If you have to reboot the entire thing you're fucked, right.
But if you reboot for a second, the bird won't plummet like a stone anyway: its feedback loops are closed through software normally, but it surely can operate in open loop, where pure analog electronics control the navigation and the feedback is given by the pilot ("classic" approach).
This sort of "redundancy" (not redundancy, but implementation of different functions in more than one way) is commonplace in space design, even unmanned (satellites).
For example, here at Surrey Satellite we use a microcontroller to keep the solar arrays of our satellites in their Maximum Power Point. In case of a failure, we still keep them near that point using pure analog, ie, measuring temperature and doing an estimation with opamps.
Thanks for the link! From my experience, I don't share that opinion but it is nice reading and it is good to know that I could possibly be wrong on this..
They better do an extremely good design because complex asynchronous digital electronics are extremely difficult to debug due to the inherent complexity of simulation and testing involved, as electrical signals become events in themselves, actually!
I've been programming electronics, mostly EPLD for different designs and I've found that even inside the same chip. Although sometimes asynchronous digitals are very convenient (and very nice, too), you have to very much more careful and pay much more attention, which ends being much many development hours.
I know nothing about holograms but, when I visited the Science Museum of London (please, do so if you ever come to the UK, it is a great visit: They have there huge machines capable of calculating second order differential equations mechanically and such stuff) I got really impressed with the optics part, showing PIECE of hologram where you could perfectly see the whole thing by choosing the correct angle. Really nice.
I've been designing electronics for aerospace for years both at government facilities and at private companies like my present, Surrey Satellite. Yes, in this small company we make entire spacecrafts, from micro and mini satellites (LEO) to big GEOs hopefully soon.
..And let me tell you that it is quite funny to hear the term "AMATEUR SATELLITE". Come on, what the hell is this supposed to be? If you put a satellite out in space and have it working for a couple of years then you are not an amateur regardeless of any other consideration.
The good thing the Internet has is the power to CHOOSE the contents you access. Moderate music files and you will have much more Spice Girls than Dizzy Gillespie. To eat "contents that people like / want to see" we usually just turn on the TV.
The way in which some moron decided what the human ear can detect and what not is plain stupid. Moreover, my experience as an electronics designer, musician and audiophile confirms the point.
Come on, I can tell you if a band is playing or it is only a CD from many meters distance only because of THE WAY it sounds, don't tell me shit about the limitations of the human ear. And I don't miss.
The story of how this was "decided":
1. To determine "our" freq range, let's produce sound at a certain constant level over frequency and let's see.
(Makes no sense to use constant level over frequency, our ear is much more complex. Just listen to music with the same amount of sound for the different frequencies: awful.)
2. To determine "resolution" or what is called dynamic range, let's first choose a freq. 1 kHz is OK, ear is most sensible to it and it is more or less centered in "our" freq range.
(Doing that at only one freq is definitely not sufficient. Our ear is much more complex and detects small signal changes in a different way for different freqs.)
3. Now we've got our freq, let's produce sound with the lowest level we can hear and then let's go as loud as we can without feeling pain. Let's express the quotient of both powers in dB=10*(p1/p2) (10 as we are using power, not voltage) and say that this equals to the minimum voltage dynamic range wee need (and therefore resolution).
(Again, doing that at only one low level is definitely not sufficient. Our ear is much more complex and detects small signal changes in a different way for different levels.)
This is pretty much the definition we've got and it really does not satisfy me. As an engineer, I have already said what I think. As an audiophile, I can well distinguish between a GOOD vinyl player playing a good recording and a good CD player playing a good recording. And I don't miss. As a consumer, I choose CD: They sound very well after all, they are VERY convenient-- lossless backups, easy to make care of, cheap players for the quality you get (although you can get much more quality with vinyl, a similar quality than that of a normal CD player is much more expensive in vinyl).
I understand "taking the sound from the speakers" as the way to explain something that will always be possible. If things get difficult and we need to think about D-A-D to protect OUR RIGHTS, we'll do it and that won't be a problem.
For CD quality, a good CD player line out going to a GOOD (Turtle Beach, for example) PC audio capturing card sounds GREAT. To me, it sounds identical from the CD than from the hard disk if I use the same format with no compression (MP3 sound is crap for me).
For the quality "required by" this new format, well, maybe we have to wait some months but we will have the technology, soon and cheap, sure.
Not at all! Lifetime of most space missions is limited due to the degradation of the different systems, specially the battery modules, even although often operated at a 15% to 25% depth of discharge. I am a power systems design engineer working for SSTL and we design our systems for the lifetime specified (plus some margin to play with..)
So this is about a new expensive motherboard with no RS-232 (so I can't connect it to my mobile phone, to my self-programmed microcontrollers and so on) and will not allow me to use open OSs but only Windows. Plain weird, I think that this makes no fscking sense.
Re:Cooking Your Placenta!
on
Space Wars
·
· Score: 1
Rock Linux doesn't allow you to choose what you install.
From the Rock Linux faq:
" 2.4. I don't want/need package X.
If for some reason you decide that you don't need a particular package, delete the directory./pkg-config// , then rebuild the./scripts/packages file by executing: ./scripts/Puzzle
Then execute the download script again. Please note that a lot of packages depend on the presence of other packages in order to compile successfully. It is your choice, but don't bug us if anything fails during compile... "
I just can't imagine if Woody had the same package management, 8 CDs..
Soon, we will be forced to have one of these implanted. Oh, well, I mean only if we want that job, want to live in that block of flats or want our children to go to that specific school, or..
This sig was generated by a Bunch of Goatse.cx Webmasters for trumpetplayer
I think you will find this funny. Many years ago, I switched from bicycle to SKATEBOARD for one only reason: AVOIDING MAINTENANCE (yes, mainly flats and so, but not kidding). And I stayed this way for years until I switched from skateboard to girlfriend.. who does cycling, so I switched back from skateboard to bicycle and still I remembered how to do it.
This sig was generated by a Team of Random Robots for trumpetplayer
..But now it is CHEAP, and THAT is new. It's some years now since I begun to be interested in home recording. When I started, you simply could not afford to put reverb, which is essential:-)
I've used this one for studio recording of a brass section and it's impressive. These boxes are very useful in amateur sections (brass, sometimes strings) because small pitch variations are usually awful when you hear several instruments with similar timbre.
Slashdot Mirror
"Easy.. small.. not as fragile"
And much much more reliable.
"I using mine as an apache web server. /. article :-)"
I would post the link but I really think it deserves its own
Nah, tell the truth: You didn't post the link because you don't want your floppy slashdotted.
If you have to reboot the entire thing you're fucked, right.
But if you reboot for a second, the bird won't plummet like a stone anyway: its feedback loops are closed through software normally, but it surely can operate in open loop, where pure analog electronics control the navigation and the feedback is given by the pilot ("classic" approach).
This sort of "redundancy" (not redundancy, but implementation of different functions in more than one way) is commonplace in space design, even unmanned (satellites).
For example, here at Surrey Satellite we use a microcontroller to keep the solar arrays of our satellites in their Maximum Power Point. In case of a failure, we still keep them near that point using pure analog, ie, measuring temperature and doing an estimation with opamps.
Oh yes, specially military, classified software.
Thanks for the link! From my experience, I don't share that opinion but it is nice reading and it is good to know that I could possibly be wrong on this..
They better do an extremely good design because complex asynchronous digital electronics are extremely difficult to debug due to the inherent complexity of simulation and testing involved, as electrical signals become events in themselves, actually!
I've been programming electronics, mostly EPLD for different designs and I've found that even inside the same chip. Although sometimes asynchronous digitals are very convenient (and very nice, too), you have to very much more careful and pay much more attention, which ends being much many development hours.
I know nothing about holograms but, when I visited the Science Museum of London (please, do so if you ever come to the UK, it is a great visit: They have there huge machines capable of calculating second order differential equations mechanically and such stuff) I got really impressed with the optics part, showing PIECE of hologram where you could perfectly see the whole thing by choosing the correct angle. Really nice.
"News alert: Some geeks like sport"
Other alert: "watching sports" is not sports in itself. (Be warned as it won't kill any overweight etc.)
I've been designing electronics for aerospace for years both at government facilities and at private companies like my present, Surrey Satellite. Yes, in this small company we make entire spacecrafts, from micro and mini satellites (LEO) to big GEOs hopefully soon.
..And let me tell you that it is quite funny to hear the term "AMATEUR SATELLITE". Come on, what the hell is this supposed to be? If you put a satellite out in space and have it working for a couple of years then you are not an amateur regardeless of any other consideration.
The good thing the Internet has is the power to CHOOSE the contents you access. Moderate music files and you will have much more Spice Girls than Dizzy Gillespie. To eat "contents that people like / want to see" we usually just turn on the TV.
The way in which some moron decided what the human ear can detect and what not is plain stupid. Moreover, my experience as an electronics designer, musician and audiophile confirms the point.
Come on, I can tell you if a band is playing or it is only a CD from many meters distance only because of THE WAY it sounds, don't tell me shit about the limitations of the human ear. And I don't miss.
The story of how this was "decided":
1. To determine "our" freq range, let's produce sound at a certain constant level over frequency and let's see.
(Makes no sense to use constant level over frequency, our ear is much more complex. Just listen to music with the same amount of sound for the different frequencies: awful.)
2. To determine "resolution" or what is called dynamic range, let's first choose a freq. 1 kHz is OK, ear is most sensible to it and it is more or less centered in "our" freq range.
(Doing that at only one freq is definitely not sufficient. Our ear is much more complex and detects small signal changes in a different way for different freqs.)
3. Now we've got our freq, let's produce sound with the lowest level we can hear and then let's go as loud as we can without feeling pain. Let's express the quotient of both powers in dB=10*(p1/p2) (10 as we are using power, not voltage) and say that this equals to the minimum voltage dynamic range wee need (and therefore resolution).
(Again, doing that at only one low level is definitely not sufficient. Our ear is much more complex and detects small signal changes in a different way for different levels.)
This is pretty much the definition we've got and it really does not satisfy me. As an engineer, I have already said what I think. As an audiophile, I can well distinguish between a GOOD vinyl player playing a good recording and a good CD player playing a good recording. And I don't miss. As a consumer, I choose CD: They sound very well after all, they are VERY convenient-- lossless backups, easy to make care of, cheap players for the quality you get (although you can get much more quality with vinyl, a similar quality than that of a normal CD player is much more expensive in vinyl).
I understand "taking the sound from the speakers" as the way to explain something that will always be possible. If things get difficult and we need to think about D-A-D to protect OUR RIGHTS, we'll do it and that won't be a problem.
For CD quality, a good CD player line out going to a GOOD (Turtle Beach, for example) PC audio capturing card sounds GREAT. To me, it sounds identical from the CD than from the hard disk if I use the same format with no compression (MP3 sound is crap for me).
For the quality "required by" this new format, well, maybe we have to wait some months but we will have the technology, soon and cheap, sure.
"A complete meltdown is a disaster, but not the end of the world."
Oh well, the why worry.
Not at all! Lifetime of most space missions is limited due to the degradation of the different systems, specially the battery modules, even although often operated at a 15% to 25% depth of discharge. I am a power systems design engineer working for SSTL and we design our systems for the lifetime specified (plus some margin to play with..)
> It seems "only" the company has to give up. The system will live on - in a more exotic location
Sure, as it was supposed to happen to Napster.
AATTZZ
OK
(That was echo, in the good old days of BBSing.)
So this is about a new expensive motherboard with no RS-232 (so I can't connect it to my mobile phone, to my self-programmed microcontrollers and so on) and will not allow me to use open OSs but only Windows. Plain weird, I think that this makes no fscking sense.
Qué asco colega.
Rock Linux doesn't allow you to choose what you install.
./pkg-config// , then rebuild the ./scripts/packages file by executing:
From the Rock Linux faq:
"
2.4. I don't want/need package X.
If for some reason you decide that you don't need a particular package, delete the directory
./scripts/Puzzle
Then execute the download script again. Please note that a lot of packages depend on the presence of other packages in order to compile successfully. It is your choice, but don't bug us if anything fails during compile...
"
I just can't imagine if Woody had the same package management, 8 CDs..
The screenshots rule. Oh, btw, Head & shoulders shampoo is cool, I choose Head & shoulders shampoo.
Debian is a full OS, not a kernel. After all, it's a complete **""GNU""!!**/Linux distribution :-))
Soon, we will be forced to have one of these implanted. Oh, well, I mean only if we want that job, want to live in that block of flats or want our children to go to that specific school, or..
This sig was generated by a Bunch of Goatse.cx Webmasters for trumpetplayer
I think you will find this funny. Many years ago, I switched from bicycle to SKATEBOARD for one only reason: AVOIDING MAINTENANCE (yes, mainly flats and so, but not kidding). And I stayed this way for years until I switched from skateboard to girlfriend.. who does cycling, so I switched back from skateboard to bicycle and still I remembered how to do it.
This sig was generated by a Team of Random Robots for trumpetplayer
..But now it is CHEAP, and THAT is new. It's some years now since I begun to be interested in home recording. When I started, you simply could not afford to put reverb, which is essential :-)
I've used this one for studio recording of a brass section and it's impressive. These boxes are very useful in amateur sections (brass, sometimes strings) because small pitch variations are usually awful when you hear several instruments with similar timbre.