Theses and Dissertations from UMD
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New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM
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Item SYNPLAY: IMPORTING REAL-WORLD DIVERSITY FOR A SYNTHETIC HUMAN DATASET(2024) Yim, Jinsub; Bhattacharyya, Shuvra S.; Electrical Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)In response to the growing demand for large-scale training data, synthetic datasets have emerged as practical solutions. However, existing synthetic datasets often fall short of replicating the richness and diversity of real-world data. Synthetic Playground (SynPlay) is introduced as a new synthetic human dataset that aims to bring out the diversity of human appearance in the real world. In this thesis, We focus on two factors to achieve a level of diversity that has not yet been seen in previous works: i) realistic human motions and poses and ii) multiple camera viewpoints towards human instances. We first use a game engine and its library-provided elementary motions to create games where virtual players can take less-constrained and natural movements while following the game rules (i.e., rule-guided motion design as opposed to detail-guided design). We then augment the elementary motions with real human motions captured with a motion capture device. To render various human appearances in the games from multiple viewpoints, we use seven virtual cameras encompassing the ground and aerial views, capturing abundant aerial-vs-ground and dynamic-vs-static attributes of the scene. Through extensive and carefully-designed experiments, we show that using SynPlay in model training leads to enhanced accuracy over existing synthetic datasets for human detection and segmentation. Moreover, the benefit of SynPlay becomes even greater for tasks in the data-scarce regime, such as few-shot and cross-domain learning tasks. These results clearly demonstrate that SynPlay can be used as an essential dataset with rich attributes of complex human appearances and poses suitable for model pretraining.Item MARKET BEHAVIOR IN THE POST-TRANSITIONAL NARRATIVE OF RAFAEL CHIRBES AND BELÉN GOPEGUI(2018) Giller-Wilde, Anne; Naharro-Calderon, Jose Maria; Spanish Language and Literature; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)This dissertation attempts to identify pertinent literary strategies found in the Spanish capitalist contemporary narrative. Having traced patterns like the stock market’s pendular movements in the Spanish post-Franco Transitional narrative of Rafael Chirbes and Belén Gopegui, this thesis considers similar thematic and stylistic repetitions deriving from the 19th Century Spanish Realist and Naturalist Novel and the Post-War period of the Civil War (1939-1975), characteristics which manifest themselves cumulatively in the novels of Chirbes and Goegui. Taking into account economic and market theories, and borrowing R.N. Elliott’s wave theory terminology for charting of market data and analysis of numerical data over time, the thesis considers qualitative literary fluctuations analogous to the temporal structures of stock market prices which occur through the history of trading. Due to differing experiences in the aforementioned periods, male and female authorship are considered separately in the two periods anterior to the post-Franco Transition. The dissertation also relies on theories of memory, history and group psychology, concepts close to formulations found in theories such as those of Prechter, Frost, Ortega y Gasset, Ricoeur, etc. It proposes that the novels of Chirbes and Gopegui, because of their discernible temporally ascending intertextual articulation, are analogous to the fifth wave of Elliott’s five-wave market cycle, which he termed social movement and whose momentum was stimulated by collective social emotion or Prechter’s social mood. In Chirbes and Gopegui, the underlying social mood is one of indignation and resentment whose manifestation can be traced from the late 19th-Century, to the Post-War period under the dictator Francisco Franco, culminating in the Post-Transitional novel, in which a generational rift rooted in socio-economic inequality is indicative of the unhealed wounds from the Spanish Civil War. The novels from the three time periods are also of an economic nature, treating human engagement with money and its consequences. Chirbes’ and Gopegui’s protagonists are theoretically a return to the universal protagonist in the novels of Benito Pérez Galdós, but who embody the socio-economic concerns of the 21st Century, completing a literary social movement.Item Internalist Deflationism: On the Limits of Ontological Investigation(2015) Vogel, Christopher A.; Pietroski, Paul M; Philosophy; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)Since Frege(1879), the history of semantics identifies the meanings of natural language expressions with the mind external things they denote, be they pedestrian objects (e.g., cows and chairs), less pedestrian objects (e.g. mereological sums), or abstracta (e.g., sets of possible worlds). For the Quinean Realist, a language with such a semantics is fruitful for ontological investigation, insofar as analyzing the denotational meanings of (the constituents of) sentences in that language reveals which objects populate the (external) worldly domain. However, consigning meaning over to truth in this manner comes at a cost. The externalist thesis is only had by sacrificing the explanatory adequacy of our theory of meaning. Three arguments suggest this: first, facts about the rapid human acquisition of natural language suggests that languages are internal to the human mind, as an innate module in cognitive architecture; second, naturalist commitments suggest that there is no sui generis, mind-independent kind `word' to stand in the word-to-world relations posited by the externalist; third, natural languages exhibit lexical flexibility, as manifest in the distribution of natural language speaker judgments, and this property cannot be easily explained by an externalist semantics. The Realist might respond to these arguments by appealing to the languages utilized to express our best scientific theories, using those invented languages as ontological guides. Since these scientific languages are constructed with the expressed purpose of perspicuously describing reality, the Realist could contend that expressions in those languages have an externalist semantics. I argue, using examples from evolutionary biology, that scientific languages exhibit lexical flexibility as well, casting doubt on the claim that these languages have meanings that admit to externalist treatment. The Realist then should reject the metaphysical methodology which assumes the externalist thesis that the meaning of a linguistic expression determines its truth-conditions.Item Structuralism and Natural Philosophy: Method, Metaphysics and Explanation(2009) Cifone, Michael Christian; Bub, Jeffrey; Philosophy; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)This dissertation is an examination of the foundations of what I call a "fourth" tradition of analytical-scientific philosophy, the tradition of "structuralism". It is a disavowal of a metaphysics of substances and/or entities in the pursuit of scientific theory and truth. We look, in particular, at the current manifestation of this tradition, which advances the thesis of "structural realism"; we ask how tenable this thesis is, and whether we can weaken it. I argue that we should focus on methodology--a program for the formulation of scientific hypotheses about the sorts of things there are--rather than on metaphysics per se. We replace "substance" with "relation" as the basic ontic posit, and hold that substances or entities are metaphysically derivative from relational structure. Thus, the thesis is not that "there are no things" (or that "everything must go", as Ladyman et al. suppose); rather, the thesis is that the things (entities or substances) are relational structure, and there is no complete specification of an independent entity that is not itself more relational structure (so a metaphysics of substances is merely secondary to that of relational structure). I also suggest that there is no complete, unitary or monistic theory of what `structure' itself is. That is, I hold that there is no "total" structure of which everything that is relational structure is a "part", on the grounds that this would constitute an "illegitimate totality" in Russell's sense (the claim that "everything is structural" does not mean that there is a single structure which everything has--what a monistic theory of structure seems to demand). We then turn to the question of scientific explanation in light of structural realism: can there be explanation without a metaphysics of substances? I answer affirmatively. I then turn to two cases where, I argue, structuralism (and the specific thesis of structural realism) is in play regarding scientific explanation: quantum information theory, and the recent attempt to render quantum mechanics local by re-interpreting physical law time symmetrically. I conclude with a consideration of some objections to structuralism, and an articulation of the general view of metaphysics that structuralism seems to presuppose.Item Inheriting Fear: A Collection of Short Stories(2008-05-05) Snider, Jeffrey; Lewis, William H; English Language and Literature; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)Inheriting Fear is a collection of fictional short stories that examines several subjects and themes, including identity; concepts of community; adoption; religion; familial responsibilities regarding aging, gender, tradition and generational conflicts; and, social and political violence, racism, classicism and suppression, particularly involving American Indian characters and culture. Settings include suburbia, a West Virginia coal mine, Senegal and watermen communities on Chesapeake Bay. Many of the stories investigate the art of storytelling and how that art is integrated into everyday lives and history.