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7 Νοε 2013 (πριν από 3 χρόνια και 5 μήνες)

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1

CISM1502 LECTURE


Thomas Burns


Asst. Professor, Business
Information Systems

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Computer Field and Job Market


Number One top paying 4 yr. degree is Computer
Science and most Engineering degrees. Many
business degrees are not far behind. Social Science
and humanities majors have a rough time of it!!.



The computer field has a surplus of jobs and not
enough people to fill them and it will be even
more so in the future.



You will be working with computers eventually in
every occupation. Pick your niche or occupation
and specialize in computers. Ex. Geographic Info
Systems.

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Computer Field and Job Market


Programmer


System Analyst


Web Master or Designer


Networking Specialist


Database Specialist


Game Designer


Computer Consultant



Common positions in the field

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INTRODUCTION



Agrarian Society




Industrial Society




Information Society

5

Computer Issues



Information Privacy (identity theft)


Information Accuracy


Hackers and Crackers


Viruses and Worms, Trojan Horses and logic
time bombs


Software Piracy


Computer security: firewalls and Encryption



6

Authorized employees
59%
Unauthorized employees
24%
Hackers 14%
Competitors 3%
Computer Issues

Who commits Cyber crime?




Protect yourself from problems
involving hackers and viruses



Do not open email attachments unless your
certain that they don’t carry a virus


Always be sure that your operating system
has all the up
-
to
-
date patches


Always use encryption for any sensitive
data such as giving out credit card #s over
Internet

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What makes computers so
powerful??


Speed of Circuitry


Memory (storage capacity)

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BINARY STORAGE


8 Bits (electronic impulses) = 1 Byte


1 Byte = 1 character of information


1 Kilobyte = 1,000 bytes


1 Megabyte = 1,000,000 bytes


1 Gigabyte = 1,000,000,000 bytes


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History of Computers


1
st

Generation



(1950s) Vacuum
tubes


2
nd

Generation



(1960s) Transistors,
Assembler language


3
rd

Generation



(1960s) Silicon
chips and higer level languages


4
th

Generation



(1970s)
Microcomputers and VLSI


5
th

Generation



(1990s) Networking,
supercomputers



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A computer is an
electronic device

used to manipulate information
based on a
set of instructions

HARDWARE

SOFTWARE


Central Processing Unit



Input Devices



Output Devices



Secondary Storage


Disk, Tape, Optical


Operating Systems




Application Software



Programming languages

SECONDARY STORAGE



MAGNETIC TAPE




DISK DRIVES




OPTICAL STORAGE

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A computer is an
electronic device

used to manipulate information
based on a
set of instructions

HARDWARE

SOFTWARE


Central Processing Unit



Input Devices



Output Devices



Secondary Storage

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TYPES OF COMPUTERS


MICRO
-
COMPUTER (P.C.)


handheld, laptop (notebook), and desktop


MINI
-
COMPUTER



MAINFRAME COMPUTER



SUPERCOMPUTER

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Distributed Data Processing

(Networking)


WHAT IS A NETWORK


dumb terminal vs. node in a network


WHY IS IT BETTER


much less expensive than purchasing a mainframe or
minicomputer.


distances are no longer a factor
-

more efficiency
(client/server relation)


It matches our interaction more precisely
-

A group of
individuals sharing and collaberating. Not Borgs


The Internet is the largest network in the
world comprised of thousands of
independent networks in academia, military,
government and commercial enterprises
(several hundred thousand networks and
growing). Over 500 million users and
expanding every day by tens of thousands.

Then type in the URL address

(1) (2) (3) (4)

Protocol Host name Path File Name

http:// gc.peachnet.edu /www/tburns/ stu.htm


Otherwise use search engines such as Yahoo,


or even better a meta search engine such as

www.IXQUICK.com


First pick a ISP and a browser such as explorer.



Write HTML
-

Hyper
-
Text Markup
Language
( JAVASCRIPT)


Or use a web developer tools such as
Frontpage or Flash


Submit your page to your ISP. Then submit
it to the major search engines or let the web
-
bots find you.

INTRANET


More and more business networks are going to
Intranets so that they can connect easily with
the Internet and so they can use the same easy
TCP/IP protocol user friendly environment.
Groupware and outside access can be achieved
but firewalls are used for protection of
confidential data.

INTRODUCTION TO
WINDOWS


Everything is stored in files:


.com .exe .gif .jpg .wav .doc .mov


Files are stored in Folders on secondary
storage


You can copy and paste, delete, and rename
files and folders


Windows allows multi
-
tasking