In this chapter we present recent contributions in the field of sequential job scheduling on network machines which work in parallel; these are subject to temporary unavailability. This unavailability can be either unforeseeable (online models) or known a priori (offline models). For the online models we are mainly interested in preemptive schedules for problem formulations where the machine un...

This paper surveys existing enterprise technologies that control access to confidential digital data, and analyzes the impact of system and staff unavailability on the obtained security. The researched technologies allow restrictions to be placed on copying, editing, viewing and printing from within various software applications, provide auditing options and prevent outsider access through encr...

Cloud storage multi-homing (a.k.a. as multicloud) represents a possible solution to achieve enhanced availability of one’s own data and build an extremely reliable cloud environment out of relatively unreliable single cloud platforms. However, subscribing with multiple cloud providers comes at a cost. The cost of multiple subscriptions must be compared against the damage resulting from the poss...

In Brazil, power generating, transmitting and distributing companies operating in the regulated market are paid for their equipment availability. In case of system unavailability, the companies are financially penalized, more severely, on unplanned interruptions. This work presents a domain driven data mining approach for estimating the risk of systems’ unavailability based on their component e...

In this paper we provide efficient robust algorithms for shunting problems concerning the reordering of train cars over a hump. In particular, we study algorithms able to cope with small disruptions, as temporary and local unavailability and/or malfunctioning of key resources that can occur and affect planned operations. To this aim, a definition of robust algorithm is provided. Performances of...

Understanding object and its context are very important for robots when dealing with objects for completion of a mission. In this paper, an Affordance-based Ontology (ABO) is proposed for easy robot dealing with substantive and non-substantive objects. An ABO is a machine-understandable representation of objects and their relationships by what it’s related to and how it’s related. By using ABO,...