Digital Commons Network^™

Mitigating The Shortcomings Of Language Models: Strategies For Handling Memorization & Adversarial Attacks, Aly Kassem

Electronic Theses and Dissertations

Deep learning models have recently achieved remarkable progress in Natural Language Processing (NLP), specifically in classification, question-answering, and machine translation. However, NLP models face challenges related to security and privacy. Security-wise, even small perturbations in the input can significantly impact a model's prediction. This highlights the importance of generating natural adversarial attacks to analyze the weaknesses of NLP models and bolster their robustness through adversarial training (AT). Conversely, Large Language Models (LLMs) are trained on vast amounts of data, which may include sensitive information. If exposed, this poses a risk to personal privacy. LLMs can memorize portions of their training …

Advanced Deep Learning Multivariate Multi-Time Series Framework For A Novel Covid-19 Dataset, Swastik Bagga

Electronic Theses and Dissertations

This thesis introduces an innovative framework aimed at addressing the complexities of predicting outcomes in multivariate multi time series datasets in regression analysis. By applying this framework to a novel COVID-19 dataset, it enhances predictive analytics by providing accurate forecasts for epidemic trends at regional or provincial levels, going beyond national-level analysis. The framework incorporates advanced data preprocessing, feature selection, engineering, encoding, and model architecture, effectively capturing intricate variable interactions and temporal dependencies. This makes it a powerful tool for tackling multivariate multi time series regression challenges, offering valuable insights for informed decision-making. Predicting outcomes in such datasets is challenging …

Influence Of Landscape And Nutrients On Stable Isotope Dynamics And Food Webs In A River Prior To Re-Establishing Fish Migration, Selina Al-Nazzal

Electronic Theses and Dissertations

Great Lakes tributaries are undergoing major ecosystem restoration through dam removal aimed at improving habitat connectivity. Re-establishing connectivity can have consequences for both desirable and undesirable species, especially in watersheds that risk the invasion of non-native species. To predict and evaluate the effects of reconnecting native fish habitats, I used stable isotopes of carbon (δ13C), nitrogen (δ15N), and sulphur (δ34S), spatial stream network (SSN) models and trophic niche measurements to examine the influence of land cover and nutrient concentration on the trophic ecology and distribution of stable isotopes of biofilm, macroinvertebrates, and fishes in the Boardman/Ottaway River (BOR), a tributary …

Robust Visual Observer And Controller Design For System Modeled On Se(3) With Camera Measurements, Tong Zhang

Electronic Theses and Dissertations

This dissertation presents a controlling method that utilizes visual observation to address the challenge of driving an autonomous vehicle with a kinematic model on SE(3), by using the data obtained from the onboard cameras. This controlling framework is applicable when direct retrieval of the vehicle's attitude information is not possible or when precision control of the vehicle is necessary. However, addressing several challenges to attain closed-loop stability for the observer-based control for autonomous vehicles on SE(3) is essential. 1. The analysis is further complicated by the presence of multiple equilibria in the error dynamics associated with the suggested method. 2. …

Politically Speaking: Participation Of Indigenous Women In Canada And The Importance Of Intersectionality And Indigenous Resurgence, Renee Grozelle

Electronic Theses and Dissertations

In the current political climate, the efforts of Indigenous women in the advancement of Indigenous rights have not gone unnoticed. Particularly, in 2012 the Idle No More movement gained attention across Canada and throughout the world, with Indigenous women front and centre, leading the fight against the destruction of land and working towards advancing the rights of Indigenous peoples. Importantly, the ways in which Indigenous women engage politically has continued to evolve and there is a need to document and understand the changes that are occurring. This research seeks to examine the changes in political participation among Indigenous women by …

Root System Response Of Soybean To Microplastics Of Varying Types And Concentrations, Deqa Farow

Electronic Theses and Dissertations

Biosolid fertilizer use causes the input of microplastics into the rhizosphere where they may interfere with root interactions with the soil and microbial community and thereby hinder plant acquisition of nutrients and water. However, it is unclear what microplastic concentration or types affect plant root system and when these impacts manifest. Using the rhizobox method, soybeans were grown in soil was dosed with microplastic mimics (PET sheets and PP beads at 2,000 and 15,000 particles / kg dry soil) and biosolids. A time-series analysis was conducted on plant root traits using non-destructive imaging with an Epson 12000xl scanner of the …

Politics Of Resistance: On Muslim Women Advancing A Collective Critical Faith-Based Epistemic, Ayesha Mian Akram

Electronic Theses and Dissertations

Hegemonic anti-Muslim rhetoric, entangled with global structures of white supremacy, imperialism, and colonialism, constructs Islam as culturally and civilizationally critical to the instability of supposedly peaceful secular western societies. Muslim women’s bodies, specifically, become sites where the Muslim is socio-politically constructed as Other, disconnected from her religiosity and constituted as a racialized Other. This dissertation contributes to the nuanced and intersectional body of scholarship examining the complexities of the Muslim experience in Canada today by analyzing the creation and power of a group of Muslim women engaged in impactful resistances as they seek to create change within and for their …

The Association Of Perceived Stress With Anxiety-Related Symptoms During Use Of The Mindshift App, Emily Jerome

Electronic Theses and Dissertations

Background: Despite their potential to increase public accessibility for mental health resources, little prior research evaluated factors that may moderate the utility of e-mental health interventions. Research to identify moderators of e- mental health response would guide the development of interventions to meet the needs of presently underserved populations. Objective: The present study extended a North American open label trial of a smartphone-based mental health app (MindShift, Anxiety Canada) designed by psychologists and psychiatrists to increase public accessibility to evidence-based anxiety resources. Specifically, this study examined the role of perceived self- efficacy and helplessness to moderate individuals’ response to use …

An Exploration Of Encounters Between People With Lived Experience Of Mental Illness And Police Officers, Sarah Faubert

Electronic Theses and Dissertations

Understanding the ways police officers and people with lived experience of mental illness interact during mental health calls is imperative to improving the outcomes of these encounters. Despite increased attention and public calls for change, little is known about the complex ways police officers and people with mental illness interact during a mental health crisis. To address the paucity of literature, this study sought answers to critical and under-explored areas to better understand the context and characteristics of these interactions. The overarching research question for this study was: How do people with mental illness and police officers experience interacting with …

Memristor-Based Digital Circuit Design, Khalid Mohammed Alammari

Electronic Theses and Dissertations

Further miniaturization in CMOS technology has faced severe challenges, such as increased leakage power and reduced circuit reliability, which has caused fundamental restrictions on advancing efficient computing architecture. These problems can be addressed by the new emerging devices known as memristors owing to their nanoscale size and the ability to integrate with the exciting CMOS technology. Memristors are passive devices with variable resistance. The resistance value will remain constant when no electrical field is applied, giving this device a unique behavior by saving its last state. This unique behavior makes this device very appealing to a wide variety of applications …

The Role Of Self-Talk In Regulating Public Speaking Anxiety In Ethnically Diverse Young Adults In Canada, Clare Denise Russell Hinch

Electronic Theses and Dissertations

Public speaking is a commonly required skill within academic and workplace settings, and the ability to confidently and effectively communicate orally in group contexts is highly valued. However, public speaking is uncomfortable for many individuals, often associated with behavioural, cognitive, and physiological manifestations of anxiety. This discomfort may be even greater in individuals who are required to speak in a language in which they do not feel adequately proficient. Given the importance of oral communication skills within academic, workplace, and community settings, it is imperative that individuals are able to effectively regulate this anxiety response. One way in which an …

A Taste Of Tradition: Exploring Geographical Indications And Indigenous Agricultural Knowledge In Canada, Rashveen Chawla

Electronic Theses and Dissertations

This thesis offers a critical analysis of the use of geographical indications (GIs) to protect food and agricultural traditional knowledge products, with a focus on Canada. The aim of this research is to contextualize questions on the use of GIs within the general framework of international and national regimes governing intellectual property rights, traditional knowledge and agriculture. It also examines the relationship between geographical indications and development in Canada's intellectual property landscape. While the analysis presented in this dissertation is specific to Canada, the insights gained from this research may be relevant to other jurisdictions considering the use of geographical …

The Impact Of Cognitive Reserve On Baseline Neuropsychological Functioning Of Older Adults Without Dementia, Jarod Joshi

Electronic Theses and Dissertations

Background: For decades, a key question that has been posed by the cognitive aging literature is how do we preserve our cognitive abilities throughout the lifespan? This thesis examined the influence of cognitive reserve (CR) on different domains of cognitive functioning in a sample of older adults with varying levels of cognitive functioning, ranging from normal cognitive aging to mild cognitive impairment. To date, little research has used latent variable modelling to examine the potential relationships between cognitive reserve and cognition in older adults without dementia. Objectives: To examine the (1) cumulative and (2) independent effects of three well-established proxies …

Skin Cancer Detection By Deep Learning Algorithms, Faezeh Mohammadi Aydoghmishi

Electronic Theses and Dissertations

Skin cancer, characterized by the abnormal growth of skin cells, is a globally prevalent and serious condition. Despite advancements in digital diagnosis techniques, many existing skin cancer detection methods often fail to achieve satisfactory accuracy levels. In our first study, we propose a novel superpixel-based segmentation method that significantly surpasses the traditional k-means clustering in performance. After segmentation, we utilize Convolutional Neural Networks such as VGG16, ResNet50, DenseNet, Xception, Inception, and Mobilenet for feature extraction and classification. We also conducted a comparative analysis with other existing techniques. Our results suggest that our superpixel-based segmentation method notably enhances the accuracy of …

Characterizing Predator-Prey Relationships Of Great Lakes Fishes Using Targeted Stomach Content Dna Analyses, Matthew Richard Charron

Electronic Theses and Dissertations

Stomach content DNA (scDNA) analyses provide important insights into feeding ecology, trophic interactions, and diet composition of predator fishes. However, previous scDNA analyses have focused on investigating a small number of predator and prey fishes using binary presence/absence data. Here, I describe the development and validation of a panel of single-species quantitative real-time PCR (qRT-PCR) assays targeting the polymorphic mitochondrial cytochrome oxidase subunit 1 (CO1) region of 28 Great Lakes prey fishes. The assay panel will significantly increase the number of targeted prey species available for predator diet assessment, while at the same time improving detection sensitivity and through-put. I …

Exploring Paper As A Substrate For Printed Electronics, Lauren Jessica Renaud

Electronic Theses and Dissertations

With the Internet of Things (IoT) rapid expansion the use of printed electronics that can be easily integrated into everyday life is gaining traction. These devices often use plastics as a substrate due to their flexibility; however, they are not biodegradable and contribute to our growing electronic waste (e-waste) problem. A greener alternative that is sought after is paper. Paper is biodegradable, flexible, and already familiar to many printing processes. Though paper appears smooth its surface is rough due to being composed of cellulose fibers which create pores. In the printed electronics (PE) industry, these pores are typically seen as …

Geo-Location Informed Team Formation Using Gnn, Karan Saxena

Electronic Theses and Dissertations

Establishing a competent team is crucial to the success of a project and is influenced by skill distribution and geographic proximity. A team not only benefits from the shared knowledge amongst the team members derived from geographic closeness but also affects the outcome of the project the team is assigned to perform. A team benefits by sharing resources among each member, collaborating efficiently on a given task, brainstorming on an idea more effectively and saving time and money for both the team members and the organization. This thesis uses a neural-based multi-label classifier after a spatial team formation that uses …

The Effects Of Biosolid Microplastics On The Microbial Community And Root Functioning In The Rhizosphere Of Soybean Crops In Agricultural Soil, Rebecca Chloe Lebel

Electronic Theses and Dissertations

Biosolids are semi-solid by-products from wastewater treatment plants where contaminants such as microplastics can accumulate, and transfer into the root zone causing ecotoxic effects to the rhizosphere microbial community. Furthermore, microplastics can alter soil properties which have a strong control on the size and diversity of the rhizosphere microbial community and its ability to consume root-borne carbon compounds. Using the MicroRESP system the respiration of the rhizosphere microbial community of soybeans subjected to microplastic biosolid mimics of two types (PET sheets and PPT beads) and two concentrations (2,000 vs 15,000 particles/kg dry soil) was quantified. Baseline respiration rates from extracted …

Emergency Department Registered Nurses’ Perceptions Of Substance Use Disorders And Supervised Consumption Sites, Aleksandra Ilievska

Electronic Theses and Dissertations

Background: Canada is facing increased drug-related harms; thus, a stronger emphasis has been placed on harm reduction strategies such as supervised consumption sites (SCSs). There is a lack of literature on emergency department (ED) registered nurses’ (RNs) perceptions of SCSs and substance use disorders (SUDs), especially in small to mid-sized Canadian cities. Purpose: This study aimed to determine ED RNs’ perceptions of SUDs and SCSs in Southwestern Ontario hospitals. Methods: A 27-question survey was sent to RNs currently working in EDs in Southwestern Ontario using an online Qualtrics® link. The research explored ED RNs’ perception of SCSs and SUDs. Results: …

Predictive Validity Of Cu Traits On Conduct Disorder-Related Antisocial Behaviors In Canadian Adolescents: Advancing Understandings Relevant To The Dsm-5 Specifier With Limited Prosocial Emotions, Derek Campbell

Electronic Theses and Dissertations

The cross-sectional study employed logistic regression models to test hypotheses and explore the relationships between callous unemotional (CU) traits and antisocial behavioral outcomes among a sample of Canadian youth. Four main predictive associations were hypothesized, suggesting significant direct links between CU traits and antisocial behaviors. Specifically, it was hypothesized that four CU traits, namely, thinking school is unimportant, having a lack of sympathy, failure to comfort distressed children, and engaging in cruel behaviors would serve as strong predictors of antisocial behaviors. Furthermore, the study sought to assess the predictive validity of additional participant characteristics, including age, gender, socioeconomic status (SES), …

Anisotropic Mechanical Material Investigation On Moisture And Strain Rate Sensitivity Of Direct Compounded Compression Moulded Glass/Pa6 Lfts, Pouya Mohammadkhani

Electronic Theses and Dissertations

In this study the tensile properties at different loading rates as well as shear properties of a direct-compounded compression-moulded Polyamide6 (PA6)/glass long fibre thermoplastic (LFT-D) material with a fibre weight content of 30% were investigated. The effects of moisture on the anisotropic mechanical and material properties of Glass/PA6 LFT materials were examined by testing at four different material directions of 0°, +45°, ˗45°, and 90°. In order to study the effect of tensile loading rate on this material, different nominal strain rates ranging from 0.0001 1/s to 150 1/s were examined. Under quasi-static loading, at a 2% moisture content, the …

The Influence Of Spatiotemporal Variation In Food Web Models, Cecilia E. Heuvel

Electronic Theses and Dissertations

Aquatic ecosystems are constantly adapting to fluxes in season, temperature, nutrient cycling, and prey availability. Consequently, aquatic food webs are dynamic, and relationships between species are perpetually changing as organisms and primary producer communities adapt to current environmental conditions both in time and space. Despite this knowledge however, many food web studies continue to use temporally static and spatially homogenous representations of food webs. This thesis proposes that a detailed investigation of temporal and spatial trends in a large lake ecosystem can improve our understanding of the mechanisms and drivers of spatial and temporal variation in food web structure and …

Matches Made In Heaven Or Somewhere: Personalized Query Refinement Gold Standard Generation Using Transformers, Yogeswar Lakshmi Narayanan

Electronic Theses and Dissertations

The foremost means of information retrieval, search engines, have difficulty searching into knowledge repositories, e.g., the web, because they are not tailored to the users' differing information needs. User queries are, more often than not, under-specified or contain ambiguous terms that also retrieve irrelevant documents. Query refinement is the process of transforming users' queries into new refined versions without semantic drift to enhance the relevance of search results. Prior query refiners have been benchmarked on ad-hoc web retrieval datasets following weak assumptions that users' input queries improve gradually within a search session. Existing methods also have employed additional metadata, such …

Enhancing Breast Cancer Detection Through Combination Of Contrastive Learning And Adversarial Domain Adaptation, Mahnoosh Torabi

Electronic Theses and Dissertations

The most common cancer diagnosed worldwide is breast cancer and early detection is essential for reducing mortality. The best standard for early detection of breast cancer is digital mammography, which can aid physicians in treating the illness when it is still curable. However, inaccurate mammography diagnoses are frequent and can cause patients to undergo unnecessary examinations and therapies. This study aims to explore deep-learning techniques that can be utilized to implement and train a model to identify breast cancer cases in mammograms. Current deep learning-based diagnostic techniques are hindered by two fundamental issues: the expensive and time-consuming task of data …

Painting The ‘Essential’ Green Activist: Critical Interrogations Of Responses To Environmental Activism, Alex Jack Painter

Electronic Theses and Dissertations

In this paper, qualitative Directed Content Analysis is used to elucidate and analyze media rhetoric and legal rhetoric found in prominent news publications reporting on green protests in Canada and the United States. Preliminary theory suggested commodification of the environment encourages the denigration of green dissenters and may aim to lead to negative conceptualizations of the ‘green activist’ in the public consciousness. Further content analysis notions that the political leanings of given news publications may be the strongest predictor of the level of support/opposition to green protest that an article will purvey. And, animal advocacy, youth-led dissent, protest around critical …

Inference In Generalized Mean Reverting Processes, Yunhong Lyu

Electronic Theses and Dissertations

This dissertation proposes three types of processes that are suitable for modeling positive datasets with periodic behavior and mean-reverting level phenomenon. A class of generalized exponential Ornstein–Uhlenbeck process (GEOU) is consid- ered in Chapter 2. This chapter’s key characteristics include the following: first, the classical exponential Ornstein–Uhlenbeck process is generalized to the case where the drift coefficient is driven by a period function of time; second, as opposed to the results in recent literature, the dimension of the drift parameter is considered unknown. This chapter serves to weaken some assumptions, in recent literature, underlying the asymp- totic optimality of some …

Deconstructing Caste-Based Private Discrimination: Comparative Examination Of India And Canada, Shubham Kumar

Electronic Theses and Dissertations

"Caste" is a rigid system of social hierarchy marked by deep-rooted divisions. These divisions are upheld through patriarchal and heteronormative practices, often enforced through the looming threats of social ostracism, economic boycotts, and physical violence, which also infringe upon the rights guaranteed by the Constitution of India. While numerous legal judgments and legislations have concentrated on mitigating caste-based discrimination by state authorities and individuals in public spaces, significantly less attention has been directed towards caste discrimination in private spheres, referred to as private discrimination. Despite explicit constitutional provisions that prohibit private discrimination and enable individuals to take legal action against …

“Volunteers Are Our Bloodline”: Examining Managerial Perceptions Of The Relationship Between Volunteer Behaviour And Event Performance, Emily Stadder

Electronic Theses and Dissertations

Sport organizations and events rely heavily on volunteers to achieve their goals and missions. Currently, volunteer research is heavily focused on the experiences of individual volunteers and the management of volunteers in continuous positions. This research takes a different approach by examining managerial perceptions of the relationship between volunteer behaviour and event performance at Canadian national amateur sport championships. Drawn from the field of strategic human resource management, behavioural perspective theory was used to understand if volunteer managers are linking strategy to their human resource management (HRM) systems, what desired role behaviours they are expecting from volunteers, what HRM systems …

Physiological And Behavioural Responses Of Arctic-Breeding Shorebirds To Weather And Habitat Conditions, Sara Bellefontaine

Electronic Theses and Dissertations

Arctic-breeding shorebirds balance proximate and ultimate trade-offs in an energetically demanding environment. While these species are selective of nest sites, previous research shows that the characteristics of preferred shorebird nests do not predict increased breeding success. Thus, I aimed to identify detectable mechanisms driving nest preferences in Arctic-breeding shorebirds. Using an archival dataset, I first examined long-term nest preferences in relation to wind conditions at the East Bay Migratory Bird Sanctuary, on Southampton Island, Nunavut, Canada. I then studied energetic responses of two shorebird species to weather conditions across various nest types in a field study using non-invasive heart rate …

Emergency Department Registered Nurses’ Perceptions Of Substance Use Disorders And Supervised Consumption Sites, Aleksandra Ilievska

Electronic Theses and Dissertations

Background: Canada is facing increased drug-related harms; thus, a stronger emphasis has been placed on harm reduction strategies such as supervised consumption sites (SCSs). There is a lack of literature on emergency department (ED) registered nurses’ (RNs) perceptions of SCSs and substance use disorders (SUDs), especially in small to mid-sized Canadian cities.

Purpose: This study aimed to determine ED RNs’ perceptions of SUDs and SCSs in Southwestern Ontario hospitals.

Methods: A 27-question survey was sent to RNs currently working in EDs in Southwestern Ontario using an online Qualtrics® link. The research explored ED RNs’ perception of SCSs and SUDs.

Results: …