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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： P.M. Gregson Computer Vision and Image Processing Laboratory Department of Electrical Engineering Technical University of Nova Scotia Halifax NS Canada

An algorithm for detecting neural processes in serial optical sections for use in an automated three-dimensional neural reconstruction system is presented. This parsimonious, nonlinear, psychophysically motivated algorithm addresses the problems specific to neural element detection and localization, viz., images with minimal resolution, operators with small spatial supports, highly curved, filamentous features, large variation in feature intensity profile, poor signal-to-noise ratio, and determination of depth without stereo. One first finds the magnitude and orientation of the maximum intensity second directional derivative. A family of curves is locally fitted to these data, and the projections of the data on the curve family are found. If a pixel lies on a curve with sufficient total projection, it is labeled with the magnitude, orientation, curvature, spatial extent, and element displacement. Depth is interpolated from the spatial extent data for corresponding neighborhoods in three adjacent (in depth) images by using an approximation to the depth-dependent optical point spread function. Experimental results using photomicrographs of cat visual cortex are presented.< >

关键词： Image reconstruction computer vision Displays Spatial resolution Neural networks Nonlinear optics Optical interconnections Neurons Image processing Laboratories

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A path metric for sequential search and its application in edge linking

A path metric for sequential search and its application in e...

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IEEE International Conference on Systems, Man and Cybernetics

作者： A.A. Farag E.J. Delp Engineering Mathematics & Computer Science Department Speed Scientific School University of Louisville Louisville KY USA Computer Vision & Image Processing Laboratory School of Electrical Engineering Purdue University West Lafayette IN USA

The authors develop a path metric for sequential search based on the linear model. The metric forms the heart of an edge-linking algorithm that combines edge elements enhanced by an optimal filter. From a starting node, transitions are made to the goal nodes by a maximum likelihood metric. This metric requires only local calculations on the search space and its use in edge linking provides more accurate results than other linking techniques.< >

关键词： Joining processes Image edge detection Filters Application software Heart Layout Decoding Mathematics computer science computer vision

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Patterning tungsten films with an electron beam lithography system at 50 keV for x‐ray mask applications

Journal of Vacuum Science & Technology B: Microelectronics a...

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Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures processing, Measurement, and Phenomena 1991年第6期9卷 3292-3296页

作者： K. W. Rhee A. C. Ting L. M. Shirey K. W. Foster J. M. Andrews M. C. Peckerar Y.‐C. Ku Nanoelectronics Processing Facility Electronics Science and Technology Division Naval Research Laboratory Washington DC 20375 Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02139

The application of electron beam lithography for the fabrication of x‐ray masks is essential in the development of x‐ray lithography technology. In this paper we present experimental results on the patterning of submicron (2–0.25 μm) features into a single‐layer negative e‐beam resist and then subsequent transfer of these patterns onto a 0.4 μm‐thick tungsten film by reactive ion etching. To study the dependence of the proximity effect on the substrate material, a comparison of linewidths and sidewall profiles of electron beam resist images on silicon, silicon dioxide on silicon, and tungsten on silicon wafers has been established.

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Active Gravity Gradient Torque Control for Earth-Orbiting Astronomical Telescopes

Active Gravity Gradient Torque Control for Earth-Orbiting As...

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American Control Conference (ACC)

作者： A. G. Emslie J. Zhu Department of Physics University of Alabama Huntsville AL USA Electrical and Computer Engineering Department Remote Sensing and Image Processing Laboratory Louisiana State University Baton Rouge LA USA

The controlled pointing of an Earth-orbiting astronomical telescope in the presence of time-dependent gravity-gradient torques is studied using recent techniques for the analysis and synthesis of time-varying linear scalar dynamical systems. We present results which show that effective adaptive control of unstable motions due to gravity gradient torques can be accomplished, resulting in high pointing accuracy and stability for astronomical telescopes in both circular and elliptical orbits.

关键词： Gravity Torque control Telescopes Satellites Earth Motion control Orbits Physics computing Remote sensing Image processing

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Design of a system for software testing and debugging for multiprocessor avionics systems

Design of a system for software testing and debugging for mu...

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IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： J.E. Lumpp R.K. Shultz T.L. Casavant Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA Advanced Technology and Engineering Collins Commercial Avionics Rockwell International Corporation Cedar Rapids IA USA

As multiprocessor software solutions find their way into critical applications such as avionics as a means of increasing performance and reliability, the need for both debugging and testing tools increases dramatically. The authors focus on the gathering of accurate run-time information providing support for both debugging and testing of embedded multiprocessor systems by using run-time identification of simple events and postexecution identification of compound events. Additionally, they propose a way of combining specification-based (black-box) system testing and automatic monitoring to substantially reduce the complexity, tedium, and cost of complete structural (white-box) testing.< >

关键词： Software testing System testing Software debugging Software performance Software tools Application software Aerospace electronics Runtime Multiprocessing systems computerized monitoring

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Efficient design and implementation of FIR filter banks with equal passband widths

Efficient design and implementation of FIR filter banks with...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： T. Saramaki J. Vidiscakova S.K. Mitra Signal Processing Laboratory Tampere University of Technology Tampere Finland Department of Electronics Slovak Technical University Bratislava Slovakia Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

An approach is presented for efficiently designing and implementing FIR (finite impulse response) filter banks with equal passband bandwidths. The overall bank of L filters is generated from a prototype 2Lth-band filter with the aid of a few additional coefficients and adders. The attractive properties of these filter banks are that the sum of filter outputs is guaranteed to be a pure delay and the passband bandwidths are the same for all the filters.< >

关键词： Finite impulse response filter Passband Filter bank Band pass filters Prototypes Stacking Channel bank filters Transfer functions Bandwidth Delay

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Reformulation of Chang's criterion for the absence of limit cycles using bilinear transform

Reformulation of Chang's criterion for the absence of limit ...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： T.C. Macedo T. Laakso P.S.R. Diniz I. Hartimo Department of Electrical Engineering Federal University of Rio de Janeiro (COPPE-EE) Rio de Janeiro Brazil Laboratory of Signal Processing and Computer Technology Helsinki University of Technology Espoo Finland

A procedure for the reformulation of Chang's criterion (1981) for the absence of zero-input limit cycles in recursive digital filters is presented. The technique employs the standard bilinear transform to convert a frequency-domain criterion into a polynomial form in terms of matrix transformations. The use of the method is illustrated with design examples applied to determine the stability region for certain single-quantizer recursive filter structures. The results can be utilized, e.g., in the design of an error feedback network for a given filter such that limit cycles are eliminated.< >

关键词： Limit-cycles Feedback Digital filters Stability criteria Paper technology Difference equations Frequency conversion Matrix converters Finite wordlength effects Adaptive filters

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Electronic Device Fabrication Using Electron Cyclotron Resonance Etching of Boron Doped Homoepitaxial Diamond Films

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MRS Online Proceedings Library 1991年第1期242卷 145-150页

作者： S. A. Grot R. A. Ditizio G. SH. Gildenblat A.R. Badzian S.J. Fonash Center for Electronic Materials and Processing The Penn State University University Park USA Department of Electrical and Computer Engineering The Penn State University University Park USA Department of Engineering Science and Mechanics The Penn State University University Park USA Materials Research Laboratory The Penn State University University Park USA

We describe the applicability of oxygen based Electron Cyclotron Resonance (ECR) etching of diamond for the purpose of fabricating electronic test structures and recessed gate field effect transistors. Boron doped homoepitaxial diamond films grown in a microwave assisted CVD reactor were used for this study. Etch rates from 8 nm/min up to 0.5 μm/min. were achieved depending on etch parameters.

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Co-scheduling compute-intensive tasks on a network of workstations: model and algorithms

Co-scheduling compute-intensive tasks on a network of workst...

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International Conference on Distributed Computing Systems

作者： M.J. Atallah C. Lock D.C. Marinescu H.J. Siegel T.L. Casavant Computer Sciences Department Purdue University West Lafayette IN USA Dept. of Comput. Sci. Purdue Univ. West Lafayette IN USA Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA

The problem of using the idle cycles of a number of high-performance workstations, interconnected by a high-speed network, for solving computationally intensive tasks is discussed. The classes of distributed applications examined require some form of synchronization among the sub-tasks, hence the need for coscheduling to guarantee that sub-tasks start at the same time and execute at the same pace on a group of workstations. A model of the system that allows the definition of an objective function to be maximized is presented. Then a quadratic time and linear space algorithm is derived for computing the optimal coscheduling.< >

关键词： computer networks Workstations High performance computing Processor scheduling Resource management Concurrent computing Intelligent networks Parallel processing Laboratories High-speed networks

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Real-time high-ratio image compression using adaptive VLSI neuroprocessors

Real-time high-ratio image compression using adaptive VLSI n...

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

作者： B.J. Sheu W.-C. Fang Department of Electrical Engineering Signal and Image Processing Institute University of Southern California Los Angeles CA USA Jet Propulsion Laboratory Advanced Computer Systems and Technology Section California Institute of Technology Pasadena CA USA

An adaptive VLSI neuroprocessor based on vector quantization algorithm has been developed for real-time high-ratio image compression applications. This VLSI neural-network-based vector quantization (NNVQ) module combines a fully parallel vector quantizer with a pipelined codebook generator for a broad area of data compression applications. The NNVQ module is capable of producing good-quality reconstructed data at high compression ratios more than 20. The vector quantizer chip has been designed, fabricated, and tested. It contains 64 inner-product neural units and a high-speed extendable winner-take-all block. This mixed-signal chip occupies a compact silicon area of 4.6*6.8 mm/sup 2/ in a 2.0- mu m scalable CMOS technology. The throughput rate of the 2- mu m NNVQ module is 2 million vectors per second and its equivalent computation power is 3.33 billion connections per second.< >

关键词： Image coding Very large scale integration Vector quantization Neural networks Data compression High performance computing Clustering algorithms Application software Image reconstruction CMOS technology

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