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Articles 151 - 178 of 178
Full-Text Articles in Engineering
Strengthening The Anonymity Of Anonymous Communication Systems, Christopher Abbott
Strengthening The Anonymity Of Anonymous Communication Systems, Christopher Abbott
All Theses
In this work, we examine why a popular anonymity network, Tor, is vulnerable to timing side-channel attacks. We explore removing this vulnerability from Tor without sacrificing its low-latency which is important for usability.
We find that Tor is vulnerable because inter-packet delays propagate along the network path from the source to the destination. This provides an easily detected signature. We explore techniques for making the timing signature either expensive or impossible to detect.
If each packet took a unique, disjoint path from source to destination the inter-packet delay signature would be undetectable. Jitter and latency would change packet arrival orders. …
Finite Element Analysis Prediction Of Stresses In H.L. Hunley Submarine By Global-To-Local Model Coordination, Aditya Sai Nag Choragudi
Finite Element Analysis Prediction Of Stresses In H.L. Hunley Submarine By Global-To-Local Model Coordination, Aditya Sai Nag Choragudi
All Theses
H.L Hunley was a submarine of the Confederate States of America that participated in the American Civil War. On February 17, 1864, H.L.Hunley created history by becoming the first submarine to sink a enemy ship after its attack on USS Houstanic. After Hunley never returned to the shore and the details of its wreck were unknown. On August 8, 2000, H. L Hunley was brought to the surface after 136 years of its wreckage. The submarine is currently at the Warren Lasch Conservation Center located in Charleston.
This study focuses on the structural analysis of the H.L Hunley submarine to …
Predictive Modeling Of Wind Turbine Blades, Kendra Van Buren
Predictive Modeling Of Wind Turbine Blades, Kendra Van Buren
All Theses
Wind turbine blades are being produced at a larger scale in order to meet demands from the burgeoning U.S. wind energy industry, and are forecasted to only grow larger for off-shore applications. Modeling and Simulation (M&S) provides a cost and time efficient alternative when studying the structural behavior of blades such as for loading conditions that are too difficult to replicate in laboratory conditions, and for various severity of damage in wind turbine blades. For this reason, M&S will continue to play an indispensible role in understanding the behavior of wind turbine blades and is gradually replacing the traditional test, …
Fate And Transport Of Escherichia Coli Within Sediment Basins On Active Construction Sites, Elizabeth Tempel
Fate And Transport Of Escherichia Coli Within Sediment Basins On Active Construction Sites, Elizabeth Tempel
All Theses
The conventional method of controlling sediment-laden runoff on construction sites is the use of sediment basins. These basins slow the velocity of runoff and allow the particles to settle from the water column before discharge to surface waters offsite. This best management practice, however, may create a reservoir for pathogenic bacteria. Sediment is known to provide protection for bacteria; therefore, while these basins decrease sediment loadings to water bodies downstream, they may introduce harmful levels of pathogenic bacteria into these surface waters. In addition to causing human health risks, these high bacteria levels alter natural biological makeup of downstream ecosystems. …
Unified Point-Edgelet Feature Tracking, Kalaivani Sundararajan
Unified Point-Edgelet Feature Tracking, Kalaivani Sundararajan
All Theses
Feature tracking algorithms have conventionally tracked `corner' features or windows with high spatial frequency content. However, this conventional point feature representation of scenes would be inappropriate for poorly textured image sequences like indoor image sequences. To overcome this problem, we propose a feature tracking algorithm which tracks point features and edgelets
simultaneously. Edgelets are straight line approximations of intensity edges in an image. Hence, a combination of point features and edgelets provides a better representation of untextured sequences with the point features and edgelets complementing each other. We show that this property results in more robust tracking.
Tracking edgelets is …
A Quantitative, Technology Independent, Fidelity Metric For Evaluating Bioprinted Patterned Co-Cultures, Matthew Pepper
A Quantitative, Technology Independent, Fidelity Metric For Evaluating Bioprinted Patterned Co-Cultures, Matthew Pepper
All Theses
The study of cell-cell interactions is crucial in the understanding of cell behaviors such as tumor genesis, proliferation, migration, metastasis, and apoptosis. To break down the complex web of signals in vivo, researchers must replicate some parts of this environment with in vitro tissue test systems, composed of multiple cell types arranged close enough to communicate with their neighbors, i.e. high-resolution co-culture patterns. The field of bioprinting is specifically focused on creating co-culture patterns for the purposes of cell studies, but the sample resolutions of most bioprinting systems are still too coarse to permit cell communication. No way currently exists …
Scalable Capability-Based Authorization For High-Performance Parallel File Systems, Nicholas Mills
Scalable Capability-Based Authorization For High-Performance Parallel File Systems, Nicholas Mills
All Theses
As the size and scale of supercomputers continues to increase at an
exponential rate the number of users on a given supercomputer will
only grow larger. A larger number of users on a supercomputer places a
greater importance on the strength of information security. Nowhere is
this requirement for security more apparent than the file system, as
users expect their data to be protected from accidental or deliberate
modification.
In spite of the ever-increasing demand for more secure file system
access the majority of parallel file systems do not implement a robust
security protocol for fear it will negatively impact …
Influence Of Material Selection And Fabrication Process Repeatability On Mechanical Properties Of Glass-Polymer Matrix Composite Structures, Charles Edwards
Influence Of Material Selection And Fabrication Process Repeatability On Mechanical Properties Of Glass-Polymer Matrix Composite Structures, Charles Edwards
All Theses
This study has aimed to evaluate property uniformity from data obtained utilizing one design of a single layup composite plaque, three sources of glass fibers and a single, industry accepted resin to produce a repeatable fabrication process. This thesis has investigated the following:
1. Whether the type of glass (E-Glass, S-Glass, and R-Glass) influences the property values of individually tested samples compared between glass types.
2. Whether the type of glass influences the property uniformity throughout the set of tested samples.
3. Whether the composite plaque design and resulting performance, as defined by ASTM Standards or industry accepted parameters, is …
Agent-Based Under Hood Packing, Karthik Ravindranath
Agent-Based Under Hood Packing, Karthik Ravindranath
All Theses
Improving vehicle performance and passenger comfort has been a prime engineering concern and focus of research for many years in automotive design. Turning to high-performance components in an effort to improve vehicle performance alone is often not enough and their placement and interactions with other components should also be an integral part of the improvement process. With the advancement in hybrid electric vehicle technology, the packing of components under the hood is ever more essential and challenging. Under hood packing is a multi-objective optimization problem with many, and mostly conflicting objectives. A non-deterministic multi-objective evolutionary algorithm needs to be integrated …
Evaluation Of Biomass And Coal Briquettes For A Spreader Stoker Boiler Using An Experimental Furnace - Modeling And Test, Gavin Wiggins
Evaluation Of Biomass And Coal Briquettes For A Spreader Stoker Boiler Using An Experimental Furnace - Modeling And Test, Gavin Wiggins
All Theses
The compliance of coal-fired boilers with emissions regulations is a concern for many facilities. The introduction of biomass briquettes in industrial boilers can help to reduce greenhouse gas emissions and coal usage. In this research project, a thermodynamic chemical equilibrium model was derived and analytical simulations performed for a coal boiler system for several types of biomass fuels such as beech, hickory, maple, poplar, white oak, willow, sawdust, torrefied willow, and switchgrass. The biomass emissions were compared to coal and charcoal emissions. The chemical equilibrium analysis numerically estimated the emissions of CO, CO2, NO, NO2, N2O, SO2, and SO3. When …
Joule Heating Effects On Electrokinetic Transport In Constriction Microchannels, Sriram Sridharan
Joule Heating Effects On Electrokinetic Transport In Constriction Microchannels, Sriram Sridharan
All Theses
Microfluidic technology involving multidisciplinary studies including MEMS, chemistry, physics, fluids and heat transfer has been developed into a promising research field in the recent decade. If offers many advantages over conventional laboratory techniques like reduced reagent consumption, faster analysis, easy fabrication and low chemical waste. Microfluidic lab-on-a-chip devices have been used to manipulate cells and particles like sorting, separating, trapping, mixing and lysing. Microfluidic manipulation can be achieved through many methods and insulator based dielectrophoresis (iDEP) is one of the highly used method in the recent years. In iDEP, both DC and AC voltages can be applied to the remote …
Integrating Phase Change Materials In Building Materials: Experimentation, Characterization And Numerical Simulation, Esvar Subramanian
Integrating Phase Change Materials In Building Materials: Experimentation, Characterization And Numerical Simulation, Esvar Subramanian
All Theses
Phase Change Materials (PCM) have many commercial applications, including in buildings to reduce cooling and heating loads. However, the lack of research has prevented their use as a common building material. This research is part of a larger project that aims at developing a set of practical design guidelines for integrating PCM in buildings. A review of and classification of common PCM available on the market is provided. The thesis then focuses on the experimental characterization of the thermo-physical properties of PCM-integrated building materials and the development of a numerical model for the thermal analysis of buildings with PCM. Different …
Implementing Transparent Compression And Leveraging Solid State Disks In A High Performance Parallel File System, David Bonnie
Implementing Transparent Compression And Leveraging Solid State Disks In A High Performance Parallel File System, David Bonnie
All Theses
In recent years computers have been increasing in compute density and speed at a dramatic pace. This increase allows for massively parallel programs to run faster than ever before. Unfortunately, many such programs are being held back by the relatively slow I/O subsystems that they are forced to work with. Storage technology simply has not followed the same curve of progression in the computing world. Because the storage systems are so slow in comparison the processors are forced to idle while waiting for data; a potentially performance crippling condition.
This performance disparity is lessened by the advent of parallel file …
Multi-Scale Modeling Of The Fontan Circulation Using A Mock Circulatory System, John Chiulli
Multi-Scale Modeling Of The Fontan Circulation Using A Mock Circulatory System, John Chiulli
All Theses
The Fontan circulation is the result of a series of operations performed to save the lives of children born with univentricular circulations. The Fontan procedure achieves venous return to the pulmonary circulation without a ventricular power source. The load on the heart is reduced to normal, and these patients can lead a normal life into adulthood, although late complications continue to prevent normal lifespan. A unique feature of the Fontan circulation is the dependency of inferior vena cava flow on respiration. The Fontan circulation has been modeled experimentally using an adjustable mock circulatory system, which for the first time includes …
Vascular Smooth Muscle Cells In Response To Gold Nanoparticles, William Mcallister
Vascular Smooth Muscle Cells In Response To Gold Nanoparticles, William Mcallister
All Theses
In this master's thesis we look at elucidating the interactions between nanoparticles and cells. Specifically, we looked at how the cell mechanics are affected, cytotoxicity of the nanoparticles, and shifts in cell phenotypes. There has been much research looking into whether nanoparticles are cytotoxic, but limited amounts looking at their effect on mechanics especially with vascular smooth muscle cells. This cell type has two distinct phenotypes of synthetic and contractile that each serve different purposes physiologically.
The first experiments we did were cytotoxicity assays to see if the cells could survive the treatment with nanoparticles. If the cells died within …
Effect Of Selected Parameters On Aggregate Reactivity In Accelerated Mortar Bar Test Method: Aggregate Size & Deicers, Sujay Math
All Theses
Abstract
Alkali Silica Reaction (ASR) is a chemical reaction between reactive siliceous aggregates and the alkali hydroxides present in the pore solution of hydrated cement paste in concrete. The chemical reaction produces ASR gel that is hygroscopic in nature and is volumetrically unstable in the presence of moisture. Expansion resulting from the swelling of the gel creates tensile stresses in the concrete leading to cracking and distress.
While ASR distress has been known to occur in concrete for over last 70 years, there has been an increase in the frequency of this distress in recent years. This is primarily due …
Effects Of Microenvironment On Growth And Differentiation Of Human Dental Pulp Cells, Laura Datko
Effects Of Microenvironment On Growth And Differentiation Of Human Dental Pulp Cells, Laura Datko
All Theses
Dental pulp stem cells (DPSCs) have recently been described as a potential stem cell source for various regenerative medicine and tissue engineering applications. They appear to be multipotent, however more characterization is necessary to determine the true potential of these cells. An important aspect of using DPSCs, or any stem cell type, tissue engineering application is the microenvironment within the construct. The microenvironment could include construct mechanical properties, construct composition, and 3D dynamic conditions in vivo. This work aims to study those specific microenvironment effects on DPSCs. To determine the effects of mechanical properties of the substrate on DPSCs, they …
Pose Estimation For Robotic Disassembly Using Ransac With Line Features, Shyam Sundar Aswadha Narayanan
Pose Estimation For Robotic Disassembly Using Ransac With Line Features, Shyam Sundar Aswadha Narayanan
All Theses
In this thesis, a new technique to recognize and estimate the pose of a given 3-D object from a single real image provided known prior knowledge of its approximate structure is proposed. Metrics to evaluate the correctness of a calculated pose are presented and analyzed. The traditional and the more recent approaches used in solving this problem are explored and the various methodologies adopted are discussed.
The first step in disassembling a given assembly from its image is to recognize the attitude and translation of each of its constituent components - a fundamental problem which is being addressed in this …
Parametric Amplification In The Context Of Vibratory Energy Harvesting, Roger Bode
Parametric Amplification In The Context Of Vibratory Energy Harvesting, Roger Bode
All Theses
Using a vibratory energy harvester (VEH) to independently power a sensor has become an increasingly popular topic due to the small amount of power current sensors require to operate. This can be achieved by scavenging energy from the ambient environment where the sensor is located. Numerous linear and nonlinear energy harvesters have been proposed in order to deal with various vibratory environments, along with improving the power production and/or bandwidth of the device.
In this thesis, we propose a technique to harvest energy from excitation sources that possess two frequency components: a fundamental component with large energy content, and a …
In Vitro Validation Of Finite Element Analysis Of Blood Flow In Deformable Models, Ethan Kung, Andrea S. Les, C. Alberto Figueroa, Francisco Medina, Karina Arcaute, Ryan B. Wicker, Michael V. Mcconnell, Charles A. Taylor
In Vitro Validation Of Finite Element Analysis Of Blood Flow In Deformable Models, Ethan Kung, Andrea S. Les, C. Alberto Figueroa, Francisco Medina, Karina Arcaute, Ryan B. Wicker, Michael V. Mcconnell, Charles A. Taylor
Publications
The purpose of this article is to validate numerical simulations of flow and pressure incorporating deformable walls using in vitro flow phantoms under physiological flow and pressure conditions. We constructed two deformable flow phantoms mimicking a normal and a restricted thoracic aorta, and used a Windkessel model at the outlet boundary. We acquired flow and pressure data in the phantom while it operated under physiological conditions. Next, in silico numerical simulations were performed, and velocities, flows, and pressures in the in silico simulations were compared to those measured in the in vitro phantoms. The experimental measurements and simulated results of …
Meeting Engineering Program Objectives Through Service Learning Opportunities In Developing Countries, Jeffrey M. Plumblee, Lansford Bell, Leidy E. Klotz
Meeting Engineering Program Objectives Through Service Learning Opportunities In Developing Countries, Jeffrey M. Plumblee, Lansford Bell, Leidy E. Klotz
Publications
The civil engineering profession, in an adaptive reaction to emerging roles for civil engineers, is recognizing the need for new engineers to possess a more robust skill set than just the typical design background. This paper describes the efforts of Clemson Engineers for Developing Countries (CEDC) to fulfill the more nontraditional and often unaddressed “learning outcomes” noted by ASCE’s Civil Engineering Body of Knowledge for the 21st Century as important prerequisites for licensure. The learning outcomes are addressed through ongoing international service learning projects in Cange, Haiti. The paper focuses on the following four outcomes and their fulfillment methods: leadership, …
In Vitro Validation Of Finite-Element Model Of Aaa Hemodynamics Incorporating Realistic Outlet Boundary Conditions, Ethan Kung, Andrea S. Les, Francisco Medina, Ryan B. Wicker, Michael V. Mcconnell, Charles A. Taylor
In Vitro Validation Of Finite-Element Model Of Aaa Hemodynamics Incorporating Realistic Outlet Boundary Conditions, Ethan Kung, Andrea S. Les, Francisco Medina, Ryan B. Wicker, Michael V. Mcconnell, Charles A. Taylor
Publications
The purpose of this study is to validate numerical simulations of flow and pressure in an abdominal aortic aneurysm (AAA) using phase-contrast magnetic resonance imaging (PCMRI) and an in vitro phantom under physiological flow and pressure conditions. We constructed a two-outlet physical flow phantom based on patient imaging data of an AAA and developed a physical Windkessel model to use as outlet boundary conditions. We then acquired PCMRI data in the phantom while it operated under conditions mimicking a resting and a light exercise physiological state. Next, we performed in silico numerical simulations and compared experimentally measured velocities, flows, and …
Transit System Evaluation Process: From Planning To Realization, K Bartman, Jennifer Ogle, Mashrur Chowdhury, Anne Dunning
Transit System Evaluation Process: From Planning To Realization, K Bartman, Jennifer Ogle, Mashrur Chowdhury, Anne Dunning
Publications
Many frameworks exist to help transit agencies plan, operate, and monitor the performance of transit in rural and urban communities. No framework integrates these three critical business practices into one coherent and flexible framework useful to rural and small-sized cities. The primary objective of this research was to integrate planning, operations, and performance measurement activities into a framework designed to evaluate transit in the context of overall mobility. By combining planning, evaluation, and performance monitoring processes, a succinct framework useful to transit agencies and planners was created. In addition to city entities, colleges and universities operating or contracting transit systems …
Characterizing Liquefaction Potential Of Pleistocene Soil Deposits In The Charleston Area, South Carolina, Tahereh Heidari
Characterizing Liquefaction Potential Of Pleistocene Soil Deposits In The Charleston Area, South Carolina, Tahereh Heidari
All Dissertations
Liquefaction potential of major Pleistocene deposits in the Greater Charleston area, South Carolina is investigated in this dissertation. The data considered to characterize liquefaction potential include field performance information the 1886 Charleston earthquake and the results of many seismic cone penetration tests with pore water measurements (SCPTu). The investigation begins with the Mount Pleasant area, and then expands to the entire Greater Charleston area.
A liquefaction potential map of Mount Pleasant is created through reviewing available first-hand accounts of ground behavior during the 1886 earthquake, analyzing cone penetration test and shear wave velocity data, and correlating the results with geology. …
Exploring The Potential Of Inkjet Printing For The Fabrication Of Tissue Test Systems, Vidya Seshadri
Exploring The Potential Of Inkjet Printing For The Fabrication Of Tissue Test Systems, Vidya Seshadri
All Theses
Animal models and two-dimensional assays involved in drug testing, vaccine development and basic scientific discovery are not an accurate representation of the human body; hence there is a need to develop new bench top methodologies which are better suited to yield information about in vivo behavior. There is a paucity of reliable in vitro-derived information regarding the reasons for the cause and progression of diseases. These concerns have lead to the development of three-dimensional systems which can facilitate improved understanding of disease etiology and also can bridge the path to the clinic.
The long term goal, beyond the scope of …
Improved Line Outage Detection Using Synchrophasor Measurements, Nick Mahoney
Improved Line Outage Detection Using Synchrophasor Measurements, Nick Mahoney
All Theses
The recent advent of synchronized phasor measurements has allowed a power system to be more readily observable. In fact, when multiple buses are observed, applications that were never before possible become a reality. One such application is the detection of line outages in remote or unobserved parts of the system. Two such methods of line outage detection are examined. First, principal component analysis is used to show that highly accurate line outage detection is possible. Using concepts similar to principal component analysis, a novel line outage detection algorithm is developed. Lastly, the efficacy of the novel line outage detection algorithm …
Biodegradation Kinetics For 1,2-Dichloroethane And Ethylene Dibromide In Anaerobic Enrichment Cultures Grown On Each Compound, Rong Yu
All Theses
1,2-Dichloroethane (DCA) and ethylene dibromide (EDB) are among the top 15 chlorinated aliphatic compounds on the Agency for Toxic Substances and Disease Registry's Priority List of Hazardous Substances. Co-contamination of groundwater with EDB and 1,2-DCA resulted mainly from environmental releases of leaded gasoline; these compounds were added as lead scavengers. A microcosm study by Henderson et al. with soil and groundwater from a site contaminated with leaded gasoline demonstrated anaerobic biodegradation of EDB at a higher rate, and to a greater extent, than 1,2-DCA. Both compounds were transformed mainly by dihaloelimination to ethene. The objectives of this study were to …
Segmentation Of Floors In Corridor Images For Mobile Robot Navigation, Yinxiao Li
Segmentation Of Floors In Corridor Images For Mobile Robot Navigation, Yinxiao Li
All Theses
This thesis presents a novel method of floor segmentation from a single image for mobile robot navigation. In contrast with previous approaches that rely upon homographies, our approach does not require multiple images (either stereo or optical flow). It also does not require the camera to be calibrated, even for lens distortion. The technique combines three visual cues for evaluating the likelihood of horizontal intensity edge line segments belonging to the wall-floor boundary. The combination of these cues yields a robust system that works even in the presence of severe specular reflections, which are common in indoor environments. The nearly …