Digital Commons Network^™

Max/Min : A Novel Rank Order Based Filter Family, Raafat E. Kamel

Theses

In the early development of signal and image processing, linear filters were the primary tools. Their mathematical simplicity made them easy to design and implement. They also offered satisfactory performance in many applications. However, they show poor performance in other cases, such as image processing.

Nonlinear filtering offered a solution to these problems. Nonlinear filtering has undergone a lot development for a long time. Among the first known nonlinear filters was the median filter, which was proposed by Tukey. Median filter preserves signal or image details better compared to a linear filter. Later other nonlinear filters were developed, including median …

A Transputer Based Distributed Graphics Display, Ramana V. Kattula

Theses

The design of a transputer based graphics display is discussed. The problems associated with the single processor graphics systems are described. A solution based on multiple transputers is proposed. The transputer based graphics display described is a general purpose graphics system which can achieve any required compute performance and drawing performance without using special hardware. The display resolution and color depth can be enhanced as per the user requirements with little or no change in hardware.

Simulation And Analysis Of Integrated Lans For Hospital Environment, Naveen K. Verma

Theses

Hospitals generate a large number of data sets of different types and formats and it is required to integrate these data sets for their rapid and simultaneous communication in order for a better treatment of patients and to cut the escalating costs. A better approach to meet this requirement is to have a distributed system linked all together with a high capacity LAN using an efficient integration method.

This thesis begins by studying the characteristic feature and suitability of Queued Packet & Synchronous Exchange (QPSX) network architecture. The network models are simulated for QPSX, Ethernet and Token Bus networks for …

Landmark-Based Shape Recognition By A Modified Hopfield Neural Network, Kuowei Li

Theses

In this thesis, we introduce a new thethod to achieve partial shape recognition by means of a modified Hopfield neural network. To recognize partially visible object, we represent each object by a set of "landmarks." The landmarks of an object are points of interest relative to the object that have important shape attributes. Given a scene consisting of partially occluded objects, a model object in the scene is hypothesized by matching the landmarks of the model with those in the scene. A measure of similarity between two landmarks, one from a model and the other from the scene, is needed …

Decomposing Non-Product Form Queuing Lattices Through Simulated Annealing, Jr-Chin Lin

Theses

A random, heuristic search called Simulated Annealing is adapted to decompose the state transition lattice of Non-Product Form Queuing Models. Simulated Annealing Algorithm has been successfully applied to a number of optimization problem such as The Traveling Salesman Problem, Graph Partionning, Physical Computer Design, VLSI Chip Design, Image Processing,... etc. It has the advantage over other gradient descent techniques to solve the combinatorial problems. The solution can escape from local minimum by adding Boltzmann Distribution Factor to the algorithm. Most lattice of non-product form queuing models can be decomposed into Solvable Subsets through this algorithm, and solvable subset is the …

Computer Animation: The Animation Capabilities Of The Genigraphics 100c, Pamela Barth Stainback

Theses

None provided.

Performance Evaluation Of Consumer Electronic Bus, Sairaj R. Pakkam

Theses

This thesis describes the performance evaluation of the Consumer Electronic Bus proposed by the Electronic Industries Association. To study the behaviour of CEBUS under different traffic conditions, a simulation program was developed modelling the layer architecture of CEBUS. The CEBUS is based on the ISO/OSI model of layered architecture. The simulation results have shown that, when the throughput of the network is small, the delay is bounded for all messages of all priorities. As the throughput of the network increases, under the presence of more high priority messages, the lower priority messages get queued at their nodes. It is also …

Comparative Analysis Of Single And Double Dwell Acquisition Schemes, Gurinder Singh Ahluwalia

Theses

Single and double dwell pseudonoise (PN) acquisition systems are described, explained and analyzed. These systems are designed to synchronize a locally generated PN signal with a received PN signal of unknown phase in the presence of noise. The mean, variance and an approximate probability distribution function (PDF) of the acquisition time for the single and double dwell PN acquisition schemes is developed. Intuitively, the double dwell acquisition system should be superior to the single dwell system because of the ability to quickly dismiss incorrect cells and further verify probable hits. It is shown analytically that this is in fact true …

Decomposing Non-Product Form Queuing Lattices Through Genetic Algorithm, Wei Han

Theses

In this paper, a Genetic Algorithm technique is adapted to decompose the state transition lattice of a class of non-product form queueing models. Genetic Algorithms are search algorithms based upon the mechanics of natural genetics. They combine a survival-of-the-fittest among string structures with a structured, yet randomized, information exchange to form a search algorithm with some of the innovative flair of human search. While randomized, genetic algorithms are no simple random walk. They efficiently exploit historical information to speculate on new search points with improved performance. Here genetic algorithms is applied to a non-product queueing lattices optimization problem. Only the …

Scatterer Number Density Estimation For Tissue Characterization In Ultrasound Imaging, Hui Zhu

Theses

Ultrasound RF signal, backscattered from an inhomogeneous parenchymal tissue has the character of a random signal. It is the random fluctuating nature of this signal that is responsible for the speckle pattern observed in the images. These random signals, nevertheless, bear information related to the random scattering structure of the medium. Statistical moments of the signal can serve as feature parameters that are related to mean scatterer spacing in the random structure. However, such a feature is biased because the statistical nature of the RF signal depends, not only on the random tissue scattering structure, but also on the resolution …

Imagination Makes Things Perfect, Donna Lee Rollins

Theses

None provided.

Laser Diodes Incorporating Diffractive Features, Mark Meyers

Theses

Laser diode structures which incorporate diffractive features (such as linear gratings or focusing output couplers) have several advantages in terms of device performance and increased flexibility. In this paper the properties of distributed feedback (DFB) and distributed bragg reflector (DBR) laser diodes are compared with those of cleaved cavity fabry-perot type laser diodes. Analysis of the propagation of light in the waveguide formed by the GaAlAs/GaAs/GaAlAs heterostructure will reveal how the interaction of light with periodic variations in dielectric interface can provide the optical feedback neccessary for lasing to occur. The resulting laser light wavelength is significantly less sensitive to …

Transputer-Based Robot Controller, Wei-Chieh Chang

Theses

A cost-effective architecture for the control of robot manipulators based on functional decomposition of the equations of motion is described. The Lagrange-Euler( LE) and the Newton-Euler( NE) formulations are used for decomposition. According to real-time control criterion, the LE equations are not suitable for implementation using currently available hardware because the required number of computations is too high, even after taking the inherent parallelism into account. However, the recursive nature of the Newton-Euler equations of motion lend themselves to being decomposed to terms used to generate the recursive forward and backward formulations. A special architecture implemented on a network of …

Ornamentalism, Douglas B. Prickett

Theses

None provided.

Chemical Sensitization Of Tabular-Grain Emulsions In The Presence Of Sensitizing Dye, Weide Victor Yang

Theses

This thesis considers the role a spectral sensitizing dye plays in chemical sensitization for tabular-grain emulsions. Different approaches for introducing sensitizing dye have been chosen in conjunction with sulfur-thiocyanate-gold (S-SCNAu) chemical sensitization, 1. At the completion of nucleation (NUC) 2. At various precipitation completion points (pcp) a. At 35% pcp b. At 70% pcp c. At 80% pcp d. At 90% pcp e. At 100% pcp (i.e., at the beginning of Ostwald ripening) 3. Before chemical sensitization with varied digest addition sequences: Dye-SSCN- Au, Dye-SCN-S-Au 4. Conventionally: S-SCN-Au-Dye, i.e., dye introduced after chemical sensitization (control). It also considers what happens …

Mind States, Susan Grinols

Theses

None provided.

Using Drama To Teach Drug Prevention Objectives In The Tenth Grade Language Arts Classroom, Mary Jo Teets

Theses

The primary objectives of this language arts unit were (a) to show that drug prevention objectives could be integrated into the secondary language arts curriculum without taking away time allotted for regular course objectives, and (b) to show that drama was an effective teaching strategy to combine language arts and drug prevention objectives. A secondary objective was to produce a video that could be used as a drug prevention tool with junior high school students. A six day unit which was taught to sixty-two tenth grade students at Grandview R-II High School in Jefferson County, Missouri, centered around producing five …

Damage Effects To Si-Sio2 Structures Due To Reactive Ion Etching, Moshe D. Bunyan

Theses

This thesis presents the damage effects to the Si ? SiO₂ structures due to Reactive Ion Etching (RIE). The research was carried out on Si ? SiO₂ MOS capacitors which were fabricated using RIE and wet etch (Hydrofluoric acid etch (HFE)) Process. The experiment was carried out using CV technique and Ellipsometry. Various electrical parameters were measured from CV *curves of these MOS capacitors. It was observed that the CV curve obtained for the RIE etched sample showed considerable deviation from that of the control sample. This indicates the presence of excess of interface trap charge density which …

Garments As Living Sculpture, Cynthia Tokar

Theses

In my thesis of work, I was inspired by the changing seasons as reflected in nature. I chose the four seasons as a theme because I have always been intrigued by the different colors and textures that are reflected by nature in the different seasons. An interest in garments helped me decide how to apply this interest to my thesis. I have chosen to create garments which are both aesthetically and functionally sensitive to our human needs. By producing a variety of techniques and styles, I hope to appeal to clothing wearers everywhere. On October 13, 1989, 1 was flying …

Architecture And Art, David A. Baird

Theses

None provided.

Body Ornamentation, Barbara Heinrich

Theses

None provided.

The Influence Of The Position Of A Color Control Bar On A Form When Determining The Most Appropriate Location To Measure Variability In Solid Ink Density And Dot Gain Of A Printed Product, Kevin B. Leines

Theses

This study proposed to determine the most appropriate place to measure variability in dot gain and solid ink density on a form using color control bars. The study developed a form that entailed three GATF/SWOP, 133 line color control bars placed strategically at the lead, middle and trail edges of the sheet. The test set specific density standards to control to, and while these densities were being controlled, samples were obtained that represented a typical press run. Each of the control bar set-ups was treated as a separate press run, allowing the press operator to change the set densities to …

A Study Of The Accuracy Of Reproduction Of Measured Photography: A Method To Equate The Tonal Range Of The Color Transparency To The Tonal Of The Photomechanical Reproduction, Michael Grant Scala

Theses

The density range of a color transparency greatly exceeds the density range capacity of reproductions with ink on paper. It is therfore necessary to perform tone compression. Traditionally, tone compression is accomplished by the color separator and involves subjective decisions without input from the photographer. Tone reproduction of the final image is a result of image manipulation by different people in production who are not in communication with each other. Consequently, image quality may suffer and important image detail may be lost as a result of improper estimates.

Furniture From The Landscape, Gerard J. Alonzo

Theses

None provided.

Design And Analysis Of Movable Boundary Allocation Protocol, Karun Sekhri

Theses

The increasing digital communications traffic will require very high speed networks. The use of high communication speed increases the ratio between end to end propagation delay and the packet transmission time. This increase causes rapid performance deterioration and restricts the utilization of the high system bandwidth in broadcast channel based systems. Using several parallel channels in place of a single channel improves this ratio. For a given system bandwidth the total system capacity is increased by bandwidth division and parallel communication. FTDMA protocols have been suggested for the parallel channel network and these protocols are suitable for different loads. In …

Statistical Process Control For High Precision Deep Drawn Sheet Metal Parts, Sunil S. Shah

Theses

In today's world, industrial expertise has come to be judged in terms of the quality of the product. Good quality has become the ultimate aim in a manufacturing environment, which leads to many innovations for ease in the inspection of parts. In considering a metal working company like Hudson Tool & Die Company, a study of the various operations and the application of Statistical Process Control to the forming operations is performed using STORM software. Important characteristics have been carefully studied with regards to metal forming like uniform metal thickness, radius of the bend, depth of the drawing operation. In-depth …

Multiprocessor System Design Tutor : Expert System Approach, Rakesh Kamdar

Theses

To increase computational bandwidth and system resilience, integration of several microprocessors in a single system becomes necessary. The overall throughput and efficiency of such a system is directly dependent on the hardware and software interconnection supported by the basic microprocessor chip. Sometimes it becomes difficult to put together all the information for design criteria and all the design related formulas.

The approach made here is to continuously update the hardware and software information in the database related to a given microprocessor. This information can be accessed at any time for efficient design solution. Intel 80386 and Motorola 68020 microprocessors are …

A Study Of The Effects Of Weighting Matrices In Power System State Estimation, Yanshi Wang

Theses

The effects of weighting matrices that may be used in the Weighted Least Squares (WLS) method when applied to the problem of Power System State Estimation (PSSE) are studied. These weighting matrices include the one usually used in the literature and the one used in the utility PSSE programs

The performances of these weighting matrices are compared using the Monte Carlo simulation technique.

To test the performances of the weighting matrices, a PSSE program is developed, different performance indices for state comparison are defined, and many cases are studied.

Results show that the weighting matrix usually used in literature, 1/σ², …

A Micro-Based Machine Vision System, Hsueh-Chung Michael Feng

Theses

In this thesis, a low-cost general purpose machine vision system based on a personal computer of the PC-XT/AT family and an electronic camera controller based upon a Motorola 6811C11 single-chip microcontroller has been designed and implemented. This work is focused on image formation. The system supports a long distance camera-computer configuration. A picture editor, generic image manipulation software was designed and implemented. A single computer can supervise multiple cameras.

A Code Verification System For Ink Jet Printing, Daniel Liang Hsu

Theses

This paper describes system integration of a code verification system. The system utilizes a feature matching