Index Catalog // ScholarsArchive@OSU

Theoretical influence of untransposed transmission line construction on system losses and voltage balance

Creator:: Chanakorn, Chavalit
Abstract:: The purpose of this thesis is to investigate the necessity of transposition in the construction of overhead transmission lines. Line currents, line voltages and line losses of both the transposed and untransposed lines were calculated and compared for two different voltage classes. The conventional method of symmetrical components was used...
Resource Type:: Masters Thesis

The use of electromagnetic Walsh waves in radar

Creator:: Schaffer, Alvin
Abstract:: The question of the suitability of Walsh functions or similar bi-valued functions used as a radar electromagnetic carrier waveform is considered. Walsh functions are described and effective sinusoidal steady state transfer functions are defined for transmission elements, antenna systems, and propagation media. The argument is made that the unit impulse...
Resource Type:: Dissertation

The identification of Dungeness crab from the power spectral density function of their acoustic signature

Creator:: Eghbali, Hassan J.
Abstract:: The power spectral density of the acoustic signature of Dungeness crab was calculated by the use of digital computer. The signal produced by the Dungeness crab was an analog signal. Therefore a conversion of the signal from analog to digital was necessary. This was done by sampling the acoustic signature...
Resource Type:: Masters Thesis

The effect of rain on satellite communications above 10 GHz in the Pacific Northwest

Creator:: Engelbrecht, Rudolf S.
Resource Type:: Dissertation

The design of an interface between IEEE standard bus and unibus-CP1100/GPIB interface

Creator:: Aghdasi, Farhad
Abstract:: CP1100/GPIB Interface is an interface between the "General Purpose Interface Bus", which is an implementation of the Universal Bus described in IEEE Standard 488-1975, and Unibus. This interface enables TEKTRONIX CP1100 series controllers to operate GPIB- compatible instruments connected to the General Purpose Interface Bus. The designer can now incorporate...
Resource Type:: Masters Thesis

Statistics of speckle propagation through the turbulent atmosphere

Creator:: Lee, Myung Hun
Resource Type:: Dissertation

Simplification of large linear systems using two-step iterative method

Creator:: Shoji, Fumihiro Frank
Abstract:: The order of the practical system (e.g. nuclear power plants, electrical power network and chemical plant) is quite large. However, there are many limitations in computing facilities for the large system. Because of these limitations, it is often necessary to reduce the order of the large system using an approximation....
Resource Type:: Masters Thesis

REGTRAN and MICRO, the implementation of two digital system simulators

Creator:: Baheti, Padma R.
Abstract:: REGTRAN (REGister TRANsfer), a hardware description language and SYSSIM (SYStems SIMulation), a simulator for the system described by REGTRAN were originally developed by Edward Pett, Jr [33] at the University of Texas at Austin. These two programs are successfully used to simulate many digital systems of complex nature. It is...
Resource Type:: Masters Thesis

Radiation losses in microstrip circuits

Creator:: Lo, Sui-Sang
Abstract:: The purpose of this study is to investigate radiation losses in microstrip circuits. Expressions are derived to evaluate the radiation resistances (or conductances) for single terminated, open and short-circuited lines. The quality factor Q of open and short-circuited stubs is evaluated. An analytical procedure is formulated to evaluate the radiation...
Resource Type:: Masters Thesis

Preliminary design of the RTAF command and control two-level parallel computing system

Creator:: Meesajjee, Chulit
Abstract:: This paper investigates the benefit of various parallel processing architectures for a Command and Control system for the Royal Thai Air Force. Parallel processing has been shown to be useful for air defense and air traffic control applications. Its advantages are examined within the constraint imposed by the available resources...
Resource Type:: Dissertation

Pattern recognition of speech using hybrid computer feature extraction

Creator:: Herr, Alan Jack
Abstract:: Most technological problems associated with man-machine conversations have been solved and are well documented in both the contemporary technical and lay literature. The major remaining technological problem is the real time conversion of a human's vocal uterances into a "written" phoneme sequence representing the information content of speech. The work...
Resource Type:: Dissertation

Parameter and volterra-kernel estimation of bilinear systems

Creator:: Baheti, Radhakisan Sohanlal
Abstract:: It has been established that bilinear models occur frequently in nature and offer some important advantages from the standpoint. of controllability, optimization and modeling. The estimation of bilinear systeim models from the Measurements of input-output data are discussed. In the first approach a parametric model of a discrete-time linear system...
Resource Type:: Dissertation

Optimizing the microcode produced by a high level microprogramming language

Creator:: Ma, Perng-Yi
Abstract:: The purpose of this research is to develop methods to translate a certain machine independent intermediate language (IML) to efficient horizontal microprograms for a class of microprogrammable machines. This IML has been developed by Malik (12) and is compiled directly from a high level microprogramming language used to implement a...
Resource Type:: Dissertation

On the state and parameter estimation of stochastic bilinear systems : a sub-optimal filtering approach

Creator:: Shadman-Valavi, Ali
Abstract:: Bilinear systems due to their variable structure properties offer more versatility in modelling of nonlinear processes than linear systems. The state estimation problem for a continuous bilinear system with a continuous observation model is studied and the results are extended to the case where the observations are of a discrete...
Resource Type:: Dissertation

Nonsymmetrical coupled microstrip lines for applications as ideal directional couplers

Creator:: Emery, Timothy R.
Abstract:: A variational integral method in the Fourier transform domain is used to calculate the characteristic normal mode parameters of a coupled pair of nonsymmetrical microstrip transmission lines in an inhomogenous dielectric medium under quasi-TEM conditions. These together with the theory of such structures are used to show that ideal directional...
Resource Type:: Masters Thesis

Multiple-output combinational network minimization

Creator:: Lin, Pʻei-chen
Abstract:: An important step in the design of digital networks lies in the derivation of the switching formulas which describe the combinational logic networks in the system. In most large systems the number of gates and the number of connections are major factors that affect the cost of the system. An...
Resource Type:: Masters Thesis

Multiple-fault detection in iterative arrays

Creator:: Ramamurti, Chandramouli
Abstract:: With the advent of LSI, iterative forms of realization of digital systems are becoming increasingly popular with system designers. Many problems occurring in digital computer design render themselves suitable for iterative realization. These include adders, arithmetic logic units, coding and decoding circuits and so on. Fault-free functioning of such systems...
Resource Type:: Dissertation

Liquid crystal thermography : a new system for breast cancer detection

Creator:: Bichara, Kamal Fouad
Abstract:: A liquid crystal thermographic technique was developed for application to several problems in clinical medicine and physiology. The procedure was inexpensive, rapid, simple, versatile and acceptable to patients. Investigators in the past have used cholesteric liquid crystals for thermography but their use was limited to research in the medical field...
Resource Type:: Dissertation

Investigation of electric field-induced optical absorption changed in CdS

Creator:: Shimoda, Raynor Yoichi
Abstract:: The feasibility of using the Franz-Keldysh effect in practical light intensity controlling devices was investigated. Reverse-biased diodes made from CdS were implemented to obtain high electric fields necessary for the effect. The three types of diodes studies were: MIS, metal-semiconductor barrier, and p⁺-n heterojunction. An expression for the change in...
Resource Type:: Dissertation

Instrumentation system for high speed data sampling of electrical machinery

Creator:: Brisbine, Glen Edward
Abstract:: The objective of this thesis is to develop criteria for a data acquisition system for electrical machinery capable of sampling a signal every 0.2 msec with a desired accuracy of 0.1%. The system to be measured includes both AC and DC voltage and current signals from several points. The main...
Resource Type:: Masters Thesis

Injection of electrons into silicon dioxide from planar silicon substrates

Creator:: Rode, Ajit G.
Resource Type:: Dissertation

Information processing errors in linear feedback control systems

Creator:: Chong, Hoi-yeung
Abstract:: This report is concerned with the analysis of the effect of finite wordlength, channel capacity and source rate in digital feedback control of linear systems. The cases considered are (1) finite wordlength A/D conversion, no feedback delay, ideal ROM (read only memory) controller; (2) finite A/D wordlength (source rate), state...
Resource Type:: Dissertation

Industrial power system faults

Creator:: Badr, Ahmad Mohamad Amin
Abstract:: The purpose of this thesis is to represent and calculate unsymmetrical secondary faults on a grounded wye-to-delta transformer bank. This thesis is specifically concerned with the secondary connections often encountered in industrial installations. Faults on these systems have not been adequately investigated. Three types of faults are considered, namely: 1....
Resource Type:: Masters Thesis

Hybrid, high speed fault detection based on instantaneous line voltages

Creator:: Ramchandani, Hiranand Balchand
Abstract:: This fault detection scheme is based on sampling the instantaneous phase voltages and checking their sum and magnitude against a specified voltage. Faults on the system cause unbalances and distortion of the phase voltages and currents. The currents and voltages change in magnitude and/or phase position with respect to the...
Resource Type:: Dissertation

Hybrid computer simulation of wind-driven ocean currents

Creator:: Vithayathil, Francis Joseph
Abstract:: A simulation method using a hybrid computer is developed in this dissertation to enhance the study of wind-driven ocean circulation. The simulation is based on the mathematical model developed by Ekman. Pure digital simulation is not economical due to excessive computer time required for the solution of the partial differential...
Resource Type:: Dissertation

Hierarchial digital communication processing in a multi-access tele-communication environment

Creator:: Fryklund, James
Abstract:: This paper is concerned with the application of hierarchial and parallel computing structures to digital data communications processing in a multi-access telecommunications environment. Designs are analyzed and evaluated in terms of data collected from remote access tele-communications traffic and in terms of the application to several processing problems in the...
Resource Type:: Masters Thesis

Functional expansions in bilinear system analysis

Creator:: Karanam, Veerabhadra Rao
Abstract:: Bilinear systems, encountered in many important applications of engineering, biological and socio-economic systems, represent the logical step in complexity between the linear systems which are inadequate in the modeling of various dynamic processes and the difficult realm of nonlinear systems. This dissertation studies two functional expansions in bilinear system analysis-...
Resource Type:: Dissertation

Digital techniques for change detection from remotely sensed data (Landsat-imagery)

Creator:: Eghbali, Hassan J.
Resource Type:: Dissertation

Digital model of a synchronous generator excitation system

Creator:: Ramchandani, Hiranand Balchand
Abstract:: This thesis develops a simplified and logical simulation model for an amplidyne excitation system for a synchronous generator with an automatic voltage regulator. The non-transfer function representation using field determined parameters including variable inductance and machine saturation was used to reduce the computing time for the stability analysis. The simulation...
Resource Type:: Masters Thesis

Designing a high level microprogramming language

Creator:: Malik, Kamran
Abstract:: The purpose of this research is to design a high level language (HLL) suitable for microprogramming. A top down design technique has been adopted which makes the language design process simple and accurate. The primitive operations of a high level language for producing emulators is shown to include special purpose...
Resource Type:: Dissertation

Design of a mini-computer controlled digital integrated circuit tester

Creator:: Fasang, Patrick Pad, 1941-
Abstract:: The purpose of the thesis is to design, construct, program, and test an automatic integrated circuit test system. The class of integrated circuits tested was restricted to digital integrated circuits. The general concept of testing a digital integrated circuit is based on the truth table of that circuit. A combination...
Resource Type:: Dissertation

Computer analysis of a class of acoustic signals

Creator:: Miller, Michael Robert
Abstract:: A procedure for displaying cursory computer analyses of time series acoustic signals is described. The graphic presentation is optimized for visual analysis. The results displayed represent time series signals and/or Power Spectral Density estimates. Both hardware and software components of the procedure are described and compared with current methods. Suggestions...
Resource Type:: Masters Thesis

Compartmental analysis of the immune system

Creator:: Lawrence, Karen
Abstract:: A compartmental model of the immune system is simulated. Chapter I discusses the importance of such a model, reviews past immune system models, and summaries the immunological theory the model is based upon. In Chapter II, the compartmental representation of the immune system is developed from immunological and physiological theory....
Resource Type:: Masters Thesis

Bilinear control processes with application to immunology

Creator:: Hsu, Chin-Shung
Abstract:: As a significant class of nonlinear systems, bilinear systems (BLS) are extensively developed in the past years. In addition to their advantages over linear systems which are often not adequate to represent accurately many control processes, the BLS are particularly appealing in modeling biological systems in which parametric controls are...
Resource Type:: Dissertation

Application of microstrip transmission line to high speed digital data bus

Creator:: Soong, Wilson
Abstract:: Recent acheivements in high speed digital integrated circuits has prompted the system designers to search for a practical method of inter-connecting these high speed circuits. This paper describes the implementation of the microstrip transmission line on a high speed digital data bus. Transmission line and characteristic impedance, termination with single...
Resource Type:: Masters Thesis

Analysis of new protocols for computer communication networks

Creator:: Warner, Clifford John
Abstract:: An advanced forward 'area tactical radar network, now under conceptual development by the Air Force Electronic Systems Division, can be viewed as a novel form of computer network but with other unique problems resulting from the specialized nature of the application. The proposed network will link together a number of...
Resource Type:: Dissertation

Analysis and synthesis of exponentially tapered, nonuniform transmission line impedance transformers

Creator:: David, Frank Kolar
Abstract:: The exponentially tapered, nonuniform transmission' line, applied as an impedance transformer, is analyzed and modified. The analysis develops an expression for the input reflection coefficient that has the magnitude and phase as distinct functions. This allows ease in comparing the approximate and exact solutions and in developing the S-parameters for...
Resource Type:: Masters Thesis

Analysis and simulation of a variable speed induction motor

Creator:: Haskins, Raymond A.
Abstract:: A model of a squirrel cage induction machine, d.c.- link power supply and centrifugal pump is developed and used in the design and evaluation of a perturbation feedback control system for a sewage pumping station. A comparison of the simulation model of the induction machine and a laboratory machine to...
Resource Type:: Masters Thesis

An eraseable MOS read-only memory

Creator:: Johnson, Norman Leland
Abstract:: A non-volatile electrically alterable read-only memory using an MOS field effect transistor with a threshold voltage which depended upon the position of ionic charges for its memory was fabricated. The conventional silicon dioxide layer was replaced by a composite layer consisting of thermal silicon dioxide, electron beam evaporated aluminum oxide,...
Resource Type:: Dissertation

A study of time series interpolation and decimation with signal processing applications

Creator:: Kraemer, Thomas Fredrick
Abstract:: Decimation and interpolation is shown to be an effective technique for reducing the storage requirements for bandlimited time series. Interpolation and decimation is theoretically developed using z-transform theory and graphically interperted. A sequence of data acquired by sampling a sonar signal is used to demonstrate the effects of decimation. Using...
Resource Type:: Masters Thesis

A study of the effect of the rotor coil couplings of a synchronous machine on its predicted transient response

Creator:: Nehrir, Mohammad Hashem
Abstract:: The effect of the mutual inductances between the rotor coils of a synchronous machine on its defined reactances and predicted transients are investigated. Two linearized models of the machine are considered. One uses the Laplace-Transform approach, with minimum number of assumptions on the inter-coil couplings, in developing a model for...
Resource Type:: Dissertation

A simulation study of a heuristic technique for approximating availability percentiles for cascaded independent systems

Creator:: Squire, David Charles
Abstract:: This thesis presents work done to verify the accuracy of a heuristic method for computing availability percentiles for cascaded independent systems. Previous work has provided a model for a single line that will be used as the basis for a simulation of cascaded and parallel systems of lines. The simulation...
Resource Type:: Masters Thesis

A schemata model of real-time information processing systems

Creator:: Szulewski, Paul A.
Abstract:: In an attempt to provide a practical means to measure the information processing capacity of a real-time digital processing system a theoretical framework, the Real-Time Schemata, whose basis is a schematic description and a measure of "useful information," is presented. The description applies to processes that would typically be implemented...
Resource Type:: Masters Thesis

A parametric analysis of the capabilities of undersea acoustic imaging

Creator:: Calligan, C. C.
Abstract:: The feasibility of utilizing acoustic imaging techniques for improving the undersea viewing capability of small submersibles is investigated. The limiting values of major parameters in acoustic imaging systems are established and graphs which illustrate the parametric relationships are presented. A series of sample calculations illustrate how the graphs can be...
Resource Type:: Masters Thesis

A new loop structure for distributed microcomputing systems

Creator:: Jafari, Hossein
Abstract:: A new modular loop architecture for distributed computer systems has been developed and compared with three of the most prominent loop architectures currently being used. The competitive loops with which the new architecture has been compared are the Newhall loop, the Pierce loop and the DLCN loop. The four loop...
Resource Type:: Dissertation

A new comptutational method for constrained nonlinear programming

Creator:: Bhatia, Surendra P. S.
Abstract:: In this dissertation, a new computational method for equality constrained nonlinear programming is developed. Specifically, problems of minimizing a nonlinear objective function f(x) subject to constraints h(x) = 0, where f is a scalar valued, x is an n-vector and h is a m-vector with m < n is considered....
Resource Type:: Dissertation

A dynamic model of exchange rate in relation to international trading

Creator:: Sun, Keong-wah Gary
Abstract:: It is popular belief that the volatility of the exchange rate is due to the balance of payments, which in turn is mainly influenced by the balance of trade. A closed-loop dynamic economic model is proposed to describe and analyse the effect of the international trade of a country on...
Resource Type:: Dissertation

A computer simulation model of land use dynamics in the State of Oregon

Creator:: Calligan, C. C.
Abstract:: The dynamics of land use in the State of Oregon are simulated on a digital computer. The introductory chapter outlines the complex nature of the problems facing the post-industrial society and argues that the scientific and professional estates share in the responsibility for public policy formulation. The second chapter .presents...
Resource Type:: Dissertation

A computer controlled robot analyzer for in situ water quality monitoring

Creator:: Birch, Kenneth Norman
Abstract:: A new, computer oriented system for automatic, in situ monitoring of water quality is proposed which makes full and effective use of modern computer technology. The main objective of this thesis work was the development of the concept for in situ computer controlled experimenting as a reasonable and effective means...
Resource Type:: Masters Thesis

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