Effective communication is crucial for successful behavior change. However, despite much research in training and development, instructional communication, and public health surrounding communication, it is still unclear what constitutes such effective delivery behaviors, especially for an adult learner population (those over 25 years old). Using cognitive load theory and cognitive-affective theory of learning with media as theoretical frameworks, this dissertation proposes a quality of delivery scale for measuring effective communication across instructional settings with an adult learner audience. Informed by public health, training and organizational communication, as well as adult education and instructional communication, the final valid and reliable QD scale consists of seven communication characteristics that are associated with reduced cognitive load, increased motivation, and increased compliance. Ultimately, this three-phase study consisted of: (a) developing the QD scale, (b) confirming the factor structure, as well as convergent and predictive validity, and (c) testing a theoretical model of QD.

Recently, there has been a significant rise in the Hyper-Text Transfer Protocol (HTTP) video streaming usage worldwide. However, the knowledge of performance of HTTP video streaming is still limited, especially in the aspect of factors which affect video quality. The reason is that HTTP video streaming has different characteristics from other video streaming systems. In this thesis, we show how the delivered quality of a Flash video playback is affected by different factors from diverse layers of the video delivery system, including congestion control algorithm, delay variation, playout buffer length, video bitrate and so on. We introduce Quality of Delivery Degradation (QoDD) then we use it to measure how much the Quality of Delivery (QoD) is degraded in terms of QoDD. The study is processed in a dedicated controlled environment, where we could alter the influential factors and then measure what is happening. After that, we use statistic method to analyze the data and find the relationships between influential factors and quality of video delivery which are expressed by mathematic models. The results show that the status and choices of factors have a significant impact on the QoD. By proper control of the factors, the quality of delivery could be improved. The improvements are approximately 24% by TCP memory size, 63% by congestion control algorithm, 30% by delay variation, 97% by delay when considering delay variation, 5% by loss and 92% by video bitrate.

Hospital performance metrics are an indicator of leadership performance. However, there is inadequate research on whether physician or nonphysician chief executive officers (CEOs) perform better in the U.S. hospitals. The purpose of this study was to examine which type of leaders is better. Leadership trait, situational leadership, and leadership behavior theories constituted the theoretical foundation. The key research question examined the relationship between a hospital's outcomes, which in this study, included hospital net income, patient experience ratings, and mortality rates, and the type of CEO in that hospital: physician or non-physician. A quantitative, causal comparative design was used to answer this question. Three hypotheses were tested using multivariate analysis of variance. The dependent variable was hospital outcomes: hospital net income, patient experience ratings, and mortality rates. The independent variable was the type of hospital CEO: physician and nonphysician. Datasets from 2014-2015 were used, which were publically available on the websites of U.S. based hospitals, research organizations, and journals. A sample of 60 hospitals was drawn from U.S. non-federal, short-term, acute care hospitals, based on number of staffed beds (n = 60). No significant differences were found between nonphysician and physician CEOs on hospitals' net income (p = .911), patient experience ratings (p = .166), or mortality rates (p = .636). Thus, the null hypotheses were retained. Findings suggest that physician and non-physician CEOs may produce similar outcomes in the hospitals they lead. Based on these findings, hospital boards can view CEO applicants equally when considering whom to hire and understanding U.S. hospital leadership.