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...
The problems involved in measuring noise on video signals are
described. A brief review of several methods that have been used for
video signal noise measurement is followed by a detailed explanation
of the comparison technique. This technique is based on the principle
that noise sources with different spectral content,...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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....
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...
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...
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...
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...
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...
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-...
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...
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...
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...
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...
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...
The object of this work was to design and fabricate an integrated circuit using Integrated Injection Logic. Integrated Injection Logic (I[superscript 2] L) is a relatively new field and has many inherent advantages. These have been exploited in this work. Logic for the desired functions was designed and implemented in...
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....
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....
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...
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...
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...
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...
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...
A simple approach to developing approximate analytical
performance models for complex systems (such as distributed
processing systems or computer networks) is presented.
The approach is applicable in cases where measurement
or simulation data describing system performance are
available but the system is too complex for exact analytical
models to be...
The suitability of discrete least-squares optimal (Wiener) filters
for deconvolution of tone-burst waveforms is studied. It is shown
that: (1) such waveforms are not well suited to these filters without
preprocessing, (2) the use of exponential weighting results in a significant
improvement in filter performance and (3) that "phase-unwrapping"
in...
An application of the theory of conditionally Gaussian random
processes to filtering and stochastic control problems is presented
here. The results due to Liptser and Shiryayev are proved to hold
in the multidimensional case under somewhat relaxed conditions,
when compared to the original ones. Such a generalization is required
from...
The problem of synchronization arises in the interaction among
digital systems not sharing a common clock reference. The reliability of synchronizers is related to metastable operation of
bistable elements. Because of its subtle nature, the phenomenon
until recently was not widely researched. However, the literature
now contains a sound theoretical...
Regular structures such as PLA's are very
important to reduce VLSI design time. Interest in CAD
tools such as a practical reducing PLA generator is high.
This dissertation presents PRONTO as a practical, near-optimal
product term reduction method, whose general
heuristic approach consists of the following four steps.
First, select...
This paper corrects an apparent deficiency in the published
information concerning Hardware Description Languages (HDLs) by
introducing and discussing an approach for selecting an HDL for
use in a design project. Although three classes of HDLs are discussed
in this paper, High-Level Languages (HLLs), General Purpose
Simulation Languages (GPSLs) and...
Multiprocessor computers may eventually be the only method of
increasing computer throughout. One of the major problems with
multiprocessor computers is the interference or contention between
processors when accessing a shared resource. This work describes the
design, construction, and analysis of a prototype multiprocessor computer utilizing a replicated shared memory...
The electrical and optical properties of semi-insulating, epitaxial and ion-implanted GaAs and InP have been characterized and analyzed. Electron and hole traps in semi-insulating GaAs and InP, with activation energies ΔE[subscript T] ranging from 0.16 ± 0.01 to 0.98 ± 0.01 eV, have been detected and characterized by Photo-Induced Current...
This thesis reports on an investigation of the growth, by
Molecular Beam Epitaxy, of III,III-V ternary compound semiconductors.
Strained and unstrained growth was studied via the deposition of InGaAs
on GaAs and InP substrates. Lattice matched InGaAs on InP was grown,
and an in situ method was developed to find...
A new approximation technique to a certain class of nonlinear
filtering problems is considered in this dissertation. The method is
based on an approximation of nonlinear, partially-observable systems
by a stochastic control problem with fully observable state. The
filter development proceeds from the assumption that the
unobservables are conditionally Gaussian...
In microwave network analysis, proper matching of the measurement system is necessary to prevent measurement errors and provide a
proper terminating impedance for the device-under-test. To obtain
this matching, a buffer amplifier is often used in the first stage of
the network analyzer.
This study describes the design and analysis...
Accurate and efficient computational methods to evaluate the
quasi-TEM parameters of various planar structures such as microstrips,
coplanar lines and coplanar waveguides are developed. The characteristic
parameters of all these structures which are used extensively
in microwave integrated circuits for applications as transmission
lines and other circuit elements are computed...
Linear phase variable filters that are obtained with a frequency transformation of the form cos(ω) = P(cos(W)) were analyzed, where P is a finite degree polynomial, ω is the prototype frequency and W is the transformed filter frequency. A new transformation of third order is proposed. The new variable filter...
The problem of optimization of stochastic dynamic systems with
random coefficients is discussed. Systems with both Wiener processes and uncertain random-process disturbances are dealt with in
this dissertation, and these include certain bilinear stochastic
systems. It is the purpose of this thesis to study the optimal control and, to some...
Frequency domain design of deconvolution filters is
studied using Fast Fourier Transform. Filters for both the
spike and the Gaussian reflector wavelet are obtained. True
deconvolution filters are infinitely long IIR filters,
and frequency domain analysis is an effective way of
finding its optimum finite length approximation for an
arbitary...
The scope of this project was to build a high
energy impulse generator to be used for educational
and research purposes, such as small scale modeling
of lightning and switching surges or small scale
simulation of an electromagnetic pulse (EMP).
A one-stage impulse generator was designed to
deliver a voltage...
Two-way transmission of data on broadband community cable television systems is considered in this thesis. A discussion of the data transmission environment is presented which attempts to characterize the channel noise and interference which degrades data transmission performance. The analysis considers channel degradation resulting from additive gaussian noise and various...
White electroluminescence (EL) was observed for the
first time from diamond-like carbon (DLC) films at room
temperature. Electroluminescence was observed by the
application of ac voltages in excess of 200 V to a metal-insulator-
semiconductor (i.e. DLC)-insulator-metal (MISIM)
device structure.
For EL applications, three types of the DLC films were...
The objective of this thesis is to describe the design and
implementation of a VSLI reduced instruction set computer (RISC).
The RISC machine constitutes a new style of computer architecture.
It differs significantly from the complex instruction set computer
architectures (CISC) of the past. RISC architectures are
characterized by their...
The major goal of this research work was to develop better
electrical measurements for the evaluation of silicon material
quality.
The first approach investigated was the Zerbst generation
lifetime measurement technique. It was demonstrated that the
error in the estimation of the generation lifetime obtained with
this technique could be...
As a result of the automation revolution, robots
are assuming ever more complex and demanding tasks.
Robot system control schemes for fast and precise robot
motion require utilization of the entirety of the robot
dynamic formulations and the ability to evaluate these
formulations in real-time. The dynamic formulations,
which take...
A microprogramming teaching tool was designed and implemented. This tool was based on the Am 2900 bitslice microprocessor family. It provides tools for understanding software development for a simple bitslice microprocessor.
A compartmental model of lymphocyte circulation
through a lymphnode is derived and simulated. The
purpose of the model is to analyze experimental data and
in turn design experimental plans from the analysis in
order to obtain sufficient data for the organ-distributed
immune response. The model will be used to predict...
The U.S. Air Force models many naturally occurring
phenomena. To validate such models, an automated data
collection system is used. Since validation is dependent
upon correct data, an inexpensive method to detect
erroneous data was investigated. The method uses a Wiener
filter to predict values one sample in advance. If...
In this research, a novel shunt compensation scheme
design procedure is developed for unbalanced, untransposed
n-phase transmission lines. The main function of the
scheme is to reduce the effect of the capacitive coupling
on untransposed transmission lines to levels where successful
single-pole switching is assured. The analysis procedure
is carried...
The sliding mode controller, based on the theory
of the Variable Structure System (VSS), is considered
for a robot manipulator. By consideration of VSS theory,
the nonlinear interactions of manipulator dynamics
are suppressed by use of linear sliding equations, and
VSS robustness with respect to the unknown physical manipulator
parameter...
This paper discusses the design strategies for interface of bus
architectures. It also describes the design of interface between the
two popular bus architectures, the Micro Channel and the Nu Bus.
The main objective of this thesis is to develop a procedure for
bus interface design and use this procedure...
This thesis describes the design of a Reduced Instruction Set Computer. Its instruction memory utilizes a unique cache architecture and a two-stage memory pipelining technique. Because of the bandwidth of the 64-bit instruction bus, instruction prefetching is possible and is implemented. The data memory is bridged by a four-way set-associative...
Increasing automation and highly flexible manufacturing processes cause increasing complexity for manufacturing system. FMS (Flexible Manufacturing System) is an approach to solve this problem. Since the elements of the FMS and manufacturing process performance are closely interrelated, the application of simple modeling and emulation techniques in the planning stages for...
Recently, switched-current circuits have received great
attention because they offer potentially better performance in terms
of speed, low voltage power supplies, and accuracy in mixed-mode
analog-digital signal processing. In this thesis, the distortion
characteristics, DC offset and AC gain errors induced by the threshold
voltage, channel width, channel length, and...
A highly flexible numerical simulation model for the performance
prediction of brushless dc drives is presented, which is capable of
investigating unbalanced and asymmetrical operating conditions as well
as drives with non-ideal parameters. Numerical speed-up procedures
allow for the investigation of pulse-width modulated (PWM) drives using
a personal computer. Experimental...
Ever-increasing size, complexity and operation costs in modern
power systems have stimulated the intensive study of an optimal
Load Shedding and Generator Rescheduling (LSGR) strategy in the
sense of a secure and economic system operation.
The conventional approach to LSGR has been based on the application of LP (Linear Programming)...
The new CMOS folded source-coupled logic (FSCL)
technique intended for mixed-mode integrated circuits has
been designed. It has advantages over conventional CMOS
circuit in terms of reduced current spike, circuit delay,
logic flexibility, and layout density. A simple CPU
implemented in 2 μm CMOS technology with a 5.0 volt supply...
A short-circuit-protected line-driver circuit is
particularly adapted for use in a CMOS differential line-driver
system, where one line-driver circuit provides a
true output signal, and another line-driver circuit
provides a complementary false output signal. A short-circuit
is sensed by measuring current through a secondary
pull-up transistor, and disabling a primary...
Team pursuit-evasion games are studied here with one performance
index for the team as a unit in competition with one common opponent.
Particular structures of team games are discussed after a brief introduction
of the two-player differential games. The classical calculus
of variations is used to derive the feedback strategies...
Local computer networks are being installed in diverse application areas. Many of the networks employ a distributed control scheme, which has advantages in performance and reliability over a centralized one. However, distribution of control increases the difficulty in locating faulty hardware elements. Consequently, advantages may not be fully realized unless...
The electrical properties of ion-implanted GaAs FET channels
are investigated by two methods. First, the channel current (I) as
a function of voltage (V) is examined at different temperatures and
using different voltage ramp rates. The standard FET I-V curve,
which can be observed on a commercial curve tracer, is...
Morphological filters have shown good performance in various image processing applications. Furthermore, their algorithms are easy to implement in special architectures, with the exception that linear filtering cannot be implemented in many of these cases. In this study, a new architecture and corresponding algorithm, capable of realizing linear shiftinvariant filters,...
The system in this thesis uses multiple Intel iSBC86/12A cards
connected to the Intel Multibus. The system was written using the Intel
language PLM86. The final result is a low level debug tool that
provides the user with the following capabilities: examine/change
memory, examine/change processor registers, load a user written...
Minimizing the number of product terms in a PLA implementation is a large step
towards saving area on a VLSI chip using PLA logic. Due to the large amounts of computer
time necessary to achieve this minimization, a number of heuristic approaches have
been developed to provide near-optimal solutions in...
This paper describes the design and implementation of
"A multiprocessor node for communication and control"
(MPCC). MPCC is a high speed, high performance local area
network capable of performing real time control tasks. This
is achieved by the concurrent operation of two 8051
microcontrollers, a dual port RAM and the...
An important task of a Variable Speed Generation (VSG)
system is the capability to maintain and control the terminal
voltage at some desired value as determined by the
reactive power dispatch strategy.The main objective is to
design a sub-optimal fixed-parameter controller in the
sense that constraints with respect to practical...
The resolution of multiple overlapped reflections is
achieved by designing inverse filters using frequency
domain deconvolution. A careful study reveals a number of
problems involving frequency domain design of spike inverse
filters. These include the presence of noise and aliasing
in both the filter response and its output resulting from...
The core area of a conventional CMOS digital gate
array consists of only one size of NMOS device and one
size of PMOS device. Both primitives have fixed minimum
channel lengths, and this has significantly impeded analog
applications. This work has shown that by forming series
and parallel interconnections between...
A design style is presented for a self-synchronized,
multiple input change, asynchronous state machine which
processes input changes at a speed limited only by the
required machine behavior and implementation technology.
This state machine will operate at this ultimate speed
because of a new asynchronous delay element with unequal
rising...
We extend previous results for optimally scheduling
concurrent program modules, called tasks, on a fixed, finite number
of parallel processors in two fundamental ways: (1) we introduce a
new heuristic which considers the time delay imposed by message
transmission among concurrently running tasks; and (2) we
introduce a second heuristic...
Two new medium access protocols for ring type local area networks,
CTR (Concurrent Token Ring) protocol and DRUID (Destination Removal
withoUt Intermediate node Delay) ring protocol, are proposed, designed and
analyzed. A destination partial removal technique is designed and used in
these two protocols to support concurrent message transmission and...
"Expert systems" is an area in the field of
artificial intelligence which attempts to encode an
"expert's" heuristic knowledge and reasoning ability into
a computer program. The purpose of this study is to
investigate the applicability of using an "expert system"
in a closed-loop automatic control system.
An "expert system"...