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Theses/Dissertations

Electronic Theses and Dissertations

2003

Engineering

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Formation Of Flexible Manufacturing Cells With Human Lifting Consideration., Setiadi. Lesmana Jan 2003

Formation Of Flexible Manufacturing Cells With Human Lifting Consideration., Setiadi. Lesmana

Electronic Theses and Dissertations

Manufacturing companies are being forced to design and organize their manufacturing operations to survive the competition and to satisfy the customers' needs. Cellular Manufacturing Systems (CMS) have been considered as an important step in achieving these objectives. In this research, mixed integer programming models are developed. The objective of the models is to minimize the total cost function associated with the formation of the manufacturing cells, while considering the human limitation of manual lifting tasks. In addition, the multi period models consider machine relocation and/or manpower level change to balance machine and operator workload throughout the production periods. The ...


Viscometric Properties Of Lubricating Oils In The Presence Of Pour-Point Depressants And Viscosity-Index Improvers At Different Temperature Levels., Sheila. Kashkooli Jan 2003

Viscometric Properties Of Lubricating Oils In The Presence Of Pour-Point Depressants And Viscosity-Index Improvers At Different Temperature Levels., Sheila. Kashkooli

Electronic Theses and Dissertations

The objective of this work is to study the effect of polymeric additives upon the viscosity of two different base stocks over the temperature range -25°C to 10°C. The two base stocks being, (i) Imperial oil's MXT-5 base stock, and (ii) Chevron oil's Group III base stock. Four different viscosity-index improvers at five concentrations were employed. The viscosity-index improvers' behavior was studied in presence of pour-point depressants. The viscosity-index improvers being: hydrogenated diene copolymer (HDP) [C95-209], dispersant olefin copolymer (DOCP) [C96-309], olefin copolymer (OCP) [C98-129], polymethylacrylate (PMA) [C93-009]. The pour-point depressants are: acryloid 154-70 and paraflow ...


A 2-Digit Multidimensional Logarithmic Number System Filterbank Processor For A Digital Hearing Aid., Hongbo (Jennifer). Li Jan 2003

A 2-Digit Multidimensional Logarithmic Number System Filterbank Processor For A Digital Hearing Aid., Hongbo (Jennifer). Li

Electronic Theses and Dissertations

This thesis addresses the design, implementation, and evaluation of a filterbank for digital hearing aids using a Multidimensional Logarithmic Number System (MDLNS). Hearing loss is a function of both frequency and input level. In a typical digital hearing instrument, the hearing loss compensation is performed by separating the incoming sound into several frequency bands which are then compressed to allow the amplification of low level signals while maintaining the amplitude of high level signals. The demands of low power consumption and small size have led to a number of advances in algorithms, semiconductor technologies and system architectures for completely-in-canal (CIC ...


The Effect Of Localized Muscle Fatigue On Tibial Impact Acceleration., Janice Marie. Flynn Jan 2003

The Effect Of Localized Muscle Fatigue On Tibial Impact Acceleration., Janice Marie. Flynn

Electronic Theses and Dissertations

Tibial impact acceleration measured during running is known to increase with general body fatigue. The purpose of this study was to determine if localized muscle fatigue of the shank muscles would also cause an increase in peak tibial acceleration. The human pendulum system was used to control impact velocity and joint angle. There were 24 women participating in the study: 12 between the ages of 20--25, and 12 between 50--60 years. Each lay supine on the pendulum, and their unshod dominant heel was impacted into a vertical force plate with a velocity between 1--1.15 m/s, and a force ...


The Effect Of Turbulence On Forced Convection From A Heated Horizontal Circular Cylinder., Christopher. Sak Jan 2003

The Effect Of Turbulence On Forced Convection From A Heated Horizontal Circular Cylinder., Christopher. Sak

Electronic Theses and Dissertations

The effects of free stream turbulence integral length scale and turbulence intensity (root-mean-square stream-wise component of velocity fluctuation) on the rate of forced convective heat transfer from a heated horizontal circular cylinder in a cross flow of air were investigated experimentally. An internally heated 5.1 cm (2&inches;) diameter aluminium cylinder was placed horizontally in an 86 cm wide by 66 cm high (34&inches; by 26&inches;) wind tunnel. The power supplied by the internally embedded heater was kept constant in order to maintain uniform surface temperature. A perforated plate was placed at the entrance to the test section to generate ...


Phoneme-Based Speech Recognition Using Self-Organizing Map., Xiaofeng. Dong Jan 2003

Phoneme-Based Speech Recognition Using Self-Organizing Map., Xiaofeng. Dong

Electronic Theses and Dissertations

Automatic speech recognition by machine is a challenging task for man-machine communications. Because speech waveform is nonlinear and variant, a speech recognition algorithm requires much intelligence and an ability to accommodate variations. In this thesis, a hybrid speech recognizer based on self-organizing map (SOM) and fuzzy neural network (FNN) is proposed. The SOM is used to obtain the optimal phoneme response patterns of speech signal by Viterbi search algorithm and the FNN is applied for the recognition matching of these 2D speech response patterns on the SOM to fulfill the speech recognition tasks. Experiment results show that this hybrid speech ...


Piles Embedded In Soft Clay Located Below The Water Table Subjected To Lateral Cyclic Loadings: Sensitivity Analysis., Deni Gunawan. Priyanto Putro Jan 2003

Piles Embedded In Soft Clay Located Below The Water Table Subjected To Lateral Cyclic Loadings: Sensitivity Analysis., Deni Gunawan. Priyanto Putro

Electronic Theses and Dissertations

This study presents the theoretical formulation and numerical investigations of sensitivity analysis of laterally loaded piles embedded in soft clay located below the water table. Single piles with various lengths and boundaries subjected to cyclic lateral forces and bending moments are analyzed. The groups of 3 x 3 piles with various spacing (2D, 3D, 4D, and 5D) are also analyzed in this study. For single piles, the pile structure is considered as one-dimensional beam and the supporting soft clay is defined by means of p-y model. For groups of piles, the pile members are considered as one-dimensional beams and the ...


High-Performance Mortar Reinforced With Short Carbon Fibers., Md. Safiuddin Jan 2003

High-Performance Mortar Reinforced With Short Carbon Fibers., Md. Safiuddin

Electronic Theses and Dissertations

The aim of the work reported in this thesis was to evaluate the performance of carbon fiber reinforced mortar in respect of workability, strength, impact resistance, toughness, durability, and cost-effectiveness. Laboratory experiments were carried out to investigate the properties of both fresh and hardened mortars reinforced with short carbon fibers and to optimize the mix with sufficient workability, good strength, superior impact resistance, enhanced toughness, and excellent durability at reasonable cost. Experimental investigation was carried out at the Concrete Laboratory of the University of Windsor. Five different types of mortar were taken under study including the control mortar based on ...


Energy Absorption And Load Management Characteristics Of Aluminum Foam-Filled Braided Tubes., Christopher Richard. Powell Jan 2003

Energy Absorption And Load Management Characteristics Of Aluminum Foam-Filled Braided Tubes., Christopher Richard. Powell

Electronic Theses and Dissertations

The work in this thesis presents the test results of an energy absorber that functions under tensile loading. Unlike conventional energy absorbing devices that function in compression, the aluminum foam filled braided tube design has the capability of absorbing energy in tension under quasi-static and dynamic loading. A series of quasi-static tests were performed with various aluminum foam densities to understand the relationship between foam density and energy absorption. It was determined from an analysis of the data that a linear relationship exists between foam density and energy absorption per unit volume of aluminum foam. A numerical model was developed ...


Fundamentals And Process Modeling Of Supersonically Induced Mechanical Alloy Technology (Simat(Tm)) For Engine Production., Evgeny. Leshchinsky Jan 2003

Fundamentals And Process Modeling Of Supersonically Induced Mechanical Alloy Technology (Simat(Tm)) For Engine Production., Evgeny. Leshchinsky

Electronic Theses and Dissertations

Conventional Metal Powder Coatings, designed to obtain anti-corrosive, wear and thermal resistant properties, are studied and their properties are analyzed. The capabilities of the Supersonically Induced Mechanical Alloy Technology are investigated with the purpose to enhance the surface strength and durability, simplify the deposition procedure and increase service time. A new spray deposition process is shown and compared with other different methods of Metal Powder Coating deposition. A new method is developed that is less expensive and operates with similar load mechanisms on powder particles. High strain rate deformation can be easily studied by special powder compaction. In this method ...


A Reconfigurable Digital Multiplier Architecture., Pedram. Mokrian Jan 2003

A Reconfigurable Digital Multiplier Architecture., Pedram. Mokrian

Electronic Theses and Dissertations

The recent growth in microprocessor performance has been a direct result of designers exploiting decreasing device feature sizes, while at the same time deepening the depth of pipelines. As transistor sizes continue to shrink, the traditional gains associated with smaller feature sizes will be degraded due to the adverse effects of wire scaling. The consequences of technology scaling on circuit performance have recently become a topic of significant importance, especially in arithmetic circuitry such as digital multipliers, which exhibit highly irregular interconnections. A digital multiplier architecture will be introduced that alleviates some of the problems associated with interconnect scaling, in ...


A Systems Analysis And Design Approach For Modelling Of Participatory Manufacturing Systems., Ruth Jill. Urbanic Jan 2003

A Systems Analysis And Design Approach For Modelling Of Participatory Manufacturing Systems., Ruth Jill. Urbanic

Electronic Theses and Dissertations

The goal of this research was aimed at understanding the effects of human worker attributes within the manufacturing system environment; hence, a model is needed to provide insights into the sensitivities of a manufacturing system. To this end, a framework has been developed which is valid for different perspectives and environments. A matrix methodology has been created that assesses the three levels of manufacturing complexity: product complexity to process complexity and operational complexity. The systematic approach has lead to the development of an objective measure of complexity, which can be used to "mathematically" show tradeoffs at each level. A model ...


Algorithms For Motion Estimation., Songtao. Huang Jan 2003

Algorithms For Motion Estimation., Songtao. Huang

Electronic Theses and Dissertations

This thesis presents several block matching techniques which are utilized for motion estimation in video coding. Among these algorithms the full search algorithm is known for its superiority in the performance over the other matching techniques; this method however requires an enormous computation costs. There are reported techniques in the literature which yield sub-optimal solutions. These are discussed in this thesis while another three efficient motion estimation algorithms for different applications are developed and presented in this thesis. The main objective of these proposed algorithms is to reduce the computation cost while maintaining the performance. Experimental results with a large ...


An Object-Oriented Analysis Technique For Developing Object-Oriented Simulations In Silk., Lia. Zannier Jan 2003

An Object-Oriented Analysis Technique For Developing Object-Oriented Simulations In Silk., Lia. Zannier

Electronic Theses and Dissertations

Simulation is very popular as an analysis tool for complex systems. A new paradigm shift towards object oriented simulations is hoping to make simulations even more powerful and accessible. However, in order for those not familiar with object oriented techniques to join this shift, methods must be developed for them to build object oriented simulations, until they acquire an understanding of this programming paradigm. This is an attempt to develop a procedure for just such novice model builders. This thesis begins with some background on object oriented paradigm concepts. It then provides an overview of several different object oriented analysis ...


Analysis Of Circular Geogrid-Reinforced Soil-Steel Bridge., Andre John Kendall. Bom Jan 2003

Analysis Of Circular Geogrid-Reinforced Soil-Steel Bridge., Andre John Kendall. Bom

Electronic Theses and Dissertations

A finite element analysis, by means of ABAQUS, has been undertaken to study the effects of inserting geogrid layers in the soil cover of a circular soil-steel bridge with a diameter of 7.6 m. Two loads are applied to the soil-steel bridge: gravity, as well as a truck load defined by the Canadian Highway Bridge Design Code design truck. Because experimentation and design of geogrids involve the application of a strip load, it is necessary to apply a strip load at the soil surface. Therefore, the rear two axles of the truck, separated by 1.2 m, are the ...


Automatic Localization Of Craniofacial Landmarks Of Cephalograms Using Artificial Neural Networks., Idris S. El-Feghi Jan 2003

Automatic Localization Of Craniofacial Landmarks Of Cephalograms Using Artificial Neural Networks., Idris S. El-Feghi

Electronic Theses and Dissertations

In modern orthodontic practice, a great reliance is placed on objective and systematic methods of characterizing craniofacial forms, using measurements based on a set of agreed upon points known as craniofacial landmarks. Lateral skull x-ray images are usually used in cephalometric analysis to provide quantitative measurements of the head. Accurate location of those landmarks forms the basis for what is known as cephalometric evaluation. Distance and angles among these landmarks are compared with normative values to diagnose a patient's deviations from ideal form, evaluate the craniofacial growth and measure the effect of the treatment. Because of the large variability ...


Design Of Iir Filters With Canonical Signed-Digit (Csd) Coefficients Using Genetic Algorithms., Li. Liang Jan 2003

Design Of Iir Filters With Canonical Signed-Digit (Csd) Coefficients Using Genetic Algorithms., Li. Liang

Electronic Theses and Dissertations

In this thesis, an optimization method is used in the design of 1-D IIR digital filters, doubly complementary filter pairs and 2-D IIR digital filters. This method uses genetic algorithm (GA) to minimize the mean square error between the desired and the designed filter responses in order to calculate the coefficients of the filter's transfer function. The 1-D IIR filters are designed using cascade structure, and constraints are imposed on the coefficients of the denominator polynomials to ensure stability. In the one-dimensional case, the method is also used to design doubly complementary filter pairs, in which case two filters ...


0.18 Micron Cmos Ip Core Design And Methodology., Joseph Steven. Schrey Jan 2003

0.18 Micron Cmos Ip Core Design And Methodology., Joseph Steven. Schrey

Electronic Theses and Dissertations

When working with 0.18mum or smaller CMOS technologies, current larger technology architectures are not easily scaled and subject to short channel effects. As a result, changes in architecture and/or unconventional transistor sizing must be done. The voltage comparator that has been designed consists of (13) transistors to form the following architectures; a differential input pair, a current mirror and a rail-pulling output stage. Special transistor sizing has been used in the current mirror biasing stage to produce a constant current source for biasing of the input transistors, overcoming the problems of non-constant current and non-constant transconductance due to ...


A Class Of Linear Phase Iir Digital Filters Design., Tao. Dai Jan 2003

A Class Of Linear Phase Iir Digital Filters Design., Tao. Dai

Electronic Theses and Dissertations

Digital IIR filters find wide applications in fields such as speech processing, image processing and noise/echo cancellation. In recent years, the design of linear phase IIR filter becomes a very hot issue of research interest. As we know, FIR filters designed to approximate a magnitude response that has a narrow transition band between the passband and the stopband usually require a large number of multipliers and they have a large delay also. Hence we prefer to IIR digital filters that have less number of multipliers than their corresponding FIR counterparts but one of disadvantages is that an IIR filter ...


Vision-Guided Multiple Planar Object Recognition And Tracking., Shahed. Shahir Jan 2003

Vision-Guided Multiple Planar Object Recognition And Tracking., Shahed. Shahir

Electronic Theses and Dissertations

In order to minimize the cost for any improvement or changes in manufacturing products, a flexible manufacturing system is necessary. To do so, robots should be empowered with equipment like vision sensors, which can work as human eyes for robots. A tracking vision sensor consists of a CCD camera, data acquisition, preprocessing, recognition and tracking modules. In this thesis, a design methodology for invariant recognition-based object tracking is proposed, which can potentially be used for implementation of either vision sensors or tracking vision sensors. The performance of Invariant Recognition-based object tracking to a large extent depends on the object recognition ...


Speech Analysis And Synthesis Based On Arma Lattice Model., Min. Wang Jan 2003

Speech Analysis And Synthesis Based On Arma Lattice Model., Min. Wang

Electronic Theses and Dissertations

The research documented in this thesis presents a pitch synchronous speech analysis and synthesis system using an ARMA (auto regressive moving average) lattice filter. The LP (linear predictive) model is, by far, the most widely used speech production model in speech processing. A well-known drawback with the LP model is that it ignores the effect of the nasal cavity. The mismatch between the model and the vocal tract becomes severe for nasal sound production and leads to poor synthesized speech. The nasal tract effect can be included in the speech production model by representing the vocal tract with an ARMA ...


Simulating The Plenoptic Camera., Arash. Razavi Jan 2003

Simulating The Plenoptic Camera., Arash. Razavi

Electronic Theses and Dissertations

This thesis presents the simulation of a CCD based camera called the Plenoptic Camera. Plenoptic Camera is a novel single lens camera capable of capturing 3D information of the scene and is used to find the depth of the objects. The main concept behind the design of this camera lies in the fact that light which passes through the lens of a camera is quite rich in information which regular cameras are not designed to take advantage of. The plenoptic camera keeps track of the 3D information of the light rays by distributing these rays over a two dimensional array ...


Siphon Removal Of Cohesionless Materials., Syeed Mahbub. Ullah Jan 2003

Siphon Removal Of Cohesionless Materials., Syeed Mahbub. Ullah

Electronic Theses and Dissertations

This thesis discusses the removal of cohesionless sediments by siphoning. A significant part of this study involves the analysis of equilibrium scour hole dimensions under different siphon flow characteristics. Scour holes of the sediments were formed by a siphon tube of three different sizes (9.65, 13.86 and 20.4 mm) positioned vertically at different positions relative to the surface of the sand bed. A total of 174 tests were performed, where the position of the tube ranged from 101.6 mm below the original bed to 6.4 mm above it. The latter part of the study investigates ...


Strength Of Bolted Ring-Type Connections Of Solid Round Leg Members Of Guyed Communication Towers., Lihong. Shen Jan 2003

Strength Of Bolted Ring-Type Connections Of Solid Round Leg Members Of Guyed Communication Towers., Lihong. Shen

Electronic Theses and Dissertations

The objective of the investigation is to study the strength of bolted ring-type connections used for solid-round leg members of all-welded steel towers subjected to tensile loads and to determine whether the current practice of ignoring the eccentricity of the connection can be justified or not. The load carrying capacity and maximum gap were determined experimentally and by finite element analysis. A total of eighteen specimens divided into three groups were tested. Group 1 consisted of six specimens of 25.4 mm (1.0 in.) leg size and 22.2 mm (7/8 in.) bolt size with no girls, group ...


Strengthening Of Reinforced Concrete Beams Using Innovative Ductile Composite Fiber-Reinforced Polymer Systems., Wael Fathy. Ragheb Jan 2003

Strengthening Of Reinforced Concrete Beams Using Innovative Ductile Composite Fiber-Reinforced Polymer Systems., Wael Fathy. Ragheb

Electronic Theses and Dissertations

Although the technique of external strengthening of reinforced concrete beams using externally bonded Fiber Reinforced Polymer (FRP) materials has been established as an effective tool for rehabilitating and strengthening reinforced concrete beams, it is still suffering from some drawbacks. A significant part of these drawbacks is attributed to the characteristics of currently available FRP strengthening systems. This study deals with the development and evaluation of the effectiveness of two innovative ductile FRP systems for flexural/shear strengthening of reinforced concrete beams. The systems are fabrics that are hybrid of glass and carbon fibers and designed to have the potential to ...


Submergence Effects On Local Scour., Md Rajib. Ahsan Jan 2003

Submergence Effects On Local Scour., Md Rajib. Ahsan

Electronic Theses and Dissertations

The study discussed herein focuses on the local scour created in a cohesionless sand bed by a plane turbulent wall jet with varying levels of submergence from 1 to 20. From the observations of 40 experiments the study reveals that the formation of unstable scour processes, which can be short and long-term in nature, depends on the water depth available above the mound apex for a given initial jet velocity. In case of stable scour process, the growth of the scour hole dimensions follows a linear relation with the logarithm of time beyond which the rate of change in the ...


The Addition Of Hydrogen And Oxygen To A Gasoline-Fuelled Si Engine To Enhance Combustion And Reduce Emissions., Tina. D'Andrea Jan 2003

The Addition Of Hydrogen And Oxygen To A Gasoline-Fuelled Si Engine To Enhance Combustion And Reduce Emissions., Tina. D'Andrea

Electronic Theses and Dissertations

Automobiles have become an essential part of our economy and provide a convenience that most have become dependent on, however they have also had a dramatic impact on our health and environment. As a result there is an incentive to find ways to more efficiently use conventional fuels and decrease emissions while alternative fuels and vehicles are being developed. This research involved studying the effects of adding small amounts of hydrogen and hydrogen and oxygen to a gasoline fuelled spark ignition (SI) engine. The hydrogen and oxygen were added in a ratio of 2:1, mimicking water electrolysis products. It ...


A Digital Tester Architecture For A System-On-Chip Implementation., Rashid. Rashidzadeh Jan 2003

A Digital Tester Architecture For A System-On-Chip Implementation., Rashid. Rashidzadeh

Electronic Theses and Dissertations

This thesis presents the development of an Intellectual Property (IP) core for a System-on-Chip (SoC) implementation of an integrated circuit tester. The resulting realization is called a Tester-on Chip (ToC). The ToC IP core is used in conjunction with a microelectromechanical (MEMS) interface that provides the necessary connectivity between the tester circuitry and the Device Under Test (DUT). Instead of using traditional Automatic Test Equipment (ATE) that includes a complex external test head, the DUT is placed in a MEMS fixture or socket and spring loaded MEMS contacts are used to probe the DUT as required. The ToC implementation can ...


A Mems Acoustical Sensor Array And Associated Micropackage., Sazzadur Chowdhury Jan 2003

A Mems Acoustical Sensor Array And Associated Micropackage., Sazzadur Chowdhury

Electronic Theses and Dissertations

This thesis develops the design methodology and fabrication procedures for a MEMS-based square planar acoustical sensor microarray for use in a hearing instrument to improve speech intelligibility in noisy and reverberant environments. The proposed microarray offers the potential of controlled directional sensitivity with a reasonably constant beamwidth over the audio frequency range when used in conjunction with an appropriate digital signal processor. The microarray consists of nine identical square-shaped capacitive-type acoustical sensors in a 3 x 3 planar layout and has a footprint area of 4.6 x 4.6 mm2 . Each sensor has a sensitivity of 10.3 mV ...


A Mixed-Signal Feed-Forward Neural Network Architecture With On-Chip Learning In Cmos 0.18 Microns., Mitra. Mirhassani Jan 2003

A Mixed-Signal Feed-Forward Neural Network Architecture With On-Chip Learning In Cmos 0.18 Microns., Mitra. Mirhassani

Electronic Theses and Dissertations

One of the main characteristics of the neural networks is their high number of interconnections between the neurons through synaptic multipliers. Interconnections occupy large area and increase the circuit complexity which limits the size of the fully parallel network. To implement large size networks, time-multiplexing should be used. Two new mixed-signal time-multiplexed architectures are proposed for on-chip mixed-signal neural networks. MRIII is used for training the network which is more robust to mixed-signal designs. The problem of node addressing and routing is solved by performing the operations in current mode. The architectures are simple and compact and learning is performed ...