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Assembly Time Modeling Through Connective Complexity Metrics, James L. Mathieson, Bradley A. Wallace, Joshua D. Summers
Assembly Time Modeling Through Connective Complexity Metrics, James L. Mathieson, Bradley A. Wallace, Joshua D. Summers
All CEDAR Publications
This paper presents an approach for the development of surrogate models predicting the assembly time of a system based on complexity metrics of the physical system architecture when detailed geometric information is unavailable. A convention for modelling physical architecture is presented, followed by a sample of 10 analysed systems used for training and three systems used for validation. These systems are evaluated on complexity metrics developed from graph theoretic measures. An example model is developed based on a series of regressions of trends observed within the sample data. This is validated against the systems that are not used to develop …
Compressive Strength Of Continuous Fiber Unidirectional Composites, Ronald Thompson
Compressive Strength Of Continuous Fiber Unidirectional Composites, Ronald Thompson
All Dissertations
Dow and Rosen's work in 1965 formed an intellectual framework for compressive strength of unidirectional composites. Compressive strength was explained in terms of micro-buckling, in which filaments are beams on an elastic foundation. They made simplifying assumptions, with a two dimensional idealization and linearized material properties. This study builds on their model, recognizing that the shear mode of instability drives unidirectional compressive strength. As a necessary corollary, the predictive methods developed in this study emphasize correct representation of composite shear stiffness. Non-linear effects related to matrix material properties, fiber misalignment, three dimensional representation, and thermal prestrains are taken into account. …
Surface Damage In Retrieved Total Knee Replacement Femoral Components, Estefania Alvarez
Surface Damage In Retrieved Total Knee Replacement Femoral Components, Estefania Alvarez
All Dissertations
The metallic femoral components of total knee replacements are subject to in vivo surface damage and roughening that can severely limit the service lifetime of the bearing system. To date, there are no national standards by which to characterize the severity and damage modes of these critical bearing surfaces, and therefore it remains difficult to accurately assess how femoral damage influences total joint replacement bearing longevity. In vitro and in vivo studies have shown that severe surface damage of the femoral component can occur, however, there is still no defined test methodology that can identify or replicate the types of …
Mechatronic System Design - A Hydraulic-Based Engine Cooling System Design And Refinement Of A Technical Elective Mechatronics Course, Rajwardhan Patil
Mechatronic System Design - A Hydraulic-Based Engine Cooling System Design And Refinement Of A Technical Elective Mechatronics Course, Rajwardhan Patil
All Theses
The improvement of consumer products and industrial processes, in terms of functionality and reliability, has recently focused on the integration of sensors and real time controllers with attached actuators into the given physical system. The likelihood of long-term market penetration of smart devices has placed an emphasis on preparing engineering graduates for technology leadership roles in the workforce. This thesis examines mechatronic systems in two manners. First, an intelligent automotive internal combustion engine cooling system is studied for ground vehicles using hydraulic actuators which offer the opportunity for greater versatility and performance. Second, improvements to a technical elective mechatronics course …
Development Of A Lower Extremity Mobility Assessment Methodology For Motor Vehicle Operation And Initial Validation, Justin Arnosky
Development Of A Lower Extremity Mobility Assessment Methodology For Motor Vehicle Operation And Initial Validation, Justin Arnosky
All Theses
Limited quantifiable data exists on lower extremity mobility and function during driving. To date, the most appropriate existing measures of successful driving function are assessed by a driving rehabilitation specialist during an on-road evaluation. Establishing the kinematic chain- or the order and magnitude in which joints are moved- during driving may prove to be a useful tool in lower extremity function assessment in drivers. To this end, a study was conducted instrumenting both the left and right legs of healthy licensed male drivers (18-26 years old) with a system of angle measuring goniometers (Biometrics, Ltd.) in a driving simulator (DriveSafety …
Pozzolanic Properties Of Biomass Fly Ash, Robert Lowe
Pozzolanic Properties Of Biomass Fly Ash, Robert Lowe
All Theses
As biomass power production becomes more main stream, problems with waste disposal arise. Coal fly ash, a by-product of coal power production, has beneficial strength and durability properties when used as a cement replacement material. This study examined strength and durability characteristics of mortar and concrete samples containing biomass fly ash obtained from Craven County Wood Energy in North Carolina and examined methods of processing the material to enhance its pozzolanic characteristics.
The chemical and mineralogical compositions of the ash were determined using X-ray fluorescence (XRF), X-ray diffraction (XRD), and energy dispersive X-ray spectroscopy (EDS). The compositions met the requirements …
Expert System Based Approach For Material Selection Of Automobile Body-In-White Structural Panels Using Numerical Ranking And Sustainability Indices, Ahmad Mayyas
All Dissertations
The goal of this work is to establish a set of quantifiable measures for design for sustainability (DFS) that can be applied to automotive applications in terms of environmental, social, economic and technical aspects. In this study, a comprehensive analysis was made in order to develop a methodology that can evaluate different body-in-white designs in terms of major sustainability aspects. Besides the complete life cycle analysis, environmental impacts and cost factors will be analyzed over vehicle's entire life-cycle (fuel extraction and refining, Pre-manufacturing, Manufacturing, Use, and
Post-use stages). The considered material options include: conventional steel, high strength steel, aluminum, magnesium, …
Quantitative, Spatial Imaging Based Measurements To Assess Cellular Health And Oxygenation In A Tissue Engineered Test System, Erik Bland
All Dissertations
Three-dimensional in vitro tissue test systems are employed to examine cell behavior, test responses to drugs and vaccines, and answer basic biological questions. These systems are more physiologically relevant than two-dimensional cell cultures, and are more relevant, easier and less expensive to maintain than animal models. However, methods used to measure cell behavior and viability have been developed specifically for two-dimensional cell cultures or animal models, and are often not optimally translated to three-dimensional in vitro test systems. The purpose of this work was to aid in the development of three-dimensional, spatially controlled in vitro test systems, and to develop …
First Generation College Students In Engineering: A Grounded Theory Study Of Family Influence On Academic Decision Making, Denise Simmons
First Generation College Students In Engineering: A Grounded Theory Study Of Family Influence On Academic Decision Making, Denise Simmons
All Dissertations
This work develops a constructivist grounded theory describing the influence of family and those that serve a role similar to family on the academic decision making of undergraduate first generation in college (FGC) students majoring in engineering. FGC students, in this study, are students with neither parent having attained a bachelor's degree.
FGC students are an untapped talent pool with the potential to diversify and increase the number of engineers, which are both urgent national priorities. Much is known about FGC students with respect to their academic preparation, transition to postsecondary education, and progress toward degree attainment. However, the literature …
Statistical Analysis Of The Stress-Energy Methodology Applied To Cushion Curve Determination, Kendalyn Paulin
Statistical Analysis Of The Stress-Energy Methodology Applied To Cushion Curve Determination, Kendalyn Paulin
All Theses
The stress-energy method is a proposed enhancement to ASTM D1596 that reduces all drop height, thickness and static load combinations into a single equation that can be used to generate any reasonable cushion curve for a particular material. There remains a question as to how accurate the stress-energy method can predict acceleration values and whether it is statistically comparable to ASTM D1596. There are three phases to this research that attempt to determine the accuracy of the stress-energy method: gathering data using the stress-energy method and analyzing the goodness of fit of the stress-energy equation, predicting a cushion curve and …
Assessment Of A Safe Driving Program For Novice Drivers And Smart Jersey Barrier Design To Minimize Animal-To-Vehicle Collisions, Lance Clark
All Theses
Each year, the total number of vehicles, motorists, highway infrastructures, and distance traveled by drivers increases on a global basis. This rise in personal and commercial ground vehicle usage brings with it the advantages of the modern age, but it is not without societal cost. Vehicular incidents result in tens of thousands of deaths each year in the United States alone. For this reason, research has been performed to advance driver safety while simultaneously providing wildlife with means to avoid animal-to-vehicle collisions (AVC). In this thesis, two solutions are proposed: a driver education program with classroom experiences, in-vehicle resources, and …
Parameterization Of Fao Aquacrop Model For Irrigated Cotton In The Humid Southeast U.S.A, Xin Qiao
Parameterization Of Fao Aquacrop Model For Irrigated Cotton In The Humid Southeast U.S.A, Xin Qiao
All Theses
Cotton (Gossypium hirsutum L) is cultivated in many countries under both rainfed and irrigated conditions. In the U.S.A., cotton is grown in 17 states across a vast region known as the Cotton Belt. In the Cotton Belt as with many parts of the world, irrigated cotton is a considerable water user, but for good reasons. Irrigation can boost yield as well as stabilize yield and quality by ensuring adequate soil water during the entire growing season or at least during critical growth stages in areas where water resources are limited. From 2002 to 2007, irrigated acreage in the western states …
Finite Element Modeling And Design Of Honeycomb Sandwich Panels For Acoustic Performance, David Griese
Finite Element Modeling And Design Of Honeycomb Sandwich Panels For Acoustic Performance, David Griese
All Theses
Honeycomb cellular metamaterial structures offer many distinct advantages over homogenous materials because their effective material properties depend on both their constituent material properties and their geometric cell configuration. From this, a wide range of targeted effective material properties can be achieved thus supporting forward design by tailoring the honeycomb cellular materials and properties for specific applications. One area that has not been fully explored is the set of acoustic properties of honeycomb materials and how these can offer increased design flexibility when targeting acoustic performance. Understanding these relations, the designer can effectively tune designs to perform better in specific acoustic …
Connected Vehicle Supported Electric Vehicle Charging Operations And Related Infrastructure Issues, Jennifer Johnson
Connected Vehicle Supported Electric Vehicle Charging Operations And Related Infrastructure Issues, Jennifer Johnson
All Theses
Due to the tremendous political, economic and environmental pressures the transportation sector is facing, the United States finds itself devoting more energy to innovative solutions like electric vehicle (EV) technologies. The first objective of this study was to analyze how utilizing real-time information dissemination transferring capabilities to vehicles, as envisioned in the 'connected vehicle' system, could effectively facilitate the EV charging process at fast-charging stations. By simulating a traffic network of EVs in Matlab, it was found that the total time due to the battery charging process could be optimized for EVs that were able to use connected vehicle communications. …
A System-Generated Password And Mnemonic Approach To Optimize The Security And Usability Of Text-Based Passwords, Sanjaykumar Ranganayakulu
A System-Generated Password And Mnemonic Approach To Optimize The Security And Usability Of Text-Based Passwords, Sanjaykumar Ranganayakulu
All Theses
In this study a novel password generation policy called the system-generated password and mnemonic was designed and implemented. The intent of this policy was to optimize both the security and usability of text-based passwords. After implementing the policy we evaluated its usability and compared it with three other existing policies: user-generated password, system-generated password and user-generated mnemonic for a system-generated password. In order to have a fair comparison among the policies we maintained a constant level of security of 30±2 entropy as dictated by NIST level 2 standards.
The study involved 64 participants, equally divided into four groups, 16 in …
Network Service Delivery And Throughput Optimization Via Software Defined Networking, Aaron Rosen
Network Service Delivery And Throughput Optimization Via Software Defined Networking, Aaron Rosen
All Theses
In today's world, transmitting data across large bandwidth-delay product (BDP) networks requires special configuration on end users' machines in order to be done efficiently. This added level of complexity creates extra cost and is usually overlooked by users unknowledgeable to the issues. This is one example problem which can be ameliorated with the emerging software defined networking (SDN) paradigm. In an SDN, packet forwarding is controlled via software controllers. In an OpenFlow SDN, a controller can control the forwarding, rewriting, and dropping of packets based on their header attributes. The ability to handle packets in customizable ways in software has …
Piercing The Cloud And Marking The Onion: Removing The Anonymity Of The Tor Network, James Ashworth
Piercing The Cloud And Marking The Onion: Removing The Anonymity Of The Tor Network, James Ashworth
All Theses
In this work, we extend previous work done on removing anonymity from The Onion Routing network (Tor). We explore previous techniques for removing Tor's anonymity developed on a private Tor network, and attempt to reproduce these results on the global public network.
We find that the previous work done on the private network is unable to be carried over to the public network. This is mainly due to the level of jitter on the public network overwhelming our earlier method for compromising Tor's anonymity. We develop a new method for compromising Tor's anonymity by using a clustering algorithm to analyze …
Using Geographic Information Systems To Analyze Accessibility In The West Bank, Jacob Elliott
Using Geographic Information Systems To Analyze Accessibility In The West Bank, Jacob Elliott
All Theses
With the recent failure of another highly publicized peace talks, the Israeli-Palestinian conflict remains a polarizing and contentious geopolitical crisis. Following the Israeli victory in the Six Day War of 1967, the West Bank and its substantial Palestinian population have lived under Israeli occupation. In response to the First Palestinian Intifada (uprising), lasting from1987 to 1993, the Israeli military imposed varying degrees of regulations to limit Palestinian mobility within the West Bank. The mobility constraints, most notably in the form of checkpoints, roadblocks, and physical obstructions, dramatically increased in volume and scale during the Second Intifada from 2000 to 2005. …
A Person Following Algorithm For Use With A Single Forward Facing Rgb-D Camera On A Mobile Robot, Sean Ficht
A Person Following Algorithm For Use With A Single Forward Facing Rgb-D Camera On A Mobile Robot, Sean Ficht
All Theses
This thesis examines the problem of person following. A person following algorithm can be separated into two distinct parts: the detection and tracking of a target and the actual following of a target. This thesis focuses mainly on the detection and tracking of a target person. For the purposes of this thesis a simple robot control architecture is used. The robot moves to follow the target in a straight line. No path planning is considered when executing robot movement.
This thesis aims to accomplish three tasks. First, the system should be able to track and follow a target when no …
Application Of Microbial Fuel Cells In A Forested Wetland, Jianing Dai
Application Of Microbial Fuel Cells In A Forested Wetland, Jianing Dai
All Theses
ABSTRACT
Electricity can be generated from forest residues, especially the organic matter from litter fall, in freshwater forested wetland environments with a microbial fuel cell (MFC) system. Electricity generation efficiency was examined for cypress, tupelo, and pine litter extracts, using dual-chamber reactors. The maximum power density generated with cypress extracts was on the level of 320 mW/m2, higher than tupelo (230 mW/m2), and pine (210 mW/m2). The efficacy of cypress extracts was also higher than tupelo and
pine, demonstrating that organic matter from cypress litter is a preferred substrate for electricity generation with MFCs. Meanwhile, low aromaticity of the substrate …
Power Generation And Control Of Mechatronics Systems - Theory And Test, Kelly Austin
Power Generation And Control Of Mechatronics Systems - Theory And Test, Kelly Austin
All Theses
An integrated, multi-disciplined approach to engineering design is a broad definition of mechatronics. Though some mechatronics proponents differ in their definitions of the topic, an interdisciplinary approach to engineering is taken by many industries which should be reflected on campus in the approach to engineering education. In this thesis, two mechatronics systems are investigated. A laboratory experiment is developed for use in the mechanical engineering program at Clemson University, and a thermoelectric power generation from diesel engine exhaust heat is investigated as an automotive industry application.
An electromagnet excited masspendulum system with attached spring and damper elements is introduced as …
Understanding The Behavior Of A Pile Foundation In Unsaturated Soils Subjected To Lateral Loading, Brian Machmer
Understanding The Behavior Of A Pile Foundation In Unsaturated Soils Subjected To Lateral Loading, Brian Machmer
All Theses
The purpose of this research was to further understand the behavior of pile foundations in unsaturated soils subjected to lateral loading. Recent case histories show the importance of incorporating unsaturated soil mechanics in geotechnical engineering practice for the design and construction of resilient and cost effective systems. Unsaturated soils are a three phase material- solid, liquid and gas, resulting in three interfaces. Among the three interfaces the liquid-gas interface, also known as the contractile skin, plays a critical role in the mechanical and flow behaviors of unsaturated soil. The effects of the contractile skin are measured in terms of matric …
Reasons For Change Propagation: A Case Study In An Automotive Oem, Prabhu Shankar, Beshoy Morkos, Joshua D. Summers
Reasons For Change Propagation: A Case Study In An Automotive Oem, Prabhu Shankar, Beshoy Morkos, Joshua D. Summers
All CEDAR Publications
This paper focuses on identifying the reasons for change propagation during the production phase of the product life cycle. Unlike the traditional change propagation study where the focus is within the product, this study is focused to understand the propagation effects of change on other functional silos in the manufacturing firm. First, the reasons for the changes are identified using archival analysis through which it is found that 77.0 % of changes are due to internal reasons while 23.0 % are external. Second, these changes are distinguished into genesis, and propagated changes using a matrix-based modeling approach from which the …
Predicting Requirement Change Propagation Using Higher Order Design Structure Matrices: An Industry Case Study, Beshoy Morkos, Prabhu Shankar, Joshua D. Summers
Predicting Requirement Change Propagation Using Higher Order Design Structure Matrices: An Industry Case Study, Beshoy Morkos, Prabhu Shankar, Joshua D. Summers
All CEDAR Publications
This research examines higher order design structure matrices as requirements change modelling tools to predict requirement change propagation through two large-scale industry design projects. Due to the iterative nature of design, requirements will evolve and change. Changes in requirements can propagate to other requirements on different subsystems leading to possible increases in the project cost and lead-time. Predicting these requirement changes enables the designers to foresee unanticipated changes and maximises the probability for the project's success. These studies reveal that second-order relationships are influential in predicting requirement change propagation. Unforeseen propagation occurring in first-order form was rare, rather it was …
Lib 3010 Spring 2012: Students Choose An Image To Represent Patent Searching, Jan Comfort
Lib 3010 Spring 2012: Students Choose An Image To Represent Patent Searching, Jan Comfort
Jan Comfort
Students enrolled in LIB 3010 (a one hour credit-bearing class on patent searching) were asked to supply an image and write a few sentences describing how it represented their experience.
Extending Origami Technique To Fold Forming Of Sheet Metal Products, Ala Qattawi
Extending Origami Technique To Fold Forming Of Sheet Metal Products, Ala Qattawi
All Dissertations
This dissertation presents a scientific based approach for the analysis of folded sheet metal products. Such analysis initializes the examination in terms of topological exploration using set of graph modeling and traversal algorithms. The geometrical validity and optimization are followed by utilizing boundary representation and overlapping detection during a geometrical analysis stage, in this phase the optimization metrics are established to evaluate the unfolded sheet metal design in terms of its manufacturability and cost parameters, such as nesting efficiency, total welding cost, bend lines orientation, and maximum part extent, which aides in handling purposes. The proposed approach evaluates the design …
Manufacturing Process Modeling And Application To Intelligent Control, M. Laine Mears, Parakshit Mehta, Mathew Kuttolamadom, Carlos Montes, Joshua Jones, Wesley Salandro, Drew Werner
Manufacturing Process Modeling And Application To Intelligent Control, M. Laine Mears, Parakshit Mehta, Mathew Kuttolamadom, Carlos Montes, Joshua Jones, Wesley Salandro, Drew Werner
Publications
This paper reviews the major findings and intellectual contributions made over the past five years through research in the laboratory of Dr. Laine Mears at Clemson University. The focus of the laboratory’s work is in modeling of traditional and novel manufacturing processes, and application of such models to process control through model-based control strategies. Introducing intelligence to the manufacturing process through physical descriptions of the phenomena being controlled allows for more precise control as compared with reactive systems or those with simple feed-forward control schemes. For traditional processes, new approaches to process characterization allow for more precise control. For novel …
Dynamic Endothelialization Of Aortic Heart Valve Scaffolds, Richard Pascal
Dynamic Endothelialization Of Aortic Heart Valve Scaffolds, Richard Pascal
All Theses
Cardiovascular disease is the number one killer worldwide affecting both the heart and blood vessels. Valvular heart disease can arise from calcification, and structural deterioration resulting in a stenotic or regurgitant valve incapable of proper function. With approximately 275,000 valve replacements performed annually worldwide, the need for replacement heart valves is well established. Currently, treatment of valvular heart disease is limited to two options (mechanical and bioprosthetic). Both replacement valves have their own drawbacks, which have driven research in the bioengineering field to focus on the development of a tissue engineered heart valve (TEHV) capable of growth and self-repair.
A …