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Articles 391 - 420 of 1237
Full-Text Articles in Engineering
Detection And Recovery From Camera Bump During Automated Inspection Of Automobiles On An Assembly Line, Shawn Mathew
Detection And Recovery From Camera Bump During Automated Inspection Of Automobiles On An Assembly Line, Shawn Mathew
All Theses
This thesis details the steps taken to detect and compensate for camera bumps while per- forming part identification using VI at the BMW manufacturing plant and on the simulation testbed. For the system presented here to work, the user is required to record a video from the camera before the camera is bumped and one after the camera has been bumped. The premise behind the method suggested here is that the transformation between the background in the pre- and post-bump video will be equal to the transformation in the foreground. A Background extraction program is used to generate a background …
Condition Assessment Of Clemson University's Parking Network And Development Of A Framework To Support Pavement Management, Yazurved Sai Vishwaksen Aravalli
Condition Assessment Of Clemson University's Parking Network And Development Of A Framework To Support Pavement Management, Yazurved Sai Vishwaksen Aravalli
All Theses
The concept of pavement management system for Clemson University parking network provides a rehabilitation programming strategy for parking and transportation services department at Clemson University. The department invests funds to keep parking lots in good condition which pays large rewards in terms of savings for both Clemson University and parking lot users. Clemson University Pavement Management System (CU-PMS) will provide quality information for better decisions to ensure the funds invested gets the best value. This project consists of developing a useful and efficient network-level PMS for Clemson University parking lot network. The study area includes all the parking lots in …
The Performance Of Quaternary Amplitude Modulation With Quaternary Spreading In The Presence Of Interfering Signals, Allison Manhard
The Performance Of Quaternary Amplitude Modulation With Quaternary Spreading In The Presence Of Interfering Signals, Allison Manhard
All Theses
Multiple-access digital communications is considered with direct-sequence spread-spectrum (DS-SS) quadrature amplitude modulation and quaternary spreading in each transmission. Each transmitted signal undergoes attenuation and a delay at a receiver in the additive white Gaussian noise channel. The receiver uses coherent demodulation with a correlation detector synchronized to the one of the K received signals so that the K - 1 other transmissions act as interference. The average probability of error at the output of the detector is determined using Monte Carlo simulation and compared with an approximation in which the interference component in each detection statistic is approximated by a …
Control Of Thermoforming Process Parameters To Manufacture Surfaces With Pin-Based Tooling, Vijay Sarthy Mysore Sreedhara
Control Of Thermoforming Process Parameters To Manufacture Surfaces With Pin-Based Tooling, Vijay Sarthy Mysore Sreedhara
All Theses
Many manufacturing processes used to mass produce parts rely on expensive and time consuming tooling. These processes include sheet metal forming, injection molding, casting, and thermoforming. The time invested in design and development of tooling can be justified for high-production volumes. However, for low-volume production and customized products, the tooling investment cannot be amortized. Flexible tooling has been developed to address the needs of smaller production volumes. Reconfigurable pin tooling is an example of flexible tooling that relies on a matrix of adjustable-height pins to produce approximate surfaces. A key challenge in pin-based tooling is achieving accurate high quality surfaces …
Detecting Occlusions Of Automobile Parts Being Inspected By A Camera System During Manufacturing Assembly, Jayadevan Puthumanappilly
Detecting Occlusions Of Automobile Parts Being Inspected By A Camera System During Manufacturing Assembly, Jayadevan Puthumanappilly
All Theses
This thesis considers the problem of detecting occlusions in automobile parts on a moving assembly line in an automotive manufacturing plant. This work builds on the existing ``Visual Inspector'' (VI) system developed as a joint research project between Clemson University and the BMW Spartanburg manufacturing plant. The goal is to develop a method that can successfully detect occlusions in real-time. VI is a detector and classifier system that uses video cameras to determine the correct installation of a part in the assembly line. In the current version of VI, an occluded part is flagged simply as `not OK' - as …
Structural Optimization Using Parametric Programming Method, Krupakaran Ravichandraan
Structural Optimization Using Parametric Programming Method, Krupakaran Ravichandraan
All Theses
The Parametric Programming method is investigated to consider its applicability to structural optimization problems. It is used to solve optimization problems that have design variables as implicit functions of some independent input parameter(s). It provides optimal solutions as a parametric function of the input parameter(s) for the entire parameter space of interest. It does not require the detailed discrete optimizations needed at a large number of parameter values as in traditional non-parametric optimization. Parametric programming is widely used in optimal controls, model predictive control, scheduling, process synthesis and material design under uncertainty due to the above mentioned benefits. Its benefits …
Single Particle And Biological Cell Detection By A Radio Frequency Interferometer, Zheng Wang
Single Particle And Biological Cell Detection By A Radio Frequency Interferometer, Zheng Wang
All Theses
This thesis presents a series of studies on single particle and biological cell detection and differentiation by a radio frequency (RF) interferometer system. Several techniques, such as dielectrophoresis (DEP), time domain method and 3D focusing have been illustrated and investigated to demonstrate the capacity of interrogating the electric property of single particle or biological cell by the RF interferometer. Silica particles and live yeast cells are trapped at the sensing area by DEP force and detected by the RF sensor. Solutions of particle mixtures (~4 μm silica and ~10 μm polystyrene) and cell mixtures (viable and non-viable yeast cells, normal …
Design Of A Web Application To Improve The Efficiency Of Crnas., Venkatramanan Chanchapalli Madhavan
Design Of A Web Application To Improve The Efficiency Of Crnas., Venkatramanan Chanchapalli Madhavan
All Theses
Physical artifacts such as whiteboards have been successfully used in healthcare facilities to keep track of dynamic changes in information and to manage work schedules. Since these whiteboards are easy- to- use and do not require any technical expertise, they have been easy- to-adopt. Additionally, they act as memory aids for the users by capturing transient information. However, they have their own limitations, the primary ones being the lack of mobility and real-time updates, both of which are crucial in a high consequence environment such as a healthcare facility. These whiteboards are usually kept in a central location with the …
A Compact Driving Simulator To Support Research And Training Needs - Hardware, Software, And Assessment, Qimin Yao
All Theses
In 2009, there were 10.8 million automotive crashes in the United States. When reviewing these incidents, young drivers were the over-represented group who were involved in these vehicular crashes. One reason that these young drivers have such high crash rates is that they often do not possess extensive driving knowledge and typically lack driving experience. Over the past three decades, researchers have investigated the driver training process which includes the classroom and behind the wheel to help address teaching the deficiencies in the driver education program. To complement the current driver education process, automotive simulators can be utilized to teach …
The Effect Of High-Pressure Devitrification And Densification On Ballistic-Penetration Resistance Of Fused Silica, Vasudeva Avuthu
The Effect Of High-Pressure Devitrification And Densification On Ballistic-Penetration Resistance Of Fused Silica, Vasudeva Avuthu
All Theses
Despite the clear benefits offered by more advanced transparent materials, (e.g. transparent ceramics offer a very attractive combination of high stiffness and high hardness levels, highly-ductile transparent polymers provide superior fragment-containing capabilities, etc.), ballistic ceramic-glass like fused-silica remains an important constituent material in a majority of transparent impact-resistant structures (e.g. windshields and windows of military vehicles, portholes in ships, ground vehicles and spacecraft) used today. Among the main reasons for the wide-scale use of glass, the following three are most frequently cited: (i) glass-structure fabrication technologies enable the production of curved, large surface-area, transparent structures with thickness approaching several inches; …
The Partially Rechargeable Electric Vehicle Routing Problem With Time Windows And Capacitated Charging Stations, Navid Matin Moghaddam
The Partially Rechargeable Electric Vehicle Routing Problem With Time Windows And Capacitated Charging Stations, Navid Matin Moghaddam
All Theses
Electric vehicles are potentially beneficial for both the environment and an organization's bottom line. These benefits include, but are not limited to, reduced fuel costs, government tax incentives, reduced greenhouse gas emissions, and the ability to promote a company's "green" image. In order to decide whether or not to convert or purchase electric trucks and install charging facilities, decision makers need to consider many factors including onboard battery capacity, delivery or service assignments, scheduling and routes, as well as weather and traffic conditions in a well-defined modeling framework. We develop a model to solve the partially rechargeable electric vehicle routing …
The Effect Of Procedural Changes On The Rate Of Clinical Alarms In The Intensive Care Unit, Puneeth Kalavagunta
The Effect Of Procedural Changes On The Rate Of Clinical Alarms In The Intensive Care Unit, Puneeth Kalavagunta
All Theses
Clinical alarms have become an indispensable part of medical environment, but issues related to alarm artifacts, false alarms, and alarm fatigue have been identified. A national online survey administered to hospitals stated healthcare workers determined that 81% of respondents agreed that alarms occur frequently, 77% agreed that excessive clinical alarms disrupt patient care, and 78% agreed that reduced trust in alarms cause caregivers to disable them (Korniewicz, Clark, & David, 2008). Studies have suggested that preparation of skin of the patient improves electrode-skin contact, thereby resulting in fewer artifacts (Hermens, Freriks, Disselhorst-Klug, & Rau, 2000). Additionally, clinical studies have shown …
Feasibility Analysis Of Steam Ventilation In Supercavitation Design, Austin Culberson
Feasibility Analysis Of Steam Ventilation In Supercavitation Design, Austin Culberson
All Theses
The complete envelopment of a submerged object by a continuous cavity, or supercavity, results in significant reduction of the skin drag acting on the object, allowing for substantial increases in the maximum speeds of underwater devices. The formation of supercavities often requires supplemental ventilation, traditionally by non-condensable gasses, as natural supercavitation occurs at relative speeds between the object and liquid medium that are infeasible for the device to reach without supercavitation itself. The aim of this research is to investigate the feasibility of vaporous ventilation in supercavitation design with the hope of reducing non-condensable ventilation requirements which are inherently limited …
Finite Element Analysis Of Effective Mechanical Properties Of Hierarchical Honeycomb Structures, Ninad Gandhi
Finite Element Analysis Of Effective Mechanical Properties Of Hierarchical Honeycomb Structures, Ninad Gandhi
All Theses
Honeycomb structures are widely used in engineering applications mainly due to their high strength to weight ratio. By changing the base material and geometry of the repeating unit cell structure, target effective properties can be achieved. Hierarchical honeycomb structures are known to have enhanced mechanical properties when compared to regular honeycomb structures. Therefore, it is important to understand and quantify the mechanical properties and the variation of these properties with the presence of hierarchy. This investigation builds upon prior work and considers the mechanical properties of two dimensional hierarchical honeycomb structures. Previous research of hierarchical honeycomb structures studied replacing the …
Acoustic Performance Of Reiterated Hierarchical Honeycomb Structures, Naveen Nainar
Acoustic Performance Of Reiterated Hierarchical Honeycomb Structures, Naveen Nainar
All Theses
Sandwich panels constructed from honeycomb structures have been found to reduce sound transmission and improve vibration isolation. In this work, reiterated hierarchical honeycomb structures have been modeled for the core in sandwich panels and studied for sound transmission properties using finite element analysis. Several honeycomb unit cell geometries are considered, including, regular hexagonal, auxetic with properties of negative Poisson’s ratio, and different reiterated hierarchical structures. Previous studies have shown that auxetic honeycomb structures exhibit improved sound transmission loss compared to regular honeycomb sandwich panels. Two different orientations of the honeycomb unit cell geometry have been studied, namely, the zigzag and …
Acoustic Scattering Response Of Hierarchic Honeycomb Structures For Cylindrical And Spherical Structures, Arun Mor
All Theses
Sandwich panels with honeycomb core are often employed in structures for improved mechanical properties with lightweight. Honeycombs are defined by non-overlapping and periodic unit cells. Most research conducted on these sandwich panels focuses on stiffness and strength properties. The acoustic aspect of these panels has been focused on sound transmission loss. For acoustics, previous studies used effective honeycomb orthotropic elastic moduli based on Cartesian unit cell geometry to model the core as a homogeneous structure. While efficient, this modeling approach loses accuracy at higher frequencies. Furthermore, when used for curved panels, the effective moduli are only approximate. In this work, …
Exploring The Use Of Bamboo Reinforced Rubberized Concrete (Brrc) As A Sustainable Standard System, Muxing Ding
Exploring The Use Of Bamboo Reinforced Rubberized Concrete (Brrc) As A Sustainable Standard System, Muxing Ding
All Theses
Concrete is the predominant material used in construction, in particular, for commercial structures. It has many advantages including low cost, high availability, low maintenance, high compressive strength and high durability. However concrete is a brittle material with very low tensile strength. Hence, steel, in the form of rebar is typically used to reinforce concrete. The cost of steel rebar is relatively high, especially in many developing countries compared to their average income. Therefore, minimal rebar is used to reinforce concrete homes and other low-rise buildings in developing countries such as Haiti leading to unsafe structures, especially during earthquakes. The high …
Inertial Particle Dynamics In Simple Vortex Flow Configurations, Senbagaraman Sudarsanam
Inertial Particle Dynamics In Simple Vortex Flow Configurations, Senbagaraman Sudarsanam
All Theses
Dynamics of inertial particles differ significantly from that of the underlying fluid flow. This difference in the dynamics of Inertial particles from that of fluid tracers can be exploited to segregate particles by size. While external forces can be used to manipulate the dynamics of such particles, using hydrodynamic forces which are always present in the flows of interest to manipulate inertial particle dynamics offers several advantages. Vorticity is one such phenomenon that is frequently encountered in natural and industrial flows. Thus, the dynamics of inertial particles have been studied in the presence of simple vortex flow configurations in this …
Functional Thinking: A Protocol Study, Ashwinraj Thiagarajan
Functional Thinking: A Protocol Study, Ashwinraj Thiagarajan
All Theses
This thesis reports a protocol study that examines how designers construct function structure graphs as they understand and develop solutions for novel design problems. Eight voluntary design engineers, with two to four years of experience in product design and function modeling are presented with a novel design problem for which they have to develop functional models as part of concept development. The modeling actions are video recorded and the data is analyzed using a predefined protocol that encodes the addition, deletion, and modification of model elements such as functions, flows, and text, and also other activities such as reading the …
Influence Of Low Shear And Cyclic Strain On Hyperglycemic Rat Aortic Smooth Muscle Cells: An In Vitro Dynamic Disease Model, Varun Chawla
Influence Of Low Shear And Cyclic Strain On Hyperglycemic Rat Aortic Smooth Muscle Cells: An In Vitro Dynamic Disease Model, Varun Chawla
All Theses
Vascular complications are the leading cause of morbidity and mortality amongst diabetic patients which represent a major proportion of patients undergoing coronary artery revascularization. Major advances in drug eluting stent technologies have reduced the overall rates of restenosis in general however diabetic patients still remain at a high risk thus requiring target lesion revascularization more commonly as compared to non-diabetic cohort. Phenotypic modulation demonstrated by smooth muscle cells is essential for normal wound healing response however is also contributive to initiation and development of various vascular complications including neointimal hyperplasia which ultimately leads to the lumen re-narrowing or restenosis. Hyperglycemia …
Analysis And An Application Of Rf Interferometer, Yongzhi Shao
Analysis And An Application Of Rf Interferometer, Yongzhi Shao
All Theses
The thesis investigates additive RF interferometer sensing technique, which is highly sensitive compared to other RF sensing methods. First, mathematical descriptions are given to illustrate how the RF interferometer works. Then an analysis of single particle passing over a coplanar waveguide in carrier liquid is presented, which poses as a difficulty to simulation software. The analysis is combined with interferometer mathematical equations and validated by a particle measurement in an interferometer. The interferometer sensitivity is enhanced by incorporating filters as sensing devices and functionally expanded by using the reflection coefficients. In the end, an application of gas measurement with the …
Quantum-Mechanical Calculations Of Actinyl And Europium Sorption To Graphene Oxide, Edward Helvenston
Quantum-Mechanical Calculations Of Actinyl And Europium Sorption To Graphene Oxide, Edward Helvenston
All Theses
Quantum-mechanical calculations were performed to model the interactions of U(VI), Np(V), Pu(VI), and Eu(III) with carboxyl and hydroxyl functional groups of graphene oxide (GO). Models were created for sorption to a single sheet of GO. For U(VI) and Eu(III), models were also created for sorption to two sheets to evaluate the possibility of cation-induced GO aggregation via cation cross-linking of GO sheets. The quantum-mechanical calculations were used to characterize the sorption reactions in terms of energetics and vibrational peak shifts. The calculations performed used Gaussian09 with the B3LYP hybrid functional. Sorption was seen as favorable for all cations considered; the …
Self-Adapting Parallel Framework For Long-Term Object Tracking, Salim Mohammed Ali
Self-Adapting Parallel Framework For Long-Term Object Tracking, Salim Mohammed Ali
All Theses
Object tracking is a crucial field in computer vision that has many uses in human-computer interaction, security and surveillance, video communication and compression, augmented reality, traffic control, etc. Many implementations are introduced in practice, and yet recent methods emphasize on tracking objects adaptively by learning the object’s perspectives and rediscovering it when it becomes untraceable, so that object’s absence problem (in case of occlusion, cluttering or blurring) is resolved. Most of these algorithms have high computational burden on the computational units and need powerful CPUs to attain real-time tracking and high bitrate video processing. These computational units may handle no …
Development And Validation Of An Optically-Based Strain Measuring Orthopaedic Screw For Fracture Fixation Implants, Nakul Ravikumar
Development And Validation Of An Optically-Based Strain Measuring Orthopaedic Screw For Fracture Fixation Implants, Nakul Ravikumar
All Theses
In the USA over 28 million musculoskeletal injuries are treated annually, including 2 million fracture fixation surgeries (about 0.5% of the population).[1] Treatment of large osseous defects use allografts which have failure rates of up to 25%, and complication rates as high as 30-60%.[2] Fracture fixation usually involves mechanical fixation with rods, plates and/or screws which repair slowly and are susceptible to infection. Implant infection and loosening are serious concerns, but can currently only be measured through expensive instrumented implants, biopsy culture, or radiographs. However, none of these directly quantify implant loading and stability. There is therefore a need for …
Understanding Molecular Interactions Between Proteins And Carbon Nanomaterials, Siva Dasetty
Understanding Molecular Interactions Between Proteins And Carbon Nanomaterials, Siva Dasetty
All Theses
Over the past few years there has been a rise in the number of nanomaterials engineered for a wide array of applications because of their unique properties. This rise in the development of engineered nanomaterials (ENMs) and its growing usage has also raised questions about its potential impact on the biological environment. Recent experimental studies suggest that these ENMs could be toxic due to the formation of a protein corona. Therefore, understanding the formation of a protein corona would provide some insights into the toxic behavior of ENMs. This requires understanding the interactions between proteins and ENMs. We employ molecular …
Sensitivity And Precision Analysis Of The Graph Complexity Connectivity Method, Sudarshan Sridhar
Sensitivity And Precision Analysis Of The Graph Complexity Connectivity Method, Sudarshan Sridhar
All Theses
In the Graph Complexity Connectivity Method (GCCM), twenty nine complexity metrics applied against engineering design graphs are used to create surrogate prediction models of engineering design representations (assembly models and function structures) for given product performance values (assembly time and market value). The performance of these prediction models has been previously assessed solely based on accuracy. In this thesis, the predictive precision of the surrogate models is evaluated in order to assess the GCCM's ability to generate consistent results under the same conditions. The Assembly Model - Assembly Time (AM-AT) prediction model performed the best in terms of both accuracy …
Inertial Focusing Of Particles In Curved Microchannels, Ketaki Joshi
Inertial Focusing Of Particles In Curved Microchannels, Ketaki Joshi
All Theses
Since the beginning of microfluidics, the ability to control motion of particles in microchannels has always been fascinating. Microfluidic techniques such as dielectrophoresis, magnetophoresis rely on externally applied fields to separate particles while others like hydrophoresis and deterministic lateral displacement depend on low Reynolds number operation for particle manipulation. One of these techniques is inertial focusing of particles in microchannels. The particles and channel interact to cause lateral migration of particles to equilibrium positions within channel cross-section in flow regime where inertia and viscosity of fluid are finite. Inertial focusing has wide range of applications in fields of chemical synthesis, …
Primary Flexion Axis Selection In Total Knee Replacements Using Computational Analysis, Nicholas Marais
Primary Flexion Axis Selection In Total Knee Replacements Using Computational Analysis, Nicholas Marais
All Theses
Total knee replacements (TKR) are one of the most frequently implanted medical devices, with over 600,000 procedures performed in the United States in 2012. In order to ensure TKR longevity, wear tests are frequently conducted on these implants prior to patient implantation. Variations in implant geometry, material, and surface treatments are all tested, however, TKR alignment may also play a role in the long-term success of the knee implant. When testing knee designs with complex tibial and femoral geometries it is essential that the implant be aligned as the implant manufacturers intended so as to best represent the function of …
Microcosm Evaluation Of Enhanced Bioremediation For Halogenated Methanes At A Former Industrial Site, Hao Wang
Microcosm Evaluation Of Enhanced Bioremediation For Halogenated Methanes At A Former Industrial Site, Hao Wang
All Theses
Halogenated methanes are among the most frequently encountered contaminants at hazardous waste sites. One such site in California is contaminated with chloroform (CF), carbon tetrachloride (CT), and trichlorofluoromethane (CFC-11). CF, CT and CFC-11 are the main focus of this research; they are present at the California site at concentrations in the mg per liter range and a plume of contaminated groundwater emanating from a source zone is approaching a property boundary, necessitating remediation. Anaerobic bioremediation is one of the technologies under consideration for addressing the source zone and the less concentrated downgradient plume. A microcosm study was performed to evaluate …
Exploring The Potential Impact Of Meditation Intervention On Stroke Trends In The United States., Raj Ambavane
Exploring The Potential Impact Of Meditation Intervention On Stroke Trends In The United States., Raj Ambavane
All Theses
Meditation has shown promise in clinical trials in reducing systolic blood pressure, one of the main causes of stroke. We explore the potential impact of expanding meditation intervention on stroke trends in the US. We developed a dynamic population simulation in which the progression of each individual is governed by a micro-simulation model. We calibrated the micro-simulation model for stroke incidence and further validated it by comparing the stroke-related mortality for each age group generated by the model with that observed in the US. We used the population simulation model to estimate the effects of mindfulness meditation intervention on stroke …