South Green bioinformatics platform : Plateforme collaborative de bioinformatique verte héraultaise

Drivers and other road users often encounter situations where priority is unclear or ambiguous, but must be resolved, for example, after arriving at an intersection nearly simultaneously. The participants in such scenarios reach agreement by communicating; while instinctive to humans, this is a significant challenge for autonomous vehicles. Currently, the nature of interaction for resolving ambiguous road situations between pedestrians and autonomous vehicles remains mostly in the realm of speculation, for which no direct means for expressing intent and acknowledgment has yet been established. This thesis approaches the challenge by contributing a model and approach for planning that can produce actions that are expressive and encode certain aspects of intent; the result is communicative in that vehicle-pedestrian coordination arises via a negotiation of intent in a prototypical unsignalized intersection crossing scenario. We deliberately construct a prototypical crossing setting with a vehicle and one pedestrian at an unsignalized intersection such that there is substantial ambiguity in crossing order. A decision-theoretic model is then used for capturing this scenario along with its ambiguity as uncertainty arising from non-determinism and partial observability. We solve the problem by first proposing a Markov decision process to express the interaction at the intersection. Next, we focus on the partial-observability and include it in the model to generate a sequence of vehicle actions by solving via a state-of-the-art online solver. We implement the approach on a self-driving Ford Lincoln MKZ platform and examine an experimental setting involving real-time interaction. The experiment shows that the method achieves safe and efficient navigation. We analyze the resulting policy in detail in simulation and examine the coupled behavior of the vehicle and pedestrian, interpreting evidence for implicit communication that emerges as the two resolve ambiguity to achieve safe and efficient navigation

Wide-band simulations of differential 3D interconnect propagation performances in a photonic interposer

International audienc

Modélisation haute fréquence de « Through Silicon Via » en fonction des matériaux, des architectures last et middle et des modes de transmission

National audienc

Influence of thermal and acidic treatments on the morphology of a natural kaolinitic clay mineral

peer reviewedIn this work, a natural kaolinitic clay mineral from Kribi in Cameroon is modified by thermal and acidic treatments. The influence of these treatments on the physicochemical properties of the clays is studied using X-ray diffraction, Fourier transform infrared spectroscopy, nitrogen adsorption-desorption measurements, scanning electron microscopy, inductively coupled plasma-atomic emission spectroscopy and thermal analysis. Three calcination temperatures are explored: 600, 700 and 800 °C. The XRD pattern of the untreated clay showed that the natural clay mineral was mostly composed of kaolinite. Calcination at high temperatures allowed the amorphization of the natural kaolinitic clay mineral to obtain metakaolinite. This heat treatment of the natural clay mineral produced disintegration by rupture of the strong hydrogen bonds between the layers of the clay mineral. Heat treatment did not increase the specific surface area of the clay, which stayed around 20-30 m 2 /g. The acid treatment produced a high material texture modification giving microporous materials with a large surface area up to 315 m 2 /g with the sample previously calcined at 800 °C. The microporosity and mesoporosity increase is greater when the clay is calcined at high temperature. The morphology of the samples observed by SEM are modified by the acidic treatment. The initial two-dimensional stacking of particles evolves towards a narrower threedimensional porous structure. These treatments open the way to produce highly porous clay materials that could be used as adsorbent materials for pollutant removal from water

Caractérisation très large bande des oxydes ZrO2 et TiTaO à permittivité élevée pour la réalisation de capacités MIM RF intégrées

National audienc

Obsessive compulsive disorder (OCD)

Obsessive compulsive disorder (OCD) is a frequent and disabling psychic illness. Along psychiatric history, several etiological models have been successively hypothesized to explain the obsessive compulsive symptoms from a psychological, behavioural or biological point of view. This review aims at presenting OCD etiological models as well as describing OCD clinical and therapeutic aspects

3D interconnect optimization for single channel 100-GBps transmission in a photonic interposer

International audienceHigh speed 3D interconnects are a key element in 2.5D interposer technology that is widely investigated for high performance applications. A wide-band electrical modeling and optimization method of the photonic interposer interconnect chains is presented using scalable models developed based on electromagnetic simulations. Resulting models enable fast and accurate assessment of the whole-chain performances for various sets of technology and design parameters. Using these tools, transmission of 100-Gbps signal through Back-end-of-Line (BEOL), Through Silicon Via (TSV) and Redistribution Layer (RDL) chains are improved following two different methods: independent optimization of each interconnect and optimization of the whole chain. Both techniques are compared for TSV-RDL chain case with wide-range parameter variation and for BEOLTSV-RDL path satisfying design and technology constraints. Optimization results are validated through comparison with 3DEM simulation, demonstrating the efficiency of proposed methods to optimize the entire 3D-chain. Results would lead to further works including eye-diagram opening and power consumption optimization, geometrical discontinuity modeling and optimized chain integration

Modélisation et caractérisation de capacités 3D dans un interposeur silicium

International audienc

Electrical Model of Different Architectures of through Silicon Capacitors for High Frequency Power Distribution Network (PDN) Decoupling Operations

International audienc