An attacker can receive the satellite signal and retransmit it.
In case the attacker only wants to shift the time a bit -which could be important for communication networks- this would not be too hard indeed. If, on the other hand, he wanted to do a spoofing of the position, that would require capturing the satellite signals and delaying them individually. For the civilian code, the separation of the satellite signals can be done easily by digital correlation. However, because the military code is not publicly known, the isolation of the signals can only be done using large dish antennas, each of which has only one satellite in view. One would need at least four of those, and they would need to track the satellite positions. While not impossible, this much less trivial, especially without being spotted, because the receiving antennas would need to be close to the target.
Is is really cool that they not only show their successes and can put things in perspective. It is rocket science, things are complex and do not always work out as planned. Especially the first time. And the second. And...
It is also motivational for others to see that even highly specialized companies need some learning too. And succeed in the end.
Not getting paid, er, when and by who? Look, I have a stack of books around here, all of which I bought used. The authors don't get paid - again - when I pick up one from the stack and read it. Why do you people in the music industry think you are so much more special than other artists?
I know it is not done on this site to stand up for musical artists, but this analogy is plain wrong. The situation you describe is analogous to you buying an LP or CD or whatever physical recording medium from someone else, making it unavailable to the original owner. He cannot read the book any more nor play the CD. No musician objects against that.
The situation at hand here is one where music is streamed or otherwise distributed without a traceability of the persons that are entitled to royalties on the end product. In your analogy, that would be like printing books in the newspaper or other media without the original author getting in on it. I don't think that would happen without any protest.
It depends. I"ve picked up the original Doom series [...] and still have a good time with them. [...] Even jumping across from tower to tower in Doom still gives me a thrill.:)
They did this by combining photos shot simultaneously with the iPhone's two cameras, each with a different field of view, into a sort of depth map, and then applying a blur filter over the parts of the photo it identifies as the background. That is a combination of great engineering and computational magic
It may be a great feat of engineering, but not what (DSLR) photographers are looking for.
Yes, it's true that you can get better photos with a DSLR [...] which takes at least a few hours of training for most people.
So, in short: DSLRs are for people who appreciate the absence of digital shenanigans, who know what they are doing, and are prepared to invest money and time to learn how to use their tools. I fail to see how the iPhone is introducing the end of the DSLR, except for those who did not need a DSLR in the first place.
Coax is a wave guide, so I believe that the ohms quoted are AC impedance, not DC resistance. Impedance is a function of cable geometry (diameters of the inner and outer cables of the wave guide), not simply cable length, so cutting it shouldn't have an effect AFAIK
A improperly matched cable transforms the impedance. The nature of the transformation changes along the cable and has a periodicity of half a wavelength. More specifically, a quarter wavelength cable will match two impedances when its impedance is the geometric mean of the source and load. In this case, if the source impedance is 50 Ohms and the RG59 is 75 Ohm, a quarter wavelength line (possible extended with runs of half-wavelengths) would match 75^2/50=112.5 Ohm. If this is the antenna impedance, he will be fine. Over a narrow band width and with standing waves over the cable, but it will be matched.
That these people group vaping in with smoking shows that they really don't care about health. If these things help with smoking cessation, and they don't carry the passive smoking risks, then why are we being told to go stand with the smokers? I'm actually trying to avoid smoking, yet I'm having to go stand in an area that exposes me to the risks of passive smoking.
Maybe because to OTHERS vaping is almost as annoying as smoking. For years these people have been exposed to the stinking and toxic fumes of smokers. Now that we finally have some legislation to protect the non-smokers, YOU come and complain that "being around smokers" -which you were one of yourself, apparently- "is not good for your health".
You know ahat? This is not only about YOU. Other people, non-smokers are happy they were finally entitled to some fresh air and now you want to ruin that for them as well with your "vaping."
So... what's the next ridiculous craze that I should work to prevent my daughter from getting into? Thanks for letting me breathe a small sigh of relief from having dodged this bullet...
Boys!
You knew. Every father knows. Bring out your shotgun!
A fridge works via a compressor motor that isn't on all the time which actually generates more external heat than it internally cools when used inside a room.
This is a logical result of thermodynamics and holds for any cooling apparatus. Otherwise it would be destroying heat (energy) and could even lower the entropy, violating the first two laws of thermodynamics.
Assuming you have a two hour movie, then each second of the movie must be mapped into about one byte, which can have only 2^8 = 256 possible values to represent any conceivable second of video. It's mathematically impossible.
Apart from the mathematical impossibility, the practical implications are also interesting. This would also imply there are only 256 different fragments which can be played in any second ever. And all movies would consist of only a reshuffeling of these 256 seconds. That means it becomes impossible to do a quiz in which people are shown a 1 second clip of a movie and need to guess what movie it is, because there could be only 256 distinct answers while the number of movies is obviously much higher. Even worse: because all movies would be made up of a succession of one of these 256 1-second clips, any arbitrary clip would probably appear in every movie ever made. Almost all answers to the question would be valid.
Who granted the copyright for data that was payed for by the tax payers?
The researchers paid with you tax money did. Their interests and the nation's interests are not necessarily the same.
They decided to publish in a "reputable" magazine than in some "non-established" open journal (possibly) because it adds to their prestige.
This may change. Maybe in ten years the open journals are more prestigious. Maybe the Government should instate a law prohibiting publication in non-open journals.
Besides: the conflict between personal interest and the judicious spending of tax money is nothing new. What benefit do you have from your president spending his weekends in mar-a-lago?
Well I want access to the research that MY tax payer dollars payed for.
While I understand your indignation, this is not Elsevier's fault.
Their business plan is to offer peer reviewing of articles in exchange for the copyright of said articles.
The researcher your tax money was spent on had he choice not to work with Elsevier.
He/she decided to do so anyway, possibly because of the (alleged) higher prestige of Elsevier's publications, or for another reason.
It is the researcher who gave up the rights to the fruits of your tax money, not Elsevier.
A better counter attack, IMO, would have been to replace the content Burger King was expecting with something else, e.g. an audio clip of Meg Ryan's faux orgasm from "When Harry Met Sally"
Note that that clip ended in a woman saying "I'm having what she is having". Don't think BK would object.
you allow that generating station to use wind, waves, gravitational potential energy, light, nuclear decay,... to power the vehicle, rather than petrol.
This is completely true, hands down! And a Good Thing.
Further, you also simply make the whole system more efficient - petrol motors are horribly inefficient, typically around 30-35%.
Here it goes wrong. How can you compare the "efficiency" of solar and combustion engines? Besides: afaik the efficiency, aka "how much energy potential is there in the source and how much can we extract" of nuclear is far worse than that of a combustion engine, but that doesn't matter because the energy density in the nuclear fuel is infinitely higher. The "efficiency" of solar panels is also much lower than the 50% you quote. So the intrinsic efficiency is largely irrelevant.
To make a fair efficiency based comparison, the power plant should also run on petrol and in that case I doubt the increased efficiency of a plant versus a car compensates for the losses in the electrical conversion.
What you are referring to is demodulation of AM signals in much the same way a crystal receiver operates. That requires a fairly strong signal and a nonlinear device, i.c. a diode formed by two different metals in your brace, a germanium diode (crystal set) or iron/rust junctions in barb wire, which also exhibits this phenomenon.
The article is about a modulation of a pre-existing radio wave, similar to a spy device the Russians used during the Cold war. A difference is that the Russians transmitted a dedicated carrier to be modulated, while this technique piggybacks on existing radio waves.
Slashdot Mirror
The difference is negligible.
Source?
Mehinks that selective breeding goes a lot slower, allowing more time to discover "unwanted" side effects.
An attacker can receive the satellite signal and retransmit it.
In case the attacker only wants to shift the time a bit -which could be important for communication networks- this would not be too hard indeed. If, on the other hand, he wanted to do a spoofing of the position, that would require capturing the satellite signals and delaying them individually. For the civilian code, the separation of the satellite signals can be done easily by digital correlation. However, because the military code is not publicly known, the isolation of the signals can only be done using large dish antennas, each of which has only one satellite in view. One would need at least four of those, and they would need to track the satellite positions. While not impossible, this much less trivial, especially without being spotted, because the receiving antennas would need to be close to the target.
as if 2540C really provides any more meaningful a reference point as 4600F
To someone unfamiliar with the Fahrenheit scale it does.
It is also motivational for others to see that even highly specialized companies need some learning too. And succeed in the end.
Do you think Intel does that because they enjoy making CPUs then sell them cheaply with some cores switched off for ... reasons?
Yes. The reason is they have a market for people willing to pay less for getting less.
Not getting paid, er, when and by who? Look, I have a stack of books around here, all of which I bought used. The authors don't get paid - again - when I pick up one from the stack and read it. Why do you people in the music industry think you are so much more special than other artists?
I know it is not done on this site to stand up for musical artists, but this analogy is plain wrong. The situation you describe is analogous to you buying an LP or CD or whatever physical recording medium from someone else, making it unavailable to the original owner. He cannot read the book any more nor play the CD. No musician objects against that.
The situation at hand here is one where music is streamed or otherwise distributed without a traceability of the persons that are entitled to royalties on the end product. In your analogy, that would be like printing books in the newspaper or other media without the original author getting in on it. I don't think that would happen without any protest.
It depends. I"ve picked up the original Doom series [...] and still have a good time with them. [...] Even jumping across from tower to tower in Doom still gives me a thrill. :)
[John]
Mr Carmack, is that you?
people like this ruin for the rest of us.
Not if he makes his collection public. In fact, that would remove 90% of the need for unlimited storage in the first place. Win-win!
They did this by combining photos shot simultaneously with the iPhone's two cameras, each with a different field of view, into a sort of depth map, and then applying a blur filter over the parts of the photo it identifies as the background. That is a combination of great engineering and computational magic
It may be a great feat of engineering, but not what (DSLR) photographers are looking for.
Yes, it's true that you can get better photos with a DSLR [...] which takes at least a few hours of training for most people.
So, in short: DSLRs are for people who appreciate the absence of digital shenanigans, who know what they are doing, and are prepared to invest money and time to learn how to use their tools. I fail to see how the iPhone is introducing the end of the DSLR, except for those who did not need a DSLR in the first place.
Coax is a wave guide, so I believe that the ohms quoted are AC impedance, not DC resistance. Impedance is a function of cable geometry (diameters of the inner and outer cables of the wave guide), not simply cable length, so cutting it shouldn't have an effect AFAIK
A improperly matched cable transforms the impedance. The nature of the transformation changes along the cable and has a periodicity of half a wavelength. More specifically, a quarter wavelength cable will match two impedances when its impedance is the geometric mean of the source and load. In this case, if the source impedance is 50 Ohms and the RG59 is 75 Ohm, a quarter wavelength line (possible extended with runs of half-wavelengths) would match 75^2/50=112.5 Ohm. If this is the antenna impedance, he will be fine. Over a narrow band width and with standing waves over the cable, but it will be matched.
If you Google it, you will find it was made by Reuters and copied by newspapers, e.g. nypost.
That these people group vaping in with smoking shows that they really don't care about health. If these things help with smoking cessation, and they don't carry the passive smoking risks, then why are we being told to go stand with the smokers? I'm actually trying to avoid smoking, yet I'm having to go stand in an area that exposes me to the risks of passive smoking.
Maybe because to OTHERS vaping is almost as annoying as smoking. For years these people have been exposed to the stinking and toxic fumes of smokers. Now that we finally have some legislation to protect the non-smokers, YOU come and complain that "being around smokers" -which you were one of yourself, apparently- "is not good for your health".
You know ahat? This is not only about YOU. Other people, non-smokers are happy they were finally entitled to some fresh air and now you want to ruin that for them as well with your "vaping."
So ... what's the next ridiculous craze that I should work to prevent my daughter from getting into? Thanks for letting me breathe a small sigh of relief from having dodged this bullet...
Boys!
You knew. Every father knows. Bring out your shotgun!
A fridge works via a compressor motor that isn't on all the time which actually generates more external heat than it internally cools when used inside a room.
This is a logical result of thermodynamics and holds for any cooling apparatus. Otherwise it would be destroying heat (energy) and could even lower the entropy, violating the first two laws of thermodynamics.
Assuming you have a two hour movie, then each second of the movie must be mapped into about one byte, which can have only 2^8 = 256 possible values to represent any conceivable second of video. It's mathematically impossible.
Apart from the mathematical impossibility, the practical implications are also interesting. This would also imply there are only 256 different fragments which can be played in any second ever. And all movies would consist of only a reshuffeling of these 256 seconds. That means it becomes impossible to do a quiz in which people are shown a 1 second clip of a movie and need to guess what movie it is, because there could be only 256 distinct answers while the number of movies is obviously much higher. Even worse: because all movies would be made up of a succession of one of these 256 1-second clips, any arbitrary clip would probably appear in every movie ever made. Almost all answers to the question would be valid.
Who granted the copyright for data that was payed for by the tax payers?
The researchers paid with you tax money did. Their interests and the nation's interests are not necessarily the same. They decided to publish in a "reputable" magazine than in some "non-established" open journal (possibly) because it adds to their prestige. This may change. Maybe in ten years the open journals are more prestigious. Maybe the Government should instate a law prohibiting publication in non-open journals.
Besides: the conflict between personal interest and the judicious spending of tax money is nothing new. What benefit do you have from your president spending his weekends in mar-a-lago?
Well I want access to the research that MY tax payer dollars payed for.
While I understand your indignation, this is not Elsevier's fault. Their business plan is to offer peer reviewing of articles in exchange for the copyright of said articles.
The researcher your tax money was spent on had he choice not to work with Elsevier. He/she decided to do so anyway, possibly because of the (alleged) higher prestige of Elsevier's publications, or for another reason. It is the researcher who gave up the rights to the fruits of your tax money, not Elsevier.
A better counter attack, IMO, would have been to replace the content Burger King was expecting with something else, e.g. an audio clip of Meg Ryan's faux orgasm from "When Harry Met Sally"
Note that that clip ended in a woman saying "I'm having what she is having". Don't think BK would object.
"Now Uber can't use IT's apps."
Better?
dealing with chainsaws that can rip off your arm is much more dangerous than a classroom of kindergarteners.
I take it you have never been in a classroom of kindergarteners, have you?
you allow that generating station to use wind, waves, gravitational potential energy, light, nuclear decay, ... to power the vehicle, rather than petrol.
This is completely true, hands down! And a Good Thing.
Further, you also simply make the whole system more efficient - petrol motors are horribly inefficient, typically around 30-35%.
Here it goes wrong. How can you compare the "efficiency" of solar and combustion engines? Besides: afaik the efficiency, aka "how much energy potential is there in the source and how much can we extract" of nuclear is far worse than that of a combustion engine, but that doesn't matter because the energy density in the nuclear fuel is infinitely higher. The "efficiency" of solar panels is also much lower than the 50% you quote. So the intrinsic efficiency is largely irrelevant. To make a fair efficiency based comparison, the power plant should also run on petrol and in that case I doubt the increased efficiency of a plant versus a car compensates for the losses in the electrical conversion.
reference
What you are referring to is demodulation of AM signals in much the same way a crystal receiver operates. That requires a fairly strong signal and a nonlinear device, i.c. a diode formed by two different metals in your brace, a germanium diode (crystal set) or iron/rust junctions in barb wire, which also exhibits this phenomenon.
The article is about a modulation of a pre-existing radio wave, similar to a spy device the Russians used during the Cold war. A difference is that the Russians transmitted a dedicated carrier to be modulated, while this technique piggybacks on existing radio waves.
That was not without damage, though.
But will they be using email?