Information Systems today rarely are contained within a single user workstation, server, or networked environment. Data can be transparently accessed from any location, and maintained across various network infrastructures. Cloud computing paradigms commoditize the hardware and software environments and allow an enterprise to lease computing resources by the hour, minute, or number of instances required to complete a processing task. An access control policy mediates access requests between authorized users of an information system and the system's resources. Access control policies are defined at any given level of abstraction, such as the file, directory, system, or network, and can be instantiated in layers of increasing (or decreasing) abstraction. For the system end-user, the functional allocation of security policy to discrete system components, or subsystems, may be too complex for comprehension. In this dissertation, the concept of a metapolicy, or policy that governs execution of subordinate security policies, is introduced. From the user's perspective, the metapolicy provides the rules for system governance that are functionally applied across the system's components for policy enforcement. The metapolicy provides a method to communicate updated higher-level policy information to all components of a system; it minimizes the overhead associated with access control decisions by making access decisions at the highest level possible in the policy hierarchy. Formal definitions of policy often involve mathematical proof, formal logic, or set theoretic notation. Such policy definitions may be beyond the capability of a system user who simply wants to control information sharing. For thousands of years, mankind has used narrative and storytelling as a way to convey knowledge. This dissertation discusses how the concepts of storytelling can be embodied in computational narrative and used as a top-level requirements specification. The definition of metapolicy is further discussed, as is the relationship between the metapolicy and various access control mechanisms. The use of storytelling to derive the metapolicy and its applicability to formal requirements definition is discussed. The author's hypothesis on the use of narrative to explain security policy to the system user is validated through the use of a series of survey instruments. The survey instrument applies either a traditional requirements specification language or a brief narrative to describe a security policy and asks the subject to interpret the statements. The results of this research are promising and reflect a synthesis of the disciplines of neuroscience, security, and formal methods to present a potentially more comprehensible knowledge representation of security policy.

Human Immunodeficiency Virus (HIV) remains a serious public health issue, and many social factors are involved in virus transmission and treatment. The current conceptualization of how HIV status disclosure and perceived stigma of HIV diagnosis interact is undeveloped. This study was based on social cognitive theory and tested hypothesized positive relations between HIV serostatus disclosure, social support, and self-efficacy. In addition, self-rated HIV stigma was examined as a potential mediating variable. Participants were 109 HIV positive, mostly White gay men recruited via an online bulletin board. They completed the medical outcomes study social support survey, the general self-efficacy scale, the HIV stigma scale, a HIV serostatus disclosure questionnaire, and a demographic questionnaire. Linear regression revealed that social support significantly and positively predicted HIV serotatus disclosure. HIV stigma mediated this relation by lowering the perception of support. Sexual orientation disclosure significantly and positively predicted HIV serostatus disclosure and social support. It is recommended that future research examine the impact of HIV stigma in different groups (racial and sexual minorities, and women). Culturally-sensitive assessments may also be used to measure individual levels of perceived stigma, HIV status disclosure, and social support. Action for social change includes raising general public awareness regarding HIV misconceptions, such as transmission risk; lowering stigma and raising support through public education; and increasing sexual minority status self-identification via outreach in low self-disclosure communities.

The intent of this thesis is to examine the psychometric properties of a complex span task (CST) developed to measure working memory capacity (WMC) using measurements obtained from a sample of 68 undergraduate students at the University of Central Florida. The Grocery List Task (GLT) promises several design improvements over traditional CSTs in a prior study about individual differences in WMC and distraction effects on driving performance, and it offers potential benefits for studying WMC as well as the serial-position effect. Currently, the working memory system is composed of domain-general memorial storage processes and information-processing, which involves the use of executive functions. Prior research has found WMC to be associated with attentional measures (i.e., executive attention) and the updating function, and unrelated to the shifting function. The present study replicates these relationships to other latent variables in measures obtained from the GLT as convergent and discriminant evidence of validity. In addition, GLT measures correlate strongly with established measures of WMC. Task reliability is assessed by estimates of internal consistency, pairwise comparisons with a cross-validation sample, and an analysis of demographic effects on task measurements.

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<p>Research on backward response compatibility effects (Task 2-to-Task 1 response priming) in the Psychological Refractory Period (PRP) paradigm has suggested that compatibility effects arise from episodic representations of Stimulus-Response (S-R) pairings (Hommel & Eglau, 2002). However, more recent work suggests that these effects are mediated by S-R rules held online in working memory during dual task performance (Ellenbogen & Meiran, 2008). We sought to dissociate these accounts. In Experiment 1, we observed the development of backward response compatibility effects over time in a common PRP task, following varying degrees of prior single task practice of the PRP component tasks. In Experiment 2, we trained participants on a PRP dual task, and then switched Task 2 to one of three different tasks with variable response mapping overlap with the original Task 2, before finally reverting back to the original PRP tasks. Backward response compatibility effects appeared initially, were abolished during the subsequent interference phase, and then reappeared with the original PRP task. Despite equivalent overall performance across conditions suggesting successful task rule instantiation in working memory to guide task performance, backward response compatibility effects were selectively absent in conditions where current S-R rules were mapped in conflict with prior S-R experiences within the experiment. Both experiments provide evidence in favour of an episodic account of backward response compatibility effects, in which prior learning influences subsequent performance in contextually relevant situations. Implications for the understanding of backward response compatibility mechanisms and parallel processing in the PRP paradigm are discussed.</p> / Master of Science (MSc)

<p>When an observer detects changes in a scene from a viewpoint that is different from the learned viewpoint, viewpoint change caused by observer’s locomotion would lead to better recognition performance compared to a situation where the viewpoint change is caused by equivalent movement of the scene. While such benefit of observer locomotion could be caused by spatial updating through body-based information (Simons and Wang 1998), or knowledge of change of reference direction gained through locomotion (Mou et al, 2009). The effect of such reference direction information have been demonstrated through the effect of a visual cue (e.g., a chopstick) presented during the testing phase indicating the original learning viewpoint (Mou et al, 2009).</p> <p>In the current study, we re-examined the mechanisms of such benefit of observer locomotion. Six experiments were performed using a similar change detection paradigm. Experiment 1 & 2 adopted the design as that in Mou et al. (2009). The results were inconsistent with the results from Mou et al (2009) in that even with the visual indicator, the performance (accuracy and response time) in the table rotation condition was still significantly worse than that in the observer locomotion condition. In Experiments 3-5, we compared performance in the normal walking condition with conditions where the body-based information may not be reliable (disorientation or walking over a long path). The results again showed a lack of benefit with the visual indicator. Experiment 6 introduced a more salient and intrinsic reference direction: coherent object orientations. Unlike the previous experiments, performance in the scene rotation condition was similar to that in the observer locomotion condition.</p> <p>Overall we showed that the body-based information in observer locomotion may be the most prominent information. The knowledge of the reference direction could be useful but might only be effective in limited scenarios such as a scene with a dominant orientation.</p> / Master of Science (MSc)

Response to intervention (RTI) is a data driven framework that classifies students into three tiers and provides interventions at different levels of intensity (Flanagan, Ortiz, Alfonso, & Dynada, 2006; Fuchs, Fuchs, & Stecker, 2010, Gilbert et al., 2012). The screening assessments and interventions used for RTI have become generalized (Garcia, Gonzalez-Castro, Fernandez, & Rodriguez-Perez, 2012). Many schools implementing RTI use one screening instrument and one intervention for all struggling readers (Ezpeleta, Granero, Penelo, de la Osa, & Domenech, 2015; Flanagan et al., 2006; Garcia et al., 2012; Gilbert et al., 2012). Executive functioning (EF) is a neuropsychological ability that regulates behaviors and cognitions to guide behaviors to accomplish a goal (Bledsoe, Semrud-Clikeman, & Pliszka, 2010; Coghill, Seth, & Matthews, 2014; Ezpleta et al., 2015; Goldstein et al., 2014; Zelazo, 2016). Inhibition, cognitive flexibility, and working memory are three core processes of EF that affect reading comprehension (Cartwright, 2016; Dahlin, 2011; Miyake et al., 2000). EF assessments and screeners provide valuable information for designing interventions, as most Tier 2 and Tier 3 RTI reading interventions focus primarily on the linguistic nature of tasks without taking into consideration other relevant domains like EF (Garcia-Fernandez et al., 2012; Goldstein et al., 2014). For this study, the researcher collected data on the reading comprehension, language, and EF abilities for 87 elementary school students ages seven through ten. The data were categorized into RTI Tier 1, Tier 2, or Tier 3 depending on their reading comprehension results. Correlations, MANOVAS, and regressions were conducted to analyze the data and study the hypothesis that explored relationships and predictive abilities of EF on reading comprehension. The results demonstrated correlations between the EF abilities and reading comprehension skills. Working memory demonstrated significant predictive capabilities for reading comprehension deficits (RCD). Language abilities demonstrated the strongest predictive ability for RCD. These results have implications for the literature on RTI diagnostic testing/screenings, RTI intervention development, and the implications of EF on RCD. These results support the use of EF rating scales as screening assessments for practitioners to implement when making decisions on RTI.

The U.S. Army conducts extensive training on its core values beginning with initial entry training (IET), commonly referred to as basic training, in order to shape soldiers' behavior and decision making in combat and noncombat situations. This mixed methods study addressed the problem of limited empirical research on the effects of U.S. Army IET on soldiers' moral and character development. The purpose was to explore the effects of Military Police (MP) IET on soldiers in training through a mixed methods quantitative and qualitative model. The theoretical framework for this study was based on Rest's four component model (FCM) of moral development, Hart's model of moral identity, the schemas of the Defining Issues Test (DIT), and the U.S. Army's moral code consisting of the Army values, the Soldiers Creed, and the Warrior Ethos. The DIT was administered at the beginning and conclusion of MP IET to determine change in soldiers' moral judgment. Focus groups of MP IET soldiers identified perceptions of change in moral development. Data analysis using ANOVA and matched pair t tests of DIT scores revealed no significant changes in overall scores, no differences among age groups, and limited differences among genders and educational levels. Results showed significant decline in personal interest scores among females. Focus group results using qualitative content analysis revealed the relationship with drill sergeants as having a significant impact on moral development. This study provides feedback to trainers and leaders on designing effective moral and character education. Soldiers influence societies at home and abroad. This research shows that positive social change is more likely as soldiers receive moral and character education which focuses on developing moral expertise, not just memorization of rules, and which results in moral and trustworthy behavior.

This paper examined the effects of distance priming on test anxiety and judgment. Research suggests that individuals’ perceived distance can impact their affect and judgments, which sheds light on the principle of “distance equals safety” (Williams & Bargh, 2008). Taking an exam invokes both cognitive and emotional anxiety, such as worry, panic, and tension. It is hypothesized that the distance priming may reduce test anxiety—particularly, the emotionality aspect—as well as perceived test difficulty. The results showed that, counter to the hypotheses, there was no significant difference among the three priming groups in their emotional test anxiety or perceived test difficulty. There is a significant correlation between ACT score and cognitive test anxiety, supporting past literature that as one’s intellectual ability increases, their cognitive test anxiety decreases. Further research needs to be conducted to replicate the efficacy of the priming method by Williams and Bargh (2008) and to use more effective ways of provoking performance anxiety.