Pixel-Level Deep Multi-Dimensional Embeddings for Homogeneous Multiple Object Tracking

The goal of Multiple Object Tracking (MOT) is to locate multiple objects and keep track of their individual identities and trajectories given a sequence of (video) frames. A popular approach to MOT is tracking by detection consisting of two processing components: detection (identification of objects of interest in individual frames) and data association (connecting data from multiple frames). This work addresses the detection component by introducing a method based on semantic instance segmentation, i.e., assigning labels to all visible pixels such that they are unique among different instances. Modern tracking methods often built around Convolutional Neural Networks (CNNs) and additional, explicitly-defined post-processing steps. This work introduces two detection methods that incorporate multi-dimensional embeddings. We train deep CNNs to produce easily-clusterable embeddings for semantic instance segmentation and to enable object detection through pose estimation. The use of embeddings allows the method to identify per-pixel instance membership for both tasks. Our method specifically targets applications that require long-term tracking of homogeneous targets using a stationary camera. Furthermore, this method was developed and evaluated on a livestock tracking application which presents exceptional challenges that generalized tracking methods are not equipped to solve. This is largely because contemporary datasets for multiple object tracking lack properties that are specific to livestock environments. These include a high degree of visual similarity between targets, complex physical interactions, long-term inter-object occlusions, and a fixed-cardinality set of targets. For the reasons stated above, our method is developed and tested with the livestock application in mind and, specifically, group-housed pigs are evaluated in this work. Our method reliably detects pigs in a group housed environment based on the publicly available dataset with 99% precision and 95% using pose estimation and achieves 80% accuracy when using semantic instance segmentation at 50% IoU threshold. Results demonstrate our method\u27s ability to achieve consistent identification and tracking of group-housed livestock, even in cases where the targets are occluded and despite the fact that they lack uniquely identifying features. The pixel-level embeddings used by the proposed method are thoroughly evaluated in order to demonstrate their properties and behaviors when applied to real data. Adivser: Lance C. Pére

Advances in Primary Progressive Aphasia

Primary progressive aphasia is a clinical syndrome that includes a group of neurodegenerative disorders characterized by progressive language impairment. Our knowledge about this disorder has evolved significantly in recent years. Notably, correlations between clinical findings and pathology have improved, and main clinical, neuroimaging, and genetic features have been described. Furthermore, primary progressive aphasia is a good model for the study of brain–behavior relationships, and has contributed to the knowledge of the neural basis of language functioning. However, there are many open questions remaining. For instance, classification into three variants (non-fluent, semantic, and logopenic) is under debate; further data about epidemiology and natural history of the diseases are needed; and, as in other neurodegenerative disorders, successful therapies are lacking. The Guest Editors expect that this book can be very useful for scholars

Stillborn: The Libidinal Economy of Gadgetized Mediation in the Era of Socialization for Consumption; An Explanatory Political Project

This project captures an attempt to politicize one aspect of Western middle class youth’s everyday experience growing up and living in postindustrial consumer society—the replacement of experiential, material, and libidinal gratification with that of ideological satisfaction. The dissertation takes up problematic adolescent gaming as a site to interrogate the ways and means of technologically-backed consumer socialization, and draw out the implications for subject-formation and possibility of self-determination. Developing new ways to conceptualize politics of youth, the project re-reads existing academic research on youth and gaming. Its main goal is to create a theoretical framework that can sustain an understanding of the importance of consumerizing gadget-mediated self-self cultivation across the dimensions of political economy and its strict materiality, psycho-sociality and its relational concreteness, and the realm of the mind in which ideology meets consciousness. Under the guise of critiquing the banality of gaming studies, the project excavates ideas from various critical theory, phenomenological and psychoanalytic traditions to raise political questions of social reproduction and clarify a concretely political path beyond the present circumstances. I am interested in exploring how it is that generation after generation young people born in the compromised consumption-rendered centers of global capital do not revolt against the seemingly repressive institutions shaping their lives. In this question, there is an intergenerational politics, a politics in which the question of youth and their otherness is crashed into the structuration of political economy and social reproduction within it. This is ultimately the theme of my inquiry. The present work is a study of gaming as a site where we should expect to see the manifestations of this kind of intersection, but instead what we see is a single-minded preference for celebrating the gaming industry and securing the ideologically soothing reproduction. I want to address the politics signaled by the changing role of play in advanced consumer economy, where in the site of gaming, through controlled bursts of traumatization and regularization, prediction of subjective experience is commodified into the global capitalistic circuits

Crafting an outdoor classroom: the nineteenth-century roots of the outdoor education movement

This dissertation examines the antecedents to the outdoor education movement that proliferated in the first decades of the twentieth century, arguing that it stemmed from the Romanticism that emerged in the nineteenth century. Drawing on a Romantic approach to pedagogy, early outdoor educators looked to nineteenth-century literature and art as inspiration for their educational methods, curriculum and marketing. Rejecting the concepts of "rugged individualism," these outdoor educators expressed an ideal of "rugged communalism" where concepts of selflessness, community, and democracy became the lessons learned in the outdoors. The first chapter provides an overview of Puritan understanding of the wilderness and corresponding perspectives on childhood and education by drawing on the writings of John Winthrop, Cotton Mather, and Jonathan Edwards as well as John Bunyan's Pilgrim's Progress and the experience of King Philip's War. The Romantic revolution as expressed by Washington Irving, James Fenimore Cooper and others form the basis of the second chapter. Chapter three charts the transformation of American perspectives on wilderness through the visual arts and literature, specifically those writings of Ralph Waldo Emerson and Nathaniel Hawthorne combined with the work of Thomas Cole. This chapter also explores the White Mountain tourist industry as an expression of these ideals. The fourth chapter follows the changing conceptions of childhood throughout the nineteenth century with a focus on the image of the barefoot boy and street urchins. Chapter five discusses the development of a Transcendental pedagogy through the writings and educational experiments of Ralph Waldo Emerson, Bronson Alcott, Margaret Fuller, Henry David Thoreau, and Louisa May Alcott, including the impact of the Temple School and Brook Farm. The second half of the dissertation addresses specific applications of experiential outdoor pedagogy. This includes the Boston Farm School on Thompson Island, Charlesbank and the playground movement in Boston, the North Bennett Street Industrial School's outdoor programs, the relationship between the Grand Army of the Republic and the Boy Scouts of America, and the impact of Dudley Allen Sargent and Sargent Camp

THE ATTENTION SITUATION: A RHETORICAL THEORY OF ATTENTION FOR MEDIATED COMMUNICATION

What are the available means of attention in a given situation? This dissertation offers a hermeneutic for everyday life that capacitates people to answer this question. The field of communication has long recognized how new technologies challenge our assumptions about how attention operates and how they urge us to reformulate the language we use to think about attention. Rather than provide one attention vocabulary suited to one media environment, this project takes a generative approach that aims to continually refresh our notions about attention at the rate of technological change. To this end, I propose a way of talking about attention as a situational process that must be described pluralistically through a rotation of vocabularies. I offer the “attention situation” as a guiding framework for how interdisciplinary discourses can coherently converge upon any given situation. Then, I illustrate the attention situation framework through a distinctly rhetorical approach to theorizing attention. Paralleling the idea that rhetoric is an architectonic art, attention too is the architecting of material, symbolic, and intentional processes. I illustrate this through many examples from paradigmatic thinkers in media and rhetorical theory. The works of Marshall McLuhan and Kenneth Burke help exemplify how the attention situation can be used to highlight the communication-sourced aspects of attention. From these attention concepts, I formulate “dramatic ecology” as a paradigm of ways that attention is formed within larger socio-technological dialectics, which provides a finer language to assess communicative situations than that of science’s mechanistic behaviorisms. The attention situation, dramatic ecology, and the material-symbolic-intentional dimensions of attention together demonstrate how attention’s cross-disciplinary discourses can be adapted into situational praxis. This rhetorical approach to attention offers a generative toolkit for continually re-theorizing attention through the changes ahead in technology, society, and culture

Advances in knowledge discovery and data mining Part II

19th Pacific-Asia Conference, PAKDD 2015, Ho Chi Minh City, Vietnam, May 19-22, 2015, Proceedings, Part II</p

Tune your brown clustering, please

Brown clustering, an unsupervised hierarchical clustering technique based on ngram mutual information, has proven useful in many NLP applications. However, most uses of Brown clustering employ the same default configuration; the appropriateness of this configuration has gone predominantly unexplored. Accordingly, we present information for practitioners on the behaviour of Brown clustering in order to assist hyper-parametre tuning, in the form of a theoretical model of Brown clustering utility. This model is then evaluated empirically in two sequence labelling tasks over two text types. We explore the dynamic between the input corpus size, chosen number of classes, and quality of the resulting clusters, which has an impact for any approach using Brown clustering. In every scenario that we examine, our results reveal that the values most commonly used for the clustering are sub-optimal