recursive algorithm has been used to solve the hereditary convolution integral that governs the response of each ply. Classical thin-laminate theory is then used to assemble the individual ply response equations and determine the overall laminate response to general in-plane force and moment loading. The method automatically recovers the ply-level stresses and strains, which are often critical to strength and durability predictions. The model can use either lamina compliance or modulus properties as its basis. Several illustrative examples of long-term laminate response to variable loading are presented and the impact of physical aging is explored. It is shown that for multidirectional laminates, the stiffness of the lamina in the fiber directions can allow simplifications of the model. (C) 1999 Elsevier Science Ltd. All rights reserved.

关键词：复合材料力学性能线性粘弹性老化 LAMINATE recursive algorithms physical linear viscoelasticity ageing behavior ageing effects Aging composite laminates

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A generalization of Cattaneo-Mindlin for thin strips

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JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME 1999年第4期66卷 1034-1037页

作者： Jäger, J IBAMA D-91058 Erlangen Germany

In this paper, a generalization of the Cuttaneo-Mindlin solution is derived for thin bonded layers with arbitrary surfaces. We assume that equal layers are in contact, and show that the normal and tangential stress displacement equations are uncoupled and of the same form. In this case the stick condition Sor tangential shift is identical with the contact condition in normal direction, and the tangential problem can be reduced to the normal problem. Finally, a recursive algorithm for general load cases is proposed We believe that this model illustrates typical features of elastic bodies with friction. It call also serve as a model for memory effects, employing the elastic superposition technique.

关键词： thin strip recursive algorithms Tangential stresses normal direction Generalization BOND COATS Identical elastic bodies Memory effect friction Superposition technique Normal

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Splines - A perfect fit for signal and image processing

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IEEE SIGNAL PROCESSING MAGAZINE 1999年第6期16卷 22-38页

作者： Unser, M Swiss Fed Inst Technol CH-1015 Lausanne Switzerland

The article provides arguments in favor of an alternative approachthat uses splines, which is equally justifiable on a theoretical basis,and which offers many practical advantages. To reassure the reader whomay be afraid to enter new territory, it is emphasized that one is notlosing anything because the traditional theory is retained as aparticular case (i.e., a spline of infinite degree). The basiccomputational tools are also familiar to a signal processing audience(filters and recursive algorithms), even though their use in the presentcontext is less conventional. The article also brings out the connectionwith the multiresolution theory of the wavelet transform. This articleattempts to fulfil three goals. The first is to provide a tutorial onsplines that is geared to a signal processing audience. The second is togather all their important properties and provide an overview of themathematical and computational tools available; i.e., a road map for thepractitioner with references to the appropriate literature. The thirdgoal is to give a review of the primary applications of splines insignal and image processing

关键词： filtering theory image processing interpolation signal processing signal resolution signal sampling splines (mathematics) wavelet transforms computational tools digital filtering filters mathematical tools multiresolution theory recursive algorithms sign Image processing recursive algorithms Digital filters signal resolution filtering theory signal processing splines (mathematics) wavelet transforms Interpolation Filters signal sampling

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Adaptive Error Based Thresholding for On-Line Wavelet Compression

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IFAC Proceedings Volumes 1999年第2期32卷 6680-6685页

作者： Manish Misra Shailesh Kumar S. Joe Qin Dick Seemann Department of Chemical Engineering University of Texas at Austin Austin TX 78712 USA Fisher Rosemount Systems Inc. 1712 Centre Creek Drive Austin TX 78754 USA

Wavelet based data compression is superior to interpolative compression techniques like boxcar as wavelets provide an efficient joint time-scale representation of the signal in terms of wavelet coefficients. Thresholding over these coefficients is used to achieve compression. A recursive on-line wavelet based compression algorithm, which combines the high quality of compression of wavelets and on-line implementability of interpolative methods has already been developed. In this paper, an error based thresholding framework is introduced, which adaptively computes these thresholds, given the bounds on root mean square error and local point error. This framework is applied to the recursive on-line wavelet based compression using Haar wavelets. Experiments show that the resulting algorithm gives superior compression as compared to interpolative methods. Moreover, it can be used on-line and provides an effective way of controlling the local point error (LPE) and the root mean square error (RMSE).

关键词： Data compression wavelets recursive algorithms error based thresholding

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recursive calculation of expansion coefficients for generalized orthonormal rational bases

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IFAC Proceedings Volumes 1999年第2期32卷 4141-4146页

作者： Per Bodin S3-Automatic Control The Royal Institute of Technology 100 44 Stockholm Sweden

A recursive scheme is derived for calculation of the expansion coefficients of a known system transfer function into a generalized orthonoimal rational basis. The inherent structure of the basis functions leads to a computationally efficient method, which needs the solution of a low-dimensional Sylvester equation at each step. The method is demonstrated with a brief example. Possible applications are also discussed.

关键词： All pass filters Filter banks Function approximation Least-squares approximation recursive algorithms State-space realization Transfer functions

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