Digital Commons Network^™

On The Application Of Bayesian Learning In Discrete Communication Systems., Chien Fong Chao

Electrical and Computer Engineering ETDs

It is the requirement of many communication systems that the transmission of information should not only be reliable, but also efficient with respect to the capacity of the communi­cation channel used.

Determining The Best Computational Method For Simulation, Neil Hertenstein

Masters Theses

"Two related problems are treated in the discussion. First, what is the best computational means to be used to simulate a given system? Second, if hybrid is chosen, how do we assign the problem to the different computers to realize the fullest advantage of the hybrid simulation? Most of the available information in the literature is presented in light of the above questions. It is found that, despite the lack of a precise theoretical solution, much insight can be gained into the problem. A proposed procedure for hybrid assignment and a sample problem using this procedure completes the discussion"--Abstract, page …

Analysis Of Time-Varying Linear Multipole Filters With Sampled Nonstationary Random Inputs, Ming-Chwan Chow

Masters Theses

"In this thesis an analytical method is developed to determine an optimum time-varying linear filter in order to satisfy the following specifications. The filters are of sampled data multipole form with n inputs and m outputs. The signal of each input is a member of a nonstationary random process, and the signal is corrupted by stationary noise.

The statistical optimization theory developed by Wiener is extended to a linear time- varying filter with nonstationary input. Correlation functions are defined for nonstationary ensembles. The mean- square error is calculated in terms of these correlation functions. By minimization of the mean-square error, …

A Probability Density Analyzer, Thomas K. Bohley

Masters Theses

"A means is presented by which the probability density of statistical signals may be determined experimentally. The design and construction of an electronic test instrument to measure probability density is discussed. Operating instructions and circuit diagrams are also included"--Abstract, page ii.

The Constant Impedance Tapered Lossless Transmission Line, Yu Kuo Chen

Masters Theses

"Considerable work has been done on the theory and development of the distributed RC network which is a special case of the general distributed network type of transmission line.

Sir William Thompson analyzed telegraph cables, assuming the RC line as a model. Oliver Heaviside made numerous contributions to transmission line theory. The solution of a two-wire transmission line with constant parameters R and C is obtainable by direct solution of the telegraphist's equations which are developed from the equivalent circuit of an incremental length of the network. The sinusoidal steady-state solutions of certain tapered RC lines have been exhibited. The …

A Periodic Dielectric Rod Antenna, Robert C. Peirson

Masters Theses

"The periodic dielectric rod antenna structure under consideration consists of identical dielectric rod sections of radius a meters situated on a common axis. These sections are of length 1₁ meters and are separated in free space by distance 1₂ meters.

Field analysis employing Floquet's theorem, in terms of the exemplary TM₀₁ circular mode, gives expressions for the various field components and an eigenvalue equation. Digital solution of this eigenvalue equation establishes the location of propagation bands as a function of frequency. Such bands are characteristic of any periodic wave guiding structure."--Abstract, page ii.

The Effect Of Non-Linearity On A Frequency-Modulated Wave, Tzu-Tien Hung

Masters Theses

"A method is presented for finding the effect of a nonlinear characteristic of a device on a wave which is frequency modulated by only one sinusoidal modulating wave. The distortion in the output has been found by passing a frequency-modulated wave (which is represented by a summation expression for the spectrum components) through a non-linear circuit having a Fourier series represention of its Characteristic. Two cases have been considered: (1) a nonlinear output-input characteristic, and (2) a non-linear amplitude-frequency characteristic"--Abstract, page ii.

Nonparametric Detection Of Signals Causing Arbitrary Changes In The Accompanying Noise Backgrounds, John Joseph Komo

Doctoral Dissertations

"The detection of signals in the presence of noise is an important problem in the field of communications. The detection problem is concerned with the design of systems which determine only the presence or absence of a signal which occurs with background noise. An example of considerable importance, which is encountered quite frequently in practice, is the radar detection problem. In the radar problem it is desired to determine the presence of a target by detecting the presence of a radar return signal in noise. Another example is the seismic exploration problem which utilizes the detection of reflected signals from …

Determining And Telemetering Snowpack Water Content In Mountainous Terrain, Stephen Davis Clarke

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Snowpack water content is an important parameter in streamflow forecasts. At the present time water content of the snowpack is determined by manual methods, which are often expensive and time-consuming. The use of a pressure pillow to determine water content has shown promise in experimental applications.

The design and analysis of a pressure transducer suitable for use with remote telemetry equipment is presented. The transducer uses changing fluid pressure to vary an inductor.

Telemetry techniques suitable for use on Utah snow courses are analyzed. Emphasis is given to the passive and active remote radio relays.

Matching Of A Horn Antenna To Its Dense Surrounding Media By The Use Of Artificial Dielectric Methods, Paul Arthur Ray

Masters Theses

"The purpose of this thesis is to design an artificial dielectric slug to match a horn in a media such as water and to discuss a method of determining experimentally its dielectric properties. The design is based on known artificial dielectric methods. The method of determining the dielectric properties is by microwave waveguide reflection techniques. This thesis deals with the theoretical aspects and suggests an experimental method of determining the practicability of such a matching method"--Abstract, page ii.

Antennas In Or At The Surface Of A Conducting Medium At Vlf, George R. Swain

Electrical and Computer Engineering ETDs

To meet the requirements of a number of military operations and to facilitate some types of geophysical exploration, it is necessary to communicate between points beneath or at the surface of the earth or of the ocean. This need has led to the investigation of antennas for use in or at the surface of conducting media. The purpose of this paper is to briefly survey the previous work on such antennas, to extend the concepts of effective length and other merit factors to antennas in or near a conducting medium, and to analyze the electrical behavior of the toroid and …

The Driving-Point Impedance Of An Electrically Short Cylindrical Antenna In The Ionosphere, William E. Blair

Electrical and Computer Engineering ETDs

1.0 Since the advent of satellites, there has been con­siderable interest in both military and peacetime uses of satellites as research instruments, communication relays, and transportation vehicles. In most cases, it is necessary to communicate with the satellites for purposes of trans­mitting and receiving information.

Electric Fields From Airborne Vertical And Horizontal Dipoles At Very-Low Frequencies, A. H. Garry Gibson

Electrical and Computer Engineering ETDs

A gap exists in present-day knowledge of the electric fields in the earth which are radiated from elevated antenna structures in the earth-air-ionosphere waveguide. It is the purpose of this paper to present a method of estimating the electric field at the earth-air boundary, caused by elevated antenna structures, and to show the existence of new phenomena that may lead to an improved design of communication systems.

Optimum Zero-Memory Nonlinear Filter, Benjamin Shaw-Hu Wang

Masters Theses

“The purpose of this report is to review the basic work described by Zadeh insofar as systems of class N₁ are concerned and to apply his general results to a specific problem in which a non-linear filter is mandatory simply because the linear filter is essentially ineffective. The ineffectiveness stems from the fact that the autocorrelation function of the signal plus the noise has essentially the same variational character as the signal alone. Therefore, the transfer function of the linear filter turns out to be simply a constant. Thus, the output of the linear filter is just an attenuated …

Artifact Filter., Kent William Swearingen

Masters Theses

"Peripheral blood pulse monitors are highly susceptible to noise-artifact-- in their present stage of development. The purpose of this thesis is to demonstrate a feasible means for filtering the artifact, using existing monitors. Since no peripheral pulse monitor (transducer) was available for experimentation, a simulated test input was devised with frequency variations from JO cycles/minute to 1.50 cycles/minute.

The filtering circuit predicts the time location of each input pulse. The location of the prediction is governed by the accuracy of the preceding prediction. This is controlled by an R-C timing circuit with a Schmitt Trigger and relay.

From the data …

On Optimum Receiver Using Decision Theory, Philip T. Tai

Masters Theses

“In recent years communication engineers have given increased attention to the study of communication through random media. The name random is used to describe a medium the properties of which are stated only in a statistical sense. For example the impulsive response of a certain medium may only be known as one of an ensemble of possible impulsive responses; the particular member of interest being drawn up according to some statistical rule. In other words there exists some "uncertainty" concerning the characteristic description of the medium. Significant work on these problems has been done by Price and Turin. Related work …

The Resolution Of Two Known Signals In White Gaussian Noise., Peter Cheng-Fang Wang

Masters Theses

"The problem of resolving two signals F1(t) and F2(t) in white Gaussian noise n(t) is treated here as a problem in statistical decision theory. We assume a situation in which one of two similar signals is present and an observer is asked to make a decision concerning which of the signals is present with a tolerable probability of error. The observer is allowed to use the best system which he can design for this particular purpose. Of course, this observation will be disturbed by noise and therefore, the observer is led to ambiguous selections. It is apparent that the optimum …

Real Time Testing With A Time Scaled Analog Computer., Wayne F. Balsman

Masters Theses

"A present limitation to the testing of a physical subsystem within an analog simulation is that the analog computer must compute in real time. If it is necessary to time scale the simulation of the complete system, a physical subsystem of the complete subsystem may not be tested within the simulation. Therefore, a means of changing the time scale of the analog signal is needed to test a physical subsystem within a time scaled analog computer simulation.

In this thesis a means of time conversion by sampling the analog signal at one rate, storing the samples, and reading the samples …

Adaptive Communication Systems, Arthur M. Breipohl

Electrical and Computer Engineering ETDs

The purpose of this study is to investigate an "adaptive" communication system in order to characterize the elements of adaptation. Although the term "adaptive" does not have a universally accepted meaning in the technical literature, it is usually applied to systems that have a significant ability to adjust their performance automatically over relatively wide variations in environment. In this sense almost any feedback system is adaptive, but the term is usually reserved for the more exotic systems which appear to make a deliberate effort to monitor the environment and then adjust their performance. Man is usually taken as the primary …

Small Signal Gain Analysis For A Seven Cavity Klystron Amplifier., William E. Hord

Masters Theses

"The problem was to find a suitable method of using the digital computer to calculate the small signal gain characteristics of a seven cavity klystron amplifier. Background material relevant to the problem was reviewed. The differential equations for small signal conditions in a gridless gap klystron were developed. These equations were then solved and put in a matrix form suitable for digital computer analysis. Suggestions for additional development were proposed"--Abstract p. ii

Infrared Modulation Using The Field-Effect Properties Of Germanium., Lloyd E. Brunkhorst

Masters Theses

"The absorption of infrared radiation, by free carriers in germanium, has been used to amplitude modulate infrared radiation. In the experiment, a space charge layer consisting of free carriers is established at the inner surface of a germanium sample by using the field-effect technique. Infrared radiation of a wavelength to which the germanium is transparent is then Internally reflected from this surface. The infrared radiation passes twice through the space charge layer for each internal reflection. With each pass through the space charge layer, the amplitude of the transmitted infrared is decreased. Amplitude modulation of the transmitted infrared is accomplished …

An Approach To Correlate Pulsed Radar And Photographic Data, Nasir Ahmed

Electrical and Computer Engineering ETDs

The Jet Propulsion Laboratory Lunar Program, which is supported by the National Aeronautics and Space Administration has two major projects underway. These are Ranger and Surveyor. The Ranger Project is in the flight stage whereas Surveyor is still in hardware development. The equipment of Ranger 3, 4, and 5 spacecrafts includes a radar altimeter to obtain radar reflection data, and a vidicon camera to obtain close-up pictures of the moon's surface. The data obtained in these flights will thus be available for analysis and comparison using the techniques outlined in this thesis.

Missouri School Of Mines Antenna Range Design., Russell Melvin Ousley

Masters Theses

"The problem was to design, construct and evaluate an antenna range which could be used in future research and instructional programs. The basic theory of range design and practical considerations were studied and a range was then designed and built from equipment which was either immediately applicable, applicable after modification or constructed to fit the needs of the range. Tests were made to determine the performance characteristics of the system with respect to the more important design parameters. Suggestions were given for future improvement of operation and expansion of the range capabilities"--Abstract p. ii

The Justification For And Design Of A Lunar Radio Observatory., Thomas Van Doren

Masters Theses

"The purpose of a radio telescope is to record information concerning the strength, spectrum, polarization, and direction of arrival of extraterrestrial electromagnetic radiation at radio frequencies. Earthly based radio observatories are hampered in their attempt to achieve this purpose by atmospheric absorption and reflection of the radiation. A lunar based system would not have this problem because the Moon possesses practically no atmosphere. However, other environmental conditions, such as micrometeorites, high frequency radiation, and extreme temperature variations, must be overcome. This thesis justifies the need for a lunar radio observatory and also describes a particular radio telescope system which should …

An Electronics Course Of Study For The High Schools In The Highline School District, Rual Elmer Tigner

Graduate Student Research Papers

Electronics is now being taught in the Highline District in one course for one year in each of the four high schools. There are no formal district objectives tor this course, no sequence of instruction, no list of course content. The writer has felt the need for the above and has interviewed all four instructors in the district and the assistant superintendent of instruction. It was agreed that in order to provide a more meaningful, correlated program, it would be necessary to have such a district-wide course of study developed. In view of this, the writer has attempted to develop …

A Theory Of Self-Evaluating Discrete Communication Systems, Samuel D. Sterns

Electrical and Computer Engineering ETDs

No abstract provided.

A Tunnel Diode Parametric Down Converter, Leland Lovell Long

Masters Theses

"The problem, as presented, is to derive analytical expressions for the conversion gain, bandwidth, and noise figure of a self excited tunnel diode converter and to verify, if possible, the validity of these express- ions by building such a converter. These analytical results are presented and discussed. The converter circuit is shown along with the resulting intermediate frequency output. Gain and bandwidth measurements are also given. It is concluded that the self excited converter could very definitely be of value as a low noise pre-amplifying device in the ultra-high frequency and microwave frequency ranges"--Abstract, page ii.

Propagation Between Conducting And Nonconducting Media, Richard H. Williams

Electrical and Computer Engineering ETDs

This paper contains a study of the electromagnetic fields caused by electric dipoles located within a highly conductive medium such as the sea. The theoretical treatment of this problem was begun in 1951 with Moore's thesis. "The Theory of Radio Communication between Submerged Submarines." Some subsequent major theoretical treatments of this problem have been published by Wait and Campbell, Lien, Banos and Wesley, and Anderson. All of the above work stems from Sommerfeld's classic paper published in 1909 where he considers the fields in the air caused by a vertical electric antenna located on the interface between the air and …

Design Of A Square Loop Magnetic Integrating Device, Fred Leland Grismore Jr.

Masters Theses

"The problem investigated in this research was the development of a static integrating circuit applicable to closed loop feedback control systems. Investigation of various methods of attack indicated that square loop magnetic cores offered characteristics required for the integration process. These include the ability to sum input information and the ability to store information for an indefinite period of time.

An experimental program was carried out, investigating the various properties of square loop magnetic materials and required design parameters. Through this work it was verified that the process of integration could be realized by using the partial switching volt-second absorption …

Design Of An Intermediate Frequency Amplifier And Variable Frequency Oscillator, Robert Charles Mcintyre

Masters Theses

"Since the advent of the transistor in 1948 many technological barriers have been overcome in the field of semiconductors. Unfortunately, however, there is a considerable period of time between the discovery of a scientific phenomena and its widespread use and understanding by practicing engineers. The motivating factor which prompted this investigation was primarily the lack of knowledge which the author possessed concerning transistors. The selection of the amplifier and oscillator design confined the study primarily to the transistor. Considerable time, however, had to be spent in the study of basic transistor theory before any phase of the design could be …