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RISS 인기검색어
- 검색키워드
- 저자 : de Leo, Francesco (검색결과 5 건)
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Human motivated multicamera video analytics
De Leo, Carter University of California, Santa Barbara 2013 해외박사(DDOD)
The continued emergence of inexpensive sensors and storage has made the collection and processing of large quantities of visual data practical, opening up new possibilities in data exploitation and understanding. The volume of data also makes it increasingly difficult to rely solely on humans for review, requiring assistance from automated systems to use large data sources to their full potential. However, while large data has also enabled new algorithmic techniques, computer performance still lags behind that of humans. The work in this thesis addresses both sides of this problem by exploring both how automated systems can make the most of large data and how they can be refined to act more human when doing so. I will discuss video summarization as applied to a network of 11 cameras and show how our system makes the network data more accessible to human operators while also using human feedback to guide its design. A novel approach to object tracking that uses large-scale human annotation to implicitly apply human scene understanding in an automated system will also be discussed. Finally, I will present recent work in using functional magnetic resonance imaging (fMRI) to explore how quantitative human feedback can be directly collected from a subject and applied to debugging traditional computer vision algorithms to bring them closer to human capabilities.
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de Leo, Francesco The George Washington University 2009 해외공개박사
Knowledge management (KM) has become an increasingly important aspect for achieving and maintaining competitive advantage across all types of organizations and businesses worldwide. However only limited research is available to understand how KM may be influenced by national culture. This research focuses on the differences and similarities between Italian and American workers' beliefs, expectations, and practices of knowledge management and how these relate to Hofstede's national culture dimensions. This study is part of a multi-country set of research studies, undertaken by The George Washington University's Institute for Knowledge and Innovation, aimed at understanding how KM may be influenced by national culture. For continuity and comparative purposes we replicate a previous study, which compared KM perceptions between American and Taiwanese knowledge workers (Wang 2004). The subjects of our study are Italian and American employees and managers expected to be involved in KM activities at all levels. Statistical comparisons on the 474 study participants (237 from each country) do not show statistically significant differences between Italian and American perceptions of knowledge management beliefs, expectations and practices. Both countries gave a relatively high importance score to all factors believed to contribute to successful knowledge management initiatives. Similarly consensus was found on the expected benefits such initiatives bring to an organization. Comparably lower scores were recorded on the actual implementation of KM best-practices by the participants' organizations. For individual variables within our constructs where differences are observed between the two countries, we propose empirical evidence that high uncertainty avoidance traits of the Italian society may explain such differences. This research provides insights which will help companies or units within a company select KM tools and practices that are more likely to succeed in the national culture setting in which these are to be implemented.
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Equilibrium properties of polymer solutions near surfaces: Monte Carlo simulations
de Joannis, Jason Leo University of Florida 2000 해외박사(DDOD)
Knowledge of conformational features of polymer solutions at interfaces is a prerequisite for understanding and controlling important technological processes such as colloid stabilization, biopolymer adsorption, corrosion inhibition, lubrication, adhesion, membrane separations and aggregation-induced separations. In this exposition, some examples are shown of the unique contributions that a carefully designed simulation study can make towards an improved interpretation of experimental and theoretical work. One section is devoted towards the improvement of an existing Monte Carlo algorithm to enable better tests of theoretical results. Large-scale end-swapping configurational bias moves provide the best chance of simulating high chain lengths and concentrations. The main focus of this paper is on polymers adsorbing from a good solvent onto a solid surface that has a weak (reversible) attraction on monomers. We analyze the concentration gradient that develops when the interface is in equilibrium with a bulk solution, and the force induced by adsorbed chains when subject to confinement. Strong evidence is presented supporting the scaling prediction for long chains that the loop and overall concentration decay as <italic>z</italic><super> −4/3</super> when adsorption occurs from semi-dilute or dilute athermal solutions. Mean-field theories predict a concentration decay that is too rapid at all chain lengths, consequently they underestimate adsorbed amount and layer thickness. Simulations provide the only quantitative description of finite-length random walks with excluded volume subject to adsorption conditions. Adsorbed chains under compression exhibit lower pressures than predicted by mean-field theory as a result of its lower adsorption capacity. Even when interpreted with respect scaled variables, quantitative discrepancies persist in the compression of saturated/semidilute layers. A different comparison shows that the simulation results presented have substantial experimental implications. The compression of two adsorbed layers against each other is quantitatively similar to the compression of a single layer, when the surfaces bear high adsorbed amounts. A study also is made of the concentration gradient and confinement energy of a single chain between athermal walls. It is found that good agreement exists with theoretical predictions based on the “magnetic analogy” for a universal correlation between compression force and the depletion of segments near the walls. Finally several remarks are made concerning further research on problems including polymer depletion at interfaces and adsorption of polymers from a bidisperse distribution of molecular weight.
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