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* Posts by Michael H.F. Wilkinson

1891 posts • joined Tuesday 24th April 2007 14:31 GMT

Michael H.F. Wilkinson
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cue

X-rated versions of these which "pulsate" when watching .......

Michael H.F. Wilkinson
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Shouldn't that be

Al Arsi, the arsassin?

Michael H.F. Wilkinson
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Black Helicopters

@Phil Rigby: Why only war?

- Assuming that we can get a fool-proof system, why is the first practical use have to be for a war/military solution?

Answer: only fools make war

Michael H.F. Wilkinson
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Boffin

@The Other Steve; @Brian Miller

@The Other Steve: Nice one, Dijkstra on the other hand got angry when you suggested testing something he had proved.

@Brian Miller: Not a flaw at all. It is possible to write secure C, just as it is possible to write secure assembly (after all, any secure code must be secure machine code at the final crunch). So long as you have a secure C compiler (mathematically correct) you are OK. Exactly because C is so small, as a language, it is less hard to prove correct.

Michael H.F. Wilkinson
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Boffin

@Keith T; @AC: A few replies; + "Authentication + , Identification -"

@Keith T : see my earlier comment on why this does not work, also the AC mentioned below

@AC: A few replies: No computer scientist dealing with computer vision or other pattern recognition tasks would think the way you suggest computer scientists think.

Finally: I do think biometircs, in particular iris scans can help in authentication, though more research is needed to reduce the failures in enrolement. I remember John Daugman complaining he had studied more eyelashes (especially Asian ones, which do not curl up as much, and therefore occlude the iris) than anybody in the world.

In identification I have severe doubts

Michael H.F. Wilkinson
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Boffin

@Too much egg: I actually do pattern recognition

I am afraid Julian might do stuff, but he does not understand how matching works. Almost all biometrics encode a series of spatial relationships between features. These relationships are rarely completely rotation or scale invariant (i.e. they depend on pose, camera angle etc.), therefore, you cannot map each set of parameters to a single number which you then sort. Instead, you need to match the multivariate data using some distance measure. If the distance is too large, we have a mismatch.

Iris patterns are a good example. Rather than coding to a unique number, you need to verify that the hamming distance between the two sets of bit patterns fails a test for statistical independence. Because the iris might be recorded in a slightly different orientation each time, you need to compute the hamming distances for a series of shifted combinations, and take the smallest distance to indicate the correlation.

Thus 1.8 x 10^15 is correct.

I agree with the author: the scheme is doomed to failure

There is an explanation for the politicians' and civil servants' behaviour: the usual inability for managerial types to admit they are WRONG. They consider every u-turn as loss of face. Difficult for good scientists to fathom (hallmark of bad scientist: not admitting you are wrong!), but true nonetheless.

Michael H.F. Wilkinson
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Pint

clouds more likely to be troublesome

over here in the Netherlands as well

bummer

We'll have the beer nonetheless

Michael H.F. Wilkinson
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Alert

WHY does the USPTO ....

award patents for inventions for which prior art so clearly exists. No formatting is lost when saving Open Office documents in XML? Wy not patent the concept of a generic markup language ((La)TeX anyone?)

In related news , the USPTO has allowed Microsoft to patent the screwdriver

Michael H.F. Wilkinson
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I want neither my head nor data in the cloud(s)

In a vain attempt to stem the tide of mutual OS/App-bashing, the following thought. Why cloud computing is a problem is more the issue than the underlying OS:

Regardless of who wrote the OS I use (Window XP, Debian, and OpenSuse (and still PalmOS (Garnet) on my old T3)), I want to have control over my data. Not just because I do not wish to lose (access to) them, but also because there is an inherent overhead in distributed computing due to communication overheads. Yes I can process my 1GB MRI scan on the XX teraflop machine in Amsterdam fast than on my 16 core opteron or xeon server at our institute, but GETTING the XXXX data there is so SLOW it outweighs the CPU time benefit tenfold.

And until they have a system to kick sysadmins remotely, I do so much more enjoy problems with on-site facilities than off-site ones

Let everybody use the OS they like, and the applications they like or can afford, just don't lose control of or access to your data!

Nah, back to bashing:

I do all my (science) writing in LaTeX (with emacs), so who needs {MS,Open,K}Office!

Michael H.F. Wilkinson
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Pint

A great scoop for Terry Pratchett's ...

Harry King! (a.k.a. King of the Golden River, a.k.a. Piss Harry)

Michael H.F. Wilkinson
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Reminds of panic caused by slime molds

These movements were clearly too fast for a slime mold, but slime molds can (occassionally) form large mobile clumps. One very wet summer in the States, one slightly smaller than a football climbed a telephone pole (slowly). Interesting footage

Michael H.F. Wilkinson
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@JC2 21:53 GM and Ford tend to sell DIFFERENT cars in Europe

The Mondeo was the FIRST Ford in YEARS to be aimed at the global market. So using the popularity of GM (mainly Opel) and Ford (true) are popular in Europe does not prove we stomach the American designs. The only way Chevrolet got a foot in the door in Europe is by rebranding Deawoo (mostly Opel copies at lower price (own one, cheap, works fine, plenty of space)).

At one time I rented a Chevrolet Corsica in the States, which gave LESS internal room, LESS storage space, and horrible handling for half the fuel economy of the Toyota Corolla I rented earlier on the same trip. It was more spacious, handled well, and in my experience Toyotas do not break down easily. Therefore, though more complex, I do not have to repair things myself, because (as my cousin in South Africa put it when talking about his 275000 km on the clock Toyota) it just never breaks down.

Size-wise: I am about 1.80m (5'11" approx), which might make me a bit of a shorty in the Netherlands, but I never felt cramped even in a Peugeot 106.

There may well be very good American cars, I just have not encountered one yet.

Michael H.F. Wilkinson
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Pint

I had no problems

It downloaded at amazing speed, no hitches in set-up, appears to be much faster

NICE

Michael H.F. Wilkinson
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Standards CAN be encumbered with patents

An ECMA or ISO standard can certainly be encumbered with patents, although there is a demand for fair and equal licencing terms (from Microsoft (??): track record, anyone )

Michael H.F. Wilkinson
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No SSD in The Netherlands either

What are they thinking at Dell?

Michael H.F. Wilkinson
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Pint

What? No Discworld Camels!!!

I think all windows machines should be named after Discworld camels. I have been known to call such machines "Bloody Stupid," "Evil Smelling Bugger," "Evil-Minded Son of a Bitch", "Evil Brother-in-law of a Jackal", and of course those perennial favourites: "You Bastard" and "You Vicious Brute". Some do need abbreviation: BS, ESB, EMSoaB, EBiloaJ, YB, and YVB. Nobody ever asks what it means.

Under linux the same machines are known as:

Gauss,

Leibnitz,

Cauchy

Riemann

etc: The earthly counterpart of Discworld camels

Michael H.F. Wilkinson
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RUBBISH: Linguini, swimming pools, Wales are better

They should skip the metric system entirely, and go for linguini, norris, brontosaurus and doubledecker buses: THAT'S rocket science

Michael H.F. Wilkinson
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License vs freedom

Leaving aside the issue whether the authorities are acting heavy-handedly in this particular case, I do not like to see anyone threatened, especially those performing a public duty. It IS important to allow jurors, judges, prosecutors, but also police officers, ambulance staff, etc., do their work without fear of abuse, threats, or worse.

Yes, these people do seem like complete morons, and it is the inalienable right of each and every human being to make a fool of themself in public, but if you are at the recieving end of such comments you might not think of it so lightly.

Of course you should have freedom to express your thoughts. Others have the right to call you to account IF you threaten people. Threatening jurors is no joke. These people should be made aware of this. I do not think a full-blown prosecution would be required, but I would not object to questioning them about their motives and intentions.

Maybe, just maybe, they will start thinking before posting

....... NAH, unlikely!

Michael H.F. Wilkinson
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Let me be the first

to welcome our rodent overlords

Michael H.F. Wilkinson
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Irony?

wuzn't dat de color of iron?

We need a knuckle-dragging icon!

Michael H.F. Wilkinson
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@Matthew Barker

Darl: "The ship isn't sink.k.k.k.nnnnnnngggggblblbblblblblblblblb........"

Michael H.F. Wilkinson
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Unhappy

One of the few sensible points made in this discussion bogged down by screen size

regards applications. My old Tungsten T3 is still going strong (after battery transplant), and has a host of third-party apps on it. I tested the later T5 and TX briefly, but their slower processors and memory were a pain, so I stuck with the old T3. None of the products offered by Palm (or any other) seemed interesting until the Pre came along. However, by making apps development exclusive this whole old ecosystem is lost, and I will therefore NOT move to a Pre.

Sorry Palm, no dice!

Michael H.F. Wilkinson
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African Antelopes?

not swallows?

(I am not suggesting coconuts migrate)

Michael H.F. Wilkinson
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Novelty (Super) Nova?

couldn't resist, sorry

Mine's the one with the Celestron C8 guider in the pocket

Michael H.F. Wilkinson
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Alien

That brings back memories!

Of course, I decided then and there to become an astronaut (ultimately studied astronomy, just three letters off)

We need a saturn 5 or LEM icon!!

Michael H.F. Wilkinson
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@Henry Wertz

More functionality does not mean more power. If AMD has shown one thing previously, it is that they CAN deliver more performance per watt (long denied by Intel to be important, or even relevant). If they say they can do it again, I will certainly not dismiss that out of hand.

Michael H.F. Wilkinson
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Looks like I wont be replacing my Vaio SZ2XP/C with this thing

Same weight, better performance, better battery life

Does come at a pretty stiff price

Michael H.F. Wilkinson
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@Andy ORourke

Should that not be:

Phuck oph Phorm?

Michael H.F. Wilkinson
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Looking at most user generated content

leads to the unavoidable conclusion that intelligent life is going extinct already.

Michael H.F. Wilkinson
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Black Helicopters

But why do members of congress complain?

they have nothing to fear: if they are innocent, they have nothing to hide!!

</sarcasm>

Michael H.F. Wilkinson
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Never blame on malice

what can also be put down to incompetence

(paraphrasing Napoleon, IIRC)

Michael H.F. Wilkinson
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And here I was thinking

that worshipping mysterious bearded figures was what the church was all about!

Michael H.F. Wilkinson
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Happy

GOT ME!!

Cheers!!

Michael H.F. Wilkinson
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Good they had a taser!

otherwise the complete idiot might have been shot!

Of course, she would be a Darwin award candidate then, but then you can't winn'em all, can you. Especially when you have clearly lost a significant percentage of your marbles.

I seriously have NEVER heard of a woman who "due to premenstrual stress" placed the importance of discount shoes over her children.

At least she blamed a satnav AND was using a mobile phone, so the IT angle is sorted out.

It raises a question too: Is AI needed to compensate for the abundance of natural stupidity?

Michael H.F. Wilkinson
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Reminds me of the joke about forbidding the "two piece bathing suit" (bikini)

A Dutch christian democrat MP (strict variety) proposed to forbid "two piece bathing suits for women (bikinis).

Response from liberal MP: Which part should be omitted?

Michael H.F. Wilkinson
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I am all for freedom of speech, but ...

I may be held to account for my what I say.

That is the idea of free speech: it must always be combined with responsibility and accountability. If you spout racial slurs at people, you can face legal action, if you divulge secrets, you might get jailed. ANY freedom is hollow if accountability is lacking. It is precisely the lack of accountability on the part of the goverment censors that Wikileaks is addressing.

Michael H.F. Wilkinson
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How long till we get

spam mail offering use of this technique to "gain several inches"?

Michael H.F. Wilkinson
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Surely the machine goes "Ping!"

Ig Nobel candidates, the first lot, certainly (combined medicine/economics)

Michael H.F. Wilkinson
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But can they grow....

Zaphod's extra head too?

Michael H.F. Wilkinson
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Boffin

Does anyone care about the CPU in HPC?

I don't. All my HP apps are in a higher-level language (C, C++, and even (shudder) Fortran (77, 90) (queue flames)) All I need is a good compiler. The same holds for all HPC apps I know. What is far more important than the CPU is the interconnect architecture. Designing for shared memory or different types of distributed systems requires different coding at the abstraction level of high level languages.

Depending on the speed of your interprocess communication bandwidth (rather than interprocessor, it is NOT the same on all systems) you can afford more or less communication in the algorithm. Load balancing and task distribution depend critically on how the CPUs are connected, much less on the kind of CPU. I have code that works quite happily on my dual core laptop, quad-core desktop, a quad-core opteron, a 16 CPU MIPS system, and (previously) on our old CRAY SV1e (RIP) with 32 processors, all essentially shared memory machines. It did not perform as well on the 4 x 4 core Xeon machine due to the memory-bandwidth limitations inherent in the design, but I would love to run it on a Nehalem. Run the same code on a cluster and it would CRAWL.

Michael H.F. Wilkinson
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its not just wanting to stick with MS-Office

(which I do not use (LaTeX is WAY easier for science writing)). I do not want MY data and docs stuck on some machine somewhere on the web where I do not have full control over it, NOR do I want my data on MY machine only accessible through a web app I may not be able to reach (try working for a week in Uganda, I did recently). No, I want MY data and docs on MY machine, accessible through apps on MY machine, AND good back ups.

Where cloud or grid or insert new catch phrase for distributed computing here computing is good for is massively parallel computing for LARGE scientific and business computing. It does not always pay to have your own iron if you do not use it often, better to rent time on a grid than have your own supercluster stand idle. A bit like not having your own web server, but renting space at a provider. That is a business model that does seem to work.

Michael H.F. Wilkinson
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I think my kkkkeyboard ssssshhhhortttttteedddd

from drooling over this device (the device, NOT the babe (honest(really!)))

Michael H.F. Wilkinson
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Does this mean

Flabby soldiers would not need to train anymore (is it sponsored by McDonalds, perhaps)

Michael H.F. Wilkinson
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It is all still a throwback to the power of the priesthood:

Control the most powerful human urge by making it semi-illegal (or only legal when in a priest-sanctioned form (marriage)) so you can channel the pent-up tension to get all the guys to wage war on the tribe next door who worship the wrong god/goddess/great green argleseizure (and rape any surviving women in the process, THAT'S OK).

Now some form of sexual restraint is a good idea, or else we would never get any work done ;-), but glorifying violence is less so.

Michael H.F. Wilkinson
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I am surprised

nobody mentioned the Flying Spaghetti Monster yet.

or the Great Green Arglezeizure for that matter

I like to try the following on those Christians who take the bible literally:

Me: so you believe in the literal truth of the bible?

C: Yeah sure!, It's the word of GOD.

Me: Good, do you eat pork, you like bacon and eggs?

C: Certainly

Me: THEN YOU ARE UNCLEAN!!!

C: How come?

Me: says so in Leviticus 11:6. QED!!!

This seriously annoys them

Michael H.F. Wilkinson
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Boffin

I wonder what you would be saying

if they wanted to spend billions on studying NOTHING. Vacuum is very interesting if you know how to look at it closely. I would back such schemes, but then I never had much truck with beancounter attitudes.

Anyway, it beats spending money on Euro/Joint Strike/Insert favourite here/ fighters or aircraft carriers that do not seem to be fit for the wars we fight now (that should get people going).

Michael H.F. Wilkinson
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Would the BOFH like one?

To bash users/beancounters around the ears

Michael H.F. Wilkinson
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IT Angle

Maybe by self-competition

they want to avoid being seen as a monopoly?

Or they want to have as many versions of W-7 as there are linux distros? In this way, windows users can experience the same futile arguments as so often heard between openSUSE, Fedora, Debian, Ubuntu and other fanboys

(I have debian at work and openSUSE at home so I can take two sides in those debates ;-) )

Michael H.F. Wilkinson
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Alien

GRIN!!

Aliens because, well.....

Michael H.F. Wilkinson
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@simon @AC silly me but

@simon

No flame, just a little fact: I have NEVER needed to run anything other than YAST or YUM on the 3 openSUSE machines I administer. I have had HORRENDOUS problems installing Windows (NT/2000/XP) on the same machines that work out of the box with OpenSUSE (9,x, 10.0,10.2, 10.3 and 11.1). My wife used a linux account on our home machine when windows was up the creek again (Symantecs fault this time for not having proper uninstall). She had no problems, except when connecting to her work webmail site, which (being an MS-shop) had all sorts of javascript errors. Installing IE under wine solved that. Defaulting Openoffice to write Word format solved the remainder.

@AC silly me but

Ever tried installing windows on a machine from scratch? Windows 2000 refused to boot at some stage, not because I had installed my Adaptec 2940UW SCSI controller (that worked fine), but when I had the gall to attach an obscure device called a Quantum Viking II 9GB hard drive to it (the hard drive from my old PC, with a Windows 3.1 image on it, so 2000 might have been offended). I checked whether there was a boot order problem, there wasn't. Linux booted fine, but W2000 borked. This was a real shame as 9GB of storage was not to be sneezed at then (main disk was 20 GB). XP is a lot better in this respect, but I still get angry at the way it insists on stuffing up the boot loader EVERY time.