Coms 161 introduction to computing
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COMS 161 Introduction to Computing. Title: Understanding Information Technology Date: January 17, 2005 Lecture Number: 3. Announcements. Review. Outline. Digital Information Digital Domain. The Digital Environment.

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COMS 161 Introduction to Computing

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Coms 161 introduction to computing

COMS 161Introduction to Computing

Title: Understanding Information Technology

Date: January 17, 2005

Lecture Number: 3


Announcements

Announcements


Review

Review


Outline

Outline

  • Digital Information

  • Digital Domain


The digital environment

The Digital Environment

  • Over the past decade we have been increasingly exposed to digital information in our daily lives

    • What are some examples of digital information?

      • Digital Documents

        • Easier to create, store, transmit and manipulate

      • Digital Numeric Processing

        • Many uses for spreadsheets


The digital environment1

The Digital Environment

  • More examples of digital information

    • Digital Music

      • CDs, MP3s

    • Digital Photography

      • Digital cameras, image manipulation software

    • Digital Graphic Arts

      • Advertisement, movie special effects

    • Digital Television

      • Direct TV, HDTV, TiVo


The digital environment more examples

The Digital EnvironmentMore Examples

  • More examples of digital information

    • Virtual Reality

      • Games, medicine, …

    • Digital Communications

      • Please check your cell phone at the door before class!!

    • The Internet

      • Network backbone


The digital environment more examples1

The Digital EnvironmentMore Examples

  • More examples of digital information

    • The World Wide Web

      • A set of computer systems that follow certain guidelines for storing and presenting information

      • Web site and web pages

    • Browsers

    • Web pages/sites

    • Hypertext

  • Collectively digital information is often referred to as “media”


  • The digital domain

    The Digital Domain

    • In the past

      • Computers were used for numeric computation

    • That was then, but today

      • Computers used for expressing and communicating information

    • Digital Domain

      • Digitized data and the systems that handle it


    The digital domain1

    The Digital Domain

    • Two Essential Components

      • MultimediaInformation

        • The ability of modern desktop computer systems to collect, store, retrieve, display, and generally manage information in a variety of media

        • The integration of various kinds of information


    The digital domain2

    The Digital Domain

    • Two Essential Components(Cont.)

      • NetworkedCommunications

        • Potential for cooperative work using fully interconnected computers and computer networks

        • The interconnection of information in various locations


    The digital domain3

    The Digital Domain

    • Digitizing data

      • Converting raw data to simple numbers

      • An example (using image data)


    The digital domain4

    The Digital Domain

    • Digitizing data

      • Break up the data into small, manageable chunks


    The digital domain5

    The Digital Domain

    • Digitizing data

      • Average the contents of each chunk


    The digital domain6

    The Digital Domain

    • Digitizing data

      • Pick a number to represent the contents of each chunk


    The digital domain7

    The Digital Domain

    • Digitizing data

      • The quality of the digitized picture depends on the size of each chunk


    The digital domain8

    The Digital Domain

    • Once information is converted into digital form, it becomes easy to

      • Store (no matter what kind of information)

      • Copy

      • Combine

      • Modify (edit)

      • Share

      • Transmit

      • Taken without permission


    The digital domain9

    The Digital Domain

    • The Internet

      • Really a very loose collection of networks

      • No single entity controls it

      • Many kinds of information travel around it constantly

        • Email

        • News

        • Entertainment

        • Commerce

        • Etc.


    The digital domain10

    The Digital Domain

    • The Internet

      • No one validates this information

      • No one directly polices this information


    The digital domain11

    The Digital Domain

    • The World Wide Web (WWW)

      • Just a part of the Internet

      • Consists of all the information on the Internet that someone has made available in a particular way

      • Information on your computer can become part of the Web if you configure it as a web server


    The digital domain12

    The Digital Domain

    • Web Browsers

      • Computer programs that make it easy for anyone on the Internet to access information on the Web

      • Many to choose from; they all use common techniques

        • FireFox, Mozilla, Netscape Communicator

        • Internet Explorer

        • Cell Phones and PDAs

        • WebTV, …


    The digital domain13

    The Digital Domain

    • Summary

      • Today’s computer systems are far more than computational and text processing tools

        • Enable a new communication paradigm

        • Information can be digitized and therefore easily manipulated by computers

        • Computers can be networked and therefore information can be easily exchanged


    The digital domain14

    The Digital Domain

    • Summary(Cont.)

      • This paradigm is enhanced by the rapid expansion of the World Wide Web

      • The “Digital Domain” is the convergence of two technologies:

        • Multimedia

        • Networking


    The digital domain15

    The Digital Domain

    • Summary(Cont.)

      • Our lives are increasingly influenced by this easy availability of information

      • It is our responsibility to evaluate the veracity of and the right to use the information we find


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