Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Discipline
Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 1257511 - 1257540 of 5211371

Full-Text Articles in Entire DC Network

Evaluation Of A Wearable Activity Schedule For Promoting Independent Play In Children With Autism Spectrum Disorder, Basak Topcuoglu May 2019

Evaluation Of A Wearable Activity Schedule For Promoting Independent Play In Children With Autism Spectrum Disorder, Basak Topcuoglu

Theses and Dissertations

Activity schedules are an antecedent intervention in which a series of visual cues, presented typically in booklets or binders, function as prompts for steps in a behavior chain (e.g., classroom routine, playing hide and seek). Although activity schedules are useful in getting individuals to manage their own behaviors, their typical presentation format can be cumbersome and stigmatizing for children placed in general education classrooms, placing additional barriers for independence and inclusion across environments for these children. Some researchers have used electronic devices such as tablets to display activity schedules, and although more socially acceptable, these are still cumbersome for young …

Go to article

Discrimination Training To Produce Emergent Relations Of Pre-Algebraic Math Skills, Jeanine Rinda Tanz May 2019

Discrimination Training To Produce Emergent Relations Of Pre-Algebraic Math Skills, Jeanine Rinda Tanz

Theses and Dissertations

Individuals diagnosed with Autism Spectrum Disorder (ASD) often have deficits with respect to generalization of skills. Procedures designed to induce stimulus equivalence have been shown to promote generalization. This study used a modified multiple probe design with an embedded multiple schedule to: (a) compare one-to-many (OTM) and many-to-one (MTO) training structures to determine which structure results in more positive equivalence outcomes when all variables are held constant, and (b) determine the extent to which children with ASD demonstrate stimulus equivalence and stimulus class mergers when using educationally relevant stimuli. Four children with ASD were taught two classes of stimuli (Class …

Go to article

Strategic Communication Campaign For Foreign Properties Restitution Programs, Quoc Tuan Nguyen May 2019

Strategic Communication Campaign For Foreign Properties Restitution Programs, Quoc Tuan Nguyen

Theses and Dissertations

U.S. laws allow citizens to seek compensation for their properties seized by a foreign nation through foreign settlement claims headed by a special commission under the Department of Justice. Only Congress or the Secretary of State could request this commission to open settlement claims programs. This project aims to improve communication outreach for a nonprofit, Boat People SOS, in its campaign to seek compensation for Vietnamese Americans whose properties have been confiscated by the Vietnamese government. The design project will provide an analysis, an execution plan and also consists of a package of informational products such as brochures, Power Point …

Go to article

Work-Family Centrality Profile And Its Moderating Role On The Effects Of Work-Family Conflict, Anqi Li May 2019

Work-Family Centrality Profile And Its Moderating Role On The Effects Of Work-Family Conflict, Anqi Li

Theses and Dissertations

This dissertation employs latent profile analysis to explore potential work-family centrality profiles and its associated antecedents, distal outcomes, as well as its interaction effect with work-family conflict in shaping match-domain outcomes. Stemmed from the identity theory (Stryker, 1968, 1980), work centrality and family centrality describe how central an individual places identities associated with work roles and family roles relatively to one’s overall identity, respectively. A person’s work-family centrality profiles is configured by one’s standings on work centrality and family centrality simultaneously. Two studies were conducted in this dissertation. Study 1 followed the three-step approach to latent profile analysis (Asparouhov & …

Go to article

Unmanned Aerial System Integration Into The National Airspace System And Airports: Risk Mitigation Using Content Analysis Methodology, Bhoomin Bhupendrabhai Chauhan May 2019

Unmanned Aerial System Integration Into The National Airspace System And Airports: Risk Mitigation Using Content Analysis Methodology, Bhoomin Bhupendrabhai Chauhan

Theses and Dissertations

Over the last few years, the use of unmanned aerial systems (UAS) has significantly increased. With an increase in the use of UASs, the number of UAS sightings near manned aircraft and airports have also increased, as shown by the Federal Aviation Administration (FAA)(FAA, 2019a). Although not every near sighting had a severe consequence associated with it, the risks were still present. As UASs are becoming more readily available to the general public, the risks present due to UASs flying in the National Airspace System (NAS) and near airports is also increasing. For the study, incident and accident reports were …

Go to article

Factors Related To The Assessment Of The Effectiveness Of Environmental Management Systems (Ems) At Airports, Kainan Li May 2019

Factors Related To The Assessment Of The Effectiveness Of Environmental Management Systems (Ems) At Airports, Kainan Li

Theses and Dissertations

The purpose of this study was to identify factors that can be used to assess the effectiveness of EMS at airports in the United States (U.S.). A survey research methodology was used for this study in two phases. The first phase of the research study included a preliminary expert opinion survey of airport managers and other individuals acting in a supervisory role to determine and discuss how EMS help improve environmental performance, and ranked factors that may be related to assessing the effectiveness of EMS. The second survey was constructed based on feedback from these experts and targeted airport employees …

Go to article

Aviation Professionalism: Examining The Concept Of Professionalism Within And Between Major Subgroups Of The Aviation Industry, Rüştü Tolga Turgut May 2019

Aviation Professionalism: Examining The Concept Of Professionalism Within And Between Major Subgroups Of The Aviation Industry, Rüştü Tolga Turgut

Theses and Dissertations

The purpose of this study was to conduct a secondary analysis of Alhallaf’s (2016) study on aviation professionalism by disaggregating his data into five subgroups: Aircraft Maintenance Technicians (AMT); Airport Managers (AM); Air Traffic Controllers (ATC); Non-Pilot Aviation Employees (NPAE), which consisted of business aviation, flight operations, and aviation colleges/universities; and Pilots. The study posed three research questions and endeavored to (a) determine factors related to professionalism in each subgroup, (b) determine the differences in levels of professionalism among the subgroups, and (c) examine each subgroup’ perceptions of professionalism. The study used an explanatory correlational design to determine the relationship …

Go to article

Mitigating Risk Tolerance Among General Aviation Pilots: Identifying Factors That Contribute To Ga Pilots’ Risk Perception, Nazif Sani Nuhu May 2019

Mitigating Risk Tolerance Among General Aviation Pilots: Identifying Factors That Contribute To Ga Pilots’ Risk Perception, Nazif Sani Nuhu

Theses and Dissertations

The purpose of this study was to identify factors that contributed to general aviation (GA) pilots’ level of risk perception, which could then be manifested as an increase in risk tolerance. The study used an explanatory correlational design to determine what factors were related to risk perception. Research factors included gender, age, marital status, race/ethnicity, education level, flight hours, single- and multi-engine hours, hours as PIC, type of flight training, number of FAA licenses/ratings, number of hazardous events pilots were involved in, self-efficacy, aviation safety attitudes, level of psychological distress, and locus of control. The dependent variable was risk perception. …

Go to article

Transforming Human Resource Management Into A Dynamic Capability And The Effects On Employee Attraction And Retention, William Ricardo Jimenez May 2019

Transforming Human Resource Management Into A Dynamic Capability And The Effects On Employee Attraction And Retention, William Ricardo Jimenez

Theses and Dissertations

Employee attraction and retention remain one of the biggest difficulties faced by employers in the United States. One way for firms to combat this issue is through the creation of dynamic capabilities. Dynamic capabilities are processes developed by a company that are based on its history, asset positioning, and process changes which could potentially lead firms to a competitive advantage. The purpose of this study was to explore whether a dynamic capability could be created through a firm’s Human Resource Management (HRM). More specifically, the study examined the relationship between a business’s HRM through the creation of a dynamic capability …

Go to article

Training Caregivers To Implement A Structured Meal Protocol To Decrease Food Selectivity Among Young Children With Autism, Ronald Joseph Clark May 2019

Training Caregivers To Implement A Structured Meal Protocol To Decrease Food Selectivity Among Young Children With Autism, Ronald Joseph Clark

Theses and Dissertations

This study evaluated a method of training caregivers to implement the Structured Meal protocol to treat children with autism who exhibit food selectivity. A treatment package consisting of written instructions and video modeling as well as in-vivo prompting and feedback (when necessary) was used to teach participants to conduct the protocol. A multiple baseline design across participants was used to evaluate the effects of training. In addition to the primary dependent variable (i.e., correct caregiver implementation of the Structured Meal protocol), data on three secondary dependent variables (i.e., child bite acceptance, mouth cleans, and inappropriate mealtime behavior) were collected. Results …

Go to article

Residence Time Distribution (Rtd) Analysis Of A Bioreactor's External Recirculation Loop For A Tissue Engineering Test Bed, Adrien Hosking May 2019

Residence Time Distribution (Rtd) Analysis Of A Bioreactor's External Recirculation Loop For A Tissue Engineering Test Bed, Adrien Hosking

Theses and Dissertations

Currently, in tissue engineering, the focus is on morphing cells into a particular type of tissue by hand, rather than automating the process. Automating cell feeding and waste removal, alone, still requires the removal of cells from their culture to perform imaging and analysis. Without the ability to automate the imaging in a way that does not risk cell death, the advantages of automating the feeding and waste removal are largely lost. By building a fully automated tissue engineering test bed, the capacity for cell reproducibility and cell yield increases significantly. This thesis outlines the design, some initial testing, and …

Go to article

Synthesis Of Photoactive Molecules And Silicon Containing Compounds, Mozhgan Navidi May 2019

Synthesis Of Photoactive Molecules And Silicon Containing Compounds, Mozhgan Navidi

Theses and Dissertations

Retinoids are a class of synthetic and natural molecules that are functionally and structurally related to Vitamin A. They have various biological roles and potential therapeutic values. Providing treatment for eye diseases requires more detailed understanding of the visual process. However, investigating every aspect of the visual phenomenon is constrained by the difficulties involved in the synthesis of pure retinoids with the desired stereochemistry. Therefore, developing a suitable and valuable synthetic route for 11-cis-retinal and its analogues is highly desirable. The first chapter of this dissertation explains new synthetic pathways for 11-cisretinal. In addition, the total synthesis of stereoselectively deuterium-labeled …

Go to article

Photocleavable Endogenous And Exogenous Molecules, Charitha Madhusanka Guruge May 2019

Photocleavable Endogenous And Exogenous Molecules, Charitha Madhusanka Guruge

Theses and Dissertations

The spatiotemporal regulation of biomolecules in their physiological environment is an essential aspect of biological research. In neuroscience, the activity of neurotransmitters can be regulated by protecting the molecules with photoresponsive protecting groups (PPGs), also known as cages. Diverse set of PPGs have been developed for caging of biomolecules. PPGs can be categorized based on their absorbing wavelengths (ranging from UV to near-IR) and photochemical properties (quantum yield, photo-cross section, solubility). PPGs absorb light and undergo intramolecular electron transitions and bond rearrangements that result in the release of the caged substrates. Hence, the caging of a specific substrate is unique …

Go to article

Application Of The Gradient Projection Method To An Optimal Control Problem In Quantum Biology, Rashad Abdulla May 2019

Application Of The Gradient Projection Method To An Optimal Control Problem In Quantum Biology, Rashad Abdulla

Theses and Dissertations

Quantum biology is an emerging field which seeks to understand and analyze the effects of quantum mechanical phenomena on biological systems. One such phenomenon is the formation of radical pairs, compounds which exist in a quantum superposition of two states until they collapse into one or the other. The probability of the collapse into a preferred state can be calculated from the Schrödinger equation, and is in fact dependent on external magnetic fields. This project utilizes principles of mathematical optimal control and quantum biology to determine the precise sequence of magnetic field pulses that maximize the probability of achieving the …

Go to article

First Hop Redundancy Protocols (Fhrp), Raghad Faisal Alshehri May 2019

First Hop Redundancy Protocols (Fhrp), Raghad Faisal Alshehri

Theses and Dissertations

When a network is designed, the most important thing that is always kept in mind is the factor of availability. However, a lot of researchers are still working on managing and implementing more dependable networks are resilient to severe failovers and can cope up under immense traffic loads. With that being said, a lot of questions still need to be answered according to the financial and implementation point of view. Correspondingly, the current study aims at answering all these questions and providing with the best optimal solutions to deploy dependable networks primary aimed towards hardening and enforcing various techniques and …

Go to article

Performance Evaluation Of 3rd Normal Form Decompositions, Ben Mathew May 2019

Performance Evaluation Of 3rd Normal Form Decompositions, Ben Mathew

Theses and Dissertations

When a relational database is chosen, normalization theory is a set of guidelines that may lead to efficient database designs. Thus, normalization of tables in a database is a common process used for the analysis of relational databases. Sufficient normalization of databases aims to decompose existing relational tables in order to minimize database redundancy while preserving dependencies between attributes. It also facilitates correct insertion, deletion, and modification of data in the database. Given an un-normalized relational database, a redesign with no data redundancy and which is guaranteed to preserve dependencies is not always achievable. Previous studies have shown that it …

Go to article

Establishing A People Qualification Framework At Embraer Executive Aircraft, Inc., Yassine Rayad May 2019

Establishing A People Qualification Framework At Embraer Executive Aircraft, Inc., Yassine Rayad

Theses and Dissertations

Technical training in the aviation industry is a multi-faceted and complex topic. Research efforts in aviation maintenance training are extensive, however, we observe a paucity of studies directly focused on aircraft manufacturing environments. Nevertheless, the recent growth of the training industry and the advent of more disruptive technologies such as virtual and augmented reality solutions are making training program design efforts more and more relevant. The research and design contributions presented in this thesis focus on the establishment of a people qualification framework at a local aircraft final assembly and testing plant in Melbourne, FL. The design thinking cycle was …

Go to article

Hybrid Long-Range Mid-Infrared Hyperbolic Phonon Polariton Waveguide Using Hexagonal Boron Nitride, Di Xiong May 2019

Hybrid Long-Range Mid-Infrared Hyperbolic Phonon Polariton Waveguide Using Hexagonal Boron Nitride, Di Xiong

Theses and Dissertations

For any photonic-on-chip applications long propagation waveguides are critical. The use of plasmon polaritons for near-infrared and optical networks has been extensively studied for the purpose of achieving long propagation lengths, however, due to plasmonic polariton effects being negligible in mid- to long-wave infrared (IR) applications, phonon polaritons are required. In recent years, extensive research has been carried out on hexagonal boron nitride (h-BN), and it has been found that h-BN has naturally occurring sub-range phonon volume-constrained hyperbolic phonon polaritons (HPhPs). The numerical results in this thesis show both the long-range and short-range phonon volume polaritons modes in h-BN. A …

Go to article

Encryption Algorithms For Data Security In Local Area Network, Asmaa Essam Alhibshi May 2019

Encryption Algorithms For Data Security In Local Area Network, Asmaa Essam Alhibshi

Theses and Dissertations

Cryptography plays an important part in data and information security. An overview of cryptography is given in the paper. This paper tries to compare most commonly used encryption algorithms RSA and AES, with their performance analysis on java and C++. At first a brief introduction on types of cryptography i.e. symmetric and asymmetric encryption algorithm. Then previous work on these encryption algorithms is discussed and their performance comparison in the form of table is given. Then the objectives of this thesis is given. In chapter 3, a detailed description of ciphering algorithms, RSA, AES, TCP and UDP is provided. Chapter …

Go to article

Weak Turbulence Closures In Incompressible Magnetohydrodynamics, Augustus Antanas Azelis May 2019

Weak Turbulence Closures In Incompressible Magnetohydrodynamics, Augustus Antanas Azelis

Theses and Dissertations

In this work we apply the weak turbulence closure to the governing equation of incompressible homogeneous magnetohydrodynamics (MHD). It was originally thought that the method lacked applicability to linearly dispersive waves however MHD presents a unique exception to this notion. A perturbative scheme is used in combination with multiple scale analysis to find a dynamic equation for the wavenumber energy spectrum corresponding to weakly non-linear shear Alfv´enic turbulence. We begin by deriving an equation describing the time evolution of the Fourier transformed Els¨asser fields associated with linear propagation and non-linear interactions between counter-propagating Alfv´en waves. A cumulant hierarchy is then …

Go to article

Study Of A Crew Transfer Vehicle Using Aerocapture For Cycler Based Exploration Of Mars, Larissa Balestrero Machado May 2019

Study Of A Crew Transfer Vehicle Using Aerocapture For Cycler Based Exploration Of Mars, Larissa Balestrero Machado

Theses and Dissertations

This thesis presents the results of a conceptual design and aerocapture analysis for a Crew Transfer Vehicle (CTV) designed to carry humans between Earth or Mars and a spacecraft on an Earth-Mars cycler trajectory. The thesis outlines a parametric design model for the Crew Transfer Vehicle and presents concepts for the integration of aerocapture maneuvers within a sustainable cycler architecture. The parametric design study is focused on reducing propellant demand and thus the overall mass of the system and cost of the mission. This is accomplished by using a combination of propulsive and aerodynamic braking for insertion into a low …

Go to article

Deep Space Radiation Shelter Through Magnetic Shielding, Lauren Elizabeth Eastberg Persons May 2019

Deep Space Radiation Shelter Through Magnetic Shielding, Lauren Elizabeth Eastberg Persons

Theses and Dissertations

As human space exploration begins to reach beyond Earth for the first time in 50 years, we must prepare for the eventuality of long-duration missions outside the protection of Earth's magnetic field. In interplanetary space astronauts are exposed to highly energetic galactic cosmic radiation, most commonly in the range of 1-GeV protons. Present day shielding technologies are not sufficient to protect astronauts against such particles; as such, the following paper proposes an alternate method of creating deep space radiation shelters through the use of magnetic shielding. Using a series of circular superconducting loops arranged in the shape of a shell, …

Go to article

Damping Coefficient Sensitivity Analysis Of High Rebound Soils In Florida, Aline Franqui May 2019

Damping Coefficient Sensitivity Analysis Of High Rebound Soils In Florida, Aline Franqui

Theses and Dissertations

The dynamic response of soils is related to a damping factor, which represents the energy absorbed by the soil as the pile moves. Certain blends of fine sands, silts and clays are producing pile rebound during driving. For that reason, the objective of this thesis is to conduct a damping coefficient sensitivity analysis of high rebound soils in Florida. Forty cyclic triaxial tests from six sites in Central and Northern Florida were analyzed to evaluate damping. Two approaches were used, one based on the change in stress over time and a second based on the viscous energy absorbed per cycle. …

Go to article

Effect Of Industry Clusters And Commodity Flow Characteristics On The Selection Of Freight Transportation Modes In The United States With Advanced Econometric Approaches, Taleb Eissa Ali Eissa May 2019

Effect Of Industry Clusters And Commodity Flow Characteristics On The Selection Of Freight Transportation Modes In The United States With Advanced Econometric Approaches, Taleb Eissa Ali Eissa

Theses and Dissertations

Mode choice is an important strategic decision for shippers to carry commodities efficiently. Freight mode-choice is an important activity to develop a successful freight transportation business in the private sector and to plan for economically consistent freight transportation infrastructures in the public sector. Freight activities result from the complex interactions between different economic agents, but these relationships are commonly relaxed to account for three major agents: shippers, carriers and receivers. Furthermore, the behavior of freight choice is commonly not concentrated in one agent, but rather is divided jointly over multiple individuals and firms in a logistics process, each component of …

Go to article

Simulation Environment For Astrobee-Rings System, Tamerlan Yeleussizov May 2019

Simulation Environment For Astrobee-Rings System, Tamerlan Yeleussizov

Theses and Dissertations

The thesis analyzes a flight software of a new free flying robot Astrobee, that will change the current Synchronized Position Hold Engage Reorient Experimental Satellites (SPHERES) on International Space Station (ISS). First, the main components of the flight software were examined: Robotic Operating System (ROS), Gazebo and MATLAB. During that phase, functionalities of ROS, Gazebo and MATLAB were analyzed, and it was found how these components integrate between each other to build Astrobee flying software. Next, simulation of two Astrobees performing “in-home” and “torque” maneuvers was executed. After a successful completion of simulation, results of Astrobee’s trajectory was recorded. Then, …

Go to article

Modeling Of Hurricane-Induced Interior And Contents Damage And Associated Time-Related Expenses To Residential Buildings, Roberto Vicente Silva De Abreu May 2019

Modeling Of Hurricane-Induced Interior And Contents Damage And Associated Time-Related Expenses To Residential Buildings, Roberto Vicente Silva De Abreu

Theses and Dissertations

Hurricanes are a main cause of economic losses in many parts of the world, including the state of Florida. They affect the exterior, interior, and the contents of residential buildings. The damage of the interior can be as much as half of the total damage, but the estimation of the interior damage is still somewhat crude. Most damage models estimate interior damage as a percentage of the exterior damage, or through simple relationships, that relate the height of water ingress in the building to the interior damage. The current version of the Commercial Low-Rise Residential vulnerability model (CLR) of the …

Go to article

A Mixed Method Study On The Impact Of Industry Sponsored Projects On Senior Capstone Design Student’S Motivational Factors, Devanshi Shah May 2019

A Mixed Method Study On The Impact Of Industry Sponsored Projects On Senior Capstone Design Student’S Motivational Factors, Devanshi Shah

Theses and Dissertations

This thesis examines the change in student motivation through a yearlong senior capstone design course with respect to their choice of project type. The senior capstone design projects offered at the university fall into one of two major project types: industry sponsored and nonindustry sponsored. The students opt for either of the two major project types based on their interest and future career goals. The students were given an adapted version of Motivated Strategies for Learning Questionnaire (MSLQ) to self-identify their motivation levels by rating various questions on a 7-point Likert scale. The surveys were conducted at two different points …

Go to article

Airport Taxiway Traversal And Safety Optimization Using Combinatorics, Thore Groenlund Rasmussen May 2019

Airport Taxiway Traversal And Safety Optimization Using Combinatorics, Thore Groenlund Rasmussen

Theses and Dissertations

The demand for air travel has increased dramatically in the last decade, putting large strain on airports and their limited resources. Expanding the available resources at an airport is not always an option either due to location, budget or time. This forces the administrators of an airport system to use the limited resources as efficiently as possible. This thesis proposes a tool for air traffic controllers and pilots that can be used when planning taxiway systems. Taking inspiration from Dijkstra’s Algorithm, an algorithm is proposed to safely move aircraft from the terminal to the runway. Applying constraints to the algorithm …

Go to article

Vegetation Response To Intense Holocene Dry Events In The Andes And Amazon Basin, Majoi De Novaes Nascimento May 2019

Vegetation Response To Intense Holocene Dry Events In The Andes And Amazon Basin, Majoi De Novaes Nascimento

Theses and Dissertations

By using the natural laboratory of past climate change I ask: How resilient are extant tropical forest ecosystems to climatic forcing? Do tropical forests systems show gradualistic or threshold responses to past climate change? How do climate forcings change floristic composition? And do humans amplify or suppress the effects of natural climate variability through land use? My study is set in western Amazonia and in the eastern flank of the Andes, regions renowned for high endemism and cultural importance. The time scale of the study spans the Mid-Holocene Dry Event (MHDE, c. 9000 to 4000 years ago), arguably the most …

Go to article

Membrane Hull Technology Implemented Into A D-Collar Work Boat, Joshua Hagan May 2019

Membrane Hull Technology Implemented Into A D-Collar Work Boat, Joshua Hagan

Theses and Dissertations

Membrane Hull Technology (MHT) was initially developed for the United States Navy Rigid-Hull Inflatable Boats (RHIB) as an alternative structure design to provide weight savings and shock mitigation. MHT accomplishes this by veering away from traditional hull design and utilizing a grid like system with an increased number of longitudinal stringers and transverse frames with a significantly lower moment of inertia when compared to traditional stringers and bulkheads. The decrease in stiffness allows for increased deflection in the hull during high load events with the added benefit of shock absorption. This technology, developed by Structural Composites Inc., has been successfully …

Go to article

First Prev Next Last