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Electrical and Computer Engineering Faculty Research & Creative Works

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Full-Text Articles in Electrical and Computer Engineering

A Microcomputer-Based Data Acquisition System With Hardware Capabilities To Calculate A Fast Fourier Transform, R. A. Kobylinski, Rodger E. Ziemer, Paul D. Stigall Jan 1979

A Microcomputer-Based Data Acquisition System With Hardware Capabilities To Calculate A Fast Fourier Transform, R. A. Kobylinski, Rodger E. Ziemer, Paul D. Stigall

Electrical and Computer Engineering Faculty Research & Creative Works

The Fast Fourier Transform (FFT) Has in Recent Years Become an Important Tool to the Engineer. There Are a Number of Algorithms Which Calculate the FFT. One Such Algorithm is the Cooley-Tukey FFT Algorithm (Radix-2) Which Lends itself Rather Easily to a Combination Software and Hardware Implementation. with a Microcomputer as the Controller of a Data Acquisition Module and Hardware Which Computes the Butterfly Associated with the FFT Algorithm, the FFT Can Be Calculated Efficiently. © 1979 IEEE

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Toward More Meaningful Laboratory Experiences In Digital Signal Processing And Digital Control, Rodger E. Ziemer, D. Ronald Fannin, Paul D. Stigall Jan 1979

Toward More Meaningful Laboratory Experiences In Digital Signal Processing And Digital Control, Rodger E. Ziemer, D. Ronald Fannin, Paul D. Stigall

Electrical and Computer Engineering Faculty Research & Creative Works

Digital Signal Processing and Digital Control Are of Utmost Importance for Electrical Engineering Students, for They Are Present in Many Aspects of Today's Technical World. Complex Topics Like These Should Not Be Introduced into a Curriculum as a Crash Program but Taken as Steps in an Evolutionary Process. a Successful Example of This Evolutionary Process is Well Underway at the University of Missouri-Rolla. Copyright © 1979 by the Institute of Electrical and Electronics Engineers, Inc.

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Backscatter Inversion In Spherically Asymmetric Ionosphere, R. (Richard) E. Dubroff, N. Narayana Rao, K. C. Yeh Jan 1979

Backscatter Inversion In Spherically Asymmetric Ionosphere, R. (Richard) E. Dubroff, N. Narayana Rao, K. C. Yeh

Electrical and Computer Engineering Faculty Research & Creative Works

It is Well Known that Various Diurnal and Morphological Features of the Ionosphere Reveal Substantial Departures from the Normally Simplified Assumption of Spherical Symmetry at Certain Times of the Day or at Certain Geographic Locations. a Radio Ray Passing through Such an Ionosphere Must Bear Information About its Horizontal Gradients. the Leading Edge of a Backscatter Ionogram is Formed by Obliquely Propagated Radio Rays of Minimum Time Delay and Hence is Useful in Deducing Information About the Ionospheric Horizontal Gradients. in This Regard, the Ionospheric Electron Density Distribution is Modeled by a Locally Quasi‐parabolic Layer with Six Parameters. This Six‐parameter …

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Solar-Cell Design Based On A Distributed Diode Analysis, Jack L. Boone, Thomas P. Van Doren Jan 1978

Solar-Cell Design Based On A Distributed Diode Analysis, Jack L. Boone, Thomas P. Van Doren

Electrical and Computer Engineering Faculty Research & Creative Works

The front surface of a p-n junction solar cell has resistive losses associated with the diffused layer, the metal-semiconductor contact, and the grid structure. These losses are analyzed by considering the spatially distributed nature of the p-n junction and the grid conductors. This distributed diode analysis is especially useful for solar cells operated under concentrated sunlight conditions. The results show the dependence of the V-I characteristics and the maximum power output per unit cell on the ratio of the diffused layer resistance to the junction dynamic resistance. This ratio can assist the designer in establishing proper grid structure geometries and …

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Conference Tutorials-An Opportunity For Continuing Education, John H. Park, William H. Tranter Jan 1978

Conference Tutorials-An Opportunity For Continuing Education, John H. Park, William H. Tranter

Electrical and Computer Engineering Faculty Research & Creative Works

The Educational Services Committee of the IEEE Communications Society has sponsored eleven tutorial short courses at its major conferences over the past six years. The experience gained in developing and presenting these tutorials is shared with others so that they may be in a better position to sponsor similar continuing education activities in the future. The conference tutorial is one example of a continuing education activity that can be sponsored by an IEEE Group or Society as a service to its members. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.

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Electric Power Engineering Education National Trends, J. Derald Morgan Jan 1978

Electric Power Engineering Education National Trends, J. Derald Morgan

Electrical and Computer Engineering Faculty Research & Creative Works

At a time when energy issues are of great importance and the Power Industry has an increasing demand for the best young minds available to solve its problems, trends have developed that suggest possible future problems for Power Engineering Education. This paper reviews these national trends. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.

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The Development Of An Interactive Industry/Academic Power Engineering Education Program At The University Of Missouri-Rolla, Earl F. Richards, Max Darwin Anderson, Jack F. Morris, J. Derald Morgan, George Mcpherson, David R. Cunningham, Robert H. Nau, Edward Duke Tweed Jan 1978

The Development Of An Interactive Industry/Academic Power Engineering Education Program At The University Of Missouri-Rolla, Earl F. Richards, Max Darwin Anderson, Jack F. Morris, J. Derald Morgan, George Mcpherson, David R. Cunningham, Robert H. Nau, Edward Duke Tweed

Electrical and Computer Engineering Faculty Research & Creative Works

This paper describes the development of a unique andinno-vative program in power engineering education enhanced through an Industry/Academic interrelationship. This program is devoted to both the teaching and the practice of power engineering. The development of the Industry/Academic relationship and its value as a model for power engineering education are related. A summary of present and proposed future activities concludes the report. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.

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Vehicle Detection Using A Magnetic Field Sensor, Stanley V. Marshall Jan 1978

Vehicle Detection Using A Magnetic Field Sensor, Stanley V. Marshall

Electrical and Computer Engineering Faculty Research & Creative Works

The measurement of vehicle magnetic moments and the results from use of a fluxgate magnetic sensor to actuate a lighting system from the magnetic fields of passing vehicles is reported. A typical U.S. automobile has a magnetic moment of about 200 A-m2(Ampere-meters2), while for a school bus it is about 2000 A-m2. When the vehicle is modeled as an ideal magnetic dipole with a moment of 200 A-m2, the predicted results from an analysis of the sensor-vehicle geometry agree closely with observations of the system response to automobiles. Copyright © 1978 by The Institute of Electrical and Electronics Engineers. Inc.

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Data Compression In Microprocessor-Based Data Acquisition Systems, Paul D. Stigall, Philip Panagos Jan 1978

Data Compression In Microprocessor-Based Data Acquisition Systems, Paul D. Stigall, Philip Panagos

Electrical and Computer Engineering Faculty Research & Creative Works

A First-Order Predictor Routine and an Encoding Routine Were Implemented on an Intel-8080-Based Microprocessor System to Determine their Ability to Compress Seismic Data. the Predictor Routine Obtained a Maximum Compression Ratio of 2.33. It Appears that Higher Order Predictors Offer No Significant Advantage over the First-Order Predictor in Compressing Seismic Data. the Encoder Routine Obtained a Larger Compression Ratio of 3.94. the Accuracy of Reconstructed Seismic Traces is Bounded by a Maximum Average Error Per Point. for the Predictor, the Maximum Average Error Per Point is Shown to Be Equal to the Specified User Tolerance. for the Encoder, It is …

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Improving Qpsk Transmission In Band-Limited Channels With Interchannel Interference Through Equalization, S. H.R. Raghavan, Rodger E. Ziemer Jan 1977

Improving Qpsk Transmission In Band-Limited Channels With Interchannel Interference Through Equalization, S. H.R. Raghavan, Rodger E. Ziemer

Electrical and Computer Engineering Faculty Research & Creative Works

This paper describes the use of equalization in conjunction with channel filtering to improve QPSK transmission subject to both InterSymbol interference (ISI) and interchange interference (ICI). Performance bounds are computed using the nonclassical Gauss-quadrature rule (GQR) method. The signal-to-noise ratio (SNR) gain due to linear equalization over Non equalization is thereby obtained and presented. The performance of a linear equalizer thus obtained is compared with the Viterbi algorithm sequence estimator (VASE). In the absence of bounds for the VASE receiver under the channel conditions considered, simulation results are used to make the comparison. With a possible difference in the accuracies …

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Using An Inverter To Measure Magnetic Fields, Stanley V. Marshall Jan 1977

Using An Inverter To Measure Magnetic Fields, Stanley V. Marshall

Electrical and Computer Engineering Faculty Research & Creative Works

A toroidal core may be used with an inverter circuit to measure magnetic fields in the 0.8 to 80,000 A/m (.01 to 1.0 KOe) range. The sensor core may be the inverter transformer itself or may be coupled to a Non saturating inverter transformer. The sensor is most sensitive to fields parallel to the plane of the sensor and the sensitivity is greatest for a core biased to near saturation. An empirical expression for the demagnetization factor is used in calculating the ambient field required to saturate the sensor core, making it possible to calculate the range of fields for …

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Probability Of Anomaly Expressions For Random Waveform Registration, George L. Bair, Gordon E. Carlson Jan 1977

Probability Of Anomaly Expressions For Random Waveform Registration, George L. Bair, Gordon E. Carlson

Electrical and Computer Engineering Faculty Research & Creative Works

Registration by integral-square error correlation of one-dimensional Discrete Time waveforms which are treated as random processes with specified autocorrelation functions is considered. An important design parameter for this class of problems is the probability of anomaly (a false dip in the correlation function) because it gives an indication of system immunity to gross registration errors. Explicit expressions for this parameter are not possible, so bounds and approximations must be derived. Two upper bounds and an approximation for the probability of anomaly are derived here. The use of these expressions is illustrated by an example. The relative utility of these performance …

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Intraframe Sequential Picture Coding, John A. Stuller, Bernd Kurz Jan 1977

Intraframe Sequential Picture Coding, John A. Stuller, Bernd Kurz

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Generalizes Time-Discrete Autoregressive Source Coding Results of Rate-Distortion Theory to Two Dimensions. a 2-D Discrete Autoregressive Source is Defined and Shown to Produce a 2-D Wide-Sense Markovian Field. the Rate Distortion Function of the Source is Then Obtained under Assumption of Gaussian Field Statistics and a Squared Error Fidelity Criterion. a Procedure for Generating an Ensemble of 2-D Codewords Whose Statistics Satisfy the Variational Equations for R(D) is Given. These 2-D Codewords Are, by Space-Time Mappings, 1-D Tree Codes, and It is Noted that a Tree Coding Theorem of Jelinek, Berger, Davis and Hellman Applies. the Problem of …

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Signal Processing For The Multistate Myoelectric Channel, Philip A. Parker, John A. Stuller, R. N. Scott Jan 1977

Signal Processing For The Multistate Myoelectric Channel, Philip A. Parker, John A. Stuller, R. N. Scott

Electrical and Computer Engineering Faculty Research & Creative Works

In the Multistate Myoelectric Channel, a Single Myoelectric Signal Source is Used to Control a Multifunction Powered Prosthesis. the Selection of a Prosthesis Auction Requires a Receiver to Process the Myoelectric Signal, Contaminated with Noise, and to Decide on the Basis of the Received Signal Which Function is Desired. Thus, the Channel Dearly Presents a Problem of Choice of Receiver and of Decision Strategy. Previous Solutions to This Problem Have Been Basically Empirical. in This Paper We Seek the Optimum Receiver Where Optimum is in the Minimum Probability of Error Sense. First a Model is Developed for the Bipolar Myoelectric …

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The Attenuation Of Acoustic-Gravity Waves In A Slightly Dissipative Atmosphere, R. (Richard) E. Dubroff, K. C. Yeh, C. H. Liu Jan 1977

The Attenuation Of Acoustic-Gravity Waves In A Slightly Dissipative Atmosphere, R. (Richard) E. Dubroff, K. C. Yeh, C. H. Liu

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper is Concerned with Computation of the Attenuation Coefficient of Internal Acoustic-Gravity Waves in a Slightly Dissipative Horizontally Stratified Atmosphere. Two Models Are Generally Used in Deriving This Attenuation Coefficient. in One Model, the Nonlinear Hydrodynamic Equations Are Analyzed by using a Stokes Expansion and the WKB Solutions to the Linearized Perturbations Are Sought by using the Coupled Mode Formulation. in the Second Model, the Attenuation is Viewed as the Dissipation of Pseudo energy. We Show in This Paper that in a Slightly Dissipative Atmosphere, These Two Models Give Identical Results as Far as Computation of the Attenuation Coefficient …

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Detection In Image Dependent Noise, David R. Cunningham, Robert D. Laramore, Eamon Barrett Jan 1976

Detection In Image Dependent Noise, David R. Cunningham, Robert D. Laramore, Eamon Barrett

Electrical and Computer Engineering Faculty Research & Creative Works

The detection of two-dimensional optical signals which have been corrupted by noise is considered. Discussion is limited to the detection of a known object in a known location. The problem is approached from the classical statistical technique of hypothesis testing. Initially the solution is formulated in very general terms. The decision rule is derived for a signal distorted by noise of an unspecified type which may include signal dependent noise. Once the decision rule is obtained, the probabilities of false alarm and detection are evaluated from a priori knowledge of the noise and imaging system. The general results are applied …

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Comments On “A Counterexample To Harmonic Linearization”, D. Ronald Fannin Jan 1976

Comments On “A Counterexample To Harmonic Linearization”, D. Ronald Fannin

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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Horizon Profile Checkpoints For Low-Altitude Aircraft, Gordon E. Carlson, George L. Bair, Charles M. Benoit Jan 1976

Horizon Profile Checkpoints For Low-Altitude Aircraft, Gordon E. Carlson, George L. Bair, Charles M. Benoit

Electrical and Computer Engineering Faculty Research & Creative Works

A technique for utilizing on-board sensed horizon profiles and computer stored reference horizon profiles to provide navigation check points for low-altitude aircraft is described. The technique has been analyzed using digitized terrain data and computer simulations to select the best method of horizon profile comparison, to determine horizon data density requirements, and to provide performance comparisons, system error limitations, and tradeoffs. Results of these analyses are shown to support feasibility conclusions and system parameter tradeoffs. Copyright © 1976 by The Institute of Electrical and Electronics Engineers, Inc.

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Computer Analysis Of 3-Phase Induction Motor Operation On Rural Open-Delta Distribution Systems, Stephen C. Seematter, Earl F. Richards Jan 1976

Computer Analysis Of 3-Phase Induction Motor Operation On Rural Open-Delta Distribution Systems, Stephen C. Seematter, Earl F. Richards

Electrical and Computer Engineering Faculty Research & Creative Works

Open-delta/open-delta and open-wye/open-delta transformer banks are often used as an economic means of supplying simultaneous single-phase and 3-phase loads in rural areas. If the 3-phase load is an induction motor, the inherent voltage unbalance causes increased losses and uneven heating that may lead to motor failure. Often these motors are submersible or deep well pump motors located in remote unattended areas or air conditioning motors which may not have sufficient over-design to handle the voltage unbalance. The theory analyzing the open-delta distribution system has existed for many years, however, because of the tedious and almost infinite differences in distribution topology, …

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Kalman Filter Equalization For Qpsk Communications, T. S. Lee, David R. Cunningham Jan 1976

Kalman Filter Equalization For Qpsk Communications, T. S. Lee, David R. Cunningham

Electrical and Computer Engineering Faculty Research & Creative Works

The discrete complex Kalman filter is considered as an equalizer for quadrature phase-shift keyed (QPSK) systems in the presence of additive noise and InterSymbol interference (ISI). When the channel is unknown, an adaptive Kalman equalizer is used in which the channel complex tap gains are estimated by decision feedback. Copyright © 1976 by The Institute of Electrical and Electronics Engineers, Inc.

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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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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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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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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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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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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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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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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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