[eng] This paper can be related with the field of network externalities and increasing returns of adoption. We present the foundations of an approach and a model able to take in account the influence of effective relationship between agents onto the adoption-diffusion process of an innovation or...

[eng] While adopting an approach of innovation diffusion in terms of interacting agents, we emphasise the role of cumulated influence in the context of social networks. We first introduce a cumulative effect in the classical epidemic model which involves a slower starting phase followed by a...

[eng] In this paper the evolution of networks is studied in an environment where innovation takes place as a resuit of agents bringing together their knowledge endowments. Agents freely form pairs that must constitute a stable matching in which the rankings are made on the basis of the...

[eng] The role of social networks in innovation diffusion remains a strategic question. In former works, we have introduced a relational learning, based on hebbian rule, that leads to a critical state, in which few agents reach structural positions of opinion leaders. In this paper, we show that...

[eng] Electronics are a worlwide market led by multinational corporations. Their strategies are determined by the specificities of their home markets.. US groups have built their international growth through foreign direct investment. Japanese Corporations have given preference to exports....

[fre] L'article s'attache en premier lieu à préciser la spécificité de l'industrie du traitement de l'information à l'égard du concept de grappe technologique. Le cas d'Olivetti, examiné ensuite, depuis son redressement spectaculaire à partir de 1978, présente-t-il pour l'industrie...