Fundamental s of computer systems
- Created by: Zoe16
- Created on: 04-04-15 11:47
View mindmap
- Fundamentals of computer systems
- Types of computer systems:
- Control system
- A system that controls machinery rather than produce outputs for users.
- Examples ; part of domestic & personal gadgets
- Dedicated system
- Performs a single function or set of functions.
- Examples; Ticket vending machine at train station
- Embedded system
- systems part of a larger system.
- Advantages
- More devices can be added to system to make it better
- Does task straight away - Real Time
- Economical- designed to do specific task - and only that task only
- Advantages
- Examples; satnavs, cameras, digital watches or even Traffic lights.
- Advantages
- More devices can be added to system to make it better
- Does task straight away - Real Time
- Economical- designed to do specific task - and only that task only
- Advantages
- systems part of a larger system.
- General-purpose System
- (apps) can be loaded on the for various uses
- Designed to perform multiple tasks
- Examples; Desktops, Laptops & Smartphones
- Expert system
- Designed to behave like humans.
- They have a Knowledge Base, an inference base and an interface
- Advantages
- Designed to behave like humans.
- Examples; diagnosis of diseases, Suggesting purchase to consumers
- Disadvantage
- Cannot adapt to changing environments unless data knowledge is changed,
- Lack of common sense &errors in knowledge = wrong decisions made
- Holds lots of info,
- Asks humans questions & Works all the time 24hrs
- Advantages
- Examples; diagnosis of diseases, Suggesting purchase to consumers
- Management information systems
- Bring together information form all parts of an organisation
- Examples; In schools- dealing with online registers or
- Control system
- A computer is an electronic, programmable data processing machine
- System- collection of parts that work together for a purpose
- Reliabilty
- Mistakes can lead to ..
- Down Time=period of time that a system fails to provide or perform its primary function
- Expensive errors
- Data loss & Compromise privacy
- Uses.. with the need for reliabilty
- Aircraft navigation & control
- Railway signalling
- Medical Situations
- Railway signalling
- Aircraft navigation & control
- Data Integrity
- Maintaining accuracy and consistency in data
- Data integrity can be compromised by:
- Human errors
- Errors when data is transferred from one computer to another.
- Software bugs
- Viruses or natura distaters
- Software bugs
- Errors when data is transferred from one computer to another.
- Human errors
- Ways to reduce risks to data:
- Backing up regularly
- Controlling access to data
- Validation rules- prevent invalid data to be input
- Error detections and correction software
- Validation rules- prevent invalid data to be input
- Controlling access to data
- Backing up regularly
- Testing
- Reliability is improve through testing.
- Designed to overcome errors
- Testing can never be complete...
- Very time consuming
- Testing is expensive
- Software is so complex
- Testing is expensive
- Very time consuming
- Mistakes can lead to ..
- Ethnic and Legal issues
- Data Protection
- The intention to protect privacy of individuals when data stored on computers.
- Typical data laws;
- Allowing people to view data held about them.
- Correct info when requested
- Use data without causing damage
- Protect data from unauthorised access
- Only collect data that meets purpose
- Cyber crime is a result from lack of data protection
- Ethical Act- is one that is morally right
- Legal Act- is one that does not break any laws
- Challenges that organisations face for the need for protection
- Data Protection
- Environmental Issues
- Waste
- Computers have to be disposed of.
- They contain toxic materials like: Beryllium, lead & cadmium
- Waste goes to landfills
- Toxic chemicals go into the soil.
- Burning of materials to get valuable materials
- Old computers contain plastics & when burnt =dangerous dioxides
- Reduce Energy use
- Solid state storage uses less energy than the rotating disk drives
- Automatic standby switch
- Setting air condition at optimum level
- Modern screens that use less energy than old monitors.
- Laying out equipment = cooled efficiently
- Benefits of computers to the environment
- Reduces need for transport of goods
- Goods made by robots to a greater degree of accuracy
- More efficient products =last longer &use less energy
- Waste
- Importance of computer systems
- Improved quality
- Robot machinery= more accurate
- Cheaper manufacturing
- Faster access to information
- Better decision making
- New ways of communicating
- SMS
- Cell phone
- Improved quality
- Computer system- collection of hardware and software to work to gather &achieve game task
- Types of computer systems:
Comments
No comments have yet been made