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This paper considers the problem of aggregating several multicast sessions. A multicast session is defined as a subset of clients requiring the same information. Besides, each client can require several multicast sessions. A telecommunication network cannot manage many multicast sessions at the same time. It is hence necessary to group the sessions into a(More)
This paper deals with the problem of ÿnding a minimum cost schedule for a set of dependent activities when a convex cost function is attached to the starting time of each activity. A ÿrst optimality necessary and suucient condition bearing on the head and tail blocks of a schedule is ÿrst established. A second such condition that uses the spanning active(More)
This paper considers the problem of scheduling a tree-structured task system in a distributed environment with the goal of minimizing the makespan. Interprocessor communication delays are taken into account and task duplication is allowed. Furthermore, it is assumed that the number of processors is unlimited. It is shown that there is a polynomial-time(More)