Deep recommender engine based on efficient product embeddings neural pipeline

Predictive analytics systems are currently one of the most important areas of research and development within the Artificial Intelligence domain and particularly in Machine Learning. One of the "holy grails" of predictive analytics is the research and development of the "perfect" recommendation system. In our paper, we propose an advanced pipeline model for the multi-task objective of determining product complementarity, similarity and sales prediction using deep neural models applied to big-data sequential transaction systems. Our highly parallelized hybrid model pipeline consists of both unsupervised and supervised models, used for the objectives of generating semantic product embeddings and predicting sales, respectively. Our experimentation and benchmarking processes have been done using pharma industry retail real-life transactional Big-Data streams.Comment: 2018 17th RoEduNet Conference: Networking in Education and Research (RoEduNet

ENHANCING ADMINISTRATIVE SERVICES THROUGH DOCUMENT MODELS

As the European Service Directive has already been enforced, a new challenge is to ensure a fully interoperable e-Government environment at the European level. The new dimension of the public administration process raises several issues that have to be addressed in order to successfully integrate systems from various administrative models. The current Single Point of Contact implementation assures that e-Government procedures can be completed at distance and by electronic means and that the information related to national requirements and procedures will be easily accessible for service providers and service recipients. In this context, a future goal will be to ensure the means in which different PSC will be able to interoperate. This is a complex task because each PSC has its own specific particularities and deals with various document types and formats. Creating common specifications for the documents types, formats and interchange containers is a mandatory stage in achieving the desired interoperability. In this paper we focus to the process of creating a unique document model for pan-European document interchanges. The document model will be used for the communication between PSCs. The communication between PSCs and national authorities will be done independently. The document model consists on both semantic and security metadata. This document model will be properly derived from e-Government ontology. Here we are presenting the initial assumptions and architectural issues that are elicited and will be used in order to create a fully functional model. We rely on the former experience gained in engineering a Romanian PSC proof of concept and we will extend our achievements to address the PSC interoperability goal.e-Government, interoperability, e-documents ontologies

Recovering Single-Crossing Preferences From Approval Ballots

An electorate with fully-ranked innate preferences casts approval votes over a finite set of alternatives. As a result, only partial information about the true preferences is revealed to the voting authorities. In an effort to understand the nature of the true preferences given only partial information, one might ask whether the unknown innate preferences could possibly be single-crossing. The existence of a polynomial time algorithm to determine this has been asked as an outstanding problem in the works of Elkind and Lackner. We hereby give a polynomial time algorithm determining a single-crossing collection of fully-ranked preferences that could have induced the elicited approval ballots, or reporting the nonexistence thereof. Moreover, we consider the problem of identifying negative instances with a set of forbidden sub-ballots, showing that any such characterization requires infinitely many forbidden configurations.Comment: To appear in WINE'23; add acknowledgements, change formatting, minor correction

Identification of Young's Modulus from Indentation Testing and Inverse Analysis

International audienceIn this study, a numerical method for the identification of the Young's modulus of linear elastic coated materials from continuous indentation test is first presented. The identification is based on an inverse analysis where the minimization of a cost functional is performed by a gradient descent algorithm. The main result is the computation of cost function gradient by using a direct differentiation technique, resulting in a time saving method compared to the widely used finite difference method. The validity and illustration of this approach is shown through several numerical examples. The second part of this article is dedicated to the identification of elasto-plastic thin films Young's modulus. A new method is proposed, where the inverse analysis relies only on finite element computations for elastic materials

Désynchronisation partielle de la méthode APHR

National audienceCe papier traite de la désynchronisation des variables internes dans la résolution de problèmes élasto-plastiques en utilisant la méthode APHR (A Priori Hyper Reduction). Cette méthode a priori ne nécessite en amont aucune prévision éléments finis (EF) et permet la construction d'un modèle d'ordre réduit (ROM). Dans la continuité des travaux menés [4], la formulation multi-niveaux est utilisée de façon désynchronisée sur une plaque avec inclusions. Les résultats seront critiqués en termes de précision et d'efficacité numérique

A computational approach for the fatigue design of threaded connections

International audienceThe aim of this paper is to propose a lifetime prediction method for threaded connections. The example discussed here is a drillstring connection used in the oil and gas industry. The method is based on a mechanical analysis performed either with finite elements or a closed-form solution described in a companion paper, and a fatigue analysis using the Dang Van criterion which has been extended to finite life domain. The mechanical analysis provides the stabilized stress path and the fatigue analysis provides the fatigue life. Fatigue tests have been performed on small scale threaded connections in order to validate the methodology. The comparisons with the predictions show the difficulties to estimate the fatigue life on structures presenting high stress gradient due to scale effects

Semianalytical solution for the stress distribution in notched tubes

International audienceThe aim of this paper is to present an alternative solution to the finite element method for the determination of the elastic stress field for an axi-symmetric notched tube under tension and bending loadings. The proposed solution is an extension of the work of Filippi and Lazzarin (2004) [8] to tubular specimens. It provides the stress field distribution along the notch bisector. A good agreement was found between the solution proposed in the present paper and the results from a finite element analysis. A sensitivity analysis is performed to establish the domain of validity of the solution with respect to the dimensions of the notched tube

Numerical and experimental modal analysis of the reed and pipe of a clarinet

International audienceA modal computation of a complete clarinet is presented by the association of finite-elementmodels of the reed and of part of the pipe with a lumped-element model of the rest of the pipe. In the first part, we compare modal computations of the reed and the air inside the mouthpiece and barrel with measurements performed by holographic interferometry. In the second part, the complete clarinet is modeled by adjoining a series of lumped elements for the remaining part of the pipe. The parameters of the lumped-resonator model are determined from acoustic impedance measurements. Computed eigenmodes of the whole system show that modal patterns of the reed differ significantly whether it is alone or coupled to air. Some modes exhibit mostly reed motion and a small contribution of the acoustic pressure inside the pipe. Resonance frequencies measured on a clarinet with the mouthpiece replaced by the cylinder of equal volume differ significantly from the computed eigenfrequencies of the clarinet taking the actual shape of the mouthpiece into account and from those including the (linear) dynamics of the reed. This suggests revisiting the customary quality index based on the alignment of the peaks of the input acoustical impedance curve

The Reciprocity Gap Functional for Identifying Defects and Cracks

International audienceThe recovery of defects and cracks in solids using overdetermined boundary data, both the Dirichlet and the Neumann types, is considered in this paper. A review of the method for solving these inverse problems is given, focusing particularly on linearized inverse problems. It is shown how the reciprocity gap functional can solve nonlinear inverse problems involving identification of cracks and distributed defects in bounded solids. Exact solutions for planar cracks in 3D solids are given for static elasticity, heat diffusion and transient acoustics