University of Marne-la-Vallée

About: University of Marne-la-Vallée is a based out in . It is known for research contribution in the topics: Estimator & Context (language use). The organization has 831 authors who have published 1855 publications receiving 55316 citations.

SALT: A simple application logic description using transducers for Internet of Things

Abstract: As the Internet of Things (IoT) grows in interest from both research and industrial parts, the lack of standard solutions to quickly and easily build and install IoT applications becomes a topic of high interest. In this paper, we introduce a language called SALT (Simple Application Logic description using Transducers) that allows describing and deploying the distributed logic needed in order to fulfil a complete desired application. This language aims at giving extended functionalities by filling the gap between the logical capabilities offered by services orchestration and the closeness efficiency of services choreography. SALT is interpreted by a virtual machine running on devices that introduces an abstraction layer in order to simplify access to hardware capabilities. SALT implements several mechanisms to comply with organisation issues presented in the Services Oriented Computing realm dealing with Services interactions, adapted to the specific constraints of the IoT. This work details SALT's concepts, formalism and implementation.

38 GHz MMIC PHEMT-based tripler with low phase-noise properties

Abstract: Frequency translation circuits are key elements in communication systems. This paper presents a frequency tripler for 38 GHz short-range communication systems, designed using a pseudomorphic high electron-mobility transistor (PHEMT) technology. The successful first iteration MMIC achieved a state-of-the-art output power of 3.1 dBm and a minimum conversion loss of 3.4 dB. The multiplier exhibits a conversion efficiency of 11% and average phase noise degradation at 10 kHz and 100 kHz offset-frequency from carrier of 9/spl plusmn/1 dB. To our knowledge, this is the first reported Ka-band single-stage frequency tripler based on PHEMT technology that has been fully characterized for phase noise degradation.

Tolerance to Commuting in Urban Household Location Choice: Evidence from the Paris Metropolitan Area

Abstract: Many social scientists consider improvements in urban travel facilities during the last decades of the 20th century to have significantly weakened proximity constraints, and therefore think that home-workplace proximity is no longer a major factor in household location choice. They believe that better transport conditions give households more freedom in selecting their homes and workplaces, regardless of the distance separating these two locations. We argue that this point of view underestimates the costs of daily commuting (which remains an increasing function of trip length) and consequently overestimates households' tolerance to commuting. The aim of our research is to measure how much weight households give to home-workplace proximity in actual location choices. Using survey data from the Paris-Ile-de-France metropolitan area, we carry out analyses to estimate two values: (i) the share of home and workplace changes (observed between 1991-2002) which either bring home and workplace closer to each other or keep these two places close to each other, and (ii) the "life expectancy" of job-residence combinations imposing long-distance commutes.

Fluorescence from the CS22+ dication: Theory and experiment

Abstract: The recently discovered CS 2 2 + emission has been investigated experimentally and theoretically, leading to the identification of two separate fluorescent dicationic transitions ( X 3 Σ g - ← 1 3 Σ u - and 1 1 Δ g ← 1 1 Δ u ). The vertical energies of the fluorescent electronic states were directly obtained by detecting photons in coincidence with electron pairs. Their assignment was aided by the use of glass filters to isolate the spectral region of each emission and by performing highly correlated MRCI calculations at a range of geometries. The potential energy curves thus generated predict bound potential energy functions for all linear Σ and Δ states of triplet and singlet spin multiplicities, throughout the energy range studied. Dissociation onsets for different fragmentation pathways are re-evaluated by detecting ions in coincidence with electron pairs. The C + + S + onset is revised downwards to 36.8 ± 0.4 eV and C + + S 2 + formation is found to arise from non-statistical dissociation of a limited number of precursor states, which have been identified to be the electronically excited CS 2 2 + formed in bent structures at these internal energies. Assignments have been attempted for all fragment emissions observed by measuring quantum yields as a function of the selected spectral region.