University of Piraeus

About: University of Piraeus is a education organization based out in Piraeus, Attiki, Greece. It is known for research contribution in the topics: Context (language use) & Computer science. The organization has 1731 authors who have published 6209 publications receiving 106699 citations.

An innovation-based approach for coping with increasing complexity in the global economy

Abstract: The strategic differentiation usually needed to compete in the global economy introduces new complexity in a firm's internal and external environment, in the form of new players and new interactions. To cope effectively with such new complexity leadership must rely increasingly on innovations related to new products/services, to new business processes and to new business models. Two major categories of complexity refer to environmental complexity that affects strategic decisions on how to compete and operational complexity on how to solve the problems emerging in implementing a strategy. This paper explores methods to identify the various kinds of complexity present in both categories and a general approach to reduce it and optimise it, as a firm pursues the strengthening of its competitive advantage.

Social Networks as an Attack Platform: Facebook Case Study

Abstract: In this paper it is described how can a social network, like Facebook, be exploited and converted into an attack platform, in order to gain some sensitive data, which can complete a perfect attacking profile against a user. More specifically, we created a Facebook application for demonstration purposes that on the surface is a simple application, but on the background it collects useful data, making it easy to attack against the user with malicious programs, showing the risks that these platforms can expose their users to.

Signature and IFR Preservation of 2-Within-Consecutive $k$ -out-of- $n$ : $F$ Systems

Abstract: We prove some stochastic comparisons between reliability structures' lifetimes using their signatures. In the present article, we provide a signature-based analysis of a 2-within-consecutive-k-out-of-n: F system consisting of exchangeable components. More specifically, we deduce recurrence relations for evaluation of its signature, while an exact formula for the computation of the same quantities is also presented. In addition, we establish several stochastic ordering results for the 2-within-consecutive-k-out-of-n: F systems, and some stochastic comparisons between reliability structures' lifetimes using their signatures are proved. Finally, we investigate the IFR property preservation under the formulation of 2-within-consecutive-k-out-of-n: F systems, and deduce simple conditions under which the IFR property is not preserved.