... revision of the time windows consists of two operations: ex panding,that is, increasing the window size by one time point, and shrinking, that is, decreasing the window size by one timepoint. The ... F. Silva, C. Intanagonwiwat, R. Govindan, D.Estrin, and D. Ganesan, “Building efficient wireless sensornetworks with low-level naming,” in Proceedings of the ACMSymposium on Operating Systems ... nodes s and s,letT and Tbe the trajectories of s and s of the time window W.ForbothT and T, thecollector node s computes θiat each time point ti(1 <i≤|W|) and put them into...