Stwerp

7 ms·

1.
by Stwerp 12y ago
I understood that it was common to post the paper to arxiv when it was in the process of being peer reviewed by a journal. The problem is the extended lag time between submission and final publication with most journals which pre-print arch
2.
by Stwerp 12y ago
Cool! I'm glad to see RFID and localization being merged together like this. I think this really shows that RFID is a much more suitable technology for this type of application than a computation-heavy CV algorithm.
3.
by Stwerp 12y ago
There was an article the other day posted on this. It operates at 24 and 60 ghz whereas most RFID is in the UHF (900 MHz band). This radio harvests energy to run an oscillator and actively transmits data whereas RFID only reflects back powe
4.
by Stwerp 12y ago
45 dBm is crazy! Do you know the FCC limitations for that frequency? For the ISM bands its +36 dBm EIRP maximum. I'm not familiar with the rules for the higher GHz frequencies.
5.
by Stwerp 12y ago
Maybe you can describe this a bit more. The Great Seal Bug was used for wireless audio recording in the 40's, but this operated by using a microphone/cavity to modulate the load of an antenna; thereby embedding audio in the reflec
6.
by Stwerp 12y ago
Its far-field, so it couples completely differently than NFC tags. Also, NFC communicates by reflecting signals, this device communications by active transmission (according to the article, I haven't read their paper yet). What's
7.
by Stwerp 12y ago
Its a like to a blog on compressive sensing pointing out that sensing (or rather sampling) is mathematically equivalent to using the identity matrix. It goes on as an introduction to compressive sensing.
8.
by Stwerp 12y ago
The UW research is actually using a device from enocean, it seems.
9.
by Stwerp 12y ago
I do see your point but still, a newborn cannot support their head by themselves. Having the muscle ability to be able to hold ones head up is a fairly good prerequisite for being able to walk.
10.
by Stwerp 12y ago
Not for any practical measurements. This would work in say an anechoic environment – save for the wall under test – but you'd end up sampling multipath constructive/destrictuve interference instead of the wall reflections.
11.
by Stwerp 12y ago
>I'm hoping for precise indoor navigation, Google and Apple are currently working on that. All you'd have to do is walk around with your phone, measuring signal strength and then visualize that. I'd wager there are _a lot_
12.
by Stwerp 12y ago
Maybe I'm reading the article wrong, but it seems they are only describing a way to record EMG signals --- and not a way to `control' anything. I've previously worked in neural/EMG recording of flying insects and a major
13.
by Stwerp 12y ago
The article addresses that and intentionally chooses non-human subjects such as walls of graffiti. These still show his `emergent orange' effect. At first I assumed it was his averaging technique, but I'm more apt to believe it ha
14.
by Stwerp 12y ago
While I agree with you, its worth noting that newborns do exhibit a walking reflex (that usually disappears after a few weeks). I would not completely rule out the possibility of a newborn walking with an exoskeleton -- the problem seems to
15.
by Stwerp 12y ago
What then is the research barrier they need to cross? I'm genuinely curious. This seems more "researchy" than a lot of other items I've read (such as optimizing a planar antenna geometry with included matching network et
16.
by Stwerp 12y ago
To be fair, any animals that use body language (i.e. dogs wagging tails) or sight are communicating electromagnetically (reflected light) in the same we humans communicate electromagnetically. We're not generating our own EM signals, b
17.
by Stwerp 12y ago
>The most irritating thing was the keyboard which could not be mapped in the "standard" PC way (i.e. Ctrl Super Alt in the bottom left). That's funny. After using a mac for several years, that's my biggest gripe about
18.
by Stwerp 12y ago
This is actually one of the biggest reasons I am still in Mac OS. Are there any *nix builds or distributions that have this separation out of the box? I.e.: C-b, C-a, etc (emacs commands) including C-v for scroll (and not system paste) and
19.
by Stwerp 13y ago
Thank you for posting the PDF link. For the life of me, I have NO IDEA why sites still try to push hacked together PDF viewers on us when there are tools already on my system. I really thought this site was just broken.
20.
by Stwerp 13y ago
From what I've seen of their demos (going off memory), they focus on power transfer to a single device. Their efficiency drops to near 0% when multiple devices are being powered. I have a hard time getting excited about these guys&#x27
21.
by Stwerp 13y ago
Clicking "how does it work" and scrolling down has a link to a paper published in ubicomp 2010 detailing the CMOS chip and modulation. They seem pretty open about the technology to me.
22.
by Stwerp 13y ago
Is soul the imprecision of notes not being perfectly uniform in duration and velocity? That's what your above comment seems to imply. For instance: Consider a recording from a piano played by a human and a computer-generated MIDI file
23.
by Stwerp 13y ago
I agree with your sentiment, but sadly science (or rather, the doing of science) is about prestige. Put yourself in the shoes of a funding agency. If you have two grant proposals, one from somebody at an institution in the middle of the cou
24.
by Stwerp 13y ago
I can't find details of his hack, but I am curious if his detector detects actual read events (when his device responds with its ID) or if it is just an RF power detector. Is there a link to a technical description?
25.
by Stwerp 13y ago
However, in the case of Borderlands at least, the app store version would limit you from playing multiplayer with anyone with the Steam version.
26.
by Stwerp 13y ago
From my reading of the rules, you are limited to broadcasting +36 dBm EIRP (30 dBm [1W] into a 6 dBi antenna -> 4W EIRP). This can be a single frequency. In the 900 MHz band, your bandwidth is limited to 902-928 MHz (US limitations, diff
27.
by Stwerp 13y ago
For anyone else interested, the full paper is available here: http://conferences.sigcomm.org/sigcomm/2013/papers/sigcomm/p...
28.
by Stwerp 13y ago
Backscatter refers to reflecting RF power. Ambient backscatter is modulating the reflections of the ambient RF signals as opposed to beaming a signal in from a source as RFID does. The device you built uses the incoming signal to power the
29.
by Stwerp 13y ago
It seems like this would work over extremely short distances since the carrier signals at tags A and B are basically the same. If ambient backscatter is going to be implemented over a larger area, the multipath or modulation of the carrier
30.
by Stwerp 13y ago
> The devices could pickup the signal and estimate the location very precisely, down to inches - so it is definitely a technology that could be used to indoor-navigation for robots, machines in the factory or doctors in a hospital. There

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