Just because you have a good model of a system doesn't necessarily mean that it's easy to design a controler that stabilises it. Especially when there's a lot of non-linear croos-coupling and, for this particular system, probably large changes in the dynamics over the flight envelope.
Well being one of the students working on SSETI-Express and also on cubesats I respectfully disagree.
The cubesat AAUSAT-IIthe we (the students at AAU AAU) are working on includes systems that are more advanced than many commercial satellites.
The communication system utilizes a CAN-bus which is something NASA is still doing feasability studies on. The attitude determination and control system provides full three axis stabilisation and control using magnetorquers and momentum wheels for actuation and sunsensors, magnetometers and gyros for sensing. This is also a first, especially in a 10x10x10cm cube with a mass of 1 kg. The payload is a gamma ray burst detector from DSRI, danish space reasearch institute www.dsri.dk, which is being tested and spacequalified on this launch.
I think you should try to figure out how you would put: EPS (Electrical Power System)
- solar cells
- batteries
- power conditioning
- power distribution
COM
- Antennas
- Transmitter
- Receiver
- Modem
ADCS (Attitude determination and control)
- Sun sensors
- Gyros
- Magnetometer
- Magnetorquers (coils)
- Momentum wheels (motors + flywheels)
- Various filtering, sensorfusion and control algorithms.
OBC (On Board computer)
- Microprocessor system
- Command and data handling
- Fault tolerance
- Software upload (in orbit)
Payload
- Actual payload
- + interfacing electronics
At Aalborg University which i attend everything is teamwork.. about 2/3 of your semester grade us evaluated on the basis of a Problem oriented group project.
This means that you have to work together with 6 or 7 people on a projekt. You have to "agree" on everything, cause we are all equally responsible for the outcome.
After the paper has been turned in app. 100-120 pages + product, there is a 5 hour exam.
At this exam you present your project and your project-counsler and a sensor asks questions. After the exam each student is individually graded.
Ofcourse there are upsides and downsides to this approach, but as a whole you learn a lot because you are forced in to discussing almost every decision. OTOH some students can get by pretty easely and lets his group do the work. (It is possible to kick someone out of your group if the don't take their part of the work, or always comes in late. etc.)
Anyways, if you like working in groups come to Aalborg University, Denmark.
Sorry.. your right!
I meant the GUI.. I think it is called Darwin or something like that.
Anyways... i really think the learning curve for linux is too steap.
X helps a bit, but last time i tried to install Debian, i couldn't install X.
I tried to apt-get enligthenment and everything else x relevant i could think of, but it turned out that the dependencies where broken:(
That's just way too annoying and time consuming.
I think linux as a desktop right now can be diskribed best as 'Three dead Trolls in a baggie' did. in their song 'every os sucks'
"Now there is l*nix or linux
i don't know how you say it,
or how you install it or use it or play it
or where you download it or what programs run,
but l*nix og linux don't look like much fun.
However you say it it's getting great press
Though how it survive this is anyones guess. Now if you ask me it's great big mess for elitist nerdish smucks."
hehe
and here comes the golden line:
"It's free they say if you can get it to run,
the geeks say, Hey that's half the fun,
yeah but i got a girlfriend and things to get done!"
Not that i really got a girlfriend, but i got things to get done.
it continues:
"The linux OS sucks!
Im sorry to say it but it does"
Well i better stop ranting.. i actually got things to get done.. projekt due on monday!
That was quick.. what about Mac OSX. If it's in some way ported to linuxi wouldn't quite say Linux can't make a good desktop.. Personally i say give it a chance...
Yes, it's not doing well now on many points.. that is porb why I am running windows, but if it keeps developing, with that speed, i might just switch some day soon.
The EU is actually working on such a solution, because there is to much paperwork in translating all documents into 15 languages. The idea is to make a new "middle" language, so when i type a document in danish the computer translates it to the middle language, and then when someone from France want's to read it, he just opens the document, and it is translated from the middle language to French.
The middle language is just for computers, and is not supposed to be read or understood by any human. It consists of words which gives a 100% clear diffenition of what they mean, and this makes missunderstandings almost impossible, in fact they say that you even can use metafores and they will be understood.
It becomes even cool'er cause they are also developeing the system for voice recognition, an thus eliminating all use of translators... too bad for them:)
This could be a really fun top 10.. antihacks like ms win 1.0
or
The guy who hacked a big unix server, put rc5 on it making it send the packages registered in his e-mail (duh) of course he was caugth. When a server runs @ 100% cpu usage all time the sysadmin is bound to notice..and he set the prog up whit his own email..an otherwize neat hack gone wrong.
The music the music the music. Never ever have i heard soo good music in demo, animation or even a track. Everytime i drive to a Demo party it is the music heard. This is defenetly the best demo ever made. Great graphics, and incredible music. Makes me wan't to se it again and again and again. This demo really decervse to be in the top ten hacks of all time. P.S. i concider it a lack of education not to have seen or heard it:)
Slashdot Mirror
From TFA:
./?
Assignee: Intel Corporation (Santa Clara, CA)
So what happened to actually reading the submission before posting them on
Also Skype is from 2002 and the patent was filed in 2000, so that makes for a poor prior art.
Just because you have a good model of a system doesn't necessarily mean that it's easy to design a controler that stabilises it. Especially when there's a lot of non-linear croos-coupling and, for this particular system, probably large changes in the dynamics over the flight envelope.
Well being one of the students working on SSETI-Express and also on cubesats I respectfully disagree.
:-)
The cubesat AAUSAT-IIthe we (the students at AAU AAU) are working on includes systems that are more advanced than many commercial satellites.
The communication system utilizes a CAN-bus which is something NASA is still doing feasability studies on. The attitude determination and control system provides full three axis stabilisation and control using magnetorquers and momentum wheels for actuation and sunsensors, magnetometers and gyros for sensing. This is also a first, especially in a 10x10x10cm cube with a mass of 1 kg.
The payload is a gamma ray burst detector from DSRI, danish space reasearch institute www.dsri.dk, which is being tested and spacequalified on this launch.
I think you should try to figure out how you would put:
EPS (Electrical Power System)
- solar cells
- batteries
- power conditioning
- power distribution
COM
- Antennas
- Transmitter
- Receiver
- Modem
ADCS (Attitude determination and control)
- Sun sensors
- Gyros
- Magnetometer
- Magnetorquers (coils)
- Momentum wheels (motors + flywheels)
- Various filtering, sensorfusion and control algorithms.
OBC (On Board computer)
- Microprocessor system
- Command and data handling
- Fault tolerance
- Software upload (in orbit)
Payload
- Actual payload
- + interfacing electronics
Mechanical structure
- Harness
- Structure
- Thermal analysis
All fitted into a cubesat (10x10x10cm) max 1 kg.
Ohh.. and when you're done, you have to space certify it all
Good luck
At Aalborg University which i attend everything is teamwork.. about 2/3 of your semester grade us evaluated on the basis of a Problem oriented group project.
This means that you have to work together with 6 or 7 people on a projekt. You have to "agree" on everything, cause we are all equally responsible for the outcome.
After the paper has been turned in app. 100-120 pages + product, there is a 5 hour exam.
At this exam you present your project and your project-counsler and a sensor asks questions. After the exam each student is individually graded.
Ofcourse there are upsides and downsides to this approach, but as a whole you learn a lot because you are forced in to discussing almost every decision. OTOH some students can get by pretty easely and lets his group do the work. (It is possible to kick someone out of your group if the don't take their part of the work, or always comes in late. etc.)
Anyways, if you like working in groups come to Aalborg University, Denmark.
Yes, Denmark is a part of Scandinavia, as it is a part of Europe. I'm wondering if you think Scandinavia is a country, because it's not.
Anyways the Niels Bohr Institute for Astronomy, Physics and Geophysics is in Copenhagen Denmark.
Sorry.. your right! I meant the GUI.. I think it is called Darwin or something like that. Anyways... i really think the learning curve for linux is too steap. X helps a bit, but last time i tried to install Debian, i couldn't install X. I tried to apt-get enligthenment and everything else x relevant i could think of, but it turned out that the dependencies where broken :(
That's just way too annoying and time consuming.
I think linux as a desktop right now can be diskribed best as 'Three dead Trolls in a baggie' did. in their song 'every os sucks'
"Now there is l*nix or linux
i don't know how you say it,
or how you install it or use it or play it
or where you download it or what programs run,
but l*nix og linux don't look like much fun.
However you say it it's getting great press
Though how it survive this is anyones guess. Now if you ask me it's great big mess for elitist nerdish smucks."
hehe
and here comes the golden line:
"It's free they say if you can get it to run,
the geeks say, Hey that's half the fun,
yeah but i got a girlfriend and things to get done!"
Not that i really got a girlfriend, but i got things to get done.
it continues:
"The linux OS sucks!
Im sorry to say it but it does"
Well i better stop ranting.. i actually got things to get done.. projekt due on monday!
That was quick.. what about Mac OSX. If it's in some way ported to linuxi wouldn't quite say Linux can't make a good desktop.. Personally i say give it a chance... Yes, it's not doing well now on many points.. that is porb why I am running windows, but if it keeps developing, with that speed, i might just switch some day soon.
The EU is actually working on such a solution, because there is to much paperwork in translating all documents into 15 languages.
:)
The idea is to make a new "middle" language, so when i type a document in danish the computer translates it to the middle language, and then when someone from France want's to read it, he just opens the document, and it is translated from the middle language to French.
The middle language is just for computers, and is not supposed to be read or understood by any human. It consists of words which gives a 100% clear diffenition of what they mean, and
this makes missunderstandings almost impossible, in fact they say that you even can use metafores and they will be understood.
It becomes even cool'er cause they are also developeing the system for voice recognition, an thus eliminating all use of translators... too bad for them
This could be a really fun top 10.. antihacks like ms win 1.0
or
The guy who hacked a big unix server, put rc5 on it making it send the packages registered in his e-mail (duh)
of course he was caugth. When a server runs @ 100% cpu usage all time the sysadmin is bound to notice..and he set the prog up whit his own email..an otherwize neat hack gone wrong.
The music the music the music. Never ever have i heard soo good music in demo, animation or even a track. Everytime i drive to a Demo party it is the music heard. This is defenetly the best demo ever made. Great graphics, and incredible music. Makes me wan't to se it again and again and again. This demo really decervse to be in the top ten hacks of all time. P.S. i concider it a lack of education not to have seen or heard it :)