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In the present study two experiments are reported in which the subjects were presented on a computer screen with a two-dimensional line drawing that is perceived as a three-dimensionalobject (i.e. a cube). The cube could be seen as stationary, as rotating about the y-axis (Experiment 1A), or as rotating about the x-axis (Experiment 1B). The subject's attention was directed by a visual precue to a vertex of the cube. As the cube rotated, the precued location moved in viewer-centred co-ordinatesm, but the local feature of the cube that had been precued (i.e. a given vertex) did not move in object-centred co-ordinates. The imperative stimulus was presented at the precued location (valid trials) or at an uncued location (invalid trials). Precued and uncued locations were determined in object-centred coordinates. The subjects were required to signal detection of the imperative stimulus by pressing the space bar on the computer keyboard. There were also control conditions in which the procedure was identical, but the cube was not visible. When the cube was visible, valid trials were faster than invalid trials, regardless of whether it was seen as stationary or rotating. It was concluded that the subjects could allocate spatial attention in object-centred co-ordinates. There wer also indications that responses for invalid trials were faster when the imperative stimulus was presented on the same face as the precue than when it was presented on the opposite face

In this paper the notion of free form feature for aesthetic design is presented. The design of industrial products constituted by free form surfaces is done by using CAD systems representing curves and surfaces by means of NURBS functions, which are usually defined by low level entities that are not intuitive and require some knowledge of the mathematical language. Similarly to the feature‐based approach adopted by CAD systems for classical mechanical design, a set of high level modelling entities which provides commonly performed shape modifications has been identified. Particularly, the paper suggests a classification of the so‐called detail features for an aesthetic and/or functional characterization of predefined free form surfaces. Feature types are formally described by means of an analytical definition of the surface modification through deformation and elimination laws. A topological classification is then given according to the application domain of such laws. A further sub‐classification of morphological types is then suggested according to geometric properties of weak convexity and concavity for the resulting modified shape, leading to a taxonomy of simple free form features meaningful for aesthetic design.

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Résumé Les répercussions d’une libéralisation commerciale pour les femmes varient selon leurs caractéristiques socio-économiques, leurs secteurs d’emploi et les pays. Dans cet article, il s’agit d’évaluer si de tels effets sont bien saisis au moyen d’une matrice de comptabilité sociale (MCS) et d’un modèle d’équilibre général calculable (MEGC) traitant séparément les femmes et les hommes. Le modèle est appliqué au Bangladesh et à la Zambie pour montrer comment les différences dans les dotations factorielles, les caractéristiques du marché du travail et les normes socio-culturelles déterminent l’influence d’une libéralisation commerciale sur les inégalités entre les sexes. L’article compare également les résultats des simulations à ceux d’autres approches de la littérature économique sur les inégalités hommes-femmes, discute les apports et les limites des analyses en équilibre général et propose des pistes pour de futures recherches. Classification JEL : D58; J16; J22.