Student problem behavior continues to be a major issue in schools for both teachers and students. Teachers often feel they are not provided with enough resources to help them manage this problem behavior. Students who engage in problem behavior tend to struggle socially and academically. When classified with an emotional disturbance, students are especially at risk due to the severity of the problem behavior they exhibit (Brauner & Stephens, 2006). This study examined how function-based interventions can help both teachers and students better manage the effects of problem behavior. There are several factors believed to hinder the effectiveness of function-based interventions, including time available, training, parental involvement, and fidelity of implementation (Ingram et al., 2005). The study used the critical incident technique (CIT) qualitative methodology to identify helping and hindering factors in the implementation of behavior intervention programs (BIP). Participants of the study include BIP implementers, defined as any school personnel who directly participates in the implementation of an effective BIP with a student. Using the CIT qualitative methodology and semi-structured interviews, the research team determined which events are most prevalent in the hindering and helping of BIP implementation. Research concluded that ongoing collaboration with colleagues, in- and out-of-class support, consistent data tracking, reward systems, calming down strategies, and relationships were the most helpful factors reported by teachers. Unexpected events, severity of behaviors, inconsistent reward systems, differing opinions amongst team members, inconsistent communication, and insufficient training were factors that hindered BIP efficacy based on the results of this study. The findings suggest that the implementation of BIPs can be improved with greater consistency in consequences, clear communication among stakeholders, and building meaningful relationships of trust.

Noncompliance in students with Emotional/Behavioral Disorders (EBD) can contribute to difficulty with peer and teacher relationships and may result in reduced time for academic instruction. The Precision Request, an intervention which uses alpha commands, verbal praise, and reductive consequences, has been shown to increase compliance in students with EBD, but no studies have accounted for which component is responsible for the change. This study used an ABCDAX add-in component analysis to determine which component of the Precision Request produced the most effect on behavioral compliance in five sixth-grade elementary students with EBD. Data were collected on percent of student compliance, latency to compliance, and teacher and paraprofessional use of verbal praise and reductive consequences. Percent of correct implementation of the Precision Request was also recorded. All data were subsequently inspected via visual analysis. The interventionists which participated in the study were unable to implement the Precision Request with fidelity and no effect was found on student compliance, which prompted researchers to examine characteristics of the interventionists as a possible explanation for failure to implement with fidelity. A comparison of interventionists suggests that the Precision Request may be too difficult to implement for an individual who lacks behavioral training, who does not use foundational classroom procedures such as positive reinforcement and verbal praise, and/or whose philosophical viewpoints are not conducive to behavior analysis. Future research should examine contextual fit as regards behavioral interventions and interventionists, as well as which behavioral principles need to be mastered by an interventionist before the Precision Request can be implemented with fidelity.

The National Diabetes Prevention Program (National DPP) was established by Congress in 2010, with a focus on disseminating the evidence-based Lifestyle Change Program (LCP). This 12-month program consists of 26 lessons covering various topics related to goal setting, tracking food and physical activity, motivation, and support groups. Many organizations, including Cooperative Extension (CE), have adopted this program. In the first study conducted by the Virginia Cooperative Extension (VCE), the outcomes of the prediabetes LCP were examined across different age groups and delivery modalities. It was found that distance learning LCPs had slightly higher enrollment levels compared to in-person programs (51% vs. 49%). Moreover, participants aged 60 and older had a significantly higher attendance rate in the distance learning program. The VCE LCP resulted in 49 participants (35%) achieving at least a 5% weight loss, with 29 of them being 60 years or older. When considering the program delivery method, a higher percentage of individuals enrolled in distance learning programs (53%) achieved at least a 5% weight loss. Additionally, 86 participants (62%) engaged in an average of 150 minutes of physical activity per week, with a higher percentage in the in-person programs (64%) and among those aged 60 and older (67%). In Study 2, the distance learning LCP implementation fidelity was evaluated across five states, along with its association with program outcomes. The evaluation tool assessed structural and instructional implementation components. The results indicated that certain structural components directly influenced increased physical activity among participants. Additionally, the coaches' preparedness for the sessions directly impacted participants' weight loss. In addition to implementation fidelity, age was identified as an independent factor affecting weight loss percentage and attendance. Overall, the findings from both studies underscore the significance of effective implementation fidelity to program design in achieving desired health outcomes. The LCP shows promise as an intervention for individuals at risk of developing type 2 diabetes and can be effectively implemented through both in-person and distance learning methods by Cooperative Extension programs nationwide. / Doctor of Philosophy / The prevalence of diabetes and prediabetes in the United States is a significant concern. The Centers for Disease Control (CDC) reported that around 34.2 million people in the U.S. have diabetes, with approximately 96 million adults having prediabetes in 2022. Lifestyle changes, such as increasing physical activity and losing weight, can reduce the risk of prediabetes progressing to diabetes. In response, the CDC established the National Diabetes Prevention Program (National DPP) in 2010, focusing on an evidence-based Lifestyle Change Program (LCP). The LCP is a 12-month program covering various topics and has been adopted by organizations like Cooperative Extension (CE). Two studies were conducted to assess the effectiveness and implementation of the LCP. The first study, carried out by the Virginia Cooperative Extension (VCE), compared outcomes of distance learning and in-person LCPs among adults of different ages. It found slightly higher enrollment levels in distance learning programs and observed a higher attendance rate among participants aged 60 and older in the distance learning program. The study showed that the VCE LCP resulted in a 35% weight loss for 49 participants, with 59% of them being 60 years or older. Distance learning programs also had higher success rates in achieving a 5% weight loss and 150 minutes of physical activity per week. The second study evaluated the implementation fidelity of the distance learning LCP conducted by Cooperative Extension in five states. It found that certain program components, both structural and instructional, directly influenced participants' physical activity levels. The preparedness of coaches for the sessions significantly impacted weight loss outcomes. In addition to implementation fidelity, age was identified as an independent factor affecting weight loss and attendance. Both studies underscore the importance of effective program implementation fidelity to program design in achieving desired health outcomes. The findings support the LCP as a promising intervention for individuals at risk of developing type 2 diabetes. It highlights its effectiveness through both in-person and distance learning methods implemented by Cooperative Extension programs nationwide.

Renewed interest in returning to the Moon, emboldened by recent directives and missions by NASA, has necessitated the establishment of lunar infrastructure to support continuous human presence. With that, the objective of making this return more cost effective has gained significant importance. Low energy lunar transfers are more efficient ways to reach the Moon than the traditional Hohmann-type transfer. These trajectories leverage the multi-body gravitational effects to reduce overall delta-v requirements, in some cases removing the capture delta-v completely. While the time of flight for these transfers can be much longer than a Hohmann-type transfer, the chaotic design space of these transfers can enable large changes in arrival conditions at the Moon for small changes in initial conditions. Many investigations of these transfers take place in simplified dynamical models, such as the Planar Circular Restricted Three Body Problem, with very few higher-fidelity models being implemented. This approach is good to understand the dynamics of these trajectories as well as provide initial guesses for higher-fidelity models; but approximating the dynamics heavily make these models less applicable to mission design. This thesis aims to investigate the application of a higher-order model to simulate these trajectories. STK Astrogator was used to recreate the NASA GRAIL trajectory; and from the recreated trajectory, a nominal trajectory absent of mid-course corrections was established. This nominal trajectory was used to perform parametric and variational studies of departure and arrival conditions as well as compare to a nominal trajectory in a reduced-fidelity model. An investigation into the post launch correction burn requirements following launch vehicle under-performance was completed. Utilizing low energy transfers proved beneficial to adjusting arrival conditions for low delta-v requirements. All arrival inclinations are reasonably achievable for around 255 m/s. Using 255 m/s as a baseline, right ascension of the ascending node could be reached in a 40 degree range and argument of periapsis in a 50 degree range. Lunar insertion arrival can be varied by 7 hours on either side for less than 80 m/s. Trans-lunar injection epoch can be varied by 7 hours on either side of nominal departure for less than 4 m/s. Orbit radius and initial velocity are the most expensive errors to correct. These trajectories can be tuned to reduce the overall mid-course correction delta-v requirement for differing arrival inclinations if other orbital elements are relaxed. A relationship between placement of post-launch correction maneuver for velocity or radius errors was found. Comparing the trajectory in STK to the Inclined Bi-Elliptic Restricted Four Body problem, revealed that timing of the trajectory is variable while keeping the same arrival and departure conditions. However, solar radiation pressure cannot be ignored for more accurate simulation of these trajectories. This investigation has shown that low energy lunar transfers are a viable method to reach the Moon and their chaotic nature can be leveraged to relax restrictions in the design space. / Master of Science / Returning to the Moon has become a more important goal within the space industry. This has required more cost-efficient ways to reach the Moon; an important cost savings being fuel. Traditional ways to reach the Moon required large amounts of fuel to be expended to remain around the Moon after launch. Low energy lunar transfers aim to reduce fuel usage while still reaching the Moon, although they take much longer to reach their destination. Fuel and energy have direct comparisons and are used to evaluate these transfers. These transfers are highly susceptible to changes in their trajectory making them ideal for transferring to the Moon in different orientations. These changes can be made using very little fuel, allowing for more resources to be brought to the Moon. Navigating these transfers to the Moon require an accurate model of space for mission design.

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Understanding what restricts vital rates is crucial in conservation efforts. For migratory birds, vital rates can be impacted by conditions experienced throughout the year. Migratory shorebird populations are rapidly declining, including populations of Dunlin (<i>Calidris alpina arcticola</i>), an Arctic-breeding shorebird. Prior adult survival estimates (0.41– 0.60) appeared insufficient to maintain a stationary population, however, it was unclear if estimates were reflective of bias or a real survival signal. Additionally, C. a. arcticola mate fidelity has yet to be determined, and because demographic rates can be linked to breeding ecology, understanding factors affecting both adult survival and mate fidelity might illuminate specific constraints on demographic rates for this species. I used a Barker (1997) model to estimate true survival (unbiased relative to fidelity) rates of adult C. a. arcticola using 19 years (2003 – 2021) of mark-recapture data and environmental data, collected from a breeding area, Utqiaġvik, Alaska, U.S.A. Breeding site data were supplemented with resighting observations and habitat data from non-breeding sites in eastern Asia (Japan, China, Taiwan). I examined breeding site environmental (temperature, snow melt date, precipitation) and ecological (predator abundance and predator-prey cycles, food resources, shorebird nesting density) in conjunction non-breeding site habitat (area of intertidal extent) effects on survival estimates. True survival averaged 0.62 (95% C.I. 0.50 – 0.72), and marginally declined six percent throughout the study period. Survival was positively related to intertidal extent on non-breeding grounds and heavy precipitation events on the breeding grounds; with precipitation influence on survival likely being driven by outliers in the data. I propose intertidal habitat (which declined 22% across 19 years) is likely a core driver of low survival rates. These results enforce that low adult survival rates are suppressing C. a. arcticola populations, as while other demographic rates (reproductive output, breeding propensity) are comparable with North American Arctic-breeding C. alpina subspecies, both adult survival rates and estimated population growth remain relatively lower. I emphasize that conservation efforts should be focused at areas currently losing intertidal habitat within the East Asian-Australasian Flyway to mitigate future C. a. arcticola declines. Using C. a. arcticola breeding site data, I tested four hypotheses to understand divorce in C. a. arcticola: the better option hypothesis, in which divorce improves reproductive success by obtaining a higher quality mate; the habitat mediated hypothesis, when divorce might occur if an opportunity exists to nest at a higher quality site than the prior breeding season; musical chairs, in which divorce is related to site-specific settlement choices upon arrival to the breeding grounds; and bet-hedging, in which divorce is more likely when mates arrive to the breeding grounds asynchronously, and an individual will pair with a new mate to avoid the cost of waiting for a previous mate to return to it. I used a logistic regression model to investigate effects on C. a. arcticola divorce with environmental and ecological factors that might influence divorce. Of the females nesting in consecutive years, 20% of those females divorced; and in the cases of males nesting in consecutive years, 55% of those males divorced. Both sexes were more likely to divorce when there was greater availability of experienced mates on the breeding grounds, significantly in males (β = 0.81, 95% CI = -0.65 – 2.28), compared to females (β = 1.27, 95% CI = 0.28 − 2.25). The results indicate males divorce behavior supports the better-option hypothesis, in which males divorced to "upgrade" to a mate with more breeding experience than their prior mate. However, male divorce behaviors also supported the bet-hedging hypothesis, as evidenced by similar nest initiation dates between divorced and reuniting males, which indicated males may divorce to avoid reproductive costs associated with waiting for a later-returning mate. Female divorce behavior was linked to either the habitat-mediated hypothesis, in which individuals attempt to acquire better habitat than their prior breeding site, or the better-option hypothesis, both evidenced by divorced females improving their reproductive success from the prior year. Divorced females exhibited higher egg success rates compared to divorced males, indicating females are likely the sex breaking the pair. Together, the results present novel information concerning C. a. arcticola. The first chapter presents direct connections between intertidal habitat loss and lower adult survival, and enforce calls for restoration of Asian intertidal areas along flyways to aid the conservation of migratory shorebirds. The second chapter provides the first estimates of C. a. arcticola mate fidelity and insight towards better understanding migratory shorebird breeding ecology. / Master of Science / Our understanding what influences bird populations is frequently related to identifying factors affecting population dynamics and breeding ecologies. Arctic-breeding migratory shorebirds face unique circannual challenges, as the Arctic is experiencing rapid and unprecedented climate change. Additionally, climate change and coastline development can significantly alter coastal environments used by shorebirds during non-breeding periods. Dunlin (<i>Calidris alpina arcticola</i>) are Arctic-breeding shorebirds that migrate annually to non-breeding areas in East Asia. Previous estimates of C. a. arcticola adult survival rates raised concerns about population stability, but it was unclear if these estimates reflected real survival patterns. Beyond survival rates, mate fidelity and implications of mate fidelity for this subspecies remains unknown. Understanding mate fidelity can clarify demographic constraints, as it can have significant implications for breeding dispersal and population structure. I used 19 years of data collected from a C. a. arcticola breeding site to obtain unbiased estimates of adult survival, factoring in fidelity to the breeding site, and, considered environmental and ecological variables from both breeding and non-breeding grounds thought to influence adult survival. Results indicated a slightly higher adult survival rate than previously estimated, but still low enough to remain depressive on population growth. Survival was positively linked to non-breeding habitat (intertidal areas). These results emphasize the need for conservation efforts aimed at intertidal areas along East Asian migratory routes and non-breeding locations. Using this same long-term dataset, I tested different divorce hypotheses to understand why C. a. arcticola divorce: which could be for better mates (better-option), to acquire better nesting habitat (habitat-mediated), because of settlement strategies upon arrival to breeding grounds (musical chairs), or due to differences in arrival timing to the breeding grounds between pair members and avoiding associated delayed reproductive costs while waiting for a prior year's mate (bet-hedging). I modeled divorce based on sex, individual breeding experience, arrival timing, annual reproductive output, and prior-year's seasonal environmental conditions at the breeding site. Divorce rates were higher in years when higher variation in mate quality were available breeding site, especially among males, who "upgraded" for higher-quality mates (better-option). Divorce behaviors also supported the bet-hedging hypothesis (divorce happens to avoid the cost of waiting for a previous mate to return) for males, and the habitat-mediated (divorce happens to acquire better breeding site habitat than the prior year) strategy in females. Divorced females had better hatching success then divorced males in the year of divorce, indicating they were the sex initiating divorce most frequently. This study provides insight into C. a. arcticola breeding ecology and demography, offering the first estimates of both true adult survival and mate fidelity rates for this subspecies. These findings contribute to our understanding of migratory shorebird dynamics and aim to support conservation efforts for migratory shorebird populations.

Low health literacy in parents has been linked to increased obesity risk for their children. When providing information to patients with low health literacy, teach-back (TB) and teach-to-goal (TTG) methods are recommended, but no studies have examined the degree to which TB/TTG strategies can be implemented with fidelity in community-based programs. A study was conducted to determine if type of delivery staff (community or research) is related to implementation fidelity; the degree to which TB/TTG methods are necessary for parent/caregiver understanding of childhood obesity learning objectives; and if baseline parent/caregiver health literacy level is related to support call response. Ninety-four families with overweight/obese children aged 8-12 years were enrolled in a pilot childhood obesity intervention that included 6 bi-weekly parent/caregiver support calls integrating TB/TTG methods into a 5 A's approach. Research partners (n=2) delivered all calls in Wave 1. During Waves 2 and 3, community staff (n=5) delivered a majority of calls with training and support from research staff. ). Average completion rate across calls was 62% and did not differ according to participant health literacy level. Community partners were more likely than research partners to complete calls with participants (68% versus 57%), but this trend was not significant. Both research and community partners adhered to call scripts with high fidelity (97% versus 98%). A significant main effect of health literacy level on TB/TTG performance was found for Call 1 and Call 3 during Wave 1 and for Call 1 during Waves 2 and 3 of iChoose (p<0.05, 0.01, and 0.05). An interaction effect of health literacy level and question number was found for Call 3 during Wave 1 only (p<0.05). For all calls in which TB/TTG performance differed significantly by health literacy level, participants with adequate health literacy were found to have better performance. Following the program, participants expressed they felt satisfied and comfortable with follow-up calls (9.1 (2.0) and 9.5 (1.2) on a 10-point scale), while agreeing that calls helped improve their eating and PA habits (8.1 (2.6) and 7.5 (2.7)) and helped them learn class material better (8.1 (2.7)). Trained community partners were able to deliver the same support call content with similarly high fidelity, completion, and acceptability. Although participant baseline health literacy level had less impact on the need for TB/TTG and on program perception than we anticipated, our findings open up different possibilities to utilize these strategies while using precious resources more efficiently. / Master of Science

Use of Slotted Waveguide Antenna Stiffened Structures (SWASS) in future commercial and military aircraft calls for the development of an airworthiness certification procedure. The first step of this procedure is to provide a computationally low-cost method for modeling waveguide antenna arrays on the scale of an aircraft skin panel using a multi-fidelity model. Weather detection radar for the Northrop Grumman X-47 unmanned air system is considered as a case study. COMSOL Multiphysics is used for creating high-fidelity waveguide models that are imported into the MATLAB Phased Array Toolbox for large-scale array calculations using a superposition method. Verification test cases show that this method is viable for relatively accurate modeling of large SWASS arrays with low computational effort. Additionally, realistic material properties for carbon fiber reinforced plastic (CFRP) are used to create a more accurate model. Optimization is performed on a 12-slot CFRP waveguide to determine the waveguide dimensions for the maximum far-field gain and separately for the maximum critical buckling load. Using the two separate optima as utopia points, a multi-objective optimization for the peak far-field gain and critical buckling load is performed, to obtain a balance between EM performance and structural strength. This optimized waveguide is then used to create a SWASS array of approximately the same size as an aircraft wing panel using the multi-fidelity modeling method that is proposed. This model is compared to a typical conventional weather radar system, and found to be well above the minimum mission requirements. / Master of Science

In virtual worlds, designers often consider "real walking" to be the gold standard when it comes to locomotion, as shown by attempts to incorporate walking techniques within tasks. When real walking is not conceivable due to several different limitations of virtual interactions (space, hardware, tracking, etc.) a walking simulation technique is sometimes used. We call these moderate interaction fidelity techniques and based upon literature, we can speculate that they will often provide an inferior experience if compared to a technique of high or low fidelity. We believe that there is an uncanny valley which is formed if a diagram is created using interaction fidelity and user effectiveness. Finding more points on this graph would help to support claims we have made with our hypothesis. There are several studies done previously in the field of virtual reality, however a vast majority of them considered interaction fidelity as a single construct. We argue that interaction fidelity is more complex involving independent components, with each of those components having an effect of the actual effectiveness of an interface. In addition, the intention of the designer can also have influence on how effective an interface can be. In this study we are going to be doing a deeper look into devices which attempt to overcome the limitations of physical space which we will call semi-natural interfaces. Semi-natural interfaces are sometimes difficult to use at first due to mismatch of cues or possibly due to a lack of fidelity, but training has been shown to be beneficial to overcome this difficulty. As of today, designers have not yet found a fully general solution to walking in large virtual environments. / Master of Science