International Professional University of Technology in Nagoya Repository
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A CAN Network Architecture for Gate Drivers Dedicated to Wide Band Gap Components
No full textInternational audienceIn this paper, an innovative communicationnetwork architecture for gate drivers is presented. It is adaptedfor wide band gap gate drivers, particularly SiC MOSFET, in theworking environment of power electronics with high dv/dt of125kV/μs under 1.5kV. In this paper, aspects linked to theconstitution of the entire communication network and itstopology are exposed. The design of the section of the networkthat guarantees the galvanic isolation is detailed. A model of theexposed structure has been established and is described in thispaper. The results obtained through this model are exposed for acarrier frequency band going from 300kHz to 30MHz. The finalchoices concerning the parameters considered in the model arespecified, as well as the carrier frequency. The electronicstructure of the modulator is presented for an application with abit rate equal to 1Mbit/s
Rendering Deformed Speckle Images with a Boolean Model
No full textInternational audienceRendering speckle images affected by a given deformation field is of primary importance to assess the metrological performance of displacement measurement methods used in experimental mechanics and based on digital image correlation (DIC). This article describes how to render deformed speckle images with a classic model of stochastic geometry, the Boolean model. The advantage of the proposed approach is that it does not depend on any interpolation scheme likely to bias the assessment process, and that it allows the user to render speckle images deformed with any deformation field given by an analytic formula. The proposed algorithm mimics the imaging chain of a digital camera, and its parameters are carefully discussed. A MATLAB software implementation and synthetic ground-truth datasets for assessing DIC software programs are publicly available
Un mécanisme d'extraction vers C pour Why3
No full textNational audienceNous présentons un mécanisme d'extraction d'un sous-ensemble des programmes écrits avec l'outil de vérification Why3 vers le langage C. Un modèle mémoire partiel mais simple permet aux utilisateurs d'écrire des programmes Why3 dans un style impératif très proche du C, avec une gestion manuelle et vérifiée formellement de la mémoire. De tels programmes peuvent ensuite être extraits de manière transparente vers du code C idiomatique, ce qui évite d'introduire des pertes de performances à l'extraction
Heavy vehicles on the road towards the circular economy: Analysis and comparison with the automotive industry
No full textInternational audienceWith 270 million light vehicles and 20 million heavy-duty and off-road (HDOR) vehicles in use in the European Union, the automotive and HDOR industries form two major sectors of the European economy. Each year, 12 million light vehicles plus 1 million HDOR vehicles reach the end of their lives. In a circular economy perspective, the following two questions are of growing concern: (i) to what extent is the circular economy achieved and implemented in the automotive and HDOR sectors? (ii) what industrial practices and regulations are prevalent and commendable for the circular economy? The end-of-life management of light vehicles (subject to the ELV Directive 2000/53/EC) has been widely studied in the literature, but the end-of-life stage of HDOR vehicles has long been neglected by researchers. To fill this gap, both extensive literature survey and in-depth industrial investigations were conducted. Key factors, i.e. regulations, business models and market evolution, and integration of new emerging technologies affecting the circular economy performance of the automotive and HDOR sectors were analysed. Lessons learned from best industrial practices are highlighted, and remaining challenges for a more circular economy are identified. The two industries are compared in terms of the four buildings blocks of the circular economy and the four possible feedback loops defined by the Ellen MacArthur Foundation. This research contribution can lead on to practical applications, e.g. help industrial practitioners and policy makers take up the challenges and seize opportunities to close the loops for HDOR vehicles through different approaches
Substrat alvéolaire fonctionnalisé et structure composite sandwich intégrant un tel substrat
No full textMajors of functions
No full textInternational audienceWe investigate the minor order of functions, focusing on upper covers and common upper bounds of pairs of functions. We show that two functions of arities m and n have a common upper bound if and only if they have a common lower bound, and if a common upper bound exists, then there is one of arity m + n − 1. Moreover, we determine the possible essential arities of upper covers of functions
Radical Innovation Design: Innover par les usages grâce à l’identification de poches de valeur
No full textNational audienceAprès avoir fait le constat que les grandes entreprises françaises pilotent encore très peu leur processus d’innovation, nous établissons le besoin d’une organisation et d’une méthodologie d’innovation radicale tirée par les usages. Nous avons développé et expérimenté depuis 2009 une méthodologie d’innovation radicale tirée par les usages, dénommée Radical Innovation Design® (RID), dans le but de répondre aux attentes de pilotage de l’innovation par les usages. RID présente un processus structuré de pose puis de résolution de problème centré sur l’obtention de poches de valeur obtenues par l’identification de problèmes importants apparaissant dans des situations d’usage fréquentes et pour lesquels les solutions existantes apportent peu ou pas d’améliorations. Ces poches de valeur font alors l’objet d’un choix stratégique par les entreprises pour établir un périmètre d’ambition. Ce dernier, qui remplace avantageusement le traditionnel brief marketing, est le point de départ de séances de créativité ciblées très efficaces. La méthodologie RID est décrite au travers de l’exemple d’une innovation en santé dans le cadre de l’imagerie dentaire
Further remarks on the effect of multiple spectral values on the dynamics of time-delay systems. Application to the control of a mechanical system
No full textInternational audienceA question of ongoing interest for linear Time-delay systems is to determine conditions on the equation parameters that guarantee the exponential stability of solutions. In recent works a new interesting property of time-delay systems was emphasized. As a matter of fact, the multiple spectral values for time-delay systems was characterized by using a Birkhoff/Vandermonde-based approach. Then, a multiplicity induced stability criteria exhibited for reduced order systems; scalar delay-equations and a special class of second order systems. This work, further explores such a criteria and shows their applicability to the control of a mechanical system
Saliency-based multi-feature modeling for semantic image retrieval
No full textInternational audienceSemantic gap is an important challenging problem in content-based image retrieval (CBIR) up to now. Bag-of-words (BOW) framework is a popular approach that tries to reduce the semantic gap in CBIR. In this paper, an approach integrating visual saliency model with BOW is proposed for semantic image retrieval. Images are firstly segmented into background regions and foreground objects by a visual saliency-based segmentation method. And then multi-features including Scale Invariant Feature Transform (SIFT) features packed in BOW are extracted from regions and objects respectively and fused considering different characteristics of background regions and foreground objects. Finally, a fusion of z-score normalized Chi-Square distance is adopted as the similarity measurement. This proposal has been implemented on two widely used benchmark databases and the results evaluated in terms of mean Average Precision (mAP) show that our proposal outperforms the referred state-of-the-art approaches. © 2017 Elsevier Inc
Long-Short Range Communication Network Leveraging LoRa and Wake-up Receiver
No full textInternational audienceWireless sensor and actuator networks play a central role in the Internet of Things, and a lot of effort is devoted to enable energy efficient and low latency communications. In the recent years, low power communications has evolved towards multi-kilometer ranges and low bit-rate approaches such as LoRa TM. However, the medium access layer protocols rely on the well-known duty-cycling schemes, which require a trade-off between power consumption and latency for message transfer from the gateway to the nodes. Domains such as industrial applications in which sensors and actuators are part of the control loop require predictable latency, as well as low power consumption. Emerging ultra-low-power wake-up receivers enable pure-asynchronous communications, allowing both low latency and low power consumption, but at the cost of a lower sensitivity and lower range than traditional wireless receivers and LoRa TM. In this work, we propose an energy efficient architecture that combines long-range communication with ultra low-power short-range wake-up receivers to achieve both energy efficient and low latency communication in heterogeneous long-short range networks. A hardware architecture as well as a protocol is proposed to exploit the benefits of these two communication schemes. Experimental measurements and analytical comparisons show that the proposed approach remove the need for a trade-off between power consumption and latency