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Speed Cameras In Chicago Earn $50M Less Than Expected

tibit Re:Easy to solve - calibrate them to overestimate (364 comments)

It doesn't matter what the lawmakers' intentions were, the truth is that such laws will end with you killed or your car damaged. First hand experience.

9 hours ago
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Samsung Acknowledges and Fixes Bug On 840 EVO SSDs

tibit Re:DOS version? (81 comments)

A modern Intel Mac will boot into FreeDOS, no problem. It's more like a PC without the BIOS Setup, and supports booting straight into OS X :)

11 hours ago
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Speed Cameras In Chicago Earn $50M Less Than Expected

tibit Re:Easy to solve - calibrate them to overestimate (364 comments)

If there are cars ahead of you blocking the intersection, how would you ever clear it in any time? Now you might argue that you shouldn't enter the intersection if you can't clear it. Great, so you'll end up rear-ended, or killed by the irate armed idiot who decides that you've sufficiently annoyed him. The law has to reflect the reality, not someone's lofty but patently useless desires.

yesterday
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Speed Cameras In Chicago Earn $50M Less Than Expected

tibit Re:Easy to solve - calibrate them to overestimate (364 comments)

"If the light goes red before you clear the intersection you ran it." That's false in quite a few U.S. states. In Ohio, for example, if you're in the intersection when the light turns red, you're merely required to clear the intersection ASAP. That's all, and it's perfectly legal to do so.

yesterday
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Speed Cameras In Chicago Earn $50M Less Than Expected

tibit Re:Easy to solve - calibrate them to overestimate (364 comments)

There's a 50mph road not far from where I'm at, with several intersections with traffic lights on it. The yellow light lasts more than 5 seconds.

yesterday
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Speed Cameras In Chicago Earn $50M Less Than Expected

tibit Re:Easy to solve - calibrate them to overestimate (364 comments)

Cars have airbags so that the people who refuse to buckle their safety belts wont die.

That's just so wrong. Nope, the airbags are the supplemental restraints. They work together with seat belts. Airbag deployment in a frontal collision actually makes you more likely to get injured if you wear no seatbelts, than if you had none - at least for the driver. I've had a T-bone with side airbag deployment, and I can assure you that in this particular case, the seatbelts alone would have done nothing. Again: the restraint system in a car is designed as a system. It's not designed to save you from anyone's folly, it's designed to save you from effects of sudden deceleration. The causes of such sudden deceleration can be and often are beyond human control.

yesterday
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Safercar.gov Overwhelmed By Recall For Deadly Airbags

tibit Re:Well (118 comments)

For what amounts to read-only data, it's a trivial problem with multiple, trivial solutions.

yesterday
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Safercar.gov Overwhelmed By Recall For Deadly Airbags

tibit Re:Be competent? (118 comments)

This is a site serving what amounts to static content with simple lookup. There's zero reason to even use a database outside of startup. On startup simply put it into a native data structure in your programming environment of choice, and be done. MongoDB with replica sets, my ass, that's just crazy. The whole lookup application could be a couple of files on a CDN, a single executable and a single bootstrap data file. And syslog somewhere to listen to the traffic updates. It could run on a VM image with a dozen files on it - literally. Heck, you might not even need any dedicated application servers. Just slice-and-dice the data into multiple, reasonably-sized json files, sliced by VIN ranges, as have the webapp do the lookup entirely using the static content. Then all you do to deploy is upload a bunch of files to a CDN.

yesterday
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Safercar.gov Overwhelmed By Recall For Deadly Airbags

tibit Re:yes, what ever can they do? (118 comments)

The "enterprisey" scalability is probably an entirely overblown and over-the-top approach for such a simple web app. All of the executable and the data needed to serve this app fits comfortably in memory, all at once. You don't need anything fancy. The "effort" needed for lookups and generation of the replies is really tiny, as long as you use a solution that is compiled (or JITed). I'm pretty sure any modern multicore desktop machine would easily handle all of the load and completely saturate a couple gigabit pipes with html in response to the requests. Images and static content belong on a CDN (duh).

The entire dynamic content of the site could be served by a simple C++ executable that doesn't even need to use a database outside of startup. Populate a couple static data structures from sqlite, use libmongoose, microhttpd or a similar httpd library, and you're done. Fast n' easy, the entire deployment could consist of two files: a staticly linked server executable + bootstrap data file. The whole code, with syslog output, could probably fit a couple thousand lines or two, with comments and license headers :)

yesterday
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Manga Images Depicting Children Lead to Conviction in UK

tibit Re:Distasteful stuff, but should not be illegal (452 comments)

Or, perhaps, they are absurdly bad at catching the real ones, so they must turn the imaginary ones into real ones since they are much easier to catch.

yesterday
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Manga Images Depicting Children Lead to Conviction in UK

tibit Re:Moral Imperialism (452 comments)

"to arouse lust towards children" One could equally say that this satisfies said lust without, you know, involving any real children...

yesterday
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iFixit Tears Apart Apple's Shiny New Retina iMac

tibit Re:hum (106 comments)

I'm probably feeding the troll, but who the fuck cares if the middle is not thin? Heck, I'd say who the fuck cares if the sides aren't thin - I have no problem with the look of the inch-thick '07 aluminum iMac. It'd be sheer insanity to try and make the whole thing as thin as a laptop, with the power supply inside of it. You can save quite a bit of money by not making it super-thin where the guts are.

2 days ago
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iFixit Tears Apart Apple's Shiny New Retina iMac

tibit Re:Mac Mini (106 comments)

These days the "hackery" is equivalent to booting to a working partition (can be on a USB stick) and running Multibeast. It's about as fire-and-forget as it gets.

2 days ago
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iFixit Tears Apart Apple's Shiny New Retina iMac

tibit Re:Mac Mini (106 comments)

There are two ways to a hackintosh: using random hardware, and using hardware that's purposefully selected to use the same components that Apple uses in their hardware. The "I''ll just try running OS X on whatever I have" route is perilous and ill-advices. Buying stuff from tonymacx86's buyer guide is a much saner choice, and it worked great for myself.

2 days ago
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iFixit Tears Apart Apple's Shiny New Retina iMac

tibit Re:Mac Mini (106 comments)

I've been using one for almost a year now, and there's no looking back. It was only tricky to set up because initial releases of Mavericks were trickier than the current release. I'd say it was a day well spent to set it all up. These days, using it is no different than using any Apple hardware would be, except that after OS version upgrades one has to reboot to the recovery partition and re-run Multibeast.

2 days ago
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iFixit Tears Apart Apple's Shiny New Retina iMac

tibit Re:how do SSD's compare to HD's? (106 comments)

Modern HDDs media have coercivity so high that the Earth's magnetic field, and the fields from nearby "electronics", are immaterial. The best thing you can do to a HD is leave it alone, not spinning, in a non-condesing atmosphere. As long as the spindle doesn't seize up due to lubricant migration, it might well last for centuries.

2 days ago
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Apple Announces iPad Air 2, iPad mini 3, OS X Yosemite and More

tibit Re:Thunderbolt (353 comments)

Graphics cards really need bandwidth only for texture uploads, and if you're shuttling images between the CPU and the GPU. For many high-performance games, the bandwidth requirement for the CPU-GPU links is rather models.

3 days ago
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Apple Announces iPad Air 2, iPad mini 3, OS X Yosemite and More

tibit Re:Thunderbolt (353 comments)

Thankfully, it acts as a PCIe bridge, too :)

3 days ago

Submissions

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MRI Magnets Cause Nystagmus

tibit tibit writes  |  about 3 years ago

tibit writes "In an interesting twist on "it's so old it's new again", Johns Hopkins researchers led by Dale Roberts found what must have been causing much confusion for doctors the world over: strong external magnetic field can stimulate the semicircular canals, causing vertigo and nystagmus (pendular eye motion). It's a textbook case of Lorentz force in action: our angular rate gyros, the semicircular canals in the middle ear, filled with endolymph, have a ionic current flowing across. In magnetic field, the current produces a force that pushes the lymph along the channel, causing stimulation of the cupula — a pressure sensor at the end of the channel. This is interpreted by the brain as rotation of head in space, and causes a nystagmus that's supposed to stabilize the image on the retina. Of course the subject is laying down and not spinning in space, and the mismatch between inertial measurements coming from the ear and real situation causes vertigo."
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