Digital Commons Network^™

Iddap -- Interactive Computer Assistance For Creative Digital Design, Richard Franklin Crall

Doctoral Dissertations

"A new computer-aided design program to assist in the initial phases of logical design is described. The program, intended for use via an on-line remote terminal, will allow the designer to study and experiment with design alternatives during the initial creative design phases. An ALGOL-like language is used for specifying the system being designed. In addition to simulating the design, the program allows the user to perform on-line design changes, reorganize data and generate timing diagram information"--Abstract, page ii.

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 …

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 …

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/S_o, 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

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 …

A Study Of Microstrip Transmission Line Parameters Utilizing Image Theory, Joseph Louis Van Meter

Masters Theses

"This paper is a theoretical investigation of the potential, electric field, capacitance, and characteristic impedance of the open strip transmission line or microstrip configuration based upon the classical Thomson Image Technique. It provides the basis for determination of the charge distribution on the strip and reports impedance values which compare favorably both with experimental values and theoretical work in the current literature"--Abstract, page ii.

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.

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.

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 …

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

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 …

Simulation And Analysis Of A Second-Order System With An Added Finite Pole And/Or Zero, William Robert Bodwell

Electrical & Computer Engineering Theses & Dissertations

An original system whose transfer functions consist of two infinite zeros and two finite poles is modified by the addition of a finite pole and/or finite zero. Statespace techniques are used to obtain equations for simulating the transfer functions on both analog and digital computers. Sample cases were selected and simulated to demonstrate the various types of responses. Analysis of the computer results and mathematical analysis of the transfer functions provide nomographs for estimating the response of the systems to a step-input and methods for obtaining equivalent pole/zero configurations.

Concepts In Lsi Servo-Control-Electronics, Alfons Alfred Tuszynski

Dissertations

This thesis deals with the engineering aspects of control electronics. It examines modern concepts of servo-control theory in the light of recent developments in the technology of monolithic circuits. Applicational considerations are slanted towards Aerospace standards of reliability and power-consumption economy.

Conclusions drawn from the discussion of fabrication constraints and performance requirements lead to a preference for digital implementations. Yield problems on one hand and aging effects on the other greatly reduce the feasibility rating of analog arrays.

Current practice in servo-control electronics revolves around purely analog implementations, sampled-data systems and Primitive on-off arrangements. The motivation behind the status quo …

A Method For Plotting Isohyetal Maps Using An Analog Computer, Maurice George Kirwan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The ability of the analog computer to stimulate physical phenomena is used in conjunction with a resistance paper model of the Walnut Gulch watershed in Arizona to plot constant precipitation maps from data obtained from recorded rainfall. Voltages which are proportional to rainfall at a specific raingage, located at scaled points of the resistance paper model, set up an electric field on the resistive sheet which is detected and processed by the computer. The detected potential is compared to a reference potential, or "precipitation value", and the necessary analog networks allow plotting of the equipotential line which is directly analogous …

A Study Of Thin-Film Superconducting Junctions, William P. Korink

Electrical & Computer Engineering Theses & Dissertations

The information presented in this paper is the result of research conducted toward the development. of a reproducible thin-film superconducting junction. The results of this experimentation and the equipment and procedures used are provided.

A qualitative explanation is given for the theory used in the derivation of the volt-ampere characteristics of thin-film superconducting junctions of metal-insulator- metal construction. This explanation entails the electron flow through the insulating layer through the use of the Fermi-Dirac and density of states functions.

The theoretical investigation is based on the BCS Theory and results in volt-ampere characteristics that agree very well with published experimental …

The Design Of Three-Port Strip Line Circulator, Jeng Seng Chang

Masters Theses

"This dissertation is concerned with the analysis and design of the radius of ferrite disk of strip line circulator using a generalized analytical field expression. The first part consists of an analysis of the field in the ferrite disk with the TEM wave incident normally on the air-ferrite boundary. It is approximated by taking the boundary condition at the incident and outlet points, so that analytical expressions for the electric and magnetic fields can be obtained. The next part consists of an approximate method to determine the radius of the ferrite disk based on the result obtained in the first …

Microwave Propagation Through Isotropic Inhomogeneous Photoconductive Media, Thomas Van Doren

Doctoral Dissertations

"The electromagnetic field equations for microwave propagation through a rectangular waveguide filled with a lossy, isotropic, linear, inhomogeneous material are derived in matrix form and solved numerically by computer. The theoretical effects of photo-induced conductivity and dielectric constant variations on microwave attenuation, phase shift, and voltage standing wave ratio are plotted for typical examples in the X-band frequency range. The theoretical calculations indicate that a two order-of-magnitude change in the conductivity can produce a 25 db change in the attenuation or a 100 degree change in the angle of the reflection coefficient. The theoretical predictions are verified qualitatively by experiments …

Computer-Aided Design Of Lossless Non-Uniform Transmission Lines, Larry Lee Wesner

Masters Theses

"A numerical iterative design technique is presented for the synthesis of lossless non-uniform transmission lines. A variational approach is used to minimize an error functional to which the system and boundary equality constraints have been adjoined by Lagrangian multipliers. The resultant network optimization conditions lead to an iterative scheme requiring analysis of the non-uniform line, analysis of an adjoint system and calculation of the error gradient in parameter space. A steepest descent procedure is used to optimize parameter values. Finite difference equations are used to provide an approximation model for implementation on the digital computer. A design example and a …

Current Characteristics Of Electrically Sprayed Glycerine, Larry Eugene Stoddard

Masters Theses

"The current carried by electrically-sprayed glycerine was measured, and an empirical relation was obtained for single-jet spraying, given by I = K_IV^0.45M^0.55̇d^-0.18 where V is the electrode voltage, Ṁ the mass-flow rate, and d the electrode spacing, the electrodes being a capillary and collecting plate. Peculiarities of the current waveform, including an exponentially rising envelope, for unstable-jet spraying and multiple-jet spraying, were recorded"--Abstract, page ii.

Investigation Of Target Detection In Noncoherent Systems With Colored Noise, Edward Windsor Bailey

Masters Theses

"Design efforts concerning the problem of detecting moving ground targets from an airborne platform with a noncoherent radar have been concentrated in the area of video filter design. The filter formulation generally follows an empirical path with no generally acceptable criterion for an optimum processor. This Thesis considers several problem formulations which are based on a Neyman-Pearson detection criteria. A square-law second detector is assumed and the resulting likelihood ratio shown to be too complex for closed form solution. The problem is reformulated in terms of sequences using complex random variable representations and the likelihood ratio is investigated. A test …

Failure Analysis Of Binary Address Decoders, Kanaiyalal Jekisondas Gandhi

Masters Theses

"This paper describes the organization and failure analysis of various types of binary address decoders. Logical type faults are considered and all possible faulty output patterns, resulting from these faults, are derived. A basic theory is developed, showing that these failure patterns are independent of the decoder size and organization. Digital simulation programs were used as an aid in the development of this theory. Results of the simulation are provided in the appendix"--Abstract, page ii.

Fault Diagnosis Of Sequential Circuits, Virgil Willis Hughes

Masters Theses

"Compared to the problem of combinational network (CN) diagnosis, that of sequential network (SN) diagnosis has been an extremely difficult one. Present techniques of SN diagnosis are difficult to apply, and generally lead to lengthy test schedules or additional logic. This paper presents a new approach to the SN diagnostic problem which results in a substantially simpler technique than those found in the literature. The approach is to modify the SN so that it can be diagnosed from a combinatoric point of view. This is accomplished by the addition of outputs for testing purposes to certain lines in the circuit--no …

Neutron Induced Changes To The Modified Ebers-Moll Transistor Model Used In The Net-1 Program, Kenneth Robert Smith

Masters Theses

"The development of theoretical and empirical relations which predict the permanent changes to the electrical characteristics of silicon transistors is described in this paper. Analytical techniques are also developed to obtain the parameters used in the Modified Ebers-Moll transistor model. The method employed is to determine the effects on externally measurable characteristics and to relate these changes to the parameters in the Modified Ebers-Moll transistor model. Further, all nonlinear characteristics are related to the independent variables with interpolating polynomials and degraded characteristics presented. then degraded characteristics are used to establish the parameters for and parameter changes to the transistor model …

Stochastic Simulations Analysis And Determination Of Iteration Requirements, James Walter Smith

Masters Theses

"A thorough analysis of computerized stochastic simulation problems has been undertaken to determine the number of iterations (or random draws) necessary to achieve a required degree of output accuracy. The basic problem is to determine when the sampled output mean and standard deviation are within specified accuracy limits. An error analysis is made of the statistical properties of deterministic-probablistic [sic] and logic (random walk) type problems. A recommendation for determining the number of problem iterations required is then presented"--Abstract, page ii.

A Method For Determining Transient Stability In Power Systems, Charles A. Gross

Doctoral Dissertations

"Given a three phase ac power system consisting of synchronous alternators interconnected by transmission lines and other items of electrical transmission equipment, a method is presented which determines the stability of the system when subjected to a three phase symmetrical fault, and to the subsequent clearing of the fault. It is inherent in the method that an estimation of system stability, assuming an instantaneous clearing of the fault, is available. The critical clearing time is therefore determined. The effect of a speed control loop on the system's largest machine is investigated. The method is applied to two, three, four, and …

Analysis Of The Traveling-Wave Transistor, Vernon Ray Stanley

Doctoral Dissertations

"Transmission lines containing independent and dependent distributed sources are considered and the transfer matrices of various active distributed lines are derived. A method is discussed by which a lossy line can be made lossless by the appropriate choice of distributed sources. A steady-state analysis of the uniform traveling wave transistor is given. Considering the device as an active four port network, the transfer matrix is found in closed form and the power gain, output voltage, and input impedance are found. A computer program is written and the frequency response is given for various values of line parameters and terminations. Finally, …

Models For The Pn Diode And The Npn And Pnp Transistor For Use In Computer Aided Design And Analysis Programs, Glenn Ronald Case

Doctoral Dissertations

"This work is concerned with the problem of developing suitable mathematical representations for the pn junction diode and npn and pnp transistors for use in computer aided design and analysis programs. The Ebers-Moll model as used in the Net-1 program has been considerably improved, particularly regarding base resistance prediction, prediction of high forward current behavior, and the addition of reverse breakdown terms. The resulting models show substantial improvement in representation of d-c and transient characteristics. Some improvement in a-c characteristics has also been obtained. Methods of obtaining parameters for the new model and several of the present models, given measured …

Signal Distortion In A Regenerative Frequency Divider, Carl Ray Ryan

Doctoral Dissertations

"A regenerative frequency divider can be constructed with one integrated circuit and a single-pole tuned circuit. The divider can be used as a means for reducing the modulation index of either deterministic or random signals. This reduction in modulation index can simplify many signal processing schemes. This technique can be used up to S-band frequencies. The mathematical model of the regenerative frequency divider corresponds very closely to that of a first order Phase Locked Loop (PLL). The loop gain is determined in part by the nonlinear element used in the feedback loop. The loop gain is also proportional to the …

An Analysis Of An Audio Amplifier Utilizing An Operational Amplifier And Negative Feedback, Anthony Francis Lexa

Masters Theses

"An audio amplifier utilizing a monolithic operational amplifier is analyzed. The analysis is a block diagram approach where the amplifier is divided into three parts; operational amplifier, power amplifier, and feedback network. A Fourier series analysis is used to describe the distortion and signal components of the amplifier output. The results of this analysis demonstrate the advantage of large negative feedback on frequency response and harmonic distortion. Using relatively few passive components a high quality audio amplifier is constructed with an output power of 15 watts RMS power and negligible harmonic distortion"--Abstract, page ii.

Tunnel Diode Models For Electronic Circuit Analysis Program (Ecap), Carmon Dale Thiems

Masters Theses

"In this paper ECAP models for the tunnel diode are presented. Results showing the model, the current-voltage charateristics [sic] are discussed. Operation in typical circuits is presented. A summary of the current state of the art in modeling appears in Appendix I. Since ECAP is only structured to accept piecewise-linear models of these devices, that type of model is presented here. All of the models are developed to approximate the typical tunnel diode current-voltage characteristic"--Introduction, page 1.