The frequencies used by RFID at the most are 5.8GHz. That equates to about.05 meters of wavelength, or about 50 millimeters. A typical RF shield needs to block 1/4 of a wavelength, or.0125 meters, or just about half an inch.
In my book, that means about, oh, two strands per inch.
It's not that epidermis is an insulator, it's that it is a conductor. Sweat, salt, humidity: all of these things contribute to your skin being a faraday cage.
This brings to mind one of the greatest fallacies of the modern age: to wit, staying in your car during a lightning storm keeps you safe because you are 'insulated' by the tires.
BS. The only thing that keeps you safe in your car is the metal skin of that car. An average lightning bolt has enough potential voltage to conduct right through hundreds of feet of 'tire'.
You're absolutely correct, I don't know what I was thinking. 48 volts can be felt for sure, but most of the current still travels across your skin, not through your body.
It's for DC resistance, not AC impedance. ( I used to build energizers for electric fences, and the owner of the company wanted to get UL marked. Unfortunately, the total energy transfer in our design was two orders of magnitude higher than UL would allow for...any less any the fences were ineffective, so we never got UL marked). We used a variety of DC voltage levels, up to about 10k (for Buffalo) with a 17ms pulse. Let me tell you, I got hit more than once..and that stuff *hurt*, but it never killed me.
Again, a lot of the current goes around your body, not through it. Though there is the story about the military instructor who was explaining exactly this concept to his class, and poked the sharp ends of two leads (connected to a 9v battery) into each of his thumbs, and it supposedly killed him. Check snopes, I'm too lazy to verify it.
UL considers the average human (for testing safety purposes) to be about 500 Ohms. Since most PoE is around 12v, you end up with about 24 milliamps across a 500 ohm load.
For that to have a severely negative effect, it would need to cross your heart. Most of the current will likely go around your skin (you are your own faraday cage) so you most likely would never even feel it.
Plus, you would have to actually come in contact with it...which is pretty easy to avoid.
You obviously missed the 'shut itself down' portion. Any condition which can be detected and cause a shutdown was predicted. If it was predicted, and detected, then it should have been logged, thus easily traceable.
Ignoring for the moment the cost and the dubious necessity for such a system, what worries me more is:
'failed to launch due to an unknown anomaly'
What kind of engineering is this? With all of the possible metrology, the system 'shut down' due to an unknown anomaly? If the scientists and engineers can't grok what causes a 'shut down', then they need new jobs...possibly in the NYC sanitation department.
The system 'shut itself down'...ergo, a failure condition (anomaly) must have existed. I fail to understand how the 'system' knew about a problem that was bad enough to shut itself down, yet somehow the folks running said system aren't able to discern exactly what that was? Hell, even Windows has 'event viewer' and kernel dumps.
Why are they the scum of the earth? They are people that see a high-risk, high reward market. Why is it high-risk/high reward? Because it's illegal to sell drugs. They choose to sell drugs because they perceive the reward to be worth the risk.
If you let people make their own decisions about what they can and can't ingest (especially those things that occur in nature, as opposed to some of the current things our wonderful pharma-corps are peddling), and make it *their* responsibility as to the outcome of said behavior, you have immediately introduced incentive for responsible marketing of said substance.
It has been proven ad nauseum that marijuana has far less detrimental (if any) effect on the human system than your average cigarette...but those are legal.
And why are drugs illegal? Hmm?
I suggest you do some googling for the 'marijuana gin', and popular mechanics. You may want to also research the "king's acre" among other things.
I for one bet that our bacteria could kick their bacteria ass!
Of course, I also say 'viruses' instead of 'virii', so I'm probably off base here.
Oh...hey...a real question: When, exactly, are humans sending a craft to Mars that has the capability of returning? We can barely get one to land successfully now.
Individuals CAN build a car...or a motorcycle...or just about anything else...and sell it for a premium to those who appreciate it. Software is a bit different...because it has no 'sex appeal'.
Saying that he is safe because he is a 'lone coder' is analagous to advocating 'security through obscurity'. In short...he isn't safe, and it isn't secure.
While we've all seen 'success' stories through shareware or non-traditional publishing, it doesn't mean that he is immune from prosecution from some 'IP ' lawyer (there are companies now that do this as their sole source of revenue)...he needs to innovate something new, patent it before publishing, then publish. Then his method of remuneration is irrelevant with regards to being sued...it's solely a function of how well he markets, and how necessary/good/needed his software is.
Seriously though, the one good thing I can think of about all this ridiculous IP litigation is that it actually can drive a good 'lone coder' to really innovate as opposed to create the same old mouse trap in a different way.
GigEth of course works great in a LAN situation...it wouldn't be used in any other. It has a distance limitation of 100 meters per segment. This has nothing to do with TCP. My point was, the author was saying that 'today's bandwidth' was too much for TCP...when, in fact, most home connections max out at about 6Mb in one direction, and real world throughput on GigE (using TCP) has been clocked as high as 600Mb, and usually ends up being hardware (PC bus) limited. Hence my 'two orders of magnitude' statement
TCP windowing is not a function of RTT, other than the fact that a timout will cause a retransmit, and resizing. That TCP timeout is configurable. TCP starts small, and works its way up in window size until it either hits the max configured window size, or fails to get an ack. No ACK=downsize and resend.
The 'inherent physics' of light that you refer to are a known quantity. Average RTT from coast to coast in the US is anywhere from 60 to 80 ms, depending on your provider, current congestion, and specific hardware latency at each hop. If your TCP RTT limit is set at or below those levels, I'm amazed it works at all.
It's hooey...
on
Replacing TCP?
·
· Score: 4, Insightful
TCP doesn't use RTT to 'calculate congestion'.
This is a load of fluff, trying to capitalize on the 'p2p craze'. There are plenty of TCP replacements out there, that actually make sense. As far as TCP not being able to utilize 'today's bandwidth', again...hooey. Gigabit ethernet (when backed by adequate hardware, and taking advantage of jumbo frames) moves a HELL (two orders of magnitude) of a lot more data than your typical home broadband connection...using TCP.
Slashdot Mirror
That's the day I was going to retire.
Stupid, stupid asteroid.
While I get the joke, you're wrong.
.05 meters of wavelength, or about 50 millimeters. A typical RF shield needs to block 1/4 of a wavelength, or .0125 meters, or just about half an inch.
The frequencies used by RFID at the most are 5.8GHz. That equates to about
In my book, that means about, oh, two strands per inch.
Wrong.
It's not that epidermis is an insulator, it's that it is a conductor. Sweat, salt, humidity: all of these things contribute to your skin being a faraday cage.
This brings to mind one of the greatest fallacies of the modern age: to wit, staying in your car during a lightning storm keeps you safe because you are 'insulated' by the tires.
BS. The only thing that keeps you safe in your car is the metal skin of that car. An average lightning bolt has enough potential voltage to conduct right through hundreds of feet of 'tire'.
You're absolutely correct, I don't know what I was thinking. 48 volts can be felt for sure, but most of the current still travels across your skin, not through your body.
It's for DC resistance, not AC impedance. ( I used to build energizers for electric fences, and the owner of the company wanted to get UL marked. Unfortunately, the total energy transfer in our design was two orders of magnitude higher than UL would allow for...any less any the fences were ineffective, so we never got UL marked). We used a variety of DC voltage levels, up to about 10k (for Buffalo) with a 17ms pulse. Let me tell you, I got hit more than once..and that stuff *hurt*, but it never killed me.
Again, a lot of the current goes around your body, not through it. Though there is the story about the military instructor who was explaining exactly this concept to his class, and poked the sharp ends of two leads (connected to a 9v battery) into each of his thumbs, and it supposedly killed him. Check snopes, I'm too lazy to verify it.
UL considers the average human (for testing safety purposes) to be about 500 Ohms. Since most PoE is around 12v, you end up with about 24 milliamps across a 500 ohm load.
For that to have a severely negative effect, it would need to cross your heart. Most of the current will likely go around your skin (you are your own faraday cage) so you most likely would never even feel it.
Plus, you would have to actually come in contact with it...which is pretty easy to avoid.
You obviously missed the 'shut itself down' portion. Any condition which can be detected and cause a shutdown was predicted. If it was predicted, and detected, then it should have been logged, thus easily traceable.
Ignoring for the moment the cost and the dubious necessity for such a system, what worries me more is:
'failed to launch due to an unknown anomaly'
What kind of engineering is this? With all of the possible metrology, the system 'shut down' due to an unknown anomaly? If the scientists and engineers can't grok what causes a 'shut down', then they need new jobs...possibly in the NYC sanitation department.
The system 'shut itself down'...ergo, a failure condition (anomaly) must have existed. I fail to understand how the 'system' knew about a problem that was bad enough to shut itself down, yet somehow the folks running said system aren't able to discern exactly what that was? Hell, even Windows has 'event viewer' and kernel dumps.
This cash cow needs to have her neck severed.
Just once I want to be the guy who these fucktards approach to get 'my advertising' into their spyware model.
/., and wait for the inevitable melee.
/.,
Just once. I'll string them along, until I've met all the most important players in their company.
Then...I'll post all of their details on
And, in the spirit of
2.?????
3.Profit!
Of course you would include the drug dealers.
Why are they the scum of the earth? They are people that see a high-risk, high reward market. Why is it high-risk/high reward? Because it's illegal to sell drugs. They choose to sell drugs because they perceive the reward to be worth the risk.
If you let people make their own decisions about what they can and can't ingest (especially those things that occur in nature, as opposed to some of the current things our wonderful pharma-corps are peddling), and make it *their* responsibility as to the outcome of said behavior, you have immediately introduced incentive for responsible marketing of said substance.
It has been proven ad nauseum that marijuana has far less detrimental (if any) effect on the human system than your average cigarette...but those are legal.
And why are drugs illegal? Hmm?
I suggest you do some googling for the 'marijuana gin', and popular mechanics. You may want to also research the "king's acre" among other things.
he probably has his settings to do html formatted, but doesn't know the carat-p or carat-b type stuff.
I for one bet that our bacteria could kick their bacteria ass!
Of course, I also say 'viruses' instead of 'virii', so I'm probably off base here.
Oh...hey...a real question: When, exactly, are humans sending a craft to Mars that has the capability of returning? We can barely get one to land successfully now.
I can think of at least two things that seriously pre-date MS.
Speak and Spell, for one.
Flash cards, for two...which predate by *quite* a significant margin.
It uses 'RFID' for power? Amazing...I suppose next we'll see cop cars that use Driver's Licenses for fuel.
Good points (you and the other two replies).
:(
Again, like I said, IANAL...and I honestly didn't think about it like that.
Sad times. Sad times.
I like the cut of your jib. Except for that 'publicated' word...I'm still not convinced it's a real word.
Anyway...wanna market for my company?
IANAL either, but one thing I remember from civics class is that 'ignorance is no excuse'
I'm not saying it's "right", but I doubt you could justify your point in a court of law by saying "I didn't know!"
It's a pretty flimsy foundation to base any money/hundreds of hours of work on...
This is the first time I've ever asked for this, but somebody needs to mod the parent funny. C'mon...that's classic slashdot mentality!
Individuals CAN build a car...or a motorcycle...or just about anything else...and sell it for a premium to those who appreciate it. Software is a bit different...because it has no 'sex appeal'.
Saying that he is safe because he is a 'lone coder' is analagous to advocating 'security through obscurity'. In short...he isn't safe, and it isn't secure.
While we've all seen 'success' stories through shareware or non-traditional publishing, it doesn't mean that he is immune from prosecution from some 'IP ' lawyer (there are companies now that do this as their sole source of revenue)...he needs to innovate something new, patent it before publishing, then publish. Then his method of remuneration is irrelevant with regards to being sued...it's solely a function of how well he markets, and how necessary/good/needed his software is.
Feel better?
Seriously though, the one good thing I can think of about all this ridiculous IP litigation is that it actually can drive a good 'lone coder' to really innovate as opposed to create the same old mouse trap in a different way.
In either case, good luck to you. Make us proud.
No I'm not, and no I'm not.
GigEth of course works great in a LAN situation...it wouldn't be used in any other. It has a distance limitation of 100 meters per segment. This has nothing to do with TCP. My point was, the author was saying that 'today's bandwidth' was too much for TCP...when, in fact, most home connections max out at about 6Mb in one direction, and real world throughput on GigE (using TCP) has been clocked as high as 600Mb, and usually ends up being hardware (PC bus) limited. Hence my 'two orders of magnitude' statement
TCP windowing is not a function of RTT, other than the fact that a timout will cause a retransmit, and resizing. That TCP timeout is configurable. TCP starts small, and works its way up in window size until it either hits the max configured window size, or fails to get an ack. No ACK=downsize and resend.
The 'inherent physics' of light that you refer to are a known quantity. Average RTT from coast to coast in the US is anywhere from 60 to 80 ms, depending on your provider, current congestion, and specific hardware latency at each hop. If your TCP RTT limit is set at or below those levels, I'm amazed it works at all.
TCP doesn't use RTT to 'calculate congestion'.
This is a load of fluff, trying to capitalize on the 'p2p craze'. There are plenty of TCP replacements out there, that actually make sense. As far as TCP not being able to utilize 'today's bandwidth', again...hooey. Gigabit ethernet (when backed by adequate hardware, and taking advantage of jumbo frames) moves a HELL (two orders of magnitude) of a lot more data than your typical home broadband connection...using TCP.
not to pitpick, bit you really shouldn't call anyone a 'moran' until you learn how to spell it. Sorry for that...please continue,
BLPTTNNQEWR!
Now that I have the fluid out of my nose...I really wish I had thought of that.
You know, of course, that it's a one way ticket to (all points), they call...it...heavy et. al.