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Bluetooth Low Energy is unsuitable for COVID-19 contact tracing, say inventors
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Marco:
Near ultrasound is actually part of android compatibility test suite.

Knowing that should make it less interesting and more self evident.
Syntax Error:
How about good old fashioned 1990's style IRD? We wear an IR transceiver on our facemasks.

Seriously though, BLE contact tracing apps are reliant on data exchange after a BLE connection has been made between two devices. In practical terms, kein problem in a low density environment with few people, but what about walking through a high density (high risk) place like a crowded metro station? Is there enough time for devices to advertise, connect, exchange, hang up and repeat, when you're walking as quick as you can through the 'danger zone'? How many devices get missed?

btw I came across this informative primer on BLE Advertising, which is the core technology for most contact tracing apps. https://www.argenox.com/library/bluetooth-low-energy/ble-advertising-primer/
cdev:
How about a system where people are totally in control that doesnt connect up to anybody or anything else that merely warns them when somebody else is too close with an audio alarm.

No surveillance state anything. Dumb electronics only. using sound TDOA and with no means of offloading data.
SparkyFX:
(Near) Ultrasound/Sonar would circumvent the problems with EM-reception field strength indication vs. physical contact, but most people carry their phone in pockets, introducing lots of noise and dampening, making a distance measurement hard. And all this effort is thwarted by someone sneezing into his hand and touching a doorknob, or not for elderly or young kids.

This is why I think the approach to trace contacts and possible infections via smartphone is ill-fated, i doubt there is an advantage over the regional physical distancing rules indicated by test/amount of newly infected people. It would take time to crunch the data, make the decision and will probably affect as many people as to locally check by infection rate if measures for a whole area are needed. Both methods just follow what this virus is doing, but given the long incubation time only preventative methods could make an impact.

Psychologically i think rules work best when everyone is required to e.g. wear face masks, keep distance and such, not singling out subgroups.
cdev:
Quotas like that are being disputed as we speak, and indeed,  if India wins its case against the US the changes are binding on the entire world. Many businesses may lay off their old expensive employees and rush to get the newer cheaper ones. This may be why governments are suddenly so keen to keep track on people? 

the new arrangements are not being fair to anybody when they make the wages so low. (Even if now they are 'legal')


--- Quote from: blueskull on May 13, 2020, 06:45:49 am ---
--- Quote from: Red Squirrel on May 13, 2020, 06:24:23 am ---Companies should be required to keep at least a certain percentage like say, 80% of work work within the country.

--- End quote ---

Said from an old fashioned Westerner who failed to compete in, or should I say, with, the brave new world.

--- End quote ---

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