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This paper proposes a replication cost model and two greedy algorithms, named GS QoS and GS QoS C1, for replication placements in cloud-based storage systems. The model aims to minimize replication cost with full consideration of quality of user access to storage nodes. Our two algorithms employ a utility measurement to guide placement procedures. Our final experimental results show that 1) GS QoS...
The SMDO (Sliding Mode Disturbance Observer) is introduced in optimal attitude maneuver control law for high-precision attitude control of flexible spacecraft which consists of rigid central body and flexible appendages. First, an theta-D optimal attitude maneuver control law is adopted, then an SMDO is designed based on internal model principle. Furthermore, the attitude control system stability...
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