Probleemoplossen & OntwerpenICT-werktuigen

Les 2

Erik DuvalDept. Computerwetenschappen

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

http://www.slideshare.net/erik.duval

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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

week les zelfst oef12345678

woe x

woe ma-vr

x ma-vr

x ma-vr

woe pten!

x

ma-vr

pten!

Componenten van computersysteem

CPU

RAM

Besturings-

systeem Gebruiker

HardwareApplicaties

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voorbeelden?

Hardware

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voorbeelden?

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

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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http://www.smartplanet.com/technology/blog/thinking-tech/physics-nobel-winners-launched-moores-law-of-optics/1689/

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

preparing punch cards

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

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.

punch cards

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

operator console

IBM System 3601960’s

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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21http://www.youtube.com/watch?v=JfIgzSoTMOs

http://cfdj.sys-con.com/read/536976.htm

XEROX PARC Star (1981)

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24 http://www.youtube.com/watch?v=G0FtgZNOD44

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

Windows 1.0 (1985)

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next?

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https://www.youtube.com/watch?v=9c6W4CCU9M4

http://blogs.msdn.com/tom/archive/2009/03/03/future-vision-ux-ideas.aspx

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http://www.youtube.com/watch?v=6Cf7IL_eZ38

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http://www.youtube.com/watch?v=CGwvZWyLiBU

32 http://emotiv.com/

33 http://www.youtube.com/watch?v=qCSSBEXBCbY&NR=1

“veiligheid”

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https://admin.kuleuven.be/icts/info/pc-beveiliging/virus.html

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https://admin.kuleuven.be/icts/info/pc-beveiliging/

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http

://w

ww

.wir

ed.c

om/d

ange

rroo

m/2

011/

10/v

irus

-hits

-dro

ne-fl

eet/

sociale media?

hash tag

history

versnippering

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scale

http://www.insidefacebook.com/2012/07/26/breakdown-of-facebook-user-growth-by-quarter-and-geography/

http://www.insidefacebook.com/2012/07/26/breakdown-of-facebook-user-growth-by-quarter-and-geography/

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http://gizmodo.com/5813875/what-happens-in-60-seconds-on-the-internet

> 4.000.000/day> 6.000.000.000 total

facebook> 200.000.000/day

>100.000.000.000 total

download> 4.000.000.000 videos/day

upload48 hours video/min

who?

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web:computing documents

http://en.wikipedia.org/wiki/File:PageRank-hi-res.png

social media:computing communication

http://www.myketech.com/tag/facebook-algorithm-update/

http://www.facebookstories.com/stories/1574/interactive-mapping-the-world-s-friendships#color=language-official&story=1&country=BE

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http://www.youtube.com/watch?v=F7pYHN9iC9I

Fear

Uncertainty

Doubt

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gewoon: proberen!

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Questions?

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