Konstantinos Birkos

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In this work we present an obstacle-aware human mobility model for ad hoc networks. Typical examples where the nodes of mobile ad hoc networks are human-operated are natural or man-made disasters, military activities or healthcare services. In these scenarios, obstacles are an integral part of the areas where such networks are deployed in order to(More)
1570-8705/$ see front matter 2011 Elsevier B.V doi:10.1016/j.adhoc.2011.07.012 ⇑ Corresponding author at: Department of Elec Engineering, University of Patras, Greece. E-mail address: xpapageo@ceid.upatras.gr (C. Pa In this paper we present a mobility model for ad hoc networks consisting of humanoperated nodes that are deployed in obstacle-constrained(More)
In this paper we present a mobility model for ad hoc networks operating in mission critical situations, like for example natural or man-made disasters, military activities or emergency healthcare services. The proposed model captures the properties of mobility in situations like the above by incorporating hierarchical node organisation, typical for such(More)
This paper describes the ROMEO architecture for live 3D multi-view video delivery over peer-to-peer networks. The scope of the European founded Integration Project ROMEO encompasses addressing the challenges of live multiview video delivery over heterogeneous networks (WiFi, LTE, DVB, etc.) and diverse user equipment (mobile, portable, fixed). In order to(More)
This paper proposes a dynamic trust establishment protocol that enables the nodes of an ad hoc network to establish security associations among each other in a distributed and peer-to-peer manner. The basis of the protocol is a node-to-node security handshake using a network-wide key that every node is preconfigured with. This way a security association is(More)
Scalable video enables flexible video delivery over IP networks. The adaptation of the video content to the network configuration and the networking conditions is the great advantage of scalable video. In this research work, on-demand H.264 SVC video delivery over wireless multi-hop single-frequency networks is studied. The main objective is to achieve the(More)
This paper aims to identify open challenges and propose the future steps towards establishing QoE driven media aware clouds. Cloud computing emerges as technology that allows access to resources over the Internet, transparently and independently of the underlying infrastructure. This study identifies the research challenges that future media-aware cloud(More)
This paper presents a case study of a Wi-Fi system operating in the frequency of 2.4 GHz. Two certain types of WLAN environments are examined: a home environment (typical residence) and a complex office environment. Experimental acquired data, for both single floor and multiple floor scenarios, are compared with the theoretical values provided by an(More)