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.

Reusable MDA components: a testing-for-trust approach

Abstract: Making model transformations trustable is an obvious target for model-driven development since they impact on the design process reliability Ideally, model transformations should be designed and tested so that they may be used and reused safely as MDA components We present a method for building trustable MDA components We first define the notion of MDA component as composed of its specification, one implementation and a set of associated test cases The testing-for-trust approach checks the consistency between these three facets using the mutation analysis It points out the lack of efficiency of the tests and the lack of precision of the specification The mutation analysis thus gives a rate that evaluates: the level of consistency between the component's facets and the level of trust we can have in a component Relying on this estimation of the component trustability, developers can consciously trade reliability for resources

Ergodic Control and Polyhedral Approaches to PageRank Optimization

Abstract: We study a general class of PageRank optimization problems which involve finding an optimal outlink strategy for a web site subject to design constraints. We consider both a continuous problem, in which one can choose the intensity of a link, and a discrete one, in which in each page, there are obligatory links, facultative links and forbidden links. We show that the continuous problem, as well as its discrete variant when there are no constraints coupling different pages, can both be modeled by constrained Markov decision processes with ergodic reward, in which the webmaster determines the transition probabilities of websurfers. Although the number of actions turns out to be exponential, we show that an associated polytope of transition measures has a concise representation, from which we deduce that the continuous problem is solvable in polynomial time, and that the same is true for the discrete problem when there are no coupling constraints. We also provide efficient algorithms, adapted to very large networks. Then, we investigate the qualitative features of optimal outlink strategies, and identify in particular assumptions under which there exists a “master” page to which all controlled pages should point. We report numerical results on fragments of the real web graph.

Method and system to recommend applications from an application market place to a new device

Abstract: The invention relates to a method and system for populating a second electronic device of a user with applications from a second application platform said second electronic device is operating with, using applications installed on a first electronic device of said user, said first electronic device operating with a first application platform, the method being carried out by a n application recommendation node and comprising the acts of receiving for each application of at least a first and second application platforms metadata characterizing said application, said application being arranged to perform one or more functions when running on an electronic device, linking in an application database an application from the first application platform with a n application from the second application platform, using a similarity criterion a pplied to the received metadata and measuring similarities among application functions, determining from a second electronic device registered for a same user the application platform said second electronic device is operating with, receiving first metadata describing one or more first applications hosted by a first electronic device registered for the same user, said first electronic device operating with a first application store, retrieving from the application database one or more second applications from the second application platform and linked with the one or more first applications, providing to the second electronic device a list of applications from the second application platform, said list comprising the one or more retrieved second applications.

Process and device for blind equalization of the effects of a transmission channel on a digital speech signal

Abstract: A process and device for blind equalization of the effects of a transmission channel on a speech signal. The speech signal is transformed into cepstral vectors which are representative of the speech signal over a given horizon. A reference cepstrum consisting of a constant cepstrum signal representative of the long-term cepstrum of the speech signal is calculated for each cepstral vector. Each of the cepstral vectors is subjected to adaptive filtering by LMS on the basis of the reference cepstrum so as to generate a set of equalized cepstral vectors on the basis of the calculation of an error signal between the reference cepstrum and equalized cepstral vectors. The error signal is expressed as the difference between the reference cepstrum component of a given rank and the component of the same rank of the equalized cepstral vector.