Engineering Commons^™

Computer Aided Design Of Linear Phase Finite Impulse Response Digital Filters, Wentao Lyou

Retrospective Theses and Dissertations

This research report is an investigation of techniques for designing linear phase finite-duration impulse response (FIR) filters. The software package, CADFIR, developed for this project can be used to design linear phase FIR digital filters via three well-known design techniques: the window method, the frequency sampling method, and the optimal filter design method. CADFIR has options for designing such standard filters as lowpass, highpass, bandpass, and bandstop filters as well as multipassband-stopband filters. The fundamental properties of FIR filters are discussed and design algorithms associated with the three FIR filter design techniques are developed. Design examples are included and the …

Computerized Data Acquisition In Experimental Applications, Jay A. Meyer

Retrospective Theses and Dissertations

This thesis project was intended to provide the University of Central Florida Mechanical Engineering and Aerospace Sciences Department with computerized data acquisition (CDA) capabilities. The data acquisition system has been designed for use in laboratory instruction and research experimentation. The development of the CDA system began in the spring of 1987. This development included the acquisition of system hardware and the design of software. The expertise required to carry out this project was obtained by many hours of laboratory experience. This experience was gained not only in university laboratories but also in international studies at the Euratom laboratory in Italy. …

Direct Digital Control Of A Liquid Level Control Unit, Barbara Viehman Lytle

Retrospective Theses and Dissertations

A system was developed to allow undergraduate engineering students the capability of simulating various types of control modes in a laboratory environment. The use of digital control and common industrail components such as transducers, recorders, and valves was implemented.

Modification to an existing bench scale process control system is outlined and demonstrated. A computer program was written which interfaces with the hardware and data acquisition software allowing the user many options to study control processes under a variety of conditions. A wide range of parameters can be selected. System parameters can be saved on disk or printed directly. Data are …

Investigation Of Surface And Subsurface Deformation In Sliding Wear, Patrick J. Mohr

Retrospective Theses and Dissertations

The research presented in this paper is part of the ongoing work by Moslehy and Rice et al. at the University of Central Florida in the investigation of sliding wear using laser techniques. This research paper investigates related wear phenomena, metallographically, and presents some general trends observed in the growth of the elastic - plastic interface as a function of time. Observations were made on the surface and at near surface sections on several brass pin specimens, each being subjected to sliding wear for various periods of time. Metallographic observation of the plastic deformation that occurred on the surface of …

Efficient Algorithms For The Fixed Charge Problem, Ahmad Abdulah Moreb

Retrospective Theses and Dissertations

The main thrust of this research is to develop four solution procedures for the Fixed Charge Problem. All are based on approximating the fixed charge component by strictly polygonal linear components. The first procedure uses the functions technique to approximate the fixed charge; then linear programming with the restricted-basisentry technique is used to arrive at the final solution. Although this method starts with an approximated version of the fixed charge component, it arrives at an exact value to the objective function without the need for re-evaluating the objective function. The other three solution procedures are based on approximating the fixed …

Design Of A Systolic Architecture To Implement Graphic Transforms, Aimee A. Murray

Retrospective Theses and Dissertations

The graphics generator hardware is an important component of flight-training simulators. The function of this hardware is to generate 3D perspective images at rates of 30 frames per second to produce realistic out-ofwindow scenes viewed by the crew under training. Within most graphics generator hardware are array processors which achieve high computation throughput necessary to generate real-time processing. The function of the array processors is to transform, clip, rotate and perspective project the data base into screen coordinates for use by the graphic generator. A FIMD (few instructions multiple data) systolic architecture is proposed to achieve high computational throughput that …

Numerical Solutions Of Poisson's Equation In A Superlatice Device, Norman Todd Rollins

Retrospective Theses and Dissertations

The relationship between the built-in potential and the energy bands in a heterojunction device is defined using the Anderson model. Based on this model, Poisson's equation for a nonhomogeneous semiconductor device in thermal equilibrium is derived and solved analytically for the special case of a doubly intrinsic abrupt heterojunction. Several numerical methods of solving Poisson's equation for general cases are explored to find the most efficient method. The validity of the chosen numerical method is tested against both the analytical solution for a Ge/GaAs doubly intrinsic diode and recently published results from similar numerical simulation studies. A p-i-n superlattice device …

An Ada Simulator For The Structured Functional Simulation Of A Digital Signal Processing System, Christopher Paul Roney

Retrospective Theses and Dissertations

A behavioral-level simulator designed for FIRST, a silicon compilation system for digital signal processing, is implemented in the Ada* programming language. The simulator accepts as input a digital signal processing system description written for the FIRST ([ast Implementation of aealtime ~ignal transforms) silicon compiler, and provides an interactive post-processing signal trace facility. The simulator is a time-driven simulator which contains a FIRST description language parser, a subset of the FIRST primitives, and the capacity for maintaining a full history of all signals in the system. The primitives in the FIRST description language are common to digital signal processing systems (e.g., …

Dynamic Performance-Based Student Model For An Intelligent Simulation Training System, Jenifer M. Sargeant

Retrospective Theses and Dissertations

Student modeling has been the subject of research since the mid-1970's. A student model is an evolving description of what the student knows about the subject domain. Much of the previous research has concentrated on evaluating a student in performing cognitive tasks. The Intelligent Simulation Training System (ISTS) applies the techniques of Artificial Intelligence, Intelligent Tutoring Systems and Expert Systems to simulation-based training. The ISTS Student Model is unique in that it evaluates the student in performance-based tasks. It monitors and records the student's ability to maintain relationships between objects in space and time. The scope of this research was …

Investigation Of Wear Of Materials By Laser Speckle Photography, Mohamed A. Seif

Retrospective Theses and Dissertations

This study utilizes a non-contact technique, laser speckle photography, to measure deformations associated with sliding wear. These deformations are those which occur on the "side" of a rectangular-section pin which is in sliding contact against a counterface disc. The "side" of the pin is illuminated by a pulsed ruby laser beam, and a double exposure specklegram is made to obtain deformations which occur between laser pulses. So, by appropriately sequencing pulses, deformation histories can be obtained, in situ. Since the exposed "side" of the thin pin specimen represents the "cover" layer under which subsurface sections lie, the deformation history observable …

Optical Interferometric Formation Of Phased Array Antenna Footprint/, John E. Sherwood

Retrospective Theses and Dissertations

A 40 dB gain RF Low Noise Amplifier (LNA) matched to a photodiode input is designed using TOUCHSTONE (S-parameter based CAD software), built, and tested. The RF LNA formed the detector of a Mach-Zehnder interferometer constructed with single mode fiber, coupler, Gradient Index Rod Acousto-optic modulator (ADM) . (GRINROD) lenses, and an The ADM is used to frequency shift the optical frequency by 125 MHz, and the motion of a GRINROD lens is used to produce an optical phase shift that is recovered at the detector as an electrical phase shift by using heterodyne detection . Finite Hankel transforms are …

Survey Of Local Area Networks For Low End Systems, Wipawadee P. Sonprasit

Retrospective Theses and Dissertations

Local area networks (LANs) that support small systems, the personal computers in particular, are surveyed. LAN environments, factors motivating interest in PC LANs, and capability requirements of LANs posed by low-end systems users, are outlined. Discussion of LAN technology includes standards, architecture, transmission media, topology, transmission techniques, access protocol, and performance factors topics. Commercial products are presented with more in-depth outline on selected products. Observation and future of PC LANs conclude the survey.

Utilizing Object-Oriented Design To Reduce The Effort Expended On The Maintenance Phase Of A Software Project, Susan Muriel Storma

Retrospective Theses and Dissertations

Due to poor software design, software products typically incur substantial cost overruns during the maintenance phase of the life cycle. Use of modern software engineering principles (e.g., information hiding and abstraction) can i mprove the design of a product and, hence, reduce the effort associated with the maintenance phase of a product. Object-oriented design (OOD) is a tool which embodies these software engineering principles. This paper first presents the concepts of 00D and how it is used. A design example involving a programmable temperature controller is presented utilizing 00D and is then compared to a top-down design approach. Conclusions are …

An Adaptive Multi-Scene Correlation Algorithm, Paul E. Vogt

Retrospective Theses and Dissertations

Digital scene matching algorithms have been used in both military and commercial image processing systems for years. The trend toward using multiple sensors in military imaging systems has generated anew interest in real time techniques to accomplish sensor fusion tasks such as field of view alignment. This thesis analyzes methods presently in use and introduces a novel algorithm that improves scene correlation performance. The focus of the new technique is in the segmentation area, where significant features are extracted from background and clutter. These performance improvements are especially helpful when the scene contains excessive noise and or lacks detail, a …

Economic Design Of Lot-By-Lot Acceptance Sampling By Attributes, Michael S. Wall

Retrospective Theses and Dissertations

Risk-based sampling plans have long been the accepted standards in the practice of acceptance sampling for quality control. Usually the economic consequences of a given sampling plan are assessed by experience and intuition at best. With the availability of high speed computers and well-proven statistical methods, economically-optimal sampling pl a ns can now be developed so that much of the guesswork is removed. This study first surveys these methods for deriving economically-optimal sampling plans. Then, recognizing the reluctance in government and industry to abandoning ris k-based design of sampling plans, a method is explored which poses a compromise between the …

Numerical Analysis Of The Resonant States Of Quantum Wells And Superlattice Devices, Alan Gilbert Whittaker

Retrospective Theses and Dissertations

This thesis is concerned with the development of a numerical model to describe the resonant states associated with quantum well and superlattice devices. A numerical method is described where the time-independent Schrodinger equation is represented as a series of simultaneous algebraic equations using the finite-element method. The eigenvalues for these equations are then found using a Sturm sequence, and the eigenfunctions subsequently calculated using a reverse iteration method containing orthogonality constraints. Simulations of specific devices are presented and compared with experimental results and good correlation is observed.

Comparison Of Graphical Design Methodologies, Pamela Stark Woodard

Retrospective Theses and Dissertations

The recent development of the Ada language by the Department of Defense and its required use within the Department of Defense for the development of embedded software systems has resulted in a need for better methods to represent Ada software designs. Graphical design techniques have long been used as software design and documentation aids. The use of graphical techniques to illustrate an Ada design can provide a clear, concise means to describe a complex software system. The purpose of this paper is to investigate several software design methodologies which incorporate graphical design notations. The specific software methodologies examined in detail …

High Resolution Monopulse Tracking, Larry Alan Young

Retrospective Theses and Dissertations

High Resolution Radar techniques are applied to the problem of resolving a multiple target array and locating its geometric center without the usual biasing toward the brightest targets. Monopulse radar techniques are combined with high resolution stepped frequency pulse train signal processing in an amplitude tracking radar.

A single pulse monopulse system's aimpoint is biased toward the brightest point targets in an array. However, by using a stepped frequency pulse monopulse radar, the cross range distance to each individual scattered may be found.

Unlike the single pulse monopulse system, the aimpoint is independent of the reflectivity of the targets. The …

Learning Curve Model For Interrupted Production, Behzad Zarkoob

Retrospective Theses and Dissertations

Traditionally the learning curve technique has been applied to the case of continuous production. In such cases the cost par unit declines by a constant or staged percentage due to the learning phenomenon. Although this technique has been an important management tool to predict cost and productivity, there are other factors that wil~ affect the learning curves and its forecasts. One of these factors is "forgetfulness," which is caused by program interruptions for a significant period of time. It is expected that due to the interruption a relearning process may have to take place. The objective of this report is …

Development Of A Bi-Directional Inference Engine Using An Object-Oriented Approach, Taha A. Sidani

Retrospective Theses and Dissertations

An inference engine is the mechanism by which an expert system program uses the domain specific information in the knowledge base to solve a problem at hand. Most of the current systems apply one of three control strategies to perform the reasoning process. These strategies are better known as forward chaining, backward chaining, and hybrid control. However, some of these systems restrict the user by confining him/her to use only the type of control provided. Hybrid systems infer using both forward and backward chaining. In either case, the user is limited to the method in which the knowledge engineer represented …