It is important to consider what you want in these online classes.
1) Are you looking to make a course accessible after the fact, or do you want to do distance learning (which is what it sounds like when you say "I'd just run Skype") where interaction is possible?
2) What types of courses are you making available? For example, some courses only need to a single camera on the teacher, other courses will need both teacher and/or power-point simultaneously, yet others will need video, chalkboard or whiteboard, and teacher, and others will also need the audience. Note also that some disciplines (math especially) use a lot of chalkboard, so you may need multiple cameras.
These are nontrivial considerations, and often overlooked. I've been recording my calculus lectures at my university (Stony Brook), which has Echo360. Unfortunately, our setup is (a) expensive, and (b) useless for my discipline (mathematics), because it cannot capture 16 feet of blackboard in a way that can be read later, especially if you also sometimes use a data projector (which I do). It works fine for power-point oriented lectures, but you can't do mathematics properly via power point, because students need to see the problems being worked, and need to refer to the beginning of the problem (so it doesn't fit on a single slide).
What has worked for me is to set up a pair of HD cameras in the back of the room, pointed so each can see (part of) the blackboard. Then I post-process this into a single video stream later. If I am using a data projector, I also grab the stream from Echo360. (I've also made multiple synchronized streams on a web-page using JWplayer, but this doesn't work as well)
Unfortunately, this is not a turn-key solution.
Something like matterhorn might be helpful too, but you really need consider all of the content needs before deciding on a delivery mechanism.
There once was a hacker named Hans,
who taught his trees how to dance.
When unlinking filenames, each inode proclaims,
"It's like I have fire in my pants!"
Well, it isn't clear that this is the 3rd. There is also a href="http://climateprediction.net">climate prediction project with a port to BOINC that
is currently in alpha test. It isn't clear to me which of these two projects will go with a public beta first (or maybe some other project entirely).
Lorenz has said his choice of metaphor was not influenced by Bradbury's story (he hadn't read it). Indeed, he first phrased the idea using a seagull, not a butterfly.
But the Lorenz
Attractor looks like a butterfly from certain angles, and not at all like a seagull!
At least on BSD 4.2-derived Unices (I'm a newcomer, only using *nix since around 1984 or so) such as SunOS, the file encryption command crypt(1) did indeed use an Enigma-like algorithm, while the password encryption (and the library call crypt(3))
used DES.
The enigma-like crypt was still present in SunOS 4.1.3 (circa 1990). Here is an excerpt from the man page for crypt(1) :
crypt implements a one-rotor machine designed along the
lines of the German Enigma, but with a 256-element rotor.
Methods of attack on such machines are widely known, thus
crypt provides minimal security. The transformation of a key into the internal settings of
the machine is deliberately designed to be expensive, that
is, to take a substantial fraction of a second to compute.
However, if keys are restricted to (say) three lower-case
letters, then encrypted files can be read by expending only
a substantial fraction of five minutes of machine time.
When I was a cubscout leader, I stumbled on a cool idea used in a ceremony. Soak a cloth in a mixture
of 40% acetone and 60% water (keeping it in a sealed jar so the acetone doesn't evaporate). Then you can light it on fire, and the evaporating acetone burns, but the cloth itself doesn't. A link to the details in the context of cubscouts is here
Slashdot Mirror
These are nontrivial considerations, and often overlooked. I've been recording my calculus lectures at my university (Stony Brook), which has Echo360. Unfortunately, our setup is (a) expensive, and (b) useless for my discipline (mathematics), because it cannot capture 16 feet of blackboard in a way that can be read later, especially if you also sometimes use a data projector (which I do). It works fine for power-point oriented lectures, but you can't do mathematics properly via power point, because students need to see the problems being worked, and need to refer to the beginning of the problem (so it doesn't fit on a single slide).
What has worked for me is to set up a pair of HD cameras in the back of the room, pointed so each can see (part of) the blackboard. Then I post-process this into a single video stream later. If I am using a data projector, I also grab the stream from Echo360. (I've also made multiple synchronized streams on a web-page using JWplayer, but this doesn't work as well)
Unfortunately, this is not a turn-key solution.
Something like matterhorn might be helpful too, but you really need consider all of the content needs before deciding on a delivery mechanism.
There once was a hacker named Hans,
who taught his trees how to dance.
When unlinking filenames, each inode proclaims,
"It's like I have fire in my pants!"
I've already had a quantum computer for a while. Of course, it only works one bit at a time and needs a lot of cats. Here's a picture of it: http://www.math.sunysb.edu/~scott/Quantum/schrodin ger.png
Well, it isn't clear that this is the 3rd. There is also a href="http://climateprediction.net">climate prediction project with a port to BOINC that is currently in alpha test. It isn't clear to me which of these two projects will go with a public beta first (or maybe some other project entirely).
But the Lorenz Attractor looks like a butterfly from certain angles, and not at all like a seagull!
The enigma-like crypt was still present in SunOS 4.1.3 (circa 1990). Here is an excerpt from the man page for crypt(1) :
When I was a cubscout leader, I stumbled on a cool idea used in a ceremony. Soak a cloth in a mixture of 40% acetone and 60% water (keeping it in a sealed jar so the acetone doesn't evaporate). Then you can light it on fire, and the evaporating acetone burns, but the cloth itself doesn't. A link to the details in the context of cubscouts is here