A Real-Time Location-Based Services System Using WiFi Fingerprinting Algorithm for Safety Risk Assessment of Workers in Tunnels

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="371456.fig.007a" src="https://static.hindawi.com/articles/mpe/volume-2014/371456/figures/371456.fig.007a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>One tunnel view</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="371456.fig.007b" src="https://static.hindawi.com/articles/mpe/volume-2014/371456/figures/371456.fig.007b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>WiFi AP</td></tr></table></td></tr><tr class="fig-image" id="c"><td><img alt="371456.fig.007c" src="https://static.hindawi.com/articles/mpe/volume-2014/371456/figures/371456.fig.007c.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(c) </b>Wireless base station</td></tr></table></td></tr></table>

<table>A snapshot of RTLS devices in tunnel site.</table>

Mathematical Problems in Engineering

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Figure 7

Figure 7: A Real-Time Location-Based Services System Using WiFi Fingerprinting Algorithm for Safety Risk Assessment of Workers in Tunnels 