A collaborative web platform for sound archives management and analysis

In the context of digital sound archives, an innovative web framework for automatic analysis and manual annotation of audio files has been developed. This web framework, is called Timeside and is available under an open-source license. The TimeSide framework associates an audio processing engine, an audio database, a web API and a client-side multimedia player. The audio processing engine is written in Python language and has been designed for speech and audio signal analysis and Music Information Retrieval (MIR) tasks. It includes a set of audio analysis plugins and additionally wraps several state-of-the-art audio features extraction libraries to provide automatic annotation, segmentation and Music Information Retrieval analysis. It also provides decoding and encoding methods for most common multimedia formats. The audio database application is handled through Django (Python) and is interfaced with the audio processing engine. The web API component provides these functionalities over the web to enable web client to run analysis on the sounds in the audio database. Last but not least, the multimedia player provides an web player associated with several sound and analysis visualizations together with an annotations editor through a multi-tracks display. The TimeSide platform is available as an open-source project at the following addresses: TimeSide: https://github.com/Parisson/TimeSid

A rough-cut capacity planning model with overlapping

In the early phases of projects, capacity planning is performed to assess the feasibility of the project in terms of delivery date, resource usage and cost. This tactical approach relies on an aggregated representation of tasks in work packages. At this level, aggressive project duration objectives are achieved by adopting work package overlapping policies that affect both workload and resource usage. In this article, we propose a mixed-time MILP model for project capacity planning with different possibilities for overlapping levels between work packages. In the model, the planning time horizon is divided into time buckets used to evaluate resource usage, while starting and ending times for work packages are continuous. The model was tested on a benchmark of 5 sets of 450 theoretical instances each. More than half of the tested instances were solved to optimality within 500 s. Results also show that, while overlapping is more beneficial for accelerating project delivery times, it can still have a positive impact on project cost by allowing a better distribution of workload. Finally, overlapping options seem to have less influence on the performance of the model than project slack or number of work packages

A rough-cut capacity planning model with overlapping

In the early phases of projects, capacity planning is performed to assess the feasibility of the project in terms of delivery date, resource usage and cost. This tactical approach relies on an aggregated representation of tasks in work packages. At this level, aggressive project duration objectives are achieved by adopting work package overlapping policies that affect both workload and resource usage. In this article, we propose a mixed-time MILP model for project capacity planning with different possibilities for overlapping levels between work packages. In the model, the planning time horizon is divided into time buckets used to evaluate resource usage, while starting and ending times for work packages are continuous. The model was tested on a benchmark of 5 sets of 450 theoretical instances each. More than half of the tested instances were solved to optimality within 500 s. Results also show that, while overlapping is more beneficial for accelerating project delivery times, it can still have a positive impact on project cost by allowing a better distribution of workload. Finally, overlapping options seem to have less influence on the performance of the model than project slack or number of work packages

3D geomodelling combining implicit surfaces and Voronoi-based remeshing: A case study in the Lorraine Coal Basin (France)

International audienceIn this paper we demonstrate how recent geomodelling techniques can be combined and used to build a 3D geological model on a real case study: the former coal mine of Merlebach (France), that is targeted to be exploited for low-temperature geothermal energy production. From geological maps, cross-sections, borehole and mine exploitation data, we build a 3D model in which are identified the rocks and infrastructures having significantly different permeabilities. First, a structural model of the main geological interfaces in our area of interest (2 horizons and 13 faults) is built with classical geomodelling techniques. Then, we propose to model by surfaces the 71 irregularly stacked, very close and very thin, subvertical coal beds. To ease their construction, we use an implicit method which represents 3D surfaces as isovalues of a scalar field defined in a 3D tetrahedral grid of the area. The corresponding triangulated surfaces are remeshed with a recently proposed method based on Voronoi diagrams so that the exploited parts of the coal beds, now filled by sand, can be computed. The 3D surface-based geological model, in which infrastructures can be inserted as piecewise lines, can be volumetrically meshed. It is available for download as supplemental material, as well as a volumetric grid

Resistive-nanoindentation: contact area monitoring by real-time electrical contact resistance measurement

International audienceIn the past decades, efforts have been made to couple nanoindentation with resistive measurements in order to monitor the real-time contact area, as an alternative to the use of traditional analytical models. In this work, a novel and efficient stand-alone method is proposed to compute contact area using resistive-nanoindentation of noble metals (bulk or thin films). This method relies on three steps: tip shape measurement, setup calibration, application to the sample to be characterized. The procedure is applied to nanoindentation tests on a sample with film-on-elastic-substrate rheology and is successfully validated against experimental measurements of the contact area

Détection de personnes dans les vidéos pour leur immersion dans un espace virtuel

Ce papier présente une application permettant d'extraire des personnes évoluant dans des séquences filmées en intérieur ou en extérieur par une caméra fixe. Ces personnes sont incrustées en temps réel dans un milieu virtuel de bande dessinée où elles peuvent interagir en tant qu'acteurs et spectateurs. L'originalité de notre méthode repose sur deux principaux points. Tout d'abord la détection de changement est effectuée en combinant deux types de masques : un masque région et un masque contour. Ensuite ces masques sont obtenus à l'aide d'une image de référence, qui est construite puis mise à jour régulièrement. Cette dernière prend ainsi en compte les différents changements qui apparaissent souvent lorsque la séquence dure plusieurs heures. Les résultats montrent que les personnes sont correctement et rapidement extraites

Testing Scenarios on Geological Models: Local Interface Insertion in a 2D Mesh and its Impact on Seismic Wave Simulation

In this work, we consider a relatively simple case of fluid monitoring in a subsurface gas reservoir. Seismic wave velocities for porous rocks vary depending on fluid saturation, and our objective is to quantitatively evaluate the impact of the water/gas contact depth on elastic wave propagation. To efficiently test different contact depth scenarios and assess their impact on wave propagation, we propose to locally modify a 2D geological model and run time-dependent elastic simulations. The input model is a triangulated surface conforming to geological structures and representing physical properties. The 2D meshed model is locally updated, meaning that only a given region is modified and that the other parts of the mesh remain identical. To create several models by modifying only the reservoir layer, we insert a water/gas contact defined by a level-set at several depths with MMG. During the insertion, specific care is taken to maintain the conformity of the output mesh. As compared to global remeshing, the local modification reduces the cost of recomputing physical properties over the updated mesh. We run the numerical simulations by using Hou10ni2D code, which is based on a Discontinuous Galerkin method. Our results on a gas reservoir show a consistent behavior: we observe a correlation between the depth difference and L2-norm, the larger the distance from the reference depth contact, the higher the L2-norm. This approach could therefore be integrated into an inversion loop to determine the position of the fluid contact and reduce uncertainties in the reservoir model

A 2 Million Commercial Song Interactive Navigator

International audienceIn this paper, we present a web-based interactive tool for exploring a collection of two million commercially released songs. It gathers song information from a large number of heterogeneous sources, web-based and audio-based, and integrates work from multiple research groups. The resulting tool can be used to request information about a specific song such as lyrics, metadata and chords; to navigate further on to linked external resources such as Discogs, AllMusic, Mu-sicBrainz or a number of streaming providers; or to browse the collection by artist's discographies or band membership. Several Web Audio applications are integrated and use the dataset to enrich the experience