Domain: umich.edu
Stories and comments across the archive that link to umich.edu.
Comments · 1,427
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More securing OS X links/pdf's etc
http://www.nsa.gov/snac/
http://www.net-security.org/dl/articles/Securing_M ac_OS_X.pdf
http://eq.rsug.itd.umich.edu/software/radmind/
http://homepage.mac.com/hogfish/PhotoAlbum2.html
Best tip (not a flame) - simply don't run any Microsoft software, support open or other vendors software please, also W3C standards, thanks. -
Re:According to the Trolls (httpd.prc)
this references an older version, but might help (and it did work on my IIIxe a couple years back):
http://www.citi.umich.edu/u/rees/pilot/ -
Re:Plan. Test. Spec. Deploy.
Here's a starter link to a setup which is smaller but, in principle, fairly similar:
http://www.itd.umich.edu/umce/features/2004/cyrus. html
Finally, if you don't want to screw it up, ask someone who has done it before. Paying someone $300/hr for a 10-30 hour review of your plan is dirt cheap compared to horking the setup.
FYI, I am the architect of the above deployment (thanks for the props). I am 100% in agreement about the 10-30 hour review idea, $/hr negotiable. :) :w -
Plan. Test. Spec. Deploy.
(1) Plan an server setup which can handle the load. The requirements may change, but one million users is a fair bit. How much average incoming and outgoing emails is that? Figure that out, using a network sniffer or sniffers on existing traffic if need be (although logs should work). Then use this to calculate a number of servers needed for an outgoing smtp farm, an incoming MX farm. Figure out how much storage space is to be provided per user, and then figure out how you want that storage space to be accessible. Probably your best bet is to have a round-robin DNS farm of imap/pop servers which proxy connections based on the users login to a backend farm of actual mailservers responsible for storage. Plan the ability to move users from server to server to rebalance as needed. Outgoing smtp is a lot easier since you're not really storing things long term. Plan a web farm for webmail. (And pick software) Don't forget to plan some sort of backup, and make sure your system is flexible as far as email retention; chances are the email retention policy will change at some point and your setup should be able to change with it.
(2) Test. For each server, hammer it. Test it's load under as close to real world circumstances as you can. Then create unreal punishing loads and see how it handles it. Plan in advance for how your server farm handles something like virus-generated mass emails causing 1000% spikes in load.
(3) Using your testing results, spec out the actual hardware. RAID, cheap hardware, redundancy, etc. If you have control over the network choice, plan a location with multiple fiber trunks coming into the building and provider redundancy. Remember backhoes in concert? Don't get hit by that. Plan for server failures, drive failures, network failures, power failures, and security compromises.
(4) Deploy! If you did the rest right, this is the easy part. You'll have redundant network connections, HSRP, redundant switches, a proxy farm, an imap/pop farm the proxies connect to, an smtp farm for outgoing emails, and a web server farm for serving up webmail (depending on how you choose to architect the disk space, the web farm and the pop/imap farm may be one and the same; depends on how you set things up.)
Here's a starter link to a setup which is smaller but, in principle, fairly similar:
http://www.itd.umich.edu/umce/features/2004/cyrus. html
Finally, if you don't want to screw it up, ask someone who has done it before. Paying someone $300/hr for a 10-30 hour review of your plan is dirt cheap compared to horking the setup. Someone who has worked in huge email environments (a la, hotmail) could show you gotchas before they bite you. (If you need help figuring out who to ask, I could even point you to some of the appropriate people) -
Mod parent down, numbers wrong - H2 is 4X betterParents efficiency numbers are pulled out of the air.
Here are some real numbers:
* 55% efficiency of fuel->electric in combined cycle plant (powered by crude or gas)
* 85% efficiency of electrolysis
* 50% efficiency of a PEM fuel cell
* ~90% efficiency of an electric controller/motor
* 12% efficiency of an IC engine in an average drive cycle
* 40% efficiency of crude oil->gasoline
So comparing systems normalized on crude oil, and assuming the same transmission and friction losses in the vehicle:
* Crude->gas->ic engine->motion is about 4.8% efficient
* Crude->electricity->electrolysis->fuel cell-motion is 21% efficient. 4.3 times betterTo give an idea of how bad current vehicles are a 1995 Ford Taurus throughout the driving cycle only requires on average 6.3 kW (150 MPG) in motive energy, but only achieves ~28 MPG. And that is before addressing issues like reduced weight.
But more importantly hydrogen can be generated by solar, wind, or biological processes. Look at the economics. Wind can be purchased in bulk for ~3 cent/kWh. At 36.6 kWh/gallon gasoline equivalent and 85% electrolyzer efficiency: Hydrogen costs $1.10 per gallon of gas equivalent today using renewables . Right now that is sounding rather good. Not that hydrogen is the end all, but it is a good alternative to oil.
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collection points for various forms of assistance
Resources for Sharing Information and Offering Help
Katrina housing offers
Red Cross (a bit obvious, but just in case)
Next of Kin registry/a> -
Re:Bad science, bad thinking, illustrated.
Dude! Trivial, sophomoric and incomplete articles all over the place! If I wanted to read "science" articles aimed at grade school students, I'd read something more like this: http://www.umich.edu/~gs265/society/ozone.htm
Now this article, from the Universtiy of Michigan, no less, admits that naturally occurring chlorine is a threat to the the ozone layer. However it claims that naturally occurring chlorine only accounts for about 15% of the damage, yet doesn't say WHY that would be true. The diagram clearly shows that chlorine is the single element that "ping-pong's" (so to speak) between individual atoms and compound binding with ozone. The associated atoms such as flourine are only necessary (I'm using that word sarcastically) to provide a molecule for chlorine to get knocked out of so it can be free to associate with the ozone. If chlorine is the culprit element, and there are many millions of times as much naturally occurring chlorine than ever used to produce HFC's/CFC's, why is it more likely that the rare, heavy chemical is supposed to be the more likely cause? Most of the public literature is as loose and deficient as this one.
I do read the literature. I'm not a chemical researcher nor an atmospheric physicist, but I've been following both sides of the debate for a number of years now. I actually subscribe to a couple of lists that are devoted to sharing info and argument on this "ozone" problem. Molina and Sherwood are exemplary scientists, but I think we are possibly seeing a political bias on the part of so-called independent science. While I think there MAY be a connection between ozone depletion and HFC's/CFC's, I reserve the right to doubt the conclusion until my criteria are met: Explanations for "How does it get up there in quantities able to cause massive damage?"(with empirical proof that it does), "What are the actual proportions of CFC-produced chlorine to naturally occurring chlorine?" and (perhaps answered by explanation number two) "Why doesn't multi-million-fold greater quantities of naturally occurring chlorine produce a greater effect than HFC's/CFC's?"
BTW, are you in high-school or junior high maybe? Who else would think that Google is a sufficient resource on scientific research? -
Re:We can't even agree on global warming
What are the "normal" levels of ozone that should exist over Antarctica, and how do we know that those hypothetical levels are "normal"
There are four main radicals that break down ozone: Cl-, Br-, NO-, and OH-. Cl- is easily the most damaging - the chemical reactions involved are well understood. In the early 1970s, natural sources of Cl- were dominant (there are different source molecules - CFCs aren't made in nature). We've easily displaced them in terms of quantity, however - now, 84% of Cl ions are from CFCs.
At the same time, we've watched average antarctic ozone levels cut by a third, and minimum ozone levels cut by two thirds. Worldwide, levels were been cut by five percent in two decades, with the rate accelerating as stratospheric CFC concentrations increased.
What more do you need?
hockey stick graph
What is your obsession with some "hockey stick" graph? There have been thousands of studies, and you obsess over a single graph? The physics of global warming are apparent (CO2 *is* a greenhouse gas), its concentration has increased by 20% in the past century, we can model accurately how that much CO2 got there (the rate of influx vs. outflux), and we have ice cores that show an incredible correlation between CO2 concentration (as well as methane, another greenhouse gas) and temperature over the past several hundred thousand years. This is just the start of a summary of the literature, by the way - there is a *lot* more. Again, what more do you need? There's a reason that there's a near universal scientific consensus, and it's not a "hockey stick graph". -
Fraud in the Non-life SciencesScientific fraud also exists in the non-life sciences. Check out the classic analysis of results in computer-systems architecture.
At least, in the field of the life sciences, a paper that simply verifies a claimed result is considered to be a quality paper that is worthy of publication. In the field of computer architecture, virtually no one ever verifies another researcher's published results because verification is considered to be a dull waste of time. The consequence is that computer conferences like the International Symposium on Computer Architecture (ISCA) is fraught with extreme claims based on results from simulators that are considered "reliable" simply because they do not produce a core dump.
Worse, in addition to the non-incentive of verification, there is also the practical problem of using the right simulator. During the 1990s, the bulk of the wild claims in ISCA papers were based on the MIPS instruction set architecture (ISA). Most universities had SPARC machines and were ill-equipped to run the MIPS-based simulators. Alas, verification is virtually impossible.
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Re:Judge Approves Settlement in iPod Suit
It was an iPod suit!
No, really! Check it out: http://www.eecs.umich.edu/~jwinick/Halloween2004/ -
MOD PARENT UP
i should mention that the nytimes writer was presumably well aware that study was by someone of questionable ethics background (mentioned in the press) and had been viewed as flawed by other scientists and anyone with half-a-brain.
a full account is here.
yeah yeah shameless parent plug. -
Re:I'm not sure you have to be either
(.....Perhaps you could just give a brief outline.....) The Greenleaf treatise I was referring to was written to and dedicated to his fellow members of the legal profession. The URL below points to this introduction and dedication. If you are then so inclined, you may read or download all or parts of the work. Dr. Greenleaf lived from 1783 to 1853. Much of his work was published in collections after his death. http://www.hti.umich.edu/cgi/t/text/pageviewer-id
x ?sid=32a9d7f2f1cd32163b53e7a19c08b133&idno=aga1251 .0001.001&c=moa&cc=moa&q1=our+profession+leads+us& seq=7&size=s&view=text -
Re:Links would have been nice
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Procedural textures
I was a bit taken aback by Carmack's opposition to procedural textures. No, they can't do everything but they can be real timesavers when you need to add some overall realistic looking details. Things like dirt, "roughness" and stains can be done effectively using Brownian noise and the like, and you've got the infinite resolution, low-memory features of procedurally generated data. It's efficient and looks good, especially when I used it to create realistic terrain.
Of course procedural textures can never replace hand-painted detail, but layering on some infinite-resolution noise-detail onto a finite sized bitmap texture really brings materials to life. -
Re:Did anyone read TFA
Where can I get their software that cheap?
http://showcase.itcs.umich.edu/pages/microsoft/pri celist.html -
Re:It just occurred to me.
is that something like Systrace?
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Re:Third Post
Completely false. Here's the primary datafile used to generate that graph. Graphed CO2 levels are from measured, direct trapped CO2 in the ice. Graphed temperature is determined by the proportion of heavy water ice (oceans are richer in heavy water and glaciers poorer in it because of selective evaporation (the heavier the water, the harder it is to evaporate); the colder the climate, the more pronounced the effect).
Next time, don't just make stuff up when you want reply to a post, ok? -
Increase efficiency with fresnel lense
Just spit balling but couldn't fresnel lense technology (Giant Fresnel Lense) be used to increase efficieny, or reduce the size of the dish. Then use fly wheel technology to store excess energy for night time use.
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Re:Modern myth?
According to what I learned in college: "If oxygen were to reach a value of 30% of atmospheric gas composition, fires would occur whenever a lightning bolt hit humid vegetation."
http://www.globalchange.umich.edu/globalchange1/cu rrent/lectures/Gaia/#EXAMP
So there is some truth to that. -
Congress Silliness? Like Indiana's legislating Pi?
Isn't this a bit like the 1897 farcical attempt of Indiana to legislate the value of ð (Pi)?
Silly US legislature.
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Re:wait, that doesnt make senseWasn't australia FOUNDED by outlaws?
Technically Oz was founded by Brits (just like the US), first as a penal colony when the prison ships anchored on the Thames started to stink up the London gentry's riverside properties. Later waves of immigration (mainly in Victoria) accompanied the Australian gold rush. Of course, long prior to this there was a wave of immigration during the melanesian expansion that led to the Aboriginal population.
Anyways.... I personally am rather surprised that the Aussie government is complaining about GTA; after all, they have a fine tradition of road warrior fiction.
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Re:fuck me if i'm wrong...
Yeah! I was moderating that discussion... and then I told me comments don't exist... find the journal section... then the article dissappeared off my front page and the developers page... Sure it was a "nothing to see here article" but nonetheless.
A much more interesting story is that The North American Solar Car Rayce Just finsihed with a 45 second difference between U of M's Momentum and U of MN's Borealis III (sp?) Once the penalties are assesed and the other racers finish an annoucement will appear.
NASC site
Umich's blog
Place for timing results
Finish Line GPS page (autorefreshing) -
Re:What does the K stand for?
Knowing how to make a clean, superior desktop environment.
You mean something like this?? -
Re:Wasn't this obvious?
Yep. Search for 'XXX chromosome'; returns no porn on front page, and this in the first 10 results: http://www.med.umich.edu/1libr/yourchild/xxxsyn.h
t m -
It's a classic Straw Man Fallacy
Microsoft know this; they frame the fight so that when they say "Linux" they mean all Linux-based distributions.
Someone with a good philosophy background might identify this better than I can, but I think the accepted term for this is a Straw Man argument.
ie. Microsoft creates a caricature to their own liking and calls it "Linux", even though it isn't. Then they knock it down by highlighting all of the flaws that their invented caricature has.
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NOT The First Ricoh Sustainable Development Award
This is NOT the first ever Ricoh Sustainable Development award. This is simply the first time it has been awarded at a national science fair, although my partner and I (high school freshmen at the time) won this award at the Southeast Michigan Science Fair earlier this year for a project called "Magic Mushrooms."
http://www.sciencefair.research.umich.edu/SR_Award s2005.html -
Re:DuhThe pro-nuker "kooks" just point out that countries like France generate 76% of their electricity with nuclear power, without using coal like the USA does.
There is more energy in the uranium and thorium spewed out from the black belched smoke in a coal power plant than in the coal which it burned. We are literally pissing gold away.
Nuclear power is the safest way of generating electricity per GWhr we have.
Nuclear fission power alone could fullfill all our present energy requirements. Of course, this is not what would happen in the real world. For example, France uses hydro power for most of the other 24% of the electricity they require. Wind power is also economical in the right places. I have little doubt we will eventually turn to biodiesel for transportation, even if for no other reason, it is energy dense and works on current internal combustion engines. But trying to devise an economy without fossil fuels (coal, natural gas, petroleum) using existing technology without putting nuclear power into the mix is *not* going to work.
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Re:Clothing from the US?
The higher wages of multinationals, of course, does not come from their own generosity, or even out of concern about anti-sweatshop group, but from the simple fact that they are more productive than smaller, less advanced domestic producers in developing countries.
The literature is rich with studies that show higher wages of multinationals:
'Technological competition' causes U.S. multinationals to pay more
Even critics of Nike, whose wages and working conditions have become a cause celebre on college campuses, concede that the footwear giant pays higher rates than those prevailing in Asia, where their plants are located. The same pattern is found among multinationals with factories in South America and Eastern Europe.
"The wage differences between multinationals and domestic firms," writes Dan Bernhardt, a University of Illinois economist, "far exceed the differences in rental payments for buildings and land, or prices paid for domestic raw materials by foreign firms compared with their local counterparts."
Effects of Multinational Company Investments
For example, considering the charge that foreign investment leads to depressed wages and thus exploits "host country" workers, Lipsey finds that the opposite is true. "Within host countries it has been abundantly shown that foreign-owned firms pay higher wages than domestically-owned firms"
The Effects of Multinational Production on Wages and Working Conditions in Developing Countries
This evidence indicates that multinational firms routinely provide higher wages and better working conditions than their local counterparts -
Technology: Pro/Con
this is awsome. i spent many years of my youth enjoying scotland yard. a truly fantastic game; get the boardgame or get the recent OS independent python implmeneted London Law free computer game remake (as mentioned on slashdot).
the down sides:
- cell phone reception in the tube: ass.
- planting RFID clues will get you shot as a terrorist.
- (generall) RFID lacks sufficient range to be truly useful for this
it'd be much cooler if you could start tagging the real world & leaving markups on things. subways, unfortunately, while one of the coolest places to do this, are also some of the most likely to get you shot on sight for being a terrorist.
myren -
umich.edu
Umich Team Car Photos
We're gonna win!!! -
home team
Me too.
(FYI, the Michigan team has won the race numerous times, and has a budget exceeding $1 million.) -
MFile
The University of Michigan's Web AFS system. Kerberos based authentication, although it can use LDAP as well, using widely available AFS clients as well as a web interface.
http://mfile.umich.edu/ -
Re:What will the EU do?
I'm sorry, I missed that passage in my Bible where it tells me to "slaughter Muslims". Could you kindly point me to it?
Given that Mohammed lived hundreds of years after Christ, you'll have a difficult time finding that one; as I suspect you know.
But (some) evangelical Christians believe that Christ cannot return for the second coming until all Jews return to Israel; which is, therefore a state created by the will of God. Which is, therefore, perfect, and can do no wrong. I have had one such Christian explain to me (with a straight face) that Israeli soldiers have never, ever killed (or even shot at) an innocent (or even unarmed, stone-throwing) civilian on purpose, that the Palastinian houses are only ever knocked down if they are booby trapped by terrorists, and that the Israeli soldiers then build new houses out of their own pockets.
Hence: Christian fundamentalism = support of Israeli no matter what = more attrocities committed against Palastinian civilians = more Palastinian terrorists = more attrocitices committed against Israeli civilians. Repeat.
I can tell you that Mohammed explicitly stated that Jews, Christians and Muslims were all "people of the same book", and that Jerusalem was a pretty nice (and very tolerant) place to live until several thousand heavily armed European Crusaders hoved into view and started eating babies -
Largest fish
Actually, I know it so, that the largest freshwater fish is the European sturgeon (Huso Huso), http://animaldiversity.ummz.umich.edu/site/accoun
t s/information/Huso_huso.html It can be well over 1000 kg. -
Re:$500 billion?
I think that that would be pointless.
It sure is convenient to blame automobiles. It's really quite wildly inaccurate though.
If you want to fix global warming.
1) Switch go power plants that don't use fossil fuels. They're utilities. You only have to replace a few. You can boost the enconomy doing so. We already have the technology to do this.
2) Change HVAC systems to something that is more friendly. We have reasonably good technology to do this.
3) After that, you've cut down emissions by (up to) 66%. If you really want to chase after automobiles, at this time, then you've got my blessing because you did the logical and rational thing. Of course, the technology will be better by the time you've knocked the first two out, but only because everybody is busily attacking the wrong problem.
Also, while you're taking care of #1, remember that building a hydroelectic dam requires you to dam up a river, potentially causing irreversible damage to the environment (flooding the homes of animals, changing the landscape). Windmills kill birds. Solar cells take up real-estate too. Do this right. Build a nuclear plant. They're clean and safe.
Oh yeah, remember, if yoy want to promote electric cars (not saying you do), remember that they need electricity from somewhere... like say a nice coal fired electrical plant. -
Re:Gutenberg doesnt have the geek classics
Also Google found this list: http://www.umich.edu/~umfandsf/other/m_etext.html
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Long answer:
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Multi-player Prisoner's DilemmaStart here.
There are at least 3 angles at work here, which require 3 different strategies (solutions): probablities (relatively easy); interactive competition (Multi-player Prisoner's Dilemma); bluffing (neural networks to deal with random -- or deliberate -- variations in other players' deviations from TitForTat). Each of these respectively requires a meta-level 'awareness' relative to the previous angle.
I daresay that solving this *overall* problem would require good (but not necessarily optimal) solutions to each of these 3 separate angles. So... who is going to host the First Slashdot Pokerbot Competition?
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Re:I'm sure no one will mind bringing...
Or, maybe they do have claws, and a t in the family name.
http://animaldiversity.ummz.umich.edu/site/account s/information/Mustelidae.html -
Re:Survey says,
By the way, angels are in the Bible and part of the basic Christian theology, so equating them in with belief in witches... in a derogatory manner is highly insulting. Your lumping of belief in God along with aliens also reveals your trollish, elitist slant is about as reputable as these garbage poll results.
I didn't insult you, Jack. Those were the questions on Fox News's poll, which I linked to.
But rather than follow the link, you chose to feel insulted, to blame me for it, and call be "trollish" and "elitist". So much for your cool temper, informed judgment, or reading comprehension, friend.
And in any case, witches are in the Bible too. Ten times in the King James Version.
The parent poster continues: 92% believe in God -- some people might take that as a hint that YOU are wrong.
A majority of people once thought heavier objects fell faster than light objects. Does that convince you they were right about that too?
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Nothing new...Some countries has already been using national ID:s for decades... The catch is the system behind the ID:s and the management of such systems.
Considering that the M$ environment is under constant pressure from various threats I would like to call the selection of that environment risky, and almost stupid. By selecting other environments you would be running the risk of being more dependent on a few persons with that particular competence. On the other hand the number of persons competent enough to cause trouble will also decrease significantly.
If I was involved I would have selected OpenVMS , now owned by HP as operating system for the servers running either MySQL or Oracle as a database and developing the software in Ada or (horrendous thought) Pascal or maybe Java.
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OpenVMS - The OS with longer uptimes than Microsoft support policies -
Re:You're proving my point...
Okay, you've got a deal. I'll check out 400 Blows. And I agree with your thoughts about "thinking" movies. Some of them would be on my top 100 list, though maybe not the same ones that are one other people's lists. I hope I conveyed that I try to at least put some effort into liking various genres, such as comedy, sci-fi, drama, horror, action, and so on. I've got to admit that like most XY's out there, I don't care too much for romantic comedies, but I won't deny that some of them are pretty good.
And for the record, no matter how much your cinematic taste leans towards the obscure or the popular, it will NEVER detract from the coolness of you juggling. Jesus, how I wish I could keep five pins in the air...
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Re:But does it support unicode ?.
The biggest pain I have is getting a single font (yeah, I don't mind a 20 MB font that works) which will work uniformly well with unicode text in different languages.
You mean, like Gentium? Or Doulos SIL?
The Unicode Font Guide for Linux should also give you some pointers.
Ulrik P. -
Re:Eat right in whose definition?
This http://med.umich.edu/umim/clinical/pyramid/index.
h tm food pyramid ist NOT stupid.
It's a "blue & green based" pyramid - contrary to those old "grain based" pyramids.
Even as an athlete you need only little meat - preferable "lean meat".
You can get B12 from dairy products and proteins and iron from both dairy products and legumes.
If you eat quite a lot of sea food you dont need any other meat at all.
Physical exercise and a well balanced food pyramid usually play hand in hand. To neglect one factor or the other is always not a good idea! Specific food IS an issue in these days of abundance and nearly unlimited food choice. -
Re:Updating software on Mac OS 10
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eerily similarI was actually on a team that launched the same kind of hacked Dakota digital camera on a weatherballoon last summer. Ours was through a Space Grant university program, about 15 schools with payloads.
Although we were (just barely) a grade above DIY, we had our share of problems. One of the balloons (not ours) lost its GPS transmitter, and had to be tracked otherwise. These went to around 100,000 feet. Ours had a bad parachute, which caused the camera to be wrecked when it crashed- we ended up desoldering the (surface-mounted) flash memory and putting it in a working camera to get our pictures. Definitely a fun project, though.
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Radmind
Radmind is exactly what you're looking for. It makes managing lab, office and kiosk machines a snap. It works on Linux, Solaris and OS X. I've been using it for years as have many other schools that use these operating systems. It's pretty easy to use (I had no real command line experience coming to use it on OS X, but do it all via command line now), fast and actively developed. Essentially it is a filesystem manager, but works with transcripts (essentially lists) of files and there is a priority system for what can override what. It gives you lots of control and is very scriptable. I highly suggest you check it out.
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Radmind
You can also use something like radmind. If you are using any sort of *nix desktops. It is much easier than having a Debain repo. Plus it would use a lot less bandwidth and is tested and used in Universities mainly.
There are also things called login scripts in the Windoze world when it comes to updating things like OpenOffice.org and Firefox. . . -
Re:Not replication
My furniture has been replicating itself for years.
http://www-personal.umich.edu/~dbsmith/furniture/s rb1.html -
Re:They have this in Indiana... it doesn't work...
Actually they tried to set it to 3.2 AND 16/7 * sqrt(2). Therefore sqrt(2)=1.4.
http://www-personal.umich.edu/~jlawler/aux/pi.html