Anticiper ou temporiser : injonctions environnementales et recompositions des identités professionnelles en céréaliculture

Questions about the modernization of farming, given its environmental impact, are leading French farmers to rework their occupational identities. This is studied by comparing cereal growers who practice “integrated protection” — a form of agriculture that saves on input — with their “conventional” colleagues. Given the high degree of uncertainty about the standards that will be imposed, cereal farmers have adopted positions that contrast with regard to: the future (anticipating vs. stalling for time), “professional excellence” (whether or not to accept lower yields) and risks (whether to adopt strategies turned toward vigilance or toward insurance). The diffusion of innovative farming practices is limited owing to their lack of legitimacy, which leads farmers to explore the possibilities for obtaining legitimation from outside the profession.     

基于改进粒子群算法的神经网络优化证券投资组合方法

采用人工神经网络对证券投资进行预测与分析的研究过程中,提高神经网络各个节点参数的优化能力是极其关键的。传统的神经网络存在学习速度慢、易陷入局部极小值、预测结果精度较低等缺点,一种玫进型粒子群（Improved Particle Swann Optimizer,IPSO）算法．可以优化BP（Back Propagation）神经网络．并将优化后的BP神经网络应用于优化证券投资组合中。实验结果表明：该研究方法能够在预测精度和稳定性方面明显优于传统的PSO—BP神经网络优化证券投资组合方法。     

Learning-project structures in different work types: an empirical analysis

This study demonstrates that work-related learning projects can be organized using different structural arrangements. Sixteen learning projects conducted by ninety-six participants in three different work types were analysed and compared both qualitatively and quantitatively. No evidence was found for the claim that learning-project structures necessarily depend on the type of work in which they are carried out. However, two distinct combinations of learning project structure and work type did not emerge. It is concluded that actors have organizational choice in organizing learning projects, but their options are less likely to be realized if the learning-project type is very different from the worktype.     

‘There's a huge gulf between me as a male carer and women': Gender,domestic responsibility,and the community as an institutional arena

This paper explores the persistent link between women and domestic responsibility, a link that has been heavily documented and yet much less frequently theorised. Drawing on a qualitative research project with a 'critical case' study sample of couples trying to share housework and childcare in Britain in the early 1990s the paper argues that part of this puzzle linking women and domestic responsibility can be addressed by adopting wider definitions of domestic responsibility and of community. While domestic responsibility is often conceived as family labour that occurs within families/households, it also has inter-household, inter-institutional and community dimensions. With regard to a wider conceptualisation of the community, the paper argues that the community is more than a social institution; it is an institutional arena within which families/households, inter-household relations, community-based social networks and a wide array of community activities occur. The overall findings and implications of the research presented in this paper are three-fold. First, gendered socially constructed norms and gendered community-based social networks are highlighted as important factors that help to account for the persistent link between women and domestic responsibility. Second, taking cues from research carried out in Third World and low-income Western communities, it is important to shift research agendas on domestic divisions of labour to focus not only on intra-household divisions but also inter-household and intra-community relations. Third, the need is highlighted for greater attention to the links between socially constructed norms on masculinities, men's friendships and domestic responsibility. Este articulo explora la conexión persistente entre las mujeres y la responsabilidad doméstica. Se ha documentado mucho veces esta conexión pero se ha teorizado muy pocas veces. Se hace uso de una investigación cualitativa con un estudio tipo 'caso crítico' del cual proviene una muestra de parejas que intentan compartir las tareas domésticas y el cuidado de los niños, y se sostiene que se puede tratar parte de este enigma que une a las mujeres con la responsabilidad doméstica si se adoptan unas definiciones mas amplias de la responsabilidad doméstica y de la comunidad. Mientras que a menudo se suele concebir la responsabilidad doméstica como trabajo familiar que tiene lugar dentro de las familias/los hogares, también tiene dimensiones inter-hogares, inter-institucionales y comunitarias. Con respecto a una conceptualización mas amplia de la comunidad, este artículo sostiene que la comunidad es más que una institución social; es un ruedo institucional (Goetz, 1997) dentro del cual se encuentran las familias/los hogares, las relaciones inter-hogares, las redes sociales basadas en la comunidad y una amplia gama de actividades comunitarias. Tienen tres aspectos las conclusiones e implicaciones globales que se presentan en este artículo. Primero, se ponen de relieve las connotaciones de género, que se evidencian en las normas sociales y en las redes sociales basadas en la comunidad, como factores importantes que ayudan a explicar la conexión persistente entre las mujeres y la responsabilidad doméstica. Segundo, es importante seguir el ejemplo de investigaciones realizadas en el tercer mundo y en las comunidades occidentales de bajos ingresos, y cambiar el enfoque de las investigaciones de las divisiones domésticas del labor para centrarse no sólo en las divisiones entre el hogar sino también en las relaciones entre los hogares y entre la comunidad. Tercero, realzo la necesidad de prestar mas atencion a los vínculos entre las normas sociales sobre las masculinidades, las amistades entre los hombres y la responsabilidad doméstica.     

Complexity and Adaptivity in Supply Networks: Building Supply Network Theory Using a Complex Adaptive Systems Perspective*

Supply networks are composed of large numbers of firms from multiple interrelated industries. Such networks are subject to shifting strategies and objectives within a dynamic environment. In recent years, when faced with a dynamic environment, several disciplines have adopted the Complex Adaptive System (CAS) perspective to gain insights into important issues within their domains of study. Research investigations in the field of supply networks have also begun examining the merits of complexity theory and the CAS perspective. In this article, we bring the applicability of complexity theory and CAS into sharper focus, highlighting its potential for integrating existing supply chain management (SCM) research into a structured body of knowledge while also providing a framework for generating, validating, and refining new theories relevant to real‐world supply networks. We suggest several potential research questions to emphasize how a CAS perspective can help in enriching the SCM discipline. We propose that the SCM research community adopt such a dynamic and systems‐level orientation that brings to the fore the adaptivity of firms and the complexity of their interrelations that are often inherent in supply networks.     

Tracking phantastic objects: A computer algorithmic investigation of narrative evolution in unstructured data sources

We develop social network and “relative sentiment shift” analysis techniques to study how financial narratives influence financial markets. First, we analyze Reuters News articles focusing on narratives about Fannie Mae. Second, we analyze Broadband and Energy narratives in the Enron Corporation email database. Combining datasets we show that phantastic object narratives can be detected and tracked as they develop and spread through networks to lead to a disconnect between narrative and underlying “reality”. The methods may be applicable to other text datasets to create early warnings.     

A neural network clustering model for miscellaneous components production planning

The growing importance of providing service to customers, e.g. post-sale assistance, supplying of spare parts, upgrading and integration of new elements in installed systems, enhances the importance of planning and management of upgrading parts in most manufacturing industries. These parts are generally characterized by high technical heterogeneity and have a highly variable and difficult to forecast demand. In some areas (especially the most dynamic, e.g. high-tech products), these kinds of components are quite common, and represent a very strong relation between the manufacturing firm and the market. These parts are generally too many to be efectively supported on a planning database system with individual records and too heterogeneous ( and sometimes with a too high value) to be supported all together in a single record. In this paper, we want to study the application of adaptive techniques for the clustering of these components in classes based on the similarities in their market behaviour in order to build an optimal database for planning production and supplying of these components.     

Applications of Community Informatics for Building Community and Enhancing Civic Society

Community informatics provides new ways of approaching old problems of community development and enhancing civic society. Building on a theoretical analysis, this article discusses research in the area of the efforts of community networks in the USA to achieve outcomes in these two areas using the tools of community telecommunications and networking. The analysis matches the theoretical arguments for how community building and civic society are achieved against the practice of community networks trying to implement the new communications technologies. The analysis shows that achieving these goals is difficult for community information networks and that a full understanding of the nature of community information infrastructures could likely be very helpful in this task.