Prediction of Traffic for Internet Domains

This disclosure describes techniques to generate predictions regarding genuine traffic that a domain is likely to receive without access to historical data about the domain. Domain traffic data for known domains is utilized to learn characteristics of domains that are likely predictors of traffic that the domains receive. Characteristics of a query domain are used predict traffic that the query domain is likely to receive. Traffic predictions can be used to identify domains that buy referral traffic and to evaluate domains

An infrastructure for planning, monitoring and reusing capstone projects with the help of semantic wikis

International audienceThe capstone project provides students, working in groups, with a significant project experience. Students should deliver one or several iterations of a software system, along with all artifacts appropriate to the process model they are using. A system based on reference and organizational models and powered by three semantic wikis (using SMW) is used to help the drive of capstone projects. This paper describes aspects raised by challenges of capstone projects management and presents the infrastructure of the solution we built

Turbulence-airfoil interaction noise reduction using wavy leading edge: an experimental and numerical study

International audiencePassive treatments aiming at reducing turbofan broadband noise have been recently studied in the framework of European Project FLOCON. A concept based on a sinusoidal variation of the leading edge of a single airfoil expected to decrease interaction noise has been investigated by ONERA. Turbulence-airfoil interaction mechanism is achieved using a turbulence grid located upstream of a NACA airfoil tested in ISVR anechoic open wind tunnel. High noise reductions are obtained (3-4 dB) for all studied flow speeds. Experimental work is supplemented by numerical simulations using RANS/LES and CAA Euler-based approaches to predict the acoustic response of the wing. Isentropic turbulence is synthetically injected by means of a suited inflow boundary condition. Unsteady simulations are restricted to the baseline case (without treatment) and the present paper focuses on direct Euler methodology which provides reliable power spectrum density comparing to experiment. Effect of leading edge serrations on aerodynamics and noise is emphasized using Amiet thin airfoil theory, RANS solutions and available measurements

The importance of scale structure in scattering from random, rough surfaces

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1998.Includes bibliographical references (leaves 237-244).by Vincent Lupien.Ph.D

Successful reduction of cholelithiasis in a Holstein cow

peer reviewedA pregnant 3.5 year-old high-productive Holstein cow in the third month of lactation showed colic signs, marked anorexia, and stopped milk production. Clinical examination revealed tachypnea, pyrexia and the mucous membranes were all congested. Signs of abdominal discomfort were observed, the abdomen was tense and painful; digestive activity was poor. Blood investigations revealed inflammation, cholestasis, and leucocytosis with marked neutrophilia. Trans-abdominal ultrasonography revealed decreased digestive transit and enlarged gall-bladder. Hepatic or biliary involvement was suspected. A right-flank exploratory laparotomy revealed a gallbladder filled with firm and mobile 0.5 to 1cm diameter fluctuant masses. Digital palpation allowed cholelith extraction through the cystic duct into the duodenum. After the surgery, the cow progressively regained a normal appetite and pain signs decreased. Blood samples analysed 10 days after the surgery still showed inflammation but to a lesser extent. Hepatic enzymes were markedly increased, indicating hepatic injury. Three months after the surgery, the cow was healthy and was inseminated. This case report suggests that cholelithiasis may be diagnosed and successfully treated in early stage of the disease in cattle, though this condition is rare in this species. This is the second report of manual cholelith extraction in a cow

A new data-based modelling method for identifying parsimonious nonlinear rainfall/flow models

International audienceThe identification of rainfall/runoff relationship is a challenging issue, mainly because of the complexity to find a suitable model for a whole given catchment. Conceptual hydrological models fail to describe correctly the dynamic changes of the system for different rainfall events (e.g. intensity or duration). However, the need for such relationship grows with the water pollution increase in agricultural regions. Lately, a well-known type of model in the control field appears to be a suitable candidate for water processes identification: the Linear Parameter Varying (LPV) models. This paper depicts a novel refined instrumental variable based method for the identification of Input/Output LPV models and this algorithm is applied to identify a parsimonious nonlinear rainfall/flow model of a 42 ha vineyard catchment located in Alsace, France

Identification de modèles LPV : application à la modélisation pluie/débit d'un bassin versant viticole

International audienceL'identification de la relation pluie/débit dans un bassin versant pour la prédiction de débit est un problème stimulant de par la difficulté à caractériser un modèle les décrivant dans leur ensemble. Les modèles conceptuels, basés sur les lois et modèles hydrauliques simples sont sou- vent limités dans la précision de la prédiction qu'ils offrent. L'objectif de cet article est d'une part de montrer l'intérêt des modèles non linéaires de type Linéaires à Paramètres Variants (LPV) par rapport aux modèles linéaires, ainsi que la différence de qualité dans les résultats obtenus selon la méthode employée pour l'identification d'un modèle donné. D'autre part, cet article propose et analyse plusieurs variables de séquencement dont dépendent les paramètres variants des modèles LPV pour représenter les bassins versants ruraux

R-MOM: A Component-Based Framework for Interoperable and Adaptive Asynchronous Middleware Systems

International audienceSystems of systems (SoS) are composed of subsystems such as Distributed, Information Technology, Real-Time and Embedded systems. Among distributed systems, Message- Oriented Middleware (MOM) is used by SoS in order to share status information from system elements (component, service, etc.). Often several different MOM technologies are used in one SoS, then interoperability between these MOM is a requirement. In this paper, we present R-MOM, a component-based framework for interoperable and adaptive asynchronous middleware systems. R-MOM provides a reflective component architecture where one MOM functionality is embedded into one component which is modifiable at run-time. Loosely-coupling between reflective components permits to get a fined-personalization of MOM functionalities, such as protocol, encoding rule, Quality of Services (QoS) processing, data production/consumption, description, routing and filtering. Interoperability between integrated protocol functionalities is a consequence of architecture design. R-MOM interoperates with different kinds of MOM, from distributed message queues (Java Message Service, Advanced Message Queueing Protocol, 0MQ) to content-based publish/ subscribe systems (OMG's Data Distribution Service). This paper describes the architectural concepts of the R-MOM framework, discusses its implementation, and evaluates its interoperability capability.Les Systèmes de Systèmes (SoS) sont composés de sous-systèmes tels que les systèmes de type distribué, IT, temps-réel et embarqué. Parmi les systèmes distribués, les intergiciels orientés message (MOM) sont utilisés par les SoS dans le but de partager des informations de statut des éléments du systèmes (composant, service, etc...). Souvent, plusieurs technologies MOM sont utilisées dans un même SoS, et interopérabilité entre MOM devient nécessaire. Dans ce papier, nous présentons R-MOM, un canevas basé sur l'approche composant pour les intergiciels interopérables, adaptatifs et asynchrones. R-MOM offre une architecture à composants réflexif, où une fonctionalité d'un MOM est embarquée dans un composant qui est modifiable durant son exécution. Le couplage lâche entre les composants réflexif permet de jouir d'une personnalisation fine sur les fonctionalités MOM visées, comme le protocole, la règle d'encodage, le support des qualités de service, la production et consommation, la description, le routage et le filtrage des données. L'interopérabilité entre les fonctionnalités protocolaire intégrées est une conséquence du choix de conception de l'architecture. R-MOM est interopérable avec différent types de MOM, depuis les queues de message distribué (Java Message Service, Advanced Message Queueing Protocol, 0MQ) jusqu'aux systèmes de publication/souscription basées sur le contenu (Service de Distribution de Données de l'OMG). Ce papier papier décrit les concepts d'architecture du canevas R-MOM, discute son implémentation et évalue sa capacité d'interopérabilité

All-optical coherent pulse compression for dynamic laser ranging using an acousto-optic dual comb

We demonstrate a new and simple dynamic laser ranging platform based on analog all-optical coherent pulse compression of modulated optical waveforms. The technique employs a bidirectional acousto-optic frequency shifting loop, which provides a dual-comb photonic signal with an optical bandwidth in the microwave range. This architecture simply involves a CW laser, standard telecom components and low frequency electronics, both for the dual-comb generation and for the detection. As a laser ranging system, it offers a range resolution of a few millimeters, set by a dual-comb spectral bandwidth of 24 GHz, and a precision of 20 µm for an integration time of 20 ms. The system is also shown to provide dynamic measurements at scanning rates in the acoustic range, including phase-sensitive measurements and Doppler shift velocimetry. In addition, we show that the application of perfect correlation phase sequences to the transmitted waveforms allows the ambiguity range to be extended by a factor of 10 up to ∼20 m. The system generates quasi-continuous waveforms with low peak power, which makes it possible to envision long-range telemetry or reflectometry requiring highly amplified signals