curs 4 2012/2013rf-opto.etc.tuiasi.ro/docs/files/tw_4_2012.pdf · 2013-01-13 · nr nume grupa...
TRANSCRIPT
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Curs 42012/2013
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Capacitate de informare =
Nota Tema
curs 6, prezenta obligatorie, 25% din nota
-
Test 1 referinţă
C2
Test 2 verificare
C6
Interesare subiect ?Nota
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Nr Nume Grupa Subiect Rezultat % [38]
1 BEJENARI DACIAN 5101 2 12 32
2 BOICU PAUL 5101 1 17 45
3 LUNGU NARCIS IUSTIN 5101 37 13 34
4 PINZARIU MARINA 5101 4 20 53
5 SERBAN IULIAN MIHAI 5101 13 19 50
6 SEVERIN IONUT 5101 3 16 42
7 TEACU ALEXANDRU 5101 12 17 45
8 CIOBANU CEZAR ADRIAN 5102 28 13 34
9 MIHALIUC SERGIU 5102 32 15 39
10 NITA CATALIN 5102 25 16 42
11 PANAITE STEFAN 5102 38 16 42
12 PRICOP PAUL 5102 26 9 24
13 VALEANU IOANA 5102 27 10 26
14 BURAGA ALEXANDRU 5103 31 10 26
15 CARCALETE ADRIAN 5103 35 7 18
16 CIOBANU STEFAN 5103 21 11 29
17 COZMANIUC ALEX 5103 36 9 24
18 DIACONITA TIBERIU CONSTANTIN 5103 17 6 16
19 DOBREA ANDREEA DANIELA 5103 20 20 53
20 FEDELES LAURA 5103 15 16 42
21 ICHIM NICOLETA ANDREEA 5103 34 17 45
22 IGNEA MIHAI 5103 29 8 21
23 TODEREANU ALEXANDRU IOAN 5103 30 20 53
Valoare medie
13.9 36.5
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Nr Nume Grupa Subiect Rezultat % [38]
24 BARON BOGDAN IONUT 5104 40 20 53
25 PETRESCU EMMANUEL 5104 41 17 45
26 TANASE CATALINA 5104 39 14 37
27 CHIRIBAU RADU 5105 19 16 42
28 LUCA GEORGE STELIAN 5105 22 19 50
29 PALADE CRISTIAN 5105 23 18 47
30 PARASCA PAUL MARCEL 5105 14 11 29
31 TURCU DANIEL 5105 9 11 29
32 UNGUREANU ELENA 5105 16 10 26
33 BULGARESCU COSTANTIN 5106 18 11 29
34 CONDREA DORIAN 5106 24 10 26
35 DUTCOVICI ALEX 5106 10 18 47
36 FILIPIUC DAN 5106 5 10 26
37 GULIMAN COSMIN 5106 33 17 45
38 MOLDOVAN IOAN CRISTIAN 5106 11 11 29
39 RADION ALEXANDRU 5106 7 12 32
40 SIMION DUMITRU 5106 6 9 24
41 TAMAS CLAUDIU 5106 8 18 47
Valoare medie
13.9 36.5
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http://rf-opto.etti.tuiasi.ro Pagina in limba romana ≠ Pagina in limba engleza
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Intel® Itanium® processors (codenamed Tukwila)
2 miliarde tranzistoarepe CPU
>3 miliarde operatii pesecunda
Nivel redus de complexitate al operatiilor elementare
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Un programator n-a venit la servici de trei zile.
Colegii de servici au venit la el acasă şi-l găsesc pe acesta chel, dormind în cadă, ţinând în mâini un şampon.
Au luat şamponul şi s-au apucat să citească instrucţiunile de folosire: Clătiţi părul cu apă.
Aplicaţi şamponul
Frecaţi
Aşteptaţi două minute
Clătiţi părul cu apă
Repetaţi procedura.
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Motoare de cautare 2009 (International)
▪ Google (89.8%)
▪ Yahoo (5.15%)
▪ Bing (3.27%)
2011 (International)▪ Google (91.1%)
▪ Bing (3.63%)
▪ Yahoo (3.56%)
2012▪ similar
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SEO
Search Engine Optimization
RobotiBaza de
dateServerClient
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AND SI logic Cuv_1 AND Cuv_2 + Cuv_1 +Cuv_2
OR SAU logic Cuv_1 OR Cuv_2
NOT NEGARE logica Cuv_1 AND NOT Cuv_2 + Cuv_1 -Cuv_2
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NEAR
apropiere in pagina
Cuv_1 NEAR Cuv_2
Fraza
“Cuv_1 Cuv_2 …. Cuv_n”
Operator implicit AND
Cuv_1 Cuv_2 = Cuv_1 AND Cuv_2
Cautare avansata
Interfata web pentru introducerea acestor parametri
Se pot introduce si alte optiuni
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Folositi termeni/expresii univoci film thin film technology
Incercati sa gasiti un termen care sa fie propriunumai informatiei cautate
Do not feel lucky!!! (lucky = lazy) Nu cautati in limba romana utilizati limba engleza sau chineza
E mai importanta identificareaunui site utilizabil decat a informatiei punctuale cautate
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Estimati identitatea reala a celui care posteaza Estimati competenta celui care posteaza Estimati credibilitatea celui care posteaza Verificati informatia dobandita
Cross-check
Gasiti informatie cu acelasi sens la alte surseidentificabile, credibile, competente
Dupa identificarea unei surse valide, cautati in acel loc si alte informatii valide din domeniul de interes
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Evaluarea cat mai corecta a identitatii reale a furnizorului de informatie Oricine poate posta public orice informatie Oricine isi poate aroga orice identitate
▪ In anumite locuri (? free) Posibilitati de verificare Nume de domeniu
▪ ETTI Iasi -> etti.tuiasi.ro
Adrese de email▪ …[email protected]
Verificarea apartenentei prin accesarea domeniului“parinte”▪ www.etti.tuiasi.ro -> www.tuiasi.ro
▪ kovlerdaily.wordpress.com/ -> www.wordpress.com (? free)
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Estimarea cat mai corecta a competenteifurnizorului de informatii
Centru de cercetare in diabet in tari dezvoltate
Spital universitar in tari dezvoltate
Spital public
Spital/cabinet medical privat
Organizatie non medicala
Public/Forum
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Detectarea “conflictului de interese” in cazulfurnizorului de informatii
Firme care activeaza in domeniu (~)
▪ Informatii despre insulina mai credibile la o firma care produce aparatura pentru injectii
▪ Informatii despre aparatura pentru injectii mai credibile la o firma care produce insulina
Informatii mai credibile la o firma mare in domeniu
▪ “numele” cantareste mai mult decat eventuala publicitate
Prezenta reclamelor generale (Google adSense) pesite (?)
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Madonna – Like a prayer (versuri)
Madonna – 91.500.000
Madonna Prayer – 2.880.000
+Madonna +Prayer – 2.580.000
+Madonna +Prayer –religion – 98.500
+Madonna +”Like a prayer” – 818.000
+Madonna +”Like a prayer” +lyrics – 144.000
▪ Toate din primele 10 rezultate contin informatia cautata
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Diabet, semne de cetoacidoza
diabet (RO) – 6.530.000 (0.24s)
diabetes (ENG) – 277.000.000 (0.14s)
http://translate.google.com
▪ Rezultate bune pentru cuvinte
▪ cetoacidoza -> ketoacidosis
Diabetes AND ketoacidosis
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Diabet, semne de cetoacidoza
diabetic OR ketoacidosis OR signs – 653.000.000
Diabetes AND ketoacidosis
▪ diabetes ketoacidosis – 8.380.000 (0.19s)
▪ diabetic ketoacidosis – 1.340.000 (0.1s)
▪ diabetic ketoacidosis signs – 10.900.000
▪ +diabetic +ketoacidosis +signs – 10.900.000
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Diabet, semne de cetoacidoza
"diabetic ketoacidosis signs" – 17.400
"diabetic ketoacidosis signs and symptoms" –7.060
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Rezultatesponsorizate De obicei ofera mai
putine informatii utile
d.p.d.v. psihologic, evitate de utilizatori(conflict de interese)
Recunoscute prin faptul ca: URL-ul contine numai numele de domeniu “www.site.com” (fara
“/fisier.htm”) Sub rezultat exista un slogan comercial, nu un citat din pagina
respectiva
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Diabet, semne de cetoacidoza
"diabetic ketoacidosis signs and symptoms“ –7.060
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metoda asincrona de comunicare metoda de a scrie, trimite, receptiona si salva
mesaje prin sisteme de comunicatiielectronice
“store and forward” – statia intermediarastocheaza mesajul si il trimite destinataruluila cerere
metoda preferata de comunicare in relatiiprofesionale
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1971 – primul email trimis (ARPANET) 1973 – email = 75% din traficul ARPANET 1996 – 300 milioane mesaje/zi 2001 – 9.8 miliarde mesaje/zi 2008 210 miliarde mesaje/zi
1.3 miliarde utilizatori 2011 3.1 miliarde conturi
71% din traficul email – spam
300 miliarde mesaje/zi
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corespunde existentei unui cont (username) pe un calculator (mailserver) care oferaservicii de email.
Forma: username@mailserver @ = “at” (la) nu se accepta spatii si virgula mailserver: nume de (sub)domeniu sau IP conturile de cele mai multe ori au limitari in
dimensiune totala a datelor
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Header TO – adresa destinatar si numele destinatarului Subject – un scurt text descriptiv al mesajului (deosebit de
important) CC – Carbon Copy BCC – Blind Carbon Copy Data
Body Text HTML Atasamente: Attachments
Semnatura – 4÷9 linii de text (HTML posibil) Limita a dimensiunii totale: ~10-25MB MIME: Multipurpose Internet Mail Extensions – ineficient
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Protocoale POP3 – Post Office Protocol IMAP – Internet Messages Access Protocol
▪ webmail
SMTP – Simple Mail Transfer Protocol Spam mesaje comerciale nesolicitate se estimeaza in prezent ca reprezinta 70-75% din
totalitatea mesajelor probleme economice majore
▪ stocare▪ filtrare▪ pierderea unor mesaje valide
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Virusi ca atasamente a email-urilor email worms: se automultiplica prin intermediul email-ului Toate sistemele antivirus moderne au capacitatea de a
verifica un mesaj email inainte de a fi deschis Securitate mesajele sunt in general necriptate mesajele trec prin mai multe gateway in drumul spre
destinatar, pot fi interceptate Multi ISP pastreaza o copie locala a mesajelor inainte de a
livra, de multe ori raman in “cache” SSL – Secure Sockets Layer SASL – Simple Authentication and Security Layer
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IMAP serverSSL (securitate)
POP3 serverLeave messages on server
IdentitateSemnatura
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Get Mail (check mail, get messages) Write (compose, new) Reply Forward
inline
as attachment
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metoda sincrona de comunicare unele necesita un server care sa intermedieze
comunicatiile client – server – client
client – client IM – 1/1, paragraf Yahoo
Microsoft
AOL Chat – 1/x, paragraf Talk – 1/1, caracter
ServerClient 1
Client 2Client n
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Yahoo Messenger http://messenger.yahoo.com emoticons = :), = :(, ;-) hidden emoticons: @};- , [-O< , ^:)^
abrevieri AFAIK – as far as I know BRB – be right back IIRC – if I recall correctly IMHO – in my humble opinion LOL – laughing out loud ROTFL – rolling on the floor laughing etc………
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Chat asincron Orientate pe
domeniu Structura
arborescenta(graf)
Reguli(moderatori)
Punct de intalnire pentrucei cu interesecomune
Sursa de informatii valide
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FTP – File Transfer Protocol Metoda eficienta de transmitere a datelor binare (MIME – 66%) Aplicatie client – server fisierele sunt incarcate pe un server care le stocheaza Cont: username:password@server anonymous:adresa_de_email ftp://numecont:[email protected] port tipic: 21
Securitate SSH – Secure Shell SFTP – SSH file transfer protocol SCP – Secure Copy Protocol port tipic: 22
Aplicatii Browser-e WinScp Total Commander
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RSS – Really Simple Syndication Format Web utilizat pentru a face
disponibile utilizatorilor sau altorserver-e informatii frecventmodificate stiri
postari pe forum
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Accesul la fluxurile de date identificarea canalelor
inscrierea la canal (“Subscribe to this feed”)
aplicatie pentru afisarea informatiilor
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P2P – peer to peer Modalitate distribuita extrem de
eficienta de punere in comun si transfer a datelor Datele se gasesc pe calculatoarele client Server-ul mentine o lista de clienti/date Transferul se face direct intre clienti Mai multi clienti simultan
Aplicatii Kaaza Torrent Emule
Direct Connect Notiuni
swarm seed leech
Probleme de legalitate
Server n
Client n
Server 1
Client 1
Client 2
Client 3
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Reţeaua de socializare Facebook transferă maimulte date decât Google in SUA
La nivel mondial, activitatea digitală legată de socializare a depăşit activitatea legată de pornografie (lider incontestat până la aceastadată)
În SUA, 1 din 8 cupluri căsătorite recent s-au cunoscut pe Internet
Facebook are mai mulţi utilizatori decâtpopulaţia multor ţări de pe glob. "Populaţia" Facebook ar plasa această reţea pe poziţia a 3-a, după China şi India.
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Companiile sunt mai interesate de a obţine o imagine bună în reţelele de socializare decâtde a fi plasate în top în Google. Din aceastăcauză au aparut şi meserii care constau înfrecventarea acestor reţele de socializarepentru a influenţa aceste imagini ("postac")
Companiile folosesc din ce in ce mai des retelele de socializare in procesul de recrutare
Wikipedia are peste 15 milioane de articole, şieste considerată la fel de corectă ca Encyclopedia Britannica
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Care retea? Motive? Probleme?
1 subiect la examenul final
obligatoriu frecventarea macar o data a macarunei retele sociale
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Laboratorul de microunde si optoelectronica http://rf-opto.etti.tuiasi.ro [email protected] tema de acasa, curs 6, prezenta obligatorie,
25% din nota