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Cooperative Control Of Multi-Agent Systems; Stability, Optimality And Robustness, Kristian Hengster Movric Jan 2013

Cooperative Control Of Multi-Agent Systems; Stability, Optimality And Robustness, Kristian Hengster Movric

Electrical Engineering Dissertations - Archive

In this work design methods are given for distributed synchronization control of multi-agent systems on directed communication graphs. Conditions are derived based on the relation of the graph eigenvalues to a region in a complex plane that depends on the single-agent system and the solution of the local Riccati equation. The synchronizing region concept is used. Cooperative observer design, guaranteeing convergence of the local estimates to their true values, is also proposed. The notion of convergence region for distributed observers is introduced. A duality principle is shown to hold for distributed observers and controllers on balanced graph topologies. Application of …

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Dovetail: Stronger Anonymity In Next-Generation Internet Routing, Jody Mark Sankey Jan 2013

Dovetail: Stronger Anonymity In Next-Generation Internet Routing, Jody Mark Sankey

Computer Science and Engineering Theses - Archive

Current low-latency anonymity systems use complex overlay networks to conceal a user's IP address, introducing significant latency and network efficiency penalties compared to normal Internet usage. Rather than this obfuscation of network identity through higher level protocols, we recommend a more direct solution: a routing protocol that allows communication without exposing network identity, providing a strong foundation for Internet privacy, while allowing identity to be defined in those higher level protocols where it adds value. We propose Dovetail, a next-generation Internet routing protocol that provides anonymity against an active attacker located at any single point within the network. Key design …

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Lilac: Architecture For Anonymous Light Weight Communication, Ankit Upadhyaya Jan 2013

Lilac: Architecture For Anonymous Light Weight Communication, Ankit Upadhyaya

Computer Science and Engineering Theses - Archive

We present lilac; a circuit based low latency anonymous light weight instant messaging communication system. This browser based chat platform provides anonymity in context with unlinkability and unobservability for the secured real-time communication. The system uses a relay based anonymization mechanism where circuits are built and routed over a set of trusted nodes in the network. Unlike other typical instant messaging systems, Lilac uses user pseudonymity and ephemeral message exchange, which eliminates conventional user registration and storing the messages for the future retrieval; this leaves no footprints behind in the system in terms of user information, who talks to whom …

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Modeling An Intelligent Intruder In A Region Monitored By A Wireless Sensor Network, Sriram Srinivasan Jan 2013

Modeling An Intelligent Intruder In A Region Monitored By A Wireless Sensor Network, Sriram Srinivasan

Computer Science and Engineering Theses - Archive

Monitoring to detect unauthorized border crossing is very important for protecting national security. To accomplish this by continuous physical monitoring by border patrol agents is impractical. Networks of low-cost wireless sensors have been identified as a useful tool in monitoring with minimal human intervention. However, ensuring the effectiveness of unattended monitoring against an intelligent intruder is difficult, since the intruder can probe the system for weaknesses. To better understand the capabilities of such an intruder, we propose a model for an intelligent intruder whose purpose is to find a detection-free path across the border by which he could cross back …

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Effective Collaboration In Opportunitic Networks, Umair Sadiq Jan 2013

Effective Collaboration In Opportunitic Networks, Umair Sadiq

Computer Science and Engineering Dissertations - Archive

Opportunistic networks formed by users' mobile devices have the potential to exploit a rich set of distributed service components that can be composed to provide each user with a multitude of application level services. In opportunistic networks, tasks such as content sharing and service execution among remote devices are facilitated by intermediate devices capable of short–range wireless connectivity, also called relays that receive, move around, and forward the data.To enable effective collaboration in such an environment, we make three novel contributions: (i) an adaptive forwarding scheme, ProxiMol, to select suitable relays for data transfer; (ii) a distributed mechanism to select …

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Sparsity Enhanced Reconstruction Algorithms For Diffuse Optical Tomography, Jixing Yao Jan 2013

Sparsity Enhanced Reconstruction Algorithms For Diffuse Optical Tomography, Jixing Yao

Electrical Engineering Dissertations - Archive

Conventional reconstruction algorithms for diffuse optical tomography (DOT) is based on Tikhonov regularization method and the simple white Gaussian noise (WGN) assumption. These approaches usually lead to the following problems: 1. The reconstructed images are blurry; 2. In 3D reconstruction problems, the reconstructed objects are usually in the wrong depths; 3. The shape of a reconstructed object might be different from its original one due to the noise.In this work, after study the nature of DOT images as well as the data acquisition process, several sparsity regularization related reconstruction methods were developed to improve the spatial resolution as well as …

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Reliability Unit Commitment In Ercot Nodal Market, Hailong Hui Jan 2013

Reliability Unit Commitment In Ercot Nodal Market, Hailong Hui

Electrical Engineering Dissertations - Archive

The Electric Reliability Council of Texas (ERCOT) is the independent system operator (ISO) that ensures a reliable electric grid and efficient electricity markets in the ERCOT region. ERCOT has successfully transited from a zonal market to an advanced nodal market since Dec. 2010. In the new ERCOT nodal wholesale market, a reliability unit commitment (RUC) process has been designed and implemented to ensure transmission system reliability and security. The main objective of RUC is to ensure that enough resource capacity, in addition to ancillary service capacity, is committed in the right locations to reliably serve the forecasted load in the …

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Nanostructured Surfaces Using Thermal Nanoimprint Lithography: Applications In Thin Membrane Technology, Piezoelectric Energy Harvesting And Tactile Pressure Sensing, Bhargav Pradip Nabar Jan 2013

Nanostructured Surfaces Using Thermal Nanoimprint Lithography: Applications In Thin Membrane Technology, Piezoelectric Energy Harvesting And Tactile Pressure Sensing, Bhargav Pradip Nabar

Electrical Engineering Dissertations - Archive

Nanoimprint lighography (NIL) is emerging as a viable contender for fabrication of large-scale arrays of 5-500 nm features. The work presented in this dissertation aims to leverage the advantages of NIL for realization of novel Nano Electro Mechanical Systems (NEMS). The first application is a nanoporous membrane blood oxygenator system. A fabrication process for realization of thin nanoporous membranes using thermal nanoimprint lithography is presented. Suspended silicon nitried membranes were fabricated by Lowe-Pressure Chemical Vapor Deposition (LPCVD) in conjunction with a potassium hydroxide-based bulk michromachining process. Nanoscale features were imprinted into a commercially available thermoplastic polymer resist using a prefabricated …

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A Low-Noise, Low-Power Cmos Amperometric Circuit For Glucose Sensing, Niranjan Karandikar Jan 2013

A Low-Noise, Low-Power Cmos Amperometric Circuit For Glucose Sensing, Niranjan Karandikar

Electrical Engineering Dissertations - Archive

Diabetes is disorder associated with an insufficiency of insulin secretion. Large number of people around the world suffers from this disorder which can result into damages to eyes, kidneys, nerves and even death. One of the most common methods to detect the diabetes is to monitor the levels of glucose is the blood stream. Other biological fluids like tear fluid can also be used to detect levels of glucose. With emergence of MEMS technology several biosensors are developed, less invasive or non-invasive, which can detect these glucose levels from blood or tear. Central idea behind the developments of these biosensors …

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Sign Gesture Spotting In American Sign Language Using Dynamic Space Time Warping, Srujana Gattupalli Jan 2013

Sign Gesture Spotting In American Sign Language Using Dynamic Space Time Warping, Srujana Gattupalli

Computer Science and Engineering Theses - Archive

American Sign Language (ASL) is the primary sign language used by approximately 500,000 deaf and hearing-impaired people in the United States and Canada. ASL is a visually perceived, gesture-based language that employs signs made by moving the hands combined with facial expressions and postures of the body. There are several software tools available online to learn signs for a given word but there is no software that gives the meaning of any sign video. If we need to search or look up documents containing any word we can just type it in search engines like Google, Bing etc. but if …

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Development And Simulation Of Focus Of Attention Using Reinforcement Learning And Function Approximation, Stephen Ratz Jan 2013

Development And Simulation Of Focus Of Attention Using Reinforcement Learning And Function Approximation, Stephen Ratz

Computer Science and Engineering Theses - Archive

Without short-term memory, people would have little hope to learn and accomplish tasks. The same can be said for artificially intelligent agents. Often referred as Miller's Law, the number of working objects that a human can hold in working memory is around seven. For an AI agent, the cost of keeping additional memory blocks is exponential. Other issues to consider are what to keep in memory and for how long. Only a few of many of an agent's previous steps may be important to hold on to. This thesis project attempts to train an intelligent agent to learn what to …

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The Heir And The Spare: Education And Preparation Among England's "Sudden Monarchs", Lindsay Ridlehuber Jan 2013

The Heir And The Spare: Education And Preparation Among England's "Sudden Monarchs", Lindsay Ridlehuber

History Theses - Archive

The English royal family is experiencing a recent surge of popularity. Though they no longer personally govern England, their role is still crucial within the country. The current heir to the throne, Prince Charles, is expected to inherit peacefully upon the death of Elizabeth II. However, there has been speculation that he could be passed over for his far more popular son Prince William. If this does occur, it will not be the first time that a monarch who was not the primary heir inherited the English throne. Eight times in the period between 1100 and 1701 the primary heir …

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"God Help Us, We Are The Press!": Public Perception Of The Branch Davidian Conflict, Janet Rogers Jan 2013

"God Help Us, We Are The Press!": Public Perception Of The Branch Davidian Conflict, Janet Rogers

History Theses - Archive

Public perception of the 1993 Branch Davidian conflict, particularly as it developed well after the event, helped to alter government policy toward New Religious Movements. Prior to the investigations following the conflict, public expectations of government involvement in New Religious Movements had been shaped most dramatically by the mass suicide in Jonestown, Guyana, in 1978. That event had convinced scholars and the public at large that New Religious movements had a propensity for violence, and government intervention was necessary on occasion. Thus following Jonestown, the Bureau of Alcohol, Tobacco and Firearms (ATF) became involved in several standoffs with New Religious …

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Implementation Of An Adaptive Block Filter On Sub-Blocks Of A Macroblock In H.264/Avc, Bhavana Prabhakar Jan 2013

Implementation Of An Adaptive Block Filter On Sub-Blocks Of A Macroblock In H.264/Avc, Bhavana Prabhakar

Electrical Engineering Theses - Archive

Plenty of coding tools are being developed to boost the efficiency of H.264/AVC. Some of these tools are implemented in the key technical area (KTA). The adaptive interpolation filter (AIF) [3], the high precision interpolation filter [5], and the adaptive loop filter (ALF) [4] have already been introduced in order to provide a more precise reference picture. Other efficient coding methods, such as the motion vector competition [6] and the extended macro-block (MB) [7], are also implemented in the KTA [16].In order to improve the coding efficiency of H.264/AVC, an adaptive prediction block filter (APBF) based on Wiener filter is …

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Embedded And Rf Powered Implantable Medical Device For Gastric Electrical Stimulation (Ges), Guru Moorthy Ravi Jan 2013

Embedded And Rf Powered Implantable Medical Device For Gastric Electrical Stimulation (Ges), Guru Moorthy Ravi

Electrical Engineering Theses - Archive

Gastric electrical stimulation (GES) has attracted significant attention in the treatment for Gastroparesis-a common disorder caused in patients suffering from diabetes, cancer and Parkinson's disease. Symptoms include vomiting, nausea, abdominal bloating etc. due to loss of motility in the stomach muscles. GES uses electrical pulses on the stomach tissues to help regain normal motility and reduce the symptoms. Conventional gastric stimulator needs a long surgery to be implanted and it is a big pacemaker like device that runs by a non-rechargeable battery. It has to be replaced once the battery gets exhausted every 5 to 6 years. Hence another round …

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Diagnosing Wi-Fi Association Issues And Optimizing Network Performance, Suma Subbarao Jan 2013

Diagnosing Wi-Fi Association Issues And Optimizing Network Performance, Suma Subbarao

Electrical Engineering Theses - Archive

Extensive deployment of Wi-Fi networks at homes and public places has triggered research interest in several aspects of Wi-Fi technology like deployment strategies and optimization. People use Wi-Fi or 802.11 networking, to connect their computers at home or office for instant internet access and it is a common scenario to have faced association and network congestion problems. Finding appropriate solution to these issues is a challenging task. In this thesis, an attempt has been made to solve Wi-Fi related concerns through a novel approach. Diagnosing problems occurring during the association process with the network and getting better throughput from the …

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Development Of A Mathematical Model, Vump (Vinasse Utilization For Methane Production), Lucina MáRcia-De-Mello Kuusisto Jan 2013

Development Of A Mathematical Model, Vump (Vinasse Utilization For Methane Production), Lucina MáRcia-De-Mello Kuusisto

Earth & Environmental Sciences Dissertations - Archive

Environmental pollution causes ongoing problems. Many countries are faced with the dilemma of finding alternative energy sources that are cost-effective and environmentally friendly. Biofuels have received much attention of late as potential alternative fuels. Although biofuels are indeed attractive energy sources, their manufacturing also brings environmental pollution. One of the most prominent biofuels is ethanol. In the US, the main feedstock for ethanol manufacturing is corn. In Brazil, as well as in some other countries, the main raw material is sugarcane. Although ethanol presents many advantages as a biofuel, including the fact that it is manufactured from renewable resources, there …

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Morphology, Mechanisms, And Processes For The Formation Of A Non-Bifurcating Fluvial-Deltaic Channel Prograding Into Grapevine Reservoir, Texas, Gary D. Tomanka Jan 2013

Morphology, Mechanisms, And Processes For The Formation Of A Non-Bifurcating Fluvial-Deltaic Channel Prograding Into Grapevine Reservoir, Texas, Gary D. Tomanka

Earth & Environmental Sciences Theses - Archive

Non-bifurcating channels in modern reservoirs, tie channels, and the Mississippi River Bird-Foot Delta share a common morphology that is likely due to an underlying common mechanism. Data analysis indicates that the Denton Creek Delta has prograded into Grapevine Reservoir for 56 years, adhering to the buried pre-impoundment channel without alteration. The hydrodynamic mechanism that controls this adherence is that of a turbulent jet. The properties of the turbulent jet create a dynamic two-phase process, whereby prodelta clays and rare mouth bar sands are eroded while the jet contemporaneously builds sandy levees. An upward tapering channel acts to focus and intensify …

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Motion And Rigidity Of The Caribbean Plate And Geodetic Observations Of Dominica, Lesser Antilles, Jamie Annette Miller Jan 2013

Motion And Rigidity Of The Caribbean Plate And Geodetic Observations Of Dominica, Lesser Antilles, Jamie Annette Miller

Earth & Environmental Sciences Dissertations - Archive

The currently accepted kinematic model of the Caribbean plate presented by DeMets et al. (2007), is based on velocities from 6 continuous and 14 campaign GPS sites. This work attempts to refine the current plate model by evaluating data from an expanded number of stations with an improved spatial distribution. As a measure to better constrain the eastern margin, a study has been conducted on the island of Dominica which includes campaign GPS data collected over the last decade. The analysis of data from 117 sites includes campaign data in addition to the data from the continuous GPS stations that …

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A Correlational Study Of A Reading Comprehension Program And Attrition Rates Of Esl Nursing Students In Texas, Wendy Morris Donnell Jan 2013

A Correlational Study Of A Reading Comprehension Program And Attrition Rates Of Esl Nursing Students In Texas, Wendy Morris Donnell

Nursing Dissertations - Archive

Decreasing the attrition rate of nursing students has become an important issue for programs in Texas as a means to alleviate the nursing shortage (THECB, 2009). Programs are admitting a more diverse group of students but attrition has historically been high among minority groups (Gilchrist & Rector, 2007). The purpose of this study was to examine the associations between English as a Second Language (ESL), a reading comprehension program, and attrition rates of nursing students. A secondary analysis of a large database which included nursing students from 27 initial licensure programs in Texas was completed. Jeffreys (2012) NURS model was …

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Point Modules Over Regular Graded Skew Clifford Algebras, Padmini Pillay Veerapen Jan 2013

Point Modules Over Regular Graded Skew Clifford Algebras, Padmini Pillay Veerapen

Mathematics Dissertations - Archive

In this thesis, I consider point modules over regular graded skew Clifford algebras.First, I define a notion of rank (called μ-rank) on noncommutative quadratic forms. To every (commutative) quadratic form is associated a symmetric matrix, and one has the standard notions of rank and determinant function defined on the matrix, and, thus, on the quadratic form. In 2010, in [15], the notion of quadratic form was extended to the noncommutative setting and a one-to-one correspondence was established between these quadratic forms and certain matrices. Using this generalization, I define a notion of rank (called μ-rank) for such noncommutative quadratic forms, …

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Appalachian Delta Plain Paleoecology Of The Cretaceous Woodbine Formation At The Arlington Archosaur Site, North Texas, Derek Jason Main Jan 2013

Appalachian Delta Plain Paleoecology Of The Cretaceous Woodbine Formation At The Arlington Archosaur Site, North Texas, Derek Jason Main

Earth & Environmental Sciences Dissertations - Archive

The Arlington Archosaur Site (AAS) is a North Texas fossil locality that preserves a Mid- Cretaceous ecosystem along a low lying coastal plain. The site lies within the Cenomanian (95 Mya) rocks of the Woodbine Formation in North Arlington, Tarrant County, TX. The depositional environment of the AAS is a coastal delta plain, principally a peat bog. The vertebrates recovered from the AAS include dinosauria (ornithopod and theropod), crocodyliform, chelonian and dipnoan. A large, nearly complete crocodyliform was excavated in the summer of 2009, and proved to be a new taxon; Deltasuchus motherali. The name of the new taxon was …

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Reducing Pb Bioaccessibility In Soil Through The Addition Of Apatite Ii, Zachary Robert Tondre Jan 2013

Reducing Pb Bioaccessibility In Soil Through The Addition Of Apatite Ii, Zachary Robert Tondre

Earth & Environmental Sciences Theses - Archive

This study was an investigation of the bioaccessibility of Pb in the presence of phosphate acting as an immobilizing constituent in the form of fish bone material, specifically Apatite II. Phosphate-induced Pb immobilization refers to the process by which Pb ions replace calcium ions and form insoluble Pb-phosphate. A commercially available A-horizon soil was spiked with dried Pb-bearing paint containing various Pb forms (e.g., carbonates, sulfates, and oxides). The paints were added to the soil at 2% weight for weight (w/w). The paints (in solid form) were initially ground and sieved through a <100 micron mesh to provide a <100 μm size fraction. Once a paint was mixed with a soil, typically in duplicate, replicates were either retained or further amended with Apatite II. Soil columns were created using a series of 250 mL syringes individually filled with each paint spiked soil sample, some of which were amended with Apatite II at 5% w/w. For six months the columns were eluted regularly with Milli-Q water and at six months, subsamples were removed from the top of each soil column in order to evaluate any change in potential bioaccessibility of the Pb associated with soil. Thus, this work focuses on the bioaccessibility of Pb in a group of soil column samples based on the weak acid solubility of the Pb in the soil, and on an electron microscopic analysis of the Pb in the soils. Each soil column sample was subjected to an in vitro relative bioaccessibility assessment (RBA), in which a simulated gastric fluid (SGF) was used to simulate and project the effects of digestion on the Pb contaminated soils. The SGF was intended to mimic the acidic quality of the human stomach and yields approximate results of how much Pb could potentially be released into the acid solution through human digestion. The SGF solution was essentially composed of hydrochloric acid (HCL) adjusted to a pH of 2.5. From the soil columns, 3g of soil were removed and 1g was added to 100 mL of SGF and then tumbled for 1 hour at 37°C in a modified toxicity characteristic leaching procedure system. After this time a sample of the fluid was collected an the amount of Pb in the fluid was measured. Photomicrographs of each soil column were obtained using a scanning electron microscope with a back-scattered electron detector and an energy dispersive x-ray spectrometer. These digital images were used to determine the chemical nature of various Pb-bearing constituents within each soil sample. This study concluded that the addition of Apatite II led to a reduction in the bioaccessibility of Pb in some of the test soils, determined through differences in in vitro RBA and through the recognition of Pb-phosphate particle phases in the soil samples. Previous studies have found that the addition of Apatite II as a remediation technique for Pb contaminated soil can be successful, however this is the first time that Pb contamination of the soil has been in the form of Pb-bearing paint. Furthermore, this study is notable for identifying changes in Pb bioaccessibility of Pb derived from Pb-bearing paint over the short time-span of six months.

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Impacts Of Anthropogenic Disturbances And Drought On Breeding Bird Abundance And Diversity In The Rolling Plains Ecoregion Of Texas, Natalie Ellen Hubbard Jan 2013

Impacts Of Anthropogenic Disturbances And Drought On Breeding Bird Abundance And Diversity In The Rolling Plains Ecoregion Of Texas, Natalie Ellen Hubbard

Biology Dissertations - Archive

Bird species, especially grassland species have undergone widespread decline in arid grasslands due to anthropogenic disturbance such as different land use including cattle grazing and agriculture and addition of physical structures such as buildings, roads and fences which can negatively impact both animals and native vegetation. The objective of this research was to determine the impacts of anthropogenic disturbance (i.e., presence of oil pump jacks and cattle grazing) and drought on breeding bird community dynamics in the Rolling Plains Ecoregion of Texas. The study involved four sites encompassing different land uses including a natural-non-cattle grazed, cattle-grazed, oil field pump jacks …

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Applications And Adaptations Of A Globally Convergent Numerical Method In Inverse Problems, Aubrey Rhoden Jan 2013

Applications And Adaptations Of A Globally Convergent Numerical Method In Inverse Problems, Aubrey Rhoden

Mathematics Dissertations - Archive

In our terminology "globally convergent numerical method" means a numerical method whose convergence to a good approximation of the correct solution is independent of the initial approximation in inverse problems. A numerical imaging algorithm has been proposed to solve a coecient inverse problem for an elliptic equation and then the algorithm is validated with the data generated by computer simulation. Previouswork in this eld was focused on the steady-state optical problem with multiple source positions moving along a straight line as well as the frequency domain problem with sweeping frequency. This work includes the steady-state thermal tomography problem with multiple …

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Timing Of Breastfeeding Initiation In Rural Haiti: A Focused Ethnography, Christy Bomer-Norton Jan 2013

Timing Of Breastfeeding Initiation In Rural Haiti: A Focused Ethnography, Christy Bomer-Norton

Nursing Dissertations - Archive

A focused ethnography aimed at describing the factors affecting the timing of breastfeeding initiation among Haitian mothers, particularly the specific cultural beliefs and practices was conducted in Artribonite, Haiti. A total of 25 Haitian mothers with children less than 12 months old participated in the study which included the use of interviews, observations and artifacts. A thick description was developed by integration of qualitative and quantitative data. Self-reported timing of breastfeeding initiation ranged from 10 minutes to 24 hours post birth among the 23 participants able to quantify the specific time of breastfeeding initiation. Birth attendants were identified as key …

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Integrating Primary Care Into Behavioral Health: Evaluating An Evidence-Based Referral Process In A Community Mental Health Facility, Marcia Harris Jan 2013

Integrating Primary Care Into Behavioral Health: Evaluating An Evidence-Based Referral Process In A Community Mental Health Facility, Marcia Harris

Doctor of Nursing Practice (DNP) Scholarly Projects - Archive

A collaboration to serve individuals with mental disorders and co-morbid physical health issues is vital to improving health care outcomes for the individual as a whole. Objective: This project sought to answer the following research questions: (a) Did the patients with mental illness attend referred appointments at the co-located primary health care clinic?; (b) If referred appointments at the primary health care clinic were missed, what were the most common reasons?; ( c) Did the primary care and mental health care prescribers at the colocated clinics report that the referral process was beneficial? Results: Throughout this 8 week project, there …

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Ruthenium(Ii) Polypyridyl Complexes As Potential Anticancer Drugs: Synthesis, Characterization, Cell Permeability And Localization, Yanling Chen Jan 2013

Ruthenium(Ii) Polypyridyl Complexes As Potential Anticancer Drugs: Synthesis, Characterization, Cell Permeability And Localization, Yanling Chen

Chemistry & Biochemistry Theses - Archive

Research on biological activities of ruthenium polypyridyl complexes (RPCs) continues to attract interest as these complexes have shown promising anticancer activity both in vitro and in vivo.¹⁻³ The mononuclear RPC, [(phen)₂Ru(tatpp)]²⁺ (MP) and related dinuclear complex [(phen)₂Ru(tatpp)Ru(phen)₂]⁴⁺ (P) have been shown to both intercalate with DNA and shown potentiated DNA cleavage under anaerobic and reducing conditions⁴⁻⁵, as well as shown good selectivity and cytotoxicity towards malignant cell lines in vitro and tumors in vivo.⁵ Both complexes contain the redox-active tatpp ligand which is thought to be an essential component for the observed biological activities. This thesis is focused on developing …

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Beliefs In Medications And Treatment Complexity As Predictors Of Medication Adherence Among Adults 18-65 Years Old With Inflammatory Bowel Disease, Donna Bacchus Jan 2013

Beliefs In Medications And Treatment Complexity As Predictors Of Medication Adherence Among Adults 18-65 Years Old With Inflammatory Bowel Disease, Donna Bacchus

Nursing Dissertations - Archive

Low adherence to medications in patients with inflammatory bowel disease (IBD) results in relapses and subsequently increased healthcare costs, poor quality of life, and increased comorbidities. In this correlational study, treatment complexity and beliefs in medications were tested to determine if they are predictors of medication adherence. Through convenience sampling, participants were recruited through face book, IBD organizations, and foundation websites (n = 369 final sample size). Females comprised the overwhelming majority (81.8%) of the sample. Using the Morisky Medication Adherence Scale, approximately 56% were classified as nonadherent and 44% as adherent. Beliefs in medications were measured by four subscales: …

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Nematodes With Three Genders: Models For The Evolution Of Mating Systems, Parasitism And Aging, Jyotiska Chaudhuri Jan 2013

Nematodes With Three Genders: Models For The Evolution Of Mating Systems, Parasitism And Aging, Jyotiska Chaudhuri

Biology Dissertations - Archive

All living organisms reproduce and age. These are the two basic facets of life, but in many aspects poorly understood. The majority of the species are male/female. The proportion of genders in population can vary significantly among animals and plants, but the mechanisms and evolutionary reasons for such variation are poorly understood. In some species of nematode (roundworm) parasites, for example, only female progeny is generated after a cross between a male and female. To understand how gender-ratio distortion happens and how it evolved, we are using a non-parasitic nematode that can be cultured in the laboratory, but that is …

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