We propose an algorithm called CReaM to incrementally maintain materialized aggregate views with user-defined aggregates in response to changes to the database tables from which the views are derived. We show that when the physical design of the underlying database is optimized, the time taken by CReaM to update an aggregate view is optimal.

Crowd work has emerged as a new form of digital gainful employment that changes the nature of work. However, an increasing number of people perform certain tasks in the crowd and start to identify with this work. In this paper, we outline our research in progress which is concerned with the effects of work characteristics in crowd work that have impact on the individual’s identification. Thus, ...

In this paper we show how design-level aspects can be used to develop high integrity systems. In our approach, a system designer must first identify the specific mechanisms required for high integrity systems. To support this activity we have developed an initial tabulation of different kinds of threats and the mechanisms used to prevent, detect, and recover from the related attacks and problem...