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Accuracy And Repeatability Of Single-Pose Calibration Of Inertial Measurement Units For Whole-Body Motion Analysis, Xavier Robert-Lachaine, Hakim Mecheri, Christian Larue, André Plamondon

Études primaires

Portable inertial measurement units (IMUs) are suitable for motion analysis outside the laboratory. However, IMUs depend on the calibration of each body segment to measure human movement. Different calibration approaches have been developed for simplicity of use or similarity to laboratory motion analysis, but they have not been extensively examined. The main objective of the study was to determine the accuracy and repeatability of two common single-pose calibrations (N-pose and T-pose) under different conditions of placement (self-placement and passive placement), as well as their similarity to laboratory analysis based on anatomical landmarks. A further aim of the study was to …

Effect Of Local Magnetic Field Disturbances On Inertial Measurement Units Accuracy, Xavier Robert-Lachaine, Hakim Mecheri, Christian Larue, André Plamondon

Études primaires

Inertial measurement units (IMUs), a practical motion analysis technology for field acquisition, have magnetometers to improve segment orientation estimation. However, sensitivity to magnetic disturbances can affect their accuracy. The objective of this study was to determine the joint angles accuracy of IMUs under different timing of magnetic disturbances of various durations and to evaluate a few correction methods. Kinematics from 12 individuals were obtained simultaneously with an Xsens system where an Optotrak cluster acting as the reference system was affixed to each IMU. A handling task was executed under normal laboratory conditions and imposed magnetic disturbances. Joint angle RMSE was …

Obesity And Obesity Shape Markedly Influence Spine Biomechanics: A Subject-Specific Risk Assessment Model, Farshid Ghezelbash, Aboulfazl Shirazi-Adl, André Plamondon, Navid Arjmand, Mohammad Parnianpour

Études primaires

Underlying mechanisms of obesity-related back pain remain unexplored. Thus, we aim to determine the effect of obesity and its shapes on the spinal loads and the associated risks of injury. Obesity shapes were initially constructed by principal component analysis based on datasets on 5852 obese individuals. Spinal loads, cycles to vertebral failure and trunk stability margin were estimated in a subject-specific trunk model taking account of personalized musculature, passive ligamentous spine, obesity shapes, segmental weights, spine kinematics and bone mineral density. Three obesity shapes (mean and extreme abdominal circumferences) at three body weights (BWs) of 86, 98 and 109 kg …

Validation Of Inertial Measurement Units With An Optoelectronic System For Whole-Body Motion Analysis, Xavier Robert-Lachaine, Hakim Mecheri, Christian Larue, André Plamondon

Études primaires

The potential of inertial measurement units (IMUs) for ergonomics applications appears promising. However, previous IMUs validation studies have been incomplete regarding aspects of joints analysed, complexity of movements and duration of trials. The objective was to determine the technological error and biomechanical model differences between IMUs and an optoelectronic system and evaluate the effect of task complexity and duration. Whole-body kinematics from 12 participants was recorded simultaneously with a full-body Xsens system where an Optotrak cluster was fixed on every IMU. Short functional movements and long manual material handling tasks were performed and joint angles were compared between the two …

Public Policy And Workers’ Rights: Wrongful Discharge Discipline Actions And Reasonable Good Faith Beliefs, Ann C. Mcginley, Nicole Buonocore Porter

Scholarly Works

In this paper, Professor Ann McGinley responds to Chapter 5 of the ALI's Restatement of the Law: Employment Law ("Restatement of Employment Law"), concerning "The Tort of Wrongful Discharge in Violation of Public Policy."' It proceeds in five parts. Following an introduction in Part I, Part II summarizes generally the provisions of Chapter 5, the Working Group's objections to the earlier version and recommendations for changes, and explains (when appropriate) where the final version deviated from the prior version. Part III argues that this chapter should have kept the prior version's protection against wrongful discipline instead of protecting only against …

An Analytic "Gap": The Perils Of Relentless Enforcement Of Payment-By-Underlying-Insurer-Only Language In Excess Insurance Policies, Jeffrey W. Stempel

Scholarly Works

Excess liability insurance, as the phrase implies, sits atop primary insurance or a lower layer of excess insurance and is required to cover only claims that are above the policy's "underlying limit" and reach the "attachment point" of the excess policy in question. Historically, the law was largely indifferent to whether the underlying limit was exhausted by full payment from the underlying insurer or by other means such as payment by the policyholder due to an underlying insurer's insolvency or because the policyholder and underlying insurer had compromised a coverage dispute for less than 100 percent coverage by the underlying …

The Case For A Uniform Cut Score, Joan W. Howarth

Scholarly Works

To our detriment, attorneys have become accustomed to state-by-state disparities in the cut score for our national, multiple choice licensing test, the Multistate Bar Exam (MBE). MBE cut scores range from 129 in Wisconsin to 145 in Delaware. The states with the most licensed attorneys, New York and California, use MBE cut scores of 133 and 144, respectively, which land on different sides of the national MBE score bell curve bulge. No one pretends that these disparities are justified because practicing law as a new lawyer is more difficult in California than in New York. The MBE cut score is …

Queer Practices, Queer Rhetoric, Queer Technologies: Studies Of Digital Performativity In Gendered Network Culture, Gerald Jackson

Theses and Dissertations

The question of gender and gender representation has been an issue for STEM fields like computer science and software engineering for decades. This dissertation argues that the impact of labor practices in such fields promotes gender disparity by masking gender, and often sexuality, behind myths of mastery and correctness. In this dissertation, I approach technical objects like computer code and protocol specifications from the BitTorrent and Bitcoin software packages, and argue that gendered forms of labor that have existed since the inception of computer programming as a profession are evident in technical documents like code. Furthermore, I argue that this …

Innovative Revenue Management Practices With Probabilistic Elements, Övünç Yılmaz

Theses and Dissertations

Sale of products with a probabilistic nature, where customers do not know which product they will receive at the time of service, has become popular over the recent years. In the revenue management literature, there has been a growing interest in understanding these modern approaches using analytical techniques. On the other hand, customer-centric revenue management has been replacing the long-standing inventory-centric approach because of the availability of rich data sets by focusing on understanding and predicting customer behavior and then optimizing price and/or quantity related decisions. In this dissertation, we take a customer-centric approach and do not only provide analytical …

Reducing Model Selection Computational Cost By Metamodeling The Evidence, Ramin Madarshahian

Theses and Dissertations

Modeling is an abstraction of reality that lets a designer or engineer perform simulations with a “real” object or structure without testing it physically. However, the result of simulations is as good as their models. Selecting the best model among many candidates is another challenge.

Complex models could translate into more accurate predictions, but they also require larger computational effort. The Bayes factor is often used to compare different models considering the data and analyst’s experience. To obtain the Bayes factor, the Bayesian model evidence is calculated; however, calculating the Bayesian model evidence of computationally expensive models is not a …

High School Science Teachers’ Perceptions Of The Effects Of One-To-One Computing Devices On Student Engagement, Herbert S. Bocchino Iii

Theses and Dissertations

The identified problem of practice for the present action research study centers on ways in which teacher-participants in a working class poor, rural, southern high school can use the iPads in daily science classroom activities to more effectively to engage these students in their classrooms and make the curriculum meaningful. Data in the form of classroom observations, semi-structured interviews, and teacher in-service seminars was collected over a six week period. The results of the present action research study indicate a need for more professional development for incorporating iPads into science coursework for these teacher-participants at RHS despite their claim that …

Synthesis, Characterization And Application Of Polymer-Grafted Nanoparticles, Yang Zheng

Theses and Dissertations

This work focused on the synthesis and characterization of polymer-grafted nanoparticles for various applications including drug-delivery, directed self-assembly and mechanical reinforcement applications. The surfaces of inorganic particles were modified with polymers of different composition, chain length, graft density and polymer architecture depending on the specific needs of each project. The surface modifications were mainly achieved by surface-initiated reversible addition fragmentation chain transfer (RAFT) polymerization, which is a very versatile technique to prepare nanocomposites with desired properties.

The first part of this work (Chapters 2 & 3) focused on novel self-assembly techniques. Chapter 2 described the design and characterization of a …

Investigating The Feedstock Properties And Process Conditions Influencing The Characteristics Of Products Generated From The Hydrothermal Carbonization Of Organic Feedstocks, Liang Li

Theses and Dissertations

Hydrothermal carbonization (HTC) is a novel environmentally beneficial thermal conversion process for the transformation of organic feedstocks to value-added products. However, little is known about the role of feedstock properties and/or process conditions during carbonization. This study was conducted to determine the parameters most influential during the HTC of organic feedstocks. Experiments and statistical analyses were conducted to: (1) determine the effect of specific feedstocks, feedstock interactions, and process conditions on carbonization product characteristics; (2) understand how initial liquid characteristics influence product characteristics and evaluate the significance of these initial liquid characteristics in predicting product characteristics; and (3) develop statistical …

Geometric Influence On Electronic Properties: Graphene With Antidots, Two-Dimensional Electron Gas And Three-Dimensional Carbon Nanostructures, Lei Wang

Theses and Dissertations

Geometric influence on electrical and magneto transport properties has been investigated in three types of systems: (i) Graphene, a single layer of carbon atoms; (ii) Two-dimensional electron gas (2DEG) in AlInN/GaN heterostructure; and (iii) 3D carbon nanostructures, a special type of three-dimensional materials with spherical voids. Due to unique structures and energy dispersion relations, these three systems demonstrate distinct physical properties.

AlInN is the newest and amongst the widest band gap semiconductors. The 2DEG in AlInN/GaN heterostucture displays long transport lifetime along with conventional behaviors, including Shubnikov-de Haas (SdH) oscillation and weak localization. From SdH oscillation, the effective mass of …

Implementing The Constructed Scaffold Model: Hands-On Activity Units For Advanced Placement Calculus, Susan Scott

Theses and Dissertations

The purpose of the present action research study is to describe a hands-on activity model, named the Constructed Scaffold Model (CSM), used in an Advanced Placement Calculus class in a southeastern United States suburban high school. Data were collected over an 8-week period during the spring 2017 semester. The teacher-researcher developed a pretest and posttest to describe the CSM’s impact on 10 student-participants in her Advanced Placement classroom. Repeated measures t-tests were used to determine the effect of the CSM on the student-participants’ test scores. Additional qualitative data were collected from field notes, student surveys, a focus group, and student …

Theoretical Investigation Of The Catalytic Hydrodeoxygenation Of Levulinic Acid Over Ru (0001) Catalyst Surface, Osman Mamun

Theses and Dissertations

Due to the rapidly declining fossil fuel reserves and the onset of global climate change, the development of active, selective, and stable catalytic materials for the efficient production of biomass derived platform chemicals, i.e., levulinic acid (LA), succinic acid (SA), γ-valerolactone (GVL) etc., is receiving considerable attention in order to produce second generation biofuels and commodity chemicals. Though solid lignocellulosic biomass is significantly cheaper than petroleum; however, the available technology is the significant barrier for large scale utilization of biomass for the production of biofuels. The development of biomass conversion technology requires, 1) identification of potential biomass chemicals that can …

Distributed Optimization Method For Intelligent Control Of Dc Microgrids, Yuanyuan Fan

Theses and Dissertations

Most of the distributed energy resources, loads and energy storage systems in a DC microgrid are equipped with power electronic converters. With the integration of advanced power electronics devices, a microgrid is able to utilize a broader range of technologies in its design and operation. A key feature of power electronic converter based systems is the ability to direct energy flow within a system with their coordinated operation. A system level control is needed for coordination where converters execute reference points dictated by a system-level control in order to achieve system level goals. System goals can be expressed as a …

Mechanical Characterization And Non-Destructive Evaluation Of Sicf-Sicm Composite Tubing With The Impulse Excitation Technique, Nathaniel Truesdale

Theses and Dissertations

With growing interest on ceramic fiber reinforced ceramic matrix composites (CMC) for accident tolerant fuel, the need for mechanical characterization of ceramic composite arises. It has been of particular interest to non-destructively evaluate the mechanical performance of these composites. Impulse excitation (IE) is a well-established method for non-destructive mechanical characterization of homogeneous isotropic material of well-defined shapes. In this thesis, impulse excitation technique was applied for non-destructive characterization of composite tube for the first time as far as we know. CMC, when stressed beyond its damage threshold, will experience various forms of structural damage, such as matrix micro-cracking, fiber-matrix debonding, …

Climate Change (Mal)Adaptation As Governmentality: The Case Of The Ada Sea Defense System In The Volta River Delta Of Ghana, Kwame Ntiri Owusu-Daaku

Theses and Dissertations

River deltas are complex natural environments that represent a confluence of many physical, biological and human processes vulnerable to the impacts of climate change. The likely biophysical impacts of climate change on deltas have received substantial attention. However, relatively little attention has been paid to the ways in which the different stakeholders of deltaic environments frame the vulnerability of residents of deltas to climate change. The Volta River Delta (VRD) of Ghana is a compelling site in which to conduct such an examination because of the clear climaterelated changes taking place in the Delta, and the fact that like many …

Exploring The Role Of Culture In Online Searching Behavior From A Cognitive Perspective, Sara Chizari

Theses and Dissertations

This research investigates differences in Web search behavior from a “cultural cognition” perspective, which was introduced by Nisbett and Norenzayan (2002). To explore the impact of culture and thinking styles on searching behavior is the objective. The overarching hypothesis is that there are cultural differences in cognitive styles and that these differences may lead into different searching behaviors. The findings help search engine designers provide an adaptive navigation support to users from different cultural backgrounds and cognitive styles. The fundamental research question underpinning this research becomes what are the relationships between users’ cognitive styles and cultural background, and their Web …

Redirecting P450 Ferryl-Oxo Intermediates From Oxygenation To Decarboxylation, Job Logan Grant

Theses and Dissertations

A recently discovered cytochrome P450 has garnered much interest for its ability to oxidatively decarboxylate n length fatty acids to n-1 terminal olefins using hydrogen peroxide as an oxidant. This enzyme (P450 OleT) is mechanistically peculiar, as it seemingly abrogates the oxygen insertion chemistry that typifies the P450 superfamily. In this work we explore the origin of this deviant catalysis.

Using stopped-flow and transient kinetic methodologies the ferryl-oxo pi-cation radical and ferryl-hydroxo intermediates, known as compound-I (Cpd-I) and compound-II (Cpd-II) respectively, were isolated in high yield. This is the first time either species has been observed in a substrate bound …

Nondestructive Evaluation And Health Monitoring Of Adhesively Bonded Composite Structures, William Walker Roth

Theses and Dissertations

As the growth of fiber reinforced composite materials continues in many industries, structural designers will have to look to new methods of joining components. In order to take full advantage of composite materials, such as increased stiffness, decreased weight, tailored material properties and increased fatigue life, mechanical fasteners will need to be replaced by adhesive bonding or welding, when possible. Mechanical fasteners require the drilling of holes, which damages the laminate and becomes the source of further fatigue damage. Also, an increase in laminate thickness or inclusion of other features is required for the material to withstand the bearing stress …

Polymer Grafted Nanoparticles For Designed Interfaces In Polymer Nanocomposites, Mohammad Mohammadkhani

Theses and Dissertations

This dissertation presents the design, synthesis, and characterization of polymer nanocomposite interfaces and the property enhancement from this interface design. Through the use of reversible addition fragmentation chain transfer (RAFT) polymerization for the grafting of polymer chains to silica nanoparticles, the surface of silica nanoparticles can be manipulated to tune the properties of nanocomposites by controlling the interface between the particles and the polymer matrix.

In the first part of this work, compatibility of 15 nm silica nanoparticles grafted with different alkyl methacrylates with linear low density polyethylene was investigated. SI-RAFT polymerization of hexyl, lauryl, and stearyl methacrylate on silica …

Evaluation Of Goodness-Of-Fit Tests For The Cox Proportional Hazards Model With Time-Varying Covariates, Shanshan Hong

Theses and Dissertations

The proportional hazards (PH) model, proposed by Cox (1972), is one of the most popular survival models for analyzing time-to-event data. To use the PH model properly, one must examine whether the data satisfy the PH assumption. An alternative model should be suggested if the PH assumption is invalid. The main purpose of this thesis is to examine the performance of five existing methods for assessing the PH assumption. Through extensive simulations, the powers of five different existing methods are compared; these methods include the likelihood ratio test, the Schoenfeld residuals test, the scaled Schoenfeld residuals test, Lin et al. …

Flipped Classroom Pedagogical Model And Middle-Level Mathematics Achievment: An Action Research Study, Cassondra Leo

Theses and Dissertations

Flipped Classroom Pedagogical Model and Middle-Level Mathematics Achievement: An Action Research Study describes an integers and rational numbers unit (TIRN) over a sixweek period in a seventh-grade flipped mathematics classroom. The identified problem of practice centers on these twenty-three student participants’ low achievement on math tests. The purpose of the study is to determine the relationship between a flipped classroom pedagogy and student achievement. The participant-researcher aimed to differentiate instruction for these seventh-grade student-participants using a flipped model that included videos. This flipped classroom pedagogical model allowed for additional time for the participant-researcher to assist struggling student-participants and to foster …

Determination And Validation Of High-Pressure Equilibrium Adsorption Isotherms Via A Volumetric System, Hind Jihad Kadhim Shabbani

Theses and Dissertations

Adsorption equilibrium isotherms for N2, CO2, and CH4 on zeolite 13X were investigated at three different temperatures (25.5, 50.5 and 75.5 ̊ C) and a pressure range of (0-6.89475) MPa for CH4 and N2 and in the range of (0-4.82633) MPa for CO2 using built in volumetric apparatus. The results were validated using with a volumetric system (ASAP) at the same temperatures and a pressure up to (160-110) KPa respectively. The experimental results were correlated using three process Langmuir (TPLM). The correlated isotherms were then used to calculate the isosteric heat of adsorption for the three gases on 13X. The …

The Impact Of One-To-One Ipad Instruction On Student Engagement, Sherri Herbst

Theses and Dissertations

The action research study describes the experiences of 14 elementary students using one-to-one (1:1) iPad instruction to engage in learning Spanish as a second language (L2). The student-participants used 1:1 iPads to learn Spanish over an 8 week unit of study. Data was comprised of scores from a student-participant engagement rubric scored by the teacher-participant before and after the study as well as summative structured surveys with student-participants to determine their perceptions of the iPad unit. Data were also collected in participant-researcher’s daily field notes and journal entries. Formative self-reflective journals were also kept by student-participants. Summative artifacts were collected …

Archival Resistance: A Comparative Reading Of Ulysses And One Hundred Years Of Solitude, Maria-Josee Mendez

Theses and Dissertations

Much of the comparative scholarship on the works of Gabriel García Márquez assumes the position that he was most significantly influenced by the works of William Faulkner and Ernest Hemingway. However, beyond the citation of techniques shared extensively by other Modernists and dependence upon superficial comparisons between texts, the connections between García Márquez and these writers frequently remain tenuous. I suggest that to privilege Faulknerian or Hemingwayan readings of García Márquez is to overlook his position as a postcolonial Latin American novelist; I therefore consider in relationship with García Márquez the Irish writer James Joyce. Both writers participate in what …

Stilbenes: Therapeutic Interventions Targeting Amyloid Β Protein Aggregation In Alzheimer’S Disease, Yiying Wang

Theses and Dissertations

Alzheimer’s disease (AD) is the most common form of dementia and accounts for 60-80 % of all dementia cases. In the United States, AD is ranked as the 6th leading cause of death and it is the only one among the top 10 that cannot be prevented, treated or even slowed. All FDA approved drugs focus on attenuating the symptoms for a limited time by regulating neurotransmitters without any intervention with the underlying disease process. A major player in the initiation and development of this debilitating disorder is the misfolding and subsequent aggregating of amyloid-β (Aβ) peptide. This aggregation process …

A Lebesgue Sampling Based Diagnosis And Prognosis Methodology With Application To Lithium-Ion Batteries, Wuzhao Yan

Theses and Dissertations

Fault diagnosis and prognosis (FDP) plays an important role in the modern complex industrial systems to maintain their reliability, safety, and availability. Diagnosis aims to monitor the fault state of the component or the system in real-time. Prognosis refers to the generation of long-term predictions that describe the evolution of a fault and the estimation of the remaining useful life (RUL) of a failing component or subsystem.

Traditional Riemann sampling-based FDP (RS-FDP) takes samples and executes algorithms in periodic time intervals and, in most cases, requires significant computational resources. This makes it difficult or even impossible to implement RS-FDP algorithms …