Social and Behavioral Sciences Commons^™

Examining Mobile Health App Engagement In A North American Employee Population: A One-Year Longitudinal Observational Study, Nabil Ratanshi

Electronic Thesis and Dissertation Repository

BACKGROUND: Mobile health (mHealth) apps may help promote physical activity and other health behaviours among office-based workers. Low app engagement, however, leading to little or no effect is typical. OBJECTIVE: To examine engagement with a rewards-based mHealth app and identify factors influencing engagement. METHODS: A one-year observational study was conducted with Canadian and U.S. users of the Sprout at Work app (N=2253; Female: 35.7%; Age: 39.3 years). Kaplan-Meier survival curves were used to examine engagement patterns from a ‘multiple-lives’ perspective (i.e., time to first disengagement, re-engagement, second disengagement). Regression models were used to identify factors influencing engagement. RESULTS: After one …

The General Artificial Intellect, Ramon S. Diab

Electronic Thesis and Dissertation Repository

In passages of Marx’s Grundrisse known as the Fragment on Machines, Marx suggested that advanced capitalist development leads to the production of autonomous machines that replace labour-power in the direct production process. Autonomist Marxist interpretations of this text have emphasized that the proliferation of immaterial labour is the historical condition that is leading to a crisis in the measure of value based on labour-time and that will lead to a future communist mode of production. Further, Mario Tronti posited that as capitalist development unfolds, it subsumes both the state and society, a concept known as the ‘social factory thesis’. …

A Visual Analytics System For Making Sense Of Real-Time Twitter Streams, Amir Haghighatimaleki

Electronic Thesis and Dissertation Repository

Through social media platforms, massive amounts of data are being produced. Twitter, as one such platform, enables users to post “tweets” on an unprecedented scale. Once analyzed by machine learning (ML) techniques and in aggregate, Twitter data can be an invaluable resource for gaining insight. However, when applied to real-time data streams, due to covariate shifts in the data (i.e., changes in the distributions of the inputs of ML algorithms), existing ML approaches result in different types of biases and provide uncertain outputs. This thesis describes a visual analytics system (i.e., a tool that combines data visualization, human-data interaction, and …

In Search Of Psychiatric Kinds: Natural Kinds And Natural Classification In Psychiatry, Nicholas Slothouber

Electronic Thesis and Dissertation Repository

In recent years both philosophers and scientists have asked whether or not our current kinds of mental disorder—e.g., schizophrenia, depression, bipolar disorder—are natural kinds; and, moreover, whether or not the search for natural kinds of mental disorder is a realistic desideratum for psychiatry. In this dissertation I clarify the sense in which a kind can be said to be “natural” or “real” and argue that, despite a few notable exceptions, kinds of mental disorder cannot be considered natural kinds. Furthermore, I contend that psychopathological phenomena do not cluster together into kinds in the way that paradigmatic natural kinds (e.g., chemical …

Cultivating Knowledge: Agrarian Science And Ecological Engagements In Southern Ontario Agriculture, Kelly Linton

Electronic Thesis and Dissertation Repository

Agriculture and climate change are interconnected processes, with agriculture implicated in rising green house gas emissions, deforestation, soil and water pollution, and reductions in biodiversity. Conversely, changes within ecology (including a warming climate), alter growing conditions for farmers. Farmers face changes in both temperature and precipitation, as well as an increase in adverse weather events that significantly threaten productivity and livelihoods.

Based on 40 unstructured interviews as well as informal conversations conducted among farmers in southern Ontario, Canada between the spring of 2014 and the winter of 2017, this dissertation seeks to contribute to a growing body of work that …

A Pluralism Worth Having: Feyerabend's Well-Ordered Science, Jamie Shaw

Electronic Thesis and Dissertation Repository

The goal of this dissertation is to reconstruct, critically evaluate, and apply the pluralism of Paul Feyerabend. I conclude by suggesting future points of contact between Feyerabend’s pluralism and topics of interest in contemporary philosophy of science. I begin, in Chapter 1, by reconstructing Feyerabend’s critical philosophy. I show how his published works from 1948 until 1970 show a remarkably consistent argumentative strategy which becomes more refined and general as Feyerabend’s thought matures. Specifically, I argue that Feyerabend develops a persuasive case against rationalism, or the thesis that there exist normative and exclusive rules of scientific rationality. In Chapter …

Brassinosteroid-Mediated Stress Tolerance In Arabidopsis Thaliana, Tawhidur Rahman

Electronic Thesis and Dissertation Repository

Brassinosteroids (BRs) are a group of steroidal plant hormones that are essential for proper plant development and also promote stress tolerance. Without BRs, plants are dwarfs and infertile. To understand the molecular mechanisms underlying BR-mediated stress tolerance, global gene expression analysis of untreated and 24-epibrassinolide (EBR)-treated Arabidopsis thaliana seedlings under non-stress and heat stress (HS) conditions was carried out. Microarray data analysis indicated that stress-related genes were predominant within the EBR up-regulated gene data set. Furthermore, several of these genes were abscisic acid (ABA) and jasmonic acid (JA) related. Measurements of endogenous hormones showed significant increases in the levels ABA …