peno1: les 2
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TRANSCRIPT
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Probleemoplossen & OntwerpenICT-werktuigen
Les 2
Erik DuvalDept. Computerwetenschappen
http://www.cs.kuleuven.ac.be/~erikd/
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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
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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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http://www.smartplanet.com/technology/blog/thinking-tech/physics-nobel-winners-launched-moores-law-of-optics/1689/
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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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21http://www.youtube.com/watch?v=JfIgzSoTMOs
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http://cfdj.sys-con.com/read/536976.htm
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XEROX PARC Star (1981)
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24 http://www.youtube.com/watch?v=G0FtgZNOD44
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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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https://www.youtube.com/watch?v=9c6W4CCU9M4
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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
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33 http://www.youtube.com/watch?v=qCSSBEXBCbY&NR=1
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“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/
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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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http://www.insidefacebook.com/2012/07/26/breakdown-of-facebook-user-growth-by-quarter-and-geography/
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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
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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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http://en.wikipedia.org/wiki/File:PageRank-hi-res.png
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social media:computing communication
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http://www.myketech.com/tag/facebook-algorithm-update/
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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
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Fear
Uncertainty
Doubt
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gewoon: proberen!
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Questions?
http://erikduval.wordpress.com/twitter: @ErikDuval