Orange S.A.

About: Orange S.A. is a company organization based out in Paris, France. It is known for research contribution in the topics: Terminal (electronics) & Signal. The organization has 6735 authors who have published 9190 publications receiving 156440 citations. The organization is also known as: Orange SA & France Télécom.

Electron and hole capture in multiple-quantum-well structures.

Abstract: We have studied a series of modified GaAs/${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As multiple-quantum-well structures, where increased capture times are obtained owing to the engineering of the band configuration. Both electron and hole capture times have been measured as a function of well width. Hole capture times are fast (typically 10 ps) and depend weakly on the structure. Electron capture times are shown to vary between 2 and 120 ps for well widths covering the whole range between 30 and 100 \AA{}. This variation and the short time observed at resonance, when the barrier and the well levels are separated by 1 LO-phonon energy, demonstrate the importance of quantum-mechanical electron capture processes.

MOBIUS: mobility, ubiquity, security objectives and progress report

Abstract: Through their global, uniform provision of services and their distributed nature, global computers have the potential to profoundly enhance our daily life. However, they will not realize their full potential, unless the necessary levels of trust and security can be guaranteed. The goal of the MOBIUS project is to develop a Proof Carrying Code architecture to secure global computers that consist of Java-enabled mobile devices. In this progress report, we detail its objectives and provide a snapshot of the project results during its first year of activity.

Fault tolerance for highly available internet services: concepts, approaches, and issues

Abstract: Fault-tolerant frameworks provide highly available services by means of fault detection and fault recovery mechanisms. These frameworks need to meet different constraints related to the fault model strength, performance, and resource consumption. One of the factors that led to this work is the observation that current fault-tolerant frameworks are not always adapted to existing Internet services. In fact, most of the proposed frameworks are not transport-level- or session-level-aware, although the concerned services range from regular services like HTTP and FTP to more recent Internet services such as multimodal conferencing and voice over IP. In this work we give a comprehensive overview of fault tolerance concepts, approaches, and issues. We show how the redundancy of application servers can be invested to ensure efficient failover of Internet services when the legitimate processing server goes down.

Searching for compact algorithms: CGEN

Abstract: In this paper we describe an aes-like pseudo-random number generator called cgen Initial estimates suggest that the computational resources required for its implementation are sufficiently modest for it be suitable for use in RFID tags

Computing optimal max-min fair resource allocation for elastic flows

Abstract: In this paper, we consider the max-min fair resource allocation problem as applied to elastic flows. We are interested in computing the optimal max-min fair rate allocation. The proposed approach is a linear programming based one and allows the computation of optimal routing paths with regard to max-min fairness, in stable and known traffic conditions. We consider non-bounded access rates, but we show how the proposed approach can handle the case of upper-bounded access rates. A proof of optimality and some computational results are also presented