Grid-PPPS: A Skyline Method for Efficiently Handling Top-𝑘 Queries in Internet of Things

Figure 4

The comparison of the computing time and nDC as 𝑁 is varied related to Experiment 1.

(a) Computing time as 𝑁 is varied (𝑑=8)

(b) nDC as 𝑁 is varied (𝑑=8)