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Phase coherence theory for data-mining and analysis: Application studies in spectroscopy

Phase coherence theory for data-mining and analysis: Applica...

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Opto-Ireland 2005 Conference

作者： Doyle, G McMillan, ND Murtagh, F O'Neill, M Riedel, S Perova, TS Unnikrishnan, S Moore, RA Inst Technol Carlow Carlow Ireland

ISBN: (纸本)0819458082

The paper investigates from the perspective of computer science the phase coherence theory (PCT) and phase coherent data-scatter (PCD-S). These techniques were originally developed for the area of optical tensiographic data mining and analysis but have a more general application in data mining. These developments have recently been augmented with the engineering of a software toolkit called TraceMiner. Although the toolkit was originally devised for tensiography it was developed to perform as a generic data mining and analysis application with PCT, PCD-S and a range of other data mining algorithms implemented. To date the toolkit has been utilised in its main application area, tensiography, but has also been applied to UV-visible spectroscopy. This work presents a critical investigation of the general utility of PCT, PCD-S and the toolkit for data mining and analysis. A new application of PCT and the TraceMiner software toolkit to Raman spectroscopy is presented with discussion of the relevant measures and the information provided by the toolkit. This provides more insight into the generic potential of the techniques for data mining. The analysis performed on theoretical Raman data is augmented with a study of experimental Raman data. Raman spectroscopy is used for composition and fault detection analysis in semiconductor surfaces. Finally, the utility of the PCT technique in comparison with traditional Raman spectroscopy methods is considered together with some more general applications in the field of imaging and machine vision.

关键词： Raman spectroscopy Data mining Data modeling Visualization Spectroscopy Statistical analysis Computer science Semiconductors algorithm development Software development

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Inspection of laser-seam welds in automobile manufacturing

Inspection of laser-seam welds in automobile manufacturing

引用

Conference on Thermosense XXVII

作者： Spellenberg, B Zettner, J Schreer, O Bassler, M Haller, M Lenzi, T Hierl, T Thermosensorik GmbH Erlangen Germany

ISBN: (纸本)0819457671

Recent developments in infrared camera technology, testing methods and data processing algorithms have brought significant progress for high resolution spatial and temporal analysis of thermal radiation. Together with industry standard automation technology and specific infrared image data processing it became possible to non destructively inspect laser welded seams and other types of joints using heat flux analysis subsequent to active thermal excitation. High thermal diffusion coefficients of the usually metallic samples under test make the availability of high-speed infrared cameras as a key hardware component indispensable. Since high-speed infrared cameras with frame rates of at least 500 Hz have become available for commercial applications, non-destructive testing systems with a new class of performance were designed, manufactured, and implemented at industrial sites. Heat flux analysis as a new and robust method of non-destructive testing has been implemented for various types of equipment, ranging from off-line tools for laboratory use to automated robot based systems enabling fast and operator-free in-line inspection. Depending on environment, implementation surroundings, and geometry of objects to be inspected, different types of pulsed or continuous operating heat sources (e.g. flash light, laser,...) are selected. Due to its outstanding industrial relevance some examples of non-destructive testing of laser welded seams in automobile manufacturing are shown.

关键词： Infrared radiation Infrared imaging Convection Thermography Manufacturing Infrared cameras Inspection Heat flux algorithm development Silver

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Feature based registration of fluorescent LSCM imagery using region centroids

Feature based registration of fluorescent LSCM imagery using...

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Medical Imaging 2005 Conference

作者： Lee, SC Bajcsy, P Univ Illinois Natl Ctr Supercomp Applicat Urbana IL 61801 USA

ISBN: (纸本)0819457213

We present a novel semi-automated registration technique for 3D volume reconstruction from fluorescent laser scanning confocal microscope (LSCM) imagery. The developed registration procedure consists of (1) highlighting segmented regions as salient feature candidates, (2) defining two region correspondences by a user, (3) computing a pair of region centroids, as control points for registration, and (4) transforming images according to estimated transformation parameters determined by solving a set of linear equations with input control points. The presented semi-automated method is designed based on our observations that (a) an accurate point selection is much harder for a human than an accurate region (segment) selection, (b) a centroid selection of any region is less accurate by a human than by a computer, and (c) registration based on structural shape of a region rather than on intensity-defined point is more robust to noise and to morphological deformation of features across stacks. We applied the method to image mosaicking and image alignment registration steps and evaluated its performance with 20 human subjects on LSCM images with stained blood vessels. Our experimental evaluation showed significant benefits of automation for 3D volume reconstruction in terms of achieved accuracy, consistency of results and performance time. In addition, the results indicate that the differences between registration accuracy obtained by experts and by novices disappear with an advanced automation while the absolute registration accuracy increases.

关键词： Image registration Human subjects 3D image processing Tissues 3D modeling Image segmentation algorithm development Confocal microscopy 3D image reconstruction Software development

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A prospective modular platform of the mask pattern automatic inspection using the die-to-database method

A prospective modular platform of the mask pattern automatic...

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Conference on Photomask and Next-Generation Lithography Mask Technology XII

作者： Avakaw, S Korneliuk, A Tsitko, A Planer State Sci & Prod Concern Precis Machine Bl Minsk 220763 BELARUS

ISBN: (纸本)0819458538

The paper presents a description of a new modular automatic reticle defect inspection platform and also a description of one of the main elements of this platform - a defect detection sub-system. This platform is currently under active development at Planar Concern. This paper presents the results of the use of the object-oriented approach which was used in the development of the defect detection algorithms for the die-to-database reticle inspection system. Furthermore, the paper presents briefly the architecture and technology of the new modular automatic reticle inspection platform.

关键词： Inspection Reticles Defect detection Detection and tracking algorithms Image processing algorithm development Photomasks Databases Sensors Image transmission

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Exploiting phase transitions for fusion optimization problems

Exploiting phase transitions for fusion optimization problem...

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Conference on Signal Processing, Sensor Fusion, and Target Recognition XIV

作者： Svenson, P Swedish Def Res Agcy Dept Data & Informat Fus Div Command & Control Syst SE-16490 Stockholm Sweden

ISBN: (纸本)0819457949

Many optimization problems that arise in multi-target tracking and fusion applications are known to be NP-complete, i.e., believed to have worst-case complexities that are exponential in problem size. Recently, many such NP-complete problems have been shown to display threshold phenomena: it is possible to define a parameter such that the probability of a random problem instance having a solution jumps from 1 to 0 at a specific value of the parameter. It is also found that the amount of resources needed to solve the problem instance peaks at the transition point. Among the problems found to display this behavior are graph coloring (aka clustering, relevant for multi-target tracking), satisfiability (which occurs in resource allocation and planning problem), and the travelling salesperson problem. Physicists studying these problems have found intriguing similarities to phase transitions in spin models of statistical mechanics. Many methods previously used to analyze spin glasses have been used to explain some of the properties of the behavior at the transition point. It turns out that the transition happens because the fitness landscape of the problem changes as the parameter is varied. Some algorithms have been introduced that exploit this knowledge of the structure of the fitness landscape. In this paper, we review some of the experimental and theoretical work on threshold phenomena in optimization problems and indicate how optimization problems from tracking and sensor resource allocation could be analyzed using these results.

关键词： Sensors Detection and tracking algorithms algorithm development Data fusion Optimization (mathematics) Analytical research Glasses Mechanics Statistical analysis Statistical modeling

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Vibration control via disturbance rejection through left eigenvector assignment

Vibration control via disturbance rejection through left eig...

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Smart Structures and Materials 2005 Conference

作者： Wu, TY Wang, KW Penn State Univ Dept Mech & Nucl Engn University Pk PA 16802 USA

ISBN: (纸本)0819457418

The objective of this research is to investigate the feasibility of utilizing left eigenvector assignment for vibration disturbance rejection. In the previous study(1), it has been shown that through right eigenvector assignment and modal confinement, one can enhance the performance of periodic vibration isolators. However, it was also recognized that since vibration mode confinement is based on the concept of modal response, it does not guarantee that vibration will always be reduced in a forced excitation scenario. In this research, the left eigenvector assignment technique is utilized to achieve vibration suppression throughout a broad frequency range. The principle is to alter the left eigenvectors of the closed-loop system so that the system's forcing vectors are as closely orthogonal to each left eigenvector as possible. With such an approach, one can directly attack the forced response problem. A new formulation is developed so that the desired left eigenvectors of this integrated system are selected through solving a generalized eigenvalue problem, where the orthogonality indices between the forcing vector and the left eigenvectors are minimized. The integrated system with assigned left eigenvectors achieves to reject external disturbance of the complete electromechanical system. An integrated closed-loop system with state estimator is also developed so that the algorithm can be implemented realistically. Numerical simulations are performed to evaluate the effectiveness of the proposed method on disturbance rejection for an isolator design example. Frequency responses of the isolator in the selected frequency range are illustrated. It is shown that with the left eigenvector assignment technique, the system's external disturbances are rejected and vibration amplitude of the isolated regions can be effectively suppressed.

关键词： System integration Vibration isolation Optical isolators Vibration control algorithm development Matrices Numerical simulations Electromechanical design Control systems Feedback control

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Statistical model of interpolation and its application to texture segmentation

Statistical model of interpolation and its application to te...

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8th International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering

作者： Bakhvalov, YN Potapov, AS Cherepovets State Univ Cherepovets 162600 Russia

ISBN: (纸本)0819458244

The work addresses the problem of pattern recognition as the task of n-dimensional interpolation of the probability density function with subsequent thresholding. Interpolating function that describes given learning data set is treated as a random process. The task is reduced to simultaneous linear equations. The proposed method can be considered as the construction of an RBF neural network with nonstandard transfer function. The transfer function is chosen to minimize energy of the random process spectrum. Applications of the developed algorithm to the task of texture segmentation are given and comparison with alternative approaches is carried out.

关键词： Image segmentation Neural networks Pattern recognition Correlation function Detection and tracking algorithms 3D modeling algorithm development Data modeling Evolutionary algorithms Statistical analysis

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Efficiently querying spatial histograms

Efficiently querying spatial histograms

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Conference on Storage and Retrieval Methods and Applications for Multimedia 2005

作者： Wang, YJ Santini, S Gupta, A Univ Calif San Diego San Diego CA 92103 USA

ISBN: (纸本)0819456551

In this paper, we examine the problem of efficiently computing a class of aggregate functions on regions of space. We first formalize region-based aggregations for a large class of efficient geometric aggregations. The idea is to represent the query object with pre-defined objects with set operations, and compute the aggregation using the pre-computed aggregation values. We first show that it applies to existing results about points and rectangular objects. Since it is defined using set theory instead of object shapes, it can be applied to polygons. Given a database D of polygonal regions, a tessellation T of the plane, and a query polygon q constructed from T, we prove that the aggregation over q can be calculated by the aggregation over triangles and lines constructed from segments and vertices in q, which can be pre-computed. The query time complexity is O(klogn), where k is the size of query polygon and n is the size of T.

关键词： Databases Image segmentation Proteins Brain Neuroimaging Lawrencium Fourier transforms algorithm development Medical research Multimedia

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Designing an adaptive semiactive magneto rheological seat suspension for heavy truck applications

Designing an adaptive semiactive magneto rheological seat su...

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Smart Structures and Materials 2005 Conference

作者： Ahmadian, M Song, XB Sandu, C Virginia Tech Dept Mech Engn Ctr Vehicle Syst & Safety Blacksburg VA 24061 USA

ISBN: (纸本)0819457418

The primary purpose of this paper is to present the theories leading to the development of a semiactive adaptive controller for nonlinear systems. The adaptive algorithm developed in this paper is applied to one class of nonlinear vibration systems, namely semiactive base-excited vibration isolation systems. The algorithm includes the on-line system identification and the adaptation of the control signal. Finally, the stability of the semiactive adaptive system is presented.

关键词： Adaptive control Complex systems System identification Control systems Systems modeling algorithm development Nonlinear control Dynamical systems Digital filtering Nonlinear filtering

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Modified LMS feed-forward control for vibration isolation with actuator limits

Modified LMS feed-forward control for vibration isolation wi...

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Smart Structures and Materials 2005 Conference

作者： Zuo, L Nayfeh, SA Abbott Labs Global Pharmaceut Res & Dev Automat Engn Abbott Pk IL 60064 USA

ISBN: (纸本)0819457418

We propose a modified LMS algorithm for adaptive feedforward control with actuator limits. Unlike the leaky LMS method, which limits the controller effort by introducing an auxiliary cost, in the proposed algorithm we maintain the cost as the performance measurement. We derive the true stochastic gradient of the cost for systems with saturation with respect to the filter coefficients and obtain an adaptation rule very close to that of the filtered-x algorithm, but in the proposed algorithm, the reference filter is a time-varying modification of the secondary channel. In simulations of an active vibration isolation system with actuator limits, the proposed algorithm attains better performance than that attained by the leaky LMS algorithm.

关键词： Actuators Vibration isolation algorithm development Computer simulations Adaptive control Active vibration control Stochastic processes Digital filtering Finite impulse response filters Vibration control

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