Score

5 points

August 27,2010 Part 2

Reliability

* Reliability refers to the operation of hardware, the design of software, the accuracy of data or the correspondence of daata with the real world. Data may be unreliable if it is entered incorrectly or if it becomes outdated.

* For example, a medical record that becomes dissociated from the patient it refers to becomes unreliable.

- The thing does what you want time after time without a too noticeable decrease in performance
- The thing is up to date, I.E. not outdated.

Software which have many problems - "Buggy" - Defects


Intergrity

*Integrity refers to correspondence of data with itself, at its creation. Data lacks integrity when it has been changed accidentally or tampered with.

*For example, a hacker might change driver license data resulting in arrests of innocent people.0


Education and training

Use of IT in teaching and Learning

*Education software, online research and forums, virtual learning environments (VLE), e-books, Web 2.0 educational networks, use of mobile devices, game-based learning, fully immersive environments, filtering and monitoring of students' internet use, 1-to-1, m-learning.

* Hardware and network technologies in the classroom
    - Laptop computers, handheld devices, interactive whiteboards.



Old school, New School

The old way of teaching with just some chalk in hand does not keep the attention of students. Having a projector or other such technology, is now standard in classrooms, and not having media such as this in a classroom "is like walking into a desert". Teachers who still use the old method of teaching fee like they are falling behind in the teaching world.

August 27, 2010 Part 1

-Energy costs already exceed hardware costs
-One PC is made from 1.8 tonnes of chemicals
-Computer parts are difficult to recycle

IBM Project Green
-2900 servers
-30 mainframes
-80% saving

Energy efficient coding
-Software coded to save as much power as possible.
-Energy efficient coding could cut down energy usage by 30%.

"The most energy efficient, emission reducing device ever created." CPU

Computers can
-Increase business efficiency
-Enable dematerialization

"Computing has already saved more natural resources that it has consumed"  - Intel

Dematerialzation - Real objects replaced by digital things such as online music store instead of buying CDs

Audit of Technology
\/
Plan
\/
Purchasing strategy
- Laptops instead of PCs
-If PCs, thins clients
-Don't over-specify
-High-efficiency computer

Maintanence
*Set monitors to "low power" mode after inactivity
*Switch off computers and other equipment after hours
*Replace CRT monitors for LCDs

Switching off saves more power than putting things into sleep mode

Data Centres
-Highly efficient servers
-Virtual servers if possible
-Cool only whats needed

Recycling is extremely important in Green Computing and is often forgotten




The Computer's Core: The CPU and Memory

*The CPU: The Real Computer

August 25, 2010 notes

On/Off

1/0

Computer systems are constructed of digital electronics. That means the their electronic circuits can exist in only one of two states, on or off. Most computer electronics use voltage levels to indicate their present state. For example, a transistor with five volts would be considered "on|" while a transistor with no voltage would be considered "off". Not all computer hardware uses voltage hardware CD-ROM zx's, for example use

microscopc dark spots on the surface of the disk to indicate "off", while the ordinary shiny surface is considered "on". Hard disks use magnetism, while computer memory uses electric charges stored in tiny capacitors to indicate "on" or "off".

Information is digital. Digital means that its made up of small, countable digits called digits.

A computers cant digest information unless it is a a bit/binary degit

*Bits as Numbers

         ^Binary Number System

                    -Binary number denotes all numbers with combinaions of two digits.

                    -Decimal numbers are automatically converted in binary number and vice versa.

                    -Binary number processing is completely hidden from the user.


Bits as Codes
*ASCII
         -The most widely used code
         -An abbreviation of American Standard Code for Information Interchange

*Unicode
         -A coding scheme that supports 65,000 unique characters


Bits as Instructions in Programs
* Programs are stored as collections of bits
         -Program instructions are represented in binary notation through the use of codes


Bits, Bytes, and Buzzwords
*Bit-related terminology
          Byte = 8 bits
          Kilobyte(KB) = 1 thousand bytes
          Megabytes(MB) = 1 million bytes
          Gigabytes(GB) = 1 billion bytes
          Terabytes (TB) = 1 trillion bytes


Green Computing
  The manufacture of hardware and software that can have an impact on the environment
         - Energy Star equipment
         - Notebook/Laptop & a solar battery
         - Energy saving features
         - Turn off the computer when you are away
         - Screen Savers don't save energy
         - Print only once
         - Recycle waste