Thesis (Ph. D.)--University of Missouri-Columbia, 2001. / Typescript. Vita. Includes bibliographical references (leaves 157-169). Also available on the Internet.

Thesis (Ph. D.)--University of Missouri-Columbia, 2001. / Typescript. Vita. Includes bibliographical references (leaves 157-169). Also available on the Internet.

Automatic analysis of conversations is important for extracting high-level descriptions of meetings. In this work, as an alternative to linguistic approaches, we develop a novel, purely bottom-up representation, constructed from both audio and video signals that help us char- acterize and build a rich description of the content at multiple temporal scales. Nonverbal communication plays an important role in describing information about the communication and the nature of the conversation. We consider simple audio and video features to extract these changes in conversation. In order to detect these changes, we consider the evolution of the detected change, using the Bayesian Information Criterion (BIC) at multiple temporal scales to build an audio-visual change scale-space. Peaks detected in this representation yields group turn based conversational changes at dierent temporal scales. We use the NIST Meeting Room corpus to test our approach. Four clips of eight minutes are extracted from this corpus at random, and the other ten are extracted after 90 seconds of the start of the entire video in the corpus. A single microphone and a single camera are used from the dataset. The group turns detected in this test gave an overall detection result, when compared with dierent thresholds with xed group turn scale range, of 82%, and a best result of 91% for a single video. Conversation overlaps, changes and their inferred models oer an intermediate-level de- scription of meeting videos that are useful in summarization and indexing of meetings. Since the proposed solutions are computationally e cient, require no training and use little domain knowledge, they can be easily added as a feature to other multimedia analysis techniques.

Many Canadian cities are collectively considering pedestrians, cyclists, public transit, automobiles, and the movement of goods through complete streets, aspiring to enable all people, regardless of age, income, abilities, or lifestyle choices to use streets. Canadian municipal transportation practices are largely based on conventional approaches, where the movement of motor vehicles is a priority. The purpose of this practicum is to identify ways that selected precedents from Canadian and European municipal practices, may inform Canadian municipalities as they seek to incorporate the needs of pedestrians and cyclists – encompassing city planning, transportation engineering, architecture, and urban design considerations. The results of this research exemplify the interdisciplinary involvement required for creating streets as both links and places. Recommendations for Canadian municipalities include aligning municipal design practices with complete streets practices and incorporating interdisciplinary inputs in street design. Ensuring an interdisciplinary university education is recommended for street design professions. / October 2015

Inter-turbine burners are useful devices for increasing engine power. To reduce the size of these combustion devices, ultra-compact combustor (UCC) concepts are necessary. One such UCC concept is the centrifugal-force based high-g combustor design. Here, a model ultra-compact combustor (UCC) with fuel spray injection is simulated using large eddy simulation (LES) and Reynolds-Averaged Navier-Stokes (RANS) methodologies to understand mixing and spray dispersion inside centrifugal-based combustion systems. Both non-evaporating and evaporating droplet simulations were carried, as well as the tracking of a passive scalar, to explore this multiphase system. Simulation results show that mixing of fuel and oxidizer is based on a jet-in-crossflow system, with the fuel jet issuing into a circulating oxidizer flow stream. It is seen that a a high velocity vortex-like ring develops in the inner core of the combustor, which has enough momentum to obstruct the path of combustion products. There is minimal fuel droplet and vapor segregation inside the combustor and enhanced turbulent mixing is seen at mid-radius. / text

Intelligence testing has had a relatively long and controversial history, beginning with what is generally considered the first formal measure of intelligence, the Binet-Simon Scales (1916). Questions regarding possible cultural bias in these measures arose virtually simultaneously (e.g. Burt, 1921; Stern, 1914). Over the course of the twentieth and early twenty-first centuries, an abundance of intelligence measures have been developed, with many of them having several revisions, but the issue of test bias remains an important one, both in the professional literature and in the popular press (Reynolds & Lowe, 2009). A current intelligence measure in use, the Differential Ability Scales, Second Edition (DAS-II, Elliott, 2007), is a test with growing popularity for assessment of children and youth, not only for its ease of use, but also for its appeal to young children and its nonverbal composite (among other things). Consequently, it is essential that there be empirical evidence supporting the use of the DAS-II as an appropriate measure of cognitive abilities for children of varying backgrounds. The test publishers conducted extensive research with a representative sample during test development in an effort to ensure that the measure met adequate reliability and validity criteria; however, the issue of test bias, particularly regarding cultural or racial/ethnic groups, was not explicitly addressed. This issue was raised and examined with the original DAS by Keith, Quirk, Schartzer, and Elliott (1999), but with the significant changes made from the first edition to the second, there is no guaranty that the evidence from the earlier would necessarily apply to the latter. The current study investigated whether the DAS-II demonstrates systematic construct bias toward children and youth of any of four ethnic groups: Black, Hispanic, Asian, and White. Multi-group confirmatory factor analysis using data from the DAS-II standardization sample was used to assess whether criteria for increasingly strict levels of invariance were met across groups. Outcomes of this research contribute to an existing body of literature on test bias, as well as provide evidence regarding cross-group construct validity in the DAS-II. Ultimately the results of this study can be used to evaluate the appropriateness of the DAS-II for clinical use with certain ethnic groups and will help to emphasize further the importance of exploring these issues with all standardized tests. / text

Juvenile violence is a phenomenon that consistently garners great attention in the media, the public, and across a multitude of academic disciplines. A growing body of literature in developmental and lifecourse criminology has called for innovative research to further investigate the causes and correlates of serious juvenile offenders. Toward this end, the present study uses prospective, longitudinal data from the Pittsburgh Youth Study (PYS) to gauge the temporal impact of childhood and adolescent mental health problems on the development of serious offending behaviors in boys. Borrowing largely from the work of Achenbach and colleagues (2001), data from parent and teacher reports of psychopathological problems were used to create DSM-oriented scales for Oppositional Defiant, Attention-Deficit/Hyperactivity, Anxiety, and Affective Problems. These scales offer a more continuous form of measurement than DSM diagnoses and allowed for distinctions between normal, borderline, and clinical levels of mental health problems. Forward-step logistic regression analyses indicated that three different teacher-reported DSM-oriented mental health problems emerged at three different stages of development as significant predictors of serious violence over the lifecourse. The significant substantive, methodological, and public policy implications of the study are discussed.

Not available / text

Scale deposition, either in the formation or inside the tubing, is a serious problem that can affect the productivity of oil fields. Production sustainability depends on the successful implementation of scale management strategies prior to developing new fields. Such strategies should involve tools capable of addressing the risks of developing scales during the production stage as well as determining the outcomes of possible remediation jobs in the future. UTCHEM, a multi-compositional flow model, was used in this work to present a comprehensive study that includes both precipitation and remediation scenarios. Although there are different mechanisms prompting the deposition of mineral scales, barite and calcite were selected primarily to simulate the effect of mixing incompatible water compositions; an issue that is usually associated with seawater injection. Equilibrium state calculations were carried out using a geochemical model (EQBATCH) to verify the incompatibility of the injection water with the formation water. In this work, we show the evolution, distribution, and remediation of solids over time for several hypothetical cases. The quantity of deposits in the near-wellbore region was found to be less at a highly heterogeneous reservoir model in contrast to the amount precipitated in homogenous reservoirs. This could be critical to wells productivity in the long-run since much of the drop in reservoir pressure occurs near the wellbore. The predictive ability of UTCHEM was extended to include simulating the removal of carbonate scales using a chelating chemical. The optimization of the injected treatment can be achieved mechanically through adjusting the well spacing (during the initial stages of field development) or through adjusting the concentrations of active components in the remediation fluids. The model provides a valuable tool that helps planners to predict scaling-related issues ahead of time, and subsequently to determine the economic viability of the project. This work serves as an opportunity to re-assess this simulator and allows for further work to enhance its capabilities. / text

published_or_final_version / Education / Master / Master of Education