Since networks and computing systems are vital components of today's life, it is of utmost importance to endow them with the capability to survive physical and logical faults, as well as malicious or deliberate attacks. When the information system is obtained by federating pre-existing local systems, a methodology is needed to integrate security policies and mechanisms under a uniform structure...

Unemployment insurance is an important social protection policy that buffers unemployed workers against poverty and poor health. Most unemployment insurance studies focus on whether increases in unemployment insurance generosity are predictive of poverty and health outcomes. Less work has used theory-driven approaches to understand and explain how and why unemployment insurance works, for whom,...

We conducted a two-part study to understand the impact of authenti-cation on employees’ behaviour and productivity in a US governmental organi-sation. We asked 23 participants to keep a diary of all their authentication events within a 24-hour period, and subsequently interviewed them about their experience with authentication. We found that the authentication tasks employees have to perform no...

Recent efforts to design and develop Cloud technologies focus on defining novel methods, policies and mechanisms for efficiently managing Cloud infrastructures. One key challenge potential Cloud customers have before renting resources is to know how their services will behave in a set of resources and the costs involved when growing and shrinking their resource pool. Most of the studies in this...

Arguably, the main goal of Grid Computing is to facilitate the creation of Virtual Organizations (VOs); however, to date, not enough attention has been placed on the policies and mechanisms by which these VOs will operate. The core of the VO--roughly, the responsibility of each Physical Organization (PO) in the VO to contribute and not unjustly consume resources in achieving the overall goal of...

Increasingly heterogeneous and hierarchical parallel architectures are now mainstream, however, most of the traditional programming models are lowlevel and explicit, limiting portability, scalability, and productivity. Moreover, performance of applications that overspecify evaluation degree and order will suffer as they fail to adapt to changing architectures. This paper surveys the properties,...