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Articles 1 - 30 of 36
Full-Text Articles in Engineering
A Simplification Heuristic For Large Flow Tables, R. J. Smith, James H. Tracey
A Simplification Heuristic For Large Flow Tables, R. J. Smith, James H. Tracey
Electrical and Computer Engineering Faculty Research & Creative Works
Flow tables specifying large asynchronous sequential circuits often contain more internal states than are required to specify desired circuit behavior. Known minimization techniques appear unsuited for reduction of such large (rows X columns > 250) flow tables, because of excessive computation and intermediate data requirements for problems of this size. The algorithm described here is intended to rapidly produce a simplified-but in general non-minimal-flow table. It is most economical when applied to extremely large tables and was devised primarily for automated design applications. The procedure has been programmed in PL/1 and has been incorporated into an asynchronous sequential circuit design automation …
Statistical Estimate Of Positional Error Inherent In Very Low Frequency Radio Navigation (Range-Range), Jimmie D. Mcginnis
Statistical Estimate Of Positional Error Inherent In Very Low Frequency Radio Navigation (Range-Range), Jimmie D. Mcginnis
Masters Theses
"To determine the effectiveness of Very Low Frequency (VLF) navigation in certain areas of the world, it is necessary that a method be developed to estimate the positional error associated with VLF relative positioning techniques. This paper presents a method which consists of a least-mean-squared procedure to sum up the errors contributed by each station being monitored. Since phase jitter (i.e., phase fluctuation) is a random variable, a statistical approach is employed to produce a one Σ ellipse centered about the true position. In short, this method defines the size and orientation of an area called an error ellipse which …
Etch Patterns On Zone-Refined Fe, M. E. Straumonis, Chang-Soo Kim
Etch Patterns On Zone-Refined Fe, M. E. Straumonis, Chang-Soo Kim
Electrical and Computer Engineering Faculty Research & Creative Works
Upon dissolution of zone-refined Fe in strong acids, mainly three kinds of corrosion patterns were observed in the crystallites of the sections. Regardless of the acids, the {110} plane always appeared on the three patterns in the form of smooth and even steps, ledges, or facets. The {112}, {122}, and {123} planes were also developed but to a much lesser degree. The {100} and {111} planes were not observed because grains of the respective orientation were missing on the sections. Attempts were made to explain the formation of the planes by taking into consideration the reticular density of the planes …
State Assignment Selection In Asynchronous Sequential Circuits, Gary K. Maki, James H. Tracey
State Assignment Selection In Asynchronous Sequential Circuits, Gary K. Maki, James H. Tracey
Electrical and Computer Engineering Faculty Research & Creative Works
Methods already exist for the construction of critical race-free assignments for asynchronous sequential circuits. Some of these methods permit the construction of many assignments for the same flow table. The algorithm presented here consists of two easy to apply tests which select that critical race-free assignment most likely to produce a set of simple next-state equations. The algorithm has been programmed. Copyright © 1970 by The Institute of Electrical and Electronics Engineers, Inc.
Baseband Agc In An Am-Fm Telemetry System, Richard S. Simpson, William H. Tranter
Baseband Agc In An Am-Fm Telemetry System, Richard S. Simpson, William H. Tranter
Electrical and Computer Engineering Faculty Research & Creative Works
The use of AGc loops at the input and output of the FM link in an AM-FM telemetry system allows the mean-square transmitter deviation to be maintained near maximum value, even though data may be nonstationary. However, errors result because of the inability of the receiver AGc loop to track perfectly gain variations in the transmitter loop. In this paper the general characteristics of AGc are discussed, and a theoretical analysis is performed to determine the time constant, steady-state error, and tracking error for a first-order loop. Also, tracking error for first order and second-order loops is investigated by simulation. …
Fault Detection In Asynchronous Sequential Circuits, Jeng-Chuan Kau
Fault Detection In Asynchronous Sequential Circuits, Jeng-Chuan Kau
Masters Theses
"As the asynchronous sequential circuit has become more and more important to digital systems in recent years high reliability and simple maintenance of the circuit is stressed. This paper presents a fault-detection algorithm which will be applicable to most of the practical asynchronous sequential circuits. The asynchronous sequential circuit is treated from the combinatoric point of view. First the minimal set of states, both stable states and unstable states, sufficient to detect all possible faults of the circuit is found from the fault table. Then a test sequence is generated to go through these states. It is assumed that testing …
On-Line Digital Computer Decoding Of Radio Teletype, Julio Alberto Spiegel
On-Line Digital Computer Decoding Of Radio Teletype, Julio Alberto Spiegel
Masters Theses
"Digital computer data processing is one of the newest and fastest growing technologies. The large amount of data that can be processed is practically beyond the limit of human possibilities when available time, cost and reliability of results are taken into consideration. The use of on-line digital computer data processing to decode Radio Teletype is investigated in this thesis. The first part of this thesis considers existing teletype systems and related systems, such as Pulse Code Modulation, pointing out the differences between synchronous and asynchronous codes. The most critical step in decoding Radio Teletype is synchronization, since Radio Teletype makes …
Electric Field Strength Dependence Of Surface Damage In Oxide Passivated Silicon Planar Transistors, C. A. Goben
Electric Field Strength Dependence Of Surface Damage In Oxide Passivated Silicon Planar Transistors, C. A. Goben
Electrical and Computer Engineering Faculty Research & Creative Works
A dependence of surface degradation induced by ionizing radiation in matched oxide-passivated silicon planar epitaxial transistors on junction fringing electric field strength present during exposure is reported. The electric field strength and gamma dose dependence are investigated of the decrease in the forward current gain, hFE (as reflected by the increase in the surface recombination current component), the increase in the surface recombination velocity (as reflected by the increase in the reciprocal of the minority carrier lifetime), and the increase in junction capacitance. Empirical prediction equations have been derived, for matched devices, correlating the normalized base current increase and the …
Nuclear Radiation Enhancement Of Transistor Forward Gain At High Frequencies, C. A. Goben, Y. P. Han
Nuclear Radiation Enhancement Of Transistor Forward Gain At High Frequencies, C. A. Goben, Y. P. Han
Electrical and Computer Engineering Faculty Research & Creative Works
This investigation has characterized the effects of fast neutron bombardment on a typical n-p-n transistor (2N914) of a common emitter amplifier operating at high-frequencies (>100 MHz) by means of s-parameter measurements from 120 MHz to 350 MHz, inclusive, every 10 MHz. The changes in the four (4) s-parameters and the trends and consequences of neutron bombardment are examined pictorially on graphs. The general effect of fast neutron bombardment is to decrease the magnitude of each s-parameter for frequencies below z. fT (where z = (O/1013)0.1). However, if the device is operating above z fT, the magnitudes of s11 (input …
A Digital Simulation For Optimum Nonlinear Detection Of Binary Signals In Impulsive Noise, Ralph Bernard Fluchel
A Digital Simulation For Optimum Nonlinear Detection Of Binary Signals In Impulsive Noise, Ralph Bernard Fluchel
Masters Theses
"The problem of reducing the effects of impulsive noise on binary communication systems is considered. A digital simulation of such a system is developed in order to find a nearly optimum (minimum probability of error criterion) nonlinear device to precede detection. The level of the Gaussian noise power is found to be the most important parameter for determining the nearly optimum nonlinear device"--Abstract, page ii.
The Effects Of Magnetic Fields Upon The Steady State And Short Circuit Performance Of Low Voltage Multi-Link Fuses, John Thomas Schultz
The Effects Of Magnetic Fields Upon The Steady State And Short Circuit Performance Of Low Voltage Multi-Link Fuses, John Thomas Schultz
Masters Theses
"The steady state and short circuit performance of multi-link fuses is investigated, as it is affected by the magnetic field of the nearby returning current and the current flowing in the fuse itself. The fuses investigated are low voltage (600 volts or less), multi-link fuses with ratings between 400 and 4000 amperes. The effects of the above mentioned magnetic fields upon the steady state current distribution within the fuse and upon the mechanical forces acting on the individual fuse links are calculated, while the effects of close proximity of the returning current upon short circuit fuse performance are shown by …
The Evaluation Of Radar Guided Missile Performance Using Various Target Glint Models, Franklin Delano Hockett
The Evaluation Of Radar Guided Missile Performance Using Various Target Glint Models, Franklin Delano Hockett
Masters Theses
"A radar guided missile seeker approaching a target arrives at a crossover point beyond which the entire target is illuminated by the missile seeker's radar antenna beam. When this occurs, for a complex target, the radar senses a time changing target center location which may greatly complicate the terminal tracking portion of the seeker's flight. This thesis documents various glint models in use today and compares the performance of these models by using a seeker model to determine the effect of glint on terminal tracking performance. A large volume of data has been compiled describing various radar characteristics of complex …
An Analysis Of A Quadrature Double-Sideband/Frequency Modulated Communication System, Denny Ray Townson
An Analysis Of A Quadrature Double-Sideband/Frequency Modulated Communication System, Denny Ray Townson
Masters Theses
"A QDSB/FM communication system is analyzed with emphasis placed on the QDSB demodulation process and the AGC action in the FM transmitter. The effect of noise in both the pilot and message signals is investigated. The detection gain and mean square error is calculated for the QDSB baseband demodulation process. The mean square error is also evaluated for the QDSB/FM system. The AGC circuit is simulated on a digital computer. Errors introduced into the AGC system are analyzed with emphasis placed on nonlinear gain functions for the voltage controlled amplifier"--Abstract, page ii.
Z-Form Solution Of Non-Linear Differential Equations, Allen Joseph Rushing
Z-Form Solution Of Non-Linear Differential Equations, Allen Joseph Rushing
Masters Theses
"The "Z-Forms" developed by Boxer and Thaler from Z-Transform theory are reviewed. Iteration is shown to increase accuracy when Z-Forms are used to obtain numerical solutions to some non-linear differential equations. Machine results are presented for example problems. Error estimates and convergence conditions are discussed. The method is usable only when 2- or 3-digit accuracy is acceptable. For some classes of equations the Z-Form method compares favorably to other numerical methods in time required to set up the problem and in machine time required for solution--Abstract, Page ii.
Fault Detection On Sequential Machines, Chung-Tao David Wang
Fault Detection On Sequential Machines, Chung-Tao David Wang
Masters Theses
"This paper presents an algorithm for deriving an optimum test sequence for detecting faults in a synchronous machine. In this study, the flow table is used as a tool to generate the fault detection tests. The fault stuck-at-1 (or stuck-at-0 ) is said to be present when a permanent signal valued 1 (or 0) appears on a component of the machine. Only single faults are treated . The result of the procedure is one or more test sequences guaranteed to detect a set of faults (Fp). First, sequential machines with feedback lines as memory elements are considered . …
An Explicit Simulation Of Overland Flow, Glendon Taylor Stevens
An Explicit Simulation Of Overland Flow, Glendon Taylor Stevens
Masters Theses
"Computer simulation of overland flow requires a mathematical model which converges to a true solution. This paper presents a method, based on measurable physical parameters, which insures convergence of a fixed grid explicit numerical solution. Analysis of a wide range of overland flow plane parameters has resulted in an equation of the form Δt = 0. 2 ΔX/So, for the time step increment. This equation provides values for Δt that will insure stability and convergence of the fixed grid explicit numerical method of solving the spatially varied unsteady flow equations. The effect of subarea shape on the rising …
Computerized Methods For Estimating Heating-Cooling-Ventilating System Usage In All-Electric Buildings, Carl William Glaser
Computerized Methods For Estimating Heating-Cooling-Ventilating System Usage In All-Electric Buildings, Carl William Glaser
Masters Theses
"This thesis develops a method and a resulting computer program for estimating the energy input required by the heating-cooling-ventilating system of a building. The computer program has the ability to model the ventilating system and all the inefficiencies introduced when the heating system is allowed to fight the cooling system to provide temperature control within the conditioned space. The program also can consider mechanical heat reclaim accurately, making the consideration on a time of need versus a time of occurrence basis. The program is written to utilize input data in rather simplified form. This allows the program to be used …
Digital Simulation Of A Signal Conditioner/Bit Synchronizer, Quentin Reed Webb
Digital Simulation Of A Signal Conditioner/Bit Synchronizer, Quentin Reed Webb
Masters Theses
"A bit rate filter type signal conditioner/bit synchronizer used in a split-phase PCM system is modeled digitally in three stages to determine overall system performance. General computer algorithms are developed to approximate independent operation of each major segment within the device. Bit rate effects and signal time-base error are investigated yielding the characteristic G-curves for the phase detector. These characteristics facilitate subsequent analysis of a linear equivalent digital-data-transition tracking phase-locked loop under several typical time-base error input conditions. Using bit error probabilities as performance criteria, the conditioner/synchronizer is found to perform adequately at signal-to-noise ratios exceeding +10dB. For inputs below …
Digital Simulation Of A Costas Loop Demodulator In Gaussian Noise And Cw Interference, Ajay Mugatlal Mehta
Digital Simulation Of A Costas Loop Demodulator In Gaussian Noise And Cw Interference, Ajay Mugatlal Mehta
Masters Theses
"A digital computer model of a Costas loop has been employed to study the effects of Gaussian noise and continuous-wave interference on the detection of biphase modulated signals. The dependence of bit-error probability, mean-square error between input and output, phase-error variance and threshold on signal-to-Gaussian-noise power ratio, interference-to-Gaussian-noise power ratio and frequency offset of the interference have been investigated and compared with previously obtained experimental results. The model has been verified for its accuracy in the case of no noise and when Gaussian noise is present at its input"--Abstract, Page ii.
Model-Referenced Adaptive Control Of Plants With Noise And Inaccessible State Vector, Donald James Schooley
Model-Referenced Adaptive Control Of Plants With Noise And Inaccessible State Vector, Donald James Schooley
Doctoral Dissertations
"The problems of process noise, measurement noise, and inaccessible process state vector in the model-referenced system of Shackcloth-Butchart-Parks (SBP) are investigated. Since the system no longer possesses a static equilibrium point, the concept of asymptotic stability does not apply. However, by using Liapunov-like ideas, the error between the plant (process plus controller) and the model is shown to enter a region about the origin if certain bounds are known. A possible technique for reducing the size of this region is to feedback a function of the error into the plant's input. Several methods of circumventing the inaccessible state vector problem …
Next-State Equation Generation For Asynchronous Sequential Circuits - Normal Mode, Gregory Martin Bednar
Next-State Equation Generation For Asynchronous Sequential Circuits - Normal Mode, Gregory Martin Bednar
Masters Theses
"This paper describes the known methods of generating next-state equations for asynchronous sequential circuits operating in normal fundamental mode. First, the methods that have been previously developed by other authors are explained and correlated in a simple and uniform language in order that the subtle differences of these approaches can be seen. This review is then followed by a development of a new method for generating minimal next-state equations which has some advantages over the previous methods. From the comparison of the previous known methods, it is noted that any one of these methods may be desirable for certain designs …
The Dinary Numerical System And Its Applications To Modern Parallel Processing Computers, Hai Chi Koo
The Dinary Numerical System And Its Applications To Modern Parallel Processing Computers, Hai Chi Koo
Masters Theses
"The Dinary Numerical System (DNS) is an extension of Binary Numerical System. By utilizing the newly developed Large-Scale-Integration technology, DNS can be implemented as a new concept of computer organization which has the merits of parallel processing. DNS consists of three field elements: they are -1, 0, and +1. Since DNS representation is not necessarily unique, new algorithms to generate the number of representations and all equivalent representations are presented in this paper. A Block-Oriented-Computer (BOC) is developed as an array of computing systems. For each of the systems, the arithmetic unit is essentially a modified Digital Differential Analyzer. The …
Computer-Controlled Processing Of Radar Precipitation Signals And Lightning Data, Gary Wayne Neal
Computer-Controlled Processing Of Radar Precipitation Signals And Lightning Data, Gary Wayne Neal
Masters Theses
"A system for the simultaneous processing of radar precipitation signals and lightning stroke location data has been designed. The system is to be used for the purpose of determining spatial and temporal correlations of lightning and thunderstorm precipitation. This system has been developed to gain further information about the cause-effect relationship between lightning stroke activity and thunderstorm precipitation. Data acquisition and processing is accomplished through the use of an AN/FPS-18 radar set, an SCC-650 digital computer system, a radar interface, and a set of lightning detectors. The radar set provides information on precipitation activity in a circle of radius fifty …
An Approximate Min-Max Solution To The Identification Problem, Richard Loyd Warren
An Approximate Min-Max Solution To The Identification Problem, Richard Loyd Warren
Masters Theses
"A technique based on the min-max error criterion is proposed for identifying a dynamic system in terms of a discrete-time model from the system response to a deterministic input. A linear, single-input/single-output, lumped-parameter, time-invariant (at least during the measurement interval) system is assumed. Although the resulting problem is non-linear, it is shown that linear programming techniques are applicable if a realistic approximation is made. The technique is implemented on the digital computer and evaluated by considering a number of typical discrete-time systems. The effects of additive noise are also considered"--Abstract, page ii.
Neutron Dependence Of Neutral Base Region Recombination, J. Bereisa, C. A. Goben
Neutron Dependence Of Neutral Base Region Recombination, J. Bereisa, C. A. Goben
Electrical and Computer Engineering Faculty Research & Creative Works
A discrete, deterministic mathematical model has been developed for the bulk base region of graded base devices that accounts for both the effects of neutron-induced recombination and built-in electric field in the base region at low, intermediate, and moderate current/injection levels. Exact expressions are developed for the bulk base recombination current and the collector current as functions of neutron fluence. Exact expressions are derived for the base recombination term and the relative rates of neutron-induced base current increase and collector current decrease. These expressions involve exponential and hyperbolic functions and are well suited for numerical computations and theoretical analysis. Damage …
An Analysis Of A Synchronization Scheme For 180° Biphase Modulated Signals, James Joseph Spence
An Analysis Of A Synchronization Scheme For 180° Biphase Modulated Signals, James Joseph Spence
Masters Theses
"The problem of analyzing a synchronization system for demodulation of 180° biphase modulated signals is considered in this thesis. The system considered utilizes the so-called squaring loop technique. Techniques derived from the theory of Markov processes are utilized in the analysis of the system. In particular the "fluctuation equation" approach for non-Markovian processes is used. After the analysis of the system is performed, an expression fro the bit error probability is obtained from knowledge of the phase error density function"--Abstract, Page ii.
Re-Design Of Cloud Chamber Instrumentation, Stanley Forrest Vaninger
Re-Design Of Cloud Chamber Instrumentation, Stanley Forrest Vaninger
Masters Theses
"Instrumentation and a new valving system is designed and built for use with an expansion type cloud chamber. Digital equipment is used for timing to improve reliability, accuracy, and flexibility, and a servo system is built using a lead compensator circuit which improves the servo system typically used with cloud chambers. Special care was taken to eliminate the sources of noise that appear in the amplified signal from the pressure transducer. The equipment needed to measure, record, and calibrate the pressure inside the chamber is built"--Abstract, page ii.
Excitation Requirement For Rectified Output Ac Generators, Richard Thomas Smith
Excitation Requirement For Rectified Output Ac Generators, Richard Thomas Smith
Electrical and Computer Engineering Faculty Research & Creative Works
This paper develops a method for calculating the required dc field current of a three-phase synchronous ac generator for known dc load conditions and machine characteristics. The method is simple to apply and has shown good agreement with test data. The method is of utility for preliminary design and analysis of rectified output alternators, such as may be used in excitation systems of the largest ac generators, space vehicle power applications, or high-power industrial rectification. Copyright © 1971 by The Institute of Electrical and Electronics Engineers, Inc.
Integrating An Oscilloscope Into A General Purpose Automatic Test System, William Charles Bauer
Integrating An Oscilloscope Into A General Purpose Automatic Test System, William Charles Bauer
Masters Theses
"The General Purpose Automatic Test System was developed for the Air Force as a system to automatically test and fault isolate an electronic unit under test. The Test System is a building block concept and this paper developed the hardware and programming software necessary to integrate an oscilloscope into the system. A Tektronix Type 564 oscilloscope with a Tektronix Type 3A5 Programmable Amplifier and a Tektronix Type 3B5 Programmable Time Base was used. A prototype of the digital and analog interface between the Test System and the Tektronix System was built and demonstrated. The Oscilloscope Building Block displays waveforms only …
A Model For Predicting The Energizing Transients Of Station Capacitor Banks, Dennis Oliver Wiitanen
A Model For Predicting The Energizing Transients Of Station Capacitor Banks, Dennis Oliver Wiitanen
Doctoral Dissertations
"A model for predicting the transients associated with energizing ungrounded wye-connected station capacitor banks was developed. The model has the capability of simulating non-simultaneous operation of the breaker poles, pre-insertion resistors, and the presence of previously energized capacitor banks at the same station. To investigate various system representations, a computer solution of the transient response of an arbitrary network and the computer solution of the generalized Thevenin impedance of a complex network are presented. A simple power system is defined and used to investigate the modeling of various system components, using the computer solution methods. Simplification of the model due …