Domain: ce-mag.com
Stories and comments across the archive that link to ce-mag.com.
Comments · 8
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Requirements for OR Electronics
"Among the possible uses for Google Glass that early adopters are dreaming up, you can now add 'surgical assistance' to the list. With approval from the institutional review board, a UCSF cardiothoracic surgeon recently utilized Glass during procedures
..."I have been involved with getting electronics into operating rooms, and it is an expensive, complicated and time consuming process. FDA requirements apply to all medical devices; with RFI being a big problem, especially in an OR environment (which is full of "mission critical" electronic gear). To be blunt, if Google glass interferes with the electronics already in the OR, patients could die, and everyone involved with getting it there would be directly responsible.
From my perspective, the note-worthy thing about this story would be getting the certification needed to take Google Glass into the OR, as that would probably be the hardest thing to do, much harder than some trivial HIPAA scrubbing, and it puzzles me that that is not mentioned in the article. So, I have to wonder, did they actually do this, or is Google and UCSF just winging it and hoping no one dies during their trials?
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Re:Anyone have any idea how it works?
I'll guess:
First thing that comes to mind is "ion wind". As air ions are usually for the most part consisting of clusters of water molecules, ion wind should have cooling effect. The second thing is repelling the oxygen by electrifying the flames with negative charge. However, TA mentions "waves", so perhaps it is all about inducing instability, breaking the convective circulation, dispersing the flames to lower the temperature bellow ignition point
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Bluetooth / WiFi incompatibilities
That's nice, but are the interference issues between WiFi and Bluetooth fixed yet?
It would be nice to have the laptop connect to the stereo via Bluetooth while I'm lounging in the living room without cutting out while I'm watching YouTube.
(more info here: Wi-Fi and Bluetooth Coexistence)
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SAR TestingFCC requires Specific Absorption Rate (SAR) Testing.
This site has a list of SAR ratings. For a phone to pass FCC certification, the phone's maximum SAR level must be less than 1.6W/kg (watts per kilogram). The SAR levels shown in the linked chart represent the maximum SAR level with the phone next to the ear.
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Re:Hmm.. check your math
Friis formula is actually Pr=(Pt*Gt*Gr*lambda^2)/(4*pi*r)^2.
Please reference http://www.ce-mag.com/archive/02/Spring/fogelle2.h tml to verfiy.
Obviously if he had a very directonal receiving antenna then this is possible. -
Re:BPL not shielded
more info on standards for RF emmissions that US and Europe are developing here
Near the end:
Although knowledge of RF exposure effects on humans has been around for a number of years, detailed test methodologies are in their infancy. It is highly probable that test procedures will undergo a number of revisions before they become stable. -
Public Safety Radio Pool
If the jammer is manufactured to respect the bands reserved for public safety personnel, then what's the problem?
These bands are not within or close to those used for private, civilian purposes, and have been designated in order that police, fire, medical, and road crews can receive their communications when other infrastructures are down. There's a (rather incomplete) FCC site dedicated to explaining how this system works.
Bringing up the doctor scenario seems quite popular in this discussion, but a jammer that is blocking your cell phone is not going to be blocking a doctor's pager (or police radio, towtruck cb, fireman's pager, etc).
You'll just have to get used to the idea that sometimes Johnny might just have to go without his crack until you leave the theatre.
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Faraday Cage
Like the other low ranked posters said, you don't know quite what you're talking about. This is something you can try for yourself very easily.
Pop the bottom off your case so the the bus is exposed. Now get anything with an antenna and stick the antenna near the backplane (it doesn't have to be that close.) Try different stuff on your computer, and you can hear (or see it) being picked up by your reciever. It isn't just about high speeds -- we used to have fun with this in the 70's.
All those traces on the mother board (and on all the boards) are antennas, and the current sloshes all over them -- it isn't very DC.
The name for the thing you need is a Faraday Cage. A Faraday Cage can be made out of wire net where the spacing between the net fibers is determined by the frequency of the radiation -- the higher the frequency of the radiation the closer together the net has to be.
Here's a link: