Section 7 J

J. Expert system: systems that have been asked to perform the task of an expert. An expert is an expert because they have special knowledge of something. For a computer to have the knowledge of an expert you must teach them the foundation to be like an expert. This is called a knowledge base. They must also have a rule base(formula) for checking up on certain things. For example a machine is made to look for gold so when it checks for certain minerals the computer must look up certain values to see if the minerals are breaking it. An inference engine is also needed as it searches through the rule base to see what an input means. Hardware must pickup what sort of situation it is and what is needed to cope with it. Software is may be required to see if anything needs to be adhered to.

REMEMBER:
1.Knowledge Base(experts)
2.Rule Base(experts)
3.Inference Engine(technician)
4.Hardware(technician working with expert)
5.Software(technician working with expert)

Types of inputs and outputs for supermarket checkout.

Blog Address: http://kcigcseict2011.blogspot.com just in  case anyone forgot.

Inputs:
Magnetic Strip Reader
Bar Code Scanner
Touch Screen
Keyboard
Electronic Scales
Payment Processor
Chip and pin.

Outputs:
Dot Matrix Printer (One of last still in use, 9 Dots)
POS checkout will print out for later analysis.
Screen is for current analysis.
Alarm is for absolute now analysis.

Expert

1) Knowledge base

2) Rule base (formula)

3) Inference Engine

4) HW (sensors, alarms, screens printer?)

5) SW (interface, buttons)

Processing

Processing is changing.
Central processing unit(CPU) is the processor in the computer.
Computers are continuously changing what comes in, and sends it back out.

Computer modeling

Computer modeling is Simulations. Simulation is formulas and variables, variables are your 'what if?' question.

The immediacy is why computer modeling is important. You can immediately test, reset and edit.

Modelling (Simulating)

Some examples are: Word, it simulates a piece of paper and allows lots of scenarios to be created quickly.
Flight Simulator, models flying around in a plane, can simulate any weather conditions(scenarios).

Computers are used to make models(scenarios)/simulate real life variations. It includes formulas and variables and the variables are the what if questions. Everything can be tested immediately, and you can immediately reset your scenario for something else.(retry)

Section 7

Sensors:

-weather sensors

-heart-rate monitors in hospitals

-fire alarm

-timers used in microwaves, races

1.ADC:

 (analogue digital converters) converts a continuous quantity to a discrete time digital representation.

2.Knowledge Base: what you will be dealing with

Eg.(there is rain)

3.Rule Base(formulas)

Eg.heart rate monitor(DANGER>ALARM)

4.Inference Enigma Alarm(google rule)

5.Hardware?

(monitor etc.)

6. Software

Modelling =simulating =.variables =answering ''what if'' question=

x3 types of processing:(any type of computer work where something goes in and comes out differently)

1. Batch processing.eg.Cheques-pile up cheques and at down time insert the cheques into a machine instead of doing it straight away.
2. Real time processing(happens now).In-Out-In.Anywhere where response is needed (right now) involving pc's for example a nuclear powerplant.

Online processing: down an internet connection with inputs.The processing is done somewhere else not on the computer your currently using. For example when you purchase airline tickets online your using your keyboard to do it however its been completed on a different computer somewhere else.