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A dissertation submitted to the Faculty of Health Sciences, University of the Witwatersrand, 5 February 2019, in fulfilment of the requirements for the degree Master of Science in Medicine / Adult age estimation is of value when creating a biological profile for an unknown set of human remains. Two age estimation methods, the well-known Suchey-Brooks method and the newly introduced Enhanced Computational methods were investigated. Differences between males and females as well as between populations necessitate further research to ascertain whether these methods were accurate enough to be used within a white South African population. A total of 184 well-preserved os coxae were sampled from white South African individuals with known age and sex. The selected os coxae represented male (n=99) and female (n=85) individuals aged 15 to 84 years. The os coxae were subjected to phase analysis, during which the symphyseal surface of the pubis was assigned a phase according to descriptions and pubic symphyseal casts. Following phase analysis, the pubic symphyses were scanned using an Artec Spider 3D scanner. After processing, the laser scans were uploaded into two versions of the forAge program to obtain seven different point estimates for the age-at-death of an individual. The Suchey-Brooks method performed well in a white South African population with statistically significant moderate positive correlations and relatively low biases in both males and females. In contrast, the Enhanced Computational methods performed poorly with weak correlations and higher biases than that observed for the Suchey-Brooks method. The Enhanced Computational methods, however, show a decrease in the intra and inter-observer error typically associated with phase-based methods. Currently, the Suchey-Brooks method can be used in a white South African population, although room for improvement exists. On the other hand, population specific formulae need to be developed for the Enhanced Computational methods before they can used in a white South African population. / E.K. 2019

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As an increasingly powerful, interactive, and dynamic medium for sharing information, the World Wide Web (Web) has found many educational applications. Because of educational benefits for both learners and educators, Web-based courses and programs have increasingly been developed and implemented by many academic institutions, organizations, and companies worldwide (Aggarwal & Brento, 2000). This study, however, asserts that many of the developmental approaches lack three important considerations to be used for implementing learning applications based on the Web: (1) integration of the human-computer interface design with instructional design, (2) development of the evaluation framework to improve the overall quality of Web-based learning support environments, and (3) development of an individualistic approach to the Web hosting of courses. This study explored the three Web-based learning environment weaknesses while developing a user-centered, Web-based learning support environment for Global Positioning System (GPS) education: Web-based distance and distributed learning (WD2L) environment. Research goals of the study were all concerned with the improvement of the design process and usability of the WD2L environment based on a theory-based Integrated Design Process (IDP) proposed in the study. Results indicated that the proposed IDP was effective in that the study showed (1) the WD2L environment's equivalence to traditional supplemental learning, especially as a Web-based supplemental learning program and (2) users' positive perceptions of WD2L environment resources. The study also confirmed that for an e-learning environment to be successful, various aspects of the learning environment as a Web-based supplemental learning program should be considered such as application domain knowledge (i.e., target subject field), conceptual learning theory, instructional design, human-computer interface design, and evaluation about the overall quality of the learning environment. / Ph. D.

Responding to the need within the human-computer interaction field to address ubiquitous and multitasking systems more scientifically, this research extends the usefulness of a new research framework for a particular class of systems. Notification systems are interfaces used in a divided-attention, multitasking situation, attempting to deliver current, valued information through a variety of platforms and modes in an efficient and effective manner. Through review of literature and experiences with empirical dual-task perceptual studies, we recognize a lack of unifying framework for understanding, classifying, analyzing, developing, evaluating, and discussing notification systems--fundamentally inhibiting scientific growth and knowledge reuse that should help designers advance the state-of-the-art. To this end, we developed a framework (referred to as the IRC framework) for notification systems research based on a core taxonomy of critical parameters describing user goals. Next, we extend the framework, focusing on three key aspects: 1) a system description process, allowing articulation of abstract design objectives that focus on critical user requirements; 2) interface usability evaluation tools, enabling comparison of the design and user's models, while supporting generalizability of research and early identification of usability concerns; and 3) design comparison and reuse mechanisms, saving time and effort in requirements analysis and early design stages by enabling design reuse and appreciation of design progress. Results from this research include the development of tools to express IRC design models (IRCspec) and user's models (IRCresults), and the extension of the critical parameters concept. Validation studies with novice designers show sufficient assessment accuracy and consistency. Leveraging these tools that help designers express abstract, yet critical, design intentions and effects as classification and retrieval indices, we develop a repository for reusable design knowledge (a claims library). Responding to challenges of design knowledge access that we observed through initial user testing, we introduce a vision for an integrated design environment (LINK-UP) to operationalize the IRC framework and notification systems claims library in a computer-aided design support system. Proof-of-concept testing results encourage the thought that when valuable design tools embody critical parameters and are coupled with readily accessible reusable design knowledge, interface development will improve as a scientific endeavor. / Ph. D.

Background: Physical inactivity of the general population is a major public health concern in the US and around the world. Community-based interventions that include evidence-based principles of group dynamics are effective at improving individual-level physical activity behaviors as well as changing social norms for health behaviors. The use of technologies such as smartwatches has a potential to channel and amplify underlying group dynamics principles in such interventions. In order to explore the use of smartwatches for group dynamics-based physical activity interventions, a smartwatch centered system was designed and deployed as part of an eight-week pilot study. Objectives: The primary goal of this study was to explore the degree to which smartwatches effectively channel group dynamics strategies in the context of an eight-week community based physical activity intervention. Methods: In this explanatory mixed-methods study, system usage data were analyzed (e.g., frequency of interaction with smartwatch and smartphone) and participant physical activity (e.g., participant steps tracked by the system). To provide a richer picture of the user experience, use of features, and impact of group dynamics, participants were invited to participate in one-on-one interviews after the pilot program. The group dynamics-based questions centered on the individual’s attraction to the group task and socially as well as the individual’s perception of group integration around the task and as a social unit (i.e., the four dimensions of cohesion). The interview recordings were transcribed verbatim and analyzed via an abbreviated grounded theory approach. The system usage data was visually and numerically summarized. Results: Five of the seven participants completed interviews. The interview analysis resulted in 365 meaning units representing 2 themes (related to user experience with devices and manifestations of group dynamic principles), 4 sub-themes and 23 categories. The participants completed 31.3 (SD=2.91) miles per week and engaged with the smartwatch and the Android app 2.6 and 1.5 times a day, respectively. Analysis of interviews and the system usage logs from five participants, reveal sustained engagement with the smartwatch and the smartphone app. The system facilitated self-reflection and awareness in terms of physical activity levels, encouraged interactions with the team members and helped them to stay aware of the daily goals. Additionally, the participants reported habit formation in terms of wearing and using the smartwatch on the daily basis. Implications: This study provides preliminary support that accessible information via the custom smartwatch watchface can be a viable solution for retaining higher participant engagement during group dynamics-based community interventions. Such devices can help expand group-dynamics interventions by making them less depended on in-person delivery methods. / Master of Science / Physical inactivity of the general population is a major public health concern in the US and around the world. Community-based interventions, with group dynamics strategies at the core, are effective at improving individual physical activity behaviors. The use of technologies such as smartwatches has potential to channel and amplify the underlying program principles in such interventions. This work presents a smartwatch-centered system to encourage group cohesion in physical activity interventions, exploring it as part of an eight-week study that revealed participant awareness of group performance through smartwatch interactions.

Modern operating systems allow users to organize and refind information using many contextual keys such as timestamps, content, custom tags, origin and even location. As humans naturally engage in activities with people and groups of people, we want to investigate how we can use the context of people's social interactions to support information archiving and refinding. Past research has tracked and used remote, social interactions through email communication; this work will concentrate on using physical, social interactions (i.e., face-to-face) to support information archiving and refinding. Research questions include: (1) How do we effectively associate one's information with one's social world? (2) How do we design a user interface that supports refinding information based on social contexts? and (3) How does our approach (i.e., system) affect the users information archiving and refinding practices? This dissertation presents results from two user studies, exploring two refinding systems. The first, longitudinal study examines three participants using a custom refinding tool that tags information based on the people physically present with the user. Our second, diary-driven study examines a refinding tool that integrates information activity with a person's calendar. Our contributions are threefold: (1) an exploration of adding physical social interactions as contextual keys for information archiving and refinding (2), an examination of two user interface designs that enable users to refind information through their physical-social interactions (i.e., people and groups), and (3), a diary-driven methodology for studying realistic refinding behaviors while reducing participant interruptions. / Ph. D.