In all market segments, social networking sites (SNS) have to be considered an element of value-adding for business, mainly through the possibility of promoting closer interactions between organisations and their customers. Despite this, the main concern is still what is being said on SNS. From this perspective, beyond the diversity of interaction patterns, there are several extra tools (the ma...

In this paper we apply dimensional analysis (D.A.) to two cosmological models: Einsteinde Sitter and one Friedmann-Robertson-Walker (FRW) with radiation predominance. We believe that this method leads to the simplest form of solution the differential equations that arise in both models and would be useful as a base for the solution of more complex models. The aim of the paper is therefore rathe...

In this paper we deene a probabilistic testing semantics which can be used to alternatively characterize fair testing. The key idea is to deene a probabilistic semantics in such a way that two non-probabilistic processes are fair equivalent ii any probabilistic version of both processes are equivalent in our probabilistic testing semantics. In order to get this result we deene a simple probabil...

We examine the impact of employee turnover on operating performance in settings that require high levels of knowledge exploitation. Using 48 months of turnover data from U.S. stores of a major retail chain, we find that, on average, employee turnover is associated with decreased performance, as measured by profit margin and customer service. The effect of turnover on performance, however, is mi...