Digital Commons Network^™

A Parallel Processing Architecture For Dqdb Protocol Implementation, Nilesh Vinubhai Gandhi

Theses

The high bandwidth transmission links, which have been provided by the advances of Fiber Optics Technology, reduce drastically the packet transmission times and place new demands on the nodal protocol processing. Segmentation and reassembly of packets, computation of checksums, introduction of source and destination addresses, etc., must be performed extremely fast in order to prevent node processing from becoming the bottleneck of the transmission. Parallel processing enables the execution of the previous tasks on multiple packets simultaneously and therefore has the potential of addressing the issue of fast node processing successfully. In this thesis we focus on the Medium Access …

Modeling Of Rapid Thermal Processing System By Finite Element Method, Helen Martynov

Theses

A finite element model for the Rapid Thermal Processing (RTP) system at NJIT was developed based on the software package MSC/NASTRAN. Based on this model, a thermal analysis of the 9" chamber, 3 zones (37 lamps) RTP system was conducted for various modes of system operation with the 6" silicon wafer temperature varying from 300°K to 1100°K. An open-loop control algorithm was developed in order to study the dependence of wafer temperature on time, position, and applied radiant heat distribution. It was shown that the non-uniformity in the radial temperature profile can be less than 3°C during wafer heating at …

Finite-Element Ray Tracing, Yong-Chun Liu

Theses

The interesting acoustic modeling problems often push the practical limits of full-wave models. For instance, in acoustic tomography one needs to be able to predict the propagation of an acoustic pulse for successive realizations of 31) environments. For these types of problems ray methods continue to be attractive because of their speed. Unfortunately, existing codes are prone to a number of implementation difficulties which often degrade their accuracy.

As a result most ray models are actually incapable of producing the ray theoretic result. We discuss a. new method for implementing ray theory that uses a. finite-clement formulation. This method is …

Evaluation Of Collision Properties Of Spheres Using High-Speed Video Analysis, Jian Yu

Theses

Experimental evaluation of the collision properties of spheres is performed using video image analysis techniques. A high-speed Kodak EktaPro1000 video camera is utilized to record a collision sequence between two spheres at 1000 frames/sec, and then the images are analyzed to calculate three dimensional translation and rotation before and after the collision. These quantities are used to compute the collision properties for a pair of one inch nylon spheres, i.e. the coefficient of friction, and the coefficients of normal and tangential restitution. The focus of the thesis is on image analysis techniques that provide high accuracy results even though the …

Rigorous Te Solution To The Staircase Model Of The Dielectric Wedge Antenna, Wan-Yu Chen

Theses

The rigorous TE solution to the staircase model of the dielectric wedge antenna is presented. The fundamental, even TE surface wave mode of the dielectric slab waveguide is taken to excite a dielectric wedge which is formed by symmetrically tapering the slab. The method of solution is based on Marcuse's step-transition method. Radiation patterns of power gain are presented which show increased maximum power gains and narrower main lobe beamwidths for longer wedges. For higher dielectric constant material, the main lobe beamwidth is increased. In all cases examined, negligible sidelobes were obtained.

Hardware Design For Jpeg And A Comparative Study Of Jpeg And Mpeg Image Compression Algorithms, Aravind Soundararajan

Theses

The complete PC-based hardware design along with the initialization and control software of the JPEG algorithm is presented in this thesis. The hardware could run in real-time to compress, decompress and display still frame images. LSI Logic JPEG chipset was used in the design. This is a dedicated chipset for the JPEG compression algorithm.

A simulation software was used for studying the performance of MPEG video compression algorithm. Various video test sequences were compressed through the codec simulation software and the resulting rate-distortion performance was calculated. These are compared with the performance of JPEG based image sequence compressor.

It is …

Scanning Ratios For Desktop Imaging, Mike Beaulieu

Theses

Users of desktop scanning technology are conscious about the quality the image detail reproduction. Repeatability and accuracy are based on certain standards. Established scanning procedures for charged couple device (CCD) desktop scan ners are primarily influenced by the Nyquist Criterion which states that an image must be sampled at twice the frequency of the line screen ruling that will be used to print the final image. These "rules of thumb" appear in many techni cal and trade publications that are consulted by the printing industry in order to insure the quality of printed products. Quality is not the only factor …

A Dsp Based General Self-Tuning Observer Controller, John F. Seward

Theses

This treatise presents an implementation of a General Self-Tuning Observer Controller (GSTOC) for adaptive velocity control using a TMS320C25 Digital Signal Processor (DSP). The GSTOC is a structure based on modern control state-space theories, such as Kalman filters used as steady state or time-varying optimal state estimators, full state feedback using pole placement or optimal control theory and parameter estimation techniques.

A Self-Timed Implementation Of The Bi-Way Sorter Systolic Array Processor, Mitchell Diamond

Theses

Self-timed circuits with an appropriate handshake control circuit can be used to replace the global clock in a VLSI chip. By replacing the global clock many problems which face designers have disappeared along with the clock. Some of these problems are due to clock skew and capacitance scaling with smaller feature sizes. The wire capacitance cannot scale below a certain limit due to two-dimensional effects, therefore the RC delays associated with the interconnect layers do not scale proportion.ally to the feature size. The resultant increase in wire delay makes it difficult to distribute a global clock at a high frequency. …

Synthetic Image Generator Model: Application Of Specular And Diffuse Reflectivity Components And Performance Evaluation In The Visible Region, Richard Stark

Theses

This study focused on the operation of the RIT Digital Imaging and Remote Sensing Lab's synthetic image generation (DIRSIG) software model in the 0.4 to 1.0 urn wavelength region. The overall intent was to create a baseline for future DIRSIG activity. This was achieved by modifying the infrared based software to account for the characteristics of visible energy, and then evaluating the model's overall performance. A modification was made to the model's radiance algorithm by dividing surface reflectivity into a combination of view angle dependent diffuse and specular components. Additionally a practical method was developed for generating these values. Performance …

Photolithography Model Parameter Extraction From In-Situ Measured Development Rates, Patrick G. Drennan

Theses

None provided.

Organometallics: (I) Synthesis Of A Macrocyclic Complex Praeseodymium And (Ii ) Effect Of Wilkinson's Catalyst On The Cleavage Of Cyclohexene Oxide By Borane, Carolyn Ruth

Theses

(I) The template synthesis and characterization of the complex of praeseodymium acetate from 2,6-diacetylpyridine and orthophenylenediamine was attempted. The attempted synthesis produced a green precipitate with a high melting point and poor solubility in organic solvents, unlikely characteristics for compound 1 seen on the page. This project was set aside due to the apparent failure to produce the desired compound. (II) The effect of Wilkinson's catalyst on the treatment of cyclohexene oxide with borane-THF at 72 for 5 1/2 hours was also investigated. Oxidation of the organoborane formed by both the catalyzed and uncatalyzed reactions produced cyclohexanol. Another significant product …

A Comparison Of Methods For Forming Multitemporal Composites From Noaa Advanced Very High Resolution Radiometer Data, Craig Laben

Theses

Processed satellite data from the Advanced Very High Resolution Radiometer (AVHRR) generally consists of earth imagery which is obstructed to some extent by cloud coverage. Cloud-free images of certain geographic locations are valuable for numerous remote sensing applications. One way of obtaining a cloud-free image of an area is by the generation of a multitemporal composite. This involves generating images from consecutive satellite passes and selecting cloud-free areas from each day. These cloud-free areas can be pieced together to form a composite image clear of any cloud coverage. A study was conducted in which different methods of forming multitemporal composites …

Channel Routing: Efficient Solutions Using Neural Networks, Taj-Ul Islam

Theses

Neural network architectures are effectively applied to solve the channel routing problem. Algorithms for both two-layer and multilayer channel-width minimization, and constrained via minimization are proposed and implemented. Experimental results show that the proposed channel-width minimization algorithms are much superior in all respects compared to existing algorithms. The optimal two-layer solutions to most of the benchmark problems, not previously obtained, are obtained for the first time, including an optimal solution to the famous Deutch's difficult problem. The optimal solution in four-layers for one of the be lchmark problems, not previously obtained, is obtained for the first time. Both convergence rate …

Automated Image-To-Image Rectification For Use In Change Detection Analysis As Applied To Forest Clearcut Mapping, Kaleen S. Moriarty

Theses

An automated approach to change detection analysis was developed for use in multi-temporal image comparisons. An algorithm was developed which enables the user to perform automatic image-to-image rectification. Manual registration techniques are utilized to register a reference image to a Universe Transverse Mercator map projection. Control points, or kernel images, are extracted from the rectified reference image and located automatically in the to-be-mapped images via mathematical correlation. A two windowed approach is used that requires an estimation of the location of the control point in the to-be-mapped image. This estimate is used to create a search area which is correlated …

Let Wildlife Live: A Computer Illustrated Calendar Of Endangered Species, Mark S. Sommers

Theses

None provided.

Synthetic Routes Towards Spin Probe-Grafted Copolymers, Christopher Mccarthy

Theses

Nitroxide spin labels can be useful as oxygen probes since the shape of the characteristic three line electron spin resonance (ESR) spectrum broadens in the presence of molecular oxygen. In order to use these probes in. vivo to measure oxygen content of tumors, contact of toxic nitroxides with tissues must be prevented. This study describes synthesis and characterization of several styrene/maleic anhydride copolymers containing grafted 2,2,6,6-tetramethyl-4-aminopiperidine-1- oxyl (TEMPO) spin probes. Infrared (IR) spectroscopy was used to determine the structure of the copolymers. ESR spectroscopy was used to contrast the free radical activity of the copolymer in an nitrogen-rich and oxygen-rich …

The Design Of A 10bit 15mhz Analog To Digital Convertor, Scott L. Tewinkle

Theses

A 10 bit 15Mhz Analog-to-Digital converter (ADC) has been designed using a novel three step conversion technique. Successive 4bit, 3bit, and 3bit flash cycles are done for a complete conversion. Each flash cycle uses 15 comparators even though the second and third cycles require only seven comparators. The eight extra comparators are used for 4LSB digital error correction. Since, the ADC requires more than one clock cycle for a complete conversion two parallel comparator banks are used to obtain the 15Mhz conversion rate. A test chip has been designed with a 2 micron, double metal, single polysilicon, nwell CMOS technology. …

Morphological Classification Of Noisy Shapes Via Exterior Granulometries, Yingchong Cheng

Theses

Shape classification via linear granulometric moments is examined for patterns suffering varying degrees of edge noise. It is seen that recognition is quite poor even for modest amounts of noise and remains poor even when the patterns are first filtered by a close-open filter. Recognition accuracy is greatly improved, for both unfiltered and filtered images, by employing exterior granulometries. These are constructed by applying the various linear structuring-element sequences to the corresponding linear convex hulls of the noisy patterns. The resulting granulometric distributions are then not corrupted by noise-induced probability mass at the left of the pattern spectrum, thereby greatly …

Personal Information System, Leonard Ko

Theses

None provided.

Design For Manufacturing: Performance Characterization Of Digital Vlsi Systems Using A Statistical Analysis/Inference Methodology, J. Ignacio Espinosa De Los Monteros

Theses

Design For Manufacturing (DFM) is a TQM methodology by which inherently producible products can be manufactured with high yields, short turnaround time and great flexibility. The key to the success of any DFM program lies in increased accuracy in the modeling of the process and product designs, product simulations and effective manufacturing feedback of key parametric data. That is, properly modeling and simulating designs with data which reflects current fabrication capabilities has the most lasting influence in the performance of products. It is this area that is tackled in the methodology developed hereafter; a method by which to feedback and …

Character Recognition Of Optically Blurred Textual Images Using Moment Invariants, Adam Hanson

Theses

Statistical moment invariants were used to generate a feature space for classifying images of text characters. The feature vector of a given letter is invariant to changes in scale, position, rotation, and contrast in the image. Test character images were generated by simulated optical blurring. Images were classified by calculating the distance between the feature vector of a given test character and that of each reference character. The test character was identified as the reference character for which the distance between feature vectors is a minimum. Significantly blurred characters were classified correctly using this method.

Investigation Into Optimal Rh(Iii) Deopant Placement In Silver Bromide Emulsions, David A. Telep

Theses

An optimal rhodium (III) doping scheme for silver bromide emulsions was sought which maximized emulsion speed loss, emulsion contrast and coated emulsion stability. Experimental results showed that the photographically active rhodium complex must be co-precipitated with the silver bromide in order to achieve a sensitometric modification of the final emulsion. This dopant induced sensitometric modification was not stable and decayed with time.

Cullet, Charles Sorrels

Theses

This paper discusses a series of five sculptures that are now five and one-half years old. Today these sculptures are scattered and in some cases gone, but the goals and the decisions which shaped their creation in 1986 and 1987 are still fresh in my memory. They were important experiments for me, and I carry them with me today. I would not claim these sculptures defined me as the artist I am now, but they do define me as the artist I was then. And to that extent, my understanding of myself is enriched by this thesis work. In 1986 …

Comparison Of Heart Rate With Chest Wall Vibrations, Kofi M. Arbuah

Theses

A study is done using a Microwave Interferometer as a computer-assisted non-invasive cardiopulmonary monitor. The Microwave Interferometer is used to record the mechanical vibration of the anterior chest wall by recording the velocity of the displacement of the chest wall. The objective is to first, record mechanical vibrations of the anterior chest wall at different heart rates, and second, attempt to identify the relation between heart rate and chest wall vibration.

The system uses two channels, the first signal produced by the Microwave Interferometer is a record of the velocity of the displacement of the chest wall caused by the …

Classification Of Patterns In Eeg Recordings : A Comparison Of Back-Propagation Networks Vs. Predictive Autoencoder Networks, Brian Armieri

Theses

Recent research exploring the use of neural networks for electro-encephalogram (EEG) pattern classification has found that a three-layer back-propagation network could be successfully trained to identify high voltage spike-and-wave spindle (HVS) patterns caused by epileptic seizures (Jando et. al., in press). However, there is no reason to predict that back-propagation is the best possible network architecture for EEG classification. A back-propagation neural network and a predictive autoencoder neural network were compared to determine which network was better at correct classifying both HVS and non-HVS patterns.

Both networks were able to classify 88%-89% of all patterns using a limited set of …

Power Consumption In Single-Phase Agitated Vessels Provided With Multiple Impellers, Gwo-Ming Chang

Theses

A significant amount of data can be found in the literature on power consumption of single-impeller agitation systems. However, little and incomplete information is available for power consumption in multiple-impeller systems. Therefore, the main objective of this study is to experimentally determine the power consumed by multiple impellers in mixing vessels as a function of impeller type, impeller off-bottom clearance, impeller spacing, and agitation speed.

In this work, the power dissipated by combinations of one, two or three impellers of either identical types or different types was studied. The power drawn by each individual impeller was measured by means of …

A Review Of Acetabular Prostheses For Total Hip Arthroplasty, Jennifer Anne Citarella

Theses

This study explores the evolution, design, and clinical progress of contemporary prostheses used in orthopaedic reconstruction of the socket of the hip joint. A literature search was performed to study acetabular implants, as used in total hip arthroplasty. The history of the design of these implants is chronicled. Next, the anatomy of the acetabular region and the surgical technique performed to replace the hip socket are presented. A comprehensive discussion of the design features, rationale, and clinical results for commercially available cemented and cementless prostheses follows.

Hydroxyapatite, a bioceramic which has just recently been approved for applications in total hip …

Modern Techniques Used To Improve A Hearing Conservation Program In A Power Generating Plant, Eilyn Fabregas

Theses

A noise survey was conducted on the pump floor of a power generating plant, which included measuring noise levels at 261 areas of the floor (6,000 square feet) and the employees' noise doses, or 8-hour time-weighted average (TWAs). The noise levels of the 261 areas were recorded using a Sound Level Meter, and the noise doses (i.e., TWAs) were measured using a noise Dosimeter. It was found that both noise levels and TWAs were higher than the OSHA's permissible exposure limit (PEL) of 90 dBA and the action level of 85 dBA. According to the data gathered, it was determined …

Study Of Emg Frequency Behavior, Mark Steven Fiedorowicz

Theses

It has previously been determined that the power spectral density of an electromyogram shifts towards lower frequencies over time during an isometric contraction. In this study the power spectral density curve was examined to see if changes would occur over a period of time as a subject walked on a treadmill at various speeds. The shapes of the power spectral densities recorded from the soleus shifted to the lower frequencies over time. The parameters associated with the curves showed trends. One of the parameters, zero crossing, demonstrated adaptation and fatigue in all four patients, for the first portion of the …