World Wide Web (WWW) It is called a "web" because the interconnections between documents resemble a spider's web. Web searching is an act of looking for information in computer database or network (web).
Categories of Web Searching.
1.Directories- hierarchical representation of hyperlinks.
2.Search engines- allows user to submit a query that consists of a word or phase. Searches the database. Example: Google, Yahoo.
3.Meta-search engines- use of more than one other search engine to complete the search job. Example: Metasearch, Metacrawler and Meta search engine.
4.Yellow pages- white pages allows user to lookup information about individuals. Also can use white page to track down the telephone numbers and email addres. Yellow pages contain information about businesses.
Searching Techniques.
1.Terminology
2.Pattern matching queries- Required keyword: mark with "+" before the keyword
Prohibited keyword: mark with "-" before the keyword
3.Boolean query- query that consist keywords but with logical operators (AND,OR,NOT)
4.Search strategies
5.Search generalization
6.Search specialization
Searching: How does it works?
1.User interface: Allows you to type a query and displays the results.
2.Searcher: The engine searches the database for matching your query.
3.Evaluator: The engine assigns scores to the retrieved information.
4.Gatherer: The component that travels the WEB, and collects information.
5.Indexer: The engine that categorizes the data collected by the gatherer.
Searching Tips.
1.Use different resources to find/search different kinds of information.
2.Use successive query refinement to achieve effective search queries.
3.Think carefully for the keywords typed in the search engine.
4.Use Boolean queries when you need combinations of keywords.
After end of slide Web searching, we've been asked to find topic about "communication model" with pdf at google and send it to elearning UTM. I google "communication model pdf" it easy to find it.
Email Application.
A mail, but is sent electronically across the internet. It also quickly delivered in seconds or minutes.
Advantages & Disadvantages.
Advantages: Convenience, Fast speed, Inexpensive, Printable, Reliable, Global, Generality ( not limited to text, but graphics, programs, even sounds )
Disadvantages: Misdirection, Interception, Forgery, Overload, Funk (spamming), No response (from the receiver).
Email Address
-user@host
Example: noordayana@utm.com
noordayana: username
utm.com: host
-username and host are separated by "@"
Email Server and Client.
Email server- software that can send/receive email from/to other email server.
Email client- software that can transfer email from a local host to a local email server.
Mailbox- an electronic mailbox is a disk file which holds email messages.
Carbon Copy Section (CC)
- send a message to more than one person, all recipients will see the list of email addresses.
Blind Carbon Copy Section (BCC)
- the addresses won't be seen by the recipients
How does email works?
Before the class dismiss, Dr Dayana asked to do flow chart on how email work and send it at elearning UTM.
This is my flow chart on how email work :D
