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Electrical and Computer Engineering Faculty Research & Creative Works

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Full-Text Articles in Engineering

Two-Dimensional Markov Representations Of Sampled Images, J. A. Stuller Jan 1976

Two-Dimensional Markov Representations Of Sampled Images, J. A. Stuller

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Shows that, under Certain Weak Restrictions, a Two-Dimensional Discrete Markov Process Can Be Represented Either "Causally" by a One-Sided Difference Equation, or "Non causally" by a Multiple-Sided Difference Equation. the Former Representation is Pertinent to the Analysis of Image Coders and Processors that Operate Sequentially on Scanned Image Data. the Latter Representation is Applicable to the Analysis of Block Coders and Processors. the General Relation between the Two Representations is Given and the Specialized Forms Resulting under Separable Scene Covariance Studied. Copyright © 1976 by the Institute of Electrical and Electronics Engineers. Inc.

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Hmo, A Hardware Microcode Optimizer, James O. Bondi, Paul D. Stigall Jan 1975

Hmo, A Hardware Microcode Optimizer, James O. Bondi, Paul D. Stigall

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Discusses an Algorithm for Optimizing the Density and Parallelism of Micro coded Routines in Micro programmable Machines. Besides the Algorithm itself, the Algorithm's Uses, Adaptability to Conventional Machine Characteristics, and Architectural Requirements Are Also Discussed and Analyzed. Even Though the Paper Proposes a Hardware Implementation of the Algorithm, the Algorithm is Viewed as an Integral Part of the Entire Microcode Generation and Usage Process, from Initial High-Level Input into a Software Microcode Compiler Down to Machine-Level Execution of the Resultant Microcode on the Host Machine. It is Believed that, by Removing Much of the Traditionally Time-Consuming and Machine-Dependent …

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Instruction Design To Minimize Program Size, James F. Wade, Paul D. Stigall Jan 1975

Instruction Design To Minimize Program Size, James F. Wade, Paul D. Stigall

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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Computer Modeling Of The Statistical Properties Of Transionospheric Scintillation Channels, W. F. Deckelman, Rodger E. Ziemer Jan 1975

Computer Modeling Of The Statistical Properties Of Transionospheric Scintillation Channels, W. F. Deckelman, Rodger E. Ziemer

Electrical and Computer Engineering Faculty Research & Creative Works

This concise paper shows that a bandlimited bivariate-normal time series is a useful model for the envelope of scintillating radio signals traversing the ionosphere. A software model is presented whose generated time series is compared to an actual block of scintillation data. A comparison of computer-generated and actual scintillation data shows that the fade-duration distribution of the simulated data fits that of the actual data closely through proper choice of model parameters. Copyright © by 1975 The Institute of Electrical and Electronics Engineers, Inc.

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Generalized Likelihood Signal Resolution, John A. Stuller Jan 1975

Generalized Likelihood Signal Resolution, John A. Stuller

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Defines an M-Ary Generalized Likelihood Ratio Test (MGLRT) that overcomes Root's Early Objection to the Application of Generalized Likelihood Ratio Testing to the Resolution of Correlated Signals. the Proposed Test Extends the Form of a Conventional Binary Generalized Likelihood Ratio Test (GLRT) in a Manner that Permits a Generalization of the Minimax Properties of the Binary Test to the M-Hypotheses Case. When the Estimated Signals Are Orthogonal, the Test Reduces to a Sequence of Conventional Binary Tests Duplicating the Performance of a Narrow-Band Matched Filter Envelope-Detector Receiver. © 1975, IEEE. All Rights Reserved.

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The Effective Autocorrelation Function Of Maximum Entropy Spectra, Richard E. Dubroff Jan 1975

The Effective Autocorrelation Function Of Maximum Entropy Spectra, Richard E. Dubroff

Electrical and Computer Engineering Faculty Research & Creative Works

The technique and the relative advantages of maximum entropy spectrum analysis have been discussed by Burg [1], [2]. Evaluation of the inverse Fourier transform of the maximum entropy spectrum shows that this method does, indeed, correspond to a reasonable nonzero extension of the autocorrelation function.

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Further Comments On “Two Counterexamples To Aizerman's Conjecture”, D. Ronald Fannin Jan 1975

Further Comments On “Two Counterexamples To Aizerman's Conjecture”, D. Ronald Fannin

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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A Computer-Automated Laboratory System In A University Environment, James H. Tracey, Hardy J. Pottinger, Richard D. Rechtien Jan 1975

A Computer-Automated Laboratory System In A University Environment, James H. Tracey, Hardy J. Pottinger, Richard D. Rechtien

Electrical and Computer Engineering Faculty Research & Creative Works

A computer-automated laboratory system at the University of Missouri-Rolla, Rolla, which serves a wide variety of instruction and research disciplines including Geophysics, Cloud Physics, and Computer Graphics, is described. The system serves as an example for campuses which are relatively small in geographic area and with budget limitations which dictate a step-by-step evolution. The paper describes 1) the constraints and economics realized in the development of the system, 2) the characteristics of the minicomputer network, and 3) an evaluation of the system philosophy and performance. Also included is a description of diverse laboratory projects supported by the computer-automated system. © …

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Verifications Of The Kalman Conjecture For Irrational Transfer Functions, D. Ronald Fannin, Charles E. Connelly Jan 1975

Verifications Of The Kalman Conjecture For Irrational Transfer Functions, D. Ronald Fannin, Charles E. Connelly

Electrical and Computer Engineering Faculty Research & Creative Works

The sufficient conditions for the Kalman conjecture to be satisfied given by Fannin and Rushing [1] are relaxed in such a way as to allow their approach to be applied to irrational transfer functions. Specific results for a class of systems containing transportation lag are presented. © 1975, IEEE. All rights reserved.

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Designing Hmo, An Integrated Hardware Microcode Optimizer, James O. Bondi, Paul D. Stigall Sep 1974

Designing Hmo, An Integrated Hardware Microcode Optimizer, James O. Bondi, Paul D. Stigall

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Discusses an Algorithm for Optimizing the Density and Parallelism of Micro coded Routines in Micro programmable Machines. Besides the Algorithm itself, the Algorithm's Uses, Design Integration Problems, Architectural Requirements, and Adaptability to Conventional Machine Characteristics Are Also Discussed and Analyzed. Even Though the Paper Proposes a Hardware Implementation of the Algorithm, the Algorithm is Viewed as an Integral Part of the Entire Microcode Generation and Usage Process, from Initial High-Level Input into a Software Microcode Compiler Down to Machine-Level Execution of the Resultant Microcode on the Host Machine. It is Believed that, by Removing Much of the Traditionally …

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Use Of A Micro-Computer In A Missile Simulator, James A. Rose, James V. Leonard, Herbert A. Crosby May 1974

Use Of A Micro-Computer In A Missile Simulator, James A. Rose, James V. Leonard, Herbert A. Crosby

Electrical and Computer Engineering Faculty Research & Creative Works

In 1971 McDonnell-Douglas was awarded a contract for a new missile system. The missile power, discrete command/ response, and digital systems were described with emphasis on the digital data format, error detection and timing. A missile simulator, the S/TS, was briefly described showing how the shortcomings of a previous simulator were eliminated. A listing of the S/TS design criteria was given, and the design logic based on utilization of a micro-computer was described.

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Hybrid Carrier And Modulation Tracking Loop Performance In Rfi, Rodger E. Ziemer, Donald R. Nelson Jan 1974

Hybrid Carrier And Modulation Tracking Loop Performance In Rfi, Rodger E. Ziemer, Donald R. Nelson

Electrical and Computer Engineering Faculty Research & Creative Works

The operation of a hybrid Tracking (HT) phase-locked loop (PLL) in radio-frequency interference (RFI) is considered. Results from a perturbation analysis for the loop phase error in continuous-wave (CW) RFI are found to compare favorably with results obtained by digital computer simulation. These results, together with simulation results for wide-band (in comparison to the loop bandwidth) RFI, indicate that loop structures which track both on the signal carrier and modulation components are advantageous in RFI plus Gaussian noise backgrounds. Copyright © 1974 by The Institute of Electrical and Electronics Engineers, Inc.

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Performance Comparison Of Techniques For Obtaining Stereo Radar Images, George L. Bair, Gordon E. Carlson Jan 1974

Performance Comparison Of Techniques For Obtaining Stereo Radar Images, George L. Bair, Gordon E. Carlson

Electrical and Computer Engineering Faculty Research & Creative Works

The performance of three stereo radar techniques is compared with respect to both theoretical performance and performance in the presence of errors. The three techniques are: an improved single flight technique, a previously proposed single flight technique, and a two flight technique. Theoretical data for comparison of image parameters affecting performance have been generated with computer simulations of the imaging geometries for the techniques. The comparison shows that the improved technique will have images with greater similarity resulting in improved stereo viewability and measurability. Computer simulations have also been used to generate sensitivities of computed terrain point coordinates to system …

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Verifications Of The Kalman Conjecture Based On Locus Curvature, D. Ronald Fannin, Allen J. Rushing Jan 1974

Verifications Of The Kalman Conjecture Based On Locus Curvature, D. Ronald Fannin, Allen J. Rushing

Electrical and Computer Engineering Faculty Research & Creative Works

The Kaiman conjecture is verified for certain transfer functions with only negative real poles and no numerator dynamics. The results are based on the off-axis circle criterion of Cho and Narendra and a consideration of the curvature of the Nyquist locus of the transfer function. Copyright © 1974, IEEE. All rights reserved.

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Equalization Of Qpsk Data Transmission In Specular Multipath, Rodger E. Ziemer, C. R. Ryan Jan 1974

Equalization Of Qpsk Data Transmission In Specular Multipath, Rodger E. Ziemer, C. R. Ryan

Electrical and Computer Engineering Faculty Research & Creative Works

This paper gives performance results for transversal-filter equalization of Quadri phase phase-shift-keyed (QPSK) signals with two-component multipath and demodulator phase error. An analytical expression for optimum, minimum mean-square-error tap weights in terms of the multipath and signal parameters is given. Probability of error results for no equalization and equalization with adaptive decision-feedback tap-weight adjustment are compared. The results show that significant improvement can be obtained with relatively simple equalizer structures. Copyright © 1974 by The Institute of Electrical and Electronics Engineers, Inc.

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An Asynchronous Circuit Design Language (Acdl), Gregory M. Bednar, James H. Tracey Jan 1974

An Asynchronous Circuit Design Language (Acdl), Gregory M. Bednar, James H. Tracey

Electrical and Computer Engineering Faculty Research & Creative Works

This correspondence describes a special purpose Asynchronous Circuit Design Language (ACDL) for specifying the terminal behavior of asynchronous sequential circuits. The language is a valuable tool for formalizing and documenting asynchronous designs, as well as providing a user interface to a completely automated synthesis system. The language includes many special features which permit quick and precise specification of terminal behavior and is best suited for problems that are currently being described informally by word statements. Copyright © 1974 by The Institute of Electrical and Electronics Engineers, Inc.

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A Review Of Directed Graphs As Applied To Computors, Paul D. Stigall, Ömür Tasar Jan 1974

A Review Of Directed Graphs As Applied To Computors, Paul D. Stigall, Ömür Tasar

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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Memory Utilization For A Dynamically Microprogrammed Computer, Paul D. Stigall Sep 1973

Memory Utilization For A Dynamically Microprogrammed Computer, Paul D. Stigall

Electrical and Computer Engineering Faculty Research & Creative Works

A Particular, Dynamically Microprogrammed Computer (Proposed by Tucker and Flynn in Commun. of ACM, April 1971) is Considered with Respect to Main Memory and Micro-Memory Utilization. a Dependency is Shown between Memory Utilization and Utilization of the Arithmetic and Logic Unit.

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Generalized Feedback Shift Register Pseudorandom Number Algorithm, Theodore Gyle Lewis, W. H. Payne Jul 1973

Generalized Feedback Shift Register Pseudorandom Number Algorithm, Theodore Gyle Lewis, W. H. Payne

Electrical and Computer Engineering Faculty Research & Creative Works

The generalized feedback shift register pseudorandom number algorithm has several advantages over all other pseudorandom number generators. These advantages are: (1) it produces multidimensional pseudorandom numbers; (2) it has an arbitrarily long period independent of the word size of the computer on which it is implemented; (3) it is faster than other pseudorandom number generators; (4) the "same" floating-point pseudorandom number sequence is obtained on any machine, that is, the high order mantissa bits of each pseudorandom number agree on all machines— examples are given for IBM 360, Sperry-Rand-Univac 1108, Control Data 6000, and Hewlett-Packard 2100 series computers; (5) it …

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Tilt-Table Alignment For Inertial-Platform Maintenance Without A Surveyed Site, Gordon E. Carlson, Max E. Bott Jan 1973

Tilt-Table Alignment For Inertial-Platform Maintenance Without A Surveyed Site, Gordon E. Carlson, Max E. Bott

Electrical and Computer Engineering Faculty Research & Creative Works

A method for aligning the rotary tilt table for an inertial-platform maintenance facility without surveying the site is analyzed and evaluated. The method utilizes multiple measurements of the tilt-table azimuth alignment error with different inertial platforms to determine a best estimate of the alignment error. Error analysis indicates that useful facility performance can be obtained with only a small number of measurements. The tilt-table alignment accuracy can be improved as more measurements of the alignment error are made during normal facility operation. © 1973, IEEE. All rights reserved.

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An Improved Single Flight Technique For Radar Stereo, Gordon E. Carlson Jan 1973

An Improved Single Flight Technique For Radar Stereo, Gordon E. Carlson

Electrical and Computer Engineering Faculty Research & Creative Works

An improved technique for obtaining stereo radar image pairs is described. The technique uses a unique combination of two different radar beam pattern characteristics. The resulting stereo radar images are illuminated from very nearly the same aircraft position which results in radar shadow and back-scatter characteristics which are very similar and in improved image registration possibilities. The reduction in illumination angle and aircraft position differences is shown to be nearly an order of magnitude or more when compared with a previously proposed single flight technique which used two vertical fan beam patterns at different azimuth angles. As a related sidelight …

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Performance Degradation Due To Specular Multipath Intersymbol Interference, G. H. Smith, David R. Cunningham, Rodger E. Ziemer Jan 1973

Performance Degradation Due To Specular Multipath Intersymbol Interference, G. H. Smith, David R. Cunningham, Rodger E. Ziemer

Electrical and Computer Engineering Faculty Research & Creative Works

Plots of performance degradation are used to compare the effects of fading and intersymbol interference in a two-component specular multipath digital communications channel. Similar plots are then used to compare two practical receivers designed to combat the interference. Degradation plots are shown to allow easy identification of each receiver's range of usefulness, as well as identification of variance bounds demanded of channel parameter estimates which the receivers require. Copyright © 1973 by The Institute of Electrical and Electronics Engineers, Inc.

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On The Method Of Stationary Phase, Byungkyu Park Jan 1973

On The Method Of Stationary Phase, Byungkyu Park

Electrical and Computer Engineering Faculty Research & Creative Works

The method of stationary phase (MSP), which is an asymptotic method of integration, nevertheless yields general (nonasymptotic) results when applied to certain integrals involving the spherical function. In such cases one may drop the requirement of far-field or high frequency from the results. Copyright © 1973 by The Institute of Electrical and Electronics Engineers. Inc.

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An Accurate Digital Instrument To Measure Reactor Period, Ernest W. Scott, Paul D. Stigall Jan 1973

An Accurate Digital Instrument To Measure Reactor Period, Ernest W. Scott, Paul D. Stigall

Electrical and Computer Engineering Faculty Research & Creative Works

At Facilities Having a Research-Training Reactor, such as the University of Missouri-Rolla Reactor (UMRR), One Finds It Necessary to Perform a Large Number of Rod Calibrations during the Course of the Year. in Practice Rod Worths Are Determined by Measuring the Reactor Period Created by an Incremental Withdrawal of the Rod under Calibration. Period is Then Related to Reactivity Thru the Use of a Publication Such as the AEC Publication, ID016485. This Frequent Measurement of Period Makes It Desirable to Have a Simple, Automatic and Accurate Method to Make Such Measurements. at UMRR We Have Designed, Constructed and Installed Such …

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Microprogramming For Probability Distribution Sampling, Theodore Gyle Lewis Aug 1972

Microprogramming For Probability Distribution Sampling, Theodore Gyle Lewis

Electrical and Computer Engineering Faculty Research & Creative Works

Microprogramming of special instructions for sampling of random variates from any probability distribution is a means of increasing sampling speed. The diversity of sampling techniques is narrowed to one general algorithm: conditional bit sampling. Conditional bit sampling uses a high-speed uniform random number generator based on feedback shift registers to sample one bit at a time. The probability of a bit being a one in the j-th position of a binary expanded variate is stored in a table of conditional probabilities. A comparison with the pseudorandom number yields a one or zero. The table of conditional probabilities is generated once …

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Reconstruction Of Finite Duration Signals, John A. Stuller Jan 1972

Reconstruction Of Finite Duration Signals, John A. Stuller

Electrical and Computer Engineering Faculty Research & Creative Works

The Problem of Reconstructing a Finite-Duration Finite- Energy Signal that Has Been Band Limited and Sampled is Considered. an Interpolation Formula is Derived that, in Principle, Permits Perfect Signal Reconstruction in the Noiseless Case Provided Only that the Sampling Frequency Exceeds the Cutoff Frequency of the Band-Limiting Filter. the Degradation Introduced by Measurement Noise on the Samples is Evaluated. © 1972, IEEE. All Rights Reserved.

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A State-Space Approach To Rlct Two-Port Transfer-Function Synthesis, Eddie R. Fowler, Rao Yarlagadda Jan 1972

A State-Space Approach To Rlct Two-Port Transfer-Function Synthesis, Eddie R. Fowler, Rao Yarlagadda

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents an interesting procedure for the synthesis of an RLCT two-part transfer function. An RLC ladder, consisting of n reactive elements and two resistors, is derived by using a tridiagonal matrix developed by Navot. The entries in this matrix are expressed in terms of the element values of the ladder network. Two voltage drivers are introduced into the ladder network to obtain a desired short-circuit transfer-admittance function numerator degree, using the classical theorems on transmission zeros. If the numerator degree of the transfer function is i (i < n), then, in general, (i) ladder networks need to be derived. The final network, corresponding to this transfer function, is obtained by paralleling the ladder networks (with transformers if necessary). Extensions to general short-circuit transfer admittance, open-circuit transfer impedance, and voltage transfer functions are briefly discussed. © 1972, IEEE. All rights reserved.

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Comments On “Accelerated Model-Reference Adaptation Via Lyapunov And Steepest Descent Design Techniques”, John S. Pazdera, Hugh F. Spewce Jan 1972

Comments On “Accelerated Model-Reference Adaptation Via Lyapunov And Steepest Descent Design Techniques”, John S. Pazdera, Hugh F. Spewce

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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Deriving Dc Machine Torque By The Principle Of Virtual Work, George Mcpherson Jan 1971

Deriving Dc Machine Torque By The Principle Of Virtual Work, George Mcpherson

Electrical and Computer Engineering Faculty Research & Creative Works

The purpose of this paper is to fill a gap which exists in the "textbook" theory of dc machines. The paper shows that the usual expression for dc machine torque can be obtained from the direct application of the principle of virtual work to the machine, making the traditional assumptions. The method provides additional benefits in that it demonstrates the reluctance torque which results from the saliency of the field structure and shows that compensating windings have no effect on the torque under the assumed linear conditions. Copyright © 1971 by The Institute of Electrical and Electronics Engineers, Inc.

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The Effect Of Channel Errors In The Differential Pulse-Code-Modulation Transmission Of Sampled Imagery, Roger J. Arguello, Harvey R. Sellner, John A. Stuller Jan 1971

The Effect Of Channel Errors In The Differential Pulse-Code-Modulation Transmission Of Sampled Imagery, Roger J. Arguello, Harvey R. Sellner, John A. Stuller

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Presents an Analysis, Simulation, and Discussion of the Effects of Communication Errors on Four-Bit Differential Pulse-Code Modulation (DPCM) Sampled Imagery. Simulations Are Presented that Describe the Effects of Inserting Periodic "PCM Updates" in Order to Correct Communication Errors in the DPCM Transmission of Photographic Scenes that Have Been Scanned and Sampled at the Nyquist Rate. Copyright © 1971 by the Institute of Electrical and Electronics Engineers, Inc.

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