A method for decomposing the user cursor action component of human-computer interfaces into individual components based on the four categories: target size, target distance, target direction, and selection mode, was investigated. A primitive task set consisting of the Cartesian product of specific elements of the four categories listed above was proposed based on observation of user tasks and a cursor action benchmark task set was developed to measure a user's performance for each element of the set of primitive elements with a given cursor control device. An experiment was conducted to test the proposed primitive task set and associated benchmark task set as a predictor of performance for a set of representative graphics tasks. The predicted times and actual times were shown to have very strong correlations and the data were also shown to conform to Fitts' Law. A description of the experiment, the data collected, and the analysis of these data are included. / Master of Science

The purpose of this study was twofold. First, it aimed to present and understand the experiences of online gamers from the paradigm of positive psychology. To achieve this, the phenomenon of flow was investigated to see whether or not, it is experienced whilst gaming online and if present, how it is revealed in this context. The second purpose was to contribute to theory building and to respond to extant research recommendations. Aligned with a qualitative orientation, the method selected to achieve the objectives of the study was interpretative phenomenological analysis. A sample of four participants who met the criteria for inclusion in the research were selected and interviewed using semi-structured interviews. Data was analysed and interpreted inductively and categorised into superordinate themes. These were presented as two sections: Section A explored the experience and meaning of online gaming through the following three superordinate themes; intention, pre-gaming rituals and gaming process. Section B discussed the social experience and meaning of gaming online through the superordinate theme, a gamers way. This study both challenged and supported theory and research in the field and introduced novel areas, such as pregaming rituals and the subthemes; marijuana and gaming space. This is a notable and promising "side effect" of a research design that is exploratory. Findings called for future multi-disciplinary research into flow, gaming and online relationships considering Csikszentimaihalyi‟s concept of autotelic relationships and Heideggers‟ philosophical framework.

Indiana University-Purdue University Indianapolis (IUPUI) / Pedestrian and vehicle interaction analysis in a naturalistic driving environment can provide useful information for designing vehicle-pedestrian crash warning/mitigation systems. Many researchers have used crash data to understand and study pedestrian behaviors and interactions between vehicles and pedestrian during crash. However, crash data may not provide detailed pedestrian-vehicle interaction information for us. In this thesis, we designed an automatic pedestrian tracking and status analysis method to process and study pedestrian and vehicle interactions. The proposed pedestrian tracking and status analysis method includes pedestrian detection, pedestrian tracking and pedestrian status analysis modules. The main contributions of this thesis are: we designed a new pedestrian tracking method by learning the pedestrian appearance and also their motion pattern. We designed a pedestrian status estimation method by using our tracking results and thus helped estimate the possibility of collision. Our preliminary experiment results using naturalistic driving data showed promising results.

Indiana University-Purdue University Indianapolis (IUPUI) / Health Information Technology (HIT) has become an integral component of healthcare today. The HITECH Act (2009) and Meaningful Use objectives stand to bring wide-sweeping adoption and implementations of HIT in small, medium and large sized healthcare organizations across the country. Though recent literature has provided evidence for the benefits of HIT in the profession, there have also been a growing number of reports exploring the adverse effects of HIT. There has not, however, yet been a systematic account of the adverse effects of HIT in the healthcare system. The current push for HIT coupled with a lack of critical appraisal of the potential risks of implementation and deployment within the medical literature has led to a general unquestioning and unregulated acceptance of the implementation of technology in medicine and healthcare as a positive addition with little or no risk. While the benefits of HIT are clear, a review of the existing studies in the literature would provide a holistic vision of the adverse effects of HIT as well as the types and impact within the nation’s health care system to inform future HIT development and implementation. The development of a general understanding of these adverse effects can serve as a review and summary for the use of informatics professionals and clinicians implementing HIT as well as providing future direction for the industry in HIT implementations. Additionally, this study has value for moving forward in informatics to develop frameworks for implementation and guidelines and standards for development and regulation of HIT at a federal level. This study involves the use of an integrative literature review to identify and classify the adverse effects of HIT as reported in the literature. The purpose of this study is to perform an integrative review of the literature to 1) identify and classify the adverse effects of HIT; 2) determine the impact and prevalence of these effects; 3) identify the recommended actions and best practices to address the negative effects of HIT. This study analyzed 18 articles for HIT-induced error and adverse consequences. In the process, 228 errors and/or adverse consequences were identified, classified and represented in an operational taxonomic schema. The taxonomic representation consisted of 8 master categories and 30 subcategories. Additionally, the prevalence and impact of these errors were evaluated as well as recommendations and best practices in future systems design. This study builds on previous work in the medical literature pertaining to HIT-induced errors and adverse consequences and offers a unique perspective in analyzing existing studies in the literature using the integrative review model of research. It is the first work in combining studies across healthcare technologies and analyzing the adverse consequences across 18 studies to form a cohesive classification of these events in healthcare technology.