computers and society ist 2710 section 006 class #6: 2/13/08

2/13/08 Computers and Society, Class 6 1

Computers and SocietyIST 2710

Section 006

Class #6: 2/13/08

http://www.is.wayne.edu/drbowen/casw08


Assignment 4

• Could not do Question E about file sizes with a formatting factor

• What the formatting size factor is about:o One byte per character (or 2 bytes for

Unicode) is for the text (letters, etc.) onlyo Any formatting (font, font size, bold,

underlined, color, indents, line spacing, spaces before/after paragraph, etc.) is extra – that information must be in the file.


Assignment 4

• What the formatting size factor is about:o Formatting information makes the file largero Formatting information does not take a set

amount of room – it is variableo Formatting size factor is my way of taking this

into accounto Multiply the file size for text only (# characters

× bytes per character) by the formatting size factor to get size with formatting added in


Midterm

• Midterm in two weeks, February 27o Cumulativeo Two hours in class, like two quizzeso Will cover Excel lab next week

• Question-and-Answer Review next week


Staying for Lab

• Two or more labs or assignments behind, must stay during Lab to get 100% attendance credit tonight - 3 labs in, and 2 assignments in. Who must stay:o EVERYONE! (Unless you have turned more

in tonight).


Turning in Work

• Do not staple all of your work togethero If I cannot separate it easily, I will turn it back

for you to separate

• Turn each assignment in separatelyo Each labo Each homework assignmento Each assignment should be stapled


University closing info

All of these:• Wayne State University Newsline :

313-577-1498• Wayne State University main website:

www.wayne.edu• Pipeline• Or sign up for email, text or cell call

o computing.wayne.edu > services > About WSU Broadcast Messaging


Sound in a Computer

• Sound wave:

• Computer microphone captures the wave, then sound board “digitizes” it – measures and stored value at evenly-spaced times

• These arecalled“samples”


Sound in a Computer

• Store all of those samples in a file – how much room does it take? Later.

• Then read the file back, “play” those samples through a speaker, get the sound back again

• Computer makes a good sound editor – can splice, split, join, sample, merge on top of each other, etc.


Sound in a Computer

• How much room:File size in bytes =(length in seconds) × (bytes per sample) × (1 for mono, 2 for stereo) / (compression factor)

• Example: how many bytes does it take to store a 3-second sound at 8,000 samples per second, one byte per sample, mono, with a compression factor of 15?


Privacy – Chapter 5

• Security: keeping hackers away from your information

• Privacy – making sure that only the people you want have access to your private information

• Internet information about youo Loginso Cookieso Information on servers – employers can read it


Internet information

• Packets identify your computer’s IP addresso Cannot identify you further without your ISP’s

cooperation – your ISP can identify youo Unless you sign in somewhereo Web bug – small graphics file to identify

where you are to a third party, by contract

• Protectiono Anonymizero Email encryption


Electronic Profiling

• Collecting a lot of information about you from a lot of sourceso Need a common identifier – SSN is best, so

be careful with it

• Spam – marketing

• Protectiono Do not put email address on a web page, or

be careful if you doo Be cautious with personal information


Online Protection

• Email filtering – sort into folders including junk & phishing

• Opt out

• Properly dispose of hardware


Seeing Files and Folders

• Use either Windows Explorer or My Computer

• If you use My Computer, you must first click “Folders” to see everything, and then it works like Windows Explorer

• Windows Explorer still works slightly better, and that is what I will show you


Using Windows Explorer

• Get and start a laptop• Getting it right in the first place• Folders in the left pane

o Click “+” until you see all of the folders you were supposed to make

o Then click the folder icon the file is supposed to be in, see the file in the right pane

• A file and a folder are different – only files contain information

• THEN – screen shot


Using Windows Explorer

• Get and start a laptop

• Getting it right in the first place

• Check diskette

• Fixing things – NEVER START OVER!o Drag a folder to the right placeo Editing a folder or file nameo Searching – if it is not on your diskette, it is

probably in My Documents


Seeing File Extensions

• Windows Explorer

• Tools > File Extensions

• Hide extensions for known file types

• This also changes whether or not you see file extension in all applications!


Using Calculator for 2n

• Start Windows Calculator

• Scientific View

• Dec clicked

• Click these keys:1. 2

2. x^y

3. n


Getting Lab Startup Files #1

• Added 2/7/08

• Go to the website for all of IST 2710 (different than website just for this section)o Two ways to do this, use either one:

• Go to www.is.wayne.edu/gst2710 (notice g, not i)OR

• Go to class website at www.is.wayne.edu/drbowen/casw08

• Scroll down and right-click on the file you need, then …



• Scroll down and right-click on the file you need, then …

• On the shortcut menu click on “Save Target As…” (Internet Explorer) or “Save Link As… (Firefox) or the link that is most like either of these

• Save the file to your floppy diskette

• Close Browser – you’re done with it

• More on next slide …



• You can now start the Tutorial

• When opening the file, do not use the location (folders) in the Tutorial, but instead use the location (path) that you save the file to.

• Similarly, when saving that or a changed file, save to that same location

• These directions are also on the Lab 5 sheet distributed in class