Trois scénarios pour l'avenir du travail

Après avoir rappelé l'histoire longue du concept de travail et les différentes significations attachées au terme au cours des siècles, l'auteure analyse le rapport des Européens à cette valeur, ainsi que les conséquences sur le travail et l'emploi du discours en vogue sur la révolution technologique et ses effets «inéluctables». Elle envisage ensuite l'avenir du travail à la lumière de trois scénarios, celui du «démantèlement du droit du travail», celui de la «révolution technologique» (qui postule la fin de l'emploi par l'automatisation) et celui de la «reconversion écologique», dernier modèle compatible avec l'impératif environnemental, mais aussi avec les attentes placées sur le travail et l'emploi.     

Numerical performance of block thresholded wavelet estimators

Usually, methods for thresholding wavelet estimators are implemented term by term, with empirical coefficients included or excluded depending on whether their absolute values exceed a level that reflects plausible moderate deviations of the noise. We argue that performance may be improved by pooling coefficients into groups and thresholding them together. This procedure exploits the information that coefficients convey about the sizes of their neighbours. In the present paper we show that in the context of moderate to low signal-to-noise ratios, this block thresholding approach does indeed improve performance, by allowing greater adaptivity and reducing mean squared error. Block thresholded estimators are less biased than term-by-term thresholded ones, and so react more rapidly to sudden changes in the frequency of the underlying signal. They also suffer less from spurious aberrations of Gibbs type, produced by excessive bias. On the other hand, they are more susceptible to spurious features produced by noise, and are more sensitive to selection of the truncation parameter.     

WebStress: A web interface to explore a multidatabase bibliographic corpus on occupational stress

A bibliographic study on a multidisciplinary subject, such as occupational stress, requires a multidatabase query facility. Given this, we searched eight databases belonging to different fields (medicine, psychology, etc.) and from different countries. Thus, more than 26000 references on occupational stress were gathered. A bibliographic corpus of this sort is unusable because of the heterogeneous format of the records and the number of duplicate entries. Considering the limitations of commercial programs, we have developed a system, called WebStress, for reformatting the data and removing duplicates. The huge number of references and the research needs of updating and searching have necessitated the addition of several other functions to WebStress. Therefore WebStress comprises a web interface that makes it possible to search the corpus with advanced features (using clustering, a specialized thesaurus on stress and Boolean queries). In addition to the usual bibliographic queries on a specific database such as Medline, WebStress provides bibliometric analysis of the corpus, which might contribute to a detailed analysis on occupational stress in order to highlight the networks of researchers and to find the main topics studied in this area. WebStress is not yet available to researchers in general. It is being further developed, and also permission needs to be obtained from the eight commercial bibliographic databases that it consults.     

Precision of Information,Sensational Information,and Self‐Efficacy Information as Message‐Level Variables Affecting Risk Perceptions

Studies that investigate how the mass media cover risk issues often assume that certain characteristics of content are related to specific risk perceptions and behavioral intentions. However, these relationships have seldom been empirically assessed. This study tests the influence of three message‐level media variables—risk precision information, sensational information, and self‐efficacy information—on perceptions of risk, individual worry, and behavioral intentions toward a pervasive health risk. Results suggest that more precise risk information leads to increased risk perceptions and that the effect of sensational information is moderated by risk precision information. Greater self‐efficacy information is associated with greater intention to change behavior, but none of the variables influence individual worry. The results provide a quantitative understanding of how specific characteristics of informational media content can influence individuals’ responses to health threats of a global and uncertain nature.     

Development of a two-dimensional scale for evaluating technologies in high-tech companies: An empirical examination

Based on a sample of 463 technology evaluations, this paper demonstrates empirically the conceptual split between “technological attractiveness” – which is outside of the control of the company and “technological competitiveness” – which is within the company's control. The 16 “technological attractiveness” criteria produced by the literature review gave a set of six different factors (62.5% of variance) depicting potential value. The 16 “technological competitiveness” criteria derived of the literature review were summarized with only four questions (58% of variance) depicting accumulated value. As such, this research shows that managers assess technologies on the basis of a limited set of criteria. These results have practical implications as they enable us to target technology audits to a more workable set of questions at the operational level.