Dimitrios Koukopoulos

TL;DR: The proposed access control model preserves the advantages of scaleable security administration that RBAC-style models offer and yet offers the flexibility to specify complex access restrictions based on the semantic content of the images, the attributes of the user accessing the image, the relationship between the user and the patient whose images are to be accessed and the time.

TL;DR: This paper shows a graph for which FIFO is stable for any adversary with injection rate r ≰ 0.1428 and generalizes this results to show upper bound for stability of any network under FIFo protocol, answering partially an open question.

TL;DR: This chapter analyses the opportunities and characteristics of such transcription projects and describes a transcription user interface tool, which allows the user to adapt and personalize a user interface to transcribe the document contents, while obtaining an XML file to be stored in some database management system or to be shared among genealogists.

TL;DR: This work improves the state-of-the-art instability bound induced by certain known forbidden subgraphs on networks running a certain greedy protocol, and sheds more light and contributes significantly to a finer understanding of the impact of structural parameters on stability and instability properties of networks.

TL;DR: This work focuses on a basic adversarial model for packet arrival and path determination for which the time-averaged arrival rate of packets requiring a single edge is no more than 1, and discovers that the composition of any two protocols among SIS, NTS and FTG is universally stable.