Souleymane Oumtanaga

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In a wireless sensor network, eliminating redundancies in area coverage in the deployment zone represents a major challenge where the stake is its lifetime increase. Current works dealing with this topic use different deterministic or probabilistic techniques for nodes redundancies check. In this paper, we propose a quasi-quadratic time distributed(More)
The DNSSEC protocol constitutes one of the solutions of DNS architecturepsilas security. Unlike the other solutions, it represents an extension of the standard DNS. However its deployment is not without difficulty. In this work, we emphasize some problems involved in the progressive deployment of DNSSEC, with the inherent risks in the use of public key(More)
Efficient reconfiguration of optical multicast trees in wavelength division multiplexing (WDM) networks is required. Multimedia applications which consume a huge bandwidth, require multicasting. So, multicast concept is extended to optical networks to improve performance. Today, networks are facing many phenomena such as changes in the traffic model,(More)
Today, operators use reconfiguration to improve the performance of connection oriented networks. In our previous work, we studied tree reconfiguration without data flow interruption in wavelength division multiplexing optical networks. In our previous approach, the available resources of the network (wavelengths) are not considered as limited. In this work,(More)
In this article, we focus on conflict management when learning traditional medicine. The traditional medicine is involved in almost all diseases that man can encounter using natural products from plant, mineral, animal. The aim is to lay a solid diagnosis in order to implement an effective treatment and minimize the risk of physical and social imbalance of(More)
Multicast transmissions allow an host (the source) to send only one flow bound for a group of hosts (the receivers). Any equipment eager to belong to the group may explicitly register itself to that group via its multicast router. This router will be given the responsibility to convey all information relating to the group to all registered hosts. However in(More)
Dynamic spectrum access is a promising technique to use spectrum efficiently. Without being restricted to any prefixed spectrum bands, nodes choose operating spectrum on demand. Such flexibility, however, makes efficient and fair spectrum access in large scale networks great challenge. This paper presents a dynamic spectrum access decentralized approach.(More)
The third generation (3G) of cellular system adopted the spread spectrum as solution for the transmission of the data in the physical layer. Contrary to systems IS-95 or CDMAOne (systems with spread spectrum of the preceding generation), the new standard, called Universal Mobil Telecommunications System (UMTS), uses long codes in the down link. The system(More)