If you spoke loud enough, you could be heard 50 miles away. Of course, you'd need some serious speakers to help you speak that loudly... and noise pollution laws would make doing so illegal.
If you broadcast at a low power level, it would be very hard to detect from 50 miles away, and your battery life would be prolonged. The equivalent of noise pollution laws might be able to prevent excessive wattage.
Admittedly it takes less energy to broadcast radio waves discernable from 50 miles than it does to do the same with sound waves, so obnoxious behavior would take less effort...
I'm more of a CS than an EE, but having dealt with the hardware side a little bit, it sounds pretty easy:
You can just steal or buy some testing / teaching equipment from the local EE department... I think things that can hook up to a PC and drive simple signals are common and cheap and allow software to interface with them trivially. My local EE department has hundreds lieing around, though I've never used one, and don't know what they're called.
Or, if you want to build everything yourself, that shouldn't be too hard either. Get a cheap programmable chip (unless you know more than I do about a serial port... it might be possible to do with a simple non-programmable chip that just latches values from the pins at the right time). I used a PIC16F876 at one point... it's basically a miniature computer on a chip, with IO designed for interfacing with things in a programable manner... it worked well, and is cheap ~ $4 or $5 (and you can get them for free if you ask... they give away lots of samples to students). I think it had some built-in module for interfacing with a serial port, but if not that should still be possibly manually, with some assembly coding. The chip didn't have any digital-to-analog converters on it that I can recall, but with LEDs I think switching them on and off really fast for varying periods of time is better than driving them with an variable signal anyway. It also was not capable of driving as much current as I suspect you want, so you'll need external amplifiers, but a handful of discrete transistors works fine for that purpose (and is dirt cheap). The only thing I can think of that you might actually have to pay for is the power supply for the whole thing. And maybe a board to soder on.
Hm... come to think of it, I don't know how to write out to the serial port on any OS more modern than DOS. But you can probably figure that out with a tiny bit of googling.
Because the world is running out of natural gas faster than its running out of oil or any other non-renewable resource. In 5 to 10 years there won't be any left.
My understanding is that it's pulled away from the earth by centrifical force and held down by an anchor. If it fell it should have a tendancy to fall away from the earth. Of course, if it snapped in the middle, the lower piece would fall towards us instead...
Also, it sounds like the book was suggesting a very flat structure... if that's the case for the overall cable, or if the cable readily seperates into extremely flat or thin pieces, it should have a very high surface area to mass ratio, high enough to have a very low terminal velocity.
Okay, maybe I have no clue what I'm talking about. But there may be engineering solutions to that issue.
The high end Hammer chips will have either a 128-bit DDR333 memory bus or 2 64-bit DDR333 memory busses. Either way, that's 5.4 GB/s of memory bandwidth (per CPU), compared to the 2.4 GB/s that you get with a normal 64-bit DDR266 memory bus. The low end Hammer chips will admittedly have merely 2.7 GB/s memory bandwidth (per CPU), but most desktop applications aren't limitted by memory bandwidth. What are you complaining about?
I'm not too familiar with the freshly GPLed SC2 code, but I am VERY familiar with the clone Star Control: Timewarp, and I think that with a bit of effort I could get that working on a GBA. Of course, CPU and storage space would limit what can be done somewhat, and getting the networking to work with an IR port would be painful...
Star Control: Timewarp http://www.classicgaming.com/starcontrol /timewarp/
You can zoom in / out using the - and = keys. If you don't like doing that then you can set the camera mode to act like SC2 (Press F2, select "Game & Rendering", click on "Enemy", click on "Okay").
Dunno what you mean by "flaky" really. You can try making sure all the little check-boxes in the "Game & Rending" menu are checked, they up the graphical quality in some ways (and lower the framerate...).
Intel's processors are not crippled by small L1 cache. Yes, P3 and P4 the L1 caches are WAY smaller than the Athlon L1 cache, but Intel doesn't NEED a large L1 cache, because their L2 cache is extremely fast. Intel tends to have small extremely fast L1 caches, and make up for the higher miss rate with fast L2 caches as well. For instance, the P3 L1 cache has a miss rate roughly twice as high as the Athlons L1 cache, but the P3's L1 miss penalty is roughly 8 cycles (assuming an L2 hit...), less than half the Athlons L1 miss penalty of 20+ cycles on an L2 hit. Also, the P4s L1 cache, which is even smaller than the P3s, allows them to decrease the L1 hit latency AND run at a substancially higher clock speed than AMDs larger cache.
For a graphical depiction of the difference between Intel and AMD cache performances, try this link: http://www.tech-report.com/reviews/2002q1/n orthwoo d-vs-2000/index.x?pg=3 It was the first think that came up in a google search for linpack and "cache size".
Suns MAJC (Multiprocessor Architecture for Java Computing or something like that) tried to automatically transparently split threads into multiple threads using some kind of weird speculative logic. I don't think it worked too well...
Inicidentally, that chip was also supposed to do SMT and single-chip-SMP and SIMD. Dunno how well it faired, I kinda forgot about the chip after its second schedule slip, and I haven't seen it mentioned much since then... it should have been out for at least a year now.
Cracking any specific key-length is P, but cracking RSA in general remains NP, since that method requires checking a number of potential primes proportional to 2^(N/2) or so where N is the key size.
What category? Unfortunately, there's no mathematics Nobel Prize. I realize that they consider applications, but I don't see many in physics, chemistry, medicine, economics, peace, or literature.
I can't get any useful profiling information out of Microsoft Visual C++. When I compile in profiling mode, my program runs at less than 1% of normal speed, producing completely useless data. Am I doing something wrong? Should I be using 3rd party tools?
I don't know. But I do recall from reading the VESA 2.0 standard a while ago, that VESA 2.0 compliance does not require VGA compatibility. That would be a possible route to go.
I'm hoping to recieve the new game Morrowind (sequel to Daggerfall, made by Bethesda) today or tomorrow. It uses pixel-shaders for rending water. If you run in on a GF2, the water looks much worse than if you run it on a GF3.
Slashdot Mirror
I think it's a bit hard to do that in London that it is in the US.
If you spoke loud enough, you could be heard 50 miles away. Of course, you'd need some serious speakers to help you speak that loudly... and noise pollution laws would make doing so illegal.
If you broadcast at a low power level, it would be very hard to detect from 50 miles away, and your battery life would be prolonged. The equivalent of noise pollution laws might be able to prevent excessive wattage.
Admittedly it takes less energy to broadcast radio waves discernable from 50 miles than it does to do the same with sound waves, so obnoxious behavior would take less effort...
Bandwidth is a function of signal-to-noise ratio, which is proportional to power.
I'm more of a CS than an EE, but having dealt with the hardware side a little bit, it sounds pretty easy:
You can just steal or buy some testing / teaching equipment from the local EE department... I think things that can hook up to a PC and drive simple signals are common and cheap and allow software to interface with them trivially. My local EE department has hundreds lieing around, though I've never used one, and don't know what they're called.
Or, if you want to build everything yourself, that shouldn't be too hard either. Get a cheap programmable chip (unless you know more than I do about a serial port... it might be possible to do with a simple non-programmable chip that just latches values from the pins at the right time). I used a PIC16F876 at one point... it's basically a miniature computer on a chip, with IO designed for interfacing with things in a programable manner... it worked well, and is cheap ~ $4 or $5 (and you can get them for free if you ask... they give away lots of samples to students). I think it had some built-in module for interfacing with a serial port, but if not that should still be possibly manually, with some assembly coding. The chip didn't have any digital-to-analog converters on it that I can recall, but with LEDs I think switching them on and off really fast for varying periods of time is better than driving them with an variable signal anyway. It also was not capable of driving as much current as I suspect you want, so you'll need external amplifiers, but a handful of discrete transistors works fine for that purpose (and is dirt cheap). The only thing I can think of that you might actually have to pay for is the power supply for the whole thing. And maybe a board to soder on.
Hm... come to think of it, I don't know how to write out to the serial port on any OS more modern than DOS. But you can probably figure that out with a tiny bit of googling.
duh.
Because the world is running out of natural gas faster than its running out of oil or any other non-renewable resource. In 5 to 10 years there won't be any left.
My understanding is that it's pulled away from the earth by centrifical force and held down by an anchor. If it fell it should have a tendancy to fall away from the earth. Of course, if it snapped in the middle, the lower piece would fall towards us instead...
Also, it sounds like the book was suggesting a very flat structure... if that's the case for the overall cable, or if the cable readily seperates into extremely flat or thin pieces, it should have a very high surface area to mass ratio, high enough to have a very low terminal velocity.
Okay, maybe I have no clue what I'm talking about. But there may be engineering solutions to that issue.
The high end Hammer chips will have either a 128-bit DDR333 memory bus or 2 64-bit DDR333 memory busses. Either way, that's 5.4 GB/s of memory bandwidth (per CPU), compared to the 2.4 GB/s that you get with a normal 64-bit DDR266 memory bus. The low end Hammer chips will admittedly have merely 2.7 GB/s memory bandwidth (per CPU), but most desktop applications aren't limitted by memory bandwidth. What are you complaining about?
working on it
Really? How much?
l /timewarp/
I'm not too familiar with the freshly GPLed SC2 code, but I am VERY familiar with the clone Star Control: Timewarp, and I think that with a bit of effort I could get that working on a GBA. Of course, CPU and storage space would limit what can be done somewhat, and getting the networking to work with an IR port would be painful...
Star Control: Timewarp
http://www.classicgaming.com/starcontro
It's pretty playable for me. But I'm baised.
You can zoom in / out using the - and = keys. If you don't like doing that then you can set the camera mode to act like SC2 (Press F2, select "Game & Rendering", click on "Enemy", click on "Okay").
Dunno what you mean by "flaky" really. You can try making sure all the little check-boxes in the "Game & Rending" menu are checked, they up the graphical quality in some ways (and lower the framerate...).
Intel's processors are not crippled by small L1 cache. Yes, P3 and P4 the L1 caches are WAY smaller than the Athlon L1 cache, but Intel doesn't NEED a large L1 cache, because their L2 cache is extremely fast. Intel tends to have small extremely fast L1 caches, and make up for the higher miss rate with fast L2 caches as well. For instance, the P3 L1 cache has a miss rate roughly twice as high as the Athlons L1 cache, but the P3's L1 miss penalty is roughly 8 cycles (assuming an L2 hit...), less than half the Athlons L1 miss penalty of 20+ cycles on an L2 hit. Also, the P4s L1 cache, which is even smaller than the P3s, allows them to decrease the L1 hit latency AND run at a substancially higher clock speed than AMDs larger cache.
n orthwoo d-vs-2000/index.x?pg=3
For a graphical depiction of the difference between Intel and AMD cache performances, try this link:
http://www.tech-report.com/reviews/2002q1/
It was the first think that came up in a google search for linpack and "cache size".
Suns MAJC (Multiprocessor Architecture for Java Computing or something like that) tried to automatically transparently split threads into multiple threads using some kind of weird speculative logic. I don't think it worked too well...
Inicidentally, that chip was also supposed to do SMT and single-chip-SMP and SIMD. Dunno how well it faired, I kinda forgot about the chip after its second schedule slip, and I haven't seen it mentioned much since then... it should have been out for at least a year now.
Not to mention Aces Hardware
But I set it to plain text! Shouldn't slashdot automatically replace my (less-than) symbol with < or whatever?
Since slashdot doesn't seem to be doing that I feel like the mode shouldn't be called "Plain Old Text".
Ah well. I'm just bitter because I screwed up twice in a row.
Cracking any specific key-length is P, but cracking RSA in general remains NP, since that method requires checking a number of potential primes proportional to 2^(N/2) or so where N is the key size.
What category? Unfortunately, there's no mathematics Nobel Prize. I realize that they consider applications, but I don't see many in physics, chemistry, medicine, economics, peace, or literature.
The Nobel Prize for literature of course.
hm... I'm not sure why it removes comparison symbols when set to plain text... oh well, I wrote out "is less than" this time
They're saying the the time T necessary to determine whether or not an N digit number is prime satisfies this equation:
T is less than N ^ k + a
for some values (can be any finite value) of k and a.
Basically, it's a statement about how well an algorithm scales to REALLY large numbers.
They're saying the the time T necessary to determine whether or not an N digit number is prime satisfies this equation:
T N ^ k + a
for some values (can be any finite value) of k and a.
Basically, it's a statement about how well an algorithm scales to REALLY large numbers.
They're saying the the time T necessary to determine whether or not an N digit number is prime satisfies this equation:
T a)
for some value (can be any finite value) of k and a.
it's the only correct reply so far
Who says technology can't get into chicks?
I can't get any useful profiling information out of Microsoft Visual C++. When I compile in profiling mode, my program runs at less than 1% of normal speed, producing completely useless data. Am I doing something wrong? Should I be using 3rd party tools?
I don't know. But I do recall from reading the VESA 2.0 standard a while ago, that VESA 2.0 compliance does not require VGA compatibility. That would be a possible route to go.
I'm hoping to recieve the new game Morrowind (sequel to Daggerfall, made by Bethesda) today or tomorrow. It uses pixel-shaders for rending water. If you run in on a GF2, the water looks much worse than if you run it on a GF3.