Concept

Creative Problem Solving

Publications associées (172)

Sparse Image Restoration Using Iterated Linear Expansion of Thresholds

We focus on image restoration that consists in regularizing a quadratic data-fidelity term with the standard l1 sparse-enforcing norm. We propose a novel algorithmic approach to solve this optimization problem. Our idea amounts to approximating the result ...

2011

Two-stage column generation

Michel Bierlaire, Matteo Salani, Ilaria Vacca

We introduce a new concept in column generation for handling complex large scale optimization problems, called two-stage column generation, where columns for the compact and extensive formulation are simultaneously generated. The new framework is specifica ...

2010

Optimal Motorway Traffic Flow Control Involving Variable Speed Limits and Ramp Metering

The impact of variable speed limits (VSL) on aggregate traffic flow behaviour on motorways is shown to bear similarities to the impact of ramp metering, in particular, when addressing potentially active bottlenecks. A quantitative model of the VSL impact i ...

INFORMS2010

Constraint-specific recovery networks for solving airline recovery problems

Michel Bierlaire, Matteo Salani, Niklaus Eggenberg

In this paper, we consider the recovery of an airline schedule after an unforeseen event called disruption, making the planned schedule infeasible. We present a modeling framework that allows the consideration of operational constraints within a Column Gen ...

2010

On the Input Acceptance of Transactional Memory

Vincent Gramoli, Pascal Felber

We present the Input Acceptance of Transactional Memory (TM). Despite the large interest for performance of TMs, no existing research work has investigated the impact of solving a conflict that does not need to be solved. Traditional solutions for a TM to ...

World Scientific Publishing2010

Linearly Adjustable International Portfolios

Daniel Kuhn

We present an approach to multi‐stage international portfolio optimization based on the imposition of a linear structure on the recourse decisions. Multiperiod decision problems are traditionally formulated as stochastic programs. Scenario tree based solut ...

American Institute of Physics2010

Task Performance vs. Learning Outcomes: A Study of Tangible User Interface in Classroom Setting

Pierre Dillenbourg, Patrick Jermann, Guillaume Zufferey, Sébastien Cuendet

Tangible User Interfaces (TUIs) offer the potential to facilitate collaborative learning in new ways. This paper presents an empirical study that investigated the effects of a TUE in a classroom setting on task performance and learning outcomes. In the tan ...

Springer2010

Ab initio structure solution by iterative phase-retrieval methods: performance tests on charge flipping and low-density elimination

Thomas Alois Weber

Comprehensive tests on the density-modification methods charge flipping [Oszlanyi & Suto (2004). Acta Cryst. A60, 134-141] and low-density elimination [Shiono & Woolfson (1992). Acta Cryst. A48, 451-456] for solving crystal structures are performed on simu ...

2010

The Robot Vision Track at ImageCLEF 2010

Barbara Caputo, Marco Fornoni

This paper describes the robot vision track that has been proposed to the ImageCLEF 2010 participants. The track addressed the problem of visual place classification, with a special focus on generalization. Participants were asked to classify rooms and are ...

2010

Model-Based Debugging

Salman Mirghasemi

Software Debugging is still one of the most challenging and time consuming aspects of software development. Monitoring the software behavior and finding the causes of this behavior are located at the center of debugging process. Although many tools and tec ...

2009

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