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A framework for compile-time selection of parallel modes in an SIMD/SPMD heterogeneous environment 7

A framework for compile-time selection of parallel modes in ...

1993 Workshop on Heterogeneous processing, VVHP 1993, Held in conjunction with the 7th International Parallel processing Symposium

作者： Watson, Daniel W. Siegel, Howard Jay Antonio, John K. Nichols, Mark A. Atallah, Mikhail J. Parallel Processing Laboratory School of Electrical Engineering Purdue University West LafayetteIN47907 United States Computer Sciences Department Purdue University West LafayetteIN47907 United States NCR Corp. San DiegoCA United States

ISBN: (纸本)0818635312

A framework for estimating the relative execution time of a data-parallel algorithm in an environment capable of the SIMD and SPMD (Single Program - Multiple Data) modes of computation is presented. Given a data-parallel program in a language whose syntax is mode-independent, and empirical information about instruction execution time characteristics, the long-term goal is to determine at compile time an implementation that results in an optimal execution time for a heterogeneous system capable of SIMD and SPMD parallelism. © 1993 IEEE.

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Application of QR decomposition-based least squares technique to improve air traffic control radar

Application of QR decomposition-based least squares techniqu...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： T. Ogunfunmi Nam Ling Signal and Image Processing Laboratory (SIPL) Department of Electrical Engineering Santa Clara University Santa Clara CA USA Computer Systems and Parallel Processing Research Laboratory (CSPPRL) Department of Computer Engineering Santa Clara University Santa Clara CA USA

For real-time radar processing, it is very desirable to have an algorithm that does not assume restricted statistics of the input data and can be implemented for high-speed processing (without a high cost) to meet real-time requirements. We therefore apply the QR decomposition-based least-squares method for linear prediction to the problem of computing the reflection coefficients of a lattice predictor, instead of using the conventional Burg algorithm. We also propose a modified one-dimensional ring architecture for implementing the QR method of least-squares. The particular application considered in this case is that of surveillance radar systems for air traffic control.< >

关键词： Least squares methods Air traffic control Radar applications Signal processing algorithms Radar signal processing Statistics Systolic arrays Radar imaging Signal processing Surveillance

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A New Method for Evaluating Floquet Characteristic Exponents of Periodic Linear Systems

A New Method for Evaluating Floquet Characteristic Exponents...

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American Control Conference (ACC)

作者： J. Zhu S. K. Vemula Electrical and Computer Engineering Department Remote Sensing and Image Processing Laboratory Louisiana State University Baton Rouge LA USA Electrical and Computer Engineering Department Louisiana State University Baton Rouge LA USA

It is well-known that the stability of linear periodic (LP) systems can be assessed using Floquet Characteristic Exponents (FCE). In this paper, a new method is presented for evaluating FCE for nth-order scalar periodic linear systems based on a recently developed unified eigenvalue theory for linear time-varying (LTV) Systems [1]. The new theory allows FCEs to be evaluated from the DC term of the Fourier series of periodic PD-eigen-values of a LP system. Comparing to the well-known Monodromy Matrix (MM) method and Infinite Dimensional Determinant (IDD) method for evaluating FCE 1 the solutions obtained by the new method have rapid local convergence. This new method also allow stability boundaries in the parameter space of a LP system to be evaluated and plotted directly. The new results shed some light OL the general stability assessment problem for vector periodic linear systems and aperiodic LTV systems. Further studies along this direction are also discussed in this paper.

关键词： Linear systems Eigenvalues and eigenfunctions Vectors Fourier series Frequency Equations Stability analysis Remote sensing Image processing Laboratories

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Scanning tunneling microscope study of GaAs(001) surfaces grown by migration enhanced epitaxy

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 1993年第4期11卷 1370-1373页

作者： J. Kim M. C. Gallagher R. F. Willis Jianming Fu D. L. Miller The Department of Physics The Pennsylvania State University University Park Pennsylvania 16802 Electronic Materials and Processing Research Laboratory Department of Electrical and Computer Engineering The Pennsylvania State University University Park Pennsylvania 16802

We report an investigation of the morphology of p‐type GaAs(001) surfaces using scanning tunneling microscopy (STM). The substrates were prepared using two methods: migration enhanced epitaxy (MEE) and standard molecular‐beam epitaxy (MBE). The STM measurements were performed ex situ using As decapping. Analysis indicates that the overall step density of the MEE samples decreases as the growth temperature is increased. Nominally flat samples grown at 300 °C exhibited step densities of 10.5 steps/1000 Å along [110] dropping to 2.5 steps at 580 °C. MEE samples exhibited a lower step density than MBE samples. However as‐grown surfaces exhibited a larger distribution of step heights. Annealing the samples reduced the step height distribution exposing fewer atomic layers. Samples grown by MEE at 580 °C and annealed for 2 min displayed the lowest step density and the narrowest step height distribution. All samples displayed an anisotropic step density. We found a ratio of A‐type to B‐type steps of between 2 and 3 which directly reflects the difference in the incorporation energy at steps. The aspect ratio increased slightly with growth temperature. We found a similar aspect ratio on samples grown by MBE. This indicates that anisotropic growth during MEE, like MBE, is dominated by incorporation kinetics. MEE samples grown at 580 °C and capped immediately following growth exhibited a number of ‘‘holes’’ in the surface. The holes could be eliminated by annealing the surface prior to quenching.

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Local estimation of Gaussian-based edge enhancement filters using Fourier analysis

Local estimation of Gaussian-based edge enhancement filters ...

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1993 IEEE International Conference on Acoustics, Speech, and Signal processing

作者： B. Wang D.M. Rose 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

An empirical measure for the selection of the edge-enhancement Gaussian filter is developed. The Gaussian filter is specified by its standard deviation sigma ; the filter's spatial support is a function of sigma . An estimation procedure for sigma using Fourier analysis is described. The measure is easy to implement and is based totally on the image at hand. Experimental results suggest that this measure can be used as an aid in deciding the Gaussian filter's spatial support, which is needed to enhance the edges. Other equivalent bandwidth definitions can be used to obtain a measure of the frequency spread in the smoothed image (e.g., the mean-square bandwidth).< >

关键词： Gaussian processes Low pass filters Shape Filtering Frequency Mathematics computer science computer vision Image processing Image segmentation

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Critical performance path analysis, and efficient code generation issues, for the Seamless architecture

Critical performance path analysis, and efficient code gener...

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International Symposium on Parallel processing

作者： D.L. Bright S.A. Fineberg B.H. Pease M.L. Roderick S. Sundaram T.L. Casavant Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA Numerical Aerodynamic Simulation NASA Ames Research Center CA USA

An analytical study of potential pathological performance areas of the Seamless architecture is presented. Seamless is a latency-tolerant, distributed memory, multiprocessor architecture. A key component of the philosophy of Seamless, however, is the use of standard, commodity components for a large part of the system. A discussion of the unavoidable implementation compromises imposed by this decision is presented, followed by a summary of some optimistic performance studies. Then an analytical study that parameterizes the predicts the worst-case impact of using standard components is provided. Finally, it is shown that these bottlenecks are manageable via careful generation of target machine code so that the optimistic performance studies become realistic expectations for a range of program behaviors and granularities.< >

关键词： Performance analysis computer architecture Hardware Reduced instruction set computing Workstations Costs Aerodynamics Computational modeling Analytical models Numerical simulation

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Helicopter gearbox fault detection and diagnosis using analog neural networks

Helicopter gearbox fault detection and diagnosis using analo...

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Asilomar Conference on Signals, Systems & computers

作者： P.T. Monsen E.S. Manolakos M. Dzwonczyk Atlantic Aerospace Electronics Corporation Waltham MA USA Communications and Digital Signal Processing Center Electrical And Computer Engineering Department Northeastern University Boston MA USA Information Systems Laboratory Department of Electrical Engineering University of Stanford USA

This paper summarizes the results of two neural hardware implementations of a helicopter gearbox health monitoring system (HMS). Our first hybrid approach and implementation to fault diagnosis is outlined, and our results are summarized using three levels of fault characterization: fault detection (fault or no fault), classification (gear or bearing fault), and identification (fault sub-classes). Our second all-analog implementation exploits the ability, of analog neural hardware to compute the discrete Fourier transform (DFT) as a pre-processor to a neural classifier. Our hardware results compare well with previously published software simulations.< >

关键词： Helicopters Fault detection Fault diagnosis Hardware Discrete Fourier transforms Monitoring Gears Analog computers Computational modeling

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Metal–oxide–semiconductor characterization of silicon surfaces thermally oxidized after reactive ion etching and magnetically enhanced reactive ion etching

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 1993年第2期11卷 249-252页

作者： Kenneth T. Settlemyer, Jr. Jerzy Ruzyllo David K. Hwang Herbert J. Leary, Jr. Electronic Materials and Processing Research Laboratory Department of Electrical and Computer Engineering The Pennsylvania State University University Park Pennsylvania 16802 IBM General Technology Division East Fishkill Facility Hopewell Junction New York 12533

In this study the performance of reactive ion etching (RIE) and magnetically enhanced reactive ion etching (MERIE) processes in pregate oxidation etching of the field oxide are compared. The comparison is carried out through metal–oxide–semiconductor (MOS) characterization of oxides and interfaces formed on etched silicon surfaces. The results revealed differences in the outcome of RIE and MERIE processes with the latter displaying overall superior characteristics. MERIE induced surface damage is shallower, and is mostly removed during oxide growth. RIE damage propagates deeper into the Si bulk and still influences the MOS devices even after the top Si layers are converted into the oxide. The results obtained emphasize the importance of adequate cleaning of silicon surfaces following RIE/MERIE processes.

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A Framework for Compile-Time Selection of Parallel Modes in an Simd/spmd Heterogeneous Environment

A Framework for Compile-Time Selection of Parallel Modes in ...

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Workshop on Heterogeneous processing

作者： D.W. Watson H.J. Siegel J.K. Antonio M.A. Nichols M.J. Atallah Parallel Processing Laboratory School of Electrical Engineering Purdue University West Lafayette IN USA NCR Corporation San Diego CA USA Computer Sciences Department Purdue University West Lafayette IN USA

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SPECIFICATION AND ANALYSIS OF PARALLEL DISTRIBUTED SOFTWARE AND SYSTEMS BY PETRI NETS WITH TRANSITION ENABLING FUNCTIONS

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IEEE TRANSACTIONS ON SOFTWARE engineering 1992年第3期18卷 252-261页

作者： PAPELIS, YE CASAVANT, TL Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa City IA 52242

This paper investigates a new approach for visually specifying parallel/distributed software using Petri Nets (PN's) extended with Transition Enabling Functions (TEF's). The approach is demonstrated to be useful in the specification of decision-making activities that control distributed computing systems. PN's are employed because of their highly visual nature that can give insight into the nature of the controller of such a system and because of their well-known analytical properties. In order to increase the expressive power of PN's, the extension of TEF's is used. The main focus of this paper is the specification and analysis of parallel/distributed software and systems. A key element of this approach is a set of rules derived to automatically transform such an extended net into a basic PN. Once the rules have been applied to transform the specification, well-known analytical methods can be used to investigate characteristic properties of the system and validate correct operation.

关键词： DISTRIBUTED SOFTWARE PARALLEL SOFTWARE SOFTWARE SPECIFICATION PARALLEL PETRI NETS TRANSITION ENABLING FUNCTIONS CONCURRENCY

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