www.newslettercartoons.com has a pretty good selection of cartoon suitable for business presentations. You can browse by category; see, for example, security cartoons. The artist, Ted Goff, licenses his work at various rates that depend on whether the use is for a presentation, newsletter, magazine, etc.
We describe an efficient technique that automatically detects duplicated regions in a digital image. This technique works by first applying a principal component analysis to small fixed-size image blocks to yield a reduced dimension representation. This representation is robust to minor variations in the image due to additive noise or lossy compression. Duplicated regions are then detected by lexicographically sorting all of the image blocks. We show the efficacy of this technique on credible forgeries, and quantify its robustness and sensitivity to additive noise and lossy JPEG compression.
[via Simson Garfinkel]
A colleague of mine discovered that a scripting error had caused a few months of his Apache access logs (compressed with gzip) to get transferred in FTP ASCII mode before being archived to DVD. He asked whether there was any hope for recovery.
Those FTP transfers corrupted about 0.4% of the input bytes. Because every bit counts in a compressed file, these errors send the gzip/inflate decompressor “into the woods” pretty quickly, and every error disrupts the expansion of everything afterwards. The output turns to unrecognizable gibberish almost immediately. The decompressor itself doesn’t know it’s lost until the final crc check. (There are few illegal states on the way; if there were, that would mean that there is redundancy in the data, and a compressor’s job is to find redundancy and squeeze it out.)
The state of the art among the numerous “zip file repair programs” out there seems to concentrate on only two easy fixes (please correct me if I’m wrong):
Neither of these does anything to improve corrupted data.
In the general case, solving this problem by brute-force search through all possible repairs is not feasible; unless the file is small, it’ll still be running when the lights go out on the universe. It turns out, though, that if the data has some structure, that’s enough to prune most of the search tree, and prioritize the rest, so that the highest-probability possibilities are tried first.
Apache access logs have plenty of structure, so my colleague got back a close match to his original data. I’ve documented the process (look here for slightly more detail) to offer hope to others in difficult cases of critical data in otherwise hopelessly damaged files. Unfortunately it’s not a turn-key process, each case requires a certain amount of tuning based on the cause of the corruption and the structure of the data.
A great OS demo anecdote from Bryan Cantrill that starts with the true observation that:
One of the downsides of being an operating systems developer is that the demos of the technology that you develop often suck. (”Look, it boots! And hey, we can even run programs and it doesn’t crash!”)
and continues on with a story about a core dump in front of customers.
I am taking these on vacation:
Here’s a 10% discount at Amazon if bought by August 3, 2004.
Daniel Berrangé: A Comparison of features for the current generation of operating system trace tools (Solaris 10 and patched Linux)
[ via Bryan Cantrill]
MIT Technology Review:
Mars Rover Image Interfaces
[Thanks to Dave Winer for the link.]
The ITIL (IT Infrastructure Library) and ITSM Directory web site has many other useful pointers, including some links to ISO 17799 material. “The IT Infrastructure Library, ITIL (®), is a series of documents that are used to aid the implementation of a framework for IT Service Management (ITSM).”
Via Dann Sheridan: ITIL Self Assessment:
The self assessment should be used continuously to measure the progress toward the initial ITIL implementation objectives. It takes about an hour and a half for one person to complete. Relatively speaking, ita good way to get a quick read on the state or your IT processes
See also ITIL Survival. (I also picked up that link from Dann Sheridan.)
Sigh,
LifeLog,
DARPA’s project to capture, store and interpret mounds of data collected on or about a person, is basically a good idea, and will happen one way or another on the road to augmenting human abilities with technology.
Wired News: Pentagon Kills LifeLog Project says it’s done. I deeply sympathize with critics over privacy concerns, but can we look at the merits and avoid knee-jerk reactions to every government project?
[See also Techdirt: DARPA Ditches Backup Brain Plans]
Has anybody else heard this: Our kids suddenly started wearing their PJs inside out. Turns out all the kids do it when they’re hoping for a snow day. It’s good luck, says the meme.
My kids added the embellishment of sleeping with a spoon under your pillow. It sure does make me wonder where these things arise and how long they’ve been circulating before I hear about it.
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