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Wi-Fi signals can now help counting people in a crowd

05:51 PM | 9 Jun, 2015
Wi-Fi signals can now help counting people in a crowd

ISLAMABAD (APP) - Wi-Fi signal can be used to count the number of people in a given space, leading to diverse applications such as energy efficiency to search-and-rescue operations.

Researchers from University of California-Santa Barbara have shown that wireless signals can do more than just providing internet access.

"Our approach can estimate the number of people walking in an area, based on only the received power measurements of a Wi-Fi link," said Yasamin Mostofi, professor of electrical and computer engineering.

This approach does not require people to carry Wi-Fi-enabled devices for them to be counted. To accomplish this feat of people-counting, the researchers put two Wi-Fi cards at opposite ends of a target area, Medical Xpress reported.

Using only the received power measurements of the link between the two cards, their approach can estimate the number of people walking in that area. So far, they have successfully tested with up to nine people, including in both indoor and outdoor settings.

The presence of people attenuates the signal in the direct line of sight between the Wi-Fi cards if a person crosses the line of sight.

Human bodies also scatter the signal -- resulting in a phenomenon called multi-path fading -- when they are not in the direct line of sight path.

By developing a probabilistic mathematical framework based on these two key phenomena, the researchers have then proposed a way of estimating the number of people walking in the space.

The ability to estimate the number of people in a given space could be used in smart homes and buildings, so air conditioning and heating could be adjusted according to the level of occupancy.

The author is working as Editor Digital Media for Daily Pakistan and can be reached @ItsSarfrazAli.

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Rupee exchange rate to US Dollar, Euro, Pound, Dirham, and Riyal - 28 Feb 2024

Pakistani currency remains momentum against US dollar in the open market on February 28, 2024 (Wednesday).

US Dollar rate in Pakistan

In the open market, the US dollar moves up and currently hovers at 282 for buying and 282.25 for selling.

Euro currently stands at 303.1 for buying and 306.1 for selling while British Pound rate stands at 351.6 for buying, and 355.1 for selling.

UAE Dirham AED hovers at 76.1 whereas the Saudi Riyal saw slight increase, with new rates at 74.25.

Today’s currency exchange rates in Pakistan - 28 Feb 2024

Source: Forex Association of Pakistan. (last update 09:00 AM)
Currency Symbol Buying Selling
US Dollar USD 282 282.25
Euro EUR 303.1 306.1
UK Pound Sterling GBP 351.6 355.1
U.A.E Dirham AED 76.1 76.8
Saudi Riyal SAR 74.25 75.05
Australian Dollar AUD 181.1 183.1
Bahrain Dinar BHD 742.91 750.91
Canadian Dollar CAD 207.1 209.1
China Yuan CNY 38.87 39.27
Danish Krone DKK 40.61 41
Hong Kong Dollar HKD 35.75 36.1
Indian Rupee INR 3.37 3.48
Japanese Yen JPY 2.10 2.18
Kuwaiti Dinar KWD 905.46 914.46
Malaysian Ringgit MYR 58.5 59.1
New Zealand Dollar NZD 173.05 175.05
Norwegians Krone NOK 26.41 26.71
Omani Riyal OMR 725.54 733.54
Qatari Riyal QAR 76.74 77.44
Singapore Dollar SGD 207.15 209.15
Swedish Korona SEK 27.04 27.34
Swiss Franc CHF 317 319.5
Thai Bhat THB 7.76 7.91

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