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The Performance Of Asynchronous Cooperative Diversity With Sic Receivers, Harish Palakurthi
The Performance Of Asynchronous Cooperative Diversity With Sic Receivers, Harish Palakurthi
Graduate Theses, Dissertations, and Problem Reports (ETD)
The multiple-input multiple-output (MIMO) antenna systems are well known for achieving the higher spectral efficiencies and improving the link reliability in wireless communications. But the use of multiple antennas in a cellular uplink is impractical due to the size constraints of the mobile device. The potential solution which was used is to exploit the user cooperation to create a virtual antenna array. In this paper we investigate the cooperative diversity in an asynchronous code-division multiple-access (CDMA) uplink by taking inter-user non-orthogonality (allocation of non-orthogonal channels to multiple users) into consideration.;Most the previous research work assumes the use of the inter-user …
Real-Time Acquisition Of Multi-View Face Images To Support Robust Face Recognition Using A Wireless Camera Network, Srikanth Parupati
Real-Time Acquisition Of Multi-View Face Images To Support Robust Face Recognition Using A Wireless Camera Network, Srikanth Parupati
Graduate Theses, Dissertations, and Problem Reports (ETD)
Recent terror attacks, intrusion attempts and criminal activities have necessitated a transition to modern biometric systems that are capable of identifying suspects in real time. But real-time biometrics is challenging given the computationally intensive nature of video processing and the potential occlusions and variations in pose of a subject in an unconstrained environment. The objective of this dissertation is to utilize the robustness and parallel computational abilities of a distributed camera network for fast and robust face recognition.;In order to support face recognition using a camera network, a collaborative middle-ware service is designed that enables the rapid extraction of multi-view …
Time-Dependent Performance Of Buried Pipes In A Consolidating Soil Medium, Laura A. Sesack
Time-Dependent Performance Of Buried Pipes In A Consolidating Soil Medium, Laura A. Sesack
Graduate Theses, Dissertations, and Problem Reports (ETD)
Buried pipes are used for several applications, including water conveyance, highway drainage, and the transport of sewage. Throughout the years, it has become increasingly popular to use pipes made of thermoplastic materials due to ease of fabrication, resistance to chemical corrosion, light weight, and low cost. The objective of this research was to investigate the deformations of buried double-corrugated high-density polyethylene (HDPE) and solid-wall polyvinylchloride (PVC) pipes surrounded by a consolidating soil medium. The finite element method was used to calculate the pipe deflections throughout a time period of fifty years. Combined influence of creep and soil consolidation was considered …
Development Of Surface Micromachined Aluminum Nitride Air-Bridges For Piezoelectric Mems/Nems Applications By Metal Organic Vapor Phase Epitaxy Techniques, Sridhar Kuchibhatla
Development Of Surface Micromachined Aluminum Nitride Air-Bridges For Piezoelectric Mems/Nems Applications By Metal Organic Vapor Phase Epitaxy Techniques, Sridhar Kuchibhatla
Graduate Theses, Dissertations, and Problem Reports (ETD)
Group III-nitrides have attracted considerable attention for piezoelectric Micro/Nano electromechanical (MEMS/NEMS) applications due to their excellent bio compatibility, well developed growth techniques for high quality thin films and structural stability at high temperatures when compared to the commonly used piezoelectric metal oxides. Among the group III-nitrides Aluminum Nitride (AlN) possess superior material properties such as highest piezoelectric coefficient and good mechanical properties. Growth techniques for fabricating group III-nitride MEMS/NEMS by metal organic vapor phase epitaxy (MOVPE) techniques have involved sacrificial layers such as epitaxial group III-nitrides/ alloys, nanocrystalline films and porous interlayers. However, the material properties of the MOVPE grown …
Department Chairs' Perceptions Of Part-Time Faculty Status In Maryland Public And Private Higher Education Institutions, Daniel L. Moorehead
Department Chairs' Perceptions Of Part-Time Faculty Status In Maryland Public And Private Higher Education Institutions, Daniel L. Moorehead
Graduate Theses, Dissertations, and Problem Reports (ETD)
The growing use of part-time, non-tenure track faculty in higher education has become a nationwide phenomenon. The college-teaching part-time instructor is one who is working for low pay, has little job security, and has few benefits. College part-time instructors' employment is in a contingent state. They do not have the job protection provided to tenured professors because they are usually hired for only the upcoming term with no guarantee of being hired for any future terms.;The purpose of this study was to describe the status of part-time faculty in Maryland public and private four-year colleges and universities as perceived by …
Modeling Of Heat Transfer And Reactive Chemistry For Particles In Gas-Solid Flow Utilizing Continuum-Discrete Methodology (Cdm), Jordan M. H. Musser
Modeling Of Heat Transfer And Reactive Chemistry For Particles In Gas-Solid Flow Utilizing Continuum-Discrete Methodology (Cdm), Jordan M. H. Musser
Graduate Theses, Dissertations, and Problem Reports (ETD)
A comprehensive multi-phase flow model requires coupled hydrodynamics, boundary conditions, heat and mass transfer, and chemical reaction kinetics. A model must also capture the multi-scale nature of these problems. Computational fluid dynamics-discrete element method (CFD-DEM) provides an accurate description of chemical reactions and heat and mass transfer at the particle scale. Currently, MFIX-DEM, the existing CFD-DEM used as the foundation for this work, can only model coupled hydrodynamics. This dissertation extends the functionality of MFIX-DEM by addressing the remaining deficiencies in three separate efforts.;The first effort outlined in this dissertation focuses on the algorithmic development of discrete mass inflow and …
Gender Recognition And Appearance Description In Unconstrained Images Of Human Body, Qin Wu
Gender Recognition And Appearance Description In Unconstrained Images Of Human Body, Qin Wu
Graduate Theses, Dissertations, and Problem Reports (ETD)
Gender recognition has many useful applications, ranging from business intelligence, through to image search and social activity analysis. Traditional research on gender recognition focuses on face images in a constrained environment. In this work, we propose a novel problem of gender recognition in articulated human body images acquired from an unconstrained environment in the real world. Our empirical study answers the question of whether gender recognition can be performed in articulated body images, and discovers important issues such as which body parts are informative, how many body parts are needed to combine together, and what representations are good for articulated …
B-Splines In Emd And Graph Theory In Pattern Recognition, Qin Wu
B-Splines In Emd And Graph Theory In Pattern Recognition, Qin Wu
Graduate Theses, Dissertations, and Problem Reports (ETD)
With the development of science and technology, a large amount of data is waiting for further scientific exploration. We can always build up some good mathematical models based on the given data to analyze and solve the real life problems. In this work, we propose three types of mathematical models for different applications.;In chapter 1, we use Bspline based EMD to analysis nonlinear and no-stationary signal data. A new idea about the boundary extension is introduced and applied to the Empirical Mode Decomposition(EMD) algorithm. Instead of the traditional mirror extension on the boundary, we propose a ratio extension on the …
A Two Dimensional Numerical Soot Model For Advanced Design And Control Of Diesel Particulate Filters, Prabash E. Abeyratne
A Two Dimensional Numerical Soot Model For Advanced Design And Control Of Diesel Particulate Filters, Prabash E. Abeyratne
Graduate Theses, Dissertations, and Problem Reports (ETD)
One of the most effective methods to control diesel particulate matter (PM) emissions from heavy duty diesel engines is to use wall flow diesel particulate filters (DPF). It is still a major challenge to get an accurate estimation of soot loading, which is crucial for the engine afterteratment assembly optimization. In the recent past, several advanced computational models of DPF filtration and regeneration have been presented to assess the cost effective optimization of future particulate trap systems. They are characterized by different degree of detail and computational costs, depending on the specific application (i.e diagnostics, control, system design, component design …
Interpretation Of Well Test Data From Two Hydraulically Communicating Reservoirs, Bander Ibrahim Al Quaimi
Interpretation Of Well Test Data From Two Hydraulically Communicating Reservoirs, Bander Ibrahim Al Quaimi
Graduate Theses, Dissertations, and Problem Reports (ETD)
Naturally fractured reservoirs (NFR) have been receiving more attention than ever since the beginning of the last decade due to various reasons. The current understanding is not sufficient to achieve a favorable recovery factor due to the complexity associated with the fracture characterization and the dynamic behavior of the fractured system. The majority of the fractured reservoirs are developed. Therefore, before proceeding into secondary or possibly tertiary recovery processes a thorough understanding must be reached to avoid undesirable results. The huge reserve volume present in fractured oil and gas reservoirs motivate engineers, researchers, and geoscientists to exert additional efforts to …
Immune System Based Control And Intelligent Agent Design For Power System Applications, Rabie Belkacemi
Immune System Based Control And Intelligent Agent Design For Power System Applications, Rabie Belkacemi
Graduate Theses, Dissertations, and Problem Reports (ETD)
The National Academy of Engineering has selected the US Electric Power Grid as the supreme engineering achievement of the 20th century. Yet, this same grid is struggling to keep up with the increasing demand for electricity, its quality and cost. A growing recognition of the need to modernize the grid to meet future challenges has found articulation in the vision of a Smart Grid in using new control strategies that are intelligent, distributed, and adaptive. The objective of this work is to develop smart control systems inspired from the biological Human Immune System to better manage the power grid at …
Engaging The Virtual Landscape: Toward An Experiential Approach To Exploring Place Through A Spatial Experience Engine, Susan J. Bergeron
Engaging The Virtual Landscape: Toward An Experiential Approach To Exploring Place Through A Spatial Experience Engine, Susan J. Bergeron
Graduate Theses, Dissertations, and Problem Reports (ETD)
The utilization of Geographic Information Systems (GIS) and other geospatial technologies in historical inquiry and the humanities has led to a number of projects that are exploring digital representations of past landscapes and places as platforms for synthesizing and representing historical and geographic information. Recent advancements in geovisualization, immersive environments, and virtual reality offer the opportunity to generate digital representations of cultural and physical landscapes, and embed those virtual landscapes with information and knowledge from multiple GIS sources. The development of these technologies and their application to historical research has opened up new opportunities to synthesize historical records from disparate …
Intelligent Reservoir Modeling Of Lower Huron Shale, Ognjen Grujic
Intelligent Reservoir Modeling Of Lower Huron Shale, Ognjen Grujic
Graduate Theses, Dissertations, and Problem Reports (ETD)
The work presented in this thesis is an intelligent reservoir modeling and analysis of Lower Huron Shale in eastern Kentucky. Methodology used for this analysis is a recently developed Top Down Intelligent Reservoir Modeling, that couples artificial intelligence and data mining techniques with conventional reservoir engineering methods. A total of 77 wells completed in Lower Huron Shale in eastern Kentucky were used in this study. Well production data was obtained from the company operating the wells, while completion reports and well logs were downloaded from publicly available database at Kentucky Geological Surveys website. The downloaded well logs were digitized, and …
Security-Based Risk Assessment For Software Architecture, Fadi Haj Said
Security-Based Risk Assessment For Software Architecture, Fadi Haj Said
Graduate Theses, Dissertations, and Problem Reports (ETD)
Enterprise, medium and small companies develop and maintain different types of large-scale software systems for public and financial institutes. A security failure in such systems could lead to a significant impact. It is therefore essential to analyze security risk in the system components early on during the development process in order to prevent the occurrence of security failures.;The objective of this research is to develop a methodology for security risk assessment during the early software development phases to identify high security risk elements, thus enabling us to enhance security features in the early phases of software lifecycle. This methodology can …
Heavy-Duty Vehicles Modeling And Factors Impacting Fuel Consumption., Lijuan Wang
Heavy-Duty Vehicles Modeling And Factors Impacting Fuel Consumption., Lijuan Wang
Graduate Theses, Dissertations, and Problem Reports (ETD)
A conventional heavy-duty truck PSAT model was validated and incorporated into the Powertrain System Analysis Toolkit (PSAT). The truck that was modeled was a conventional over-the-road 1996 Peterbilt tractor, equipped with a 550 hp Caterpillar 3406E non exhaust gas circulation (EGR) engine and an 18-speed Roadranger manual transmission. A vehicle model was developed, along with the model validation processes. In the engine model, an oxides of nitrogen (NOx) emissions model and a fuel rate map for the Caterpillar 3406E engine were created based on test data. In the gearbox model, a shifting strategy was specified and transmission efficiency lookup tables …
Deconstructing Disparity: Examining Risk Factors Related To Smoking Among Sexual Minority Populations., John Rudolph Blosnich
Deconstructing Disparity: Examining Risk Factors Related To Smoking Among Sexual Minority Populations., John Rudolph Blosnich
Graduate Theses, Dissertations, and Problem Reports (ETD)
Despite a robust, concordant literature demonstrating that lesbian, gay, and bisexual (i.e., sexual minority) populations smoke more than their heterosexual peers, the factors contributing to this disparity are not well understood. Consequently, the main goal of this project and its three component studies was to enhance current understanding of risk factors that contribute to smoking disparities among sexual minority persons. Study 1 details a systematic review of the literature, synthesizing empirical investigations that tested associations of risk factors and correlates of smoking among sexual minority samples. Of the twenty-six studies included in the analysis, most used sexual identity to operationalize …
The Effect Of Examiner Variation In Cartridge Case Acquisition On Ibis® Correlation Scores And The Ability Of The System To Return A True Positive, Kristine M. Scicchitano
The Effect Of Examiner Variation In Cartridge Case Acquisition On Ibis® Correlation Scores And The Ability Of The System To Return A True Positive, Kristine M. Scicchitano
Graduate Theses, Dissertations, and Problem Reports (ETD)
When entering cartridge case exhibits into the Integrated Ballistics Identification System (IBIS®), examiners have the ability to manually manipulate three parameters: lighting intensity, ring selection and exhibit orientation. User guidelines for these settings are subjective, and the effect of examiner variation is largely unknown. If examiner variation negatively affects the returned correlation scores, the ability of the system to return true positives will be compromised. By entering cartridge cases into IBIS® 88 separate times, using 88 different combinations of parameter settings, the effect of these variables was determined. Analysis of variance testing revealed that no variable has a statistically significant …
Pot Heat Balance Analysis In Continuous Galvanizing Lines, Quang Minh Phuong
Pot Heat Balance Analysis In Continuous Galvanizing Lines, Quang Minh Phuong
Graduate Theses, Dissertations, and Problem Reports (ETD)
Galvanizing is an energy intensive industry. Knowing how much energy is consumed when producing a certain product will help the company in determining which products can be produced to maximize profits. E-GEPDSS was built to explore the potential of saving energy in galvanizing lines by utilizing heat balance analysis. Heat transfer mechanisms of the heat losses for the pot presented in the heat balance are basic heat transfer concepts (i.e. radiation, convection, conduction, and specific heat.;The pot heat balance model was built and applied using the data collected from a host company during the plant visit. Sensitivity analyses were done …
A Comprehensive Simulation Model For Floating Gate Transistors, Steven Joseph Rapp
A Comprehensive Simulation Model For Floating Gate Transistors, Steven Joseph Rapp
Graduate Theses, Dissertations, and Problem Reports (ETD)
Floating-gate transistors have proven to be extremely useful devices in the development of analog systems; however, the inability to properly simulate these devices has held back their adoption. The objective of this work was to develop a complete simulation model for a floating-gate (FG) MOSFET using both standard SPICE primitives and also MOSFET models taken directly from foundry characterizations. This new simulation model will give analog designers the ability simulate all aspects of floating-gate device operation including transient, AC and DC characteristics. This work describes the development of this model and demonstrates its use in various applications.
Three Essays On Caps Market And Unspanned Volatility, Harumi Hattori
Three Essays On Caps Market And Unspanned Volatility, Harumi Hattori
Graduate Theses, Dissertations, and Problem Reports (ETD)
In this thesis we study the caps market. Caps are a contract where the interest rates are capped at some fixed value r¯. Caps consist of caplets which are European options on the forward rates called LIBOR (the London Inter-Bank Offer Rates). Caps are the derivatives of LIBOR. However, their relation is not so simple as the relation between a stock and its derivatives. One important difference is that the volatility in one market does not affect the volatility of the other market as much as in the stock and its derivative markets. This phenomenon is termed unspanned stochastic volatility …
Understanding Plasmas Through Ion Velocity Distribution Function Measurements, Saikat Chakraborty Thakur
Understanding Plasmas Through Ion Velocity Distribution Function Measurements, Saikat Chakraborty Thakur
Graduate Theses, Dissertations, and Problem Reports (ETD)
This work concerns measurements of ion velocity distribution functions (IVDF) using three different diagnostic techniques in expanding argon plasmas generated by two different helicon plasma sources. A theoretical prediction by Lieberman et al., of enhanced upstream ionization by electrons accelerating upstream, due to the formation of a stable electrostatic current-free double layer (DL) in an expanding plasma, was verified through laser induced fluorescence (LIF) and retarding field energy analyzer (RFEA) measurements of the IVDF and Langmuir probe measurements of the plasma density. Keeping all other external source parameters constant and varying only the operating frequency of the helicon source HELIX, …
Spectral Approaches To Natural Mesh Processing, Takamitsu Kawai
Spectral Approaches To Natural Mesh Processing, Takamitsu Kawai
Graduate Theses, Dissertations, and Problem Reports (ETD)
Mesh design is a major bottleneck in the creation of computer games and animation. Therefore simplifying the process of mesh editing is an important problem. Natural mesh processing is generally difficult to perform since natural meshes often have nontrivial surface shapes and high degrees of freedom. In this study I present novel approaches to natural mesh processing utilizing spectral methods based on the manifold harmonic basis.;Geometric scaling transformations do not respect the biological processes which govern the size and shape of living creatures. I describe an approach to scaling which can be related to biological function. Known biological laws of …
High Rank Tensor And Spherical Harmonic Models For Diffusion Mri Processing, Inas A. Yassine
High Rank Tensor And Spherical Harmonic Models For Diffusion Mri Processing, Inas A. Yassine
Graduate Theses, Dissertations, and Problem Reports (ETD)
Diffusion tensor imaging (DTI) is a non-invasive quantitative method of characterizing tissue micro-structure. Diffusion imaging attempts to characterize the manner by which the water molecules within a particular location move within a given amount of time. Measurement of the diffusion tensor (D) within a voxel allows a macroscopic voxel-averaged description of fiber structure, orientation and fully quantitative evaluation of the microstructural features of healthy and diseased tissue.;The rank two tensor model is incapable of resolving multiple fiber orientations within an individual voxel. This shortcoming of single tensor model stems from the fact that the tensor possesses only a single orientational …
Community College Department Chairs' Leadership Styles And Faculty Utilization Of Instructional Technology, Anastasia (Stacey) L. Boggs
Community College Department Chairs' Leadership Styles And Faculty Utilization Of Instructional Technology, Anastasia (Stacey) L. Boggs
Graduate Theses, Dissertations, and Problem Reports (ETD)
This study explores the relationship between faculty utilization of instructional technology and the leadership style of mathematics and English academic department chairpersons in associate degree-granting community colleges in the states of Maryland, Pennsylvania, and Virginia. The degree to which instructional technology was utilized in teaching courses was determined through self reporting surveys answered via mail by the selected faculty and chairs in the study. The academic department chairpersons in mathematics and English departments at the selected community colleges were rated by their faculty to determine their leadership style, using the Bolman and Deal Leadership Orientations survey. The leadership styles consisted …
Teacher And Administrator Perceptions Of Technology Use In Two West Virginia Middle Schools, Carrie E. Marcum
Teacher And Administrator Perceptions Of Technology Use In Two West Virginia Middle Schools, Carrie E. Marcum
Graduate Theses, Dissertations, and Problem Reports (ETD)
The "digital natives" that are sitting in today's classrooms live their lives surrounded by technology. "The current crop of learners differs in significant ways from previous generations because, unlike their predecessors, they have literally grown up 'digital'" (Simpson & Clem, 2008, p. 2). Teachers and administrators often struggle to keep up with the technological world that students are used to. This mixed-methods study included West Virginia teachers and administrators from two middle schools. Teachers and administrators at the two schools were given surveys that addressed the following: frequency of technology use for personal and professional use, confidence level with various …
Process Model And Control System For The Glass Fiber Drawing Process, Songke Liu
Process Model And Control System For The Glass Fiber Drawing Process, Songke Liu
Graduate Theses, Dissertations, and Problem Reports (ETD)
Drawing of glass fibers is an important industrial process used for manufacture of a variety of materials ranging from optical communications cables to fiber filter media. A variety of machines exist for performing the drawing function, but all share similar problems with control of the fiber diameters and breakage of the fibers during the extrusion process. In many cases, control systems are not configured to monitor the most critical process variables-- temperature of molten glass in the furnace, but instead use only furnace crown temperature. Upsets in disturbance variables such as ambient temperature are compensated manually by operators, usually only …
A Novel Global Pattern Recognition Algorithm, Joseph M. Stoffa
A Novel Global Pattern Recognition Algorithm, Joseph M. Stoffa
Graduate Theses, Dissertations, and Problem Reports (ETD)
The background, development, performance assessment, and analysis of a novel pattern recognition algorithm that is applicable to any set of binary images are discussed. The efficacy of the algorithm when applied to the problem of fingerprint recognition is quantified. The conclusion was that the algorithm is relatively poor as a fingerprint identification algorithm, averaging an equal error rate of approximately 19% as calculated by the rules specified in the Year 2000 Fingerprint Verification Competition. The positive attributes of the algorithm were its ultra-fast matching times, orientation independence, lack of rejection events, relative insensitivity to resolution difference, and one-way transformations. The …
Design And Development Of A Prototype Of Dual Modality Pet/Optical Breast Cancer Margin Specification Imager, Krishna Nandanavanam
Design And Development Of A Prototype Of Dual Modality Pet/Optical Breast Cancer Margin Specification Imager, Krishna Nandanavanam
Graduate Theses, Dissertations, and Problem Reports (ETD)
This thesis is an attempt to develop a prototype of a breast cancer imager to assess the margins of excised breast tissue. This device is proposed to be used to assure that the entire cancerous lesion has been removed by imaging the intensity of a radio labeled tracer and inspecting for a noncancerous margin in the volume of the tissue sample. The dual modality PET/optical breast cancer specification imager uses a pair of small PET detectors to measure the bioactivity of an excised sample of tissue. A co-registered optical image is taken to allow the surgeon to visually correlate the …
Prediction For Resolution Time Of Software Defect, Da Wang
Prediction For Resolution Time Of Software Defect, Da Wang
Graduate Theses, Dissertations, and Problem Reports (ETD)
In practical software development projects, solving test issues efficiently during Software Development Life Cycle is critical to release software products on time. Different test environments, test resources and test requirements could result in different outcomes. Therefore, getting accurate prediction of the software defects' resolution time could be beneficial to the practical projects.;In our study, data mining techniques offer great promise in prediction of software defects' resolution time. Our research is conducted based on the NASA Metrics Data Program (MDP). We first calculate the resolution time for available projects. Using unsupervised discretization methods, we split resolution time into certain interval as …
Pulsar Populations In The Galaxy And Magellanic Clouds, Joshua P. Ridley
Pulsar Populations In The Galaxy And Magellanic Clouds, Joshua P. Ridley
Graduate Theses, Dissertations, and Problem Reports (ETD)
Pulsars are great tools for studying the Universe. From energetics to radio emission, many of the properties of pulsars can be used to understand other physical phenomena occurring throughout the Universe today. This dissertation examines pulsars and their properties through the use of computer simulations, describes the basic pulsar search procedure, and presents the results of a search for millisecond pulsars (MSPs) and fast radio transients in the Small Magellanic Cloud (SMC).;Using Monte Carlo simulations, a working model of normal pulsars that accurately represents the observed population was created. These simulations allow for changes to be made to the initial …