Electronic Thesis or Dissertation

Hand amputation is a devastating feeling for amputees, and it is lifestyle changing since it is challenging to perform the basic life activities with amputation. Hand amputation means interrupting the closed loop between sensory feedback and motor control. The absence of sensory feedback requires a significant cognitive effort from the amputee to perform basic daily activities with prosthetic hand. Loss of tactile sensations is a major roadblock preventing amputees from multitasking or using the full dexterity of their prosthetic hands. One of the most significant features lacking from commercial prosthetic hands is sensory feedback, according to amputees. Many amputees abandoned their prosthetic devices due to the lack of tactile feedback. In the field of prosthetics, restoring sensory feedback is the most challenging task due to the complexity of integration between the prosthetic and the peripheral nervous system. A prosthetic hand with sensory feedback that imitates the intact hand would improve the lives of millions of amputees worldwide by inducing the prosthetic hand to be a part of the body image and significant impact the control of the prosthetic. To restore the sensory feedback and improve the dexterity for upper limb amputee, multiple components needed to be integrated together to provide the sensory feedback. Tactile sensors are the first components that needed to be integrated into the sensorimotor loop. In this research two tactile sensors were integrated in the sensory feedback loop. The first tactile sensor is BioTac which is a commercially available sensor. The first novel contribution with BioTac is the development of an ANN classifier to detect the direction a grasped object slips in a dexterous robotic hand in real time, and the second novel aspect of this study is the use of slip direction detection for adaptive robotic grasp reflexes. The second tactile sensor is the liquid metal sensor (LMS), this sensor was developed entirely in our lab (BioRobotics lab). The novel contribution for LMS is to detect and prevent slip in real time application, and to recognize different surface features and different sliding speeds.

Immigrants from Bangladesh who have lived in South Florida for years are the subject matter of this qualitative study, which examines their experiences in the United States. I aimed to gain a better understanding of the cultural experiences and obstacles faced by Bangladeshi immigrants in south Florida, as well as their adaptation and acculturation to American culture, using data collected from participant observation and interviews with informants. In-depth interviews allow participants to share their thoughts and feelings about their lives. This study has examined the cultural experience of Bangladeshi immigrants through food, language, religion, cultural practices, and gender roles. This study concludes based on data acquired from Bangladeshi immigrants, which demonstrates that with close contact and influence of other cultures, they are absorbing some aspects of the dominant culture, while they are practicing their own native culture. Ultimately, this thesis examines how Bangladeshis maintain and practice their natal culture in south Florida.

The collaboration between human and computer systems has grown astronomically over the past few years. The ability of software systems adapting to human's input is critical in the symbiosis of human-system co-adaptation, where human and software-based systems work together in a close partnership to achieve synergetic goals. However, it is not always clear what kinds of human’s input should be considered to enhance the effectiveness of human and system co-adaptation. To address this issue, this research describes an approach that focuses on incorporating human emotion to improve human-computer co-adaption. The key idea is to provide a formal framework that incorporates human emotions as a foundation for explainability into co-adaptive systems, especially, how software systems recognize human emotions and adapt the system’s behaviors accordingly. Detecting and recognizing optimum human emotion is a first step towards human and computer symbiosis. As the first step of this research, we conduct a comparative review for a number of technologies and methods for emotion recognition. Specifically, testing the detection accuracy of facial expression recognition of different cloud-services, algorithms, and methods.
Secondly, we study the application of emotion recognition within the areas of e-learning, robotics, and explainable artificial intelligence (XAI). We propose a formal framework that incorporates human emotions into an adaptive e-learning system, to create a more personalized learning experience for higher quality of learning outcomes. In addition, we propose a framework for a co-adaptive Emotional Support Robot. This human-centric framework adopts a reinforced learning approach where the system assesses its own emotional re-actions.

Wrongful convictions have occurred throughout the United States’, but it was not until the creation of the Innocence Project in 1992 that these cases were re-examined. Like other facets of the criminal justice system, racial disparities are present in exoneration research. Studies have found the rate of exoneration is slower for African Americans compared to other races and represent a disproportionate number of rape exonerations relative to their share of the population. Actual compensation is rarely included in analysis, because total compensation awarded has been a black box till now. This is the first study addressing these gaps, by calculating actual compensation for wrongfully convicted sexual assault exonerees and examine racial disparities between awarded compensation. Findings indicate African American exonerees receive significantly more, around $574,657, compared to white exonerees. Implications include evaluating interrogation techniques, updating DNA databases, testing forensic evidence, and calling for states and territories to have compensation statutes.

It is becoming increasingly important for an autonomous system to be able to explain its actions to humans in order to improve trust and enhance human-machine collaboration. However, providing the most appropriate kind of explanations – in terms of length, format, and presentation mode of explanations at the proper time – is critical to enhancing their effectiveness. Explanation entails costs, such as the time it takes to explain and for humans to comprehend and respond. Therefore, the actual improvement in human-system tasks from explanations (if any) is not always obvious, particularly given various forms of uncertainty in knowledge about humans.
In this research, we propose an approach to address this issue. The key idea is to provide a structured framework that allows a system to model and reason about human personality traits as critical elements to guide proper explanation in human and system collaboration. In particular, we focus on the two concerns of modality and amount of explanation in order to optimize the explanation experience and improve overall system-human utility. Our models are based on probabilistic modeling and analysis (PRISM-games) to determine at run time what the most effective explanation under uncertainty is. To demonstrate our approach, we introduce a self-adaptative system called Grid – a virtual game – and the Stock Prediction Engine (SPE), which allows an automated system and a human to collaborate on the game and stock investments. Our evaluation of these exemplars, through simulation, demonstrates that a human subject’s performance and overall human-system utility is improved when considering the psychology of human personality traits in providing explanations.

In this qualitative study, spirituality, and leadership among 15 Black collegiate men enrolled at higher education institutions were examined. The purpose of this phenomenological study was to describe and explore the essence of spirituality within the lived experiences of undergraduate Black men student leaders. The objective was to understand the intersection of spirituality and leadership within Black men, and how it informed their decision making and influenced their career aspirations post their undergraduate collegiate experience. In this study, spirituality is defined as an “internal process of seeking personal authenticity, genuineness, and wholeness as an aspect of identity development” (Love & Talbot, 1999, p. 364).
Guided by descriptive phenomenological methodology, four research questions were asked: (1) What is the meaning of spirituality for Black men student leaders? (2) How do Black men student leaders apply spirituality within their daily leadership practices and behaviors? (3) How do Black men student leaders define the connection between spirituality and leadership development? (4) How does spirituality inform the pathways and career aspirations of Black men student leaders? Four findings emerged as a result of the data analysis: (1) The Spirit and the Struggle: Spirituality Empowers Black Leadership, (2) The Spirit of Black Leadership is Service to Others, (3) Leading from Within: Spirituality is the “Backbone” of Black Men Leadership Identity, and (4) Spirituality Influences Black Men Career Aspirations.

Objective: Our main objectives were to identify cognitive markers of progression to a more severe cognitive diagnosis, explore possible differences between ethnic groups and to correlate cognitive markers of progression with biomarkers of AD (hippocampal and entorhinal volumes) and frontal volumes (lateral orbitofrontal, medial orbitofrontal, superior frontal, and rostral middle frontal volumes). Method: 207 participants (Mage = 71.79, SD = 7.48, 123 Hispanic Americans [HA]) were followed for an average of 23 months. Participants were classified into 3 diagnostic groups (Cognitively normal [CN], mild cognitive impairment [MCI], or dementia) based on the CDR global score and the neuropsychological baseline data was used as predictors of progression status. For the CN group, the Benson Figure delayed recall was a predictor of cognitive decline, and within the MCI group, the Benson delayed recall, the HVLT immediate recall, the TMTB, category fluency, and three measures of the LASSI-L (A1 cued recall, A2 cued recall, and delayed recall) were significant predictors of progression to dementia and are suggested as cognitive markers of progression for MCI individuals. Memory cognitive markers and category fluency correlated with medial temporal lobe volumes, and the TMT-B correlated with superior frontal volume. We did not observe significant differences in cognitive markers across ethnic groups. Conclusion: we identified cognitive markers of progression for CN and for MCI diagnoses which were not different across ethnic groups. These findings contribute to literature on the early identification of individuals at risk of progression to a more severe cognitive status even within asymptomatic individuals which can facilitate a more time- and cost-effective practice that is essential to the provision of the appropriate treatment to those at higher risk of progression.

In this thesis, I explored the abiotic and biotic factors that explain the variation in reproduction, survival, and individual growth of the Florida Apple Snail (Pomacea paludosa), and I combined reproduction, survival, and individual growth to determine the factors limiting Florida Apple Snail populations. First, I examined how the variation in reproduction of the Florida Apple Snail and another non-native congener (P. maculata) can be explained by depth, temperature, photoperiod, and adult densities. I also examined how metaphyton total phosphorus (TP) influenced individual growth rates of both species. I found that P. paludosa optimally reproduce in shallower water than P. maculata, that both species respond positively to increased metaphyton TP, and that P. paludosa respond weaker to variation in metaphtyon TP than P. maculata. Then, I examined individual growth across seasons, and examined how size-dependent survival varied across seasons in and out of the presence predators. I also investigated predators that strongly influence survival rates. I found that individual growth was slower in the dry season than the wet season, that survival was not size-dependent nor seasonal when predators were excluded from cages, and that survival was size-dependent in the dry season but not the wet season when in the presence of predators. Greater Sirens and Giant Water Bugs were found to be strong predators of P. paludosa < 10 mm Shell Length (SL), Greater Siren and Giant Water Bugs seasonal abundances were responsible for the differences in size-dependent survival across seasons. Finally, I incorporated differences in ideal hydrological and temperature conditions for reproduction, seasonal differences in individual growth, and changes in survival in and out of the presence of predators onto a zero-population growth isocline. I found that optimal hydrological and temperature conditions, and increased growth in the dry season, could not make up for losses of snails < 10 mm SL by predators which suggested that predators are limiting P. paludosa populations in our study area.

Dirt, Rust, and Non-Girl Stuff explores identity, mental health, and tradition. Considering the customs of my Cuban heritage, I choose materials and processes that reflect conventions related to gender identity, expression, and craft. These subjects are represented via assemblages that exist as stand-alone sculptures and installations. Each piece is composed of materials and objects chosen based on their physical characteristics and associations to craft or notions of traditional gender norms. The work hints to the viewer through metaphors created by material choice, found object associations, and the placement of each element. Each fragment of material represents a part of my identity. The porcelain acts as a metaphor for my body, often breaking, cracking, and shattering. Its fragility requires mending, stitching, and repair to become something or someone else. The crochet elements reference the women's gender roles and femininity that my parents yearned for me to exhibit. The metal tools and rusted objects are representative of the more masculine roles I took on to fulfill my father's need for a son. The work often exhibits the precarity, the needed repairs, or additions of femininity to the otherwise masculine materials to turn a too masculine body into a more feminine one. The arrangements are not motivated by order or beauty but by the tension caused by the divide between who I am and whom I am expected to be.

This thesis uses an identity studies approach to look at the representation of BIPOC characters within three young adult speculative fiction: The Hunger Games by Suzanne Collins, The Black Witch by Laurie Forest, and Cinder by Marissa Meyer. By incorporating identity studies to explore and analyze examples of misrepresentation and unconscious bias throughout stories centered on oppressive world building, racial hierarchies, this thesis draws upon the works of various scholars including: Stuart Hall, Michel Foucault, Orlando Patterson, Toni Morrison, and Edward Said. A lack of diverse authors and Eurocentrically-framed ideologies cemented into the publishing industry has led to instances of unconscious racialized misrepresentations of BIPOC characters as shown in the of three works of popular young adult fiction demonstrating the constraints created when authors shape and perpetuate identities for others, subjecting them to constructed identities and narratives.