Lambros Sarakis

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The majority of research and development efforts in the area of Wireless Sensor Networks (WSNs) focus on WSN systems that are dedicated for a specific application. However, this trend is currently being replaced by resourcerich WSN deployments that are expected to provide capabilities in excess of any application’s requirements. In this regard, the concept(More)
The diversity of applications that current and emerging Wireless Sensor Networks (WSNs) are called to support imposes different requirements on the underlying network with respect to delay and loss, while at the same time the WSN imposes its own intricacies. The satisfaction of these requirements highly depends on the metric upon which the forwarding routes(More)
This paper presents the architecture of the VITRO system concept developed under the VITRO project for the realization of Virtual Sensor Networks. The aim of the proposed architecture is to enable the realization of scalable, flexible, adaptive, energy-efficient and trust-aware Virtual Sensor Network platforms, focusing on the reduction of deployment(More)
The use of Wireless Sensor Networks (WSN) in a wide variety of application domains has been intensively pursued lately while Future Internet designers consider WSN as a network architecture paradigm that provides abundant real-life real-time information which can be exploited to enhance the user experience. The wealth of applications running on WSNs imposes(More)
The integration of Wireless Sensor Networks (WSNs) in the Future Internet has opened new opportunities for novel applications that meet the needs of modern societies. Virtualisation of the available resources and the services offered by WSNs enables their efficient sharing between diverse applications reducing costs. Responding to this challenge, the VITRO(More)
The key enabling function for seamless mobility and service continuity among a variety of wireless access technologies is the handover. Handovers within the same radio system are addressed by the standardization bodies involved in the development of the corresponding technologies (e.g., 3GPP, 3GPP2, IEEE, DVB), while handovers between heterogeneous systems(More)
During the last decades Intelligent Transportation Systems (ITS) have been attracting the interest of an increasing number of researchers, engineers and entrepreneurs, as well as citizens and civil authorities, since they can contribute towards improving road transport safety and efficiency and ameliorate environmental conditions and life quality. Emerging(More)
The availability of multiple collocated wireless networks and the multi-radio capabilities of contemporary wireless terminals open the potential for optimized wireless connectivity over the heterogeneous wireless environment. Vertical Handover (VHO) operations play a central role in such a setting, enabling the dynamic association of wireless users with the(More)
Wireless Sensor Networks (WSNs) often need to operate under strict requirements on energy consumption and be capable of self-adapting to the presence of non-trusted nodes which do not fully cooperate in the packet forwarding operation. In such an environment, the mechanism employed for the calculation of routing paths of minimum cost in terms of the number(More)