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Probleemoplossen & OntwerpenICT-werktuigen

Les 2

Erik DuvalDept. Computerwetenschappen

http://www.cs.kuleuven.ac.be/~erikd/

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H 26/9 inleiding, toledo, maple

Z 27/9 internet en wwww

H 3/10 systemen, gebruikers, web, virussen

Z 10/10 tekstverwerking en rekenblad

Z 17/10 samenwerking

H+Z 24/10 presentaties en rapportering, maple

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week les zelfst oef12345678

woe x

woe ma-vr

x ma-vr

x ma-vr

woe pten!

x

ma-vr

pten!

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Componenten van computersysteem

CPU

RAM

Besturings-

systeem Gebruiker

HardwareApplicaties

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voorbeelden?

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Hardware

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voorbeelden?

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Belangrijkste wet uit computerwetenschappen?

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Moore’s law

• ‘the number of transistors that can be placed inexpensively on an integrated circuit has doubled approximately every two years’ (1965)

• ook

• processing speed

• memory capacity

• sensors

• network capacity

• ... 8

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what does “exponential” mean?

if you fold a sheet of paper 50 times,then how thick is the result?

about the distance to the sun...

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wiring the ENIAC with a new program

ENIAC1946Mauchly and Eckert

stats:3,000 cubic feet30 tons18,000 vacuum tubes70,000 resistors170 kilowatt power req.~1 kilobit memory

approximate processing power of today’s singing birthday card

but not a stored-program device

Great description here: www.computinghistorymuseum.org/teaching/lectures/pptlectures/7b-eniac.ppt

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preparing punch cards

An important by-product: confetti. All the chaff from all those cards was just great to throw around the dorm.

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preparing punch cards

Each key press punches holes, so there’s no “erase.” Fixing a mistake almost always required ejecting the card and starting it over.

In a pinch – say you really needed to fix a card and the punch was down – a clever operator might know enough about the card encoding to close some holes with tape and open others with a knife.

So on the one hand, we were adapting to the machines. On the other hand, the workings of the machines were exposed, right out where we could get to them.

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punch cards

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http://en.wikipedia.org/wiki/File:FortranCardPROJ039.agr.jpg

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operator console

IBM System 3601960’s

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next?

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Command Line Interface

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Nog vb?

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Grafische gebruikersinterface

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D. Engelbart, Augment

• Stanford Research Institute

• “Uitvinder” van muis, windows, groupware, ...

• team naar Xerox PARC

• nu: bootstrap institute

• http://www.bootstrap.org/

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XEROX PARC Star (1981)

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All 39 pages of advertising that Apple bought in a 1984 issue of newsweek are available here: http://www.aci.com.pl/mwichary/computerhistory/ads/macnewsweek

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Windows 1.0 (1985)

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next?

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32 http://emotiv.com/

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“veiligheid”

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sociale media?

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hash tag

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history

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versnippering

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scale

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> 4.000.000/day> 6.000.000.000 total

facebook> 200.000.000/day

>100.000.000.000 total

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download> 4.000.000.000 videos/day

upload48 hours video/min

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who?

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web:computing documents

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social media:computing communication

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Fear

Uncertainty

Doubt

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gewoon: proberen!

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Questions?

http://erikduval.wordpress.com/twitter: @ErikDuval