Please create an account to participate in the Slashdot moderation system

 



Forgot your password?
typodupeerror
×

Comment Preserving privacy (Score 1) 323

The oldest method: Don't be interesting.

While a bit tongue in cheek, it's a fairly good way. Even if your data is in whatever databases, if there's no use of it, then it might as well not exist.

Unfortunately, that works both ways in some cases. I keep hearing about Charlie Sheen. I decided to look a little last night and no one has made a coherent summary of it. Better yet, could everyone stop talking about him?

Granted, that won't prevent automated things like targeted advertising. However, if you haven't yet developed a mental filter for advertising, I'd get started, it helps on so many things. In fact, if not for being a method for infection/malware, I probably wouldn't use adblock. (That I got tired of the Flash/PDF ads that tried to infect my machine was the ultimate catalyst for that. Too bad for sites that are ad based, but there are enough sleazy ads that they lose out.)

Comment This isn't the first... (Score 2) 72

There was one done quite a bit ago that used sugar as the print material. Wasn't very high resolution, but it worked, and could be eaten. Also, I've heard of Rep-raps using chocolate (and other substances) in the past.

This also doesn't appear very high resolution, so I'm failing to see what about this is first or even particularly novel about it. The only first I see is the specific things they used.

Ah, indeed, I have found a link: http://www.evilmadscientist.com/article.php/candyfab

Comment Re:Mistake in Summary (Score 1) 318

If that isn't counting reverse paths a->b->c = c->b->a then you can halve that, as they are the same.

There are plenty of optimizations on TSP, the problem is that the worst case is what gets nasty. There are also things which will give an estimate (1.5x shortest, if I recall correctly) if some conditions are met.

Comment Re:Mostly unnecessary (Score 1) 202

802.11a fixed devices/networks are fairly rare (802.11a clients are fairly common, as part of abgn cards, but I've seen a number of seemingly bgn only cards. (They might be capable of a and not well documented, or they might be limited to the 2.4GHz band, either way, they strike me as dodgy so I don't have first hand experience with them.)

If you want an adhoc for transferring, I would usually suggest A if both are capable of it.

Comment Re:Let me just say (Score 1) 169

Actually, I could see a use for it, if it can be deposited in parts of a silicon chip: Cutting power to parts of the chip.

Though there are a lot of problems with the few solutions I've come up with in about 2 minutes of reading this. Mostly involving using different materials on the wafer, but if it is that much more efficient, I could see the relatively expensive process of cutting a few parts to be replaced with this out with lasers eventually panning out.

Then again, most of the actual silicon I've looked at personally with any degree of knowledge was 1980s/early 1990s level stuff. Now they are more or less black boxes described by whitepapers.

Comment Re:Accidental? (Score 1) 546

The peculiar part of this particular thing was that it had it's landing lights on, and appeared to be low. We were about 8-10 miles from the nearest airport, and the aircraft didn't seem to be going into any of the landing patterns I've seen before. (Disclaimer: I'm not a pilot, I just hang out with some.) The plane looked a bit like a 737 or A320, but twin engine airliners with similar ratios are hard to tell apart. Specifically, for a long time it had motion, but not much compared to your average airliner, it appeared bright, and low on the horizon. Oh and we weren't the only ones observing the meteor shower (There was a whole state park filled with people doing that). While I'd make sure that we didn't have any lasers used in an unsafe manner, I don't count on the general public to do that. While they wouldn't have blinded the pilots (permanently), they very well could have caused problems with night vision.

(Also, my calculations of safety were off, but only by a density of 2, so call even the spyder is safe by 3 miles, not 2. That's at least for the blink reflex to protect your eyes. Also, the plane would have been a bit further out. Time mistakes likely be less common if we used decimal time.)

Either way, non-blinding, but potentially distracting for a pilot, even if it were only for a short bit, with a more powerful laser (3B or 4, in either system) which are increasingly coming in laser pointer form factor. Mind you I'd like to have some of them, but I have kids around sometimes. Kids do stupid things with regard to lasers. Having seen how even a relatively unfocused (Class 4 equivalent) beams can cut through things, I'm thinking that class 4 should not be in 'laser pointer' style enclosures. Available to the general public, yes. However, not in a form which most people associate with harmless Class 3A (or 3R).

Comment Re:Accidental? (Score 1) 546

Actually I think it is possible.

I was out stargazing/meteor watching with friends last year near a local observatory, and there was a really bright light to the southwest that we couldn't think of what it was, some were thinking had to be (as it was bright, moving a *very* small amount, and looked almost exactly like Venus does), but some didn't think could be Venus (as it should have set). Going on however long, probably close to 20 minutes, it starts moving more, and eventually we are able to see what it is: an aircraft with it's landing lights on, eventually passing nearly overhead. For about 10 minutes, we didn't know what it was. (And then we started suspecting an aircraft as the apparent brightness and movements were greater.) Oh, and If I recall correctly, we had 2 people with AE degrees with us, and several people who work with aircraft for their jobs (actually probably half the group). If we didn't figure it out that quickly, I highly doubt anyone with less experience of aircraft would have, before they pointed it out.

If any of us had been using green pointers, I highly suspect someone would have pointed it out that way, as opposed to pointing it out verbally and with fingers. The only remaining questions were how far away it was, if we'd have had the power to be visible at the distance (at 5mW, unless the beam was really good, I kind of doubt it), and if we'd hit the cabin. Granted, they were not on final or anything (they did seem to be a little lower than expected). That experience has suggested to me that it is fairly likely that at least some of them are likely to be accidents.

I can't find the lower limit of human vision, so I can't tell, but if we assume say 400mph, It would have been about 40 miles away before we decided it was an airplane. Which would put even the blue spyder lasers in the harmless (it gets there before 2 miles (with blink reflex)), but visible category. A 5mW laser might not even be visible depending on divergence. (5mW is the limit of what get called laser _pointers_ are supposed to be restricted to. Finished products of more than 5mW aren't supposed to be called laser pointers, but everyone seems to ignore that.)

Slashdot Top Deals

If all else fails, lower your standards.

Working...