No / This paper describes a set of experiments that investigated the use of rising pitch notes to communicate graphical information to visually impaired users. The information communicated in the experiments included coordinate locations within a 40×40 graphical grid, the navigation of an auditory cursor within the graphical grid, the communication of simple graphical shapes and their size. The five simple shapes communicated were rectangles, squares, circles, horizontal and vertical lines. Stereophony, timbre, rhythms, and short tunes were used in addition to the rising pitch metaphor to aid disambiguation. Results suggested that the rising pitch approach enabled visually impaired users to understand the graphical information communicated in the absence of any visual aid. The paper concludes with a discussion of the use of rising pitch metaphor to communicate graphical information.

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As social workers we understand that service users are the most impacted stakeholders involved in service delivery models at various agencies. When it comes to the field of child welfare, there are added barriers and complications that impact a worker’s ability to develop relationships with service users. What do child welfare service users consider to be “good” social work practice, and what do they expect from their workers? This thesis will focus on the voices of those who have been most impacted by the system: those who are or have been in the care of a child welfare system. At McMaster University, a program is being initiated in partnership between the School of Social Work and various local Children’s Aid Societies in Hamilton and the surrounding areas, which will explore how child welfare service users can be incorporated into the education of social work students who plan to work in the field of child welfare. This thesis will explore what individuals who are or have been youth in the care of an Ontario Children’s Aid Society want to teach the students of this program before they become child welfare social workers. This expert feedback will then be incorporated into the curriculum of McMaster’s program, entitled: “Preparing for Critical Practice in Child Welfare” (PCPCW), which will be carried into practice by the students who graduate from the program to become child welfare social workers. / Thesis / Master of Social Work (MSW)

Context: During an influx of users during a short period of time there will most likely be more issues reported and discovered. This will lead to more work for the software developer team. Will this affect the development of the software and, if so, how?Objectives: Research how the large amount of new users Zoom received during the start of the covid-19 pandemic affects the development of new features, changes to old features, bug/issue resolving and scheduled updates/maintenance.Realization (Method): We are using case studies as our empirical method. We are looking through and analyzing the incident logs and release notes that are provided by Zoom. With the help of the acquired data we can make observations and compare them to find connections between the increase in user base and issues found/features released. Results: With the data we extracted from Zoom’s incident logs and release notes, we could conclude that the influx of new users increased the number of bugs/issues found.Scheduled updates and maintenance saw a decline as the covid outbreak continued.The total number of features added/changed were not diminished, but instead increased. Conclusions: From the results we conclude that an increased user base leads to more issues and the need to implement new un-scheduled features to improve scalability, which induced a lower focus on scheduled maintenance/updates.

In the United States, there were 36,560 traffic-related fatalities in 2018, of which 20% were pedestrians, bicyclists, and other vulnerable road users (VRUs) [1]. Vulnerable road users are non-vehicle occupants who, because they are not enclosed in a vehicle, are at higher risk of injury in traffic crashes. While overall traffic fatalities in the US have been decreasing, pedestrian and bicyclist fatalities have been trending upward. Vehicle-based active safety features could avoid or mitigate crashes with VRUs, but are highly dependent on the ability to detect a VRU with enough time or distance. This work presents methods to examine the characteristics of vehicle-pedestrian and vehicle-bicycle crashes and near-crashes using a variety of data sources, assess the potential effectiveness of Automatic Emergency Braking (AEB) in avoiding and mitigating VRU crashes through modeling and simulation, and estimate the future benefits of AEB for VRU safety in the United States. Additionally, active safety features are most effective when behavior of VRUs can be anticipated, however, the behavior of pedestrians and bicyclists is notoriously unpredictable. Therefore, an approach to examine and categorize pedestrian behavior in response to near-crashes and crashes events is presented. Overall, findings suggest that AEB has great potential to avoid and mitigate collisions with pedestrians and bicyclists, but it cannot avoid all crashes even when an idealized AEB system is assumed. Most pedestrians and bicyclists were found to be visible for at least one second prior to the crash, but obstructions, the unpredictability of VRUs, and adverse weather/lighting conditions still pose challenges in avoiding and mitigating crashes with VRUs. / Doctor of Philosophy / In the United States, there were 36,560 traffic-related fatalities in 2018, of which 20% were pedestrians, bicyclists, and other vulnerable road users (VRUs) [1]. Vulnerable road users are non-vehicle occupants who, because they are not enclosed in a vehicle, are at higher risk of injury in traffic crashes. While overall traffic fatalities in the US have been decreasing, pedestrian and bicyclist fatalities are trending upward. Vehicle-based countermeasures, such as Automatic Emergency Braking (AEB), could avoid or mitigate crashes with VRUs, but are highly dependent on the ability to detect a VRU with enough time or distance. My work presents methods to examine the characteristics of vehicle-pedestrian and vehicle-bicycle crashes and near-crashes using a variety of data sources, assess the potential effectiveness of AEB in avoiding and mitigating VRU crashes through modeling and simulation, and estimate the future benefits of AEB for VRU safety in the United States. Additionally, crash avoidance technologies are most effective when behavior of VRUs can be anticipated, however, the behavior of pedestrians and bicyclists is notoriously unpredictable. Therefore, I examined and categorized pedestrian behavior in response to near-crashes and crashes events. Overall, we found that AEB has great potential to avoid and mitigate collisions with pedestrians and bicyclists, but it cannot avoid all crashes even when assuming an idealized AEB system. Most pedestrians and bicyclists were found to be visible for at least one second prior to the crash, but obstructions, the unpredictability of VRUs, and adverse weather/lighting conditions still pose challenges in avoiding and mitigating crashes with VRUs.