Experimental implementation of an Ultra-Wide Band MIMO radar

International audienceIn this paper, a radar system implementation isaddressed to detect a point target, that is a Multiple-InputMultiple-Output (MIMO) Radar. It is an emergent concept inradar field and has reached a substantial considerations. Theadvantages of MIMO radars is presented in comparison of SIMOand SAR radars. The simulation and measurement results showthat the MIMO Radars can reach a better angular resolutionwhile keeping a small number of antennas

Mise en oeuvre expérimentale d’un Radar MIMO Ultra-Large Bande

International audienceCe document présente la mise en oeuvre expérimentale d'un Radar MIMO ULB pour la détection de cibles ponc-tuelles. L'avantage du radar MIMO revient à améliorer la résolution angulaire sans avoir à augmenter le nombre d'antennes nécessaire dans les radars conventionnels et ce, grâce à la création d'un réseau d'antennes virtuelles plus large que le réseau physique. Les résultats obtenus en simulation et en mesure sont également comparés aux systèmes Radar classiques à balayage de faisceau (SIMO) et à ouverture synthétique (SAR)

Passive UWB Beamforming: a N to M Compression Study

International audience—Recent works have demonstrated the feasibility of microwave imaging using compressive techniques, exempting the use the of active delay lines, phase shifters, or moving parts to achieve beamforming. With this method, waves are coded in a passive way by a compressive device to reduce the complexity of the transmitter and/or receiver chains of the telecommunication and radar systems requiring beamsteering. Since this technique is based on frequency diversity, the reduction of the compressive device's volume imposes a diminution of the amount of driven antennas. In this article, the improvement brought by simultaneous excitations of the compressive device is presented. Adapting a new mathematical formulation, it is shown that M inputs can send independent waveforms allowing the beamsteering of an N-elements antenna array, while maintaining N > M

Imagerie MIMO ULB à haute résolution par un composant passif à port unique

National audienceUne technique de compression permettant l'acquisi-tion d'images RADAR 3D à haute résolution est présen-tée dans cet article. Basée sur un principe d'acquisition comprimée, les informations reçues par un réseau d'an-tennes MIMO ULB sont mesurées sur un port unique. Après reconstruction des formes d'ondes reçues en post-processing, il est alors possible de réaliser des images 3D de façon rapide grâce aux développements récents en terme d'algorithmes MIMO

Algorithme de projection pour l’imagerie microonde à haute résolution en temps réel

National audienceUne technique de calcul de projection 2D d'images radar est présentée dans cet article. Dans de nombreux cas tels que les scanners d'aéroport, une projection d'image 3D est suffisante pour détecter les éléments visés et ap-porte plus d'informations qu'une simple coupe 2D, no-tamment lorsque la distance de l'objet n'est pas connue précisément. En réalisant une projection des voxels à re-construire sur un plan, il est possible de diminuer le temps de calcul et la mémoire nécessaires à l'obtention des images. Le principe théorique de cette méthode est dé-veloppé dans ce papier suivi de résultats issus de simulations. Enfin, les gains apportés en termes de temps de calcul sont présentés

Caring moments within an interprofessional healthcare team: Children and adolescent perspectives

Patients are now recognized as key partners to improve healthcare outcomes. Some organisations such as the WHO or the Canadian Interprofessional Health Collaborative (CIHC) encourage considering patients as partners in the interprofessional healthcare team. However, limited knowledge exists on patients’ perspective of interprofessional collaboration (IPC) and of their role in the collaborative process, particularly in pediatric settings. The experiences and perspectives of patients regarding IPC have to be considered in order to fully understand the concept of IPC and integrate it into practice. This qualitative study aimed at gaining a better understanding of the perspective of children of IPC, how it affects their experiences of care and how they perceive their own role within the interprofessional team. Semi-structured interviews were used in the pediatric service of a Swiss university hospital, with ten children and adolescents aged between 11-17 years. The participants described the interactions they observed between nurses and physicians and provided insights into how they perceived the quality of that relationship. A respectful relationship between nurses and physicians may have improved the experience of a caring environment. The participants did not perceive their role to be pivotal into the interprofessional relationship. The findings of this study indicate that the interactions between healthcare professionals have an influence on the perspectives and experiences of the participants of their hospitalisation and of IPC. However, integrating children and adolescents into collaborative process will need a change of paradigm and beliefs regarding IPC

Unification of compressed imaging techniques in the microwave range and deconvolution strategy

International audience—In recent years, several techniques of imaging have emerged based on compressive sensing. Thus, using passive devices able to code and sum the information measured on a radiating aperture, complex UWB beamforming hardwares can be replaced by inverse problems to solve using deconvolution techniques. Two similar compressive techniques have been developed independently, based on a passive multiplexer and on a metamaterial aperture. This paper proposes an unification of these approaches, using a common mathematical formulation and comparing the deconvolution strategy adopted by each research team

The Canadian Atmospheric Model version 5 (CanAM5.0.3)

The Canadian Atmospheric Model version 5 (CanAM5) is the component of Canadian Earth System Model version 5 (CanESM5) which models atmospheric processes and coupling of the atmosphere with land and lake models. Described in this paper are the main features of CanAM5, with a focus on changes relative to the last major scientific version of the model (CanAM4). These changes are mostly related to improvements in radiative transfer, clouds, and aerosol parameterizations, as well as a major upgrade of the land surface and land carbon cycle models and addition of a small lake model. In addition to changes to parameterizations and models, changes in the adjustable parameters between CanAM4 and CanAM5 are documented. Finally, the mean climatology simulated by CanAM5 for the present day is evaluated against observations and compared with that simulated by CanAM4. Although many of the aspects of the simulated climate are similar between CanAM4 and CanAM5, there is a reduction in precipitation and temperature biases over the Amazonian basin, global cloud fraction biases, and solar and thermal cloud radiative effects, all of which are improvements relative to observations.</p

An instrumental perspective on apologizing in bargaining: the importance of forgiveness to apologize

Although very little research in bargaining has addressed how perpetrators should deal with the aftermath of unfair allocations, it has been proposed that an apology may help the reconciliation process. Prior research, however, only focused on whether apologies can reveal positive effects on the reconciliation process but did not focus yet on whether perpetrators are actually willing to apologize. In this paper we investigate perpetrator’s willingness to apologize for a trust violation in a bargaining setting. We hypothesized that perpetrators willingness to apologize would be a function of the extent to which the victim of the trust violation is willing to forgive. This effect, however, was expected to emerge only among those perpetrators who are low in dispositional trust. The results from a laboratory study with actual transgressions and actual apologetic behavior supported our predictions and thus emphasize an instrumental view on apologizing in bargaining situations

The apology mismatch: asymmetries between victim's need for apologies and perpetrator's willingness to apologize

Although previous research on apologies has shown that apologies can have many beneficial effects on victims’ responses, the dyadic nature of the apology process has largely been ignored. As a consequence, very little is known about the congruence between perpetrators’ willingness to apologize and victims’ willingness to receive an apology. In three experimental studies we showed that victims mainly want to receive an apology after an intentional transgression, whereas perpetrators want to offer an apology particularly after an unintentional transgression. As expected, these divergent apologetic needs among victims and perpetrators were mediated by unique emotions: guilt among perpetrators and anger among victims. These results suggest that an apology serves very different goals among victims and perpetrators, thus pointing at an apology mismatch