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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
2/13/08 Computers and Society, Class 6 2
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.
2/13/08 Computers and Society, Class 6 3
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
2/13/08 Computers and Society, Class 6 4
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
2/13/08 Computers and Society, Class 6 5
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).
2/13/08 Computers and Society, Class 6 6
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
2/13/08 Computers and Society, Class 6 7
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
2/13/08 Computers and Society, Class 6 8
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”
2/13/08 Computers and Society, Class 6 9
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.
2/13/08 Computers and Society, Class 6 10
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?
2/13/08 Computers and Society, Class 6 11
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
2/13/08 Computers and Society, Class 6 12
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
2/13/08 Computers and Society, Class 6 13
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
2/13/08 Computers and Society, Class 6 14
Online Protection
• Email filtering – sort into folders including junk & phishing
• Opt out
• Properly dispose of hardware
2/13/08 Computers and Society, Class 6 15
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
2/13/08 Computers and Society, Class 6 16
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
2/13/08 Computers and Society, Class 6 17
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
2/13/08 Computers and Society, Class 6 18
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!
2/13/08 Computers and Society, Class 6 19
Using Calculator for 2n
• Start Windows Calculator
• Scientific View
• Dec clicked
• Click these keys:1. 2
2. x^y
3. n
2/13/08 Computers and Society, Class 6 20
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 …
2/13/08 Computers and Society, Class 6 21
Getting Lab Startup Files #2
• 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 …
2/13/08 Computers and Society, Class 6 22
Getting Lab Startup Files #3
• 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
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