86,842 research outputs found
Coping strategies in adaptation to cancer of partner: First results of ways of coping-cancer version{'}s validation,Strategie di coping nell{'}adattamento allamalattia oncologica del coniuge: Primi risultati dellavalidazione del ways of coping-cancer version
No full textNel lavoro è descritta la validazione italiana del Ways of Coping Inventory-Cancer Version (Dunkel-Schetter et. al.) per coniugi di pazienti affetti da cancro. Il questionario, nella sua versione italiana, articola il costrutto in quattro dimensioni o fattori interrelati: Ricerca di informazioni ed uso del sostegno sociale, Distanziamento, Evitamento cognitivo e comportamentale, Focalizzazione sul positivo. Lo studio presentato ha valutato l’attendibilità e la validità del WOC-CA in un campione composto da mariti di donne affette da cancro (N=156). Le dimensioni del WOC-CA dimostrano inoltre una adeguata attendibilità interna e una buona validità concorrente e divergente con l’SCL-90 e con il Social Provision Scale. Il presente studio incoraggia l’uso del questionario WOC-CA per scopi sia clinici che di ricerca
Multiresolution MAP Despeckling of SAR Images Based on Locally Adaptive Generalized Gaussian pdf Modeling
No full textIn this paper, a new despeckling method based on undecimated wavelet decomposition and maximum a posteriori (MAP) estimation is proposed. Such a method relies on the assumption that the probability density function (pdf) of each wavelet coefficient is generalized Gaussian (GG). The major novelty of the proposed approach is that the parameters of the GG pdf are taken to be space-varying within each wavelet frame. Thus, they may be adjusted to spatial image context, not only to scale and orientation. Since the MAP equation to be solved is a function of the parameters of the assumed pdf model, the variance and shape factor of the GG function are derived from the theoretical moments, which depend on the moments and joint moments of the observed noisy signal and on the statistics of speckle. The solution of the MAP equation yields the MAP estimate of the wavelet coefficients of the noise-free image. The restored SAR image is synthesized from such coefficients. Experimental results, carried out on both synthetic speckled images and true SAR images, demonstrate that MAP filtering can be successfully applied to SAR images represented in the shift-invariant wavelet domain, without resorting to a logarithmic transformatio
MAP Despeckling of SAR Images Based on Local PDF Modeling in the Undecimated Wavelet Domain
No full textSegmentation-Based MAP Despeckling of SAR Images in the Undecimated Wavelet Domain
No full textIn this paper, a novel despeckling algorithm based on undecimated wavelet decomposition and maximum a posteriori estimation is proposed. Such a method represents an improvement with respect to the filter presented by the authors, and it is based on the same conjecture that the probability density functions (pdfs) of the wavelet coefficients follow a generalized Gaussian (GG) distribution. However, the approach introduced here presents two major novelties: 1) theoretically exact expressions for the estimation of the GG parameters are derived: such expressions do not require further assumptions other than the multiplicative model with uncorrelated speckle, and hold also in the case of a strongly correlated reflectivity; 2) a model for the classification of the wavelet coefficients according to their texture energy is introduced. This model allows us to classify the wavelet coefficients into classes having different degrees of heterogeneity, so that ad hoc estimation approaches can be devised for the different sets of coefficients. Three different implementations, characterized by different approaches for incorporating into the filtering procedure the information deriving from the segmentation of the wavelet coefficients, are proposed. Experimental results, carried out on both artificially speckled images and true synthetic aperture radar images, demonstrate that the proposed filtering approach outperforms the previous filters, irrespective of the features of the underlying reflectivit
Strategie di coping nell’adattamento alla malattia oncologica del coniuge: primi risultati della validazione del Ways of Coping- Cancer version.
No full textGirls' Math Performance Under Stereotype Threat: The moderating role of mothers' gender stereotypes
No full textPrevious research on stereotype threat in children suggests that making gender identity salient disrupts
girls’ math performance at as early as 5 to 7 years of age. The present study (n 124) tested the
hypothesis that parents’ endorsement of gender stereotypes about math moderates girls’ susceptibility to
stereotype threat. Results confirmed that stereotype threat impaired girls’ performance on math tasks
among students from kindergarten through 2nd grade. Moreover, mothers’ but not fathers’ endorsement
of gender stereotypes about math moderated girls’ vulnerability to stereotype threat: Performance of girls
whose mothers strongly rejected the gender stereotype about math did not decrease under stereotype
threat. These findings are important because they point to the role of mothers’ beliefs in the development
of girls’ vulnerability to the negative effects of gender stereotypes about math
Influence minoritaire et effet de décentration dans l'argumentation: une approche expérimentale
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