Monitoring Moving Queries inside a Safe Region

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="630396.fig.0011a" src="https://static.hindawi.com/articles/tswj/volume-2014/630396/figures/630396.fig.0011a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Different directions the query may follow</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="630396.fig.0011b" src="https://static.hindawi.com/articles/tswj/volume-2014/630396/figures/630396.fig.0011b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>The distance from the query to the border of the safe region by any direction</td></tr></table></td></tr></table>

<table>Distance that query can travel before the objects of interest change.</table>

The Scientific World Journal

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Figure 11

Figure 11: Monitoring Moving Queries inside a Safe Region 