Free/Libre Open Source Software

Résumé

vignette|320x320px|Capture d'écran d'un bureau avec de multiples logiciels open-source en cours d'exécution: VLC, Firefox, LibreOffice Writer, GIMP, etc. Free and open-source software (F/OSS, FOSS) ou free/libre/open-source software (FLOSS) sont des expressions inclusives, rassemblant à la fois les logiciels libres et les logiciels à code source ouvert, qui malgré des cultures et des philosophies divergentes ont des modèles de développement logiciel similaires. Ces expressions permettent de désigner globalement le type particulier de logiciels produits par ce modèle de développement logiciel spécifique (par opposition aux modèles des logiciels propriétaires), en mettant de côté les divergences philosophiques qui existent au sein de ce courant (le mouvement original du logiciel libre insistant davantage sur le concept de liberté, au sens philosophique et socio-politique, tandis que le mouvement des logiciels à code source ouvert s'est différencié de son parent en insistant plus sur l'as

Source officielle

https://fr.wikipedia.org/wiki/Free/Libre_Open_Source_Software

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QUIC: Opportunities and threats in SATCOM

Ludovic Bernard Gérard Thomas

This article proposes a discussion on the strengths, weaknesses, opportunities and threats related to the deployment of QUIC end-to-end from a satellite-operator point-of-view. The deployment of QUIC is an opportunity for improving the quality of experience when exploiting satellite broadband accesses. Indeed, the fast establishment of secured connections reduces the short files transmission time. Moreover, removing transport layer performance enhancing proxies reduces the cost of network infrastructures and improves the integration of satellite systems. However, the congestion and flow controls at end points are not always suitable for satellite communications due to the intrinsic high bandwidth-delay product. Further acceptance of QUIC in satellite systems would be guaranteed if its performance in specific use-cases is increased. We propose a running code for an IETF document, and based on an emulated platform and on open-source software, this paper proposes values of performance metrics just as one piece of the puzzle. The final performance objective requires consensus among the different actors. The objective should be challenging enough for satellite operators to allow QUIC traffic but reasonable enough to keep QUIC Internet.

IEEE2020

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Nanometric axial resolution of fibronectin assembly units achieved with an efficient reconstruction approach for multi-angle-TIRF microscopy

Sébastien Schaub, Emmanuel Emilien Louis Soubies

High resolution imaging of molecules at the cell-substrate interface is required for understanding key biological processes. Here we propose a complete pipeline for multi-angle total internal reflection fluorescence microscopy (MA-TIRF) going from instrument design and calibration procedures to numerical reconstruction. Our custom setup is endowed with a homogeneous field illumination and precise excitation beam angle. Given a set of MA-TIRF acquisitions, we deploy an efficient joint deconvolution/reconstruction algorithm based on a variational formulation of the inverse problem. This algorithm offers the possibility of using various regularizations and can run on graphics processing unit (GPU) for rapid reconstruction. Moreover, it can be easily used with other MA-TIRF devices and we provide it as an open-source software. This ensemble has enabled us to visualize and measure with unprecedented nanometric resolution, the depth of molecular components of the fibronectin assembly machinery at the basal surface of endothelial cells.

2019

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While Virtual Reality applications attract the attention of developers and business analysts, the behavior of users watching 360-degree videos with Head-Mounted Display (HMD) has still to be understood. This paper introduces a dataset of the head movements of users who watch omnidirectionnal videos with a HMD. The dataset was collected on 59 users (including 20% of women) with the Razer OSVR HDK2 HMD. We used five 70 s-long 360-degree videos. These videos span a wide range of 360-degree content, including tourism, thrill, and discovery, for which different viewer’s involvement, thus navigation patterns, could be expected. We describe the open-source software that we developed to produce this dataset, present the test material and the viewing sessions conditions. We release the source code of the software to enable the community to extend the dataset. Finally we show a typical analysis of the dataset to exhibit some key characteristics of the used videos, and to show some users movement statistics.

2017

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