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Ph.D de

Ph.D
Group : Learning and Optimization

Portfolio methods in uncertain contexts

Starts on 14/03/2013
Advisor : TEYTAUD, Olivier

Funding :
Affiliation : Université Paris-Saclay
Laboratory : LRI-TAO

Defended on 11/12/2015, committee :
Directeurs de thèse :
M. Olivier Teytaud, INRIA Saclay
M. Marc Schoenauer, INRIA Saclay

Rapporteurs :
M. Bruno Bouzy, Université Paris Descartes

Examinateurs :
M. Philippe Dague, Université Paris-Saclay
M. Simon Lucas, University of Essex
M. Petr Posik, Gerstner Laboratory
M. Günter Rudolph, University of Dortmund

Research activities :

Abstract :
The energy investments are difficult because of uncertainties. Some uncertainties can be modeled by the probabilities. But there are difficult issues such as the evolution of technology and the penalization of CO2, which can not be presented by probabilities. Also, in the traditional optimization of energy systems, disappointingly, the noise is often badly treated by deterministic management. This thesis focuses on applying noisy optimization to energy systems. This thesis concentrates in studying methods to handle noise, including using of resampling methods to improve the convergence rates; applying portfolio methods to noisy optimization in the continuous domain; applying portfolio methods to the energy investments and games, including the use of adversarial bandit algorithms to calculate the Nash equilibrium of two-player zero-sum matrix game and the use of "sparsity" to accelerate the computation of Nash equilibrium.

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MICRO VISUALIZATIONS: DESIGN AND ANALYSIS OF VISUALIZATIONS FOR SMALL DISPLAY SPACES
The topic of this habilitation is the study of very small data visualizations, micro visualizations, in display contexts that can only dedicate minimal rendering space for data representations. For several years, together with my collaborators, I have been studying human perception, interaction, and analysis with micro visualizations in multiple contexts. In this document I bring together three of my research streams related to micro visualizations: data glyphs, where my joint research focused on studying the perception of small-multiple micro visualizations, word-scale visualizations, where my joint research focused on small visualizations embedded in text-documents, and small mobile data visualizations for smartwatches or fitness trackers. I consider these types of small visualizations together under the umbrella term ``micro visualizations.'' Micro visualizations are useful in multiple visualization contexts and I have been working towards a better understanding of the complexities involved in designing and using micro visualizations. Here, I define the term micro visualization, summarize my own and other past research and design guidelines and outline several design spaces for different types of micro visualizations based on some of the work I was involved in since my PhD.