Bernard Cousin
Université de Rennes, IRISA, Faculty Member
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
In this paper, we investigate the splitter placement problem in an optical WDM network. The goal is to select a given number of MC nodes in the network such that the overall link cost of a multicast session is minimized. We present an... more
In this paper, we investigate the splitter placement problem in an optical WDM network. The goal is to select a given number of MC nodes in the network such that the overall link cost of a multicast session is minimized. We present an exact formulation in integer linear programming ( ILP ) to find a set of trees that connects a source to a set of destination nodes. Then, four algorithms based on network topology metrics are proposed to select a given number of MC nodes in the network such that the overall link cost of a multicast session is minimized. The efficiency of the proposed algorithms is verified by simulation results.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Les annees 1970, mais surtout les annees 1980, ont vu la consecration et l'explosion de l'infographie. Les trois principaux domaines concernes sont la CAO/DAO, l'imagerie et la generation d'images de synthese. Si la... more
Les annees 1970, mais surtout les annees 1980, ont vu la consecration et l'explosion de l'infographie. Les trois principaux domaines concernes sont la CAO/DAO, l'imagerie et la generation d'images de synthese. Si la CAO/DAO est arrivee a maturite avec l'apparition de normes internationales telles que GKS, PHIGS et CGM, le monde de l'image est aujourd'hui en plein essor. Avec l'avenement du multimedia dans les annees 1990 et 2000, viendra un ensemble de normes et de standards qui assieront l'image au sein d'autres medias. Nous decrivons dans cet article un systeme d'images numeriques reparti integre au systeme X (X Window System, MIT [MIT 85], [Scheiffler 86]). Ce systeme, SiriX, base sur les concepts du prototype ITAMEX [Lutmann 92], confere a X une nouvelle dimension multimedia: l'Image. Nous presentons les divers problemes lies a un tel systeme, en particulier ceux du transfert et de la visualisation d'images, fixes ou animees. N...
Research Interests:
Du fait de l'impact croissant de l'image dans l'informatique et de l'explosion des reseaux de communication, les applications informatiques necessitent de plus en plus le transfert et la visualisation d'images. Pour... more
Du fait de l'impact croissant de l'image dans l'informatique et de l'explosion des reseaux de communication, les applications informatiques necessitent de plus en plus le transfert et la visualisation d'images. Pour realiser ces applications, il faut posseder un service de transfert et de visualisation d'images numeriques. Le but de cet article est de decrire un nouveau service appartenant a la couche application du modele de reference OSI: ITAMEX. Ce service reunit ITAM (transport des donnees) et EX (extension du systeme X). Il s'integre parfaitement dans le monde des stations de travail graphiques sous UNIX, mais aussi sur de plus gros systemes, le tout faisant partie de systemes repartis interconnectes par des reseaux de communication. L'article presente les differentes possibilites d'integration d'ITAMEX dans l'environnement X (X Window System) et evoque les divers problemes qui sont ainsi souleves.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests: Computer Science, Probability, Integrated Optics, Computer Network, Failure Recovery, and 10 moreMulticast, Efficient Algorithm for ECG Coding, WDM Optical Networks, Optical fiber, Wavelength Division Multiplexing, Survivability, Network Topology, Blocking Probability, Resource Utilization, and Heuristic algorithm
Research Interests: Computer Science and MoD
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests: Computer Science, Radio Resource Management, Resource Allocation, Computer Network, Cellular Network, and 7 moreWireless Sensor and Mobile Adhoc Networks, Throughput, Efficient Resource Management in Cloud Computing, RRM, Electrical And Electronic Engineering, Fractional Frequency Reuse (FFR), and IET Communications
This document addresses numerous security problems which DHCPv6 could be a victim of. We believe DHCPv6 will be the configuration method of choice. Despite of this fact, we think we have to describe a number of security issues one must be... more
This document addresses numerous security problems which DHCPv6 could be a victim of. We believe DHCPv6 will be the configuration method of choice. Despite of this fact, we think we have to describe a number of security issues one must be aware of in case of using DHCPv6 in an open environment.