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- W40168637 abstract "In the realm of scheduling problems different sources of uncertainty can invalidate the solutions. In this paper we are concerned with the generation of high quality downlink schedules in a spacecraft domain in presence of a high degree of uncertainty. In particular, we refer to a combinatorial optimization problem called MARS EXPRESS Memory Dumping Problem (MEX-MDP), which arises in the European Space Agency program MARS EXPRESS. A MEXMDP consists in the generation of dumping commands for transferring the whole set of data from the satellite to the ground. The domain is characterized by several kinds of constraints such as, bounded on-board memory capacities, limited communication windows over the downlink channels, deadlines and ready times imposed by the principal investigators and different sources of uncertainty e.g., the amount of data generated at each scientific observation or the channel data rate. This work describes a reduction of the MEX-MDP to a Max-Flow problem, such that the problem has a solution when the maximum flow equates the total amount of data to dump. Based on this reduction, an iterative procedure is built to improve the robustness of a solution with respect to the utilization of the on-board memory. The underlying idea being that the lower are the peaks in memory utilization, the higher the ability of facing unexpectedly larger amount of data." @default.
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- W40168637 date "2004-01-01" @default.
- W40168637 modified "2023-09-27" @default.
- W40168637 title "A Max-Flow Approach for Improving Robustness in a Spacecraft Downlink Schedule" @default.
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