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La cancel culture (culture de l'annulation) est depuis quelques années une pratique en ligne populaire, mais controversée. Souvent par milliers, les utilisateurs de réseaux sociaux se rassemblent pour dénoncer publiquement et tenter de minimiser la présence en ligne d’une personnalité publique ou d’une entreprise qu'ils jugent problématique, leur fureur atteignant parfois des sommets impressionnants. Considérant l'impact de cette pratique, nous nous sommes interrogées sur la manière dont elle est perçue et vécue par les personnes qui y participent. Cette étude exploratoire définit d'abord la culture de l'annulation à travers diverses modalités numériques et sociohistoriques, puis analyse les réponses de 19 individus ayant participé à des annulations en ligne. Ces étapes ont permis de découvrir pourquoi les gens décident « d’annuler » et d'explorer les expressions de leurs participations. Finalement, c'est surtout le désir de défendre leurs propres valeurs et les communautés marginalisées qui sont ressorties comme les principales motivations de leurs annulations. / Cancel culture has been a popular, but controversial online practice for the past few years. Often by thousands, social media users gather to publicly denounce and attempt to minimise the online presence of a public figure or company they deem problematic, their fury sometimes attaining impressive heights. Considering the impact of this practice, it is worth asking how it is perceived and experienced by the people concerned. This exploratory study first defines cancel culture through diverse digital and sociohistorical modalities, and then analyses the responses of 19 subjects who have participated in online cancellations. These steps served to discover exactly why people canceled and to explore the expressions of their participations. In the end, it was mostly the desire to stand up for their own values and for marginalized communities that stood out as their main motivators for canceling.

TITLE: Specificity of education social disadvantaged child SUMMARY: This thesis deals with familiarity and experience of teachers and the principal of special education stream with the integration of socially disadvantaged pupils. The work deals with the reputation of so-called "Common Education" in the professional community of teachers, special education teachers and other educational staff. It also deals with experienced teachers with the integration of these pupils. It also dedicates level of awareness about who is a disciple of underprivileged knowledge and methods that can help this integration. Finally, the work deals with the familiarity of an amendment to the Education Act no. 82/2015 and knowledge of individual impacts on working with the student. Furthermore, the work deals with the degree of acceptance of compulsory attendance in the final year of nursery school and the abolition of preparatory classes. Also, the work deals with the possibilities that offers teachers plan educational support. KEYWORDS: Common education, amendment 82/2015, inclusion, special education, social disadvantage, socially disadvantaged pupils, plan educational assistance, canceling preparatory classes.

Phased array feeds (PAFs) are a promising new technology for astronomical radio telescopes. While PAFs have been used in other fields, the demanding sensitivity and calibration requirements in astronomy present unique new challenges. This dissertation presents some of the first astronomical PAF results demonstrating the lowest noise temperature and highest sensitivity at the time (66 Kelvin and 3.3 m^2/K, respectively), obtained using a narrowband (425 kHz bandwidth) prototype array of 19 linear co-polarized L-band dipoles mounted at the focus of the Green Bank 20 Meter Telescope at the National Radio Astronomy Observatory (NRAO) in Green Bank, West Virginia. Results include spectral line detection of hydroxyl (OH) sources W49N and W3OH, and some of the first radio camera images made using a PAF, including an image of the Cygnus X region. A novel array Y-factor technique for measuring the isotropic noise response of the array is shown along with experimental measurements for this PAF. Statistically optimal beamformers (Maximum SNR and MVDR) are used throughout the work. Radio-frequency interference (RFI) mitigation is demonstrated experimentally using spatial cancelation with the PAF. Improved RFI mitigation is achieved in the challenging cases of low interference-to-noise ratio (INR) and moving interference by combining subspace projection (SP) beamforming with a polynomial model to track a rank 1 subspace. Limiting factors in SP are investigated including sample estimation error, subspace smearing, noise bias, and spectral scooping; each of these factors is overcome with the polynomial model and prewhitening. Numerical optimization leads to the polynomial subspace projection (PSP) method, and least-squares fitting to the series of dominant eigenvectors over a series of short term integrations (STIs) leads to the eigenvector polynomial subspace projection (EPSP) method. Expressions for the gradient, Hessian, and Jacobian are given for use in numerical optimization. Results are given for simulated and experimental data, demonstrating deeper beampattern nulls by 6 to 30dB. To increase the system bandwidth toward the hundreds of MHz bandwidth required by astronomers for a fully science-ready instrument, an FPGA digital backend is introduced using a 64-input analog-to-digital converter running at 50 Msamp/sec and the ROACH processing board developed at the University of California, Berkeley. International efforts to develop digital back ends for large antenna arrays are considered, and a road map is proposed for development of a hardware correlator/beamformer at BYU using three ROACH boards communicating over 10 gigabit Ethernet.