Class Agenda – 09/04/2012
description
Transcript of Class Agenda – 09/04/2012
XPXPXPClass Agenda – 09/04/2012
• Summarize visualization concepts.• Present computer data organization.• Explore files, folders, and libraries in Windows 7.• Discuss how operating system (Windows 7) file
organization relates to a database management system.
• Explain logistics of course including course file placement.
1
XPXPXPTo visualize means…
• To form a mental image of…• To make perceptible to the mind or
imagination.• Visualization is a cognitive activity; when we
visualize we perform a mental process.
2
Information visualization
• Definitions of information visualization related to technology:– The study of how to effectively present information. – The use of computer-supported visual representations of
abstract data to amplify cognition.– The purpose of information visualization is to help people
think by providing different representations of data for differing contexts.
• Information visualization should help:– Speed up understanding and resultant actions.– Encourage innovative ways to think about the data.
3
4
Overall View of Information Visualization
Enhanced understanding
Improved decision making
Define the goal
Know the audience
Identify most important data
Ensure data is accurate and
complete
Properties
Relationships
Comparisons
Anomalies
TrendsAmplify
cognition
Views of Computer Organization
Conceptual• I want to buy music on
iTunes. • I want to see if that shirt is
available in blue in a size medium.
Physical
5
Primary Storage/Main
Memory
Processor
ALU
Secondary Storage/Disk
Data and Programs
6
7
8
How does it work?
Primary Storage/Main
Memory
Processor
ALU
Secondary Storage/Disk
Data and Programs when not being processed
Data and Programs when they are being processed
XPXPXPWhat is an operating system?
• Examples:– Windows– Unix– Mac OS X– IBM z/OS, z/VM, UTS– Unisys OS2200
• Definition: Set of software that manages a computer’s operations.
9
XPXPXPWhat does an operating system do?
• Manage hardware and software resources:– Allocate main memory.– Direct processor activities.– Track all program activities.– Manage network connections.– Allocate secondary storage.– Move data and programs from secondary storage
to main memory and back again.• Manage users (a little…).
10
11
Moving data between primary and secondary storage
Secondary Storage/Disk
Primary storage/main memory
Operating System
MS Excel
Firefox
Diablo III
MS Word
Computer Data Organization Vocabulary
12
Bits
Bytes
Program Files Data Files
Database
Fields
Records
Windows Library: View
Folders
XPXPXPOrganizing Files and Folders
• A file is a collection of bytes that has a name and is stored in a computer.
• A file can store a “program” or “data”• Organize files by storing them in folders• Disks contain folders that hold files
– USB drives– Compact discs (CDs)– Digital video discs (DVDs)– Hard disks
• Each drive is assigned a letter in the Windows operating system
13
XPXPXPUnderstanding the Need for Organizing Files
• Windows (and all other operating systems) organizes folders and files in an hierarchy, or file system– So many files, must have organization method.– Windows stores the folders and important
files it needs to turn on the computer in its root directory; must be able to access them quickly.
• Folders stored within other folders are called subfolders
14
Developing Strategies for Organizing Files
15
XPXPXPDeveloping Strategies for Organizing Files
• Type of disk you use to store files determines how you organize those files
• Storing files on removable media allows you to use simpler organization
• The larger the medium, the more levels of folders you should use
16
XPXPXPExploring Files, Folders, and Libraries
• Windows Explorer and the Computer window show the drives, folders, and files on your computer– Each has a slightly different view
• A folder window displays the files and subfolders in a folder– Divided into two sections, called panes
17
Exploring Files, Folders, and Libraries
18
XPXPXPUsing Libraries and Folders
• When you open Windows Explorer, it shows the contents of the Windows built-in libraries by default
• Libraries display similar types of files together, no matter where they are stored
19
Files in a Folder Window
20
XPXPXPNavigating to Your Data Files
• The file path is a notation that indicates a file’s location on your computerG:\FM\Tutorial\Map.png– G: is the drive name– FM is the top-level folder on drive G– Tutorial is a subfolder in the FM folder– Map.png is the full filename with the file extension
21
XPXPXPNavigating to Your Data Files
22
XPXPXPManaging Folders and Files
• Creating a folder– In the Navigation pane, click the drive or folder in
which you want to create a folder.– Click New folder on the toolbar.– Type a name for the folder, and then press the
Enter key.
23
XPXPXPWorking with Folders and Files• Moving and Copying Files and Folders
– Moving a file removes it from its current location and places it in a new location you specify
– Copying places the file in both locations• Naming and Renaming Files
– Filenames provide important information about the file, including its contents and purpose
• Main part of the filename• File extension
– A filename extension identifies file type and indicates program in which file was created
• Deleting Files and Folders– Recycle Bin is an area on your hard disk that holds deleted files until you
remove them permanently
24
XPXPXP
25
Keeping a copy of all files
• You should have a “backup”, or duplicate copy, of all files– Definitely all data files– All program files that you don’t have available in other
forms (downloads, other media)• Most frequently kept on a removable storage
device.