Theses - Media Arts and Sciences https://hdl.handle.net/1721.1/7614 Tue, 22 Dec 2020 04:29:59 GMT 2020-12-22T04:29:59Z All photons imaging : time-resolved computational imaging through scattering for vehicles and medical applications with probabilistic and data-driven algorithms https://hdl.handle.net/1721.1/128597 All photons imaging : time-resolved computational imaging through scattering for vehicles and medical applications with probabilistic and data-driven algorithms Satat, Guy. One of the greatest challenges in computational imaging is scaling it to work outside the lab. The main reasons for that challenge are the strong dependency on precise calibration, accurate physical models, and long acquisition times. These prevent practical progress towards medical imaging and seeing through occlusions such as fog in the wild. This dissertation demonstrates that with data-driven and probabilistic modeling we can alleviate these dependencies, and pave the way towards real-world time-resolved computational imaging through extreme scattering conditions using visible light. The ability to image through scattering media in the visible part of the electromagnetic spectrum holds many applications in various industries. For example, seeing through fog would enable autonomous robots to operate in challenging weather conditions; augment human driving; and allow airplanes, helicopters, and drones to take off and land in dense fog conditions.; In medical imaging, the ability to see into the body with near-infrared light would reduce the exposure to ionizing radiation and provide more clinically meaningful data. In order to image in diverse and extreme scattering conditions, we develop novel algorithms inspired by techniques in signal processing, optimization, statistical analysis, compressive sensing, and machine learning that leverage time-resolved sensing. More specifically, we demonstrate techniques that computationally leverage all of the optical signal, including scattered light, as opposed to locking onto a specific part of the optical signal. Furthermore, we show that by introducing probabilistic formulation to the imaging problem, the resulting system does not require user input for calibration and priors; this makes our systems more practical for real-world scenarios and enables them to operate in a wide range of scattering conditions.; We consider four cases of imaging through scattering media with increasing complexity: 1. A theoretical analysis of time-resolved single pixel imaging, which demonstrates scene reconstruction even when the entire scene is measured with a single pixel, an equivalent of simple scattering or a blur that is easy to model. 2. A data-driven calibration invariant technique for imaging through simple scattering (a sheet of paper). 3. Imaging through a thick tissue phantom by utilizing all of the optical signal with minimal assumptions on the tissue properties. 4. Imaging through a wide range of dense, dynamic, and heterogeneous fog conditions. In that case, we introduce a probabilistic model that is able to recover the occluded target reflectance and depth without any assumption about the fog. Thesis: Ph. D., Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2019; Cataloged from the official PDF of thesis.; Includes bibliographical references (pages 199-214). Tue, 01 Jan 2019 00:00:00 GMT https://hdl.handle.net/1721.1/128597 2019-01-01T00:00:00Z Gut-brain computer interfacing (GBCI) : wearable electrogastrography for emotion regulation https://hdl.handle.net/1721.1/128596 Gut-brain computer interfacing (GBCI) : wearable electrogastrography for emotion regulation Vujic, Angela(Angela V.) Sound decision making relies on emotional markers created in the body when deliberating action; according to the Somatic Marker hypothesis, this process is compromised under strong and incongruous emotional states. At the same time, "gut feelings" are rooted in neuroanatomical evidence of gut-brain crosstalk. I hypothesize we could measure "gut" biosignals to help individuals regulate emotions and enhance decision-making. However, this work has not been explored in human-computer interaction (HCI). In this thesis I motivate, define and design gut-brain computer interfacing (GBCI). I define GBCIs to be interfaces that measure gut-brain activity and establish communication between the gut-brain and an external device. This thesis investigates GBCI as a closed-loop biofeedback interface for enhancing higher order cognitive functions. In specific, a GBCI for emotion regulation.; I've chosen to define and investigate GBCIs based on the Somatic Marker Hypothesis, neuroanatomical links between the enteric nervous system (ENS) and emotional processing regions of the brain, and the lack of research in gut-brain physiological computing. I designed and implemented Serosa, a non-invasive wearable interface that records gastric slow waves through electrogastrography (EGG) and provides haptic, visual or auditory biofeedback. Through three versions of Serosa, I investigated the core components of a GBCI: signal acquisition, signal processing, and feedback and output. My studies with Serosa demonstrate how EGG correlates with emotional stimuli and the usability of an EGG-based GBCI in a real-time physiological regulation intervention. Based on these results, I provide guidelines for how to implement an EGG-based GBCI. I also describe potential applications and future directions to expand upon the work. The gut-brain is not well studied compared to the brain.; In addition to creating a new area for HCI, we may also contribute new data and understandings of the relationship between higher order cognitive functions and the ENS. Ultimately, I envision GBCI showing how we can enhance cognition starting within the body versus starting within the brain. Thesis: S.M., Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2019; Cataloged from PDF of thesis. "Missing pages 39-40"--Disclaimer page.; Includes bibliographical references (pages 78-81). Tue, 01 Jan 2019 00:00:00 GMT https://hdl.handle.net/1721.1/128596 2019-01-01T00:00:00Z Kicks x cliques : exploring the intersection of sneaker culture and mental health in the Black community https://hdl.handle.net/1721.1/128595 Kicks x cliques : exploring the intersection of sneaker culture and mental health in the Black community Johnson, Britney(Britney L.) Mental health is an issue affecting a wide range of people, yet treatment and engagement levels for various multicultural groups are particularly low. With the United States becoming more diverse, there exists a need for more inclusive approaches to engagement. This thesis explores how a culturally relevant approach to mental health may impact conversations relating to the topic of Black mental health. With the prominence and cultural significance of sneakers, this work seeks to highlight its influence on destigmatizing mental health in the Black community. The methodology of this research is presented in three phases: rapid ethnography, a footwear design workshop, and a social media campaign. With each phase influencing the direction of the research, we utilized the results of the social media campaign to measure its impact on #blackmentalhealth conversations on Twitter. Several tweets relating to Black mental health were gathered from the platform to be evaluated using sentiment analysis techniques. This evaluation presented how the sentiments shared during the social media campaign contributed positively to the discussion on the platform. The perspective of sneakers provided more personal narratives of mental health that extended beyond inspiration quotes and mental health events. It is our hope that this work motivates others to consider the importance of cultural inclusion when pursuing various methods of engagement - whether in relation to mental health or other important issues. Thesis: S.M., Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2019; Cataloged from PDF of thesis. "The Table of Contents does not accurately represent the page numbering"--Disclaimer page.; Includes bibliographical references (pages 75-79). Tue, 01 Jan 2019 00:00:00 GMT https://hdl.handle.net/1721.1/128595 2019-01-01T00:00:00Z Freedom simulator https://hdl.handle.net/1721.1/128594 Freedom simulator Lee, Hane,S.M.Massachusetts Institute of Technology. While freedom is an integral part of modern American citizenship and culture, it is always studied as an objective measure. This thesis aims to understand freedom as a subjective sensation and build a set of interactive experiences that evoke a sensation of freedom. Starting from principles of freedom, sensation and experience, and subjectivity, this thesis deduces expressive elements of space and time, agency, and limitation to translate the principles into experiential reality. The final product of this thesis is a design for a set of three experiences, two of which were implemented. Each experience is based on a contrasting, modern concept of freedom and utilizes various techniques such as spatial audio, motion tracking, and real-time video projection. These experiences question the importance of freedom for each individual user. Thesis: S.M., Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2019; Cataloged from PDF of thesis. "The Table of Contents does not accurately represent the page numbering"--Disclaimer.; Includes bibliographical references. Tue, 01 Jan 2019 00:00:00 GMT https://hdl.handle.net/1721.1/128594 2019-01-01T00:00:00Z 狠狠躁天天躁中文字幕_日韩欧美亚洲综合久久_漂亮人妻被中出中文字幕