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检索条件"主题词=Algorithm Development"

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OVERVIEW OF CREOL PROGRAMS IN LASER-RADAR

OVERVIEW OF CREOL PROGRAMS IN LASER-RADAR

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CONF ON APPLIED LASER RADAR TECHNOLOGY, AT THE 1993 INTERNATIONAL SYMP ON OPTICAL ENGINEERING AND PHOTONICS IN AEROSPACE AND REMOTE SENSING

作者： STICKLEY, CM CREOL/Univ. of Central Florida (United States)

ISBN: (纸本)0819411728

This paper summarizes progress toward developing coherent ladar technology using arrays of subapertures for coping with target-induced speckle which can reduce the carrier-to-noise ratio for ladar systems. We have selected an optimum receiver design, developed algorithms for determining how to co-phase the IF signals from the different sub-apertures/receivers, and have begun to test these on a two-aperture, coherent 1064 nm ladar. Computer simulations of the ladar are being developed including partially developed speckle effects from the target. Target speckle has been measured from different materials and at two different wavelengths for bench-marking the computer simulations. We have measured and are developing the theory for the time-dependent optical phase shifts observed from a rough, rotating target. The signal enhancement has been calculated that might be expected for a rough target illuminated by a coherent, 1064 nm laser. Finally, we have designed and are beginning to implement an experiment to show that imaging through a turbulent medium can be achieved.

关键词： LIDAR Speckle Receivers Computer simulations Laser applications Aluminum Scattering algorithm development Laser scattering Light scattering

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LASER-INDUCED FLUORESCENCE DETECTION OF CARDIOVASCULAR CALCIFIED DEPOSITS VIA TETRACARBOXYLATE ION DYE PROBING 3

LASER-INDUCED FLUORESCENCE DETECTION OF CARDIOVASCULAR CALCI...

引用

3RD CONF ON DIAGNOSTIC AND THERAPEUTIC CARDIOVASCULAR INTERVENTIONS

作者： PAPAZOGLOU, TG KATERINOPOULOS, HE FOTAKIS, C IATRIDOU, H FOUKARAKI, E Institute of Electronic Structure and Laser (Greece) Univ. of Crete (Greece)

ISBN: (纸本)0819411051

In this paper we evaluate whether argon-ion laser induced fluorescence could help to discriminate atheromatous from normal tissue stained with tetracarboxylate ion dyes. Eighteen cadaveric abdominal aortic samples (9 normal, 9 atherosclerotic) from 4 autopsies were obtained in an unfixed state within 12 hours of death. They were incubated in the dye solution for two hours and then they were rinsed in saline for another two hours to ensure that only dye bound to the tissue was present during the experiment. An argon ion laser (476.5 nm) was used for excitation. Fluorescence was collected by a 600 micrometers core diameter step-index UV-visible fiber. The fiber was butt-connected to the 20 micrometers slit of a 0.25 m spectrograph. Data acquisition and analysis were performed via an optical multichannel analyzer. A characteristic increase of the fluorescence signal at the 520 to 560 nm spectral region for atheromatous tissue was observed after treatment of the samples with the dye. This allowed the development of a simple discriminatory index (spectrum integral from 520 to 560 nm vs. spectrum integral from 580 to 620 nm).

关键词： Luminescence Ions Tissues Laser induced fluorescence Argon ion lasers Fluorescence spectroscopy Laser tissue interaction Spectrographs algorithm development Laser applications

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PIPELINED IMPLEMENTATION OF HIGH-SPEED STAR-RLS ADAPTIVE FILTERS 4

PIPELINED IMPLEMENTATION OF HIGH-SPEED STAR-RLS ADAPTIVE FIL...

引用

4TH CONF ON ADVANCED SIGNAL PROCESSING algorithmS, ARCHITECTURES, AND IMPLEMENTATIONS

作者： RAGHUNATH, KJ PARHI, KK Univ. of Minnesota/Twin Cities (United States)

ISBN: (纸本)0819412767

The popular QR decomposition based recursive least-squares (RLS) adaptive filtering algorithm (referred to as QRD-RLS) has a limited speed of operation depending on the processing time of each individual cell. A new scaled tangent rotation based STAR-RLS algorithm has been designed which is suitable for fine-grain pipelining and also has a lower complexity. The inter-cell communication is also reduced by about half. A direct application of look-ahead to STAR-RLS can still lead to some increase in hardware. In this paper look- ahead is applied using delayed update operations such that the complexity is reduced while maintaining a fast convergence. The pipelined STAR-RLS (or PSTAR-RLS) algorithm requires the same number of operations (multiplications or divisions) as the serial STAR-RLS algorithm. Practical issues related to the STAR-RLS algorithm such as numerical stability and dynamic range are also examined.

关键词： Digital filtering algorithm development Error analysis Stars Tantalum Very large scale integration Data modeling Image processing Numerical stability Thulium

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WATER SPECTRAL LIBRARIES FOR THE INTERPRETATION OF IMAGE SPECTROMETRIC DATA

WATER SPECTRAL LIBRARIES FOR THE INTERPRETATION OF IMAGE SPE...

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Imaging Spectrometry of the Terrestrial Environment Conference

作者： NOVO, EM JET PROP LAB PASADENACA 91109

ISBN: (纸本)0819411736

This paper reports the assessment of water reflectance spectra measured under controlled condition for analysis of the imaging spectrometry data of inland waters. The application of imaging spectrometry to the study of inland waters depends on a better understanding of the optical properties of the water components. To increase this understanding, a collection of water spectra has been measured under laboratory and ground control conditions as a part of an EOS interdisciplinary investigation. The radiometric measurement derived from those experiments is known as the Bidirectional Reflectance Function (BRDF). R was simulated using variations of a model derived from the two stream approximation of the radiative transfer equation (RTE) and compared to the BRDF. BRDF was also measured 'in situ' from a boat based spectrometer (BoaR) and from an helicopter based spectrometer (HeIR). Modelled R (MoIR), laboratory measured (BRDF) (LabR) and ground measured BRDF (BoaR and HeIR) were compared. They were also used to unmix the spectra of two different aquatic systems. Preliminary results show that at low chlorophyll and gilvin concentration, there is a good agreement between ModR and LabR, regardless of the model variation used. For both low and high inorganic matter concentration, the agreement between ModR and LabR is poor. All sets of data present the main features which characterize the high chlorophyll concentration reflectance spectra, but the amount of reflectance displayed by LabR and ModR is 50 times smaller than that measured in situ. When the different sets are used as input to unmixing algorithms they also yield different results.

关键词： Reflectivity Water Optical properties Absorption Spectroscopy Bidirectional reflectance transmission function Active optics algorithm development Data modeling Radiative transfer

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DIFFUSE TOMOGRAPHY

DIFFUSE TOMOGRAPHY

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CONF ON PHYSIOLOGICAL IMAGING, SPECTROSCOPY, AND EARLY-DETECTION DIAGNOSTIC METHODS

作者： GRUNBAUM, FA ZUBELLI, JP Univ. of California/Berkeley (United States) Instituto de Matematica Pura e Aplicada (Brazil)

ISBN: (纸本)0819411140

We consider certain models that have been used recently to describe photon migration in a random media with the purpose of imaging this unknown media on the basis of boundary measurements. We discuss the performance of numerical algorithms to tackle the reconstruction problem associated to such models. Some of these algorithms are of nonlinear optimization type, while others proceed in a finite number of steps and do not require iteration. We study also the effect of noise in the performance of these algorithms as well as the deterioration of their performance as the amount of data is reduced.

关键词： Reconstruction algorithms Sensors Particles Inverse problems 3D modeling Tomography Optimization (mathematics) algorithm development Medical imaging Performance modeling

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PROBLEM OF DESIGN AND TESTING OF HIGH-CURRENT MEASURING TRANSDUCERS

PROBLEM OF DESIGN AND TESTING OF HIGH-CURRENT MEASURING TRAN...

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2nd International Symposium on Measurement Technology and Intelligent Instruments

作者： DMOCHOWSKI, Z BIALYSTOK TECH UNIV DEPT ELECT ENGNBIALYSTOKPOLAND

ISBN: (纸本)0819413844

The high-current measuring transformers are applied first of all in steelmaking and foundry arc furnaces. A block diagram of the OPTIMUM program and its exploitation characteristics are presented. Calculation examples are given. Design solutions of measuring transformers in the versions with air and resin insulation are discussed. The scope of acceptance tests of the measuring transformers based on the BN- 88/3027- 01 branch standard " High-current measuring transformers for furnaces. Requirements and testing " is revived. Typical outfit of test stations for testing measuring transformers as well as results of tests of High -current transformers are given. Specific problems related design, production and testing of linear transducers are discussed. Properties of bothtypes of transducers are compared under the angle of reliability, metrological properties, mass and overall dimensions, the scope of acceptance tests and the immunity to the influence of strong magnetic fields. It was established that high-current transformers are built up to a ratio 5OkA/5A(for furnaces with capacity of 50*10kg), while linear transducers can be also built for rated currents of 200kA (thus for furnaces of any rated capacity).

关键词： Transformers Transducers Magnetism Reliability Metrology Prototyping algorithm development Computer simulations Device simulation Product engineering

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OPTIMAL LEARNING CAPABILITY ASSESSMENT OF MULTICATEGORY NEURAL NETS 2

OPTIMAL LEARNING CAPABILITY ASSESSMENT OF MULTICATEGORY NEUR...

引用

CONF ON SCIENCE OF ARTIFICIAL NEURAL NETWORKS 2

作者： VILLALOBOS, L MERAT, FL Case Western Reserve Univ. (United States)

ISBN: (纸本)0819412023

In this paper, it is shown that supervised learning can be posed as an optimization problem in which inequality constraints are used to encode the information contained in the training patterns and to specify the degree of accuracy expected from the neural network. Starting from this point, a technique for evaluating the learning capability and optimizing the feature space of a class of higher-order neural networks is developed. The technique gives significant insight into the problem of task learning. It permits establishing whether the structure of the network can effectively learn the training patterns. Should the structure not be appropriate for learning, it indicates which patterns form the minimum set of patterns which cannot be learned with the desired accuracy. Otherwise, it provides a connectivity which produces satisfactory network performance. Furthermore, it identifies those features which can be suppressed from the definition of the feature space without deteriorating network performance. Several examples are presented and results are discussed.

关键词： Neural networks Tolerancing Machine learning Neurons Artificial neural networks Computer programming Intelligence systems Optimization (mathematics) Silicon algorithm development

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ONLINE SURFACE INSPECTION FOR CONTINUOUS CAST-ALUMINUM STRIP

ONLINE SURFACE INSPECTION FOR CONTINUOUS CAST-ALUMINUM STRIP

引用

Conference on Computer Vision for Industry

作者： FERNANDEZ, C CAMPOY, P PLATERO, C SEBASTIAN, JM ARACIL, R UNIV POLITECN MADRID DEPT SYST & ELECTRMADRIDSPAIN

ISBN: (纸本)0819412384

A general architecture for detecting and analyzing surface defects in aluminum strip is described. Information concerning visual information from the aluminum surface, surface temperature and strip dimensions--profile thickness-is processed jointly by means of an expert system in order to determine the quality level of each aluminum coil produced; control actions over the casting process, derived from this information, are also suggested by an expert system. This paper shows in deep work related to surface image analysis. The data volume to be processed, up to 20 Mbytes/s, has forced up the development of a high parallel architecture for high-speed image processing. A specially suitable lighting system has been developed for enhancing matrical image acquisition from metallic surfaces that includes reflect avoidance as well as uniform incident angle of light along the scanned portion of surface--about 120000 square mm.

关键词： Aluminum Inspection Image processing Defect detection Image segmentation Machine vision Computer vision technology Optical inspection algorithm development Image analysis

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ADAPTIVE ANTENNA BEAMFORMING USING ORTHOGONAL DECOMPOSITION 4

ADAPTIVE ANTENNA BEAMFORMING USING ORTHOGONAL DECOMPOSITION

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4TH CONF ON ADVANCED SIGNAL PROCESSING algorithmS, ARCHITECTURES, AND IMPLEMENTATIONS

作者： YU, KB GE Corporate Research and Development Ctr. (United States)

ISBN: (纸本)0819412767

An algorithm has been developed to control the antenna array beam pattern for multiple beam antenna (MBA) or phased array systems. The algorithm is motivated by military satellite communications applications where the uplink received antenna is desired to provide beamforming capability for selective earth coverage and jamming protection. The problem can be formulated as to determine the control weight to meet the user gain and jammer null requirements in their known directions subject to the norm constraint of the weight defined by the power conservation law. The algorithm makes use of an orthogonal decomposition of the weight vector into the constraint weight vector and the zero-output weight vector. If the constraint weight vector satisfies the norm bound constraint, the zero-output vector can further be optimized to minimize the deviation of the resulting weight from the quiescent weight. If the constraint weight vector does not satisfy the norm bound constraint, a recursive procedure has been developed which provides flexibility in the determination of the constraint vectors, the constraint order and the constraint phase optimization. This algorithm provides a practical means to achieve the constraints subject to the norm bound condition.

关键词： Antennas algorithm development Phased arrays Control systems Nulling interferometry Satellite communications Telecommunications Data processing Mobile communications Receivers

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DISTRIBUTION BASED BACKGROUND AND THRESHOLD ESTIMATIONS FOR SMALL TARGET DETECTION IN AN INFRARED IMAGING-SYSTEM

DISTRIBUTION BASED BACKGROUND AND THRESHOLD ESTIMATIONS FOR ...

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Conference on Infrared Imaging System: Design, Analysis, Modeling, and Testing IV

作者： LEWIS, CP AUTOMATED SCI GRP INC HUNTSVILLEAL 35816

ISBN: (纸本)0819412058

This paper presents a method for generating quick and accurate background level estimations with corresponding threshold level estimations from a distribution profile of time delay integration (TDI) scanning focal plane array (FPA) detector values. The resulting background and threshold parameters are used to separate target signal contribution from background and noise contributions. This method was developed for use in a real-time multiprocessor based infrared (IR) imaging and signal processing system. The algorithms developed for the system have been designed and tested for detection of small targets. This process for estimating background and threshold parameters is explained along with discussions of performance evaluations and limitations.

关键词： Digital signal processing Staring arrays Infrared imaging Signal processing Imaging systems Target detection Sensors Image processing algorithm development Infrared sensors

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