AC1103 Information Technology

1
AC1103Information Technology

• The Internet
• Lecture 1 of 1

2
The Internet

• History
• What is the internet
• Email email etiquette
• The Web
• Browsing
• Searching
• Summary

3
The History

• 1866 - cable

4
The History

• 1866 - cable
• 1957 - ARPANET

5
The History

• 1866 - cable
• 1957 - ARPANET
• 1969 - US government (in case
• of nuclear war)

6
The History

• 1866 - cable
• 1957 - ARPANET
• 1969 - US government (in case
• of nuclear war)
• mid 80s - electronic mail

7
The History

• 1866 - cable
• 1957 - ARPANET
• 1969 - US government (in case
• of nuclear war)
• mid 80s - electronic mail
• Explosion of the World Wide Web

1997
1992
1990
1991
8
The InternetA New Concept in CommunicationandIn
formation Dissemination
9
Service Provider
Service Provider
Service Provider
10
Service User
11
Service User
Service User
12
Service User
Service User
Service User
13
The Internet

• No central computer controlling it
• Self regulating, based on free speech
  unrestricted access to information
• Emergence of E-commerce

14
The Internet
chatrooms
WWW
UsenetNews
Email
...
FTP
Telnet
15
Electronic Mail

• Simple use already - sent received messages
  (using Pegasus Mail)

16
Electronic Mail

• Multiple copies can be sent simultaneously
• Can reply to messages received, or forward mail
  or copy it to others
• Using folders, you can file messages you have
  received appropriately!

17
Electronic Mail - Attachments

• Other files (e.g. word processed documents) can
  be attached to the e-mail message
• Receiver must have appropriate application to
  read attached file
• Large files can cause problems for users with
  limited modem speeds
• Potential danger as attachments may contain
  viruses

18
Electronic Mail

• Typical mail packages let you keep address books
  with e-mail addresses and nicknames
• Distribution lists allow you to send multiple
  copies of a message at a single keypress

19
Potential Problems

• Some email applications code mail in HTML -
  problems for some users
• junk mail

20
Potential Problems

• Email communication is not always as formal as
  written letters, but it is more formal than
  spoken communication.
• Misunderstandings occur and can result in
  flaming, etc.
• Research in department is looking at why people
  get into problems.
• SO........

21
E-mail (n)etiquette

• DO....
• be concise
• check the addressee!
• keep subject titles short but descriptive
• quote from the context when replying

22
E-mail (n)etiquette

• Dont....
• reply in haste
• say things you dont want to be quoted on
• send unsolicited or broadcast messages
• misuse distribution lists
• email if you should rather write / telephone /
  meet
• format the email (e.g. in HTML)

23
E-mail hints and tips

• you can sort stored messages, e.g. alpha-order or
  date order
• delete old messages from time-to-time (take up
  disk space, often in your profile)
• use folders to organise messages you are keeping
• add a signature to your e-mail messages (keep
  it short and un-offensive!)
• join mailing lists these regularly send messages
  about all sorts of topics, e.g. music, ancient
  history, politics

24
The Internet WWW
25
W W W (World Wide Web)

• A graphical, hypertext-based information system
  which provides access to a multitude of Internet
  resources
• Concept was developed in 1989/90

26
Web Pages

• Uses hypertext concept - documents have links to
  other documents (pages) which allows the reader
  to take a unique path between documents

27
(No Transcript)
28
(No Transcript)
29
Web Pages

• Web pages contain text, graphics, sound, video
• Can be interactive, i.e. you can fill in forms

30
Web Pages

• Web pages are written in HTML - HyperText Markup
  Language
• Stored on a network computer as filename.html (or
  .htm)
• Will learn HTML in AC1204

31
WWW Info is stored on ...

• web pages which are collected together into ...
• web sites
• Accessed by URLs, for example
• http//www.dundee.ac.uk

32
What is a URL ?

• Uniform Resource Locator

33
Different ways of accessing a web page

• Type in the URL
• Click on a link
• Click on a bookmark

34
(No Transcript)
35
Home Pages

• Browser home page
• default startup page - you can change it
• Server home page
• default page you come to on a web site
• Personal home page
• information created by and about an individual

36
Surfing the Web
37
Surfing the Web

• Using browser software to exploit the hypertext
  facility, e.g. Netscape, Internet Explorer
• Wander around from place to place
• Or, search for something new

38
Searching the Web

• Search engines, e.g. Altavista, Lycos or Infoseek
• Indexes
• Lists

39
Searching the Web

• Search engines
• automatic
• cover almost entire web
• not context sensitive
• careful choice of search engine and search
  criteria
• can use boolean expressions

40
Searching the Web

• Indexes
• manually compiled
• do not cover entire web
• context sensitive

41
Lets try it
42
Caution

• Information is not always up to date
• May be misleading, always verify information
  (especially if for an essay!)
• CAN spend hours using it - DONT

43
- Netiquette Revisited - Guidelines for
Behaviour on the Network

• Networks make you anonymous
• Brings out unexpected behaviour in some people
• Use common sense and USUAL behaviour
• Be aware of the University policy

44
SUMMARY

• The internet is supports the WWW, email, Usenet
  News, Telnet, FTP...
• Email is versatile
• WWW - hypertext
• navigation
• searching
• Etiquette

45
AC1103 NOTICE SUMMARY

• The database assignment will be marked this week
  (except for Mondays practical class).
• Class exam - 17 January

46
(No Transcript)