Hervé Guyennet

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Wireless sensor networks are specific adhoc networks. They are characterized by their limited computing power and energy constraints. This paper proposes a study of security in this kind of network. We show what are the specificities and vulnerabilities of wireless sensor networks. We present a list of attacks, which can be found in these particular(More)
In this paper, we present a new contention access method for scalable wireless sensor networks. In these networks, the traffic levels are often variants, particularly in monitoring applications. Sensors do not regularly have much data to send. However, when an event occurs, every sensor in a given area will send its alert to the access point simultaneously.(More)
Prolonging network lifetime has become a real challenge in Mobile Wireless Sensor Networks (MWSNs) as sensors have limited energy. In this paper, we propose a Cluster-based Energy-efficient Scheme (CES) for electing a cluster-head to evenly distribute energy consumption in the overall network and therefore obtain a longer network lifetime. In CES, each(More)
Wireless sensor networks (WSNs) consist of a large number of tiny sensor nodes. Hence, a cluster-based architecture can be used to deal the self-organization issues of large networks. This cluster-based organization can prolong network lifetime and reduce broadcast overhead. In this paper, we propose an Efficient SelfOrganization Algorithm for Clustering(More)
In many applications, wireless sensor networks need to secure information. Actual researchs found efficient solutions for this kind of network, principally by using cryptography to secure the data transfer. However an encrypted information send by the network can be sufficient to preventan attacker, who eavesdrops the network, that somethingimportant has(More)
Standards such as CORBA are spreading in the development of large scale projects. However, CORBA lacks a mobility mechanism which is an interesting feature to deal with system dynamics. In this paper, we propose a generic solution for object mobility in CORBA in the framework of its lifecycle service. Implementation at the object level handles the migration(More)
Navigation aids for the pedestrians are considered new research challenges. The visually impaired are particularly concerned, because of their need to detect and avoid obstacles, as well as to orient themselves in unknown environments. In this paper, we discuss some existing projects in this domain and we propose a novel aid system formed of wireless(More)
The paper proposes an Efficient Cluster-based Self-organisation Algorithm (ECSA) for partitioning Wireless Sensor Networks (WSNs) into clusters, thus giving at the network a hierarchical organisation. Each sensor uses its weight based on its k-density and its residual energy to elect a cluster-head in its 2-hop neighbourhood. ECSA operates without a(More)