Digital Commons Network^™

Vulnerabililty Analysis Of Multi-Factor Authentication Protocols, Keith Garrett

UNF Graduate Theses and Dissertations

In this thesis, the author hypothesizes that the use of computationally intensive mathematical operations in password authentication protocols can lead to security vulnerabilities in those protocols. In order to test this hypothesis: 1. A generalized algorithm for cryptanalysis was formulated to perform a clogging attack (a formof denial of service) on protocols that use computationally intensive modular exponentiation to guarantee security. 2. This technique was then applied to cryptanalyze four recent password authentication protocols, to determine their susceptibility to the clogging attack. The protocols analyzed in this thesis differ in their usage of factors (smart cards, memory drives, etc.) or …

Sulfate-Reducing Bacteria Community Analysis: Isco/Isb Coupled Remediation, Christopher K. Bartlett

Theses and Dissertations (Comprehensive)

Improved techniques for remediating groundwater systems are required for the more than 500,000 contaminated sites in North America. Many of these sites are the legacy of historical industrial operations, inappropriate disposal practices and accidental releases. The most widely observed contaminant at many of these sites is petroleum hydrocarbons (PHCs). Recently, remediation efforts that involve the sequential application of treatment technologies have gained widespread interest. One specific sequential technology application or treatment train employs the aggressive nature of a chemical oxidation followed by bioremediation for polishing. When persulfate is used as the chemical oxidant its natural degradation by-product is sulfate, an …

Potential Wave Impacts On Shorelines In Intertidal Waterways, Collin Ries

UNF Graduate Theses and Dissertations

Coastal erosion is caused by a deficit in the sediment balance along coastal shorelines. Within the intertidal waterway of Jacksonville, Florida, the primary processes acting on the shoreline are tidal currents and waves generated by winds and passing vessels. This study focuses on the analysis of vessel-generated waves and their possible effects on different shoreline types. The experiment conducted herein examines variations in turbidity related to passing boats at a specifically selected site location, at which different tidal stages expose three different shoreline types, a non-vegetated scarp, a vegetated scarp and a vegetated area with no scarp in the breaking …

Mate Choice And Consequences For Consanguineous Mating In Drosophila Melanogaster, Emily S. Martin

Theses and Dissertations (Comprehensive)

The ability to discriminate between prospective mates is potentially important not only for the avoidance of unsuccessful or incompatible matings, but also for the selection of higher “quality” mates. Inbreeding, reproduction between closely related individuals, has long enjoyed the attention of biologists, and has classically been associated with fitness consequences that are primarily negative, termed “inbreeding depression”. Indeed, the costs of mating with a relative are well documented across a wide variety of species. If individuals are capable of kin recognition, it is expected that species should evolve to avoid consanguineous matings. However, a number of recent models suggest circumstances …

Age-Related Changes In Hippocampal Arc Expression Following Minimal Behavioural Induction, Irina V. Odintsova

Theses and Dissertations (Comprehensive)

Normal ageing is associated with significant changes in cognitive function, including the decline of some forms of memory. The hippocampal formation is critical to learning and memory function, and plasticity in this region declines with age. Additionally, age-related differences in plasticity are greatest at lower levels of stimulation, thus peri-threshold plasticity may be of the greatest relevance for age-related changes in cognition. Moreover, the hippocampus is prone to changes in the expression of gene products that mediate plasticity with age. The current thesis attempts to link these observations by measuring hippocampal expression of Arc, an immediate-early gene that is critical …

The Effect Of Balanced Strategy Instruction On English Language Learner Literacy, Jacqueline R. Wettlaufer

Theses and Dissertations (Comprehensive)

English Language Learner (ELL) achievement on standardized testing in a second language (L2; English) has been shown to be compromised due to L2 literacy deficits demonstrated by many of these students (Cheng, Fox, & Zheng, 2007; Solorzano, 2008; Zheng, Cheng, & Klinger, 2007). ELL achievement results on the Ontario Secondary School Diploma (OSSD) literacy requirement, the Ontario Secondary School Literacy Test (OSSLT), have remained consistently a minimum of 10% below that of students whose first language (L1) is English (Education Quality and Accountability Office, 2015a). The focus of this quasi-experimental study was to improve …

An Exploratory Approach To Manipulating Dynamic Stability: Investigating The Role Of Visual Control During A Precision Foot Placement Task, Russell Cg Kennedy

Theses and Dissertations (Comprehensive)

ABSTRACT

Background: The visual system provides the body with an accurate sensory system; designed to gather information at a distance and acts as a feedforward control mechanism during human locomotion. By doing so, visual information contributes coordination of the head-arm-trunk (HAT) segment and modulating foot placement. The purpose of this study was to examine the effects of a constrained pathway during a complex navigational stone-stepping task on HAT segment control and how the visual system guides locomotion during a complex foot placement task.

Methods: Nine university-aged females (Mean age: 22.5 years old +/-1.75) participated in this study. Participants …

Factors Influencing Influenza Vaccination Rates Among Rural Ontario Paramedics, Tonya A. Leduc

Theses and Dissertations (Comprehensive)

Introduction. Influenza vaccination rates have traditionally been very low among healthcare workers (HCWs) however; very few studies have examined vaccination rates andmotivators among paramedics.

Objectives. The Health Belief Model (HBM) (Rosenstock,1974) was used as a guideline in this study to better understand the motivators and barriers to flu vaccination among rural Ontario paramedics. This group represents a considerable proportion of the HCW community, yet it has been virtually omitted from previous research.

Methods. Through the use of self-report questionnaires, and using the HBM as a guideline, a graphical representation of the decision-making process regarding flu vaccination was generated. The sample …

Partitioning Evapotranspiration In Forested Peatlands Within The Western Boreal Plain, Fort Mcmurray, Alberta, Canada, Elise C. Gabrielli

Theses and Dissertations (Comprehensive)

Forested peatlands in the Western Boreal Plain (WBP) represent hydrologically sensitive ecosystems that often support an open-crown forest of Picea mariana and/or Larix laricina. These systems store globally significant soil carbon, containing one-fourth to one-third of the world’s soil organic carbon pool (Turunen et al., 2002),serving a critical role in regulating atmospheric CO₂. Recent studies indicate that the hydrological conditions are the critical determinant of a peatland’s carbon budget (Price et al., 2005; Aurela et al., 2007).To understand current hydrological conditions, it is essential to accurately estimate the rate of ET, due …

Scalar Short-Term Memory, Tyler D. Bancroft

Theses and Dissertations (Comprehensive)

The location of the brain’s working and short-term memory (WM/STM) “system” is unclear. The existence of a dedicated WM/STM system is itself under debate. Recently, it has been proposed that WM/STM storage relies not on a dedicated system in prefrontal cortex, but rather that it is an emergent function of interaction between attentional and representational systems (e.g., sensory cortex) in the brain. However, mnemonic representations of very simple stimuli have repeatedly been shown to exist in frontal cortex. In this manuscript, I use computational and behavioural methods to demonstrate similarities between the representations of different types of very simple stimuli …

Let's Talk About (Consensual) Sex!, Eleanor M. Mcgrath

Theses and Dissertations (Comprehensive)

Legal, moral, and health-related issues around sexual consent have become prominent in the media in recent years. The public debate surrounding these news stories indicates a large discrepancy in people’s understanding of sexual consent and its legal implications. Motivated by the fact that university students are sexually victimized at rates exceeding the general population, this study explores factors that influence knowledge of legal aspects of sexual consent and confidence in using such knowledge of students/alumni, under 30 years old, from two southern Ontario universities. This quantitative study used an online survey design, and is grounded in a heuristic paradigm, with …

Professional Learning And Knowledge Transfer To Practice In Unregulated Care Provider Training In Resident-Centred Care, Sarah Pottier

Theses and Dissertations (Comprehensive)

Ongoing training for unregulated care providers (UCPs) in Ontario is required to meet the care needs of the aging population. Inconsistencies in standards and options for formal training for UCPs as well as the evolving complex needs of the aging population are factors contributing to needing training programs for UCPs in the workforce. This thesis examined the delivery and transfer of professional learning for UCP training in resident centred care. Increasing resident-centred care behaviours and knowledge were the primary aims of the training. One 128-bed long-term care home in southwestern Ontario volunteered to participate in this study while providing the …

Birth Pangs: Maternity, Medicine, And Feminine Delicacy In English Canada, 1867-1950, Whitney L. Wood

Theses and Dissertations (Comprehensive)

The pain women experience in giving birth is a universal, cross-cultural, biological reality. The ways women experienced these pains, as well as the ways they were perceived by physicians and depicted in wider medical discourses, however, are historically and culturally specific. In late nineteenth and early twentieth century English Canada – a key period in terms of both the medicalization of birth and the professionalization of obstetrics – the dominant medical perception of the female body held that white, middle-class, and urban-dwelling women were particularly “delicate” and sensitive to pain for a variety of reasons. Drawing on a broad range …

What Lies Past Remission: The Perceived Late Effects Of Pediatric Cancer, Monica L. Molinaro

Theses and Dissertations (Comprehensive)

Objective

Pediatric cancer survival rates are increasing (Childhood Cancer Canada Foundation, 2011) and with this, so are the late effects of pediatric cancer (Oeffinger et al., 2006). This research examines the lived experiences of the perceived long-term effects of pediatric cancer on adult survivors and their primary support persons in order to understand the multifaceted nature of the illness on adults, and how it affects others close to them.

Methods

The theoretical orientation used to guide the research was phenomenology in order to present an accurate depiction of all the participants’ lived experiences. Specifically, background questionnaires were administered and one-on-one …

The Feasibility, Practicality And Uses Of Detecting Crop Water Stress In Southern Ontario Apple Orchards With A Uas, Thomas S. Tiidus Mr.

Theses and Dissertations (Comprehensive)

UAS (Unmanned Aerial Systems) are becoming more common place in agricultural sites around the world. While the accuracy of achieving NDVI (Normalized Difference Vegetation Index) from a UAS is well understood, few studies have attempted to acquire other plant health attributes such as CWSI (Crop Water Stress Index), particularly in horticulture such as apple orchards. In addition, no academic studies up to the time of this writing have explored the perceived usefulness of data obtained from a UAS for the average farmer. This study explored the practicality and feasibility of using UAS for apple orchards in Southern Ontario. This study …

Japanese Encephalitis: Assessing Disease Risk Due To Landscape Factors At Multiple Scales, Julia E. Metelka

Theses and Dissertations (Comprehensive)

Japanese Encephalitis is a mosquito-borne disease and is the leading cause of viral encephalitis in Asia. In many Asian countries, the geographical distribution of JE is dependent on a variety of human-environment interactions that can be conceptualized as a complex social-ecological system. The JE transmission cycle is influenced by a few primary human-landscape factors; the abundance and the spatial configuration of rice paddy fields (which provide habitat for the vector), the distribution of pig farms (which position the virus' amplifying host), and the location of a susceptible human population. Our models integrate population dynamics, landscape characteristics, and weather variables that …

Moral Identity From Cross- And Bi-Cultural Perspectives, Fanli Jia

Theses and Dissertations (Comprehensive)

Researchers in moral psychology have initiated projects to investigate moral identity; however, they agreed that a precise definition and methodology of moral identity has been lacking in establishing the value of this new area. One of the challenges is that cultural explorations of moral identity are absent. Moral identity may take different forms in different cultures, or play an important role in morality in some cultures but not in others (Hardy & Carlo, 2005). The present dissertation was aimed at investigating how Western Canadian and Eastern Chinese cultural orientations relate to moral identities. Three studies were conducted.

In the first …

Evaluating A Skills-Based Approach To Bullying Prevention, Rebecca Pister

Theses and Dissertations (Comprehensive)

In the following paper, I present an evaluation of the bullying prevention program designed and delivered by the John Howard Society of Waterloo-Wellington (JHS WW). A mixed-methods approach involving both quantitative and qualitative data collection was used to assess the program impacts on children receiving the primary stream of the program (Pre-Kindergarten through Grade 3), and the junior stream of the program (Grades 4 through 6). A case study was also conducted to assess the impacts of the program one year after program delivery and after two consecutive years of programming. Finally, all school staff members were invited to respond …

Examining Quality Indicator Rates For Older Home Care Clients With Dual Sensory Impairment (Dsi) And Exploring The Heterogeneity Within Dsi., Jacob G S Davidson, Dawn M. Guthrie

Theses and Dissertations (Comprehensive)

Older adults with impairments in both hearing and vision, called dual sensory impairment (DSI), are at an increased risk of negative health outcomes such as impaired communication and difficulties with mobility. It is unknown whether DSI is associated with potential quality of care issues. This study used a set of home care quality indicators (HCQIs) to examine potential quality issues in older clients (65+) with DSI. Further, it looked to explore how HCQI rates differed based on the geographic region of care and whether the client’s level of hearing and vision impairment was related to certain HCQIs. The HCQIs were …

An Examination Of Newcomer Integration Processes In Sport Teams: A Socialization Perspective, Alex J. Benson

Theses and Dissertations (Comprehensive)

In highly interdependent groups, the ability to swiftly and successfully integrate newcomers is an important component to maintaining functional team dynamics. The current dissertation explored how sport teams structure the nature and timing of events that newcomers are put through by implementing specific socialization tactics. In the first manuscript, a qualitative study was initiated to garner descriptive insights into the tactics that are used to socialize athletes into sport teams. Semi-structured interviews were conducted with coaches, veteran athletes, and newcomer athletes (i.e., individuals in their first year as a team member). Participant insights were thematically analyzed and compared to existing …

The Kinetic Characterization Of Two Putative Galactosidases, Bt2857 And Sco6594, And The Preliminary Analyses Of Sco6595-97, Maria Ngo

Theses and Dissertations (Comprehensive)

Bacteroides thetaiotaomicron is a prolific bacterium found in the distal intestinal tract of humans that possesses the ability to breakdown complex polysaccharides through the release of carbohydrate-active enzymes (CAZymes). Overall, the saccharolytic prowess of B. thetaiotaomicron presents an intriguing model for understanding microbial-host nutrient exchange within the gut and to identify novel mechanisms for accessing carbohydrates. The successful expression, purification, and preliminary kinetic characterization of BT2857 are reported. BT2857 was found to be enzymatically active against the artificial substrate, 4-nitrophenyl β-D-galactopyranoside (pNP-Gal); suggesting its role as a putative β-galactosidase and allowed for the quantification of BT2857 activity by the determination …

Leadership Practice, Organizational Culture And New Managerialism: Strengths, Challenges, Variations And Contradictions In Three Children's Service Agencies, Rosemary E. Vito

Theses and Dissertations (Comprehensive)

Abstract

The purpose of this research study was to explore how social work leaders conceptualized and practiced leadership and how their leadership practice influenced, and was shaped by, organizational culture. The relevance and viability of a participatory leadership approach and a collaborative learning culture were also explored. As well, leadership satisfaction and development and the impact of external changes were sought. A qualitative research approach, multiple case study and multi-method design were employed. Forty-one directors and supervisors in three children’s mental health and child welfare agencies in Ontario participated in this study. Research methods included interviews, focus groups, observations and …

Comparing The Regio- And Enantioselectivity Of Inverting Versus Retaining Epoxide Hydrolases, Mark A. Aliwalas

Theses and Dissertations (Comprehensive)

Epoxide hydrolases (EHs) are enzymes that catalyze the ring opening of an epoxide, yielding a vicinal diol. This exciting class of enzymes is often associated with natural product and small molecule biosynthesis. One interesting class of natural products that epoxide hydrolases are involved in the biosynthesis of is the enediynes. Previously, 5 enediyne-associated epoxide hydrolases have been characterized, revealing an inverting-versus-retaining paradigm for enediyne epoxide hydrolases. The work described herein sets the table for future studies involving the probing of the α/β-epoxide hydrolase mechanism for styrene oxide. Kinetic and regioselectivity characterization of the enediyne-associated CynF and SghF has determined that …

Strange Compositions: Chemistry And Its Occult History In Victorian Speculative Fiction, Susan Hroncek

Theses and Dissertations (Comprehensive)

This dissertation examines how depictions of chemistry in Victorian literature are influenced by concerns regarding the history of chemistry and its relationship to the occult. Among these depictions, I consider non-fiction writings of the period, such as histories of science and articles from periodicals, but I focus on novels that prominently feature chemistry, including Edward Bulwer-Lytton’s A Strange Story (1862), Robert Louis Stevenson’s Strange Case of Dr. Jekyll and Mr. Hyde (1886), George Griffith’s Olga Romanoff (1894), T. Mullet Ellis’s Zalma (1895), and Richard Marsh’s The Beetle (1897). These texts link chemistry with its origins in alchemy, the occult, and …

Social Problems, Biomedical Answers? How Causes Of Social Problems Affect Choice Of Solutions, Bianca C. Dreyer

Theses and Dissertations (Comprehensive)

With rapid advances in behavioural genetics, scientists are identifying an increasing array of genetic influences on human behaviour. Public misconceptions about the function of genes often lead to the oversimplification of the role of genes in behaviour (Dar-Nimrod & Heine, 2011). To date, no study has systematically investigated whether simply learning about genetic causes of behaviour affects people’s preferred solutions to problematic behaviours. The present research program includes three studies that were designed to examine the psychological effects of exposure to genetic etiology for problematic behaviour, in particular aggression, and investigated how this information influences endorsement of solutions, rating of …

The Effects Of Manipulated Somatosensory Input On Simulated Falls During Walking, Sarah Mitchell-Ewart

Theses and Dissertations (Comprehensive)

Previous research has demonstrated that there is a distinct relationship between aging and instability. The somatosensory system plays a significant role in balance control in conjunction with vision and the vestibular system (Qiu et al., 2012). Evidence has shown that manipulation of the mechanoreceptors on the plantar surface of the foot has a direct effect on balance control. By manipulating these receptors with hypothermic anesthesia and vibration, researchers are capable of simulating the effect of sensory modification on healthy individuals, in order to understand the role that plantar-surface sensation has in adapting to perturbation during gait (Perry et al., 2001; …

Hiv Testing In The Context Of Hiv Stigma And Minority Stress, Mallory C. Harrigan

Theses and Dissertations (Comprehensive)

The HIV test is highly valued for its role in promoting personal health, aiding in HIV prevention, and enabling the epidemiological tracking of the virus. However, relatively few scholars have critically examined the social and cultural implications of testing practices (Scott, 2003). These implications are of particular concern because the groups targeted for testing (referred to as service priority groups) are marginalized communities, and have historically been further marginalized by many public health HIV prevention efforts (Waldby, 1996). This thesis examines the experience of receiving an HIV test from the perspective of individuals in service priority groups, which include gay, …

"Death Knows But One Rule Of Arithmetic": Discourses Of Death And Grief In The Trenches, Brittany C. Dunn

Theses and Dissertations (Comprehensive)

Death was ubiquitous in the First World War and while contemporaries acknowledged this, soldiers’ experiences of death and grief have been largely ignored in the Canadian historiography. This thesis seeks to address this gap in the literature by examining how English-Canadian soldiers responded to and coped with death on the Western Front. It argues that combatants developed and adapted multiple methods of coping, which ranged from humour to emphasizing ideals of sacrifice to emotional distance, in response to the horrific conditions of the trenches. This thesis explores both private and public discourses of death using contemporary diaries, letters and trench …

The 2d:4d Ratio, Handedness, And Sex Across The Age Span, Helen A M Protopapas Ms.

Theses and Dissertations (Comprehensive)

The ratio of the difference between the 2nd and 4th digits of the hand (2D:4D ratio) has been demonstrated to be an indirect indicator of prenatal testosterone levels. Prenatal testosterone has been found to play a role in brain development in utero, and thus may influence lateral asymmetries, such as handedness. Consequently, one of the aims of the current study was to examine relationships between the 2D:4D ratio, hand preference, and hand performance with the factors of sex (males and females), handedness (right handers and left handers), and age considered. A total of 104 participants were tested, 90 right handers …

Acculturation And Post-Immigration Changes In Obesity, Physical Activity, And Nutrition: Comparing Hispanics And Asians In The Waterloo Region, Ontario, Canada., Michele Vitale Mr., Sean Doherty

Theses and Dissertations (Comprehensive)

OBJECTIVES: The acculturation hypothesis speculates that as new immigrants get exposed to more obesogenic environments, they progressively acquire the unhealthy lifestyles of the host society, and their obesity risk gradually increases since time of arrival. However, the consistency of the presumed acculturation effect across immigrant groups and gender, and the reasons behind individual changes in lifestyle behaviors remain unclear. Thus, this study investigated the acculturation hypothesis in the Canadian context by comparing two foreign groups, Hispanics and East/Southeast Asians, which present contrasting post-settlement obesity patterns and behavioral trends.

Methods: A 41-item questionnaire (including open-ended questions) was administered with 100 first-generation …