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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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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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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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A real-time VLSI neuroprocessor for adaptive image compression based upon frequency-sensitive competitive learning

A real-time VLSI neuroprocessor for adaptive image compressi...

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International Joint Conference on Neural Networks (IJCNN)

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

The frequency-sensitive competitive learning (FSCL) algorithm and its associated VLSI neuroprocessor have been developed for adaptive vector quantisation (AVQ). Simulation results show that the FSCL algorithm is capable of producing a good-quality codebook for AVQ at high compression ratios of more than 20 in real time. This VLSI neural-network-based vector quantization design includes a fully parallel vector quantizer and a pipelined codebook generator to provide an effective data compression scheme. It provides a computing capability as high as 3.33 billion connections per second. Its performance can achieve a speedup of 750 compared with SUN-3/60 and a compression ratio of 33 at a signal-to-noise ratio of 23.81 dB.< >

关键词： Very large scale integration Image coding Frequency Neural networks Power capacitors Vector quantization CMOS technology Image reconstruction Speech coding Data compression

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Neural networks for sidescan sonar automatic target detection

Neural networks for sidescan sonar automatic target detectio...

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IEEE Workshop on Neural Networks for Signal processing

作者： M.J. LeBlanc E. Manolakos Fault-Tolerant Systems Division The Charles Stark Draper Laboratory Inc. Cambridge MA USA Communications and Digital Signal Processing Center of Research and Graduate Studies Electrical & Computer Engineering Department Northeastern University Boston MA USA

The goal of this research is to develop a multi-layer feedforward neural network architecture which can distinguish targets (in this case, mines) from background clutter in sidescan sonar images. The network is to be implemented on a hardware neurocomputer currently in development at CSDL, with the goal of eventual real-time performance in the field. A variety of neural network architectures are developed, simulated, and evaluated in an attempt to find the best approach for this particular application. It has been found that classical statistical feature extraction is outperformed by a much less computationally expensive approach that simultaneously compresses and filters the raw data by taking a simple mean.< >

关键词： Neural networks Sonar detection Object detection Multi-layer neural network Feedforward neural networks Neural network hardware computer architecture Computational modeling Feature extraction Filters

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ON THE COMPLEXITY OF HYPERELLIPTIC DISCRETE LOGARITHM PROBLEM

ON THE COMPLEXITY OF HYPERELLIPTIC DISCRETE LOGARITHM PROBLE...

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WORKSHOP ON THE THEORY AND APPLICATION OF CRYPTOGRAPHIC TECHNIQUES

作者： SHIZUYA, H ITOH, T SAKURAI, K Department of Electrical Communications Faculity of Engineering Tohoku University Aramaki-Aza-Aoba Aoba-ku Sendai 980 Japan Département d’I.R.O. Université de Montréal C.P.6128 Succ.A Montréal H3C 3J7 QC Canada Department of Information Processing The Graduate School at Nagatsuta Tokyo Institute of Technology 4259 Nagatsuta Midori-ku Yokohama 227 Japan Computer & Information Systems Laboratory Mitsubishi Electric Corporation 5-1-1 Ofuna Kamakura 247 Japan

ISBN: (纸本)3540546200

We give a characterization for the intractability of hyperelliptic discrete logarithm problem from a viewpoint of computational complexity theory. It is shown that the language of which complexity is equivalent to that of the hyperelliptic discrete logarithm problem is in NP ∩ co-AM, and that especially for elliptic curves, the corresponding language is in NP ∩ co-NP. It should be noted here that the language of which complexity is equivalent to that of the discrete logarithm problem defined over the multiplicative group of a finite field is also characterized as in NP ∩ co-NP. © Springer-Verlag Berlin Heidelberg 1991.

关键词： Computational complexity

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