Sabin Buraga: Participând la Web
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Transcript of Sabin Buraga: Participând la Web
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Dr.
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www.purl.org/net/busaco
participând la…Web
Dr. Sabin Buraga
o prezentare pentru studenții la jurnalism
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Dr.
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www.purl.org/net/busaco
“De la un anumit punct încolo,nu mai există cale de întoarcere.
Acela este punctul ce trebuie atins.”
Franz Kafka
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Dr.
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preambul: ce este Web-ul?
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Dr.
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Web
WWW – World Wide Web
“pânza de păianjen mondială”
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Serviciu Internet
WWW Internet
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Dr.
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mediu de comunicare între oameni
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Dr.
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…și între calculatoare
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Dr.
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Idee (Sir Tim Berners-Lee la CERN – 1989)
accesarea sistemelor informaționale disparate,indiferent de natura surselor de date
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Dr.
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Idee (Sir Tim Berners-Lee la CERN – 1989)
accesarea sistemelor informaționale disparate,indiferent de natura surselor de date
anything can link to anything
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Bazat pe modelul client/server
serverWeb
client Web
(browser)
cerere
răspuns
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Dr.
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…și pe hipertext
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Dr.
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Scopuri principale:
independența de dispozitivindependența de software
scalabilitateamultimedia
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Dr.
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Scopuri principale:
independența de dispozitivindependența de software
scalabilitateamultimedia
caracter deschisopen standards
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Funcționează conform reglementărilorConsorțiului Web
MIT, ERCIM, Keio UniversityAdobe, HP, IBM, Microsoft, Oracle,…
www.w3.org
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Dr.
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www.purl.org/net/busaco
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Resursele sunt identificate prin adresa lor
identificator uniform de resurseURI – Uniform Resource Identifier
http://slideshare.net/busaco/presentations
arhitectura Web-ului
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arhitectura Web-ului
Accesul la conținutul – reprezentarea –resurselor Web
se realizează printr-un protocol
HTTP – HyperText Transfer Protocol
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resursele – documentele – includ <marcaje />
pagini Web
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arhitectura Web-ului
marcajele conțin la rândul lor URI-urihipertext
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Web-ul clasic: 1.0
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Caracterizare
Sit Web
sistem pe care rulează un server Webgăzduind o serie de pagini (resurse) înrudite
ale unei organizaţii, companii sau persoane
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Caracterizare
Aplicaţie Web
colecţie interconectată de pagini Webcu conţinut generat dinamic, menită a oferi
utilizatorilor o funcţionalitate specifică
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Caracterizare
Aplicaţie Web
interacţiunea dintre aplicaţie şi utilizatoriare loc via o interfaţă Web
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Caracterizare
Aplicaţie Web
interacţiunea dintre aplicaţie şi utilizatoriare loc via o interfaţă Web
uzual, sit Web = aplicaţie Web
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Caracterizare
Aplicaţie Web
exemple:Amazon, Expedia, Flickr, GMail, Joobs.ro, Knol, PHPMyAdmin,
Quora, SlideShare, Twitter, Vimeo, webmin, WordPress etc.
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Caracterizare
Arhitectura unei aplicaţii Web
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Aplicaţie Web = Interfaţă + Conţinut (Date) + Program
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mitul 1: cea mai importantă este interfața
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Aplicaţie Web = Interfaţă + Conţinut (Date) + Program
mitul 1: cea mai importantă este interfaţamitul 2: cel mai important este programulmitul 3: cele mai importante sunt datele
HTML, CSS, Ajax, Flash, Silverlight, SVG, widget-uri,…
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mitul 2: cel mai important este programul
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Aplicaţie Web = Interfaţă + Conţinut (Date) + Program
mitul 1: cea mai importantă este interfaţamitul 2: cel mai important este programulmitul 3: cele mai importante sunt datele
server: C#, Java, Perl, PHP, Ruby etc.; client: JavaScript
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mitul 3: cele mai importante sunt datele
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Dr.
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Aplicaţie Web = Interfaţă + Conţinut (Date) + Program
mitul 1: cea mai importantă este interfaţamitul 2: cel mai important este programulmitul 3: cele mai importante sunt datele
relaționale (SQL), XML, grafuri, modelare semantică (RDF)
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Aplicaţie Web = Interfaţă + Conţinut (Date) + Program
mitul 1: cea mai importantă este interfaţamitul 2: cel mai important este programulmitul 3: cele mai importante sunt datele
fapt: sunt importante toate!
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Web-ul social
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Dr.
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than a technical one.The ultimate goal of the Web is to support andimprove our Web-like existence in the world.
We clump into families, associations, and companies.We develop trust across miles and
distrust around a corner.”
Tim Berners-Lee, Weaving the Web, 1999
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Web-ul prezent
WWW platforma în care utilizatorulîşi controlează propriile date
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Web-ul prezent
WWW platforma în care utilizatorulîşi controlează propriile date
aşa-numitul Web 2.0, conform Tim O’Reilly, 2005
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„…openness of data and services,rich user experience and low cost of delivery.”
Jeff Clavier
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Web-ul social: Caracteristici
Participare, nu doar publicare a datelorread/write Web
colaborare, comunităţi,conectivitate inter-personală și între aplicaţii
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platforme de (micro)blogging
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agregatoare de știri
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sisteme de recomandare bazate pe locație
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Web-ul social: Caracteristici
Participare, nu doar publicare a datelorread/write Web
social network în stilul peer-to-peer (P2P)
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Web-ul social: Caracteristici
Participare, nu doar publicare a datelor
generația I – relații (in)directe între persoane
LinkedIn (afaceri), Friendster, Hi5 (relații sociale),…
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Web-ul social: Caracteristici
Participare, nu doar publicare a datelor
generația II – partajarea unui “obiect” social
BookMooch (cărți vechi), Flickr (foto), H20 (idei),PatientsLikeMe (afecțiuni), Reddit (știri),…
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Web-ul social: Caracteristici
Participare, nu doar publicare a datelor
generația III – crearea unui univers digital personal,prin mixarea resurselor/serviciilor (mash-ups)
Facebook, Twitter etc.
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Web-ul social: Caracteristici
Partajare de artefacte informaționale
documente, fotografii, multimedia, cod-sursă etc.
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Web-ul social: Caracteristici
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Web-ul social: Caracteristici
Partajare de artefacte informaționale
documente, fotografii, multimedia, cod-sursă etc.
e.g., sisteme de management de conținut on-lineBubbl.us, Flickr, Gliffy, GoodReads, Scribd, SlideShare, Revyu,…
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Web-ul social: Caracteristici
Adnotări (tag-uri) definite de utilizator
clasificări ad-hoc realizate de oamenipartajate în cadrul unei comunități
adnotarea (tagging) conținutului
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Web-ul social: Caracteristici
Adnotări (tag-uri) definite de utilizator
tag = (meta)dată simplă – termen arbitrar ales –
asociată extern unui obiect (unei resurse)
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Web-ul social: Caracteristici
Adnotări (tag-uri) definite de utilizator
tag = (meta)dată simplă – termen arbitrar ales –
asociată extern unui obiect (unei resurse)
cu scopul de a identifica, sorta, agrega etc. acea resursă
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tagging
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Web-ul social: Caracteristici
Adnotări (tag-uri) definite de utilizator
au loc într-un sistem social facilitând tagging-ul
exemplu: social bookmarking
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experiment
accesarea resurselorWeb marcate
cu anumite tag-uri
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Web-ul social: Caracteristici
Adnotări (tag-uri) definite de utilizator
folksonomy = folk + taxonomy
“…is the result of personal free tagging of pagesand objects for one’s own retrieval”
Thomas Vander Wal
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www.purl.org/net/busaco
Web-ul social: Caracteristici
wordle.net – vizualizarea tag-urilor folosite de busaco în delicious
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Utilizări ale tagging-ului:social bookmarking: del.icio.us, FavWiki, Ma.gnolia
multimedia: Flickr, Dabble, Last.fm, Viddlerștiri: Digg, newsvine
e-business: Amazon, Lululocalizare geografică (geotagging): Panoramio, Platial
muzee: Steve.museum, Powerhouseștiință: CiteULike, myExperiment
în Intranet: IBM Dogear, Scuttle, ConnectBeamla nivel de sistem de operare (fișiere): Mac OS X, Vista/7
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Evoluția unui sistem de tagging
#1: Make System Personally Useful
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Evoluția unui sistem de tagging
#1: Make System Personally Useful
sistemul trebuie să fie util
pentru fiecare utilizator în parte (oamenii sunt egoiști)
comunicarea clară a beneficiilor tagging-ului
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Evoluția unui sistem de tagging
#2: Identify Symbiotic Relationshipbetween Personal & Social
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Evoluția unui sistem de tagging
#2: Identify Symbiotic Relationshipbetween Personal & Social
Personal snippetsSocial stream
exemple:PicturesEvents, MusicPlaylists
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Evoluția unui sistem de tagging
#3: Make Porous Boundarybetween Public & Private
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Evoluția unui sistem de tagging
#3: Make Porous Boundarybetween Public & Private
utilizatorul decide politica privind drepturile de autor și/sau caracterul privat al resurselor (privacy)
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Evoluția unui sistem de tagging
#4: Provide Outlet for Self-expression
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Evoluția unui sistem de tagging
#4: Provide Outlet for Self-expression
suport pentru exprimări artistice sau umor
acces la resurse via URL-uri simple și memorabile
suport pentru jocuri sociale: aprecieri, concursuri,…
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Web-ul social: Caracteristici
Inteligenţa colectivă
editare și management colaborativ al conţinutului
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Inteligenţa colectivă
editare și management colaborativ al conţinutului
aplicaţii de tip wiki – Media Wiki, XWiki etc.
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www.purl.org/net/busaco
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Servicii și nu pachete software
aplicaţiile masive („mamut”) sunt substituitede cele constituite din servicii specifice,
disponibile pe Web, uşor de înlocuit
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Servicii și nu pachete software
SaaS – Software as a Service
suite de birouGoogle Docs, 280Slides, Prezi,Adobe Creative SuiteAviary
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Web-ul social: Caracteristici
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Web-ul social: Caracteristici
Software rulat oriunde
ubicuitatea aplicaţiilor Web
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Software rulat oriunde
bookmark-uri salvate local(pentru fiecare browser și calculator folosit)
versusbookmark-uri disponibile pe Web,
uşor de accesat şi de partajat cu alţii,independent de platformă
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Mediatizare (syndication) Web
date privitoare la un sit Web sunt expuse libervia un flux (feed) de știri
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Mediatizare (syndication) Web
date privitoare la un sit Web sunt expuse libervia un flux (feed) de știri
format RSS (Really Simple Syndication) sau Atom
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Web-ul social: Caracteristici
Mediatizare (syndication) Web
un feed este disponibil via un URL (fixat),eventual doar în contextul unui intranet/extranet,
pentru a fi preluat și procesat de un program
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Mediatizare (syndication) Web
accesul la fluxuri RSS/Atom
navigator Web – Firefox, Safari – sau extensie: Feedlycititor de știri – FeedDemon, Google Reader,…
agregator Web – FeedBurner, Feedster, Technorati
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Web-ul social: Caracteristiciacces la fluxuri RSS/Atomvia Google Reader
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Web-ul social: Caracteristici
Podcasting = pod (iPod) + broadcast
flux audio/video automat expediat utilizatorului pentru a fi redat de un player multimedia
– e.g., iTunes – accesibil oricând via un podcast feed
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Podcasting = pod (iPod) + broadcast
flux audio/video automat expediat utilizatorului pentru a fi redat de un player multimedia
– e.g., iTunes – accesibil oricând via un podcast feed
inițiativa iTunesU
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Interacțiune bogată cu utilizatorulRIA – Rich Internet Applications
aplicarea modalităților de interacțiune tradițională(la nivel de desktop) în contextul aplicațiilor Web
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Web-ul social: Caracteristici
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Interacțiune bogată cu utilizatorulRIA – Rich Internet Applications
platforme (de dezvoltare) Webpentru utilizatorii obişnuiți
Drupal, Facebook, Joomla, WordPress etc.
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Interacțiune bogată cu utilizatorulRIA – Rich Internet Applications
widget-uri (mini-aplicaţii specifice) la nivel de:sistem de operare, Web, dispozitive mobile
KDE, Windows 7, iGoogle, iPhone/iPod,…
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Interacțiune bogată cu utilizatorulRIA – Rich Internet Applications
noi paradigme de interacțiunee.g., realitatea virtuală/îmbogățită
(virtual/augmented reality)
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Sabin Buraga < [email protected] >
social augmented realityconcept creat de Matthew Buckland:
www.matthewbuckland.com/?p=1041
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Aplicaţii Web hibride: mash-ups
combinarea conţinutului ce provinedin surse (situri) multiple,
oferind o funcţionalitate/experienţă nouă
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www.purl.org/net/busaco
Web-ul social: Caracteristici
Aplicaţii Web hibride: mash-ups
combinarea conţinutului ce provinedin surse (situri) multiple,
oferind o funcţionalitate/experienţă nouă
utilizează fluxuri RSS/Atom, servicii Web, API-uri,…
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aplicație Web hibridă (mash-up)folosind tagging-ul de resurse
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Web-ul social: Caracteristici
Valori de bază
deschidere, transparenţă, respect
iniţiativa Creative Commonsreasonable, flexible copyright
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Web-ul social: Caracteristici
http://creativecommons.org/about/licenses/
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Web-ul social: Caracteristici
căutarea resurselor multimedia ce pot fi folositeconform licențelor Creative Commons
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Există mai multe categorii de aplicații Web?
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Categorii de aplicații WebCentrate pe documenteInteractiveTranzacționaleColaborativeOrientate spre portaluriDe tip ubicuuWeb socialWeb semantic
evoluția în timpa complexității
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Centrate pe documente – document centric
conținut/pagini static(e): situri de companii, personale
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Interactive
expoziții virtualesituri de știri
sisteme de facilitare a călătoriilor…
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www.purl.org/net/busaco
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Tranzacționale
online bankingsoluții B2B (business-to-business)
fluxuri de activități (workflow-uri)
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Colaborative
tele-conferințe Webwiki-uri
servicii e-learningaplicații Web peer-to-peer
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Orientate spre portaluri
localizare unitară a informațiilortehnice, de afaceri, guvernamentale,…
specie: Web-ul cetățenesc
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www.purl.org/net/busaco
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De tip ubicuu
servicii mobile bazate pe locația utilizatorului, disponibile pe mai multe plaforme:
desktop, dispozitive mobile, tablet,…
Web-ul mobil
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Web social
mediatizare (syndication)spații de lucru virtuale
filtrare colaborativădivertisment social
social (game) computing
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Web semantic
modelarea cunoștințelorpentru a fi “înțelese” de calculatoare
dateinformațiicunoștințe
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www.purl.org/net/busaco
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Web semantic
interconectarea datelor având descrieri procesabilela nivelul calculatoarelor
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Web semantic
interconectarea datelor având descrieri procesabilela nivelul calculatoarelor
linked open data
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Web semantic
interconectarea datelor având descrieri procesabilela nivelul calculatoarelor
linked open data
open education, open government,open journalism, open science,…
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www.purl.org/net/busaco
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starea curentă este oferită de http://lod-cloud.net/
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Web semantic
management de cunoștințemediatizare complexă
realizare automată de raționamenterecomandare “inteligentă” de resurse
regăsirea și reutilizarea dateloretc.
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It’s not the wires – it’s the computers
It’s not the computers – it’s the documents
It’s not the documents – it’s the things
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www.purl.org/net/busaco
“The last level of abstraction isthe Web of real things,
built on top of the Web of documents, which is in turn built on the network of computers.”
Tim Berners-Lee, 2008
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Dr.
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www.purl.org/net/busaco
participând la Web
Dr. Sabin Buraga – Facultatea de Informatică, UAICwww.purl.org/net/busaco