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

Figure 7

The comparison of the nDC and 𝑑 and 𝑁 are varied related to Experiment 3.

(a) nDC as 𝑑 is varied (𝑁=10K)

(b) nDC as 𝑑 is varied (𝑁=100K)

(c) nDC as 𝑑 is varied (𝑁=1000K)